Method for adjusting the color temperature setting in a display device, and display system

Abstract

To provide a display device capable of adjusting the color of displayed images while taking into account aging deterioration.SOLUTION: A first display control unit 110a controls to display a reference image represented by reference image signals provided by an image supply device on a screen. The reference image is a white image for example. A first reception unit 110b receives an operation to instruct color temperature measurement of the reference image from a user. A first acquisition unit 110c acquires color temperature by measuring the color temperature in the reference image according to the operation received by the first reception unit 110b. A first change unit 110e changes the color temperature setting value included in a piece of setting information so that the color temperature acquired by the first acquisition unit 110c gets closer to the standard color temperature.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a method for adjusting color temperature set values in a display device, and a display system. [Background Art]

[0002] A multi-projection system including a plurality of projectors can display one large image by combining the projected images of the respective projectors. When a large image is displayed by combining the projected images of individual projectors, it is necessary to perform color adjustment on each projector so that the boundary between adjacent projected images is not noticeable. As a prior art related to color adjustment of projectors, for example, the technology disclosed in Patent Document 1 can be cited. In the technology disclosed in Patent Document 1, data before and after color temperature adjustment performed in the manufacturing process of each projector is stored in each projector as color temperature information, and the color temperature information stored in each projector is compared, thereby adjusting the color of projected images between projectors. [Prior Art Literature] [Patent Literature]

[0003] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2021-140119 [Summary of Invention] [Problem to be Solved by the Invention]

[0004] The tint of the image projected by a projector may change from the time of manufacture of the projector due to aged deterioration of an optical system including a projection lens and other components. In the technology disclosed in Patent Document 1, color adjustment of projected images between projectors is performed based on data before and after color temperature adjustment performed in the manufacturing process of the projectors. Therefore, it cannot cope with changes in tint caused by aged deterioration, and there is a risk that adjustment accuracy may decrease. [Means for Solving the Problem]

[0005] One aspect of a method for adjusting the color temperature setting in a display device of the present disclosure includes: displaying a first image based on a first image signal using a first display device; receiving a first operation from a user to instruct the measurement of the color temperature in the first image; obtaining a first color temperature by measuring the color temperature of the first image in response to the first operation; and changing the color temperature setting in the first display device so that the first color temperature approaches a reference color temperature.

[0006] One aspect of the display system of the present disclosure includes a first display device that displays a first image based on an image signal, a measuring device that measures the first image, and a processing device, wherein the processing device performs the following actions: causing the first image based on the first image signal to be displayed on the first display device; receiving an operation from a user to instruct the measurement of the color temperature in the first image; obtaining a first color temperature based on the measurement result obtained by the measuring device from the first image; and changing the color temperature setting value in the first display device so that the first color temperature approaches a reference color temperature. [Brief explanation of the drawing]

[0007] [Figure 1] This figure shows an example configuration of a display system 1A including a display device 10 according to a first embodiment of the present disclosure. [Figure 2] This figure shows an example configuration of the display device 10. [Figure 3] This figure shows an example of a reference image G1 and a setting notification image G2 that the display device 10 displays on the display surface SS. [Figure 4] This is a flowchart showing the flow of the adjustment method executed by the processing unit 110 of the display device 10 according to the program PRA. [Figure 5] This is a block diagram showing an example configuration of the display device 11 according to a second embodiment of the present disclosure. [Figure 6] This flowchart shows the flow of the adjustment method executed by the processing unit 110 of the display device 11 according to the program PRB. [Figure 7] This figure shows an example configuration of a display system 1C including a display device 12 according to a third embodiment of the present disclosure. [Figure 8] This figure shows an example configuration of the display device 12. [Figure 9] This flowchart shows the flow of the adjustment method executed by the processing unit 110 of the display device 12 according to the program PRC. [Modes for carrying out the invention]

[0008] The embodiments described below are subject to various technically preferred limitations. However, the embodiments of this disclosure are not limited to those described below. 1. First Embodiment Figure 1 shows an example configuration of a display system 1A according to a first embodiment of the present disclosure. The display system 1A includes a display device 10A, a display device 10B, and a camera 20. Display devices 10A and 10B are projectors that project image light onto a display surface SS to display an image represented by the image light. The display surface SS is, for example, a projection screen. An image supply device (not shown) is connected to display devices 10A and 10B by wire or wireless. Display device 10A displays an image corresponding to the image data supplied from the image supply device in area PGA on the display surface SS. Similarly, display device 10B displays an image corresponding to the image data supplied from the image supply device in area PGB on the display surface SS. Hereinafter, when it is not necessary to distinguish between display devices 10A and 10B, display devices 10A and 10B will be referred to as display device 10.

[0009] Camera 20 includes an image sensor that converts light focused by an optical system such as a lens into an electrical signal. Specific examples of the image sensor in camera 20 include a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). Camera 20 is fitted with a filter for receiving visible light. In other words, the image captured by camera 20 is a visible image. Camera 20 is connected to display device 10A via a first communication line and to display device 10B via a second communication line. Camera 20 captures an image of a predetermined range including the display surface SS under the control of display device 10. Camera 20 outputs image data representing the captured image obtained by capturing an image of a predetermined range including the display surface SS to display device 10. Camera 20 is an example of a measuring device in this disclosure. Image data representing the captured image obtained by capturing an image of a predetermined range including the display surface SS with camera 20 is an example of a measurement result in this disclosure.

[0010] The connection between the camera 20 and the display device 10A may be a wireless connection. The connection between the camera 20 and the display device 10A may also be a wireless connection. In this embodiment, one camera 20 is connected to the display device 10A and the display device 10B, but the camera 20 connected to the display device 10A and the camera 20 connected to the display device 10B may be separate devices. If the camera 20 connected to the display device 10A and the camera 20 connected to the display device 10B are separate devices, the camera 20 may be included in the display device 10.

[0011] The display device 10 adjusts the color temperature setting of the image displayed on the display surface SS based on the image captured by the camera 20. Color temperature is a numerical value that quantitatively represents the color of light, and specifically, it is a value that expresses the color of light in terms of the temperature of a black body that emits light of that color. The unit of color temperature is K (Kelvin). Figure 2 is a diagram showing an example of the configuration of the display device 10. As shown in Figure 2, the display device 10 includes a processing unit 110, a projection unit 120, an input unit 130, and a storage device 140. In addition to the processing unit 110, projection unit 120, input unit 130, and storage device 140, the display device 10 also includes a communication device for communicating with the image supply device by wired or wireless means. This communication device is not shown in Figure 2.

[0012] The processing unit 110 is comprised of a processor, such as a CPU (Central Processing Unit), i.e., a computer. The processing unit 110 may consist of a single processor or multiple processors. The processing unit 110 functions as the control center for the display device 10 by operating according to the program PRA stored in the storage device 140.

[0013] The projection device 120 includes a projection lens, a liquid crystal drive unit, a liquid crystal panel, and a light source unit. Hereinafter, the projection lens, liquid crystal drive unit, liquid crystal panel, and light source unit included in the projection device 120 will be referred to as the optical system of the projection device 120. In Figure 2, the optical system is not shown. The liquid crystal drive unit drives the liquid crystal panel according to the image data supplied from the processing device 110, thereby drawing the display image represented by this image data onto the liquid crystal panel. The light source unit includes, for example, a light source such as a halogen lamp or a laser diode. Light from the light source unit is modulated for each pixel in the liquid crystal panel and projected as image light through the projection lens. When this image light is projected onto the display surface SS, an image is displayed on the display surface SS. Note that the projection device 120 only needs to be configured to project image light onto the display surface SS, and may also include a digital mirror device (DMD) instead of the liquid crystal drive unit and liquid crystal panel.

[0014] The input device 130 includes a plurality of operators that accept various types of input operations from a user. Specific examples of the plurality of operators included in the input device 130 include buttons, switches, numeric keys, and cursor keys arranged on the housing of the display device 10 or a remote controller not illustrated. The input device 130 outputs data indicating the content of a user's operation to the processing device 110. This allows the content of the user's operation to be transmitted to the processing device 110.

[0015] The storage device 140 is a recording medium readable by the processing device 110. The storage device 140 includes, for example, a non-volatile memory and a volatile memory. The non-volatile memory is, for example, ROM (Read Only Memory), EPROM (Erasable Programmable Read Only Memory), or EEPROM (Electrically Erasable Programmable Read Only Memory). The volatile memory is, for example, RAM (Random Access Memory).

[0016] A program PRA that causes the processing device 110 to execute the adjustment method of the present disclosure is stored in advance in the non-volatile memory of the storage device 140. The non-volatile memory also stores setting information indicating various settings related to an image displayed by the display device 10. This setting information includes a set color temperature that defines the tint of an image displayed by the display device 10, that is, image light projected by the projection device 120. The set color temperature in the present embodiment represents the color temperature of white in image light projected by the projection device 120, and tints other than white, such as red or blue, are also determined in accordance with the set color temperature. For example, when an image signal representing a certain color temperature is supplied from an image supply device, adjustment of the tint of an image displayed on the display surface SS is achieved by correcting the image signal in accordance with the difference between the color temperature representing white and the set color temperature. The set color temperature is an example of a set value of color temperature in the present disclosure.

[0017] The color temperature of white is generally 5000K. However, depending on the characteristics of the optical system of the projection apparatus 120, even if the set color temperature is set to 5000K, the white color in an image actually displayed on the display surface SS may be reddish, or conversely bluish. In the present embodiment, at the time of shipment of the display apparatus 10 from the factory, the set color temperature is adjusted in advance such that the white color in an image displayed on the display surface SS does not become reddish or conversely bluish. However, the tint of an image displayed on the display surface SS may change in accordance with aged deterioration or the like of the optical system. Therefore, in the present embodiment, the tint of an image displayed on the display surface SS can be adjusted by a user of the display apparatus 10 adjusting the set color temperature.

[0018] The volatile memory of the storage apparatus 140 is utilized by the processing apparatus 110 as a work area when executing the program PRA.

[0019] Triggered by the turning on of the power of the display apparatus 10, the processing apparatus 110 reads the program PRA from the non-volatile memory to the volatile memory, and starts executing the read program PRA. Note that in FIG. 2, illustration of the power supply of the display apparatus 10 is omitted. The processing apparatus 110 operating in accordance with the program PRA functions as the first display control unit 110a, the first reception unit 110b, the first acquisition unit 110c, the first setting unit 110d, the first change unit 110e, and the second display control unit 110f shown in FIG. 2. The first display control unit 110a, the first reception unit 110b, the first acquisition unit 110c, the first setting unit 110d, the first change unit 110e, and the second display control unit 110f shown in FIG. 2 are software modules realized by operating the processing apparatus 110 in accordance with the program PRA. The functions respectively performed by the first display control unit 110a, the first reception unit 110b, the first acquisition unit 110c, the first setting unit 110d, the first change unit 110e, and the second display control unit 110f shown in FIG. 3 are as follows.

[0020] The first display control unit 110a displays an image on the display surface SS by projecting light representing an image based on an image signal supplied from the image supply device onto the projection device 120. The first display control unit 110a then causes the camera 20 to capture an image of a predetermined range including the display surface SS on which the image is displayed. An example of an image signal supplied from the image supply device to the display device 10 is an image signal representing a reference image G1 used when adjusting the color temperature in the display device 10.

[0021] Figure 3 shows the reference image G1 in this embodiment. The horizontal hatching in Figure 3 represents a color with a color temperature of 5000K, i.e., white. As shown in Figure 3, the reference image G1 is an image filled with white. In this embodiment, the reference image G1 is an image filled with white, but it may be an image filled with other colors. Furthermore, the reference image G1 is not limited to an image filled with a single color, but may be an image filled with multiple colors. Hereinafter, the image signal representing the reference image G1 will be referred to as the reference image signal. The reference image signal provided from the image supply device to each of the display devices 10A and 10B is an example of the first image signal in this disclosure. The reference image G1 that the display device 10A displays in area PGA of the display surface SS based on the reference image signal is an example of the first image in this disclosure. The reference image G1 that the display device 10B displays in area PGB of the display surface SS based on the reference image signal is an example of the second image in this disclosure.

[0022] The first reception unit 110b accepts user operations by receiving data output from the input device 130. Specific examples of user operations accepted by the first reception unit 110b include an operation to instruct the display device 10 to acquire the color temperature of a reference image G1 displayed on the display surface SS, and an operation to specify a reference color temperature to be used as a reference when adjusting the color tone of an image displayed on the display surface SS. The former operation performed on the display device 10A is an example of the first operation in this disclosure, and the latter operation is an example of the second operation in this disclosure. An operation performed on the display device 10B to instruct the acquisition of color temperature is an example of the third operation in this disclosure.

[0023] The first acquisition unit 110c acquires the color temperature of the reference image G1 displayed on the display surface SS by the projection device 120 in response to the first operation. In this embodiment, the first acquisition unit 110c instructs the camera 20 to image a predetermined range including the display surface SS while the first display control unit 110a displays the reference image G1 on the display surface SS. The first acquisition unit 110c acquires image data representing the image captured by the camera 20 from the camera 20. In the display device 10A, the first acquisition unit 110c acquires the color temperature of the reference image G1 displayed in region PGA by analyzing region PGA in the image captured by the camera 20. In the display device 10B, the first acquisition unit 110c acquires the color temperature of the reference image G1 displayed in region PGB by analyzing region PGB in the image captured by the camera 20. The color temperature acquired by the first acquisition unit 110c of the display device 10A is an example of the first color temperature in this disclosure. The color temperature acquired by the first acquisition unit 110c of the display device 10B is an example of the second color temperature in this disclosure.

[0024] The first setting unit 110d sets the reference color temperature in response to the second operation. In this embodiment, the user sets the color temperature of the reference image G1 as the reference color temperature. That is, in this embodiment, 5000K is set as the reference color temperature. In this embodiment, the user sets the reference color temperature by the second operation on the input device 130, but the first setting unit 110d may set the reference color temperature based on the reference image signal.

[0025] The first modification unit 110e modifies the set color temperature, which includes setting information, so that the color temperature acquired by the first acquisition unit 110c approaches the reference color temperature. Specifically, if the color temperature acquired by the first acquisition unit 110c exceeds the reference color temperature, the first modification unit 110e modifies the set color temperature so that the color temperature of the displayed image decreases by a certain amount. In this embodiment, the reference color temperature is the color temperature that represents white, so if the color temperature acquired by the first acquisition unit 110c exceeds the reference color temperature, it means that the reference image G1 displayed on the display surface SS has a bluish tint. In this case, the first modification unit 110e changes the set color temperature to a value smaller by the aforementioned certain amount in order to reduce the bluish tint of the image displayed on the display surface SS, that is, so that the color temperature of the image decreases by a certain amount.

[0026] Furthermore, if the color temperature acquired by the first acquisition unit 110c is lower than the reference color temperature, the set color temperature is changed so that the color temperature of the displayed image increases by a certain value. If the color temperature acquired by the first acquisition unit 110c is lower than the reference color temperature, it means that the reference image G1 displayed on the display surface SS has a reddish tint. In this case, the first modification unit 110e changes the set color temperature to a value that is higher by the aforementioned certain value in order to reduce the redness of the image displayed on the display surface SS, that is, so that the color temperature of the image increases by a certain value. A specific example of the above certain value is 50K. The user may appropriately set a suitable value for this certain value by operating the input device 130.

[0027] The second display control unit 110f notifies the user of the set color temperature by displaying a setting notification image G2 on the display surface SS, which includes an image showing the set color temperature value after the change made by the first modification unit 110e. A specific example of an image showing the set color temperature value is, for example, an image in which the background is filled with the color representing the set color temperature and a string of characters indicating the set color temperature value is placed on it, as shown in Figure 3. The vertical hatching in Figure 3 represents the color corresponding to the set color temperature.

[0028] Furthermore, the processing unit 110, which operates according to the program PRA, performs the adjustment method shown in Figure 4. As shown in Figure 4, this adjustment method includes a first reception process SA110, a first acquisition process SA120, a first setting process SA130, a first change process SA140, and a notification process SA150.

[0029] In the first reception process SA110, the processing unit 110 functions as the first reception unit 110b. In the first reception process SA110, the processing unit 110 accepts user operations by receiving data output from the input device 130.

[0030] In the first acquisition process SA120 that follows the first reception process SA110, the processing unit 110 functions as a first display control unit 110a and a first acquisition unit 110c. In the first acquisition process SA120, the processing unit 110 displays the reference image G1 on the display surface SS by projecting the reference image G1 onto the display surface SS using the projection device 120 in response to the first operation. Next, the processing unit 110 has the camera 20 capture an image of a predetermined range including the display surface SS, and obtains the color temperature of the reference image G1 displayed on the display surface SS by analyzing the captured image.

[0031] In the first setting process SA130, which follows the first acquisition process SA120, the processing unit 110 functions as the first setting unit 110d. In the first setting process SA130, the processing unit 110 sets the reference color temperature according to the second operation. Note that the execution order of the first acquisition process SA120 and the first setting process SA130 may be reversed, with the first acquisition process SA120 being executed after the first setting process SA130.

[0032] In the first modification process SA140, the processing unit 110 functions as the first modification unit 110e. In the first modification process SA140, the processing unit 110 changes the set color temperature so that the color temperature acquired in the first acquisition process SA120 approaches the reference color temperature.

[0033] In notification processing SA150, the processing unit 110 functions as a second display control unit 110f. In notification processing SA150, the processing unit 110 notifies the user of the set color temperature changed in the first change processing SA140 by displaying the set notification image G2 on the display surface SS.

[0034] The user of the display device 10 can understand the set color temperature value by viewing the setting notification image G2. Furthermore, if the set color temperature differs from the reference color temperature, the difference between the two reflects the characteristics of the display device 10's projection device 120. The user of the display device 10 can understand the characteristics of the display device 10's projection device 120 from the difference between the set color temperature value displayed in the setting notification image G2 and the reference color temperature.

[0035] If the setting notification image G2 appears reddish, or if the setting notification image appears bluish, the user of the display device 10 can input an instruction to continue changing the set color temperature by performing an input operation on the input device 130. Hereinafter, the instruction to continue changing the set color temperature will be referred to as a "continue instruction." Conversely, if the setting notification image G2 is not reddish and is white with no bluish tint, the user can input an instruction to end the change in set color temperature by performing an input operation on the input device 130. Hereinafter, the instruction to end the change in set color temperature will be referred to as a "end instruction."

[0036] If a continuation instruction is received through an input operation to the input device 130, the processing unit 110 may re-execute the first acquisition process SA120, the first change process SA140, and the notification process SA150. Conversely, if a termination instruction is received, the adjustment method may be terminated. Furthermore, if user confirmation of the set color temperature is not required, the second display control unit 110f and the notification process SA150 may be omitted.

[0037] According to this embodiment, in each of the display devices 10A and 10B, the set color temperature is changed based on the measured value of the color temperature of the reference image G1 displayed on the display surface SS by the projection device 120. The color of the image displayed on the display surface SS by the projection device 120 reflects the characteristics of the projection device 120, and these characteristics change in accordance with the aging deterioration of the optical system, such as clouding of the projection lens or deterioration of the projection panel. Therefore, according to this embodiment, the set color temperature can be adjusted taking into account the change in color due to aging deterioration, and the accuracy of adjusting the color of the image displayed by the display device 10 is improved. Note that the adjustment method in this embodiment may be modified so that the first acquisition process SA120, the first change process SA140, and the notification process SA150 are repeatedly executed until the absolute value of the difference between the color temperature obtained from the setting notification image G2 and the reference color temperature falls below a predetermined threshold.

[0038] 2. Second Embodiment Figure 5 shows an example configuration of a display device 11 according to a second embodiment of the present disclosure. The display device 11 is a projector, similar to the display device 10. In Figure 5, the same components as in Figure 2 are denoted by the same reference numerals as in Figure 2. As is clear from comparing Figure 5 and Figure 2, the hardware configuration of the display device 11 is the same as that of the display device 10. The configuration of the display device 11 differs from that of the display device 10 in that the program PRB is stored in the storage device 140 instead of the program PRA. The processing unit 110, which operates according to the program PRB, functions as a first display control unit 110a, a second reception unit 111b, a first acquisition unit 110c, a second setting unit 111d, a first modification unit 110e, and a second display control unit 110f, as shown in Figure 5.

[0039] The second reception unit 111b differs from the first reception unit 110b in that it accepts an operation to specify the operating mode of the display device 11. There are two operating modes for the display device 11: a warm mode in which the image displayed on the display surface SS has a reddish tint, and a cool mode in which the image displayed on the display surface SS has a bluish tint. Hereinafter, the operation to specify the operating mode of the display device 11 will be referred to as the mode specification operation. The mode specification operation is an example of the fourth operation in this disclosure. The warm mode is an example of the first operating mode in this disclosure. The cool mode is an example of the second operating mode in this disclosure.

[0040] The second setting unit 111d sets different color temperatures as the reference color temperature depending on whether warm mode or cool mode is specified. When warm mode is specified, the color temperature set as the reference color temperature is lower than the original white color temperature, for example, 4000K. The color temperature set as the reference color temperature when warm mode is specified is an example of a fourth color temperature in this disclosure. When cool mode is specified, the color temperature set as the reference color temperature is higher than the original white color temperature, for example, 6000K. The color temperature set as the reference color temperature when cool mode is specified is an example of a fifth color temperature in this disclosure.

[0041] Furthermore, the processing unit 110, which operates according to the program PRB, executes the adjustment method shown in Figure 6. In Figure 6, the same processes as in Figure 4 are denoted by the same reference numerals. As is clear from comparing Figure 6 and Figure 4, the adjustment method in this embodiment differs from the adjustment method in the first embodiment in the following two points. The first difference is that the second reception process SB110 is executed instead of the first reception process SA110. The second difference is that the second setting process SB130 is executed instead of the first setting process SA130.

[0042] In the second reception process SB110, the processing unit 110 functions as the second reception unit 111b. In the second reception process SB110, the processing unit 110 accepts a mode specification operation. In the second setting process SB130, the processing unit 110 functions as the second setting unit 111d. In the second setting process SB130, the processing unit 110 sets different color temperatures as the reference color temperature depending on whether warm mode or cool mode is specified based on the mode specification operation received in the second reception process SB110.

[0043] In this embodiment, in the first acquisition process SA120 following the second reception process SB110, the color temperature of the reference image G1 displayed on the display surface SS by the projection device 120 is acquired. Then, in the first modification process SA140 following the second setting process SB130, the setting color temperature, which includes setting information, is changed so that the color temperature acquired in the first acquisition process SA120 approaches the reference color temperature set in the second setting process SB130.

[0044] In this embodiment as well, similar to the first embodiment, the set color temperature is changed based on the measured color temperature of the reference image G1 displayed on the display surface SS by the projection device 120. Therefore, the set color temperature can be adjusted taking into account the change in color due to the aging deterioration of the optical system included in the projection device 120. In addition, according to this embodiment, the user can set the set color temperature to an appropriate value according to the operating mode of the display device 11 simply by specifying the operating mode of that operating mode.

[0045] 3. Third Embodiment Figure 7 shows an example configuration of a display system 1C including display devices 12A and 12B according to a third embodiment of the present disclosure. In Figure 7, the same components as in Figure 1 are denoted by the same reference numerals as in Figure 1. As is clear from comparing Figure 7 with Figure 1, the configuration of the display system 1C differs from the configuration of the display system 1A in the following two respects. The first difference is that the configuration of the display system 1C includes a display device 12A instead of a display device 10A, and a display device 12B instead of a display device 10B. The second difference is that the display devices 12A and 12B are connected to each other via a third communication line. The display devices 12A and 12B are projectors, similar to the display device 10. Hereinafter, when it is not necessary to distinguish between the display devices 12A and 12B, they will be referred to as display device 12.

[0046] Figure 8 shows an example of the configuration of the display device 12. In Figure 8, the same components as in Figure 2 are denoted by the same reference numerals as in Figure 2. As is clear from comparing Figure 8 and Figure 2, the hardware configuration of the display device 12 is the same as the hardware configuration of the display device 10. The configuration of the display device 12 differs from that of the display device 10 in that the program PRC is stored in the storage device 140 instead of the program PRA. The processing unit 110, which operates according to the program PRC, functions as a first display control unit 110a, a third reception unit 112b, a second acquisition unit 112c, a third setting unit 112d, a first modification unit 110e, and a second display control unit 110f, as shown in Figure 8.

[0047] The third reception unit 112b differs from the first reception unit 110b in that it accepts only the first operation or the third operation described above, and does not accept the second operation described above.

[0048] The second acquisition unit 112c acquires the first color temperature by analyzing the reference image G1 displayed on the display surface SS by the projection device 120 of its own device, in response to the first operation, similar to the first acquisition unit 110c. Furthermore, the second acquisition unit 112c acquires the second color temperature by analyzing the reference image G1 displayed on the display surface SS by the projection device 120 of the other display device 12B, in response to the third operation. For display device 12A, the other display device 12 refers to display device 12B, and for display device 12B, the other display device 12 refers to display device 12A. Because there may be individual differences between the projection device 120 of display device 12A and the projection device 120 of display device 12B, the first color temperature and the second color temperature may not necessarily match. The second acquisition unit 112c may acquire the first color temperature and the second color temperature in response to the first operation. In this case, the third receiving unit 112b may determine that the third operation has been received when it receives the first operation. Alternatively, the second acquisition unit 112c may acquire the second color temperature, which has been analyzed and acquired by the other display device 12, by receiving it from the other display device 12 via the third communication line.

[0049] The third setting unit 112d sets the second color temperature as the reference color temperature if the second color temperature is closer to the third color temperature determined according to the reference image signal than the first color temperature. In this embodiment, the reference image signal is a signal representing an image filled with white, and the third color temperature is the color temperature representing white, i.e., 5000K. In this embodiment, the third setting unit 112d sets the first color temperature as the reference color temperature if the first color temperature is closer to the third color temperature than the second color temperature, but it may also set the third color temperature as the reference color temperature.

[0050] Furthermore, the processing unit 110, which operates according to the program PRC, executes the adjustment method shown in Figure 9. In Figure 9, the same processes as those in Figure 3 are denoted by the same reference numerals as those in Figure 4. As is clear from comparing Figure 9 and Figure 4, the adjustment method in this embodiment differs from the adjustment method in the first embodiment in the following three points. The first difference is that the third reception process SC110 is executed instead of the first reception process SA110. The second difference is that the second acquisition process SC120 is executed instead of the first acquisition process SA120. The third difference is that the third setting process SC130 is executed instead of the first setting process SA130.

[0051] In the third reception process SC110, the processing unit 110 functions as the third reception unit 112b. In the third reception process SC110, the processing unit 110 accepts the first operation. In the second acquisition process SC120, the processing unit 110 functions as the second acquisition unit 112c. In the second acquisition process SC120, the processing unit 110 acquires the first color temperature and the second color temperature. In the third setting process SC130, the processing unit 110 functions as the third setting unit 112d. In the third setting process SC130, the processing unit 110 sets the reference color temperature to the one of the first and second color temperatures that is closer to the third color temperature.

[0052] In this embodiment as well, similar to the first embodiment, the set color temperature is changed based on the measured color temperature of the image displayed on the display surface SS by the projection device 120. This allows the set color temperature to be adjusted while taking into account changes in color due to aging deterioration of the optical system and other components included in the projection device 120. In addition, according to this embodiment, the set color temperature of one of the display devices 12A and 12B can be brought closer to the set color temperature of the other, thereby reducing the difference between the color of the image displayed by the display device 12A and the color of the image displayed by the display device 12B.

[0053] 4. Transformation The above embodiment can be modified as follows. (1) Although the display system 1A includes two display devices 10, a display device 11 may be included instead of the display devices 10. Also, the number of display devices 10 included in the display system 1A may be 1 or 3 or more. Similarly, the number of display devices 12 included in the display system 1C may be 1 or 3 or more. In addition, although the display devices 10, 11 and 12 in each of the above embodiments were projectors, any display device capable of changing the set color temperature may be used, and may be a flat panel display (FPD).

[0054] (2) In the first embodiment described above, the processing unit 110 was included in the display device 10, but the processing unit 110 may be a separate device from the display device 10, for example, the CPU of a personal computer connected to the display device 10 by wire or wireless connection. Similarly, the processing unit 110 in the second embodiment may be the CPU of a personal computer connected to the display device 11 by wire or wireless connection. Similarly, the processing unit 110 in the third embodiment may be the CPU of a personal computer connected to the display device 12 by wire or wireless connection.

[0055] (3) In the first embodiment described above, the first display control unit 110a, the first reception unit 110b, the first acquisition unit 110c, the first setting unit 110d, the first modification unit 110e, and the second display control unit 110f were software modules. However, one or more of the first display control unit 110a, the first reception unit 110b, the first acquisition unit 110c, the first setting unit 110d, the first modification unit 110e, and the second display control unit 110f, or all of them, may be hardware modules such as ASICs (Application Specific Integrated Circuits). Even if one or more of the first display control unit 110a, the first reception unit 110b, the first acquisition unit 110c, the first setting unit 110d, the first modification unit 110e, and the second display control unit 110f, or all of them, are hardware modules, the same effects as in the first embodiment described above will be achieved. Similarly, one or more, or all, of the second reception unit 111b, the third reception unit 112b, the second acquisition unit 112c, the second setting unit 111d, and the third setting unit 112d may be hardware modules.

[0056] (4) Program PRA may be manufactured separately and may be provided for a fee or free of charge. Specific ways of providing Program PRA include writing Program PRA to a computer-readable recording medium such as flash ROM and providing it, or providing Program PRA by downloading it via a telecommunications line such as the Internet. By operating a general computer according to Program PRA provided in these ways, it becomes possible to make the computer execute the color temperature adjustment method disclosed herein. Similarly, Program PRB may be manufactured separately and may be provided for a fee or free of charge. Program PRC may also be manufactured separately and may be provided for a fee or free of charge.

[0057] 5. Embodiments and aspects understood from at least one of each modified example This disclosure is not limited to the embodiments and modifications described above, and can be implemented in various forms without departing from its spirit. For example, this disclosure can also be implemented in the following forms. The technical features in the embodiments described above that correspond to the technical features in each of the forms described below can be replaced or combined as appropriate in order to solve some or all of the problems of this disclosure or to achieve some or all of the effects of this disclosure. Furthermore, if such technical features are not described as essential in this specification, they can be deleted as appropriate. A summary of this disclosure is provided below.

[0058] (Note 1) A method for adjusting the color temperature setting in a display device according to the present disclosure includes: displaying a first image based on a first image signal using the first display device; receiving a first operation from a user to instruct the measurement of the color temperature of the first image; obtaining a first color temperature by measuring the color temperature of the first image in response to the first operation; and changing the color temperature setting in the first display device so that the first color temperature approaches a reference color temperature. According to the adjustment method in (Note 1), the color temperature setting in the first display device is changed based on the measured color temperature of the image displayed on the display surface by the first display device. Since the measured color temperature of the image displayed on the display surface by the first display device reflects the change in color due to the aging deterioration of the first display device, the adjustment method in (Note 1) allows for accurate adjustment of the color of the image displayed by the display device, taking into account the aging deterioration.

[0059] (Note 2) A more preferred mode of adjustment is the adjustment method described in (Note 1), further comprising: displaying a second image based on the first image signal using a second display device; receiving a third operation from the user to instruct the measurement of the color temperature in the second image; obtaining the second color temperature by measuring the color temperature of the second image in response to the third operation; and setting the second color temperature as the reference color temperature if the second color temperature is closer to the third color temperature than the first color temperature. According to the adjustment method in (Note 2), similar to the adjustment method in (Note 1), the color tone of the image displayed by the first display device can be adjusted with high accuracy, taking into account deterioration over time. Furthermore, according to the adjustment method in (Note 2), the color tone of the image displayed by the first display device can be brought closer to the color tone of the image displayed by the second display device.

[0060] (Note 3) Another preferred mode of adjustment is the adjustment method described in (Note 1), which further includes: receiving a second operation from the user to set the reference color temperature; displaying a second image based on the first image signal using a second display device; receiving a third operation from the user to instruct the measurement of the color temperature in the second image; obtaining the second color temperature by measuring the color temperature of the second image in response to the third operation; and changing the color temperature setting value of the second display device so that the second color temperature approaches the reference color temperature. According to the adjustment method in (Note 3), similar to the adjustment method in (Note 1), the color tone of the image displayed by the first display device can be adjusted accurately, taking into account deterioration over time. Furthermore, according to the adjustment method in (Note 3), the color tone of the image displayed by the second display device can be adjusted accurately, taking into account deterioration over time.

[0061] (Note 4) A more preferred embodiment of the adjustment method is the adjustment method described in (Appendix 1) or (Appendix 3), further comprising: receiving a fourth operation from the user to specify the operating mode of the first display device; setting a fourth color temperature as the reference color temperature when a first operating mode is specified as the operating mode; and setting a fifth color temperature different from the fourth color temperature as the reference color temperature when a second operating mode different from the first operating mode is specified as the operating mode. According to the adjustment method in (Appendix 3), it becomes possible to set the reference color temperature according to the operating mode by specifying the operating mode.

[0062] (Note 5) A more preferred embodiment of the adjustment method is the adjustment method described in any of (Note 1), (Note 2), (Note 3), or (Note 4), wherein the set value of the color temperature in the first display device includes a set color temperature indicating the color temperature to be applied when the first display device displays an image, changing the set value of the color temperature in the first display device includes updating the value of the set color temperature, and the first display device displays a third image generated based on the set value of the color temperature in the first display device, and the third image includes an image indicating the set color temperature. According to the adjustment method of (Note 4), an image indicating the set color temperature changed based on the measured value of the color temperature in the displayed image can be displayed. The user of the display device can determine the set color temperature from the third image.

[0063] (Note 6) The display system of this disclosure includes a first display device that displays a first image based on an image signal, a measuring device that measures the first image, and a processing device, wherein the processing device performs the following actions: causing the first image based on the first image signal to be displayed on the first display device; receiving an operation from a user to instruct the measurement of the color temperature of the first image; obtaining a first color temperature based on the measurement result obtained by the measuring device from the first image; and changing the color temperature setting value of the first display device so that the first color temperature approaches a reference color temperature. According to the display system of (Appendix 6), the color tone of the image displayed by the first display device can be adjusted with high accuracy, taking into account deterioration over time, similar to the adjustment method of (Appendix 1). [Explanation of Symbols]

[0064] 1A, 1C...Display system, 10, 10A, 10B, 11, 12, 12A, 12B...Display device, 20...Camera, 110...Processing device, 110a...First display control unit, 110b...First reception unit, 111b...Second reception unit, 112b...Third reception unit, 110c...First acquisition unit, 112c...Second acquisition unit, 110d...First setting unit, 111d...Second setting unit, 112d...Third setting unit, 110e...First modification unit, 110f...Second display control unit, 120...Projection device, 130...Input device, 140...Storage device, PRA, PRB, PRC...Program, SS...Display surface.

Claims

1. Displaying a first image based on a first image signal representing a white image using a first display device, The system receives a first operation from the user to instruct the measurement of the color temperature in the first image, The first color temperature is obtained by measuring the color temperature of the first image in response to the first operation, Displaying a second image based on the first image signal using a second display device, The system receives a third operation from the user to instruct the measurement of the color temperature in the second image, The second color temperature is obtained by measuring the color temperature of the second image in response to the third operation, The third color temperature is 5000K. When the second color temperature is closer to the third color temperature than the first color temperature, the second color temperature is set as the reference color temperature. The color temperature setting value in the first display device is changed so that the first color temperature approaches the reference color temperature. A method for adjusting the color temperature setting in a display device, including the method described above.

2. The color temperature setting value of the first display device includes a set color temperature that indicates the color temperature applied when the first display device displays an image. Changing the color temperature setting in the first display device means This includes updating the value of the set color temperature, The first display device further includes displaying a third image generated based on the color temperature setting of the first display device, The adjustment method according to claim 1, wherein the third image includes an image showing the set color temperature.

3. A first display device that displays a first image based on an image signal, The measuring device for measuring the first image described above, Processing apparatus, including, The aforementioned processing apparatus is To display a first image based on a first image signal representing a white image on the first display device, The system accepts an operation from the user to instruct the measurement of the color temperature in the first image, Based on the measurement results obtained by the measuring device from the first image, a first color temperature is acquired. To display a second image based on the first image signal on a second display device, The system receives an instruction from the user to measure the color temperature in the second image, Based on the measurement results obtained by the measuring device from the second image, a second color temperature is acquired. The third color temperature is 5000K. When the second color temperature is closer to the third color temperature than the first color temperature, the second color temperature is set as the reference color temperature. The first color temperature is changed so that it approaches the reference color temperature, and the following is performed: Display system.

Images