JP4292135B2 - Image display device - Google Patents

Description

The present invention relates to a color adjustment technique in an image display apparatus.

With the development of multimedia technology, anyone can handle video information relatively easily, such as editing a VTR using a personal computer. Video sources are diversified, and various video sources such as DVDs, VTRs, satellite broadcasts, and personal computers are displayed on a display device such as a television or personal computer monitor. The barrier of displaying on a monitor is disappearing.
By the way, as for transmission of video signals, luminance and color signals (or color difference signals) are generally used for television images mainly including natural images, and RGB signals are generally used for personal computer output. Color adjustment is mainly performed in hue and saturation adjustment based on color signals in a television receiver, and individual RGB color adjustment is mainly performed in a personal computer monitor.

In recent personal computers, not only characters and graphics but also natural image display has become commonplace. When displaying natural images, there is a demand for adjusting the hue and saturation as if they were television.
On the other hand, for example, Adobe's image retouching software “PhotoShop” has a color adjustment mode, and can select RGB adjustment and adjustment of luminance, hue, and color difference, and perform data conversion on the target image file. Is going.

  However, in the above known example, the above-mentioned software itself is necessary for the hue adjustment, and there is a problem that it is difficult to adjust the hue for various display images in general.

An object of the present invention is to provide a technique capable of suitably performing color adjustment .

According to the present invention, in an image display device, a first signal conversion unit that converts an input image signal into a luminance signal, a hue signal, and a saturation signal and outputs the signal, and a hue signal output from the first signal conversion unit is changed. A first color adjusting unit including a hue adjusting unit that adjusts a hue and a saturation adjusting unit that performs a saturation adjustment by changing a saturation signal output from the first signal converting unit; The hue signal adjusted by the hue adjusting unit in the color adjusting unit, the saturation signal adjusted by the saturation adjusting unit in the first color adjusting unit, and the luminance signal output from the first signal converting unit are RGB Second signal conversion means for converting and outputting the three primary color signals, and second color adjustment means capable of individually adjusting the signals of the three primary color signals output from the second signal conversion means, The second With No. display device that displays an image based on the three primary color signals output from the conversion means, and a switching means for switching between adjustment by adjusting the second color adjusting unit according to the first color adjusting means,
A first image based on a signal whose hue and saturation are adjusted by the first color adjusting means; and a second image based on a signal whose at least one of the three primary color signals is adjusted by the second color adjusting means. Both can be displayed on the screen of the display device.

According to the present invention, in the image display device, a first signal converting unit that converts an input image signal into a luminance signal, a hue signal, and a saturation signal and outputs the converted signal, and a hue signal output from the first signal converting unit is changed. A first color adjusting unit including a hue adjusting unit that adjusts a hue by adjusting the saturation signal output from the first signal converting unit, and a saturation adjusting unit that performs a saturation adjustment by changing the saturation signal output from the first signal converting unit. The hue signal adjusted by the hue adjusting unit in one color adjusting unit, the saturation signal adjusted by the saturation adjusting unit in the first color adjusting unit, and the luminance signal output from the first signal converting unit. Second signal conversion means for converting to RGB three primary color signals and outputting; and second color adjustment means capable of individually adjusting the signals of the three primary color signals output from the second signal conversion means; The above Comprising a display device that displays an image based on the three primary color signals output from the second signal converting means, and switching means, the,
The switching means uses the first color adjustment means for either the first image or the second image when both the first image and the second image are displayed on the screen of the display device. The color adjustment is performed, and a switching operation is performed so that the other color is adjusted using the second color adjustment unit .

Furthermore, the present invention provides a first signal converting means for converting an input image signal into a luminance signal, a hue signal and a saturation signal and outputting the first image signal in an image display device capable of displaying personal computer video and television video. A hue adjusting means for adjusting the hue by adjusting the hue signal output from the converting means; and a saturation for adjusting the saturation by adjusting the saturation signal output from the first signal converting means. A first color adjusting means including a degree adjusting means, a hue signal adjusted by the hue adjusting means in the first color adjusting means, a saturation signal adjusted by the saturation adjusting means in the first color adjusting means, And a second signal converting means for converting the luminance signal output from the first signal converting means into RGB three primary color signals and outputting the RGB signals, and the three primary color signals output from the second signal converting means. With each color signal and a second color adjustment means for individually adjustable, and a display device that displays an image based on the three primary color signals output from said second signal converting means,
When both the television video and the personal computer video are displayed on the display screen of the display device, the television video can be color-adjusted by the first color adjusting means, and the personal computer video can be color-adjusted by the second color adjusting means. It is characterized by that.

According to the present invention, it is possible to adjust the hue even when RGB signals are input.

Hereinafter, embodiments of the present invention will be described with reference to the drawings using some examples. FIG. 1 is a block diagram showing a first embodiment of a liquid crystal display device according to the present invention. In the figure, 1 is a signal source, 2 is a matrix circuit that converts a primary color signal (RGB signal) into a luminance signal Y and a color difference signal (BY signal, RY signal), 3 is a hue detection circuit, and 4 is saturation. Detection circuits 5, 5 and 6 are multiplication circuits, 7 and 8 are addition circuits, 9 to 12 are registers, 13 is a color difference reproduction circuit, 14 and 15 are multiplication circuits, and 16 is a luminance signal Y and a color difference signal converted into primary color signals. A matrix circuit, 17 to 19 are multiplication circuits, 20 to 22 are addition circuits, 23 to 28 are registers, and 29 is a display device. The registers 9 to 12 are constituted by a RAM or the like, and the values of the registers 9 to 12 are rewritten according to a command from the microcomputer.

  A configuration example of each block in FIG. 1 will be described below. The matrix circuit 2 can be realized, for example, with the configuration of FIG. FIG. 2 is a block diagram showing an embodiment of a matrix circuit for inputting a color signal and outputting a luminance signal and a color difference signal. In the figure, 30 to 33 are multipliers, 34 to 37 are adders, and 38 to 41 are coefficient multipliers. The RGB signals applied to the terminals 42 to 44 are multiplied by coefficients output from the coefficient units 38 to 40 by multipliers 30 to 32, respectively. The R signal and G signal multiplied by these coefficients are added by an adder 34, and the output of the adder 34 and the B signal are added by an adder 35, whereby a luminance signal Y is generated. The R-Y signal is obtained by adding the R signal applied to the terminal 42 to the negative luminance signal -Y obtained by multiplying the multiplier 33 by the coefficient -1 output from the coefficient unit 41 by the adder 36. Generated. The BY signal can be generated by adding the minus luminance signal -Y, which is the output of the multiplier 33, to the B signal applied to the terminal 44.

  The matrix circuit 16 can be realized, for example, with the configuration shown in FIG. FIG. 3 is a block diagram showing an embodiment of a matrix circuit that inputs luminance and color difference signals and outputs color signals. In the figure, 45 to 47 are multipliers, 48 to 51 are adders, and 52 to 54 are coefficient multipliers. The Y signal, the RY signal, and the BY signal applied to the terminals 55 to 57 are respectively multiplied by the coefficients output from the coefficient units 52 to 54 by the multipliers 45 to 47, respectively. The luminance signal Y applied to the terminal 55 by the adder 48 and the RY signal applied to the terminal 56 are added, and the output of the adder 48 and the BY signal are added by the adder 49, whereby G A signal is generated. The adder 50 adds the luminance signal Y to the RY signal applied to the terminal 56 to generate an R signal, and the adder 51 adds the luminance signal Y to the BY signal applied to the terminal 57. By doing so, a B signal is generated.

The hue detection circuit 3 can be realized, for example, with a configuration as shown in FIG.
FIG. 4 is a block diagram showing an embodiment of the hue detection circuit. In the figure, reference numeral 60 is a division circuit, and 61 is a circuit for obtaining an inverse trigonometric function of tan (hereinafter referred to as an ATRAN circuit). Each of the division circuit 60 and the ATRAN circuit 61 can be easily realized by a table reference method using a LUT (Look Up Table) (not shown).

  On the other hand, the saturation detection circuit 4 can be realized, for example, with a configuration as shown in FIG. FIG. 5 is a block diagram showing an embodiment of the saturation detection circuit. In the figure, reference numerals 62 and 63 denote multiplication circuits, and reference numeral 64 denotes a square root circuit (hereinafter referred to as a ROOT circuit). The multiplier circuit 62 squares the RY signal, and the multiplier circuit 63 squares the BY signal. Saturation is obtained by supplying the outputs of the multiplication circuits 62 and 63 to the square root circuit 64 and taking the square root of the sum thereof.

  The multiplication circuits 62 and 63 and the ROOT circuit 64 can be easily realized by a table reference method using an LUT (not shown).

  FIG. 6 shows the relationship between the BY signal, the RY signal, hue, and saturation. FIG. 6 is a characteristic diagram for explaining the relationship between hue and saturation. The horizontal axis (x axis) represents the level of the BY signal, and the vertical axis (y axis) represents the level of the RY signal. . The vector sum of the BY signal and the RY signal is a vector representing hue and saturation, the angle θ is the hue, and the magnitude S is the saturation. That is, the hue θ can be obtained from the equation 1, and the saturation S can be obtained from the equation 2.

  FIG. 7 is a characteristic diagram showing the hue and normalized level of the color difference signal. The color difference reproduction circuit 13 can also be realized by an LUT, for example, and its input / output characteristics are trigonometric functions as shown in FIG. FIG. 7 shows the angle θ on the horizontal axis and the normalized value R of the level on the vertical axis. The BY signal is a Cos function with respect to the input θ and is shown by a curve 65, and the RY signal is a Sin function and is shown by a curve 66.

  Next, the operation of FIG. 1 will be described. The RGB signal output from the signal source 1 is converted into a Y signal, a BY signal, and an RY signal by the matrix circuit 2, and the BY signal and the RY signal are a hue detection circuit 3 and a saturation detection circuit 4. And converted into hue θ and saturation S. The hue θ is added to the value of the register 11 by the adding circuit 7 to obtain a hue θ ′, and the hue is changed by the value of the register 11. The saturation S is multiplied by the value of the register 10 by the multiplication circuit 6 to become the saturation S ′, and the saturation is changed by the value of the register 6. Note that the values of the registers 10 and 11 are changed according to a command from a microcomputer (not shown) according to the instruction of the viewer.

  The changed hue θ ′ is input to the color difference reproduction circuit 13, the value of the Cos function corresponding to θ ′ is output as a BY signal, and the value of the Sin function corresponding to θ ′ is output as an RY signal. The output is multiplied by the saturation S ′ that has been varied by the multiplication circuits 14 and 15. The BY output and RY output of the color difference reproduction circuit 13 are normalized values, and the true B to be reproduced is determined by determining the magnitude of the BY signal and the RY signal by the saturation S ′. -Y signal and RY signal are generated. On the other hand, the luminance signal Y is input to the matrix circuit 16 after the amplitude is adjusted by the register 9 in the multiplier circuit 5 and the direct current level is adjusted by the register 12 in the adder circuit 8.

  The matrix circuit 16 generates RGB signals from the luminance signal Y and the color difference signals BY and RY. In the subsequent stage of the matrix circuit 16, the multiplier circuits 17 to 19 and the adder circuits 20 to 22 are made variable by the registers 23 to 28 so that the amplitude and the direct current level can be adjusted for each of the RGB signals. A circuit provided between the matrix circuit 16 and the display device 29 is usually provided in a signal circuit that inputs RGB, and in this circuit, when the hue and saturation are adjusted, the luminance changes. However, by converting the RGB signal into a luminance signal and a color difference signal, the hue and saturation can be changed with almost no change in luminance.

  In the above configuration, the primary color signal can be converted into the hue signal by the matrix circuit 2 and the hue detection circuit 3. The primary color signal can be converted into a saturation signal by the matrix circuit 2 and the saturation detection circuit 4. The signal processed as described above is input to the display device 29 and displayed. Any display device may be used as long as it has an RGB input such as a cathode ray tube display device, a liquid crystal display device, or a plasma display device.

  As described above, according to the configuration of the present embodiment, the hues and saturations can be adjusted by the registers 11 and 10 and the luminance can be adjusted by the registers 9 and 12 with respect to the same input from the signal source 1 and RGB can be adjusted by the registers 23 to 28 Amplitude and DC level can be adjusted separately.

  When a personal computer is connected as the signal source 1, for example, the display content includes not only characters and graphics but also still images and moving images of natural images. In the case of only characters and graphics, it is possible to achieve a desired color tone only by adjusting each of RGB as in the past, but in the case of a natural image, it is difficult to achieve a desired color tone by independent adjustment of RGB. In natural image display, you have to rely on the adjustment of hue and saturation to make the skin color a little pink.

  According to this configuration, it is possible to select whether to adjust the hue and saturation by adjusting the registers 9 to 12 or to adjust the RGB by adjusting the registers 23 to 28 according to the user's request. Adjustment becomes very convenient.

  Hereinafter, a second embodiment of the image display device according to the present invention will be described with reference to FIG. FIG. 8 is a block diagram showing a second embodiment of the image display apparatus according to the present invention. In FIG. 8, the RGB signal source 1 from the personal computer described in the first embodiment and the signal source 71 of the luminance signal, RY signal, and BY signal are switched by a switching circuit (hereinafter referred to as SEL) 70. I am trying to do it. Blocks having the same functions as those in FIG. The signal source 71 has an output signal format having luminance Y and color difference signals BY and RY, such as DVD player output, satellite broadcast set-top box output, or digital camera output. Note that the color difference signals BY and RY are shown separately, but depending on the signal source, the color difference signals BY and RY may be time-division multiplexed, and not necessarily the BY signal. The wiring of the RY signal is not separated.

  The feature of this embodiment is that either the signal source 1 having RGB output such as a personal computer or the signal source 71 having luminance and color difference can be freely selected according to the user's request from hue / saturation adjustment or RGB individual adjustment. In addition, it is possible to eliminate the inconvenience of only the hue and saturation adjustment for television images and the RGB adjustment for personal computer signals as in the prior art. Since the signal processing and operation after SEL 70 have been described in the first embodiment, they are omitted here.

Hereinafter, a third embodiment of the present invention will be described with reference to FIG. FIG. 9 is a block diagram showing a third embodiment of the image display apparatus according to the present invention. 9 is provided with switching means 72 to 79 in the block diagram of FIG. 1, and the switching control circuit 80 controls the switching means 72 to 79 so that the respective adjustment values are switched over time. The same blocks as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. The switching control in FIG. 9 is performed when screen B is inserted into screen A as shown in FIG.

  FIG. 10 is a front view of the display when another screen is fitted on the screen. FIG. 11 is a front view of the display when two screens are fitted on the screen. In FIG. 10, RGB adjustment is performed in the area of screen A, and hue and saturation adjustment (referred to as YSH adjustment) is performed in the area of screen B. On a personal computer screen, natural images are often displayed with characters and graphics inserted, and with this configuration, character graphics can be adjusted with RGB and natural images can be adjusted with YSH.

  The switching means 72 to 79 in FIG. 9 switch the selection target to either a register value or a fixed value of “1” or “0”, respectively. For example, when a signal “1” is output from the switching control circuit 80, the switching means 72 and 73 are respectively tilted (connected) to the fixed value side, and the adder circuit 7 sets “0” to the output of the hue detection circuit 3. The multiplication circuit 6 multiplies the output of the saturation detection circuit 4 by “1”. That is, neither hue nor saturation is variable.

On the other hand, since the output "1" of the switching control circuit 80 is inverted to "0" by the inverter 81, the switching means 74 to 79 are connected to the registers 23 to 25, respectively. Are multiplied by the values of the registers 23 to 25, and the respective amplitudes are varied. In the adder circuits 20 to 22, the values of the registers 26 to 28 are added to the respective RGB, and the respective DC levels are varied.
That is, according to the output timing of the switching control circuit 80, the hue and saturation adjustment can be switched between RGB adjustment and YSH adjustment. The switching control timing of the switching control circuit 80 may be an instruction from the signal source 101, for example. Since the signal source 101 has the position information of the B area fitted as shown in FIG. 10, the switching operation of the switching control circuit 80 is performed based on the position information. For example, the switching control circuit 80 may be configured to generate a timing pulse by a counter circuit (not shown) based on address information received from the signal source 101.

  As described above, the YSH adjustment or the RGB adjustment for adjusting the hue and saturation can be properly used for the embedded image region. In FIG. 10, hue and saturation adjustment is performed only for the B area, but it is a feature of the present invention that the B area can be adjusted for RGB and the A area can be adjusted for hue and saturation according to the user's request.

  Furthermore, even when the number of embedded images increases as shown in FIG. 11, the present invention is effective, and separate hue and saturation adjustments are possible in the B area and C area of FIG. For this purpose, the addresses of the registers 10 and 11 may be switched by the switching control circuit 80 in accordance with the timings of the display areas B and C.

Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 12 is a block diagram showing a fourth embodiment of the image display apparatus according to the present invention. The feature of this embodiment is that the output of the hue detection circuit 3 is input / output converted by the hue LUT 90 to convert it to an arbitrary hue, and the output of the hue detection circuit 3 is input / output converted by the saturation LUT 91 to change the saturation of a specific hue. The degree is that the degree can be arbitrarily changed. Since other circuit operations are the same as those in FIG.

  FIG. 13 shows an example of input / output characteristics of the hue LUT and the saturation LUT. FIG. 13A is a characteristic diagram of the hue LUT showing a specific setting of hue, and FIG. 13B is a characteristic diagram of the LUT showing a specific setting of saturation. In FIG. 13A, the vertical axis represents the hue θ expressed by an angle, and the horizontal axis represents a digital value D indicating the hue. FIG. 13B shows the hue θ on the horizontal axis and the normalized value R on the vertical axis. As shown in FIG. 13A, in the hue LUT, the peripheral hue is slightly shifted around the specific hue. Further, as shown in FIG. 13B, in the saturation LUT, the saturation is emphasized by making the saturation larger than 1 time in a specific hue.

  In order to convey the adjustment image in an easy-to-understand manner, a specific adjustment example is shown using the hue diagram of FIG. FIG. 14 is a characteristic diagram showing the conversion of hue and saturation, with the horizontal axis indicating the BY level and the vertical axis indicating the RY level. In FIG. 14, the saturation is increased in the red direction within the range of the hue 83. This is achieved by setting the saturation coefficient near the red phase in the saturation LUT to be larger than 1. Next, the hue 84 near the skin color is set to a hue 84a obtained by slightly rotating the hue in the red direction to further increase the saturation. This is to make the skin color look healthy. In this case, as shown in FIG. 13A, the saturation coefficient is slightly emphasized in the vicinity of the skin color phase in the saturation LUT, while the phase is slightly decreased in the vicinity of the skin color phase in the hue LUT. Then, in the hue 85 near blue, such as sky blue, the saturation of blue is emphasized by the saturation LUT. Sky blue is said to have a better impression as people look more saturated than the original color.

As described above, the hue and saturation of the desired hue can be arbitrarily converted, and the range of seasoning with respect to the display image can be widened to realize rich image expression. In addition, even when color reproduction is difficult due to the influence of the color of the projection light source such as a liquid crystal projector, the present invention can easily realize a hue that is difficult to display on the liquid crystal projector, and can greatly improve the display image quality. It is.

As described above, according to the present invention, suitable color adjustment can be performed.

It is a block diagram which shows the 1st Example of the liquid crystal display device by this invention. It is a block diagram showing an embodiment of a matrix circuit that inputs a color signal and outputs a luminance signal and a color difference signal. It is a block diagram which shows one Example of the matrix circuit which inputs a brightness | luminance and a color difference signal, and outputs a color signal. It is a block diagram which shows one Example of a hue detection circuit. It is a block diagram which shows one Example of a detection circuit again. It is a characteristic view for demonstrating the relationship between hue and saturation. FIG. 6 is a characteristic diagram illustrating hues and normalized levels of color difference signals. It is a block diagram which shows the 2nd Example of the image display apparatus by this invention. It is a block diagram which shows the 3rd Example of the image display apparatus by this invention. It is a front view of a display display at the time of fitting other screens on the screen. It is a front view of a display display at the time of fitting two screens on the screen. It is a block diagram which shows the 4th Example of the image display apparatus by this invention. FIG. 6 is a characteristic diagram of a hue LUT indicating a specific setting of hue and an LUT indicating a specific setting of saturation. It is a characteristic view which shows conversion of hue and saturation. It is a block diagram which shows the 5th Example of the image display apparatus by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Signal source, 2, 16 ... Matrix circuit, 3 ... Hue detection circuit, 4 ... Saturation detection circuit, 13 ... Color difference reproduction circuit, 60 ... Division circuit, 61 ... Inverse trigonometric function circuit, 64 ... Square root circuit, 80 ... Switching control circuit, 90 ... hue LUT, 91 ... saturation LUT.

Claims (9)

In an image display device,
First signal conversion means for converting an input image signal into a luminance signal, a hue signal, and a saturation signal and outputting them;
A hue adjusting unit that performs hue adjustment by changing the hue signal output from the first signal converting unit, and a chroma that performs saturation adjustment by changing the saturation signal output from the first signal converting unit. First color adjustment means including degree adjustment means ;
The hue signal adjusted by the hue adjusting means in the first color adjusting means, the saturation signal adjusted by the saturation adjusting means in the first color adjusting means, and the luminance output from the first signal converting means Second signal conversion means for converting the signal into RGB three primary color signals and outputting the signals;
Second color adjusting means capable of individually adjusting signals of the three primary color signals output from the second signal converting means ;
A display device for displaying an image based on the three primary color signals output from the second signal converting means ;
Switching means for switching between the adjustment by the first color adjustment means and the adjustment by the second color adjustment means ,
A first image based on a signal hue and saturation are adjusted by the first color adjustment means and a second image based on at least one of the conditioned signal among the three primary color signals in the second color adjusting means Both of them are capable of being displayed on the screen of the display device. 2. The image display device according to claim 1, wherein the first image is a television image and the second image is a personal computer image . In an image display device,
First signal conversion means for converting an input image signal into a luminance signal, a hue signal, and a saturation signal and outputting them;
A hue adjusting unit that performs hue adjustment by changing the hue signal output from the first signal converting unit, and a chroma that performs saturation adjustment by changing the saturation signal output from the first signal converting unit. First color adjustment means including degree adjustment means ;
The hue signal adjusted by the hue adjusting means in the first color adjusting means, the saturation signal adjusted by the saturation adjusting means in the first color adjusting means, and the luminance output from the first signal converting means Second signal conversion means for converting the signal into RGB three primary color signals and outputting the signals;
Second color adjusting means capable of individually adjusting signals of the three primary color signals output from the second signal converting means ;
A display device for displaying an image based on the three primary color signals output from the second signal converting means ;
Switching means,
The switching means uses the first color adjustment means for either the first image or the second image when both the first image and the second image are displayed on the screen of the display device. An image display apparatus characterized by performing a switching operation so as to perform color adjustment on the other side and color adjustment using the second color adjustment unit. 4. The image display device according to claim 1 , wherein the switching unit performs the switching operation according to a display position of the first or second image.   5. The image display device according to claim 1, wherein the second color adjusting unit is capable of adjusting an amplitude and a direct current level of the RGB three primary color signals. 5. The image display device according to claim 1, wherein the hue adjustment unit stores a first register that stores an adjustment value of a hue that is changed according to an instruction from a viewer, and the first register. An adder that adds the adjustment value stored in the hue signal to the hue signal, and the saturation adjusting means stores a second register that stores the saturation adjustment value changed in accordance with an instruction from the viewer; And a multiplier for multiplying the saturation signal by the adjustment value stored in the second register . 7. The image display device according to claim 1 , further comprising brightness adjusting means capable of adjusting brightness by changing the brightness signal output from the first signal converting means. Image display device. 8. The image display apparatus according to claim 1 , wherein the display device is a plasma display element or a liquid crystal display element. In an image display device capable of displaying PC video and TV video,
First signal conversion means for converting an input image signal into a luminance signal, a hue signal, and a saturation signal and outputting them;
Hue adjustment means for adjusting hue by adjusting the hue signal output from the first signal conversion means, and saturation adjustment by adjusting the saturation signal output from the first signal conversion means. First color adjustment means including saturation adjustment means for performing ;
The hue signal adjusted by the hue adjusting means in the first color adjusting means, the saturation signal adjusted by the saturation adjusting means in the first color adjusting means, and the luminance output from the first signal converting means Second signal conversion means for converting the signal into RGB three primary color signals and outputting the signals;
Second color adjusting means capable of individually adjusting signals of the three primary color signals output from the second signal converting means ;
A display device for displaying an image based on the three primary color signals output from the second signal conversion means ,
When both the television video and the personal computer video are displayed on the display screen of the display device, the television video can be color-adjusted by the first color adjusting means, and the personal computer video can be color-adjusted by the second color adjusting means. An image display device characterized by that.

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