CN101820551B - Method, device and system for debugging liquid crystal display gamma - Google Patents

Abstract

The embodiment of the invention provides a method, a device and a system for debugging liquid crystal display gamma, which belong to the technical field of liquid crystal display terminals. The method comprises the following steps of: measuring and calculating liquid crystal screen gamma and a light leakage tristimulus value of a liquid crystal display terminal in an XYZ color system; acquiring liquid crystal display terminal gamma; and adjusting the gamma of a signal processing circuit in the liquid crystal display terminal according to a functional relation between the liquid crystal display terminal gamma and the liquid crystal screen gamma as well as the light leakage tristimulus value. Because the method, the device and the system for debugging the gamma of a liquid crystal display terminal chip in the embodiment of the invention can be regulated by using the functional relation between the liquid crystal display terminal gamma and the liquid crystal screen gamma as well as the light leakage tristimulus value, grey scale colors output by a liquid crystal display screen are kept consistent.

Description

A kind of liquid crystal display gamma debugging method, Apparatus and system

Technical field

The embodiment of the invention relates to the liquid crystal display terminal technical field, particularly a kind of liquid crystal display gamma debugging method, Apparatus and system.

Background technology

Along with the fast development of display terminal technology, liquid crystal display terminals such as LCD TV, LCD are universal day by day, no matter be in people's the family, office or public place, all can see the video playback apparatus based on liquid crystal display terminal whenever and wherever possible.Though the color that liquid crystal display terminal shows is identical with the principle of conventional picture tube display terminal display color, all be to form by three kinds of mix of basic colors of RGB (RGB), but because the input and output of its RGB are non-linear relations, so can't guarantee that when the starting and terminal point in its gamma is debugged the colour mixture ratio of all GTGs is all identical, cause the image gray-scale level color of LCDs output inconsistent.Can adjust interface by the gamma on the liquid crystal display terminal chip in the prior art gamma of liquid crystal display terminal chip is adjusted, thereby make the gradation of image of LCDs output improve.

Yet by the adjustment of the gamma on the liquid crystal display terminal chip interface gamma of liquid crystal display terminal chip being adjusted in the prior art mainly is to utilize manual commissioning device to realize, this regulative mode is wasted time and energy, and debug time is long, and efficient is low.Though and it is short to adjust gamma time of liquid crystal display terminal chip by automatic commissioning device, the debugging weak effect, even as manually debugging is not effective.

Summary of the invention

The purpose of the embodiment of the invention is to provide a kind of liquid crystal display gamma debugging method, Apparatus and system, can revise the gamma of signal processing circuit in the liquid crystal display terminal by liquid crystal display gamma debugging method, Apparatus and system that the embodiment of the invention provided, make the image gray-scale level color of LCDs output be consistent.

In order to realize the foregoing invention purpose, the embodiment of the invention provides a kind of liquid crystal display gamma debugging method, and described method comprises:

Liquid crystal display screen gamma and light leak tristimulus values at XYZ colour system measurements and calculations liquid crystal display terminal;

Obtain the liquid crystal display terminal gamma;

Regulate the gamma of signal processing circuit in the liquid crystal display terminal according to the functional relation of liquid crystal display terminal gamma and liquid crystal display screen gamma and light leak tristimulus values, described functional relation is:

$\left[\begin{array}{c}{X}_p\left(n\right)\\ Y_p\left(n\right)\\ Z_p\left(n\right)\end{array}\right]=\left[\begin{array}{c}{X}_R\left(r\right)\\ Y_R\left(r\right)\\ Z_R\left(r\right)\end{array}\right]+\left[\begin{array}{c}{X}_G\left(g\right)\\ Y_G\left(g\right)\\ Z_G\left(g\right)\end{array}\right]+\left[\begin{array}{c}{X}_B\left(b\right)\\ Y_B\left(b\right)\\ Z_B\left(b\right)\end{array}\right]+\left[\begin{array}{c}{X}_L\\ Y_L\\ Z_L\end{array}\right]$

Wherein

Expression liquid crystal display terminal gamma, n is the GTG coefficient of liquid crystal display terminal 0～255, p is the gamma value of liquid crystal display terminal,

Expression LCDs gamma, r, g, b are respectively the red, green, blue primary colours data response sequence that described liquid crystal display terminal chip waits to transfer gamma,

Be the light leak tristimulus values.

The exponential curve that the liquid crystal display terminal gamma can 2.2 powers in the present embodiment, this exponential curve comprises three gamma curve, described three gamma curve overlap.

The light leak tristimulus values of obtaining corresponding LCDs described in the present embodiment from tristimulus values comprises:

The tristimulus values of obtaining first rank red, green, blue primary colours data correspondence from the described tristimulus values that receives is the light leak tristimulus values of corresponding LCDs.

In order accurately to obtain the gamma of liquid crystal display terminal, the gamma that obtains liquid crystal display terminal in the present embodiment comprises:

Obtain the gamma of liquid crystal display terminal according to the tristimulus values of the high-order primary colours data in described light leak tristimulus values and the described liquid crystal display screen gamma.

In order effectively to regulate the gamma of liquid crystal display terminal signal processing circuit, the gamma according to signal processing circuit in the functional relation adjusting liquid crystal display terminal of liquid crystal display terminal gamma and liquid crystal display screen gamma and light leak tristimulus values in the present embodiment comprises:

Obtain the gamma parameter of the described signal processing circuit adjusted according to the functional relation of described liquid crystal display terminal gamma and LCDs gamma and light leak tristimulus values;

Convert the gamma parameter of described acquisition to gamma tables, and described gamma tables is imported in the described chip.

For accurate picked up signal treatment circuit gamma parameter, the gamma parameter of the described described signal processing circuit of adjusting according to the functional relation acquisition of described liquid crystal display terminal gamma and LCDs gamma and light leak tristimulus values comprises:

Make up from any value of 0～255 according to r, g, b in the described functional relation, obtain 256 ³Individual LCDs GTG value;

According to each GTG of liquid crystal display terminal gamma, from described 256 ³Choose 256 LCDs GTG values in the individual LCDs GTG value near each GTG of liquid crystal display terminal;

Determine r, g, the b response sequence of described chip gamma parameter correspondence according to 256 LCDs GTG values that select.

For quick picked up signal treatment circuit gamma parameter, the described described signal processing circuit gamma parameter that obtains to adjust according to the functional relation of described liquid crystal display terminal gamma and LCDs gamma and light leak tristimulus values also comprises:

Each optic response component of each primary colours rank response function in the described LCDs gamma is fitted to a high-order moment;

According to the relation of described function and each high-order moment, r, g, the b response sequence that obtains corresponding liquid crystal display terminal gamma is described chip gamma parameter.

In order accurately also to obtain chip gamma parameter fast, the described described chip gamma parameter that obtains to adjust according to the functional relation of described liquid crystal display terminal gamma and LCDs gamma and light leak tristimulus values also comprises:

Make up from any value of 0～255 according to r, g, b in the described functional relation, obtain 256 ³Individual LCDs GTG value;

For the pairing low order GTG of predetermined percentage GTG in the liquid crystal display terminal gamma, from described 256 ³Choose one group of LCDs GTG value of the most approaching described low order GTG in the individual LCDs GTG value, and determine first group of r, g, the b response sequence of described signal processing circuit gamma parameter correspondence according to the one group of LCDs GTG value that selects;

Each optic response component of each primary colours rank response function in the described LCDs gamma is fitted to a high-order moment;

According to the relation of described function and each high-order moment, obtain second group of r, g, the b response sequence of corresponding other GTGs of liquid crystal display terminal gamma;

Obtain described signal processing circuit gamma parameter according to described first group of r, g, b response sequence and described second group of r, g, b response sequence.

To achieve these goals, the embodiment of the invention also provides a kind of liquid crystal display gamma debugging apparatus, and described device comprises:

Serial ports is used for linking to each other with the signal processing circuit of the liquid crystal display terminal of waiting to transfer gamma, transmission be sent to described signal processing circuit output primary colours data instruction and regulate back gamma parameter;

Measuring unit is used for liquid crystal display screen gamma and light leak tristimulus values at XYZ colour system measurements and calculations liquid crystal display terminal;

Acquiring unit is used to obtain the liquid crystal display terminal gamma;

The gamma debugging unit, be used for the liquid crystal display screen gamma that the liquid crystal display terminal gamma that gets access to according to described acquiring unit and described measuring unit measure and calculate and the functional relation of light leak tristimulus values and regulate the gamma of liquid crystal display terminal signal processing circuit, described functional relation is:

$\left[\begin{array}{c}{X}_p\left(n\right)\\ Y_p\left(n\right)\\ Z_p\left(n\right)\end{array}\right]=\left[\begin{array}{c}{X}_R\left(r\right)\\ Y_R\left(r\right)\\ Z_R\left(r\right)\end{array}\right]+\left[\begin{array}{c}{X}_G\left(g\right)\\ Y_G\left(g\right)\\ Z_G\left(g\right)\end{array}\right]+\left[\begin{array}{c}{X}_B\left(b\right)\\ Y_B\left(b\right)\\ Z_B\left(b\right)\end{array}\right]+\left[\begin{array}{c}{X}_L\\ Y_L\\ Z_L\end{array}\right]$

Wherein

Expression liquid crystal display terminal gamma, n is the GTG coefficient of liquid crystal display terminal 0～255, p is the gamma value of liquid crystal display terminal,

Expression liquid crystal display screen gamma, r, g, b are respectively the red, green, blue primary colours data response sequence that described liquid crystal display terminal signal processing circuit waits to transfer gamma,

Be the light leak tristimulus values.

For effective conditioning signal treatment circuit gamma parameter, described gamma debugging unit comprises:

Acquisition module is used for obtaining according to the functional relation of described liquid crystal display terminal gamma and liquid crystal display screen gamma and light leak tristimulus values the gamma parameter of the described signal processing circuit adjusted;

Adjustment module is used for converting the described signal processing circuit gamma parameter that described acquisition module obtains to gamma tables, and described gamma tables is imported in the described signal processing circuit.

To achieve these goals, the embodiment of the invention also provides a kind of liquid crystal display gamma debug system, and described system comprises:

The liquid crystal display terminal signal processing circuit is used for exporting the primary colours data according to the instruction of computer by rank;

The data acquisition end is used for according to the tristimulus values of the described signal processing circuit of the instruction acquisition of computer by rank output primary colours data correspondence, and the tristimulus values of every rank primary colours data correspondence is sent to computer;

Computer is used for sending to described liquid crystal display terminal signal processing circuit the instruction of output primary colours data; Also be used for sending the instruction of gathering the primary colours data to the data acquisition end, and the liquid crystal display screen gamma formed of the tristimulus values that receives each rank primary colours data of the corresponding described signal processing circuit output that the data acquisition end sends, obtain the gamma of liquid crystal display terminal, and from described tristimulus values, obtain the light leak tristimulus values of corresponding LCDs, regulate the gamma of liquid crystal display terminal signal processing circuit according to the functional relation of liquid crystal display terminal gamma and liquid crystal display screen gamma and light leak tristimulus values, described functional relation is:

$\left[\begin{array}{c}{X}_p\left(n\right)\\ Y_p\left(n\right)\\ Z_p\left(n\right)\end{array}\right]=\left[\begin{array}{c}{X}_R\left(r\right)\\ Y_R\left(r\right)\\ Z_R\left(r\right)\end{array}\right]+\left[\begin{array}{c}{X}_G\left(g\right)\\ Y_G\left(g\right)\\ Z_G\left(g\right)\end{array}\right]+\left[\begin{array}{c}{X}_B\left(b\right)\\ Y_B\left(b\right)\\ Z_B\left(b\right)\end{array}\right]+\left[\begin{array}{c}{X}_L\\ Y_L\\ Z_L\end{array}\right]$

Wherein Expression liquid crystal display terminal gamma, n is the GTG coefficient of liquid crystal display terminal 0～255, p is the gamma value of liquid crystal display terminal, Expression liquid crystal display screen gamma, r, g, b are respectively the red, green, blue primary colours data response sequence that described liquid crystal display terminal signal processing circuit waits to transfer gamma,

Be the light leak tristimulus values.

The described liquid crystal display gamma debugging method of the embodiment of the invention, Apparatus and system, can regulate the gamma of liquid crystal display terminal signal processing circuit by the functional relation of liquid crystal display terminal gamma and liquid crystal display screen gamma and light leak tristimulus values, make the image gray-scale level color of LCDs output be consistent.

Description of drawings

In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

The FB(flow block) of a kind of LCD TV gamma debugging method that Fig. 1 provides for the embodiment of the invention.

The FB(flow block) of the another kind of LCD TV gamma debugging method that Fig. 2 provides for the embodiment of the invention.

Fig. 3 is the functional block diagram of the LCD TV gamma debugging apparatus of the embodiment of the invention.

Fig. 4 is the LCD TV gamma debug system structured flowchart of the embodiment of the invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is removed, intactly described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Illustrative examples of the present invention and explanation thereof are used to explain the present invention; but it is not as a limitation of the invention; based on the embodiment among the present invention; those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.

The embodiment of the invention provides a kind of LCD TV gamma debugging technique, and this technology is debugged the gamma of signal processing circuit in the LCD TV by complete machine gamma and LCDs gamma, makes the image gray-scale level color of LCDs output be consistent.

Liquid crystal display terminal in the embodiment of the invention is that example describes with the LCD TV, this illustrative examples and explanation thereof only are used for explaining the present invention's technology, make those skilled in the art fully understand technical scheme, but not as a limitation of the invention.

The embodiment of the invention provides a kind of LCD TV gamma debugging method, as shown in Figure 1, and the FB(flow block) of a kind of LCD TV gamma debugging method that Fig. 1 provides for the embodiment of the invention.As can be seen from Figure 1, the gamma debugging method in the present embodiment comprises:

101. liquid crystal display screen gamma and light leak tristimulus values in XYZ colour system measurements and calculations LCD TV.

Will can be based on LCD TV complete machine gamma H (x) in the present embodiment to the gamma adjustment of LCD TV realizes with the function nest relation of liquid crystal television screen gamma G (x) and LCD TV signal processing circuit gamma F (x), be H (x)=G (F (x)), therefrom can know and find out as long as acquisition LCD TV complete machine gamma H (x) and liquid crystal television screen gamma G (x) can debug LCD TV signal processing circuit gamma F (x).Debugging apparatus in the present embodiment can be treatment facilities such as computer, will be that example describes with the computer at this present embodiment.

For liquid crystal display screen gamma present embodiment by realizing in of the measurements and calculations of XYZ colour system to the liquid crystal display screen of LCD TV, wait to transfer the LCD TV signal processing circuit of gamma to export each rank RGB primary colours data such as making by prior art, each rank primary colours data is gathered and is converted into corresponding tristimulus values after LCDs shows, thereby computer receives the liquid crystal display screen gamma that the tristimulus values of each rank primary colours data correspondence that collection terminal collects is formed in this step, the red corresponding tristimulus values in every rank such as 256 rank in red, in like manner, the green also corresponding tristimulus values in every rank during 256 rank are green, the also corresponding tristimulus values of the every rank indigo plant in the 256 rank basket.So this step can receive each tristimulus values of 768 primary colours data correspondences, all tristimulus values that receive also are the gamma of liquid crystal display screen.From each the self-corresponding tristimulus values of all primary colours data that receives, obtain the light leak tristimulus values.This light leak tristimulus values is the first rank tristimulus values of each primary colours data of computer reception.Just because of there is light leak in the display on the LCD TV, so the data acquisition end just can collect the light leak data when gathering first rank RGB primary colours data, and the tristimulus values that will contain the light leak data sends to computer, in the tristimulus values of this each primary colours data correspondence of first rank that this step is received as the light leak tristimulus values.Such as XR (0), YR (0), ZR (0), XG (0), YG (0), ZG (0), XB (0), YB (0), ZB (0).

102. obtain the gamma of LCD TV.

LCD TV gamma in this step can be determined according to gamma value, such as when gamma value is 2.2, the numerical value of each GTG in the LCD TV gamma can be that (this exponential curve comprises three gamma curve for 2.2 gamma exponent curve according to gamma value in the prior art, described three gamma curve overlap) determine, this this step is repeated no more.

103. regulate the gamma of signal processing circuit in the LCD TV according to the functional relation of LCD TV gamma and liquid crystal display screen gamma and light leak tristimulus values.

Functional relation in this step is H (x)=G (F (x)) and draws, because 1931CIE XYZ colorimeter system has the character of linear superposition, so this functional relation can be expressed as:

$\left[\begin{array}{c}{X}_p\left(n\right)\\ Y_p\left(n\right)\\ Z_p\left(n\right)\end{array}\right]=\left[\begin{array}{c}{X}_R\left(r\right)\\ Y_R\left(r\right)\\ Z_R\left(r\right)\end{array}\right]+\left[\begin{array}{c}{X}_G\left(g\right)\\ Y_G\left(g\right)\\ Z_G\left(g\right)\end{array}\right]+\left[\begin{array}{c}{X}_B\left(b\right)\\ Y_B\left(b\right)\\ Z_B\left(b\right)\end{array}\right]+\left[\begin{array}{c}{X}_L\\ Y_L\\ Z_L\end{array}\right]$

Wherein

Expression LCD TV gamma, n is the GTG coefficient of LCD TV 0～255, p is the gamma value of LCD TV, can obtain the numerical value of each GTG like this after p determines according to 2.2 times known gamma curve.And

Expression liquid crystal display screen gamma, wherein r, g, b are nested in the red, green, blue primary colours data response sequence that LCD TV signal processing circuit in the liquid crystal display screen gamma waits to transfer gamma, represent the response sequence of 256 rank in red such as r, after the red response of single order is wherein determined, can in each the rank tristimulus values that receives, find out should the red tristimulus values in rank.

Be the light leak tristimulus values, promptly represent XR (0), YR (0), ZR (0), XG (0), YG (0), ZG (0), XB (0), YB (0), ZB (0), this light leak tristimulus values obtains according to step 101.

There is above-mentioned relation as can be known, when the tristimulus values of each rank primary colours data correspondence in LCD TV gamma, light leak tristimulus values and the liquid crystal display screen gamma is all known, can obtain the LCD TV signal processing circuit and wait to transfer the red, green, blue primary colours data response sequence of gamma, thereby can determine the gamma of LCD TV signal processing circuit according to the response sequence of three primary colors.

Such as, because the tristimulus values of each rank primary colours data correspondence is all known in the liquid crystal display screen gamma, so above-mentioned functional relation the right can obtain 256 ³Individual numerical value, from this 256 ³Obtain in the individual numerical value and the immediate numerical value of each GTG value of LCD TV gamma, so just can be from 256 ³Obtain in the individual numerical value 256 with each GTG of LCD TV gamma numerical value one to one, each numerical value is corresponding one group of RGB response, thereby can obtain the red, green, blue primary colours data response sequence of corresponding LCD TV signal processing circuit, 256 rank of output are red after promptly revising, 256 rank are green, 256 rank indigo plants, finally obtain the gamma of LCD TV signal processing circuit.

By this embodiment as can be seen, present embodiment is regulated the gamma of liquid crystal also television signal processing circuit by the functional relation of LCD TV gamma and liquid crystal display screen gamma and light leak tristimulus values, the every rank of amended signal processing circuit gamma colour mixture ratio is all identical, makes the image gray-scale level color of LCDs output be consistent.

The embodiment of the invention provides the gamma debugging method of another kind of LCD TV signal processing circuit, and as shown in Figure 2, Fig. 2 is the gamma debugging method of embodiment of the invention LCD TV signal processing circuit.As can be seen from Figure 2, the gamma debugging method of LCD TV signal processing circuit comprises in the present embodiment:

201. liquid crystal display screen gamma and light leak tristimulus values at XYZ colour system measurements and calculations liquid crystal display terminal;

It is identical with step 101 in the foregoing description to obtain the method for liquid crystal display screen gamma in this step, so locate to repeat no more.

This step is that the tristimulus values of obtaining first rank red, green, blue primary colours data correspondence from the described tristimulus values that receives is the light leak tristimulus values of corresponding LCDs when obtaining the light leak tristimulus values;

Such as obtaining the light leak tristimulus values in each the self-corresponding tristimulus values of all primary colours data that receives.Wherein this light leak tristimulus values is the first rank tristimulus values of each primary colours data of computer reception.Just because of there is light leak in the display on the LCD TV, so the data acquisition end just can collect the light leak data when gathering first rank RGB primary colours data, and the tristimulus values that will contain the light leak data sends to computer, in the tristimulus values of this each primary colours data correspondence of first rank that step 101 is received as the light leak tristimulus values.Such as XR (0), YR (0), ZR (0), XG (0), YG (0), ZG (0), XB (0), YB (0), ZB (0).

202. gamma value by LCD TV or the tristimulus values that receives are obtained the gamma of LCD TV;

This step can be obtained the gamma of LCD TV by gamma value, also can obtain the gamma of LCD TV by the tristimulus values that receives.The gamma that obtains LCD TV by gamma value is prior art, does not repeat them here.And mainly be the gamma that obtains LCD TV according to the tristimulus values of the high-order primary colours data in described light leak tristimulus values and the described LCDs gamma by the gamma that the tristimulus values that receives is obtained LCD TV.The high-order primary colours data tristimulus values of corresponding described LCDs is XR (255), YR (255), ZR (255), XG (255), YG (255), ZG (255), XB (255), YB (255), ZB (255).

Because the gamma value of LCD TV is determined, is 2.2 all generally, what also have is 2.5, and the primary colours tristimulus values of different gamma value correspondences is also slightly inequality.And want to make that the color of TV output light is identical, there is not colour cast, just must make that the ratio of every rank primary colours data RGB is identical, the ratio of the tristimulus values of this step by determining LCD TV gamma value correspondence realizes, according to 1931CIE color space chromatic diagram as can be known, represent the XYZ of tristimulus values can pass through chromaticity coordinates x on this chromatic diagram, y represents, such as x=X/ (X+Y+Z), y=Y/ (X+Y+Z) can obtain the ratio of the XYZ of tristimulus values behind the numerical value of determining x and y.And x and y can determine according to the colour temperature of LCD TV, are example such as the LCD TV that is example with gamma coefficient 2.2, when the colour temperature of this LCD TV is 9600K, and x=0.282, y=0.294, the ratio of XYZ was 0.958: 1: 1.438.This ratio represents that promptly corresponding gamma coefficient is that the ratio of tristimulus values XYZ of each primary colours data of 2.2 is all identical.

The colour temperature that need to prove LCD TV is one of standard parameter of LCD TV, can know according to the parameter form of product description or the printing of LCD TV manufacturer.

The embodiment of the invention mainly is to realize that this step can be determined the first rank parameter of gamma, promptly first rank tristimulus values X by the correction to gamma head and the tail two ends parameter when adjusting the LCD TV gamma _k(0), Y _k(0), Z _k(0), wherein k is the gamma coefficient.This head rank tristimulus values can obtain according to the ratio of the tristimulus values of described light leak tristimulus values that gets access to and definite gamma coefficient correspondence, when being 0.958: 1: 1.438 such as the ratio as XYZ, owing to the ratio value of Y is 1, so at Y _2.2(0)=max (X _L/ 0.958, Y _L, Z _L/ 1.438), X _L, Y _L, Z _LBe the light leak tristimulus values that comprises red-green-blue light, can obtain X so under a proportional relationship _2.2(0)=Y _2.2(0)/0.958, Z _2.2(0)=Y _2.2(0)/1.438.

This step can be determined the high order parameters of LCD TV gamma, promptly high-order tristimulus values X _k(255), Y _k(255), Z _k(255), wherein k is a gamma value.Owing to will guarantee the output brightness of whole LCD TV, so this step can be is earlier obtained brightness values in the high-order tristimulus values of described gamma coefficient correspondence according to the brightness values in the high-order primary colours data tristimulus values and the brightness values in the light leak tristimulus values, represent brightness such as Y in XYZ, so Y _2.2(255)=YR (255)+YG (255)+YB (255)+Y _L, wherein YR (255), YG (255), YB (255) are the brightness values in the high-order RGB primary colours data tristimulus values, Y _LBe the brightness values in the light leak tristimulus values, so just can draw Y earlier _2.2(255), i.e. brightness values in the high-order tristimulus values of gamma coefficient correspondence.Again according to the brightness values in the high-order tristimulus values of the ratio of the tristimulus values of described gamma coefficient correspondence and the described gamma coefficient correspondence that gets access to, obtain two remaining values in the high-order tristimulus values of described gamma coefficient correspondence.When being 0.958: 1: 1.438, can obtain X so under a proportional relationship such as ratio as XYZ _2.2(255)=Y _2.2(255)/0.958, Z _2.2(255)=Y _2.2(255)/1.438, thus obtain high-order tristimulus values X in the tristimulus values of gamma coefficient correspondence _2.2(255), Y _2.2(255) and Z _2.2(255).

The two ends parameter of the gamma that gets access to according to the curvilinear function of gamma coefficient correspondence relation and above-mentioned steps can be revised the gamma of described LCD TV, and the curvilinear function relation of gamma coefficient correspondence can be represented by power function.Can pass through formula in this step:

W _k(n)＝(W _k(255)-W _k(0))×(n÷255) ^k+W _k(0)

Obtain the every rank parameter on the gamma, wherein W represents any component X or Y or the Z in the tristimulus values, and k represents gamma value, and n is the GTG coefficient in 0～255 rank, the first rank of constant 0 expression, and 255 represent high-order.Such as when the k=2.2, the 256 rank parameters of respective components Y are:

Y _2.2(n)＝(Y _2.2(255)-Y _2.2(0))×(n÷255) ^2.2+Y _2.2(0)

In like manner, also can obtain X _2.2(n) and Z _2.2(n).So, just can obtain the gamma coefficient and be 2.2 LCD TV gamma

203. obtain the described signal processing circuit gamma parameter adjusted according to the functional relation of described LCD TV gamma and LCDs gamma and light leak tristimulus values;

This step can obtain whole good described signal processing circuit gamma parameter according to the result of above-mentioned steps acquisition and the functional relation of LCD TV gamma and LCDs gamma and light leak tristimulus values.This step can realize by multiple scheme, the method that combines with fitting algorithm such as the method for exhaustion, fitting algorithm or the method for exhaustion.Following the whole bag of tricks illustrates one by one:

1. the method for exhaustion

The so-called method of exhaustion is meant carries out combination calculation with RGB tristimulus values all in the liquid crystal display screen gamma, obtain different GTG values, thereby from all GTG values that get access to, select one by one near the parameter of each GTG in the LCD TV gamma numerical value, finally obtain the gamma of liquid crystal signal processing circuit as each GTG in the corresponding liquid crystal signal processing circuit gamma.The performing step of this method of exhaustion can comprise the steps:

Make up from any value of 0～255 according to r, g, b in the described functional relation, obtain 256 ³Individual LCDs GTG value, one group of primary colours response in corresponding three the primary colours data response sequences of each GTG value, every group of primary colours response comprises a red, green, blue response respectively.

According to each GTG of LCD TV gamma, from described 256 ³Choose 256 LCDs GTG values in the individual LCDs GTG value near each GTG of LCD TV; Can be such as the 22nd GTG from described 256 according to the LCD TV gamma ³Individual LCDs gamma parameter find near one of this LCD TV gamma the 22nd GTG by

The LCDs GTG value of forming is because the RGB tristimulus values in this GTG value is all known, so promptly know the 22nd rank RGB corresponding response value in the LCD TV signal processing circuit gamma.

So can from 256 LCDs GTG values that select, determine r, g, the b response sequence of described signal processing circuit gamma parameter correspondence, finally obtain described signal processing circuit gamma parameter.

Though the signal processing circuit gamma parameter that this method of exhaustion gets access to is more accurate, operand is bigger, not only will calculate 256 ³Individual LCDs GTG value, but also to judge 256 LCDs GTG values near each GTG in the LCD TV gamma, so the time that needs is longer.

2. fitting algorithm

In order to save time, improve the efficient of the described method of present embodiment, the described signal processing circuit gamma parameter that present embodiment also provides a kind of fitting algorithm to obtain to adjust.This fitting algorithm mainly comprises the steps:

According to the tristimulus values of RGB primary colours data correspondence in the liquid crystal display screen gamma, each the optic response component of each primary colours rank response function in the described liquid crystal display screen gamma is fitted to a high-order moment; Such as with the component X in the response function of red rank _R(r) fit to d ₅r ⁵+ d ₄r ⁴+ d ₃r ³+ d ₂r ²+ d ₁r ¹+ d0, wherein dm is the coefficient after the match, r ^mFor corresponding LCD TV signal processing circuit gamma wait to find the solution red rank parameter, in like manner, Y _R(r) fit to h ₅r ⁵+ h ₄r ⁴+ h ₃r ³+ h ₂r ²+ h ₁r ¹+ h0 exists like this

In 9 components can fit to corresponding high-order moment.

According to the relation of described function and each high-order moment, r, g, the b response sequence that obtains corresponding LCD TV gamma is described signal processing circuit gamma parameter.This step is found the solution by each GTG of corresponding complete machine gamma again, can obtain the RGB rank response of corresponding each GTG of LCD TV, and r, g, b response sequence that the whole RGBs rank response that solves is formed promptly can be the LCD TV gamma.

This fitting algorithm can obtain r, g, b response more accurately by mathematical method, has reduced operand greatly, has guaranteed accurately obtaining of signal processing circuit gamma parameter.

3. the method that combines with fitting algorithm of the method for exhaustion

For the more accurate signal processing circuit gamma parameter of obtaining, present embodiment is in this method that provides a kind of method of exhaustion to combine with fitting algorithm, and this method comprises the steps:

Make up from any value of 0～255 according to r, g, b in the described functional relation, obtain 256 ³Individual LCDs GTG value; This step is identical with step in the above-mentioned method of exhaustion, so repeat no more.

For the pairing low order GTG of predetermined percentage GTG in the LCD TV gamma, from described 256 ³Choose one group of LCDs GTG value in the individual LCDs GTG value, and determine first group of r, g, the b response sequence of described signal processing circuit gamma parameter correspondence according to the one group of LCDs GTG value that selects near the low order GTG; Predetermined percentage is predetermined percentage in this step, and such as when predetermined percentage is 7%, this step just can adopt the method for exhaustion to obtain first group of r, g, b response sequence for the low order GTG of 7% GTG correspondence in the LCD TV gamma.

Each optic response component of each primary colours rank response function in the described LCDs gamma is fitted to a high-order moment; This step is identical with step in above-mentioned your accounting method, so repeat no more.

According to the relation of described function and each high-order moment, obtain second group of r, g, the b response sequence of corresponding other GTGs of LCD TV gamma.This step adopts fitting algorithms to realize for all GTGs beyond 7% in the LCD TV gamma, promptly find the solution by fitting algorithm, can obtain second group of r, g, the b response sequence of corresponding other GTGs of LCD TV gamma for r, the g, the b response that do not obtain in the LCD TV signal processing circuit gamma by the method for exhaustion.

Finally obtain described signal processing circuit gamma parameter according to described first group of r, g, b response sequence and described second group of r, g, b response sequence.

Concrete mode is identical with the method for above-mentioned fitting algorithm record, so repeat no more.

By this step as can be known, the described signal processing circuit gamma parameter of adjusting according to the functional relation acquisition of described LCD TV gamma and LCDs gamma and light leak tristimulus values has multiple scheme, and the user can freely select corresponding method as required in the reality.

204. convert the signal processing circuit gamma parameter of described acquisition to gamma tables, and described gamma tables imported in the described signal processing circuit.

This step converts the LCD TV signal processing circuit gamma parameter that gets access in the step 203 to gamma tables, and described gamma tables imported in the described signal processing circuit, the LCD TV signal processing circuit is exportable adjusted gamma like this, because the every rank of amended signal processing circuit gamma colour mixture ratio is all identical, make the image gray-scale level color of LCDs output be consistent.

The embodiment of the invention is by the functional relation of complete machine gamma and liquid crystal display screen gamma and liquid crystal TV set signal processing circuit gamma, optimize the parameter of RGB in the liquid crystal TV set signal processing circuit gamma, particularly can find the solution the gamma parameter of LCD TV signal processing circuit by the method for exhaustion or fitting algorithm more accurately, guarantee that the image gray-scale level color of LCDs output keeps consistency.

In order better to realize the described method of the foregoing description, the embodiment of the invention also provides a kind of gamma debugging apparatus of LCD TV, this device can be used for the gal of LCD TV is debugged, as shown in Figure 3, Fig. 3 is the functional block diagram of a kind of LCD TV signal processing circuit gamma debugging apparatus of the embodiment of the invention, this device comprises serial ports 301, measuring unit 302, acquiring unit 303 and gamma regulon 304, wherein

Serial ports 301 is used for and waits to transfer the LCD TV signal processing circuit of gamma to link to each other, transmission be sent to described LCD TV signal processing circuit output primary colours data instruction and regulate back gamma parameter;

Measuring unit 302 is used for liquid crystal display screen gamma and light leak tristimulus values at XYZ colour system measurements and calculations liquid crystal display terminal;

Acquiring unit 303 is used to obtain the gamma of LCD TV;

Gamma debugging unit 304, be used for the liquid crystal display screen gamma that the liquid crystal display terminal gamma that gets access to according to described acquiring unit 303 and described measuring unit 302 measure and calculate and the functional relation of light leak tristimulus values and regulate the gamma of liquid crystal display terminal signal processing circuit, described functional relation is:

$\left[\begin{array}{c}{X}_p\left(n\right)\\ Y_p\left(n\right)\\ Z_p\left(n\right)\end{array}\right]=\left[\begin{array}{c}{X}_R\left(r\right)\\ Y_R\left(r\right)\\ Z_R\left(r\right)\end{array}\right]+\left[\begin{array}{c}{X}_G\left(g\right)\\ Y_G\left(g\right)\\ Z_G\left(g\right)\end{array}\right]+\left[\begin{array}{c}{X}_B\left(b\right)\\ Y_B\left(b\right)\\ Z_B\left(b\right)\end{array}\right]+\left[\begin{array}{c}{X}_L\\ Y_L\\ Z_L\end{array}\right]$

Wherein

Expression LCD TV gamma, n is the GTG coefficient of LCD TV 0～255, p is the gamma value of LCD TV,

Expression liquid crystal display screen gamma, r, g, b are respectively the red, green, blue primary colours data response sequence that described LCD TV signal processing circuit waits to transfer gamma,

Be the light leak tristimulus values.

Wherein gamma value that acquiring unit 303 can be by LCD TV or the tristimulus values that receives are obtained the gamma of LCD TV.Such as when gamma value is 2.2, can obtain the gamma of LCD TV according to the exponential curve of this gamma value correspondence.The gamma that obtains LCD TV by the tristimulus values that receives mainly is the gamma that obtains LCD TV according to the tristimulus values of the high-order primary colours data in described light leak tristimulus values and the described LCDs gamma.The high-order primary colours data tristimulus values of corresponding described LCDs is XR (255), YR (255), ZR (255), XG (255), YG (255), ZG (255), XB (255), YB (255), ZB (255).

Gamma debugging unit 304 can comprise in the present embodiment:

Acquisition module 341 is used for the described signal processing circuit gamma parameter of adjusting according to the functional relation acquisition of described LCD TV gamma and LCDs gamma and light leak tristimulus values;

Adjustment module 342 is used for converting the signal processing circuit gamma parameter that described acquisition module 341 obtains to gamma tables, and described gamma tables is imported in the described signal processing circuit.

Wherein said acquisition module 341 is when the described signal processing circuit gamma parameter that obtains according to the functional relation of described LCD TV gamma and LCDs gamma and light leak tristimulus values to adjust, can make up from any value of 0～255 according to r, g, b in the described functional relation, obtain 256 ³Individual LCDs GTG value is according to each GTG of LCD TV gamma, from described 256 ³Choose in the individual LCDs GTG value near 256 LCDs GTG values of each GTG of LCD TV, determine r, g, the b response sequence of described signal processing circuit gamma parameter correspondence according to 256 LCDs GTG values that select.Can also be according to the tristimulus values of RGB primary colours data correspondence in the LCDs gamma, each optic response component of each primary colours rank response function in the described LCDs gamma is fitted to a high-order moment, according to the relation of described function and each high-order moment, r, g, the b response sequence that obtains corresponding LCD TV gamma is described signal processing circuit gamma parameter.Can also make up from any value of 0～255 according to r, g, b in the described functional relation, obtain 256 ³Individual LCDs GTG value; For the pairing low order GTG of 7% GTG in the LCD TV gamma, from described 256 ³Choose one group of LCDs GTG value in the individual LCDs GTG value, and determine first group of r, g, the b response sequence of described signal processing circuit gamma parameter correspondence according to the one group of LCDs GTG value that selects near the low order GTG; According to the tristimulus values of RGB primary colours data correspondence in the LCDs gamma, each the optic response component of each primary colours rank response function in the described LCDs gamma is fitted to a high-order moment; According to the relation of described function and each high-order moment, obtain second group of r, g, the b response sequence of corresponding other GTGs of LCD TV gamma; And obtain described signal processing circuit gamma parameter according to described first group of r, g, b response sequence and described second group of r, g, b response sequence.Can obtain the gamma parameter of LCD TV signal processing circuit accurately and rapidly by acquisition module 341.Make the image gray-scale level color of LCDs output be consistent.

The embodiment of the invention also provides a kind of gamma debug system of LCD TV signal processing circuit, as shown in Figure 4, Fig. 4 is the structured flowchart of a kind of LCD TV signal processing circuit gamma debug system of the embodiment of the invention, as can be seen from Figure 4 this system comprises LCD TV signal processing circuit 401, computer 402 and collecting device 403, wherein LCD TV signal processing circuit 401 and computer 402 link to each other by serial ports

LCD TV signal processing circuit 401 is used for exporting the primary colours data according to the instruction of computer 402 by rank;

Data acquisition end 403 is used for pursuing the tristimulus values that primary colours data correspondence is exported on rank according to the instruction acquisition LCD TV signal processing circuit 401 of computer 402, and the tristimulus values of every rank primary colours data correspondence is sent to computer 402;

Computer 402 is used for sending to described treatment circuit 401 instruction of output primary colours data; Also be used for sending the instruction of gathering the primary colours data to data acquisition end 403, and the liquid crystal display screen gamma formed of the tristimulus values that receives each rank primary colours data of corresponding LCD TV signal processing circuit 401 outputs that data acquisition end 403 sends, obtain the gamma of LCD TV, and from described tristimulus values, obtain the light leak tristimulus values of corresponding LCDs, regulate the gamma of liquid crystal also television signal processing circuit according to the functional relation of LCD TV gamma and liquid crystal display screen gamma and light leak tristimulus values, described functional relation is:

$\left[\begin{array}{c}{X}_p\left(n\right)\\ Y_p\left(n\right)\\ Z_p\left(n\right)\end{array}\right]=\left[\begin{array}{c}{X}_R\left(r\right)\\ Y_R\left(r\right)\\ Z_R\left(r\right)\end{array}\right]+\left[\begin{array}{c}{X}_G\left(g\right)\\ Y_G\left(g\right)\\ Z_G\left(g\right)\end{array}\right]+\left[\begin{array}{c}{X}_B\left(b\right)\\ Y_B\left(b\right)\\ Z_B\left(b\right)\end{array}\right]+\left[\begin{array}{c}{X}_L\\ Y_L\\ Z_L\end{array}\right]$

Wherein Expression LCD TV gamma, n is the GTG coefficient of LCD TV 0～255, p is the gamma value of LCD TV,

Expression liquid crystal display screen gamma, r, g, b are respectively the red, green, blue primary colours data response sequence that described LCD TV signal processing circuit waits to transfer gamma,

Be the light leak tristimulus values.

Computer 402 sends the instruction of output primary colours data according to triggering signal in the present embodiment, and this starting signal can be the striking signal that the user imports, the striking signal that sends such as striking mouse, keyboard or touch-screen; It can also be the response signal that data acquisition end 403 feedbacks are gathered the primary colours data command.Computer 402 receives a triggering signal and just sends an instruction that requires LCD TV signal processing circuit 401 output primary colours data, and LCD TV signal processing circuit 401 is exported corresponding primary colours data according to the instruction that computer 402 sends.The order of the collection primary colours data that data acquisition end 403 sends one by one according to computer 402, gather the primary colours data of LCD TV 401 by rank output, obtain the tristimulus values of every rank primary colours data correspondence, and the tristimulus values of every rank primary colours data correspondence sent to computer 402, so can finish the transmission of the tristimulus values of 768 RGB primary colours data correspondences.The tristimulus values that computer 402 receives all RGB primary colours data correspondences of data acquisition end 403 transmissions promptly can be considered the liquid crystal display screen gamma, obtain the gamma of LCD TV, and from described tristimulus values, obtain the light leak tristimulus values of corresponding LCDs, regulate the gamma of liquid crystal also television signal processing circuit according to the functional relation of LCD TV gamma and liquid crystal display screen gamma and light leak tristimulus values, described functional relation is:

$\left[\begin{array}{c}{X}_p\left(n\right)\\ Y_p\left(n\right)\\ Z_p\left(n\right)\end{array}\right]=\left[\begin{array}{c}{X}_R\left(r\right)\\ Y_R\left(r\right)\\ Z_R\left(r\right)\end{array}\right]+\left[\begin{array}{c}{X}_G\left(g\right)\\ Y_G\left(g\right)\\ Z_G\left(g\right)\end{array}\right]+\left[\begin{array}{c}{X}_B\left(b\right)\\ Y_B\left(b\right)\\ Z_B\left(b\right)\end{array}\right]+\left[\begin{array}{c}{X}_L\\ Y_L\\ Z_L\end{array}\right]$

Wherein

Expression LCD TV gamma, n is the GTG coefficient of LCD TV 0～255, p is the gamma value of LCD TV,

Expression liquid crystal display screen gamma, r, g, b are respectively the red, green, blue primary colours data response sequence that described LCD TV signal processing circuit waits to transfer gamma,

Be the light leak tristimulus values.

The described system of the embodiment of the invention can debug the gamma of LCD TV signal processing circuit, and the every rank of amended signal processing circuit gamma colour mixture ratio is all identical, makes the image gray-scale level color of debugging back LCDs output be consistent.

The foregoing description is the example explanation with the LCD TV; those skilled in the art can know that liquid crystal apparatus such as understanding LCD also can realize the described primary colours data output of the embodiment of the invention; so above-described specific embodiment; to purpose of the present invention; technical scheme and beneficial effect further describe; institute is understood that; the above only is specific embodiments of the invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all; any modification of being made; be equal to replacement; improve etc., all should be included within protection scope of the present invention.

Claims (10)

1. a liquid crystal display gamma debugging method is characterized in that, described method comprises:

Liquid crystal display screen gamma and light leak tristimulus values at XYZ colour system measurements and calculations liquid crystal display terminal;

Obtain the liquid crystal display terminal gamma;

Regulate the gamma of signal processing circuit in the liquid crystal display terminal according to the functional relation of liquid crystal display terminal gamma and liquid crystal display screen gamma and light leak tristimulus values, described functional relation is:

Wherein

Expression liquid crystal display terminal gamma, n is the GTG coefficient of liquid crystal display terminal 0～255, p is the gamma value of liquid crystal display terminal,

Expression liquid crystal display screen gamma, r, g, b are respectively the red, green, blue primary colours data response sequence that described signal processing circuit waits to transfer gamma,

Be the light leak tristimulus values.

2. method according to claim 1 is characterized in that, described liquid crystal display terminal gamma comprises three gamma curve, and described three gamma curve overlap, and are the exponential curve of 2.2 powers.

3. method according to claim 1 and 2 is characterized in that, the described gamma that obtains liquid crystal display terminal comprises:

Obtain the gamma of liquid crystal display terminal according to the tristimulus values of the high-order primary colours data in described light leak tristimulus values and the described liquid crystal display screen gamma.

4. method according to claim 1 and 2, it is characterized in that the gamma that described functional relation according to liquid crystal display terminal gamma and liquid crystal display screen gamma and light leak tristimulus values is regulated signal processing circuit in the liquid crystal display terminal comprises: the gamma parameter of the described signal processing circuit of adjusting according to the functional relation acquisition of liquid crystal display terminal gamma and liquid crystal display screen gamma and light leak tristimulus values;

Convert described gamma parameter to gamma tables, and described gamma tables is imported in the described signal processing circuit.

5. method according to claim 4 is characterized in that, the gamma parameter that described functional relation according to liquid crystal display terminal gamma and liquid crystal display screen gamma and light leak tristimulus values obtains the described signal processing circuit adjusted comprises:

Make up from any value of 0～255 according to r, g, b in the described functional relation, obtain 256 ³Individual LCDs GTG value;

According to each GTG of liquid crystal display terminal gamma, from described 256 ³Choose 256 LCDs GTG values in the individual LCDs GTG value near each GTG of liquid crystal display terminal;

Determine r, g, the b response sequence of described gamma parameter correspondence according to 256 LCDs GTG values that select.

6. method according to claim 4 is characterized in that, the gamma parameter that described functional relation according to liquid crystal display terminal gamma and liquid crystal display screen gamma and light leak tristimulus values obtains the described signal processing circuit adjusted also comprises:

Each optic response component of each primary colours rank response function in the described liquid crystal display screen gamma is fitted to a high-order moment;

According to the relation of described function and each high-order moment, r, g, the b response sequence that obtains corresponding liquid crystal display terminal gamma is described gamma parameter.

7. method according to claim 4 is characterized in that, the gamma parameter that described functional relation according to liquid crystal display terminal gamma and liquid crystal display screen gamma and light leak tristimulus values obtains the described signal processing circuit adjusted also comprises:

Make up from any value of 0～255 according to r, g, b in the described functional relation, obtain 256 ³Individual liquid crystal display screen GTG value;

For the pairing low order GTG of predetermined percentage GTG in the liquid crystal display terminal gamma, from described 256 ³Choose one group of LCDs GTG value of the most approaching described low order GTG in the individual LCDs GTG value, and determine first group of r, g, the b response sequence of described gamma parameter correspondence according to the one group of liquid crystal display screen GTG value that selects;

Each optic response component of each primary colours rank response function in the described liquid crystal display screen gamma is fitted to a high-order moment;

According to the relation of described function and each high-order moment, obtain second group of r, g, the b response sequence of corresponding other GTGs of liquid crystal display terminal gamma;

Obtain described gamma parameter according to described first group of r, g, b response sequence and described second group of r, g, b response sequence.

8. liquid crystal display gamma debugging apparatus is characterized in that described device comprises:

Serial ports is used for linking to each other with the signal processing circuit of the liquid crystal display terminal of waiting to transfer gamma, transmission be sent to described signal processing circuit output primary colours data instruction and regulate back gamma parameter;

Measuring unit is used for liquid crystal display screen gamma and light leak tristimulus values at XYZ colour system measurements and calculations liquid crystal display terminal;

Acquiring unit is used to obtain the liquid crystal display terminal gamma;

The gamma debugging unit, be used for the liquid crystal display screen gamma that the liquid crystal display terminal gamma that gets access to according to described acquiring unit and described measuring unit measure and calculate and the functional relation of light leak tristimulus values and regulate the gamma of liquid crystal display terminal signal processing circuit, described functional relation is:

Wherein

Expression liquid crystal display terminal gamma, n is the GTG coefficient of liquid crystal display terminal 0～255, p is the gamma value of liquid crystal display terminal, Expression liquid crystal display screen gamma, r, g, b are respectively the red, green, blue primary colours data response sequence that described liquid crystal display terminal signal processing circuit waits to transfer gamma,

Be the light leak tristimulus values.

9. device according to claim 8 is characterized in that, described gamma debugging unit comprises:

Acquisition module is used for obtaining according to the functional relation of described liquid crystal display terminal gamma and liquid crystal display screen gamma and light leak tristimulus values the gamma parameter of the described signal processing circuit adjusted;

Adjustment module is used for converting the described signal processing circuit gamma parameter that described acquisition module obtains to gamma tables, and described gamma tables is imported in the described signal processing circuit.

10. liquid crystal display gamma debug system is characterized in that described system comprises:

The liquid crystal display terminal signal processing circuit is used for exporting the primary colours data according to the instruction of computer by rank;

The data acquisition end is used for according to the tristimulus values of the described signal processing circuit of the instruction acquisition of computer by rank output primary colours data correspondence, and the tristimulus values of every rank primary colours data correspondence is sent to computer;

Computer is used for sending to described liquid crystal display terminal signal processing circuit the instruction of output primary colours data; Also be used for sending the instruction of gathering the primary colours data to the data acquisition end, and the liquid crystal display screen gamma formed of the tristimulus values that receives each rank primary colours data of the corresponding described signal processing circuit output that the data acquisition end sends, obtain the gamma of liquid crystal display terminal, and from described tristimulus values, obtain the light leak tristimulus values of corresponding LCDs, regulate the gamma of liquid crystal display terminal signal processing circuit according to the functional relation of liquid crystal display terminal gamma and liquid crystal display screen gamma and light leak tristimulus values, described functional relation is:

Wherein Expression liquid crystal display terminal gamma, n is the GTG coefficient of liquid crystal display terminal 0～255, p is the gamma value of liquid crystal display terminal, Expression liquid crystal display screen gamma, r, g, b are respectively the red, green, blue primary colours data response sequence that described liquid crystal display terminal signal processing circuit waits to transfer gamma, Be the light leak tristimulus values.

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