JP7375571B2 - Image display device, display control method, and cradle - Google Patents

Description

The present invention relates to an image display device, a display control method, and a cradle.

Some image display devices such as liquid crystal displays have a function for more precise adjustment of display image quality. For example, there are medical monitors for interpreting medical images, and DTP (DeskTop Publishing) monitors for designing publications. In the liquid crystal display disclosed in Non-Patent Document 1, a sensor function for measuring the display characteristics of the display screen is provided in the bezel portion.

https://www3.jvckenwood.com/pro/healthcare_sys/cl-s300/ [Searched on January 6, 2020]

By the way, there is a desire to adjust display image quality on tablet terminals as well. However, when the sensor is provided in the bezel portion, there is a problem that it becomes difficult to reduce the size and weight of the tablet terminal. Furthermore, in order for the sensor to receive display light from the display, it is necessary to provide the sensor on the display screen (display area) of the display. Therefore, there is also a problem that a part of the displayed image cannot be visually recognized.

The present disclosure has been made in view of the above points, and aims to provide a display device, a display control method, and a cradle that can adjust display image quality with a simple configuration.

The image display device according to the present embodiment includes a tablet terminal having a display, a cradle holding the tablet terminal, and a light sensor provided in the cradle and capable of receiving display light from the display. .

The cradle according to this embodiment includes a holding part that holds a tablet terminal, and a light sensor that detects display light from a display of the tablet terminal.

According to the present disclosure, it is an object of the present disclosure to provide an image display device, a display control method, and a cradle that can adjust display image quality with a simple configuration.

1 is a diagram showing the overall configuration of an image display device according to the first embodiment; FIG. FIG. 2 is a block diagram showing a control system of the image display device. 3 is a flowchart showing a display control method of an image display device. FIG. 2 is a diagram showing the overall configuration of an image display device according to a second embodiment. 3 is a diagram showing the overall configuration of an image display device according to Embodiment 3. FIG. FIG. 7 is a diagram showing the overall configuration of an image display device according to a fourth embodiment. FIG. 7 is a diagram showing the overall configuration of an image display device according to a fourth embodiment. FIG. 7 is a diagram showing the overall configuration of an image display device according to another aspect of the fourth embodiment. FIG. 7 is a diagram showing the overall configuration of an image display device according to another embodiment. FIG. 7 is a control block diagram showing the configuration of an image display device according to another embodiment.

Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present disclosure is not limited to the following embodiments. Further, for clarity of explanation, the following description and drawings have been simplified as appropriate.

Embodiment 1.
An image display device 100 according to this embodiment will be described using FIG. 1. FIG. 1 is a diagram showing an image display device 100. FIG. 1 is a perspective view of the tablet terminal 10 viewed from the front side. The image display device 100 includes a tablet terminal 10 and a cradle 20. The tablet terminal 10 has a display 11. The tablet terminal 10 has a rectangular shape.

The display 11 includes a liquid crystal display panel, an organic EL (electro-luminescence) display panel, and the like, and displays a desired image. That is, an image is displayed using display light from the display 11. Furthermore, the display 11 is provided with a touch panel for performing touch operations. The display 11 has a rectangular shape, and a bezel (casing) surrounds the display 11. Further, a camera or the like may be provided on the bezel portion of the tablet terminal 10.

The tablet terminal 10 is equipped with communication functions such as WiFi (registered trademark) and BlueTooth (registered trademark). Further, the tablet terminal 10 is provided with a processor, a memory, a microphone, a speaker, a camera, a vibrator, a button, and the like. The tablet terminal 10 stores an OS (Operating System) program such as Android (registered trademark) and an application program (app) running on the OS in its memory. Note that the tablet terminal 10 may include a smartphone having a calling function such as a telephone. Of course, the configuration of the tablet terminal 10 is not particularly limited. The tablet terminal 10 only needs to have the display 11 and does not need to have all of the above configurations.

The cradle 20 holds the tablet terminal 10 in a detachable manner. When the tablet terminal 10 is placed on the cradle 20, the tablet terminal 10 is held in an upright position. The tablet terminal 10 is held with the display 11 facing sideways and diagonally upward.

The cradle 20 includes a charging terminal (not shown) and the like, and charges the tablet terminal 10. That is, when the user places the tablet terminal 10 on the cradle 20, the charging terminal of the cradle 20 is inserted into the charging port of the tablet terminal, and charging is started. Of course, the tablet terminal 10 may be charged by non-contact charging. Further, the cradle 20 may be provided with a charging port, various interface connectors, and input/output terminals (all not shown).

The cradle 20 is provided with an optical sensor 30 that performs measurements for adjusting display image quality. The optical sensor 30 is a photodiode, a CCD (Charge Coupled Devices) camera, a CMOS (Complementary Metal Oxide Semiconductor) sensor, or the like. The optical sensor 30 outputs a detection signal according to the amount of detected light. The optical sensor 30 projects upward from the cradle 20. With the tablet terminal 10 placed on the cradle 20, the optical sensor 30 is arranged to face the display 11. That is, the optical sensor 30 is attached to the cradle 20 so as to face the display screen of the display 11. A light sensor 30 detects display light from the display 11.

A correction unit, which will be described later, corrects the display image quality of the tablet terminal 10 according to the detection result of the optical sensor 30. For example, when the amount of light detected by the optical sensor 30 decreases, the display brightness of the tablet terminal 10 is increased. Alternatively, when the amount of light detected by the optical sensor 30 increases, the correction unit lowers the display brightness of the tablet terminal 10. For example, if the display 11 is a liquid crystal display, the correction unit adjusts the output of the backlight source of the liquid crystal display. As a result, correction is performed so that the brightness of the displayed image is constant.

Alternatively, the correction unit may adjust the display brightness by correcting the display gradation level. Specifically, the optical sensor 30 measures the luminance of each gradation level of the screen, and the correction unit specifies the gamma characteristic of the display 11 based on the luminance of each gradation level. The correction unit determines whether or not the specified gamma characteristic matches the desired gamma characteristic, and if they do not match, adjusts the gamma characteristic of the display 11 to the desired display characteristic by correcting the gamma characteristic. Note that when the correction unit determines that the specified gamma characteristic matches the predetermined gamma characteristic, the correction unit does not adjust the display characteristics of the display 11. When comparing gamma characteristics, it may be determined that they match if they are within a predetermined range. Thereby, constant display image quality can be maintained.

In this way, in the cradle 20, the optical sensor 30 is fixed at a position where it can receive display light from the display 11. Based on the detection result from the optical sensor 30, the correction section adjusts the display image quality. It becomes possible to adjust display image quality according to fluctuations in display brightness.

Of course, color adjustment may be performed in addition to display brightness. For example, if the optical sensor 30 is a sensor capable of measuring color characteristics, it can detect each of RGB luminance information, so that color adjustment of a displayed image can be performed. By doing so, the display characteristics of each RGB of the display 11 can be corrected individually and independently. A sensor capable of measuring color characteristics is, for example, a CCD.

Since the optical sensor 30 is provided in the cradle 20, the tablet terminal 10 can be made smaller and lighter. Display image quality can be adjusted with a simple configuration. Furthermore, when using the tablet terminal 10, the user removes the tablet terminal 10 from the cradle 20. When the tablet terminal 10 is used, no measurement for adjustment is performed, so there is no problem even if the optical sensor 30 is provided in the cradle 20.

Further, the optical sensor 30 is arranged at the end of the display 11. It is preferable that the optical sensor 30 is configured to be in close contact with the display 11. By doing so, it is possible to prevent environmental light from an indoor light or the like from entering the optical sensor 30.

FIG. 2 is a control block diagram showing a control system for correcting display image quality. The image display device 100 includes a correction control section 101, a measurement pattern generation section 102, a display 11, a photosensor 30, a brightness measurement section 103, and a correction section 104. Here, an example will be described in which display brightness is corrected as display image quality.

The correction control unit 101 controls each control block in order to correct the display image quality. The measurement pattern generation section 102 generates a measurement pattern based on a command from the correction control section 101. The measurement pattern is, for example, a uniform gray pattern. In other words, the measurement pattern is an image that has a uniform gradation level at least in the vicinity of the measurement point measured by the optical sensor 30 on the display 11. Further, the measurement pattern generation unit 102 switches and generates a plurality of gray patterns having different gradation levels at regular intervals. For example, the gradation level changes stepwise from black to white over time.

The display 11 displays the measurement pattern. While the measurement pattern is being displayed, the optical sensor 30 detects the display light from the display 11. It is preferable that the optical sensor 30 detects the display light from the display 11 in synchronization with the switching of the gray pattern. It is further preferable that the optical sensor 30 detects the display light from the display 11 after a predetermined period of time has elapsed after the gray pattern is switched and until a predetermined period of time before the next gray pattern is switched. The optical sensor 30 outputs a detection signal to the brightness measuring section 103. The brightness measurement unit 103 acquires screen brightness information based on the detection signal.

As a result, the brightness measurement unit 103 acquires screen brightness information measured for each gradation of the changing measurement pattern. The detected brightness assumed when the display 11 displays the measurement pattern is set as the reference brightness. The brightness measuring unit 103 calculates screen brightness information by comparing the actually detected detected brightness and the reference brightness. The brightness measurement unit 103 acquires screen brightness information for each gray pattern. Correction control section 101 outputs a correction signal to correction section 104 based on the screen brightness information. The correction unit 104 corrects the display characteristics of the display 11 based on the correction signal.

The display 11 performs image quality adjustment on normal images other than measurement patterns and then displays them. By doing so, the correction control unit 101 can appropriately adjust the display brightness according to changes in the display 11 over time. Display brightness can be kept constant. In other words, even if the display 11 deteriorates or fluctuates over time, display can be performed with stable display brightness characteristics.

The correction control unit 101, the measurement pattern generation unit 102, the brightness measurement unit 103, and the correction unit 104 may be provided in the tablet terminal 10. Alternatively, the correction control section 101, the measurement pattern generation section 102, the brightness measurement section 103, and the correction section 104 may be provided in the cradle 20. Furthermore, some of the correction control section 101, the measurement pattern generation section 102, the brightness measurement section 103, and the correction section 104 may be provided in the tablet terminal 10, and the rest may be provided in the cradle 20.

For example, the correction control section 101, the measurement pattern generation section 102, and the correction section 104 may be provided in the tablet terminal 10, and the brightness measurement section 103 may be provided in the cradle 20. In this case, the brightness measurement unit 103 may transmit the screen brightness information to the tablet terminal 10 by wired communication or wireless communication. That is, by transmitting and receiving necessary signals and information between the tablet terminal 10 and the cradle 20, the control system can be distributed and arranged between the tablet terminal 10 and the cradle 20.

Further, some functions of each control block may be provided in the tablet terminal 10, and the rest may be provided in the cradle 20. For example, the tablet terminal 10 and the cradle 20 may cooperate to realize the function of the correction control unit 101.

The processing in the correction control section 101, the measurement pattern generation section 102, the brightness measurement section 103, and the correction section 104 can be realized by a computer program. For example, an application for performing measurements and corrections is stored in the tablet terminal 10. The above processing is implemented by the processor of the tablet terminal 10 executing the application.

FIG. 3 is a flowchart showing an image quality adjustment method of the image display device 100. First, the user instructs to start correction (S11). For example, the user operates a touch panel or the like and touches a correction start button. As a result, the correction control unit 101 receives an instruction to start correction. Alternatively, upon detecting that the tablet terminal 10 is placed on the cradle 20, the correction control unit 101 may automatically start the correction. Further, the correction control unit 101 may start correction using the start of charging of the tablet terminal 10 as a trigger.

Next, the display 11 displays the measurement pattern generated by the measurement pattern generation unit 102 (S12). The optical sensor 30 detects display light while the measurement pattern is displayed (S13). The correction control unit 101 determines whether measurements at all gradation levels have been completed (S14). If measurements at all gradation levels have not been completed (No in S14), the process returns to S12 and the next measurement pattern is displayed. That is, the display 11 displays measurement patterns with different gradation levels (S12), and the optical sensor 30 detects display light (S13). As a result, measurement is performed using the gray pattern of the next gradation level.

When measurements at all gradation levels are completed (Yes in S14), the correction control unit 101 and the correction unit 104 correct the display characteristics (S15). That is, the correction control unit 101 generates a correction signal based on the detection result of the display light. Then, the correction unit 104 adjusts the display brightness of the display 11 based on the correction signal. For example, the correction unit 104 adjusts the output of the light source of the display 11 or adjusts the gamma characteristics based on the correction signal. Thereby, display image quality can be adjusted with a simple configuration.

Embodiment 2.
In the first embodiment, the optical sensor 30 was fixed to the cradle 20, but in the second embodiment, the optical sensor 30 is movable. An image display device 100 according to a second embodiment will be described using FIG. 4.

An optical sensor 30 is provided to be movable up and down. When performing measurement for image quality adjustment, the optical sensor 30 moves upward (in the direction of the arrow). That is, by moving the optical sensor 30 on the display 11, the optical sensor 30 can receive display light. Similar to the first embodiment, the correction unit 104 performs display control based on the result of light reception by the optical sensor 30.

Furthermore, when the measurement for image quality adjustment is completed, the optical sensor 30 moves downward. The optical sensor 30 moves to the outside of the display 11. Thereby, the optical sensor 30 is housed in the cradle 20. Even when the tablet terminal 10 is placed on the cradle 20, the user can visually recognize the entire display 11. That is, since the optical sensor 30 moves to the outside of the display screen of the display 11, it no longer blocks the display screen of the display 11.

In this embodiment, the optical sensor 30 and a mechanism for moving the optical sensor 30 are provided in the cradle 20. Therefore, similarly to the first embodiment, the tablet terminal 10 can be made lighter and smaller. Display image quality can be adjusted with a simple configuration.

The movement of the optical sensor 30 may be performed automatically or manually. For example, when adjusting the display, the user may manually move the optical sensor 30. The user only has to pull out the optical sensor 30 from the cradle 20. In this case, the optical sensor 30 may be attached to a linear guide mechanism or the like that guides vertical movement. Further, a switch or the like may be provided to detect that the optical sensor 30 has been moved by the user. When it is detected that the optical sensor 30 has moved to a position where it can receive display light, the correction control unit 101 starts measurement. That is, when the user moves the optical sensor 30, measurement starts. Thereby, correction can be performed without the user operating the touch panel.

Alternatively, a moving mechanism may be provided that moves the optical sensor 30 using the weight of the tablet terminal 10. In this case, when the tablet terminal 10 is placed on the cradle 20, the moving mechanism automatically moves the optical sensor 30 upward. When the optical sensor 30 moves upward, the correction control unit 101 starts measurement. Thereby, correction can be performed without any user operation.

The cradle 20 may be provided with an actuator such as a motor to move the optical sensor 30. In this case, when the user performs a touch operation on the tablet terminal 10, the actuator moves the optical sensor 30. Alternatively, a switch or sensor may be provided to detect that the tablet terminal 10 is placed on the cradle 20. For example, the installation of the tablet terminal 10 may be detected using an electronic element such as a microswitch, a magnetic element, or an optical element. Then, the actuator may move the optical sensor 30 depending on the detection result.

Furthermore, the display may be adjusted automatically by detecting that the tablet terminal 10 is placed on the cradle 20. Depending on the detection result of a switch or the like, the optical sensor 30 automatically moves to a position where it can receive display light. Alternatively, the optical sensor 30 may move when charging is started. Then, when the measurement is completed or when the tablet terminal 10 is removed from the cradle 20, the optical sensor 30 moves downward. Thereby, convenience can be improved. Further, the display may be adjusted periodically.

Embodiment 3
In the embodiment, the cradle 20 has an arm 40, as shown in FIG. An arm 40 supports the optical sensor 30. Note that the configuration other than the arm 40 is the same as that in Embodiments 1 and 2, and therefore the description will be omitted as appropriate.

An arm 40 is provided between the cradle 20 and the optical sensor 30. The optical sensor 30 is provided at one end (tip) of the arm 40, and the other end (base end) of the arm 40 is attached to the cradle 20. The arm 40 has a rotating shaft 41 at its base end on the cradle 20 side. The optical sensor 30 is attached to the cradle 20 via an arm 40.

Arm 40 extends parallel to the surface of display 11. The arm 40 is a rotating arm that rotates in the direction of the arrow with the rotating shaft 41 as the center of rotation. In other words, the optical sensor 30 moves in an arc centered on the rotation axis 41. The optical sensor 30 rotates and moves on the display 11 of the tablet terminal 10.

By doing so, the optical sensor 30 can be moved from the outside of the display 11 to the front. When performing measurements for image quality adjustment, the arm 40 rotates so that the optical sensor 30 moves to the front of the display 11. After the measurement is completed, the optical sensor 30 may be moved to the outside of the display 11. Note that the length of the arm 40 and the position of the rotation axis 41 are preferably set so that the optical sensor 30 passes through the center of the display 11. Here, passing through the center of the display 11 includes not only passing through one point in the center, but also passing through a part of a predetermined area including the center, such as a rectangle, a perfect circle, an ellipse, etc.

By changing the rotation angle of the arm 40, the optical sensor 30 moves on the display screen of the display 11. The light receiving position of the optical sensor 30 can be changed on the display screen of the display 11. The optical sensor 30 detects display light at each light receiving position. The correction unit 104 performs correction according to the detection results of display light at a plurality of light receiving positions.

By doing so, variations in the brightness distribution of the display 11 can be suppressed. For example, the optical sensors 30 receive display light at the center and end portions of the display 11, respectively. By comparing the light reception results at the center and at the ends, variations in brightness distribution can be corrected. Luminance unevenness (deterioration of uniformity) on the display screen can be suppressed. In this case, a sensor or mechanism for detecting the rotation angle of the arm 40 may be provided. That is, the detection position on the display 11 can be specified according to the rotation angle of the arm 40. Then, the correction control unit 101 may generate a correction signal by associating the rotation angle with the screen brightness information. The correction unit 104 may divide the display area of the display 11 into a plurality of areas and adjust the brightness.

For example, while the display 11 displays a uniform gray pattern, the optical sensor 30 detects display light at the edges and center, respectively. When the detected brightness at the edge becomes lower than the detected brightness at the center, the correction control unit 101 generates a correction signal so that the display brightness at the edge relatively increases.

The rotation of arm 40 may be performed manually or automatically. In the manual case, the user rotates the arm 40 around the rotation axis. Thereby, the position of the optical sensor 30 can be changed. An actuator for rotating the arm 40 may be provided in the cradle 20 to automatically move the arm 40.

The same trigger as in Embodiments 1 and 2 can be used to start the measurement. For example, measurement may be started by a touch operation. Alternatively, the measurement may be performed automatically by detecting that the tablet terminal 10 is placed in the cradle 20.

Further, the arm 40 may be a telescoping arm instead of a rotating arm. That is, the light receiving position of the optical sensor 30 may change as the arm 40 expands and contracts. Furthermore, the arm 40 may extend and contract as well as rotate. By doing so, the optical sensor 30 can be moved to any position on the display 11.

In this embodiment, the arm 40 and the optical sensor 30 are provided on the cradle 20. Therefore, similarly to Embodiments 1 and 2, the tablet terminal 10 can be made lighter and smaller. Display image quality can be adjusted with a simple configuration.

Embodiment 4.
Image display device 100 according to Embodiment 4 will be described using FIGS. 6 and 7. FIG. 6 is a perspective view schematically showing the configuration of the image display device 100. FIG. 6 is a front view of the cradle 20 on which the tablet terminal 10 is placed. FIG. 7 is a view of the cradle 20 on which the tablet terminal 10 is placed, viewed from the back side.

The cradle 20 is provided with a front support part 22 and a back support part 21. The front support part 22 supports the front side of the tablet terminal 10, and the back support part 21 supports the back side of the tablet terminal 10. The cradle 20 holds the tablet terminal 10 by disposing the tablet terminal 10 between the front support part 22 and the back support part 21.

Furthermore, the tablet terminal 10 can be placed on the cradle 20 with the front and back reversed. That is, the cradle 20 can hold the tablet terminal 10 with the display 11 facing the back support part 21.

An optical sensor 30 is provided above the back support portion 21 . The optical sensor 30 protrudes upward from the back support part 21. As described above, the tablet terminal 10 can be placed on the cradle 20 with the front and back reversed. A user places the tablet terminal 10 on the cradle 20 so that the back support section 21 faces the display 11 and the front support section 22 faces the back surface of the tablet terminal 10. By doing so, the optical sensor 30 can receive display light from the display 11. Therefore, measurements can be performed in the same manner as in Embodiments 1 to 3.

In the cradle 20, the back support part 21 is higher than the front support part 22 of the tablet terminal 10. That is, in the cradle 20, the front support part 22 is lower than the lower end of the display 11 so as not to block the display 11. On the other hand, the back support part 21 can be made higher than the lower end of the display 11. Therefore, the back support part 21 projects higher than the front support part 22.

By installing the optical sensor 30 on the back support portion 21, the optical sensor 30 can be placed at or near the center of the display 11. In other words, the optical sensor 30 can detect display light at the center of the display 11. Thereby, image quality adjustment can be performed more appropriately.

The cradle 20 may be provided with a switch or the like that detects that the tablet terminal 10 is placed upside down. For example, using a magnetic switch or a mechanical switch, it is detected that the tablet terminal 10 is placed upside down. Then, when it is detected that the front and back sides have been placed upside down, measurement is performed. In other words, if the display 11 is placed facing the front support 22, no measurements can be made. By doing so, convenience can be improved.

The optical sensor 30 is not limited to a configuration in which it protrudes upward from the back support portion 21. For example, the optical sensor 30 may be provided as shown in FIG. In FIG. 8, the optical sensor 30 does not protrude from the back support part 21, but is built into the back support part 21. The optical sensor 30 is arranged facing the front side of the back support part 21, that is, facing the tablet terminal 10 side. Therefore, when the tablet terminal 10 is placed upside down in the cradle 20 (when the display screen and the photosensor 30 built into the back support part 21 face each other directly), the photosensor 30 detects the display light at the center of the display 11. Detect. Since the back support 21 has a height that reaches the center of the display 11 or the vicinity thereof, the optical sensor 30 can be placed within the back support 21 . Thereby, design quality can be improved.

Other embodiments.
In the first to fourth embodiments, the cradle 20 is provided with one optical sensor 30, but the cradle 20 may be provided with a plurality of optical sensors 30. For example, both optical sensors 30 shown in Embodiment 1 and Embodiment 4 may be provided in cradle 20. Furthermore, a plurality of optical sensors 30 may be provided on the front support portion 22. Alternatively, a plurality of optical sensors 30 may be provided on the back support portion 21. By doing so, it becomes possible to perform measurements using multiple locations on the display 11 as light receiving positions. By providing a plurality of optical sensors 30, measurements can be made at multiple locations on the display 11 without a moving mechanism for moving the optical sensors 30.

Note that the configuration for moving the optical sensor 30 is not limited to the configurations of the second and third embodiments. For example, as shown in FIG. 9, the optical sensor 30 may be moved using a wire 24 pulled out from the cradle 20. In this case, the wire 24 is passed through a through hole provided in the optical sensor 30.

The user can move the optical sensor 30 along the wire 24 (in the direction of the arrow in FIG. 8). During measurement, the user holds the wire 24 in a stretched state. Then, the user moves the optical sensor 30 along the wire 24 to an appropriate position to perform measurement. Therefore, display image quality can be adjusted with a simple configuration. Further, any position on the display 11 can be set as the light receiving position. When not measuring, the wire 24 is wound up and housed in the cradle 20.

Further, a plurality of tablet terminals 10 may correspond to one cradle 20. The plurality of tablet terminals 10 may be of plural types having different screen sizes and display characteristics. A plurality of tablet terminals 10 may share one cradle. For example, two tablet terminals 10 may be placed alternately on one cradle 20. In this case, one cradle 20 can adjust the image quality of multiple tablet terminals 10. Adjustment can be made so that the image quality of the plurality of tablet terminals 10 is equal. For example, the display brightness of other tablet terminals 10 can be adjusted to be equal to the display brightness of one tablet terminal 10.

Further, the image display device 100 may store profile information such as the position of the optical sensor 30 that measures the screen, the measurement point, and the screen display characteristic control method for each type of tablet terminal. Then, the correction control unit 101 may detect the type of the placed tablet terminal 10, read out the profile information, and apply it to the correction. This eliminates the need for the user to manually make settings related to display image quality correction depending on the type of tablet terminal 10 placed in the cradle, and these settings are automatically made.

A preferred embodiment in this case will be described using FIG. 10. FIG. 10 is a block diagram showing the configuration of the image display device 100. Here, as in the third embodiment, the optical sensor 30 is movable by the arm 40. The cradle 20 is capable of holding a plurality of types of tablet terminals 10. Here, the cradle 20 identifies the holdable tablet terminals as the tablet terminals 10a and 10b. Note that descriptions of contents common to Embodiments 1 to 4 will be omitted as appropriate.

The tablet terminals 10a and 10b are of different types. Specifically, the sizes of the displays 11 are different between the tablet terminal 10a and the tablet terminal 10b. The cradle 20 is capable of detecting the types of tablet terminals 10a and 10b. The cradle 20 is provided with a profile information storage section 111.

The profile information storage unit 111 is a memory or the like, and stores profile information for each type of tablet terminal 10a, 10b. For example, the profile information is the measured position of the optical sensor 30 with respect to the display 11. Specifically, the profile information storage unit 111 stores the rotation angle and the amount of expansion and contraction of the arm 40, which is the measurement position, for each size of the display 11. Alternatively, the profile information storage unit 111 may store the coordinates of the measurement position of the display 11. Of course, the optical sensor 30 may detect display light at two or more measurement positions for one tablet terminal 10a.

When the tablet terminal 10 is placed on the cradle 20, the correction control unit 101 of the cradle 20 detects the type of the tablet terminal 10. The correction control unit 101 drives the arm 40 with reference to profile information corresponding to the detected type. The arm 40 operates so that the optical sensor 30 moves to the measurement position on the display 11. The measurement is completed when the optical sensor 30 detects the display light at the measurement position indicated by the profile information. Then, the correction unit 104 corrects the display characteristics based on the measurement results. The measurement and correction controls are the same as those described above, so their explanation will be omitted.

Profile information storage unit 111 stores profile information for each type of tablet terminal 10. When the correction control unit 101 acquires the type of the tablet terminal 10, the correction control unit 101 controls the position of the optical sensor 30 with respect to the display 11 according to the profile information. Therefore, measurements can be performed at appropriate measurement positions for each display 11 of different size. Therefore, appropriate correction can be made for each of the different types of tablet terminals 10a and 10b. Further, detection of the type of tablet terminal 10, driving of the arm 40, etc. may be performed automatically. This eliminates the need for the user to make settings related to display image quality correction, thereby improving convenience.

Note that the profile information stored in the profile information storage section 111 may include information other than the measurement position of the optical sensor 30. The profile information may include how to control display characteristics. In other words, the display control method may be different for each type of tablet terminal 10. Specifically, the tablet terminal 10a may perform brightness adjustment, and the tablet terminal 10b may perform gamma characteristic adjustment. Alternatively, the display gradation and display brightness of the measurement pattern may be changed for each tablet terminal. The profile information may include information regarding the performance of the display 11. Furthermore, the types of tablet terminals 10 are not limited to two, but may be classified into three or more types.

Further, in the above description, the profile information storage unit 111 is provided in the cradle 20, but the profile information storage unit 111 may be provided in a location other than the cradle 20. For example, the profile information storage unit 111 may be provided in the tablet terminal 10. Alternatively, the profile information storage unit 111 may be provided in a server device or the like that manages a plurality of tablet terminals 10. In this case, the tablet terminal 10, the server device, or the like may transmit the profile information to the correction control unit 101.

The image display device 100 is suitable for a medical monitor that displays diagnostic images of a patient. Since diagnostic images can be stably displayed with appropriate display image quality, it is possible to contribute to improving diagnostic accuracy. Examples of diagnostic images include endoscopic images, MRI (Magnetic Resonance Imaging) images, CT (Computed Tomography) images, and X-ray images. Of course, the image display device 100 is not limited to a medical monitor. For example, the image display device 100 can be applied to a DTP monitor or a monitor for other uses.

The above embodiments can be combined as appropriate. Some or all of the above processes may be executed by a computer program. The programs described above can be stored and provided to a computer using various types of non-transitory computer readable media. Non-transitory computer-readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (eg, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs, CD-R/W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory)). The program may also be provided to the computer on various types of transitory computer readable media. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can provide the program to the computer via wired communication channels, such as electrical wires and fiber optics, or wireless communication channels.

Although the invention made by the present inventor has been specifically explained based on the embodiments above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist thereof. Needless to say. It is also possible to combine two or more of the above embodiments as appropriate.

100 Image display device 10 Tablet terminal 11 Display 20 Cradle 21 Back support section 22 Front support section 30 Optical sensor 40 Arm 101 Correction control section 102 Measurement pattern generation section 103 Brightness measurement section 104 Correction section

Claims (10)

A tablet terminal having a display,
a cradle that holds the tablet terminal;
An image display device comprising: a photosensor provided in the cradle and capable of receiving display light from the display. The optical sensor is movably provided in the cradle,
The image display device according to claim 1, wherein the optical sensor moves on the display. The cradle is provided with a rotating arm that supports the optical sensor,
The image display device according to claim 1 or 2, wherein the optical sensor moves on the display by rotation of the rotating arm. The image display device according to any one of claims 1 to 3, further comprising a correction unit that corrects display image quality of the tablet terminal based on a result of light reception by the optical sensor. The light receiving position of the optical sensor with respect to the display is variable,
The image display device according to claim 4, wherein the correction unit corrects the display image quality of the tablet terminal based on detection results obtained by detecting the display light by the optical sensor at two or more light receiving positions. The cradle is
comprising a back support part that supports the back side of the tablet terminal,
The optical sensor is provided on the back support part,
The image display device according to any one of claims 1 to 5, wherein the tablet terminal can be installed in the cradle with the front and back reversed. The cradle is capable of holding multiple types of tablet terminals,
The image display device includes:
a profile storage unit that stores profile information for each type of tablet terminal;
The image display device according to any one of claims 1 to 6, further comprising a correction control unit that controls a position of the optical sensor with respect to the display according to the profile information. A tablet device with a display,
a cradle that holds the tablet terminal;
A display control method for an image display device, comprising: a photosensor provided in the cradle;
detecting display light from the display by the optical sensor;
A display control method comprising: correcting display characteristics of the display based on a detection result by the optical sensor. The cradle is capable of holding multiple types of tablet terminals,
The image display device includes a memory storing profile information for each type of tablet terminal,
The display control method according to claim 8, wherein the position of the optical sensor with respect to the display is controlled according to the profile information. a holding part that holds a tablet terminal;
A cradle comprising: an optical sensor that detects display light from a display of the tablet terminal.

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