JP2006013905A - Television and image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a television set and an image display device capable of optimizing color balance or the like in an image in accordance with viewer's color recognition ability. <P>SOLUTION: A CPU 41 displays a testing image in a testing mode, gradually increases the output of a color applied to the testing image on the basis of an instruction signal input by a user, acquires a rising value when a testing user can recognize a boundary between a predetermined color bars while watching the testing image and performs processing for highlighting the output of the color in image display on the basis of the acquired rising value. Consequently, it is possible to perform image display with appropriate color balance that compensates the lowness of the user's color recognition ability to the predetermined color. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a television and an image display device that perform color adjustment in accordance with the color recognition ability of a viewer.

  As a prior art, display color information is created based on color information that can be identified by a user confirmed by a color test program, and a color used when a maintenance program is executed to display a screen is displayed. There is known a color screen display device that performs display by changing to the display color (for example, see Patent Document 1).

Other prior art devices are known that apply suitable text object and background color combinations when the current color combination of the text object and background is a problematic combination (eg, patents). Reference 2).
JP 2000-330541 A Japanese Patent Laid-Open No. 2001-51761

  In the above-described conventional technology, a process of replacing a certain color with another color is performed on a specific screen displayed when executing maintenance or a Web screen divided into text and background. Such processing makes it easy to read the contents such as characters displayed on the screen for a color weak person with low color vision for a specific color. However, the color perception is low for a specific color because it may be replaced with a color that is completely different from the original color, or the part of the color that can be recognized originally may be replaced with another color because the combination of colors is changed. However, for those who look normal with respect to other colors, or for those who are slightly inferior to the color vision of a particular color, it will be a strange color scheme. In particular, if the scenery to be displayed on the TV broadcast screen or the color scheme of the person itself changes, the viewing comfort will be greatly impaired for the above-mentioned persons, and the original image will be imaged. It is also difficult to do.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a television and an image display device capable of optimizing the color balance and the like in the image according to the color recognition ability of the viewer. To do.

  In order to achieve the above object, according to the first aspect of the present invention, in a television that performs a predetermined color adjustment in accordance with the color recognition ability of a viewer at the time of image display, gradation values are varied at predetermined intervals for one color. An inspection screen display means capable of displaying a color recognition ability inspection screen comprising a plurality of color bars for each RGB, and the inspection screen display means receives the predetermined remote control operation while displaying the color recognition ability inspection screen. When the output of the color is increased, the predetermined low gradation range of the color recognition ability inspection screen for the predetermined color is displayed with the viewer displaying the boundary between the color bars gradually and clearly with the increase. Adjustment level acquisition means for acquiring an increase value when the output of the predetermined color is increased until the boundary between the color bars corresponding to can be visually recognized, and a primary color relating to the predetermined color based on the acquired increase value Signal It is constituted and a color adjusting means for increasing the force.

In the invention of claim 1 configured as described above, the television performs a predetermined color adjustment in accordance with the color recognition ability of the viewer when displaying an image.
Here, the inspection screen display means displays a color recognition capability inspection screen composed of a plurality of color bars with different gradation values at a predetermined interval for one color for each RGB. The viewer sees the inspection screen and inspects his / her color recognition ability. The inspection screen display means displays the boundary between color bars gradually and clearly when the output of the color applied to the inspection screen is increased by receiving a predetermined remote control operation while displaying the inspection screen. It has become. Therefore, the adjustment level acquisition means increases the output of the predetermined color until the viewer can visually recognize the boundary between the color bars corresponding to the predetermined low gradation range of the color recognition ability inspection screen for the predetermined color. Get the rising value.

  The larger the acquired increase value, the lower the color perception of the predetermined color of the viewer who has been inspected by the screen. The color adjusting means performs processing for increasing the output value of the primary color signal relating to the predetermined color based on the acquired increase value. As a result, a certain RGB color in the television image is emphasized according to the degree of color recognition ability of the viewer for that color. Therefore, an image can be displayed with a color balance that matches a person's color recognition ability, even for a color weak person who has a low color recognition ability for a specific color or is difficult to distinguish a confusing color. .

  According to a second aspect of the present invention, there is provided an image display apparatus for performing a predetermined color adjustment in accordance with a viewer's color recognition capability, and a color recognition capability test for determining the degree of the viewer's color recognition capability for each predetermined element color. An inspection screen display means for displaying a screen; an adjustment value acquisition means for acquiring a color adjustment value for a predetermined element color based on a result of a color recognition ability inspection performed by a predetermined operation on the inspection screen display means; And a color adjusting means for performing processing for emphasizing the predetermined element color in the image display in accordance with the acquired color adjustment value.

In the invention of claim 2 configured as described above, the image display device performs a predetermined color adjustment in accordance with the color recognition ability of the viewer.
Here, the inspection screen display means displays a color recognition capability inspection screen for determining the degree of color recognition capability of the viewer for each predetermined element color. The adjustment value acquisition unit acquires a color adjustment value for a predetermined element color based on a result of the color recognition capability inspection performed by a predetermined operation on the inspection screen display unit. Then, the color adjustment unit performs processing for emphasizing the predetermined element color in the image display according to the acquired color adjustment value.

  In other words, colors having element colors in the image are emphasized according to the degree of color recognition ability of the viewer for that color. Images can be displayed with a color balance that matches the ability.

  According to a third aspect of the present invention, in the image display device according to the second aspect, the inspection screen display means displays a screen composed of a plurality of color bars with different gradation values at a predetermined interval for one element color for each RGB. It is configured to be displayed on the screen. If the above aspect is used as an example of the inspection screen to be displayed, the viewer who performs the inspection is suitable for grasping the color recognition ability for a certain color.

  According to a fourth aspect of the present invention, in the image display device according to the third aspect, the adjustment value acquisition means outputs the element color relating to the inspection screen while the inspection screen display means displays the color recognition ability inspection screen. In the state where the boundary between the color bars is gradually and clearly displayed with the increase, the color of the element color is changed until the viewer can visually recognize the boundary between the predetermined color bars of the inspection screen for the predetermined element color. An increase value when the output is increased is acquired, and the color adjustment unit is configured to increase the output value of the primary color signal relating to the element color based on the acquired increase value.

  In the invention of claim 4 configured as described above, when the inspection screen display means increases the output of the element color applied to the inspection screen while displaying the color recognition capability inspection screen, the color bar is displayed along with the increase. The boundary between them is gradually and clearly displayed. When the viewer has low color recognition ability for a certain element color, it is difficult for the viewer to visually recognize the boundary of the color bar group related to the same color. Therefore, the adjustment value acquisition means acquires an increase value when the output of the element color is increased until the viewer can visually recognize the boundary between the predetermined color bars of the inspection screen relating to the predetermined element color. The color adjusting means increases the output value of the primary color signal related to the element color based on the acquired increase value. As a result, the same element color in the image is enhanced to such an extent that the viewer can visually recognize it, so that an image having a color balance suitable for the viewer's color recognition ability can be displayed.

  Among the boundaries between the color bars, the boundary between the color bars having originally low gradation values is particularly difficult to visually recognize. Therefore, the adjustment value acquisition means calculates an increase value when the output of the element color is increased until the viewer can visually recognize the boundary between the color bars corresponding to the predetermined low gradation range of the color recognition ability inspection screen. It may be acquired. In this way, it is possible to reliably acquire an increase value necessary for the viewer to be able to visually recognize a predetermined element color comfortably.

According to a sixth aspect of the present invention, in the image display device according to any one of the second to fifth aspects, the adjustment value acquisition unit stores the acquired color adjustment value as personal data for each viewer. The color adjusting means is configured to execute color adjustment based on the personal data of the viewer specified by the instruction signal when a predetermined instruction signal specifying the viewer is input.
Since there are various viewers using the image display device, the color adjustment value may be stored as personal data for each viewer. When displaying an image, color adjustment based on personal data of the viewer at that time is performed. As a result, it is possible to prevent viewing comfort from being impaired by looking at an image that has been color-adjusted with the setting of another person with different color recognition capabilities. In addition, each viewer does not need to perform their own inspection every time.

According to a seventh aspect of the present invention, in the image display device according to any one of the second to sixth aspects, when the color recognition capability for all element colors is substantially inferior to a predetermined standard, the video signal The luminance is increased to a predetermined value.
The process of emphasizing each element color individually may be performed as before, but if the color recognition ability for all element colors is low as a result of the color recognition ability test, the brightness of the video signal May be raised to a predetermined value. As a result, since the entire screen becomes bright, it is easy for the person as described above to see the image.

  As described above, according to the present invention, a color that is difficult to visually recognize according to the color recognition ability of each viewer is emphasized in the image display. It is possible to view an image with an optimal color balance in which the low ability is compensated.

FIG. 1 shows a schematic configuration of a television according to an embodiment of the present invention.
As shown in the figure, the television 100 generally includes a tuner 10, a color reproduction circuit 20, a CRT 30, and a microcomputer 40. In this configuration, the microcomputer 40 is connected to each part constituting the television 100 via the IIC bus 70, and the CPU 41 controls the entire television 100 using the RAM 43 as a work area according to the program and data written in the ROM 42. . An operation panel 44 and a remote control I / F 45 are connected to the microcomputer 40. Depending on an input signal through the operation panel 44 or an input signal from the remote control through the remote control I / F 45, Various processes in the television 100 can be controlled.

  The tuner 10 receives a television broadcast signal via the antenna 10a under the control of the microcomputer 40. Then, the tuner 10 extracts a composite video signal as an intermediate frequency signal from the television broadcast signal while performing predetermined signal amplification processing and the like, and outputs it to the color reproduction circuit 20. The Y / C separation circuit 22 of the color reproduction circuit 20 performs separation into a luminance signal and a chroma signal based on the composite video signal. The separated luminance signal is input to the image quality adjustment circuit 23, subjected to predetermined adjustment such as signal amplification processing, and then output to the matrix circuit 25. On the other hand, the separated chroma signal is demodulated into RY and BY color difference signals (UV signals) in the color demodulation circuit 24 and then output to the matrix circuit 25.

  The matrix circuit 25 performs matrix conversion processing based on the input luminance signal and color difference signal, and generates R (red), G (green), and B (blue) primary color signals. The R, G, and B signals generated in this way are subjected to predetermined amplification processing in the R amplifier circuit 51, G amplifier circuit 52, and B amplifier circuit 53 each composed of a transistor, a variable resistor, and the like, and then the CRT 30 The image display is realized by controlling the amount of the electron beam applied to and emitted from each cathode electrode R31, cathode electrode G32, and cathode electrode B33.

  Although not shown, in the television 100, a predetermined deflection circuit drives the electron beam in the horizontal and vertical directions based on the horizontal and vertical drive signals extracted from the television broadcast signal. In the above description, it is assumed that A / D and D / A conversion of electrical signals is performed as necessary.

  In the above configuration, in the present embodiment, an inspection mode for inspecting the color recognition ability (color vision) of a user who intends to view a broadcast program or the like on the television 100 is provided. In the inspection mode, the user's degree of color recognition ability for each color of RGB is inspected, and the color balance in image display is adjusted based on the user's color recognition ability obtained by the inspection.

FIG. 2 shows an example of an inspection screen displayed in the inspection mode.
The inspection screen (R inspection screen) includes a plurality of color bars arranged side by side. Each color bar has a density corresponding to a gradation value that changes at a predetermined interval within a predetermined gradation range (for example, 0 to 255 gradations). In FIG. The concentration is rising. In the figure, it is assumed that each color bar is an R single color bar (white at the right end). In the present embodiment, image data for displaying each R, G, B inspection screen is stored in the ROM 42, and when the CPU 41 detects that the inspection mode is selected, the above-mentioned inspection data is displayed. The screen is sequentially displayed on the CRT 30 using an OSD (on-screen display) function or the like for each RGB.

  In the present embodiment, the above-described inspection screen is distinguished from each color bar when viewed by a user who does not have a color vision abnormality such as color weakness under a condition where standard luminance adjustment is performed. The setting is such that the density is different enough to recognize the boundary (initial setting). Further, by gradually increasing the color output on the inspection screen and making each color bar brighter, the boundaries between the color bars become clearer. Here, if the user is weak in color who is weak in recognizing the color applied to the inspection screen, the boundary between the color bars, particularly the low gradation range, can be seen even if the initial inspection screen is viewed. The boundary between the corresponding color bars is difficult to recognize. Therefore, in the present invention, the degree of color recognition ability of the user for a predetermined color is determined based on the level at which the boundary between the color bars can be recognized.

FIG. 3 is a flowchart showing the processing contents of the program executed by the CPU 41 in the inspection mode.
A user who wants to perform an inspection inputs an instruction signal for selecting an inspection mode from a predetermined menu by operating the operation panel 44 or a remote controller. In step 100, the CPU 41 determines whether or not an instruction signal for the inspection mode has been input. If the input has been received, the CPU 41 executes the processing from step 110 onward.

In step S110, as described above, the inspection screen for one of RGB colors is displayed on the CRT 30.
In step S120, based on the instruction signal input by the user, the color output on the inspection screen is increased stepwise. The user inputs the instruction signal to the television 100 by a predetermined remote control operation or the like.

  When the displayed inspection screen is, for example, an R inspection screen, the CPU 41 that has received the instruction signal gradually increases the amount of the electron beam from the cathode electrode R31. Raise the bottom in stages. As a result, the brightness of each color bar gradually increases in real time on the R inspection screen. In addition, since there is no color vision abnormality with respect to the color applied to the screen for the inspection, there is a case where the user does not input the instruction signal at all and does not change the screen.

  In step S130, the CPU 41 obtains an increase value of the color output of the inspection screen. That is, a user who performs inspection while looking at the inspection screen can recognize a boundary between predetermined color bars (for example, between the rightmost color bar corresponding to the low gradation range and the second color bar from the right). When the brightness of each color bar is increased until it appears, press a predetermined enter key. Then, the CPU 41 obtains an increase value at the time when the signal relating to the determination key is input. Here, the voltage obtained by raising the R signal is assumed to be the increase value. The increase value becomes higher as the color recognition ability of the color applied to the inspection screen becomes lower due to color weakness or the like, whereas the user who has no color vision abnormality basically becomes 0 or a value close thereto. A predetermined limit may be set for the increase value.

In step S140, the acquired increase value is stored in a predetermined storage area. At this time, the user may input personal identification information and store it as personal information in association with the identification information.
In step S150, it is determined whether or not the increase value is stored for all the colors of RGB. If there is a color that does not store the increase value, the color of the inspection screen in the CRT 30 is changed and the above processing is performed. repeat. On the other hand, when the increase values have been stored for all RGB, the inspection mode processing for a certain user is terminated.

FIG. 4 is a flowchart showing the color adjustment processing executed by the CPU 41. The CPU 41 adjusts the color balance during actual image display based on the increased values for each RGB acquired as described above.
In step S200, based on the user identification information input via the operation panel 44 or the remote control I / F 45, the personal information (increase value for each RGB) of the specific user is acquired from the predetermined storage area.

  In step S210, the CPU 41 controls the R amplifier circuit 51, the G amplifier circuit 52, and the B amplifier circuit 53 in accordance with the magnitude of the acquired increase value, and adjusts the voltage value of the primary color signal for each RGB. For example, in step S200, an increase value that is a predetermined value is obtained for R, and when the increase value is 0 for G and B, a DC voltage (adjustment voltage) is set to raise the entire level of the R signal. Processing such as addition is performed in the R amplifier circuit 51. As a result, the potential of the cathode electrode R31 is generally lower than the potentials of the cathode electrode G32 and the cathode electrode B33 (the input voltage to the cathode electrode is negative), and the amount of beam from the cathode electrode R31 increases. The color development of R is stronger than G and B.

  As a result of the inspection, if there are a plurality of colors with low color recognition capabilities, in step S210, a control process for individually enhancing the color development is performed for the plurality of colors. Here, the relationship between the magnitude of the acquired increase value and the adjustment voltage used in step S210 may be determined in advance as a table, stored in a predetermined storage area, and read as appropriate, or the increase value may be used as the adjustment voltage as it is. It may be used.

  In step S210, as shown below, the balance of the amount of electron beams from the cathode electrode R31, the cathode electrode G32, and the cathode electrode B33 is adjusted based on the ratio of the increase values for each RGB acquired in step S200. good. The CPU 41 has an RGB electron beam amount ratio (reference ratio R: G: B, for example, 34:34:32) as a reference for realizing an appropriate white balance, and executes the above color adjustment. Otherwise, when displaying white, the RGB cathode voltages are adjusted so that the ratio of the amount of electron beams of each color becomes the reference ratio. Here, when the increase values for each of RGB are obtained as Dr, Dg, and Db (Dr, Dg, Db ≧ 0), the reference ratio is corrected based on the ratio between Dr, Dg, and Db.

  The reference ratio is corrected as follows, for example. Multiplying the increase values Dr, Dg, Db by a constant α, the color balance adjustment values α × Dr, α × Dg, α × Db are obtained. Then, α × Dr, α × Dg, and α × Db are added to the reference ratio, respectively, and a correction ratio R + α × Dr: G + α × Dg: B + α × Db = R1: G1: B1 is obtained. If the correction ratio remains unchanged, the sum of R1, G1, and B1 exceeds 100. Therefore, R1, G1, and B1 are multiplied by 100 / (R1 + G1 + B1), respectively, so that the total becomes 100, and the final correction ratio R2: G2: Get B2. Note that the constant α is such that the difference between each numerical value of the final correction ratio and each numerical value of the reference ratio is within a predetermined range (for example, the difference between R and R2, the difference between G and G2, and the difference between B and B2 are −10 to 10 respectively. Set to +10).

  Then, the voltages of the cathode electrode R31, the cathode electrode G32, and the cathode electrode B33 are set to the R amplifier circuit 51, the G amplifier circuit 52, and the B electrode so that the ratio of the RGB electron beam amounts when displaying white becomes the final correction ratio. Adjustment is performed under the control of the amplifier circuit 53. This method also enhances the color development for a color having a high increase value in the image.

  As described above, according to the present invention, among the RGB colors that have a weak color recognition capability of the user, the colors are emphasized more than other colors in the image display. As a result, for users including those with weak color vision for specific colors, colors with weak color recognition ability can be viewed almost the same as other colors, and the color balance of the image is suitable for the user. It will be a thing. Therefore, even the color weak person can recognize the color scheme and hue that the video signal originally intends to express.

  In addition, the test result is stored as personal data, and the color adjustment is performed by selecting personal information based on the identification information of the user. Therefore, for each user who wants to watch the television 100 at that time, A suitable color balance is achieved. At the same time, it is possible to prevent viewing comfort from being impaired by viewing an image color-adjusted with the setting of another person with different color recognition capabilities.

  If substantially the same increase value is obtained for all the colors RGB as a result of the inspection, the screen brightness may be increased to a predetermined value. As an example of the technique, the voltage of each cathode electrode is controlled so that the beam amounts from the cathode electrode R31, the cathode electrode G32, and the cathode electrode B33 increase uniformly. As a result, the brightness of the screen increases, so that it is easy to recognize each color of the image for those who have the same low color recognition ability for all the colors of RGB.

Another embodiment will be described.
When the inspection screen is displayed, the UV signal may be adjusted as a method for sharpening the boundary between the color bars. The CPU 41 may perform a process of increasing the output level of the V signal that is the RY signal by controlling the color demodulation circuit 24 when the R inspection screen is displayed. In this case, red is emphasized as a whole on the screen, and the boundary between the color bars gradually becomes clear. Therefore, the user increases the output level of the V signal by operating the remote controller or the like, and causes the CPU 41 to store an increase value of the output level when the boundary between predetermined color bars becomes clear. Then, when the user views on the television 100 thereafter, the CPU 41 performs a process of increasing the output level of the V signal by the increased value. As a result, since the color of R is emphasized for a user with low R color recognition capability, it is possible to display an image with a color balance suitable for the user.

  Similarly, the CPU 41 may perform a process of increasing the output level of the U signal that is the BY signal when the B inspection screen is displayed. In this case, since the color tone of the screen is entirely emphasized in blue and the boundary between the color bars becomes clear, the user increases the output level of the U signal and the boundary between the predetermined color bars is clear. The CPU 41 stores the increase value of the output level when the value becomes. Then, output adjustment is executed using the increased value when the user views. As a result, since the color of B is emphasized, it is possible to display an image with a color balance suitable for a user with low B color recognition ability.

  Furthermore, the display as the inspection screen is not limited to the above. For example, the inspection screen can be a color bar group of graduation that gradually changes from R to B with complementary magenta. In this case, the color of the color bar at one of the left and right ends is set to B having a predetermined density, and the color at the other end is set to R having a predetermined density. The user adjusts the output of the UV signal by operating a remote controller while viewing the inspection screen. In other words, if the entire inspection image surface feels red, the output level of the U signal is increased, and the increase value of the output level when the B bar at the end can be recognized as standard blue. The CPU 41 stores it. On the other hand, if the entire screen feels bluish, the output level of the V signal is increased, and the increase value of the output level when the R bar at the end is recognized as standard red is stored in the CPU 41. Let Thereafter, when the user views on the television 100, a process of adjusting the output level of the UV signal by the stored increase value is performed. As a result, it is possible to display an image with a hue that compensates for the low color recognition capability for a user with low R or B color recognition capability.

In the above description, the CRT 30 is used as a display, but a liquid crystal panel can be used instead. The enhancement processing for each RGB when using a liquid crystal panel is realized by adjusting the output of the backlight. On the back surface of the liquid crystal panel in which a plurality of pixels corresponding to RGB are arranged in a matrix, a light emitting element body corresponding to each pixel of the liquid crystal panel is arranged in a matrix as a backlight unit. Therefore, when emphasizing a predetermined color to supplement the user's color recognition ability, the light emission luminance of the light emitting element body arranged corresponding to the same color pixel is set to the increased value obtained as a result of the inspection. Accordingly, it may be increased at a predetermined rate. As a result, the same color is displayed brighter than the other colors, and an image having an appropriate color balance can be displayed for a user having a low color recognition capability for the same color.
In the above inspection, when the inspection screen for a certain color is displayed, the boundary between the color bars may be gradually clarified by increasing the light emission luminance of the light emitting element corresponding to the same color. In this case, pixels corresponding to the same color are irradiated in the subsequent image display with the light emission luminance when the boundary becomes clear.

It is a schematic block diagram of the television concerning one Embodiment of this invention. It is explanatory drawing which showed the screen for a test | inspection. It is the flowchart which showed the processing content performed in test | inspection mode. It is the flowchart which showed the processing content of the color adjustment.

Explanation of symbols

10 ... Tuner 20 ... Color reproduction circuit 30 ... CRT
40 ... microcomputer 51 ... R amplifier circuit 52 ... G amplifier circuit 53 ... B amplifier circuit 100 ... television

Claims (7)

In a television that performs a predetermined color adjustment according to the viewer's color recognition ability when displaying an image,
Inspection screen display means capable of displaying, for each RGB, a color recognition capability inspection screen composed of a plurality of color bars with different gradation values at a predetermined interval for one color;
When the above-mentioned inspection screen display means displays a color recognition ability inspection screen and receives a predetermined remote control operation to increase the color output on the inspection screen, the boundary between the color bars gradually becomes clear with the increase. Increase when the output of the predetermined color is increased until the viewer can visually recognize the boundary between the color bars corresponding to the predetermined low gradation range of the color recognition ability inspection screen for the predetermined color. Adjustment level acquisition means for acquiring a value;
A television comprising: color adjusting means for increasing the output of the primary color signal for the predetermined color based on the acquired increase value. In an image display device that performs a predetermined color adjustment in accordance with the color recognition ability of a viewer,
Inspection screen display means for displaying a color recognition capability inspection screen for judging the degree of color recognition capability of the viewer for each predetermined element color;
An adjustment value acquisition means for acquiring a color adjustment value for a predetermined element color based on a result of a color recognition ability inspection performed by a predetermined operation on the inspection screen display means;
An image display device comprising: color adjusting means for performing processing for emphasizing the predetermined element color in image display in accordance with the acquired color adjustment value.   3. The image display device according to claim 2, wherein the inspection screen display means displays a screen composed of a plurality of color bars with different gradation values at a predetermined interval for one element color for each RGB. The adjustment value acquisition means gradually clears the boundary between the color bars when the inspection screen display means increases the output of the element color applied to the inspection screen while displaying the color recognition ability inspection screen. In the state of display, obtain an increase value when the output of the same element color is increased until the viewer can visually recognize the boundary between the predetermined color bars of the inspection screen relating to the predetermined element color;
The image display device according to claim 3, wherein the color adjustment unit increases an output value of a primary color signal related to the element color based on the acquired increase value.   The adjustment value acquisition means acquires an increase value when the output of the element color is increased until the viewer can visually recognize a boundary between color bars corresponding to a predetermined low gradation range on the color recognition ability inspection screen. The image display device according to claim 4.   The adjustment value acquisition unit stores the acquired color adjustment value as personal data for each viewer, and the color adjustment unit is specified by the instruction signal when a predetermined instruction signal for specifying the viewer is input. 6. The image display device according to claim 2, wherein color adjustment is executed based on personal data of the viewer.   7. The luminance of a video signal is increased to a predetermined value when the color recognition ability for all element colors is substantially inferior to a predetermined standard. The image display device described in 1.

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