JP5726652B2 - Display system - Google Patents

Description

  The present invention relates to a display system including an optical touch panel device.

  Conventionally, a display system in which a touch panel is attached to a display device is known, and an electronic blackboard is an example of such a display system. Optical touch panels are frequently used for electronic blackboards. The “optical touch panel device” in this specification refers to a coordinate detection area (display screen, input surface) and a horizontal direction (horizontal) below the coordinate detection area, as shown in FIG. Direction), a plurality of phototransistors arranged in the horizontal direction above the coordinate detection area, a plurality of LEDs arranged in the vertical direction (vertical direction) on one side of the coordinate detection area, and the coordinate detection area And a plurality of phototransistors arranged in the vertical direction on the other lateral side.

  In such a touch panel device, the user inputs the designated position by applying a light shielding object (such as a user's finger or a dedicated touch pen) to the position to be designated in the coordinate detection area. . When the light shielding object is applied to the designated position in this way, light from the LED facing the light shielding object is blocked by the light shielding object, and the amount of light received by the photodiode facing the light shielding object is reduced. Then, the coordinate value of the light shielding object is output based on the position of the photodiode where the amount of received light is reduced, and the output coordinate value is recognized as the position designated by the user.

JP 2001-142463 A JP 2008-310500 A JP 2007-89732 A

  However, in a display system equipped with an optical touch panel device, the following problems arise when applying a multi-touch function in which a plurality of users can simultaneously input designated positions.

  In the optical touch panel device, when a part of the light shielding object α and a part of the light shielding object β are aligned on the same horizontal line, the X coordinate value of the light shielding object α and the X of the light shielding object β When the coordinate value is too close and a part of the light shielding object α and a part of the light shielding object β are aligned on the same vertical line, the Y coordinate value of the light shielding object α and the Y of the light shielding object β A situation occurs in which the coordinate value becomes too close. When such a situation occurs, what is originally the X coordinate value of the light shielding object α is misrecognized as the X coordinate value of the light shielding object β, or what is originally the Y coordinate value of the light shielding object α is light shielding. There is a problem in that the Y coordinate value of the object β is erroneously recognized, and an incorrect coordinate value (position information) is output.

  The present invention has been made in view of the above problems, and an object of the present invention is to prevent erroneous position information from being output in a display system to which an optical touch panel is attached and a multi-touch function is applied. To do.

  In order to solve the above problems, a display system of the present invention includes a display device, a plurality of light emitting elements arranged in the vertical direction of the display screen on one side of the display screen in the horizontal direction, A plurality of light receiving elements arranged in the vertical direction on the other side in the horizontal direction of the display screen, a plurality of light emitting elements arranged in the horizontal direction on one side in the vertical direction of the display screen, and the vertical direction of the display screen An optical touch panel device having a plurality of light receiving elements arranged in the horizontal direction on the other side of the direction, a plurality of light receiving elements arranged in the vertical direction, and a plurality of light receiving elements arranged in the horizontal direction A display system comprising: a position information detection unit that detects position information indicating a position of a light shielding object that contacts the display screen based on each received light amount, wherein a certain light shielding object is present in the entire area of the display screen. The display device shows a display indicating that an input permission range for allowing input of position information is limited to a range that does not overlap with the position of another light shielding object in the vertical direction and does not overlap in the horizontal direction. And a display control unit to be performed.

  According to the configuration of the present invention, the input possible range in which position information can be input (designated) by a certain light shielding object does not overlap with the position of the light shielding object different from the light shielding object in the vertical direction, and Display indicating that the range is not limited to overlap in the horizontal direction is performed. Therefore, on the display screen, it is possible to suppress the situation where two or more light-shielding objects are positioned on the same vertical (or horizontal) line, and to prevent erroneous position information from being output. There is an effect.

  The horizontal direction of the display screen means a direction parallel to the horizontal scanning line on the display screen. The vertical direction of the display screen means a direction perpendicular to the horizontal direction of the display screen.

  In the display system of the present invention, the display control unit includes an input permission range that allows input of position information by a certain light shield and an input permission range that permits input of position information by another light shield. The input permission ranges may be displayed on the display device so that they do not overlap with each other and do not overlap in the horizontal direction.

  Furthermore, in the display system of the present invention, the display control unit may be configured such that an input permission range for permitting input of position information by a certain light shielding object does not overlap with the position of another light shielding object in the vertical direction and in the horizontal direction. In order not to overlap each other, each input permission range for each light shielding object is displayed on the display device, and when the position of a certain light shielding object is displaced, if the displaced light shielding object is a displacement light shielding object, the position and displacement of the displacement light shielding object The input permission range of the light shielding object other than the displacement light shielding object is adjusted so that the input permission range corresponding to the light shielding object other than the light shielding object does not overlap in the vertical direction and does not overlap in the horizontal direction. May be.

  Moreover, the display system of this invention WHEREIN: The said display control part may display the said input permission range about each light-shielding object on the said display apparatus with a different display form for every light-shielding object. And the said display control part may display the said input permission range about each light-shielding object on the said display apparatus in a different color for every light-shielding object.

  Further, in the display system according to the present invention, the display control unit may include the first when there is an overlapping range in which a part of the input permission range by the first light shielding object and a part of the input permission range by the second light shielding object overlap. A range other than the overlapping range of the input permitted range by the light shielding object, a range other than the overlapping range of the input permitted range by the second light shielding object, and the overlapping range are displayed on the display device in different colors. You may come to let me.

  Furthermore, in the display system of the present invention, in addition to the above configuration, when the position information detection unit detects the position information of the third light shield after detecting the position information of the third light shield, A partial range that is a part of the input permission range set for an object and includes a position indicated by the detected positional information, and among all the light receiving elements, the partial range and the vertical direction The position information of the third light shield may be detected based on the amount of light received by the light receiving elements that overlap in any one of the horizontal directions.

  According to the display system of the present invention, it is possible to suppress the output of incorrect position information.

It is a block diagram which shows schematic structure of the electronic blackboard system (display system) of this embodiment. (A) is a schematic diagram which shows the touchscreen apparatus contained in the said electronic blackboard system. (B) is a schematic diagram for demonstrating a local scan. It is a schematic diagram which shows an example of the image displayed on a display apparatus in 1 person mode. It is a schematic diagram which shows an example of the image displayed on a display apparatus in 2 person fixed mode. (A) is a schematic diagram which shows the image displayed on the display apparatus before a light-shielding object contacts in 2 person variable mode. (B) is a schematic diagram showing an image displayed on the display device when the first light-shielding object in contact with the drawing area is detected in the two-person variable mode. (C) is a schematic diagram showing an image displayed on the display device when a first light shield and a second light shield in contact with the drawing area are detected in the two-person variable mode. (D) is a schematic diagram for explaining a state where the first drawing area and the second drawing area are set in the two-person variable mode, and the light shielding object in contact with the first drawing area is shifted. . (A) is a schematic diagram showing the position of the second drawing area when the first light shield that contacts the drawing area is located in the lower right part of the drawing area in the two-person variable mode. (B) is a schematic diagram showing the position of the second drawing area when the first light shield that contacts the drawing area is located in the upper right part of the drawing area in the two-person variable mode. (C) is a schematic diagram showing the position of the second drawing area when the first light shield that contacts the drawing area is located in the lower left part of the drawing area in the two-person variable mode. It is a figure for demonstrating an example of the parameter used with an electronic blackboard system. It is the schematic diagram which showed the coordinate value on the display screen of a display apparatus. It is the flowchart which showed the flow of the whole process of PC. 10 is a flowchart showing a subroutine of drawing area information initialization processing (S3, S11) shown in FIG. It is a flowchart which shows the subroutine of the 1st update process (S18) shown in FIG. It is a flowchart which shows the subroutine of the 2nd update process (S17) shown in FIG. It is a flowchart which shows the flow of the whole process of a touchscreen apparatus. It is a flowchart which shows the subroutine of the drawing area information initialization process (S104) shown in FIG. It is a flowchart which shows the subroutine of the 1st update process (S117) shown in FIG. It is a flowchart which shows the subroutine of the 2nd update process (S111) shown in FIG. It is a flowchart which shows the subroutine of the whole scan (S106) shown in FIG. It is a flowchart which shows the subroutine of 1st local scan (S109) shown in FIG. It is a flowchart which shows the subroutine of 2nd local scan (S114) shown in FIG. It is a flowchart which shows the subroutine of the 1st drawing area scan (S110) shown in FIG. It is a flowchart which shows the subroutine of the 2nd drawing area scan (S113) shown in FIG. FIG. 11 is a schematic diagram for explaining a state in which a first drawing area is set in the two-person variable mode and a first light shielding object in contact with the first drawing area is shifted.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing a schematic configuration of the electronic blackboard system (display system) of the present embodiment.

  The electronic blackboard system 10 is a display system that can display (draw) lines and the like on a display device based on a touch operation on the touch panel device.

  As shown in FIG. 1, the electronic blackboard system 10 includes a PC 11, a display device 12, and a touch panel device 13.

  The display device 12 is a large color liquid crystal display device compatible with full high vision. The display device 12 displays an image (video) based on an image signal sent from the PC 11.

  The touch panel device 13 is a device that outputs a coordinate value indicating a position designated (input) by a user on the display screen of the display device 12 by an infrared ray blocking detection method. The infrared cut-off detection method is a kind of optical method described in the background art section. In other words, the infrared cut-off detection method uses the light emitted from the light-emitting element as infrared light in the optical system described above.

  Hereinafter, the touch panel device 13 of the infrared ray blocking detection method will be described in detail with reference to FIG. 1 and FIG.

  1 and 2A, the touch panel device 13 includes a communication unit 131, a central processing unit 132, a light emission control circuit 133, a light reception control circuit 134, an X axis light emitting element 135, and a Y axis light emitting element 136. , An X bearing optical element 137, a Y bearing optical element 138, and a storage unit 139.

  The communication unit 131 is a terminal used for communication with the PC 11. Examples of the communication unit 131 include a USB (Universal Serial Bus) terminal or a RS232-C terminal. That is, the touch panel device 13 and the PC 11 are communicably connected via USB or RS232-C.

  The X-axis light emitting element 135 and the X-bearing optical element 137 are members for detecting the X-axis coordinate value at the position specified by the user on the display screen 140. The user designates (inputs) the position by bringing a light-shielding object (such as a user's finger or a dedicated touch pen) into contact with the position to be designated in the entire display screen 140.

  The X-axis light emitting element 135 is a light emitting diode that emits infrared light, and the X-bearing optical element 137 is a photo that receives infrared light having the same wavelength as the infrared light emitted from the X-axis light emitting element 135. It is a diode.

  Hereinafter, a method of detecting the coordinate value of the X axis by the X axis light emitting element 135 and the X bearing optical element 137 will be described. As shown in FIG. 2A, a plurality of X-bearing optical elements 137 arranged along the horizontal direction of the display screen 140 are provided on one side in the vertical direction of the display screen 140 (upper side of the display screen 140). A plurality of X-axis light emitting elements 135 arranged in the horizontal direction of the display screen 140 are arranged on the other side in the vertical direction of the display screen 140 (below the display screen 140). . The horizontal direction of the display screen 140 means a direction parallel to the horizontal scanning line on the display screen 140, and is a direction parallel to the X axis of the coordinate value detected by the touch panel device 13. Further, the vertical direction of the display screen 140 means a direction perpendicular to the horizontal direction of the display screen 140, and is a direction parallel to the Y axis of the coordinate value detected by the touch panel device 13.

  The X-axis light emitting elements 135 are arranged from near one end of the horizontal side of the display screen 140 to near the other end, and the X-bearing optical element 137 is similarly arranged on the horizontal side of the display screen 140. It is lined up from one end side to the other end side. The number of X-axis light emitting elements 135 and the number of X-bearing optical elements 137 are the same, and each X-axis light emitting element 135 and each X-bearing optical element 137 face each other and are paired. .

  Infrared light emitted from the X-axis light emitting element 135 travels along the surface of the display screen 140 and enters the X-bearing light element 137 that is paired with the X-axis light emitting element 135. Here, as shown in FIG. 2 (a), when a light shield exists between the paired X-axis light emitting element 135 and the X bearing optical element 137, the X bearing is more effective than the case where no light shield exists. The amount of light received by the optical element 137 is reduced. That is, the coordinate value of the X-bearing optical element 137 with a reduced amount of received light (or a representative value of the coordinate values of several X-bearing optical elements 137 with a decreased amount of received light) is treated as the X-axis coordinate value of the light shielding object. be able to. Therefore, the coordinate value of the X axis can be output by referring to the electric signal output from each of the plurality of X bearing optical elements 137.

  The method for detecting the coordinate value of the Y axis for the Y axis light emitting element 136 and the Y bearing optical element 138 is the same as that of the X axis light emitting element 135 and the X bearing optical element 137 described above. However, the Y-bearing optical elements 138 are arranged along the vertical direction of the display screen 140 on one side of the display screen 140 in the horizontal direction, and the Y-axis light emitting elements 136 are displayed on the other side of the display screen 140 in the horizontal direction. They are arranged along the vertical direction of the screen 140.

  The light emission control circuit 133 is a control circuit that turns on and off the X-axis light-emitting element 135 and the Y-axis light-emitting element 136. The light receiving control circuit 134 receives electrical signals output from the X bearing optical element 137 and the Y bearing optical element 138, and determines the received light amounts of the X bearing optical element 137 and the Y bearing optical element 138 based on the electrical signals. This is a circuit that generates received light amount data and sends the received light amount data to the central processing unit 132.

  The central processing unit 132 drives various hardware configured in the touch panel device 13 by performing various calculations based on control commands sent from a control unit 113 (see FIG. 1) of the PC 11 described later. Is an arithmetic circuit that generates the drive signal and transmits the drive signal to each of the hardware. That is, the operation of the hardware configured in the touch panel device 13 and the touch panel device 13 is controlled by the control unit 113 of the PC 11.

  Examples of the central processing unit 132 include a microprocessor, an FPGA (Field Programmable Gate Array), an ASIC (Application Specific Integrated Circuit), or an integrated circuit having an arithmetic function. The FPGA is a programmable integrated circuit (Large Scale Integrated circuit), and the ASIC is an integrated circuit designed and manufactured for a specific application.

  Further, the central processing unit 132 performs arithmetic processing based on signals sent from the respective hardware configured in the touch panel device 13, stores the calculation result in the storage unit 139, and transmits the calculation result to the control unit 113 of the PC 11. The process to do is also performed. For example, the central processing unit (coordinate detection unit) 132 calculates a coordinate value (position information) indicating the position of the light shielding object in contact with the display screen 140 based on the received light amount data transmitted from the light receiving control circuit 134. (Detection).

  The storage unit 139 includes a nonvolatile storage device such as a flash memory and a hard disk, and a volatile storage device such as a RAM (Random Access Memory). The storage unit 139 stores and stores various types of information sent from the PC 11 and various types of information calculated and output by the central processing unit 132.

  Next, the PC 11 will be described. The PC 11 is for controlling operations of the display device 12 and the touch panel device 13, and is a general-purpose personal computer or workstation. As shown in FIG. 1, the PC 11 includes a communication unit 111, an output terminal 112, a control unit 113, and a storage unit 114.

  The communication unit 111 is a terminal for communicating with the touch panel device 13. As an example of the communication unit 111, as with the communication unit 131, a USB (Universal Serial Bus) terminal or an RS232-C terminal may be used.

  The output terminal 112 is a terminal for outputting an image signal (video signal) and various control signals to the display device 12. Examples of the output terminal 112 include a terminal for HDMI (High Definition Multimedia Interface) or a terminal for DVI (Digital Visual Interface). That is, the PC 11 transmits an image signal and various control signals to the display device 12 via HDMI or DVI.

  The control unit 113 is a block that comprehensively controls the operations of the display device 12 and the touch panel device 13 connected to the PC 11. That is, when the control unit 113 transmits various control signals to each of the display device 12 and the touch panel device 13, the display device 12 and the touch panel device 13 perform an operation according to the control signal.

  The control unit 113 is configured by a computer including a CPU (Central Processing Unit) and a memory, for example. Then, the operation control of the display device 12 and the touch panel device 13 is performed by causing a computer to execute a control program. This control program may be in a form that reads and uses what is recorded on a removable medium such as a flash memory, or may be in a form that reads and uses what is installed in a hard disk or the like. In addition, a mode in which the control program is downloaded, installed on a hard disk or the like, and the like can be considered.

  Further, when a coordinate value is sent from the touch panel device 13, the control unit 113 stores the coordinate value in the storage unit 114. Furthermore, the control unit 113 displays (draws) an image indicating a line or the like at a position corresponding to the coordinate value on the display screen of the display device 12 based on the coordinate value sent from the touch panel device 13 ( Function as a drawing unit).

  The storage unit 114 includes a nonvolatile storage device such as a flash memory and a hard disk, and a volatile storage device such as a RAM (Random Access Memory). The contents stored in the nonvolatile storage device include an OS (operating system) program to be executed by the control unit 113, other application programs, and the like in addition to the control program described above. In the present embodiment, various types of information calculated and output by the control unit 113 and various types of information transmitted from the touch panel device 13 are stored and stored in the storage unit 114.

  The electronic blackboard system 10 according to the present embodiment has three processing modes (drawing modes) including a one-person mode, a two-person fixed mode, and a two-person variable mode, and any one of them is always on while the power is on. One processing mode is selected. The electronic blackboard system 10 performs an operation according to the selected processing mode.

  Here, the one-person mode is a processing mode in which only one user uses the display screen. In the two-person fixed mode, two users share and use the display screen, the usable area (drawing area) is determined for each user on the display screen, and each usable area is fixed. Processing mode. The two-person variable mode is a processing mode in which two users use a display screen, a usable area is defined for each user on the display screen, and each usable area varies. That is, the two-person fixed mode and the two-person variable mode correspond to a multi-touch mode in which a plurality of users simultaneously specify positions using the touch panel.

  Hereinafter, processing contents in the one-person mode, the two-person fixed mode, and the two-person variable mode will be described in order.

(Single mode)
First, the single mode will be described below. As shown in FIG. 3, the display device 12 of the electronic blackboard system 10 of the present embodiment displays a one-person mode button 100, a two-person fixed mode button 101, and a two-person variable mode button 102.

  When the control unit 113 of the PC 11 detects that the one-person mode button 100 is pressed, the electronic blackboard system 10 is shifted to the one-person mode. In the present embodiment, since the one-person mode is initially set, when the user turns on the electronic blackboard system 10, the control unit 113 first shifts the electronic blackboard system 10 to the single-person mode. It has become.

  When the electronic blackboard system 10 shifts to the one-person mode, the control unit 113 sets the first drawing area 20 in the entire settable range 350 in the display screen 140 of the display device 12 as shown in FIG. The first drawing area 20 is a range in which an image such as a line is displayed (drawn) at the designated position when the user designates the position by bringing the light shielding object into contact with the display screen 140. is there. Further, the position and the width of the first drawing area 20 in the single mode are constant. The settable range 350 is a range in which a drawing area can be set in the display screen 140 of the display device 12.

  In addition, the control unit 113 causes the display device 12 to display the first drawing area 20 that is a range in which position input is permitted (a position input possible range by the light shielding object). Specifically, the control unit 113 controls the display device 12 so that the background color of the first drawing area 20 in the display screen 140 is displayed in light purple.

  When the first drawing area 20 is set as described above, the control unit 113 causes the touch panel device 13 to perform an entire scan. The whole scan means a process of searching for a light shielding object in contact with the display screen 140 for the entire display screen 140 of the display device 12 based on outputs from all the light receiving elements 137 and 138 of the touch panel device 13. . This entire scan is performed until one light-shielding object in contact with the first drawing area 20 is detected (that is, the entire scan is repeated while there is no light-shielding object in contact with the first drawing area 20).

  When one light shield that contacts the first drawing area 20 is detected by the entire scan, the central processing unit 132 detects (outputs) a coordinate value indicating the position of the light shield that is in contact. Then, as shown in FIG. 3, the control unit 113 draws (displays) an image indicating the line 150 on the display device 12 based on the detected coordinate values.

  In addition, after the first light-shielding object that contacts the first drawing region 20 is detected by the entire scan, the control unit 113 causes the touch panel device 13 to perform the local scan without performing the entire scan. ing.

  Hereinafter, the local scan will be described in detail. For example, when the light shielding object x in contact with the first drawing area 20 moves, the coordinate value of the light shielding object x is calculated based on a certain whole scan, and then the coordinate value of the light shielding object x based on the next scan performed. The amount of movement of the light shielding object x until is calculated is extremely small. Therefore, after one light shielding object x contacting the first drawing region 20 is detected in the entire scan, the entire scan is not repeated, but a local area centered on the position of the light shielding object x detected in the previous scan. What is necessary is just to perform the search process of the light shielding object x only for the range. This process of searching for a light shielding object for only the local range is referred to as a local scan.

  More specifically, as shown in FIG. 2B, a square region having a predetermined length on each side and having a predetermined length on each side is set as a local range 300, as shown in FIG. . The local range 300 is a region that is extremely narrower than the entire area of the display screen 140. In the local scan, not all the X-axis light emitting elements 135 and all the Y-axis light emitting elements 136 are driven, but the X-axis light emission located on the same vertical line as the local range 300 (a line parallel to the Y axis). Only the element 135 and the Y-axis light emitting element 136 located on the same horizontal line (line parallel to the X axis) as the local range 300 are driven, and the other light emitting elements 135 and 136 are not driven. Instead of monitoring the outputs of all the light receiving elements 137 and 138, it is already detected by monitoring only the outputs from the light receiving elements 137 and 138 that are paired with the driven light emitting elements 135 and 136, respectively. The coordinate value of the finished shade a is output. By the above local scan, the processing time for outputting coordinate values can be shortened, and the followability of the drawing process with respect to the user's position designation can be improved.

  Further, in the present embodiment, the entire scanning is performed while no first light shielding object is in contact with the first drawing area 20, but the contact of the first light shielding object a with respect to the first drawing area 20 is detected. Then, the local scan is performed without performing the entire scan. As a result, while the first light shielding object a is in contact with the first drawing area 20, only the range extremely close to the light shielding object a is scanned, so the second light shielding object (light shielding other than the light shielding object a) is scanned. Even if the object comes into contact with the first drawing area 20, the second shade object cannot be detected by the control unit 113 or the central processing unit 132 (theoretically, the local range 300 is not detected). It is conceivable that the light shielding object a and other light shielding objects are in contact with each other. However, since the local range 300 is set in a very narrow range, the light shielding object a and other light shielding objects are in contact with the local range 300. In other words, the local area 300 has two light shielding objects (two dedicated touch pens) although a little space is generated when one light shielding object (for example, a dedicated touch pen) is accommodated. ) Rinai is set to the size).

  Accordingly, in the single mode, when the first light shielding object a starts to contact the first drawing area 20 where the light shielding object is not in contact, the light shielding object a is in contact with the first drawing area 20. Even if the second light shielding object comes into contact with the first drawing area 20, it is not realistic that the second light shielding object is detected by the control unit 113 or the central processing unit 132. The coordinate value of the light shielding object is not output.

  As described above, in the one-person mode, one first drawing area 20 is set on the display screen of the display device 12, and the first drawing area 20 can be drawn with substantially only one light shielding object. It has become. Therefore, the single mode is a mode in which only one user can use the display screen.

(2-person fixed mode)
Next, the two-person fixed mode will be described. When it is detected that the two-person fixing mode button 101 shown in FIG. 3 or 4 is pressed, the control unit 113 shifts the electronic blackboard system 10 to the two-person fixing mode.

  When the electronic blackboard system 10 shifts to the two-person fixed mode, the control unit 113, as shown in FIG. 4, is one side of the settable range 350 of the display device 12 above the center and laterally from the center. The first drawing area 20a is set on the (left side), and the second drawing area 20b is set on the other side (right side) below the center and laterally from the center. Note that the first drawing area 20a and the second drawing area 20b are arranged so as not to overlap each other in the horizontal direction and also to each other in the vertical direction. The first drawing area 20a and the second drawing area 20b in the two-person fixing mode each specify a position such as a line at the designated position when the user designates the position by bringing the light shielding object into contact with the display screen 140. This is a range in which an image is displayed (drawn), and the position and width are constant.

  Then, the control unit 113 causes the display device 12 to perform a display for allowing the user to recognize the first drawing area 20a and the second drawing area 20b that permit the designation (input) of the position. Specifically, in the display screen 140, the control unit 113 displays the background color of the first drawing area 20a in light purple and displays the background color of the second drawing area 20b in light red. The display device 12 is controlled.

  Further, as shown in FIG. 4, the control unit 113 includes a non-drawn range within the settable range 350 on the lower side of the first drawing region 20a and the one side (left side) in the horizontal direction of the second drawing region 20b. And the other side (right side) in the horizontal direction from the second drawing area 20b and the first drawing area 20a is set as a non-drawable range. The control unit 113 controls the display device 12 so that the non-renderable range is displayed with a background color unique to the nonrenderable range in order to allow the user to recognize the unrenderable range that does not permit the designation (input) of the position. To do. Even if the control unit 113 and the central processing unit 132 detect that the light shielding object is in contact with the non-drawable range based on the output from the light receiving elements 137 and 138 during the execution period of the two-person fixed mode, drawing is not possible. A coordinate value indicating the position of the shade in the range is not output, and drawing based on this coordinate value is not performed.

  When the first drawing area 20a, the second drawing area 20b, and the non-drawable range are set, the control unit 113 scans the drawing area for the first drawing area 20a and the drawing for the second drawing area 20b. The area scan is alternately performed.

  Here, the drawing area scan will be described. The drawing area scan means a process of searching for a light shielding object for a target drawing area. In other words, the drawing area scan for the first drawing area 20a means a process of searching for a light shielding object in contact with the first drawing area 20a, and the drawing area scan for the second drawing area 20b is It means a process of searching for a light shielding object that contacts the second drawing area 20b. Specifically, in the drawing area scan, not all the X-axis light emitting elements 135 and all the Y-axis light emitting elements are driven, but the X-axis light emitting elements located on the same vertical line as the drawing area to be scanned. 135 and only the Y-axis light emitting element 136 located on the same horizontal line as the drawing area to be scanned are driven, and the other light emitting elements 135 and 136 are not driven. Instead of monitoring the outputs of all the light receiving elements 137 and 138, by monitoring only the outputs from the light receiving elements 137 and 138 that are paired with each of the driven light emitting elements 135 and 136, scanning is performed. The shader is searched for the drawing area to be processed.

  When the first light blocking object b that contacts the display screen 140 is detected in the first drawing area 20a by the drawing area scan with respect to the first drawing area 20a, the control unit 113 and the central processing unit 132 detect the light blocking object b. As shown in FIG. 4, based on the output coordinate value, an image showing a line is drawn (displayed) in the first drawing area 20a.

  In addition, after the light shielding object b is detected in the first drawing area 20a, the control unit 113 stops the drawing area scan for the first drawing area 20a, and the light shielding object b in the first drawing area 20a is detected. The local scanning is performed, and the drawing area scan for the second drawing area 20b is continued. That is, for the light shielding object b, a local scan and a drawing area scan for the second drawing area 20b are alternately performed (in the case where the light shielding object b is out of the first drawing area 20a, The local scan is stopped, and the drawing area scan for the first drawing area 20a is resumed).

  In addition, the fact that the local scan is performed on the light shielding object b in the first drawing area 20a means that even if the second light shielding object h that contacts the display screen 140 appears in the first drawing area 20a, The fact that the light shielding object h is detected by the control unit 113 or the central processing unit 132 does not actually occur, and the coordinate value of the light shielding object h is not output.

  On the other hand, when the second light shielding object c that contacts the display screen 140 appears in the second drawing area 20b while the light shielding object b is detected in the first drawing area 20a, the control unit 113 and the center The calculation unit 132 detects the position of the second light shield c by drawing area scanning, and outputs the coordinate value of the light shield c. Then, the control unit 113 and the central processing unit 132 draw (display) an image indicating a line in the second drawing area 20b of the display device 12 based on the output coordinate value.

  Then, after the second light shielding object c is detected in the second drawing area 20b, the control unit 113 ends the drawing area scan for the second drawing area 20b and targets the light shielding object c. A local scan will be started. As a result, while the first light shield b is detected in the first drawing area 20a and the second light shield c is detected in the second drawing area 20b, the control unit 113 and The central processing unit 132 alternately performs a local scan for the light shield b and a local scan for the light shield c.

  Since the second drawing area 20b is only subjected to local scanning with respect to the light shielding object c, the light shielding object d is controlled even if the third light shielding object d appears in the second drawing area 20b. The detection by the unit 113 and the central processing unit 132 does not actually occur, and the coordinate value of the light shielding object d is not output.

  As described above, in the two-person fixed mode, the first drawing area 20a and the second drawing area 20b are set on the display screen 140 of the display device 12, and drawing is performed with only one light shielding object on the first drawing area 20a. At the same time, drawing is performed on the second drawing area 20b with only one light shielding object different from the light shielding object in contact with the first drawing area 20a. Therefore, the two-person fixed mode is a mode in which the first user performs drawing in the first drawing area 20a, and at the same time, the second user performs drawing in the second drawing area 20b.

  In the above description, the example in which the first light shielding object contact occurs in the first drawing area 20a and the second light shielding object contact occurs in the second drawing area 20b has been described. The same processing is performed even when the second light shielding object contact occurs in the second drawing area 20b and the second light shielding object contact occurs in the first drawing area 20a. That is, when the contact of the first light shielding object occurs in the second drawing area 20b, the drawing is performed in the second drawing area 20b, and the local scan for the light shielding object in the second drawing area 20b; The drawing area scan for the first drawing area 20a is alternately performed. When the light shielding object comes into contact with the first drawing area 20a, drawing is performed in the first drawing area 20a, and a local scan for the light shielding object in the first drawing area 20a and the second drawing area 20b are targeted. The drawing area scan thus performed is alternately performed.

(2 person variable mode)
Next, the two-person variable mode will be described. When it is detected that the two-person variable mode button 102 shown in any of FIGS. 3 to 5 is pressed, the control unit 113 shifts the electronic blackboard system 10 to the two-person variable mode. .

  When the electronic blackboard system 10 shifts to the two-person variable mode, the control unit 113 sets the entire settable range 350 of the display device 12 as the first drawing area 20c, as shown in FIG. In addition, the control unit 113 causes the display device 12 to display the first drawing area 20c that is a range in which position input is permitted (position input possible range by the light shielding object). Specifically, the control unit 113 controls the display device 12 so that the background color of the first drawing area 20c in the display screen 140 is displayed in light purple.

  In the state shown in FIG. 5A, the control unit 113 causes the touch panel device 13 to perform the entire scan. This whole scan is performed until one light shielding object in contact with the first drawing area 20c is detected (that is, the whole scanning is repeated while there is no light shielding object in contact with the first drawing area 20c).

  When the first light shield e that contacts the first drawing area 20c is detected by the overall scan, the central processing unit 132 outputs a coordinate value indicating the position of the light shield e. And the control part 113 draws (displays) the image which shows a line in the 1st drawing area | region 20c based on the coordinate value of the light-shielding object e.

  In addition, when the light shielding object e that contacts the first drawing area 20c (the first light shielding object that contacts the drawing area) is detected as described above, the control unit 113 detects the range of the first drawing area 20c ( The second drawing area 20d is set in a part of the first drawing area 20c while maintaining the position and width). However, the second drawing region 20d is set in a range that does not overlap the light shielding object e and the horizontal line but does not overlap the light shielding object e and the vertical line.

  Specifically, as illustrated in FIG. 5B, when the light shielding object e is located on the upper left side from the center of the settable range 350, the control unit 113 performs the second operation below the light shielding object e and on the right side. The drawing area 20d is set. In addition, the control unit 113 causes the display device 12 to perform a display that allows the user to recognize a range where the first drawing area 20c and the second drawing area 20d overlap. Specifically, the control unit 113 controls the display device 12 so that the background color in the range where the first drawing area 20c and the second drawing area 20d overlap in the display screen 140 is displayed in light green. . In FIGS. 5 and 6, the area indicated by the mesh line indicates a range where the first drawing area 20 c and the second drawing area 20 d overlap.

  In addition, as illustrated in FIG. 6A, when the light shielding object e is located on the lower right side with respect to the center of the settable range 350, the control unit 113 is located above the light shielding object e and on the left side in the second drawing region 20d. Is set. As shown in FIG. 6B, when the light shielding object e is located on the upper right side from the center of the first drawing area 20c, the control unit 113 places the second drawing area 20d below the light shielding object e and on the left side. It is supposed to be set. As shown in FIG. 6C, when the light shielding object e is located on the lower left side with respect to the center of the first drawing area 20c, the control unit 113 sets the second drawing area 20d above the light shielding object e and on the right side. It is supposed to be.

  Then, when the state shown in FIG. 5B is reached, the control unit 113 performs a local scan for the light shielding object e and a drawing area scan for the second drawing area 20d without performing the entire scan. It is designed to be performed alternately. Therefore, in the range of only the first drawing area 20c (the range that does not overlap with the second drawing area 20d in the entire area of the first drawing area 20c), the light blocking object e and another light blocking object are detected. It doesn't happen realistically.

  Further, in the state shown in FIG. 5B, the user can perform drawing on the entire first drawing area 20c with the light shielding object e. That is, the user can move the light shielding object e anywhere within the first drawing area 20c.

  Then, the control unit 113 sets the position of the shaded object e after the movement so that the second drawing region 20d is always located in a range that does not overlap the shaded object e in the horizontal line and does not overlap in the shaded line e and the vertical line. Accordingly, the width (range) of the second drawing area 20d is adjusted. For example, when the light shield e is shifted to the right side from the position shown in FIG. 5B, the left edge of the second drawing area 20d moves to the right side as shown in FIG. 22, and the second drawing area 20d. The range of is becoming narrower. Further, for example, when the light shielding object e is shifted downward from the position shown in FIG. 5B, the upper edge of the second drawing area 20d moves downward, and the range of the second drawing area 20d is increased. It has become narrower.

  As described above, in the state of FIG. 5B, the local scan for the light shielding object e and the drawing area scan for the second drawing area 20d are alternately performed. When the first light shielding object f appears in the second drawing area 20d, the control unit 113 and the central processing unit 132 detect the position of the second light shielding object f by the drawing area scan, and the light shielding object f Coordinate values are output. Then, the control unit 113 and the central processing unit 132 draw (display) an image indicating a line in the second drawing area 20d of the display device 12 based on the coordinate value of the light shielding object f.

  In addition, as described above, not only the light shielding object e that contacts the first drawing area 20c (the first light shielding object that contacts the display screen 140) but also the light shielding object f (display that contacts the second drawing area 20d). When the second shading object in contact with the screen 140 is detected, the control unit 113 does not overlap the shading object f with the width (range) of the first drawing region 20c in the horizontal line. And limit (reduce) the non-overlapping range in the vertical line.

  Specifically, when the light shield f contacts the second drawing area 20d in the state of FIG. 5B, the control unit 113 moves the lower edge of the first drawing area 20c to the upper side and performs the first drawing. The range of the first drawing area 20c is reduced by moving the right edge of the area 20c to the left side. As a result, as shown in FIG. 5C, the first drawing region 20c is positioned on the upper side and the left side of the light shielding object f, and does not overlap the light shielding object f in the horizontal line. The vertical line is also limited to a non-overlapping range.

  Further, as shown in FIG. 5C, the range of only the second drawing area 20d is generated by reducing the range of the first drawing area 20c. The control unit 113 causes the display device 12 to perform a display that allows the user to recognize a portion including only the second drawing area 20d. Specifically, the control unit 113 controls the display device 12 so that the background color of the display screen 140 that includes only the second drawing area 20d is displayed in light red.

  Further, as shown in FIG. 5C, the control unit 113 draws a range other than the first drawing area 20c and the second drawing area 20d in the settable range 350 that does not permit the designation (input) of the position. Set as impossible range. The control unit 113 controls the display device 12 so that the non-drawable range is displayed with a background color unique to the non-drawable range in order for the user to recognize the non-drawable range.

  In the example shown in FIG. 5C, in the settable range 350, the lower side of the first drawing area 20c and the left side of the second drawing area 20d is set as the non-drawable range, and the right side of the first drawing area 20c and the second side. (2) The upper side of the drawing area 20d is a drawing impossible range. Even if the control unit 113 and the central processing unit 132 detect that the light shielding object is in contact with the non-drawable range based on the output from the light receiving elements 137 and 138 during the execution period of the two-person variable mode, drawing is not possible. A coordinate value indicating the position of the shade in the range is not output, and drawing based on this coordinate value is not performed.

  Then, after detecting not only the light shielding object e that contacts the first drawing area 20c but also the light shielding object f that contacts the second drawing area 20d, the control unit 113 draws the drawing area for the second drawing area 20d. The scan is ended, and a local scan for the light shielding object f is started. Thus, while the light shielding object e that contacts the first drawing area 20c and the light shielding object f that contacts the second drawing area 20d are detected, the control unit 113 and the central processing unit 132 target the light shielding object e. The local scan and the local scan for the light shielding object f are alternately performed.

  When the light shielding object e is out of the first drawing area 20c, the local scanning for the light shielding object e is stopped, and the drawing area scanning for the first drawing area 20c is started. Further, when the light shielding object f deviates from the second drawing area 20d, the local scan for the light shielding object f is stopped, and the drawing area scan for the second drawing area 20d is started. Further, when the light shielding object e is out of the first drawing area 20c and the light shielding object f is out of the second drawing area 20d, the entire scan is resumed.

  Also in the state of FIG. 5C, similarly to the state of FIG. 5B, the control unit 113 does not overlap the light shielding object e in the horizontal line even if the light shielding object e moves. The width (range) of the second drawing area 20d is adjusted according to the position of the shaded object e after the movement so that the second drawing area 20d is always located in a range that does not overlap with the vertical line. (See FIG. 5D).

  Further, in the state of FIG. 5C and FIG. 5D, even if the light shielding object f moves, the light shielding object f does not overlap the horizontal line and does not overlap the light shielding object f and the vertical line. The width (range) of the first drawing area 20c is adjusted according to the position of the shaded object f after movement so that the one drawing area 20c is always located. For example, when the light shield f is shifted to the left, the right edge of the first drawing area 20c moves to the left, and the range of the second drawing area 20d is narrowed. Further, for example, when the light shield f is shifted upward, the lower edge of the first drawing area 20c moves upward, and the range of the first drawing area 20c is narrowed.

  As described above, in the two-person variable mode, the first drawing area 20c and the second drawing area 20d are set on the display screen 140 of the display device 12, and the first drawing area 20c is drawn with one light shielding object. At the same time, the drawing is performed with one light shielding object different from the light shielding object in contact with the first drawing area 20a with respect to the second drawing area 20d. Therefore, also in the two-person variable mode, as in the two-person fixed mode, the first user draws in the first drawing area 20a, and at the same time, the second user draws in the second drawing area 20b. .

  As described above, the electronic blackboard system (display system) 10 according to the present embodiment is a position indicating the position of the light shielding object that contacts the display screen 140 based on the amount of light received by the X bearing optical element 137 and the Y bearing optical element 138. A central processing unit (position information detection unit) 132 for detecting information (coordinate values) is provided. And after the control part (display control part) 113 is input the transition instruction | indication to 2 person fixed mode or 2 person variable mode (multi-touch mode) which detects the positional information on each position of two light-shielding objects, Of the entire area of the display screen 140, a drawing area (inputable range) in which position information of a certain light shielding object can be designated (inputted) does not overlap with the position of another light shielding object in the vertical direction and in the horizontal direction. Display (restriction display) indicating that the range is not overlapped.

  Specifically, in the two-person fixed mode, the restriction display permits a first drawing area (input permission range) 20a in which position information input by the light shield b is permitted, and position information input by the light shield c. This is realized by causing the display device 12 to display the respective drawing areas 20a and 20b so that the second drawing area (input permission range) 20b does not overlap in the vertical direction and does not overlap in the horizontal direction. Is done.

  Further, in the limited display, in the two-person variable mode, the first drawing area (input permission range) 20c in which the input of the position information by the light shielding object e is permitted does not overlap with the position of the light shielding object f in the vertical direction. The second drawing region (input permission range) 20d that does not overlap in the horizontal direction and is allowed to input position information by the light shielding object f does not overlap in the vertical direction with the position of the light shielding object e and the horizontal direction. It implement | achieves by displaying each said drawing area | region 20c * 20d on the display apparatus 12 so that it may not overlap in a direction. Further, in the two-person variable mode, when the light shielding object e is displaced, the position of the displaced light shielding object e and the second drawing region 20d do not overlap in the vertical direction and do not overlap in the horizontal direction. Is displaced, the position of the shaded object f after the displacement and the first drawing area 20c are not overlapped in the vertical direction and in the horizontal direction so that the respective drawing areas 20c and 20d are placed on the display device 12. Display.

  According to this configuration, the input possible range that can be input by a certain light shielding object is set to a range that does not overlap the position of the light shielding object different from the light shielding object in the vertical direction and does not overlap in the horizontal direction. Restricted. Therefore, on the display screen 140, it is possible to suppress the situation where two or more light-shielding objects are positioned on the same line in the vertical direction (or horizontal direction), and to prevent erroneous position information from being output. There is an effect.

  In the embodiment described above, the control unit 113 displays the first drawing area 20a and the second drawing area 20b in different display forms (colors), and the first drawing area 20c and the second drawing area 20d. Are displayed in different display forms (colors) to allow the user to recognize each area.

  Further, in the embodiment described above, there are two drawing areas set in the two-person fixed mode or the two-person variable mode, but even if a mode in which three or more drawing areas are set is introduced. Good. For example, a three-person fixed mode in which a first drawing area, a second drawing area, and a third drawing area are set may be introduced. In the three-person fixed mode, the first drawing area does not overlap the second drawing area and the third drawing area in the vertical line and the horizontal line, and the second drawing area is in the vertical line and the horizontal line. The position of each area is determined so as not to overlap the third drawing area. Further, for example, a three-person variable mode in which a first drawing area, a second drawing area, and a third drawing area are set may be introduced. In the three-person variable mode, the first drawing area does not overlap the light shielding object in contact with the second drawing area and the light shielding object in contact with the third drawing area in the vertical line and the horizontal line, and the second drawing area is in the vertical direction. The light shielding object that contacts the first drawing area in the vertical line and the horizontal line without overlapping the light shielding object that contacts the first drawing area and the light shielding object in contact with the third drawing area in the line and the horizontal line And the position and range of each area | region are adjusted so that it may not overlap with the light-shielding object which contacts a 2nd drawing area | region.

  In an electronic blackboard in which a drawing process based on the first light shield k and a drawing process based on the second light shield j can be performed in a single drawing area, When the light shielding object j comes close, there may occur a situation in which the local scan area of the light shielding object k and the local scan area of the light shielding object j overlap each other. If such a situation occurs, it may not be possible to determine whether the detected coordinate value is the light shielding object k or the light shielding object j, and erroneous detection will occur. On the other hand, in the present embodiment, substantially only one light shielding object can be drawn in a single drawing area, and two light shielding objects do not overlap in the vertical line but in the horizontal line. Since they do not overlap, such a false detection does not occur.

(Example)
Below, an example of the processing flow of the electronic blackboard system 10 of this embodiment is demonstrated.

  FIG. 9 is a flowchart showing the overall flow of processing of the PC 11. FIG. 10 is a flowchart showing a subroutine of the drawing area information initialization process (S3, S11) shown in FIG. FIG. 11 is a flowchart showing a subroutine of the first update process (S18) shown in FIG. FIG. 12 is a flowchart showing a subroutine of the second update process (S17) shown in FIG.

  FIG. 13 is a flowchart showing the overall flow of processing of the touch panel device 13. FIG. 14 is a flowchart showing a subroutine of the drawing area information initialization process (S104) shown in FIG. FIG. 15 is a flowchart showing a subroutine of the first update process (S117) shown in FIG. FIG. 16 is a flowchart showing a subroutine of the second update process (S111) shown in FIG. FIG. 17 is a flowchart showing a subroutine of the entire scan (S106) shown in FIG. FIG. 18 is a flowchart showing a subroutine of the first local scan (S109) shown in FIG. FIG. 19 is a flowchart showing a subroutine of the second local scan (S114) shown in FIG. FIG. 20 is a flowchart showing a subroutine of the first drawing area scan (S110) shown in FIG. FIG. 21 is a flowchart showing a subroutine of the second drawing area scan (S113) shown in FIG.

  First, the types of various parameters used in the flowcharts shown in FIGS. 9 to 21 will be described with reference to FIGS. FIG. 7 is a diagram for explaining an example of parameters used in the electronic blackboard system 10. FIG. 8 is a schematic diagram showing coordinate values on the display screen 140 of the display device 12.

  The detected coordinate value information of (2) in FIG. 7 means the coordinate value output by the touch panel device 13, and the previous detected coordinate value information means the coordinate value output before the coordinate value. The input coordinate value information of (1) in FIG. 7 means a coordinate value sent from the touch panel device 13 to the PC 11, and the previous input coordinate value information is from the touch panel device 13 before the coordinate value. This means the coordinate value sent to the PC 11.

  The drawing mode information of (1) and (2) in FIG. 7 indicates the type of drawing mode (one-person mode, two-person fixed mode, two-person variable mode) set at the present time.

  The drawing area information of (1), (2), and (5) in FIG. 7 indicates the coordinate values, sizes, and positions of the first drawing area and the second drawing area. The first drawing area corresponds to the first drawing areas 20, 20a, and 20c in the above-described embodiment. The second drawing area corresponds to the second drawing areas 20b and 20d in the above-described embodiment. Of the drawing area information, IAreaX1, OAreaX1, IAreaXSz1, OAreaXSz1, IAreaY1, OAreaY1, IAreaYSz1, OAreaYSz1, IAreaX2, OAreaX2, IAreaXSz2, OAreaXSz2, IAreaY2, OAreaYSz2, OAreaYSz, OAreaYSz, OAreaYSz, OAreaYSz , A value derived from DXYz is substituted (see, for example, S36 in FIG. 10).

  Further, the light shield 1 in FIG. 7 (3) means a light shield detected in the first drawing area. The light shielding object 1 corresponds to the light shielding object a, the light shielding object b, and the light shielding object e in the above-described embodiment. Further, the light shielding object 2 in FIG. 7 (3) means a light shielding object detected in the second drawing area. The light shield 2 corresponds to the light shield c and the light shield f in the above-described embodiment.

  As described above, the electronic blackboard system 10 of the present embodiment has a one-person mode, a two-person fixed mode, and a two-person variable mode. First, the processing flow in the single person mode will be described.

(Single-person mode flow)
First, the processing on the PC 11 side in the single-person mode will be described based on FIGS. 9 to 12, and then the processing on the touch panel device 13 side in the single-person mode will be described based on FIGS.

  Since the one-person mode is initially set in the electronic blackboard system 10 of this embodiment, when the electronic blackboard system 10 is turned on, the electronic blackboard system 10 shifts to the one-person mode and is stored in the storage unit 114. 0 is assigned to the current drawing mode information (IDispMode).

  Then, as shown in FIG. 9, the display screen of the display device is initialized (S1), the input coordinate value information stored in the storage unit 114 is initialized (S2), and further stored. The drawing area information stored in the unit 114 is initialized (S3).

  As shown in FIG. 10, in the initialization process of the drawing area information in the single mode (YES in S31), the first drawing area 20 (see FIG. 3) is obtained by performing the substitution shown in S36. Is set. Note that “0xffff” shown in S36 is a value indicating invalidity (the same applies to other locations). Further, light purple is designated as the background color of the first drawing area 20 (S34), and drawing mode information indicating the single mode is notified to the touch panel device 13 (S35).

  After the initialization process shown in S3 of FIG. 9, NO is selected in S4 to S6, and the PC 11 waits for data (detected coordinate value information) sent from the touch panel device 13 (S7). When PC 11 receives the data sent from touch panel device 13 (YES in S7), it substitutes the received data for the input coordinate value information stored in storage unit 114 (S12). If there is data received last time, that data is substituted into the previous input coordinate value information.

  If the input coordinate value information indicates the detection of the light shielding object 1 (YES in S13), the PC 11 confirms that the light shielding object 1 is located in the first drawing area 20 (in S14). YES), the display device 14 is controlled to perform a drawing process based on the shade 1 (S15).

  After S15, since it is the one-person mode, NO in S61 in FIG. 12 is selected in S17, and in the one-person mode, the detection of the shade 2 is virtually impossible, so NO in S19 in FIG. 9 is selected. The Further, NO in S41 in FIG. 11 is selected in S18 in FIG. 9, NO is selected in S4 to S6, and the process returns to S7.

  Next, processing on the touch panel device 13 side in the single-person mode will be described with reference to FIGS.

  As illustrated in FIG. 13, when the touch panel device 13 receives drawing mode information indicating the single mode from the PC 11 (YES in S <b> 101), the touch panel device 13 sets the value of the drawing mode information (ODispMode) stored in the storage unit 139. A value indicating the single mode is set (S102). Further, the touch panel device 13 initializes the detected coordinate value information stored in the storage unit 139 (S103), and performs an initialization process of the drawing area information stored in the storage unit 139 (S104).

  In the initialization process of the drawing area information in the single mode (YES in S121 in FIG. 14), the first drawing area 20 (see FIG. 3) is set by performing the substitution shown in S124.

  After the initialization process of the drawing area information, the process proceeds to S105 shown in FIG. 13, and the touch panel device 13 determines whether or not at least one of the light shielding object 1 and the light shielding object 2 has been detected in the previous time, and is still If not detected, YES is selected in S105, NO is selected in S118, and the entire scan is performed (S106).

  Here, the flow of the entire scan is shown in FIG. In the whole scan, first, 0 is assigned to each of X and Y (S170), and the presence or absence of a light shielding object is determined based on the amount of light received by the Xth X bearing optical element 137 (S172 to S174). In addition, the horizontal light emitting element described in the drawing indicates the X-axis light emitting element 135, and the horizontal light receiving element indicates the X bearing optical element 137.

  If the touch panel device 13 determines that there is no light blocking object (NO in S174), the value of X is incremented by 1 (S181), and while the value of X is less than the number of X-bearing optical elements 137, S172. -S174 and S181 are repeated (YES in S171). If the value of X is equal to or greater than the number of X-bearing optical elements 137 (NO in S171), touch panel device 13 ends the entire scan and proceeds to S107 in FIG. In contrast, if touch panel device 13 determines that there is a light blocking object (YES in S174), it substitutes the value of X for OZaX1 (S175).

  After S175, the touch panel device 13 determines the presence or absence of a light blocking object based on the amount of light received by the Yth Y bearing optical element 138 (S177 to S179). In addition, the vertical light emitting element described in the drawing indicates the Y-axis light emitting element 136, and the vertical light receiving element indicates the Y bearing optical element 138.

  If the touch panel device 13 determines that there is no light blocking object (NO in S179), the Y value is incremented by 1 (S182), and S177 to S179 while the Y value is less than the number of Y bearing optical elements 138. , S182 are repeated (YES in S176). If the value of Y becomes equal to or greater than the number of Y-bearing optical elements 138 (NO in S176), touch panel device 13 ends the entire scan and proceeds to S107 in FIG. In contrast, if touch panel device 13 determines that there is a light shielding object (YES in S179), it substitutes the value of Y into OZaY1 and 1 into OZaF1, and proceeds to S107 in FIG.

  In S107 of FIG. 13, the touch panel device 13 determines whether or not the light shielding object 1 is detected. Then, the entire scan is repeated until the light shielding object 1 is detected (NO in S107).

Then, after the shade 1 is detected (YES in S107), the process proceeds to S111. However, since the mode is the single mode, NO is selected in step S151 in FIG. 16 in S111. In the single mode, the light shielding object 2 cannot be substantially detected, and therefore, NO is selected in step S112 in FIG. The process proceeds to S113. In S113, YES is selected in S262 in FIG. 21, and the process proceeds to S115 in FIG. In S115, the touch panel device 13 corrects the X coordinate value and the Y coordinate value in the detected coordinate value information, and transmits the corrected detected coordinate value information to the PC 11. The correction is performed using the following equation.
X coordinate value after correction = X coordinate value before correction × (resolution of display device / number of X axis light emitting elements 135)
Y coordinate value after correction = Y coordinate value before correction × (resolution of display device / number of Y-axis light emitting elements 136)
If the drawing mode is not changed after S115, the process proceeds to S117 (NO in S116), but NO is selected in S131 in FIG. 15 in S117, and the processes after S105 in FIG. 13 are repeated. If the process after S105 is repeated and the light shielding object 1 has already been detected, NO is selected in S105, YES is selected in S108, and the first local scan is executed ( S109).

  Here, the first local scan is a local scan for the light shield 1. The flow of this first local scan is shown in FIG. In the first local scan, first, substitution processing shown in S191 is performed. The number of peripheral scans in S191 means the number of X-axis light emitting elements (or Y-axis light emitting elements) located on the same vertical line (or horizontal line) as the local range 300.

  After S191, the touch panel device 13 determines the presence / absence of a light shielding object based on the amount of light received by the Xth X-bearing optical element 137 (S193 to S195).

  If the touch panel device 13 determines that there is no light blocking object (NO in S195), the touch panel device 13 increments the value of ct by 1 (S203), and repeats S193 to S195 and S203 while the number of ct is less than the number of peripheral scans ( YES in S192). If the number of ct is equal to or greater than the number of peripheral scans (NO in S192), touch panel device 13 ends the first local scan and proceeds to S111 in FIG. In contrast, if touch panel device 13 determines that there is a light shielding object (YES in S195), it substitutes the value of X into OZaX1 (S196), and proceeds to S197.

  In S197, the touch panel device 13 resets the value of ct to 0, and determines the presence or absence of a light blocking object based on the amount of light received by the Yth Y bearing optical element 138 (S199 to S201). If the touch panel device 13 determines that there is no light blocking object (NO in S201), the touch panel device 13 increments the value of ct by 1 (S204), and repeats S199 to S201, S204 while the number of ct is less than the number of peripheral scans ( YES at S198).

  If touch panel number 13 is equal to or greater than the peripheral scan number (NO in S198), touch panel device 13 ends the first local scan and proceeds to S111 in FIG. In contrast, if touch panel device 13 determines that there is a light shielding object (YES in S201), it substitutes the value of Y into OZaY1 and 1 into OZaF1, and proceeds to S111 in FIG. Then, after shifting to S111, the process shifts to S115, the detected coordinate value information is transmitted to the PC 11, and the processes after S105 are repeated.

  Although the case where the one-person mode is initially set has been described above, the one-person mode is also executed when the one-person mode button 100 shown in FIG. 3 is selected. However, in this case, YES is selected in S4 of FIG. 9, and after passing through S8, initialization processing of drawing area information is performed (S11).

(Two-person fixed mode flow)
Next, the two-person fixed mode will be described. First, processing on the PC 11 side in the two-person fixing mode will be described based on FIGS. 9 to 12, and then processing on the touch panel device 13 side in the two-person fixing mode will be described based on FIGS.

  If the two-person fixed mode button 101 shown in FIG. 3 is selected after the electronic blackboard system 10 is turned on (YES in S5 in FIG. 9), the drawing mode information ( 1 is assigned to (IDispMode) (S9), and initialization processing of the drawing area information stored in the storage unit 114 is performed (S11).

  In the initialization process here, YES is selected in S32 of FIG. 10, and the substitution shown in S37 is performed, whereby the first drawing area 20a and the second drawing area 20b shown in FIG. 4 are set. . Further, a light purple color is designated as the background color of the first drawing area 20a, a light red color is designated as the background color of the second drawing area 20b (S34), and the drawing mode indicating the two-person fixed mode is displayed on the touch panel device 13. Information is notified (S35).

  After the initialization process in S11, the PC 11 waits for data (detected coordinate value information) sent from the touch panel device 13 (S7 in FIG. 9). When PC 11 receives the data sent from touch panel device 13 (YES in S7), it substitutes the received data for the input coordinate value information stored in storage unit 114 (S12). If there is data received last time, that data is substituted into the previous input coordinate value information.

  If the input coordinate value information indicates the detection of the light shielding object 1 (YES in S13), the PC 11 confirms that the light shielding object 1 is located in the first drawing area 20a (YES in S14). ), The display device 14 is controlled to perform a drawing process based on the shade 1 (S15). After S15, since it is the two-person fixed mode, NO is selected in S61 in FIG. 12 in S17, and the process proceeds to S19 in FIG. Also in the case of NO in S13 of FIG. 9 (when the input coordinate value information does not indicate detection of the light shielding object 1), NO is selected in S61 of FIG. 12 in S17, and the process proceeds to S19.

  In S19, when the PC 11 determines that the input coordinate value information indicates detection of the light shielding object 2 (YES in S19), the PC 11 confirms that the light shielding object 2 is located in the second drawing area 20b. Then (YES in S20), the display device 14 is controlled to perform a drawing process based on the light shield 2 (S21). After S21, since it is the two-person fixed mode, NO in S41 in FIG. 11 is selected in S18, and the processes after S4 in FIG. 9 are repeated. Also in the case of NO in S19 (when the input coordinate value information does not indicate detection of the light shielding object 2), NO in S41 of FIG. 11 is selected in S18, and the processes after S4 of FIG. 9 are repeated.

  Next, processing on the side of the touch panel device 13 in the two-person fixed mode will be described based on FIGS.

  As shown in FIG. 13, when touch panel device 13 receives drawing mode information indicating the two-person fixed mode from PC 11 (YES in S101), touch panel device 13 sets the value of drawing mode information (ODispMode) stored in storage unit 139. A value indicating the two-person fixed mode is set (S102). Further, the touch panel device 13 initializes the detected coordinate value information stored in the storage unit 139 (S103), and performs an initialization process of the drawing area information stored in the storage unit 139 (S104).

  In the initialization process of the drawing area information in the two-person fixed mode (YES in S122 in FIG. 14), the first drawing area 20a and the second drawing shown in FIG. 4 are performed by performing substitution as shown in S125. Region 20b is set.

  After the initialization processing of the drawing area information, the process proceeds to S105 in FIG. 13, and the touch panel device 13 determines whether or not at least one of the light shielding object 1 and the light shielding object 2 has been detected in the previous time, and is still detected. If not, YES is selected in S105, YES is selected in S118, NO is further selected in S108, and the first drawing area scan is performed (S110). The first drawing area scan means a drawing area scan in which the first drawing area 20a is a processing target.

  FIG. 20 shows a flow of the first drawing area scan. In the first drawing area scan, first, substitution processing shown in S231 is performed. After S231, touch panel device 13 confirms that the size of first drawing area 20a is set (NO in S232), and ct is smaller than the size of first drawing area 20a in the X-axis direction. After confirming this (YES in S233), the presence / absence of a light shield is determined based on the amount of light received by the Xth X-bearing optical element 137 (S234 to S236).

  If the touch panel device 13 determines that there is no light blocking object (NO in S236), the touch panel device 13 increments the value of ct by 1 (S244), and the number of ct is less than the size of the first drawing area 20a in the X-axis direction. S234 to S236 and S244 are repeated (YES in S233). If the number of ct is equal to or larger than the size of the first drawing area 20a in the X-axis direction (NO in S233), the touch panel device 13 ends the first drawing area scan and proceeds to S111 in FIG. In contrast, if touch panel device 13 determines that there is a light shielding object (YES in S236), it substitutes the value of X into OZaX1 (S237), and proceeds to S238.

  In S238, the touch panel device 13 resets the value of ct to 0. Thereafter, the touch panel device 13 confirms that ct is smaller than the size of the first drawing area 20a in the Y-axis direction (YES in S239), and then based on the amount of light received by the Yth Y bearing optical element 138. The presence / absence of a light shielding object is determined (S240 to S242). When the touch panel device 13 determines that there is no light blocking object (NO in S242), the ct value is incremented by 1 (S255), and the number of ct is less than the size of the first drawing area 20a in the Y-axis direction. S240 to S242 and S255 are repeated (YES in S239).

  If the number of ct is equal to or larger than the size of the first drawing area 20a in the Y-axis direction (NO in S239), the touch panel device 13 ends the first drawing process scan and proceeds to S111 in FIG. In contrast, if the touch panel device 13 determines that there is a light shielding object (YES in S242), the value of Y is substituted into OZaY1, and 1 is substituted into OZaF1, and the process proceeds to S111 in FIG.

  And if it transfers to S111, since it is 2 person fixed mode, NO will be selected in S151 of FIG. 16, and it will transfer to S112 of FIG.

  In S112, the touch panel device 13 determines whether or not the light shield 2 has been detected last time. When the light shielding object 2 is detected last time, the second local scan is performed on the light shielding object 2 (S114). The flow of the second local scan is shown in FIG. The second local scan is different from the first local scan only in that the processing target is not the light shielding object 1 but the light shielding object 2, but the processing content itself is the same as the first local scanning. Therefore, the description of the second local scan is omitted here.

  When it is determined in S112 that the light shielding object 2 has not been detected last time, the touch panel device 13 performs a second drawing area scan (S113). FIG. 21 shows the flow of the second drawing area scan. The second drawing area scan is different from the first drawing area scan in that the processing target is not the first drawing area 20a but the second drawing area 20b, and the process corresponding to S262 is also performed. This is the same as the first drawing area scan. Therefore, the description of the second drawing area scan is omitted here.

  After executing the second drawing area scan of S113 in FIG. 13, the touch panel device 13 proceeds to S115 and transmits the detected coordinate value information to the PC 11. If the drawing mode is not changed after S115, the process proceeds to S117 (NO in S116), but NO is selected in S131 in FIG. 15 in S117, and the processes after S105 in FIG. 13 are repeated. Further, when the processing after S105 is repeated and the light shielding object 1 has already been detected, NO is selected in S105, and YES is selected in S108, so that the first local scan is executed. (S109). On the other hand, when the processing after S105 is repeated and the light shielding object 2 is detected but the light shielding object 1 is not yet detected, NO is selected in S105, and NO is selected in S108. The first drawing area scan is executed (S110).

(Two-person variable mode flow)
Next, the two-person variable mode will be described. First, processing on the PC 11 side in the two-person variable mode will be described based on FIGS. 9 to 12, and then processing on the touch panel device 13 side in the two-person variable mode will be described based on FIGS.

  When the two-person variable mode button 102 shown in FIG. 3 is selected after the electronic blackboard system 10 is turned on (YES in S6 of FIG. 9), the drawing mode information ( 2 is substituted for (IDispMode) (S10), and initialization processing of the drawing area information stored in the storage unit 114 is performed (S11).

  In this initialization process, YES is selected in S33 of FIG. 10, and the substitution shown in S38 of FIG. 10 is performed, so that the first drawing area 20c shown in FIG. 5A is set. . Furthermore, light purple is designated as the background color of the first drawing area 20c (S34), and drawing mode information indicating the two-person variable mode is notified to the touch panel device 13 (S35).

  After the initialization process of S11 of FIG. 9, the PC 11 waits for data (detected coordinate value information) sent from the touch panel device 13 (S7). When PC 11 receives the data sent from touch panel device 13 (YES in S7), it substitutes the received data for the input coordinate value information stored in storage unit 114 (S12). If there is data received last time, that data is substituted into the previous input coordinate value information.

  If the input coordinate value information indicates detection of the light shielding object 1 (YES in S13), the PC 11 confirms that the light shielding object 1 is located in the first drawing area 20c (YES in S14). ), The display device 14 is controlled to perform a drawing process based on the shade 1 (S15). After S15, the second update process shown in FIG. 12 is performed (S17). Also, when the input coordinate value information does not indicate the detection of the light shielding object 1 in S13 (NO in S13), the second update process shown in FIG. 12 is performed (S17).

  Hereinafter, the second update process of FIG. 12 will be described. The second update process means a setting or update process for the second drawing area 20d.

  First, when the light shielding object 1 is detected from the input coordinate value information received this time (NO in S62), the position of the second drawing area 20d is determined according to the position of the light shielding object 1 (S63). ). Specifically, when the light shield 1 is located at the lower right, the second drawing area 20d is set at the upper left as shown in FIG. 6A (NO in S64, YES in S66, S67). When the light shield 1 is located on the upper right, the second drawing area 20d is set to the lower left as shown in FIG. 6B (NO in S64, NO in S66, S68). When the light shield 1 is located at the lower left, the second drawing region 20d is set at the upper right as shown in FIG. 6C (YES in S64, YES in S66, S69). When the light shield 1 is located at the upper left, the second drawing area 20d is set to the lower right as shown in FIG. 5B (YES in S64, NO in S65, S70).

  Then, light purple is set as the background color of the range of only the first drawing area 20c, and light green is set as the background color of the overlapping range of the first drawing area 20c and the second drawing area 20d (S71). The process proceeds to S19 in FIG.

  In FIG. 12, when the light shielding object 1 is not detected in the input coordinate value information received this time and the light shielding object 2 is not detected in the previous input coordinate value information (YES in S62, S72). YES), the substitution process shown in S73 is performed, and as a result, the second drawing area 20d is not set and the process proceeds to S19 in FIG. On the other hand, in FIG. 12, the shade 1 is not detected in the input coordinate value information received this time, but the shade 2 is detected in the previous input coordinate value information (YES in S62). (NO in S72), the substitution process shown in S74 is performed, and the process proceeds to S19 in FIG.

  In S19 of FIG. 9, when the PC 11 determines that the input coordinate value information received this time indicates detection of the light shielding object 2 (YES in S19), the light shielding object 2 is positioned in the second drawing area 20d. (YES in S20), the display device 14 is controlled to perform a drawing process based on the light shield 2 (S21). After S21, the first update process shown in FIG. 11 is performed (S18). In addition, when the input coordinate value information does not indicate the detection of the light shielding object 2 in S19 (NO in S19), the first update process shown in FIG. 11 is performed (S18).

  Hereinafter, the first update process of FIG. 11 will be described. The first update process means a setting or update process for the first drawing area 20c.

  First, when the light shielding object 2 is detected from the current input coordinate value information (NO in S42), the range of the first drawing area 20c is adjusted according to the position of the light shielding object 2 (S43). ). Specifically, when the light shield 2 is positioned at the lower right, the first drawing area 20c is set at the upper left (NO in S44, YES in S46, S47). When the light shield 2 is located at the upper right, the first drawing area 20c is set at the lower left (NO in S44, NO in S46, S48). When the light shield 2 is positioned at the lower left, the first drawing area 20c is set at the upper right (YES in S44, YES in S45, S49). When the light shield 2 is located at the upper left, the first drawing area 20c is set at the lower right (YES in S44, NO in S45, S50).

  Then, light purple is set as the background color of the range of only the first drawing area 20c, and light red is set as the background color of the range of only the second drawing area 20d, and the first drawing area 20c and the second drawing area 20d Light green is set as the background color of the overlapping range (S51), and then the processing from S4 onward in FIG. 9 is repeated.

  In addition, in FIG. 11, when the shade 2 is not detected in the input coordinate value information received this time (YES in S42), the substitution process shown in S52 is performed, and thereafter, after S4 in FIG. The process is repeated.

  Next, processing on the side of the touch panel device 13 in the two-person variable mode will be described based on FIGS.

  As shown in FIG. 13, when touch panel device 13 receives drawing mode information indicating the two-person variable mode from PC 11 (YES in S101), touch panel device 13 sets the value of drawing mode information (ODispMode) stored in storage unit 139. A value indicating the two-person variable mode is set (S102). Further, the touch panel device 13 initializes the detected coordinate value information stored in the storage unit 139 (S103), and performs an initialization process of the drawing area information stored in the storage unit 139 (S104).

  In the initialization process of the drawing area information in the two-person variable mode (YES in S123 of FIG. 14), the first drawing area 20c shown in FIG. 5A is obtained by performing the substitution shown in S126. Is set.

  After the initialization processing of the drawing area information, the process proceeds to S105 in FIG. 13, and the touch panel device 13 determines whether or not at least one of the light shielding object 1 and the light shielding object 2 has been detected in the previous time, and is still detected. If not, YES is selected in S105, NO is selected in S118, and the entire scan is performed (S106). Note that the processing content of the entire scan here is the same as the processing content of the one-person mode and the description thereof is omitted.

  When the entire scan in S106 is performed and the light shielding object 1 is detected (YES in S107), the process proceeds to S111. In S111, the second update process is performed. FIG. 16 shows the flow of the second update process in S111. The second update process of FIG. 16 means the setting or update process of the second drawing area 20d, and is different from the first update process of FIG. 12 in that the same process as S71 of FIG. 12 is not performed. Is the same processing content as the second update processing of FIG. Therefore, the description of the second update process in FIG. 16 is omitted here.

  After the second update process of S111 shown in FIG. 13, the touch panel device 13 determines whether or not the light shield 2 has been detected last time (S112). When the light shielding object 2 has been detected last time, the touch panel device 13 performs a second local scan on the light shielding object 2 (S114).

  Further, when it is determined in S112 that the light shield 2 has not been previously detected in S112 (NO in S112), the touch panel device 13 performs a second drawing area scan (S113). After S113 or S114, the touch panel device 13 proceeds to S115 and transmits the detected coordinate value information to the PC 11. After S115, if there is no change in the drawing mode, the process proceeds to S117 (NO in S116). In S117, the first update process is performed. The flow of the first update process in S117 is shown in FIG. The first update process of FIG. 15 means the setting or update process of the first drawing area 20c, and is different from the first update process of FIG. 11 in that the same process as S51 of FIG. 11 is not performed. Is the same processing content as the first update processing of FIG. Therefore, the description of the first update process in FIG. 15 is omitted here.

  When the first update process of S117 of FIG. 13 is completed, the processes after S105 of FIG. 13 are repeated. Further, when the processing after S105 is repeated and the light shielding object 1 has already been detected, NO is selected in S105, and YES is selected in S108, so that the first local scan is executed. (S109). On the other hand, when the processes after S105 are repeated and the light shielding object 1 and the light shielding object 2 have already been detected, after the first local scan is executed in S109, the process passes through S111 and in S112. YES is selected and the second local scan is executed (S114).

  Finally, the control unit 113 and the central processing unit 132 of the electronic blackboard system 10 described above may be realized by software using a CPU as follows.

  That is, the control unit 113 and the central processing unit 132 are a CPU (central processing unit) that executes instructions of a control program that realizes each function, a ROM (read only memory) that stores the program, and a RAM ( random access memory), a storage device (recording medium) such as a memory for storing the program and various data. An object of the present embodiment is to provide a recording medium in which a program code (execution format program, intermediate code program, source program) of a control program, which is software that realizes the above-described functions, is recorded in a computer-readable manner. This can also be achieved by reading the program code recorded on the recording medium and executing it by the computer (or CPU or MPU).

  Examples of the recording medium include a tape system such as a magnetic tape and a cassette tape, a magnetic disk such as a floppy (registered trademark) disk / hard disk, and an optical disk such as a CD-ROM / MO / MD / DVD / CD-R. Card system such as IC card, IC card (including memory card) / optical card, or semiconductor memory system such as mask ROM / EPROM / EEPROM / flash ROM.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  The present invention can be used in a display system in which an optical touch panel is attached to a display device, and is particularly suitable for an electronic blackboard system.

DESCRIPTION OF SYMBOLS 10 Electronic blackboard system 12 Display apparatus 13 Touch panel apparatus 14 Display apparatus 20 1st drawing area 20a 1st drawing area (input permission range)
20b 2nd drawing area (input permission range)
20c 1st drawing area (input permission range)
20d 2nd drawing area (input permission range)
113 Control unit (display control unit)
132 Central processing unit (position information detection unit)
135 X-axis light emitting device (light emitting device)
136 Y-axis light emitting device (light emitting device)
137 X-bearing optical element (light-receiving element)
138 Y-bearing optical element (light-receiving element)
140 Display screen 300 Local range

Claims (5)

A display device;
A plurality of light emitting elements arranged in the vertical direction of the display screen on one side of the display screen in the horizontal direction, and a plurality of light receiving elements arranged in the vertical direction on the other side of the display screen in the horizontal direction And a plurality of light emitting elements arranged in the horizontal direction on one side in the vertical direction of the display screen, and a plurality of light receiving elements arranged in the horizontal direction on the other side in the vertical direction of the display screen. Touch panel device,
A position for detecting position information indicating the position of the light shielding object in contact with the display screen based on the amount of light received by each of the plurality of light receiving elements arranged in the vertical direction and the plurality of light receiving elements arranged in the horizontal direction. A display system comprising an information detection unit,
Of the entire area of the display screen, a range in which an input permission range that permits input of position information by a certain light shielding object does not overlap with the position of another light shielding object in the vertical direction and does not overlap in the horizontal direction. an indication that the limit and a display control unit for causing the display device to,
The display control unit
Each input permission range for each light shielding object is set so that an input permission range permitting input of position information by a certain light shielding object does not overlap with the position of another light shielding object in the vertical direction and in the horizontal direction. Displaying on the display device;
In the drawing process of the display device, when the position of a certain light shielding object is displaced, if the displaced light shielding object is a displacement light shielding object, the position of the displacement light shielding object and the input permission range corresponding to the light shielding object other than the displacement light shielding object A display system , wherein an input permission range of a light shielding object other than a displacement light shielding object is adjusted so as not to overlap in a vertical direction and to overlap in a horizontal direction . The display system according to claim 1 , wherein the display control unit displays the input permission range for each light shielding object on the display device in a display form different for each light shielding object. The display system according to claim 2 , wherein the display control unit displays the input permission range for each light shielding object on the display device in a different color for each light shielding object. When there is an overlapping range in which a part of the input permission range by the first light shielding object and a part of the input permission range by the second light shielding object overlap, the display control unit includes the input permission range by the first light shielding object. claim 1, wherein the range other than the overlapping range, and the range other than the overlapping range of the input permission range of the second light-shielding material, that is displayed on the display device in the overlapping range and the different colors Display system as described in. When the position information of the third light shielding object is detected next after detecting the position information of the third light shielding object, the position information detection unit is a part of the input permission range set for the third light shielding object. A partial range including the position indicated by the detected position information is set, and among all the light receiving elements, the received light amount of the light receiving element that overlaps with the partial range in either the vertical direction or the horizontal direction is set. based on, the display system according to claim 1, characterized in that is adapted to detect the position information of the third light-blocking object.