JP2904063B2 - Coordinate pointing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device such as a CRT display device which forms a display screen by horizontally and vertically scanning a plane with a light spot.
Calculate the coordinate position on the display screen specified by the person,
The present invention relates to a coordinate pointing device to be transmitted to a computer.

[0001]

2. Description of the Related Art In a CRT display device, a scanning circuit generates a scanning signal to horizontally and vertically scan a fluorescent screen of a cathode ray tube with an electron beam.
The light spot moves to form a display screen. 2. Description of the Related Art Conventionally, a light pen has been known as an instruction device that designates a coordinate position on a display screen of such a CRT display device and gives an instruction to a data processing device (hereinafter, simply referred to as a computer) such as a personal computer or a workstation. ing. This light pen is disclosed in Japanese Patent Application Laid-Open No. 1-175622 and Japanese Patent Application Laid-Open No.
Scanning of an electron beam (light spot) passing through the coordinate position by directly pressing the desired coordinate position on the display screen with the pen point and pressing the desired coordinate position on the display screen. It captures the timing and outputs a coordinate position detection signal. The signal processing circuit calculates the coordinate position on the display screen indicated by the pen tip of the light pen based on the arrival time difference between the coordinate position detection signal and the scanning start signal supplied from the scanning circuit. By the way, a light pen has substantially the same shape as a pen such as a writing instrument, and is also the same in that it is held with three fingers, a thumb, an index finger, and a middle finger. Therefore, the display screen is, for example, a book or a notebook. When facing upward from the plane, it is possible to easily and accurately indicate an arbitrary coordinate position on the display screen.

[0002]

However, as is often seen in a display device connected to a desktop computer, a desired coordinate position on a display screen which stands vertically on a desk is indicated by the tip of a light pen. The operation is an operation in which the wrist is greatly bent and the posture becomes unstable, so that the movement of the hand requires skill and the shoulder is stiff. Further, the conventional light pen is based on the arrival time difference between a coordinate position detection signal output from a pen tip (optical sensor) and a scanning start signal supplied from a scanning circuit, assuming that the pen is incorporated into a display device from the beginning. Therefore, since the coordinate position on the display screen designated by the pen point is calculated, it is difficult to later incorporate the light pen into a display device without the coordinate designation function. Also, for a light-scanning type projector that projects from the front (operator side) of a large screen, even if the pen tip of the light pen points to an arbitrary coordinate position on the display screen, the light scanning light is captured. There was a drawback that you could not do that. In addition, in the conventional light pen, if the transmission distance from the pen tip to the signal processing circuit is different, the arrival of the coordinate position detection signal output from the pen tip (optical sensor) and the scanning start signal supplied from the scanning circuit will not occur. Since an error component due to the length of the transmission distance is added to the time difference, high coordinate position detection accuracy cannot be obtained. For this reason, especially when wireless communication is performed from the light pen (coordinate position detection unit) to the signal processing unit, for example, the transmission distance differs between the upper right position, the lower left position, and the center position on the display screen. Therefore, there has been a problem that wireless means cannot be used for this kind of coordinate detection device.

[0003] The present invention has been made in view of the above circumstances, and is directed to a display device that forms a display screen by horizontally and vertically scanning a plane with a light spot, and particularly to a display screen that stands vertically. Also, it is possible to easily indicate a desired coordinate position, and to provide a coordinate indicating function for indicating a picture or a character displayed on a display screen to a display device which does not incorporate the coordinate indicating function in advance. It is an object of the present invention to provide a coordinate pointing device that can perform the operation.

Further, the present invention also provides a coordinate pointing device capable of pointing a desired coordinate position on a display screen of a light-scanning type projector of a system for projecting from the front (operator side) of a large screen. The purpose is. Furthermore, the present invention provides a coordinate pointing device that can prevent "error components caused by the length of the transmission distance" from being placed on the coordinate position detection signal, and therefore can transmit the coordinate position detection signal wirelessly. It is also intended.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 is provided outside a display device in which a display screen is formed by scanning a plane horizontally and vertically with a light spot. A first pointing optical sensor attached to a predetermined reference point on the display screen with the light receiving surface facing the first light sensor, the first light sensor passing through the reference point Upon sensing the light spot, and the reference position detecting section for outputting a reference position detection signal, a human hand fingertip or instruction
An indicator cap fitted to the tip of the rod , and a second optical sensor attached to the indicator cap , wherein the second optical sensor is located on the display screen indicated by the indicator cap . When a light spot passing through any coordinate position is detected,
A coordinate position detection unit that outputs a coordinate position detection signal, a reference position detection signal output from the reference position detection unit, and a coordinate position detection signal output from the coordinate position detection unit. A signal processing unit for calculating the coordinate position on the display screen from the arrival time difference.

The invention according to claim 2 is used by being externally provided in a front-projection display device of a type in which a display screen formed by scanning a plane horizontally and vertically with a light spot is projected onto a large screen from the front. Coordinate pointing device,
A first optical sensor attached to a reference point projected on the screen at which a predetermined reference point on the display screen is projected, with a light receiving surface facing the reference point; When a light spot passing through the reference point is sensed, a reference position detection unit that outputs a reference position detection signal, an indicator cap that is fitted to the fingertip of a human hand or the tip of an indicator rod , and a back side of the indicator cap A second light sensor attached to the second light sensor, the second light sensor detecting a light spot passing through an arbitrary coordinate position on the display screen indicated on the front surface of the indicating cap, and detecting a coordinate position; A coordinate position detection unit that outputs a signal, a reference position detection signal output from the reference position detection unit and a coordinate position detection signal output from the coordinate position detection unit, and a time difference between arrival times of the two position detection signals. display It is characterized by comprising a signal processing unit for calculating the coordinate position on the surface.

According to a third aspect of the present invention, there is provided a coordinate pointing device externally used for a display device on which a display screen is formed by scanning a plane horizontally and vertically with a light spot. A first optical sensor and a first timing unit attached to the display screen with a light receiving surface facing a predetermined reference point, and when the first optical sensor senses a light spot passing through the reference point, said first counting means, and the reference position detecting section for outputting the reference point passage time of the light spot, instruction is fitted to the tip of a human hand fingertip or fescue key
A cap, a second optical sensor attached to the indicating cap , and second timing means, wherein the second optical sensor comprises:
When a light spot passing through an arbitrary coordinate position on the display screen indicated by the indicating cap is detected, the second spot is detected.
The time counting portion, the coordinate position detecting section for outputting the coordinate position passing time of the light spot, when the start of use, simultaneously with reset means for adjusting the time of the first and second timing means, the reference position The reference point passage time supplied from the detection unit and the reference point passing time supplied from the coordinate position detection unit
A signal processing unit that calculates the coordinate position on the display screen based on the difference from the coordinate position passing time .

[0008] The invention described in claim 4 is based on claim 1,
The coordinate pointing device according to 2 or 3, wherein the signal processing unit places a first optical sensor of the reference position detection unit at a scanning start point in the display screen as a first operation of initializing the device, And a vertical retrace period holding means for holding a measurement result when a substantially vertical retrace period is measured by placing the second optical sensor of the coordinate position detection unit at a scanning end point in the display screen; A horizontal scanning line number setting means for reading an effective horizontal scanning line number for forming a proper display screen.

[0009] The invention according to claim 5 is based on claim 1,
4. The coordinate pointing device according to item 2 or 3, wherein the reference point is set at or near a scanning start point on the display screen.

[0010] The invention according to claim 6 is based on claim 1,
4. The coordinate pointing device according to item 2 or 3, wherein at least one of the reference position detection signal and the coordinate position detection signal is wirelessly transmitted to the signal processing unit.

[0011] The invention according to claim 7 is based on claim 1,
4. The coordinate pointing device according to 2 or 3, wherein at least one of the reference position detection signal and the coordinate position detection signal is a light signal, and the light signal is transmitted to the signal processing unit via an optical fiber. It is characterized by being.

[0012] Further, the invention according to claim 8 is based on claim 1,
4. The coordinate pointing device according to 2 or 3, wherein at least one of the reference position detection signal and the coordinate position detection signal is an optical signal, and the optical signal is wirelessly transmitted to the signal processing unit. It is characterized by having.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. The description will be specifically made using an embodiment. First Embodiment FIG. 1 is an external view showing a use state of a coordinate pointing device according to a first embodiment of the present invention, FIG. 2 is a block diagram showing an electric configuration of the coordinate pointing device, and FIG. FIG. 4 is a signal diagram for explaining the operation of the coordinate pointing device. The coordinate pointing device of this example is, as shown in FIGS. 1 and 2,
The pictures (icons) 12, 12,... Displayed on the display screen 11 of the CRT display device 1 outside the CRT display device 1 in which the coordinate designation function is not incorporated.
And an input device for pointing a character or a character to give an instruction to a computer. The input device detects a light spot (electron beam) passing through a scanning start point which is a reference position on the display screen 11 and outputs a reference position detection signal Sa. The position detecting unit 2 detects a light spot passing through a coordinate position on the display screen 11 specified by the operator, and outputs a coordinate position detection signal Sb. And a signal processing unit 4 for calculating coordinate values of the designated position.

In the CRT display device 1 of this example,
As shown in FIG. 3A, N horizontal scanning lines based on a horizontal scanning signal and a vertical scanning signal for vertically oscillating the horizontal scanning line include:
The display screen 11 is formed by moving the light spot (electron beam) and performing dot-sequential scanning. Here, the sum of the vertical effective scanning period T1 and the vertical blanking period T2 is the generation time of one screen (frame), that is, the frame period T, and the horizontal effective scanning period t1, the horizontal blanking period t2, Is the horizontal scanning period (t1 + t2).

The reference position detecting section 2 includes an optical sensor 2 for detecting a light spot passing through a scanning start point on the display screen 11.
1 and an amplifier 2 for amplifying the output signal of the optical sensor 21
2, a pulse generator 23 which receives an output signal from the amplifier 22 and generates a reference position detection signal (pulse signal) Sa, and a case 24 on which these units 21, 22, 23 are mounted. Reference numeral 24 denotes a configuration in which the light receiving portion of the optical sensor 21 is attached to the position of the scanning start point on the display screen 11 of the CRT display device 1 (upper left corner in FIG. 1) with the light receiving portion facing the phosphor screen. I have. Also,
The coordinate position detection unit 3 is used by being attached to the index finger 31 so that a desired position on the display screen 11 can be indicated by a fingertip, and a finger cap 32 made of a soft resin having a finger insertion unit 32a, When a desired coordinate position on the display screen 11 is pressed (instructed) on the front side of the tip of the finger cap 32, an optical sensor 33 that captures a light spot passing through the pushed (instructed) coordinate position, and an output of the optical sensor 33. An amplifier 34 for amplifying the signal and a pulse generator 35 for receiving the output signal from the amplifier 34 and generating a coordinate position detection signal (pulse signal) Sb are provided. The amplifier 34 and the pulse generator 35 The optical sensor 33 is provided inside or outside a predetermined portion of the finger cap 32, and the light sensor 33 has a light receiving portion facing outward on the front end side of the finger cap 32 corresponding to the fingertip of the index finger 31. In, it is attached.

The signal processing unit 4 includes a reference position detection signal (pulse signal) Sa supplied from the reference position detection unit 2 via a reference position detection signal line, and a coordinate position detection unit 3.
Calculates the X coordinate value and the Y coordinate value of the designated coordinate position based on the coordinate position detection signal (pulse signal) Sb supplied via the coordinate position detection signal line via the X coordinate signal line. And a processor having a hardware configuration or a software configuration for supplying to the computer via the Y coordinate signal line. The flip-flop circuit 41, the T counter 42, the T register 43, the t counter 44, the t register 45, , Selection switch 46 and N register 47
Horizontal cycle calculator 48, horizontal cycle register 49,
X divider 50, quotient Y register 51, remainder X register 5
And 2.

The flip-flop circuit 41 alternately outputs a reference position detection signal (pulse signal) Sa supplied from the reference position detection section 2 via a reference position detection signal line to the reference signal.
It is supplied to the START port and the STOP port of the counter 42. When receiving the reference position detection signal (pulse signal) Sa at the START port, the T counter 42 starts counting in synchronization with the dot clock of the image.
When the reference position detection signal (pulse signal) Sa is supplied at the OP port, the counting is stopped, and the frame period (generation time of one screen (frame)) T is measured (FIG. 3B). The T register 43 stores the frame period T measured by the T counter 42. The t counter 44
The reference position detection signal (pulse) Sa supplied from the reference position detection unit 2 via the reference position detection signal line is START.
When the STOP port receives the coordinate position detection signal (pulse signal) Sb supplied from the coordinate position detection unit 3 via the coordinate position detection signal line, the counting starts in synchronization with the dot clock of the image. By stopping the counting, the scanning time t from the scanning start point on the display screen 11 to the designated coordinate position is measured (FIG. 9B). The t register 45 stores the scanning time t measured by the t counter 44.

The selection switch 46 is a switch for selecting the number N of horizontal scanning lines forming the display screen 11 from a plurality of set values. The selected number N of horizontal scanning lines is set in an N register 47. The number of horizontal scans N takes into account, for example, the number of overscans that differ depending on the model of the CRT display device 1. For example, the representative number of horizontal scans N is stored in advance in a ROM (not shown) or the like. And may be arbitrarily selected. Horizontal cycle calculator 48
Calculates a horizontal scanning period (t1 + t2), which is the sum of the horizontal effective scanning period t1 and the horizontal blanking period t2 (FIG. 7A). Since the horizontal scanning period (t1 + t2) is a value obtained by dividing the frame period T by the number N of horizontal scanning lines, the horizontal period calculator 48 performs an integer division T ￥ N (￥ represents integer division). As a result of this integer division, a decimal part generated by a measurement error is rounded off to obtain a quotient of an integer and passed to the horizontal period register 49. Next, the X divider 50 divides the value of the t register 45 (the scanning time t from the scanning start point to the designated coordinate position) by the value of the horizontal period register 49 to obtain an integer quotient y and a remainder x. And save the quotient y in the quotient Y register 51 and the remainder x in the remainder X register 52. The value x of the remainder X register 52 is passed to the computer via the X coordinate signal line, and the value y of the quotient Y register 51 is passed to the computer via the Y coordinate signal line. .

Next, the operation of this example will be described. First, as a preparation, C which does not incorporate the coordinate designating function
At the position of the scanning start point (upper left corner in FIG. 1) on the display screen 11 of the RT display device, the reference position detection unit 2 is made to face the light receiving unit of the optical sensor 21 to the fluorescent screen using, for example, an adhesive tape. Install with Then, the signal processing unit 4 and the computer are electrically connected via the X coordinate signal line and the Y coordinate signal line. Thereafter, the power is turned on to the entire computer system, and desired application software that requires the coordinate pointing device of this example is started. During the operation of the application software, in the reference position detection unit 2, when the optical sensor 21 detects a light spot passing through the scanning start point of the display screen 11, the pulse generator 23 generates a reference position detection signal (pulse signal) Sa. Then, the signal is supplied to the signal processing unit 4. The operator inserts the index finger 31 into the finger insertion section 32a of the finger cap 32, thereby fitting the coordinate position detecting section 3 to the index finger 31, and using the fingertip of the index finger 31 to a desired icon (coordinate position) on the display screen 11. 12 is pressed (instructed). Since the optical sensor 33 of the coordinate position detecting unit 3 is arranged at the fingertip, the icon (coordinate position) 1 pressed (instructed) by the fingertip by the optical sensor 33 is set.
The light spot passing through 2 is detected. When the light spot is detected, the pulse generator 35 generates a coordinate position detection signal (pulse signal) Sb and supplies it to the signal processing unit 4.
The signal processing unit 4 includes a reference position detection signal (pulse signal) Sa supplied from the reference position detection unit 2 via the reference position detection signal line, and a reference position detection signal 3 from the coordinate position detection unit 3 via the coordinate position detection signal line. Coordinate position detection signal (pulse signal) supplied
The X coordinate value of the designated coordinate position and Y based on Sb
The coordinate value is calculated and supplied to the computer via the X coordinate signal line and the Y coordinate signal line.

According to the above configuration, the coordinate position can be pointed with the fingertip even on the display screen which stands vertically on the desk, so that it is significantly easier and more accurate than the operation of pointing with the pen point. It is. In addition, a display device that does not have a coordinate designating function can be externally installed later, so a coordinate designating function for pointing to an icon or a character displayed on the display screen is provided when necessary. be able to.

Second Embodiment FIG. 4 is an external view showing a use state of a coordinate pointing device according to a second embodiment of the present invention, and FIG. 5 is a block diagram showing an electrical configuration of the coordinate pointing device. . The configuration of the second embodiment is significantly different from that of the first embodiment (FIG. 2) in that the coordinate position detection unit 3A and the signal processing unit 4A are connected by a wire (coordinate position detection signal line). Another point is that they are connected wirelessly. That is, as shown in FIGS. 4 and 5, the coordinate position detection unit 3A of this example includes an optical sensor 33, an amplifier 34, and a pulse generator 35 on a soft resin finger cap 32 having a finger insertion unit 32a. And a transmission circuit 36 and an antenna 36a for modulating the coordinate position detection signal (pulse signal) Sc output from the pulse generator 35 and transmitting it as radio waves are added. Has become.

The signal processing unit 4A in this example includes a reference position detection signal (pulse signal) Sa supplied from the reference position detection unit 2A via a reference position detection signal line, and a wireless signal from the coordinate position detection unit 3A. Calculates the X coordinate value and the Y coordinate value of the designated coordinate position based on the coordinate position detection signal Sc supplied in the step (1), and supplies them to the computer via the X coordinate signal line and the Y coordinate signal line. , A flip-flop circuit 41 and a T counter 42
, T register 43, t counter 44, t register 45, selection switch 46, N register 47, horizontal cycle calculator 48, horizontal cycle register 49, X divider 50, quotient Y register 51 And an extra X register 52, and further include an antenna 53a, and a receiving circuit 53 for receiving and detecting / demodulating the coordinate position detection signal Sc converted into radio waves via the antenna 53a. ing.

According to the structure of the present invention, it is possible to obtain substantially the same effects as in the first embodiment. In addition, since a coordinate position on the display screen 11 can be indicated wirelessly, the trouble of dragging a cable (coordinate position detection signal line) to operate can be avoided. Third Embodiment FIG. 6 is a block diagram showing an electrical configuration of a coordinate pointing device according to a third embodiment of the present invention. The major difference between the coordinate pointing device of the third embodiment and that of the above-described second embodiment (FIG. 5) is that, as shown in FIG. 6, each of the reference position detecting unit 2B and the coordinate position detecting unit 3B is provided. With the addition of the timers 25 and 37 at the subsequent stage of the pulse generators 23 and 35, and the provision of a signal distributor 41B in the signal processing unit 4B instead of the flip-flop circuit 41, , T counter 42, t counter 4
4, the T difference counter 42B, the t difference counter 44B
Is provided. The above timers 25 and 37
, Operates at the same time as the dot clock of the image after being initialized at the same time using a switch or the like (not shown) at the start of use. Here, as means for initializing the two timers 25 and 37 at the same time, for example, an optical switch that is reset when receiving light can be considered. Timer 2
5 and 37 each have the number of digits enough to uniquely determine a dot on the display screen 11, and the timers 25 and 37 output the reference position detection signal (pulse signal) S from the pulse generators 23 and 35.
a, given a coordinate position detection signal (pulse signal) Sb,
It is configured to output the time data (the light spot reference position passing time data and the light spot coordinate position passing time data) given the detection signals Sa and Sb.

Next, in the signal processing unit 4B, the signal distributor 41B converts the reference spot passage time data of the light spot supplied from the timer 25 of the reference position detection unit 2B via the reference position detection signal line into the signal. The data is alternately supplied to the B1 port and the B2 port of the T difference counter 42B. T difference counter 4
2B receives the supply of the reference position passing time data of the light spot at the B1 port from the signal distributor 41B.
When the light spot reference position passing time data is supplied from the signal distributor 41B to the B2 port at the B2 port, this is set as a second value B2, and the second value B2 is changed to the first value B1. The frame period T is obtained by subtracting B1 and stored in the T register 43. When the t difference counter 44B receives the reference position passing time data of the light spot supplied from the reference position detection unit 2B via the reference position detection signal line at the B port, the t difference counter 44B saves the data as a first value B, and thereafter, When the coordinate position passing time data of the light spot radiated as a radio wave by the transmitting circuit 36 of the coordinate position detecting unit 3B and received and demodulated by the receiving circuit 53 of the signal processing unit 4B is received at the A port, this is transmitted to the second value A. The scanning time t is obtained by subtracting the first value B from the second value A, and is stored in the t register 45. Since the subsequent operations are substantially the same as those described in the first embodiment, in FIG. 6, the components shown in FIG.
The same components are denoted by the same reference numerals and description thereof will be omitted.

According to the structure of the present invention, substantially the same effects as those of the first and second embodiments can be obtained. In addition, timers 25 and 37 are provided in the reference position detector 2B and the coordinate position detector 3B, and the signal distributor 41 is provided in the signal processor 4B.
Since the B and T difference counter 42B and the t difference counter 44B are provided, even if the coordinate position detection signal is transmitted wirelessly, there is no influence of a signal delay or the like due to the length of the transmission distance, and therefore, a high coordinate can be obtained. Position detection accuracy can be obtained.

Fourth Embodiment FIG. 7 is an external view showing a use state of a coordinate pointing device according to a fourth embodiment of the present invention, and FIG. 8 is a block diagram showing an electrical configuration of the coordinate pointing device. . The coordinate pointing device according to the fourth embodiment is applied to a front-projection display device of a type that projects from the front of a large screen 6, and a reference position detecting unit 2C sets a light-receiving surface of an optical sensor 21 in front (projection). (The machine side). In use, instead of fitting the pointing cap 32C of the coordinate position detecting section 3C to the index finger 31, it is attached to the tip of the explanation pointing rod 7, and the optical sensor 33 is attached from the front of the large screen 6 displaying the display screen 61. The light scan is captured toward the projector. In the configuration of the coordinate pointing device of this example, the reference position detection unit 2C and the coordinate position detection unit 3C
After the respective pulse generators 23 and 35, a timer 2
5 and 37 are added, and the signal distributor 41 is added to the signal processor 4C.
It is the same as the third embodiment (FIG. 6) in that a B and T difference counter 42B and a t difference counter 44B are provided.
The third embodiment differs from the third embodiment in that the coordinate position detection unit 3C and the signal processing unit 4C are connected by cables (reference position detection signal lines, coordinate position detection signal lines) instead of being connected wirelessly.

According to the configuration of the fourth embodiment, the predetermined coordinate position on the display screen 61 displayed on the large screen 6 is determined by the instruction pointing rod 7 having the coordinate position detecting section 3C attached to the tip. If the light sensor 33 of the position detection unit 3C is directed toward the projector and is pointed to, the light scanning can be captured, so that the projection is performed from the front of the large screen 6 (the operator side). A coordinate pointing device using an optical sensor can be applied to an optical scanning projector. In addition, timers 25 and 37 are provided in the reference position detection unit 2C and the coordinate position detection unit 3C, and the signal distribution unit 41B, the T difference counter 42B, and the t difference counter 44 are provided in the signal processing unit 4C.
B is provided, so that no matter what point on the display screen 61 projected on the large screen 6 is pointed by the explanation indicating rod 7, the influence of signal delay or the like due to the length of the transmission distance does not occur, and a high coordinate position is obtained. Detection accuracy can be obtained.

Fifth Embodiment FIG. 9 is a block diagram showing an electric configuration of a coordinate pointing device according to a fifth embodiment of the present invention. The configuration of the fifth embodiment is significantly different from that of the third embodiment (FIG. 6) in that the coordinate position detection unit 3D and the signal processing unit 4D are connected by an optical fiber 8 instead of being connected wirelessly. It is the point which did so. That is, the coordinate position detector 3 of this example
D, as shown in FIG. 9, a soft resin finger cap 32 having a finger insertion portion 32a, an optical sensor 33 and an amplifier 3
4, a pulse generator 35, and a timer 37 internally or externally, and further outputs the coordinate position passing time data of the light spot output from the timer 37 as an optical signal (pulse light) Sd. And a light emitting circuit 36D. The light emitting circuit 36D includes a light emitting diode or the like, and the output optical signal Sd is transmitted to the signal processing unit 4D via the optical fiber 8.

The signal processing section 4D has a light receiving circuit 53D instead of the receiving circuit 53 (FIG. 6). The light receiving circuit 53D includes a phototransistor and the like, and an optical signal (coordinate position passing time data of a light spot) S supplied from the coordinate position detecting unit 3D via the optical fiber 8.
d is electric signal (coordinate position passing time data of light spot)
Convert to The T difference counter 42B includes a signal distributor 41B.
First, when the supply of the reference position passing time data of the light spot is received at the B1 port, the data is held as the first value B1,
Next, when the reference position passing time data of the light spot is supplied from the signal distributor 41B at the B2 port, the data is set as a second value B2, and the first value B1 is subtracted from the second value B2 to obtain a frame period T. And store it in the T register 43. When the t difference counter 44B receives the reference position passing time data of the light spot supplied from the reference position detection unit 2D via the reference position detection signal line at the B port, the t difference counter 44B stores the data as the first value B, and thereafter, When the electric signal (coordinate position passing time data of the light spot) output from the light receiving circuit 53D is received at the A port, this is set as a second value A, and the first value B is subtracted from the second value A to obtain a scanning time t. Is obtained and stored in the t register 45. Since the subsequent operation is substantially the same as that described in the first embodiment, in FIG. 9, the same components as those shown in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

With the configuration of the fifth embodiment, substantially the same effects as those of the third embodiment can be obtained. Of course, the present invention can be applied to a front projection type display device (FIG. 7) that projects from the front of the large screen 6.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and there are design changes and the like that do not depart from the gist of the present invention. Is also included in the present invention. For example, in the above-described fourth embodiment, the front projection type display device has been described. However, the present invention is not limited to the front projection type display device, but is also applicable to a rear projection type display device of a type that projects from behind a large screen. Applicable. In the fourth embodiment described above, the components of the front projection display device are connected by cables, but the coordinate position detection unit and the signal processing unit may be connected wirelessly. In the above-described embodiment, the case of the progressive scanning method has been described. However, the present invention can be applied to interlaced scanning. The display device is not limited to the CRT display device as long as the display device horizontally and vertically scans a plane with a light spot.

In practice, the vertical retrace period and the horizontal retrace period are not the same in consideration of the number of effective horizontal scan lines. In consideration of this, the signal processing unit sets the optical sensor of the reference position detection unit at the scanning start point in the display screen as the first operation of device initialization, and sets the optical sensor of the coordinate position detection unit as described above. At a scanning end point in the display screen, a substantially vertical blanking period Q is measured, the measurement result is held, and the measurement result is subtracted from the frame period T. The subtraction result (T−Q) is calculated by the effective horizontal scanning number N. When divided, the more accurate horizontal scanning period (t1
+ T2) can be obtained. In addition, the reference position detection unit does not necessarily have to be arranged at the scanning start point, and can arbitrarily set a reference value. Further, in the above-described embodiment, the case where the reference position detection unit is always connected to the signal processing unit via the cable (reference position detection signal line) has been described, but instead of the coordinate position detection unit, or Alternatively, it may be connected wirelessly or with an optical fiber together with the coordinate position detecting unit. Also, instead of optical fiber,
An optical signal may be transmitted wirelessly.

[0033]

As described above, according to the structure of the present invention, the coordinate position can be pointed with the fingertip even on the display screen which stands vertically on the desk. In comparison, it is significantly easier and more accurate.
In addition, a display device that does not have a coordinate designating function can be externally installed later, so a coordinate designating function for pointing to an icon or a character displayed on the display screen is provided when necessary. be able to. According to the third aspect of the present invention, the reference position detecting unit and the coordinate position detecting unit are provided with time counting means whose time is adjusted to each other, and output the reference point passing time and the coordinate position passing time of the light spot. As a result, even if the coordinate position detection signal is transmitted wirelessly, there is no influence of signal delay or the like due to the length of the transmission distance, and therefore, high coordinate position detection accuracy can be obtained. According to the second aspect of the present invention, the predetermined coordinate position on the display screen displayed on the large screen is determined by the second rod of the coordinate position detection unit with the pointing rod having the coordinate position detection unit fitted to the tip. Since the optical sensor can be pointed with the optical sensor facing the projector, a coordinate pointing device using the optical sensor can be used even for an optical scanning type projector that projects from the front of the large screen (operator side). Can be applied.

[0034]

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a use state of a coordinate pointing device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an electrical configuration of the coordinate pointing device.

FIG. 3 is a signal diagram illustrating an operation of the coordinate pointing device.

FIG. 4 is a diagram showing a use state of a coordinate pointing device according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing an electrical configuration of the coordinate pointing device.

FIG. 6 is a block diagram showing an electrical configuration of a coordinate pointing device according to a third embodiment of the present invention.

FIG. 7 is a diagram illustrating a use state of a coordinate pointing device according to a fourth embodiment of the present invention.

FIG. 8 is a block diagram showing an electrical configuration of the coordinate pointing device.

FIG. 9 is a block diagram showing an electrical configuration of a coordinate pointing device according to a fifth embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 CRT display apparatus (display apparatus) 11, 61 Display screen 2, 2A, 2B, 2C, 2D Reference position detection part 21 Optical sensor (first optical sensor) 25 Timer (first time measuring means) 3, 3A, 3B , 3C, 3D coordinate position detecting section 32 finger cap (indicating cap) 32a finger inserting section 32C indicating cap 33 optical sensor (second optical sensor) 36 transmitting circuit 36D light emitting circuit 37 timer (second time measuring means) 4, 4A , 4B, 4C, 4D signal processing unit 42 T counter 43 T register 44 t counter 45 t register 46 selection switch 47 N register 53 receiving circuit 53D light receiving circuit 41B signal distributor 42B T difference counter 44B t difference counter Sa Reference position detection Signal Sb Coordinate position detection signal 6 Large screen 7 Explanation pointer (pointer)

Claims (8)

(57) [Claims] 1. A coordinate pointing device which is externally used for a display device on which a display screen is formed by scanning a plane horizontally and vertically with a light spot, wherein a predetermined reference point on the display screen is provided. A first optical sensor attached to the light receiving surface of the first optical sensor, the first optical sensor detects a light spot passing through the reference point, and outputs a reference position detection signal; An indicator cap that fits on the fingertip of the other hand or the tip of the indicator rod
And a second optical sensor attached to the indicating cap , the second optical sensor sensing a light spot passing through any coordinate position on the display screen indicated by the indicating cap. Then, a coordinate position detection unit that outputs a coordinate position detection signal, a reference position detection signal output from the reference position detection unit, and a coordinate position detection signal output from the coordinate position detection unit are received. A signal processing unit for calculating the coordinate position on a display screen from a difference in arrival time of a signal. 2. A coordinate pointing device which is externally used in a front projection type display device which projects a display screen formed by scanning a plane horizontally and vertically with a light spot onto a large screen from the front. A first optical sensor attached to a reference point projection point on the screen at which a predetermined reference point on the display screen is projected, with a light-receiving surface facing the reference point; When the optical sensor senses a light spot passing through the reference point, a reference position detection unit that outputs a reference position detection signal, an indication cap that is fitted to a fingertip of a human hand or the tip of an indication rod , It has a second light sensor attached to the back side, and when the second light sensor senses a light spot passing through any coordinate position on the display screen indicated on the front surface of the indicating cap, Coordinate position A coordinate position detection unit that outputs an output signal, and a reference position detection signal output from the reference position detection unit and a coordinate position detection signal output from the coordinate position detection unit. And a signal processing unit for calculating the coordinate position on the display screen from the display device. 3. A coordinate pointing device externally used for a display device on which a display screen is formed by scanning a plane horizontally and vertically with a light spot, wherein a predetermined reference point on the display screen is provided. having a first optical sensor and the first counting means attached toward the receiving surface, the light sensor of the first to sense a light spot passing through the reference point, the first time counting means to, A reference position detection unit that outputs the time when the light spot passes through the reference point; and a pointing cap that is fitted to a fingertip of a human hand or the tip of a pointing rod.
And a second optical sensor and second timing means attached to the indicating cap , wherein the second optical sensor is
Upon sensing a light spot passing through the arbitrary coordinate position on the display screen indicated by the indication cap, said second counting means, and the coordinate position detecting unit which outputs the coordinate position passing time of the light spot, At the start of use, a simultaneous reset unit for adjusting the time of the first and second clock units, a reference point passing time supplied from the reference position detection unit,
When passing through the coordinate position supplied from the coordinate position detection unit
A signal processing unit that calculates the coordinate position on the display screen based on a difference from the time . 4. The signal processing unit, as a first operation of device initialization, places a first optical sensor of the reference position detection unit at a scanning start point in the display screen, and controls a position of the coordinate position detection unit. A vertical blanking period holding means for holding a measurement result when the second optical sensor is placed at a scanning end point in the display screen and measuring a substantially vertical blanking period; And a horizontal scanning number setting means for reading the number of horizontal scanning lines.
4. The coordinate pointing device according to 2 or 3. 5. The coordinate pointing device according to claim 1, wherein the reference point is set at or near a scanning start point on the display screen. 6. The wireless communication device according to claim 1, wherein at least one of the reference position detection signal and the coordinate position detection signal is wirelessly transmitted to the signal processing unit. Coordinate indicating device. 7. An optical signal, wherein at least one of the reference position detection signal and the coordinate position detection signal is an optical signal, and the optical signal is transmitted to the signal processing unit via an optical fiber. The coordinate pointing device according to claim 1, 2 or 3, wherein: 8. A method according to claim 1, wherein at least one of the reference position detection signal and the coordinate position detection signal is an optical signal, and the optical signal is wirelessly transmitted to the signal processing unit. The coordinate pointing device according to claim 1, 2 or 3.