JP2002041000A - Liquid crystal display device and its color correcting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the color reproducibility of a liquid crystal display device by reducing the crosstalk noise of colors. SOLUTION: LUTs(look-up tables) having two-dimensional structure or three- dimensional structure are used in this liquid crystal display device in order to correct color characteristics peculiar to liquid crystal. For example, in a LUT corresponding to R, data are stored so as to output a signal in which influences to be exerted on the display of R by digital signals of G and B are subtracted from the digital signal of R. Numbers of bits of inputs α, β, γ of each LUT are α>β>γ and, for example, in the RUT corresponding to R, the digital signal of R is inputted in the input a and a signal in which the signal of one side of G and B is compressed is inputted in the input β and a signal in which the signal of other side of G and B is compressed is inputted in the input γ.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a color correction method therefor, and more particularly to a liquid crystal display device having excellent color reproducibility and a color correction method therefor.

[0002]

2. Description of the Related Art A liquid crystal display (LCD) which has been researched and developed as a display replacing a CRT has a problem that color reproduction is unnatural due to distortion of a color gamut in addition to contrast and viewing angle dependence. There is. by this,
It is difficult to faithfully reproduce colors, and the appearance of an image is different from that of a CRT.

Conventionally, as a color correction technique for a display such as a liquid crystal display device, for example, Japanese Patent Application Laid-Open No. H10-3134
As disclosed in Japanese Unexamined Patent Application Publication No. 16-163, etc., a look-up table (L
The method using UT) has been widely used.

On the other hand, as a color conversion technique in a printer, Japanese Patent Application Laid-Open Nos. 8-265584 and 8-321
As disclosed in Japanese Patent Application Laid-Open No. 964,
A device using a UT is known. However, in the techniques of the above publications, an LUT reflecting the toner color of the printer is used.
Therefore, it is difficult to use it as it is for color correction of a liquid crystal display device.

[0005]

However, it has been found that the above-described color correction method using the one-dimensional LUT does not sufficiently improve the color reproducibility of the liquid crystal display device. . For example, if the color characteristics of the liquid crystal are CRT
About the difference from, for example, Journal of the Institute of Image Information and Television Engineers, Vol. 52, no. 10, pp. 1527-152
9 (1998) "Color reproduction characteristics of liquid crystal displays", Journal of the Institute of Image Information and Television Engineers, Vol. 54, no. 1, pp.
93-100 (2000), "Relationship between change in gray scale of white chromaticity point on liquid crystal display and image quality" and the like. The present inventors further analyzed the color characteristics of the liquid crystal based on these known facts, and as a result, the following characteristics became clear. Below, L of one-dimensional structure
The fact that color reproducibility of a liquid crystal display device is insufficient in color correction using a UT will be described with reference to FIGS.

FIG. 6 is a diagram showing the color characteristics of a CRT, and FIG. 7 is a diagram showing the color characteristics of a liquid crystal display device. They are,
Three primary colors R (red) G (green) B having values from 0 to 255
Each value of (blue) is 17 points in 16 steps (0, 16, 3
2,..., 240, 255), and a set of all combinations (17 × 17 × 17) for each of the RGB values is given to the CRT and the liquid crystal display device. The color is measured as a CIE XYZ value by a spectral radiance meter and linearly converted.

[0007]

(Equation 1) The result of the inverse transformation from XYZ to R'G'B 'is sorted with respect to R, that is,

[0008]

(Equation 2) The graph is arranged in the following order. In these figures, the vertical axis represents R ′ obtained as described above.
, And the horizontal axis indicates the order in which the data is arranged.

In FIG. 6, the gamma curve of the CRT appears as a straight step-like curve. The horizontal part of the step-like portion of the graph is (R, G, B) = (x, 0, 0),
(X, 0, 16),..., (X, 255, 255) where the values of G and B change,
If the value of R is constant even if the value of R changes variously, it indicates that the component of R 'does not change and is almost constant.

On the other hand, in FIG. 7 showing the color characteristics of the liquid crystal display device, the value of R 'is largely fluctuated and distorted in a portion where the value of R' should be constant. This indicates that, despite the fact that the value of R is constant, the component of R ′ measured due to the change in the values of G and B is interlockingly changing (crosstalk noise is generated). .

This is considered to be a factor that hinders the color reproducibility of the color liquid crystal display device, such as a change in the white point color temperature when the luminance level is changed.

Here, when observing the graph of FIG. 7 in detail, in the liquid crystal display device, if one primary color is formed and another primary color is simultaneously formed, the component of the original primary color becomes turbid due to interference caused by the primary color. It is considered that the phenomenon of (deviation) has occurred. Therefore, a mechanism for compensating for interference between the primary colors, that is, color turbidity (shift) of other primary colors.
Must be provided inside or outside the liquid crystal display device for correction in advance.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems of the prior art, and a liquid crystal display device capable of improving color reproducibility of a liquid crystal display device by reducing color crosstalk noise. An object of the present invention is to provide a color correction method.

[0014]

The liquid crystal display device of the present invention has an LUT inside or around the device, which receives a digital RGB signal of an image and outputs a signal in which color characteristics unique to the liquid crystal are corrected. In a liquid crystal display device for inputting a digital signal corrected by the LUT to a liquid crystal panel, the LUT receives a digital signal of a color to be corrected and another one color, and corrects the digital signal of the color to be corrected. A two-dimensional structure in which a signal obtained by subtracting the influence of another one color digital signal on the display of a color is output, or a color to be corrected and another two color digital signal are input and corrected. A three-dimensional structure in which a signal obtained by subtracting the influence of the other two color digital signals on the display of the color corrected from the digital signal of the other color is output, thereby achieving the above object. That.

The LUT has three inputs α, β and γ.
The number of bits of each of the inputs α, β, and γ is α>β> γ, and the LUT for correcting the R digital signal is configured such that the R digital signal is input to the input α. A signal obtained by compressing one of the G and B digital signals is input to an input β, a signal obtained by compressing the other digital signal of G and B is input to an input γ, and an LUT for correcting the G digital signal is , An input α receives a G digital signal, an input β receives a signal obtained by compressing one of the B and R digital signals, an input γ receives a signal obtained by compressing the other digital signal of B and R, In the LUT for correcting the B digital signal, a B digital signal is input to an input α, a signal obtained by compressing one digital signal of R and G is input to an input β, and the other of the R and G is input to an input γ. Compress the digital signal of Preferably, the signal is input.

The LUT has a two-dimensional structure having two systems of inputs α and β. The number of bits of each of the inputs α and β is α> β, and an LU for correcting an R digital signal is provided.
In T, an R digital signal is input to an input α, a signal obtained by compressing one of the G and B digital signals is input to an input β, and an LUT for correcting the G digital signal is a GUT to an input α. A digital signal is input, a signal obtained by compressing one of the B and R digital signals is input to input β, and B
LUT for correcting the digital signal of
, And a signal obtained by compressing one of the R and G digital signals is input to the input β.

A two-input one-output multiplexer is arranged at the input β of the LUT having the two-dimensional structure, and the multiplexer receives digital signals of the other two colors to be corrected, and outputs one of the two colors. Preferably, a digital signal is output and input to the input β of the corresponding LUT.

According to the color correction method for a liquid crystal display device of the present invention, an LUT for correcting color characteristics peculiar to liquid crystal is used in a liquid crystal display device which performs display by inputting RGB digital signals of an image to a liquid crystal panel. A method of correcting each digital signal, wherein a digital signal of a color to be corrected and another one color are inputted, and a display of a color to be corrected based on the digital signal of the color to be corrected is displayed. An LUT having a two-dimensional structure from which a signal obtained by subtracting the influence of a digital signal is output,
Alternatively, a digital signal of a color to be corrected and another two colors is input, and a signal obtained by subtracting the influence of the digital signals of the other two colors on the display of the corrected color from the digital signal of the corrected color. The digital signal is corrected by using a three-dimensional LUT that outputs the above, thereby achieving the above object.

The LUT has a three-dimensional structure having three inputs α, β, and γ, and each input α, β, and γ
The LUT for correcting the digital signal of R is input with the digital signal of R at the input α, and the digital signal of one of G and B is input at the input β. Is input, a signal obtained by compressing the other digital signal of G and B is input to an input γ, and a G digital signal is input to an input α to an LUT for correcting the G digital signal. , A signal obtained by compressing one of the digital signals B and R is input to an input β, and B and R are input to an input γ.
The LUT for correcting the digital signal of B is input with the digital signal of B at the input α, and the digital signal of one of R and G is compressed at the input β. It is preferable to input a signal obtained by compressing the other digital signal of R and G to the input γ.

The LUT has two inputs α and β.
And a LUT for correcting the digital signal of R is input with the digital signal of R at the input α. , A signal obtained by compressing one of the digital signals G and B is input to an input β, and a G digital signal is input to an input α, and B and R are input to an input β in an LUT for correcting the G digital signal. The LUT for correcting the digital signal of B is inputted with the digital signal of B at the input α, and the digital signal of one of R and G is compressed at the input β. It is preferable to input the obtained signal.

For the input β of the LUT having the two-dimensional structure, it is preferable to select and input one of digital signals of the other two colors to be corrected using a two-input one-output multiplexer.

Hereinafter, the operation of the present invention will be described. Here, the R component corresponding to the primary color red will be described, but the same applies to G and B corresponding to the primary color green and the primary color blue.

As shown in FIG. 7 described above, in the liquid crystal display device, when the value of G or the value of B fluctuates, R
Is constant, the component of R '(which is the value of the digital signal calculated by performing an inverse conversion from the displayed color), which should be essentially unchanged, changes. Therefore, a value obtained by subtracting a change in R ′ due to a change in G or B from the value of R is used as LUT data.
, The value of R output from the LUT is a value that makes the sawtooth-shaped protrusion shown in FIG. 7 reversely corrected and flattened. Therefore, if the value of R is constant even if the values of G and B fluctuate, the same value of R 'is obtained as a result, and color crosstalk noise is reduced and color reproducibility is improved.

Further, as shown in an embodiment described later,
Variations in the R 'component due to the characteristics of the liquid crystal display greatly affect the variation in either G or B.
By compressing and inputting the digital signal accordingly, the required memory capacity of the LUT can be reduced.

Further, in the case of an LUT having a two-dimensional structure, one of digital signals of the other two primary colors to be corrected is selected and input using a two-input one-output multiplexer, so that a liquid crystal display device is provided. There is no need to change the wiring around the input section due to the above characteristics, and various characteristics can be dealt with.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a diagram for explaining a color correction section of a liquid crystal display device of Embodiment 1. This liquid crystal display device has respective LUTs (here, 3D (three-dimensional structure) LUTs) for correcting RGB digital signals.
Are provided with three inputs α, β, and γ. RGB digital signals (for example, 8 bits) are input, and corrected signals are output from each LUT and input to a liquid crystal panel (not shown). Is configured.

The LUT may be provided inside or around the liquid crystal display device.
Alternatively, a semiconductor memory such as a RAM can be used.

The data in each LUT is obtained by developing the measurement data as described in FIG. 7 into a three-dimensional structure and displaying the corrected color digital signal (R) (R '). ) Is output so that a signal obtained by subtracting the influence of the digital signals of the other two colors (G and B) is output. Note that the corrected signal can be created by creating an address using the input digital signal and outputting the data stored in the LUT as it is based on the address.

FIG. 8 shows the color characteristics of the liquid crystal shown in FIG.
The directions of the coordinate axes of R, G, and B, which are formed into a dimensional graph, are as illustrated, and the coordinate origin is located at the lower left,
From there, the R axis goes to the lower right, the G axis goes to the upper direction, and the B axis goes to the upper right. 17 × 17 × 1
A signal of seven RGB coordinate values (17 × 17 × 17 equally-spaced grid points, not particularly shown on this graph) is input to the liquid crystal display device, and the color is measured by the measuring device to obtain XYZ.
→ The result of returning to R'G'B 'becomes a grid point on the figure. In this figure, data (lattice points) corresponding to the same B value are displayed on the same curved surface in order to make the data easy to see. In this figure, interference (cross talk) with B 'occurs at a level where R' is low, and the surface which should be a plane is distorted. FIG.
Is the same data as viewed from another direction (the direction of the G axis). In these figures, the interference relationship between R 'and B' is shown, but the interference between B'G 'and between G'R' is also the same. The data to be stored in the LUT is created as three-dimensional correction data such that these curved surfaces in FIGS. 8 and 9 become (in this case) a plane perpendicular to the B axis.

As a result, the sawtooth-shaped projection shown in FIG. 7 can be flattened by reversely correcting it, and the CR-shaped projection shown in FIG.
It is possible to obtain characteristics similar to T.

An LU having a simple three-dimensional structure
When you try to realize T, for example, when each RGB is represented by 8 bits, 2 ²⁴ ways × 8 bits × 3 (≒ 50
A large LUT (M bytes) is required, which is not practical. Therefore, in the following embodiment, a method for correcting a factor that hinders the color reproducibility of a liquid crystal display device using a smaller LUT according to the color characteristics of the liquid crystal will be described.

(Embodiment 2) In order to consider the optimum configuration of the LUT, if the graph of FIG. 7 is carefully observed, a sawtooth-shaped projection which locally draws a gamma curve but locally rises to the left It can be seen that there are 17. In each of the protruding portions (hereinafter referred to as section In), R takes a certain value (any of 0, 16,..., 255), and G and B

[0034]

(Equation 3) It changes in the order. From the order of these values,
It can be seen that in this section In, the value of G changes slowly and the value of B changes finely. By comparing the manner of this change and the shape of the sawtooth-shaped protrusion in the graph, it can be seen that the influence of the change of the G component is greater on the change of the R ′ component than on the B component. By performing the same observation for G ′ and B ′, it is understood that the G ′ component is strongly affected by B, and the B ′ component is strongly affected by R. To sort this out,

[0035]

[Table 1] The relationship is as follows.

Therefore, in the present embodiment, instead of making the number of bits of all three inputs α, β, and γ of the LUT having a three-dimensional structure the same, instead of taking the above-mentioned color characteristics of the liquid crystal display device into consideration, FIG. The number of bits is set to satisfy α>β> γ as shown in FIG. The allocated amount of the bit number changes depending on which of the three primary colors the LUT corresponds to.

In FIG. 2, assuming that each RGB appears as an 8-bit digital signal, the allocation of the input bits of the LUT is not uniform as described above, and the allocation reflects the color characteristics of the liquid crystal display device. I have. In particular,
In the LUT corresponding to R, R input α = 8 bits, G input β
= 4 bits, B input γ = 2 bits, and in the LUT corresponding to G, G input α = 8 bits, B input β = 4 bits, R input γ = 2 bits, and the LU corresponding to B
In T, B input α = 8 bits, R input β = 4 bits, and G input γ = 2 bits. This is because, as shown in Table 1 above, the component of R ′ is strongly affected by the variation of G and the variation of B is weakly affected, and the component of G ′ is affected by the variation of B. The color characteristics of the liquid crystal display device are strongly affected and the influence of the fluctuation of R is weakly affected, and the component of B 'is strongly affected by the fluctuation of R and also weakly affected by the fluctuation of G. This is to reflect it.

Thus, the number of input bits of the LUT is set to 8
Bit × 3 = 24 bits can be reduced to 8 bits + 4 bits + 2 bits = 14 bits, and the size of the LUT can be reduced from 50 Mbytes to 2 ¹⁴ ways × 8 bits × 3 = 48.
It can be reduced by a factor of about 1000 to k bytes.

The data in each LUT is as shown in FIG.
Expand the measurement data as described in the above into a three-dimensional structure,
It is possible to use a signal which is appropriately thinned out and compressed according to the bit ratio of each α, β, γ input. In FIG. 2, for example, in the LUT corresponding to R, 8 bits [0: 0] of the R digital signal are input to the input α of 8 bits [7: 0].
The bit [7: 0] is input, the 4-bit [7: 4] from bit 4 to bit 7 of the G digital signal is input to the input β of the 4-bit [3: 0], and 2 bits are input. [1:
[0: 0], one bit [7: 6] from bit 6 to bit 7 of the B digital signal is input. In addition,
The bit configuration of the above LUT differs depending on the characteristics of the liquid crystal display device to be subjected to color correction. here,
The input digital signal uses only specific upper bits.

(Embodiment 3) FIG. 3 is a diagram for explaining a color correction section of a liquid crystal display device of Embodiment 3. In the third embodiment, a special case of the second embodiment will be described.

Depending on the characteristics of the liquid crystal display device to be subjected to color correction, the number of bits of the input γ of the LUT having the three-dimensional structure can be extremely reduced. In this case, it is possible to configure the color correction unit by using an LUT having a two-dimensional structure as shown in FIG.

As the data in each LUT, the above-mentioned FIG.
Expand the measurement data as described in the above into a two-dimensional structure,
As in the second embodiment, a signal appropriately compressed and thinned out according to the bit ratio of each input α and β can be used.

In the present embodiment, the number of input bits of each LUT can be reduced to 8 bits + 4 bits = 12 bits, and the size of the LUT is 2 ¹² × 8 bits × 3 = 12
LUT becomes k bytes and is smaller than that of the second embodiment.
Is enough.

(Embodiment 4) FIG. 4 is a view for explaining a color correction section of a liquid crystal display device of Embodiment 4. In the fourth embodiment, L having a two-dimensional structure similar to that of the third embodiment is used.
This is an example using a UT, but the relationship of color interference due to crosstalk is different from that of the third embodiment.

[0045]

[Table 2] The case where is described.

For example, in the third embodiment, as shown in Table 1 above, since the influence of the fluctuation of G is strong on the component of R ′,
R and G digital signals are input to the LUT having a two-dimensional structure corresponding to the above. In the fourth embodiment, as shown in Table 2 above, the influence of the fluctuation of B on the R ′ component is R and B for the two-dimensional LUT corresponding to R
Input digital signal.

Similarly, in the second embodiment, the LU
Various combinations of the correspondence between the α, β, and γ inputs of T and the R, G, and B inputs can be considered depending on the characteristics of the liquid crystal display device to be subjected to color correction.

(Embodiment 5) FIG. 5 is a diagram for explaining a color correcting section of a liquid crystal display device of Embodiment 5.
As shown in FIGS. 3 and 4 in the third and fourth embodiments, when the LUT having a two-dimensional structure is used, if the characteristics of the liquid crystal display device are different, for example, the LUT corresponding to R
The wiring around the β input of the LUT changes so that the β input of FIG. 3 becomes G in FIG. 3 and B in FIG.

In order to prevent this, in the present embodiment, as shown in FIG. 5, a two-input one-output multiplexer (MUX) is arranged at each input β of the LUT having a two-dimensional structure. Then, for example, the G and B digital signals are input to the multiplexer, and either one is selected, and the LU corresponding to R is selected.
Input to the β input of T.

As a result, the signal input can be reconfigured without changing the wiring around the signal input section of the LUT, and it is possible to cope with the difference in the characteristics of the liquid crystal display device.

[0051]

As described above in detail, according to the first and fifth aspects of the present invention, the color reproducibility of a liquid crystal display device whose color characteristics are distorted due to crosstalk noise can be improved by using a two-dimensional structure or the like. This can be improved by using an LUT having a three-dimensional structure.

According to the second and sixth aspects of the present invention, color reproduction of a color liquid crystal display device is economically achieved by using an LUT having an optimum three-dimensional structure that matches the color characteristics of the liquid crystal display device. It is possible to improve the performance.

According to the third and seventh aspects of the present invention, color reproduction of a color liquid crystal display device is economically achieved by using an LUT having an optimum two-dimensional structure that matches the color characteristics of the liquid crystal display device. It is possible to improve the performance.

According to the fourth and eighth aspects of the present invention, since the signal input can be reconfigured without changing the wiring around the signal input portion of the LUT, the characteristics of the liquid crystal display device can be varied. Can be handled.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a color correction unit of a liquid crystal display device according to a first embodiment.

FIG. 2 is a diagram illustrating a color correction unit of a liquid crystal display device according to a second embodiment.

FIG. 3 is a diagram illustrating a color correction unit of a liquid crystal display device according to a third embodiment.

FIG. 4 is a diagram illustrating a color correction unit of a liquid crystal display device according to a fourth embodiment.

FIG. 5 is a diagram illustrating a color correction unit of a liquid crystal display device according to a fifth embodiment.

FIG. 6 is a diagram illustrating color characteristics of a CRT.

FIG. 7 is a diagram illustrating color characteristics of a liquid crystal display device.

FIG. 8 is a three-dimensional graph of the color characteristics of the liquid crystal.

FIG. 9 is a three-dimensional graph of the color characteristics of the liquid crystal.

[Explanation of symbols]

2D-LUT Two-dimensional LUT 3D-LUT Three-dimensional LUT MUX Multiplexer R [7: 0] Indicates 8 bits from bit 0 to bit 7 of the primary color red (R). G [7: 0] Indicates 8 bits from bit 0 to bit 7 of the primary color green (G). B [7: 0] Indicates 8 bits from bit 0 to bit 7 of the primary color blue (B). R [7: 4] Indicates 4 bits from bit 4 to bit 7 of the primary color red (R). G [7: 4] Indicates four bits from bit 4 to bit 7 of the primary color green (G). B [7: 4] Indicates four bits from bit 4 to bit 7 of the primary color blue (B). R [7: 6] Indicates two bits from bit 6 to bit 7 of the primary color red (R). G [7: 6] Indicates two bits from bit 6 to bit 7 of the primary color green (G). B [7: 6] Indicates two bits from bit 6 to bit 7 of the primary color blue (B). α [7: 0] bit 0 to bit 7 of LUT input α
8 bits up to 8 bits. β [7: 0] bit 0 to bit 7 of LUT input β
8 bits up to 8 bits. γ [7: 0] bit 0 to bit 7 of LUT input γ
8 bits up to 8 bits.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 9/12 H04N 9/12 B 5C080 9/64 9/64 EF term (Reference) 2H093 NA61 NC14 ND15 ND17 ND24 5C006 AA01 AA22 AF13 AF46 AF85 BB11 BF01 BF24 FA36 FA56 5C058 AA06 BA10 BB14 5C060 BA07 BB01 BC05 DA02 HB23 HB26 JA20 5C066 AA03 CA17 DD06 EA05 EA11 EB01 EC01 EC12 GA31 HA03 KE02 A10 05 030

Claims (8)

[Claims] 1. An image RG inside or around a device.
A liquid crystal display device that has an LUT that receives each digital signal of B and outputs a signal in which the color characteristics unique to the liquid crystal have been corrected, and that inputs the digital signal corrected by the LUT to a liquid crystal panel. And a digital signal of another color are input, and a signal is output which is obtained by subtracting the influence of the digital signal of another color on the display of the color to be corrected from the digital signal of the color to be corrected. A two-dimensional structure, or
The digital signal of the color to be corrected and the other two colors are input,
A liquid crystal display device having a three-dimensional structure that outputs a signal obtained by subtracting the influence of the other two digital signals on the display of the corrected color from the corrected digital signal. 2. The LUT has a three-dimensional structure having three inputs α, β, and γ, and the number of bits of each input α, β, and γ is α>β> γ. In the LUT for correction, an R digital signal is input to an input α, a signal obtained by compressing one of the G and B digital signals is input to an input β, and the other digital signal of G and B is compressed to an input γ. In the LUT for correcting the G digital signal, a G digital signal is input to an input α, a signal obtained by compressing one of the B and R digital signals is input to an input β, and an input γ A signal obtained by compressing the other digital signal of B and R is input to the LUT. The LUT for correcting the digital signal of B is such that a digital signal of B is input to an input α, and one digital signal of R and G is input to an input β. Input signal is compressed signal Is, the liquid crystal display device according to claim 1 in which the signal obtained by compressing the other digital signals of R and G are input to the input gamma. 3. The LUT has a two-dimensional structure having two systems of inputs α and β, the number of bits of each input α and β is α> β, and the LUT for correcting the digital signal of R is , An R digital signal is input to an input α, a signal obtained by compressing one of the G and B digital signals is input to an input β, and a LUT for correcting the G digital signal is a G digital signal input to an input α. A signal obtained by compressing one of the B and R digital signals is input to an input β. An LUT for correcting the B digital signal has a B digital signal input to an input α, and an R β input to an input β. And a signal obtained by compressing one of the digital signals G and G.
3. The liquid crystal display device according to 1. 4. An input β of the LUT having the two-dimensional structure.
And a two-input one-output multiplexer, each of which receives a digital signal of another two colors of the color to be corrected, outputs a digital signal of one of the two colors, and outputs the digital signal to a corresponding input β of the LUT. The liquid crystal display device according to claim 3, wherein the input is performed. 5. A method for correcting each digital signal using an LUT for correcting a color characteristic peculiar to a liquid crystal in a liquid crystal display device which performs display by inputting RGB digital signals of an image to a liquid crystal panel. The digital signal of the color to be corrected and one other color is input,
An LUT having a two-dimensional structure that outputs a signal obtained by subtracting the influence of another one color digital signal on the display of the color to be corrected from the digital signal of the color to be corrected, or a color to be corrected and another LUT An LUT having a three-dimensional structure in which a two-color digital signal is input and a signal obtained by subtracting the influence of another two-color digital signal on the display of the corrected color from the corrected digital signal is output. A color correction method for a liquid crystal display device that corrects a digital signal by using the method. 6. An LUT having a three-dimensional structure having three systems of inputs α, β, and γ, wherein the number of bits of each of the inputs α, β, and γ is α>β> γ, The LUT for correcting the digital signal has an input α
, A digital signal of one of G and B is input to input β, and a G signal is input to input γ.
And a signal obtained by compressing the other digital signal of B, and an LUT for correcting the digital signal of G has an input α
Input a G digital signal, input a signal obtained by compressing one of the B and R digital signals to an input β, and input a B signal to an input γ.
And a signal obtained by compressing the other digital signal of R, and an LUT for correcting the digital signal of B has an input α
A digital signal of B is input to R, a signal obtained by compressing one of the R and G digital signals is input to input β, and R is input to input γ.
6. The color correction method for a liquid crystal display device according to claim 5, wherein a signal obtained by compressing the other digital signal of G and G is input. 7. An LUT having a two-dimensional structure having two systems of inputs α and β, wherein the number of bits of each input α and β is α> β, for correcting an R digital signal. LUT has input α
, A signal obtained by compressing one of the G and B digital signals is input to an input β, and an input α is input to an LUT for correcting the G digital signal.
, A signal obtained by compressing one of the B and R digital signals is input to an input β, and an input α is input to an LUT for correcting the B digital signal.
6. The color correction method for a liquid crystal display device according to claim 5, wherein a digital signal of B is input to the input terminal, and a signal obtained by compressing one of the digital signals of R and G is input to input β. 8. An input β of the LUT having the two-dimensional structure
8. The color correction method for a liquid crystal display device according to claim 7, wherein one of two other digital signals of the color to be corrected is selected and input using a two-input one-output multiplexer.