WO2017084424A1

WO2017084424A1 - Chroma adjustment method and device for liquid crystal display screen

Info

Publication number: WO2017084424A1
Application number: PCT/CN2016/098787
Authority: WO
Inventors: 宁超; 曹谦; 苏文华; 姚键; 潘柏宇; 王冀
Original assignee: 合一智能科技（深圳）有限公司
Priority date: 2015-11-18
Filing date: 2016-09-13
Publication date: 2017-05-26
Also published as: CN105304062B; CN105304062A

Abstract

A chroma adjustment method and device for a liquid crystal display screen. The method comprises: measuring chroma coordinates at a minimum gray-scale value and a maximum gray-scale value of a display screen to be adjusted; setting chroma coordinates of a critical gray-scale value of the display screen to be adjusted to be the chroma coordinates of the maximum gray-scale value; according to the chroma coordinates of the minimum gray-scale value and the critical gray-scale value of the display screen to be adjusted, and reference chroma coordinates between a minimum gray-scale value and a critical gray-scale value of a standard display screen, respectively calculating chroma coordinates of each gray-scale value between the minimum gray-scale value and the critical gray-scale value of the display screen to be adjusted; and according to the chroma coordinates of each gray-scale value between the minimum gray-scale value and the critical gray-scale value of the display screen to be adjusted, adjusting the chroma of the display screen to be adjusted. By means of the chroma adjustment method and device for a liquid crystal display screen, the chroma of a display screen can be automatically and accurately adjusted by utilizing an instrument, so that the chroma debugging efficiency of the display screen can be greatly improved.

Description

Method and device for adjusting color of liquid crystal display

cross reference

The present application claims priority to Chinese Patent Application No. 20151079594, filed on Nov. 18, 2015, the entire content of

Technical field

The present invention relates to the field of liquid crystal display, and more particularly to a method and device for adjusting the chromaticity of a liquid crystal display.

Background technique

As a widely used display device, LCD screens have penetrated into various fields of people's lives. They can display rich colors and reproduce the rich details of low-gray scenes (pictures) and high-gray scenes. The human eye is especially sensitive to low-gray pictures, and it is easier to distinguish the deviation of color and brightness in a dark picture. Therefore, the process of low gray level in the process of debugging the liquid crystal display is particularly important, it will directly affect the performance of the display.

At present, the method of adjusting the low gray level chromaticity and brightness is mainly based on the fact that the human eye does not observe the obvious taste problem as the ultimate goal, or the instrument is used to measure the liquid crystal display, and then the debugging is performed according to the measurement result, so that The brightness and chromaticity are basically smooth and excessive.

For the adjustment of the brightness, it can be done automatically by means of the instrument, or with a small amount of manual adjustment.

However, for the adjustment of chromaticity, since the change process of chromaticity at low gray level is not linear, and there is no clear formula, that is, there is no clear target chromaticity value, it is difficult to adjust with an instrument.

In this regard, the more common practice at present is to adjust the low-gray scale step by step with the human eye. It makes it look like the chromaticity is basically smooth transition, so that not only the adjustment efficiency is low, but also due to the visual difference of each person, the adjusted chromaticity may also be greatly different.

Summary of the invention

technical problem

In view of this, the technical problem to be solved by the present invention is how to automatically and accurately adjust the chromaticity of the liquid crystal display.

solution

According to an aspect of the present invention, a method for adjusting a chromaticity of a liquid crystal display panel includes: measuring chromaticity coordinates of a display screen to be adjusted at a minimum grayscale value and a maximum grayscale value; The chromaticity coordinate of the critical grayscale value is set as the chromaticity coordinate of the maximum grayscale value; the chromaticity coordinate according to the minimum grayscale value and the critical grayscale value of the display to be adjusted, and the minimum from the standard display screen a reference chromaticity coordinate between the grayscale value and the critical grayscale value, respectively calculating chromaticity coordinates of each grayscale value between the minimum grayscale value and the critical grayscale value of the to-be-adjusted display screen; The chromaticity of the display screen to be adjusted is adjusted by adjusting the chromaticity coordinates of the grayscale values between the minimum grayscale value and the critical grayscale value of the display screen.

For the above chromaticity adjustment method, in a possible implementation manner, according to the minimum gray scale value of the display screen to be adjusted and the chromaticity coordinate of the critical gray scale value, and the minimum gray scale value of the standard display screen to the critical value a reference chromaticity coordinate between grayscale values, respectively calculating chromaticity coordinates of each grayscale value between the minimum grayscale value and the critical grayscale value of the to-be-adjusted display screen, including: first chromaticity coordinate calculation step a first chromaticity coordinate according to a first chromaticity coordinate in a reference chromaticity coordinate of the standard display screen, a minimum grayscale value of the to-be-adjusted display screen, and a chromaticity coordinate of a critical grayscale value, Calculating a first chromaticity coordinate of each grayscale value between the minimum grayscale value and the critical grayscale value of the to-be-adjusted display screen; and a second chromaticity coordinate calculating step, according to the display screen to be adjusted a first chromaticity coordinate of each grayscale value between a minimum grayscale value and a critical grayscale value, and a reference chromaticity of the standard display screen The first chromaticity coordinate and the second chromaticity coordinate of the target are used to calculate a second chromaticity coordinate of each grayscale value between the minimum grayscale value and the critical grayscale value of the to-be-adjusted display screen.

For the chromaticity adjustment method described above, in a possible implementation manner, the following formula 1 is used in the first chromaticity coordinate calculation step to calculate the display screen to be adjusted from a minimum grayscale value to a critical grayscale value. The first chromaticity coordinate of each grayscale value between,

Where M is the minimum grayscale value, N is the critical grayscale value, M<i<N and is an integer;

x _M represents the first chromaticity coordinate in the reference chromaticity coordinate of the minimum gray scale value M of the standard display screen, and x _i represents the minimum gray scale value M to the critical gray scale value N of the standard display screen a first chromaticity coordinate in reference chromaticity coordinates of each grayscale value i, x _N representing a first chromaticity coordinate in a reference chromaticity coordinate of a critical grayscale value N of the standard display screen;

x' _M denotes a first chromaticity coordinate in the chromaticity coordinate of the minimum grayscale value M of the display to be adjusted, and x' _i denotes a minimum grayscale value M to a critical grayscale value of the display to be adjusted The first chromaticity coordinate in the chromaticity coordinates of each gray scale value i between N, x' _N represents the first chromaticity coordinate in the chromaticity coordinates of the critical grayscale value N of the display screen to be adjusted.

For the chromaticity adjustment method, in a possible implementation manner, in the second chromaticity coordinate calculation step, the following formula 2 is used to calculate the display screen to be adjusted from the minimum grayscale value to the critical grayscale value. The second chromaticity coordinate of each grayscale value,

Where d _M = y _{M -} x _M , y _M represents the second chromaticity coordinate in the reference chromaticity coordinates of the minimum gray scale value M of the standard display screen;

d _i = y _{i -} x _i , y _i represents the second chromaticity coordinate in the reference chromaticity coordinates of each gray scale value i between the minimum gray scale value M and the critical gray scale value N of the standard display screen ;

d _N = y _{N -} x _N , y _N represents the second chromaticity coordinate in the reference chromaticity coordinate of the critical gray scale value N of the standard display screen;

D' _M = y ' _{M -} x ' _M , y ' _M represents the second chromaticity coordinate in the chromaticity coordinates of the minimum gray scale value M of the display screen to be adjusted;

d' _i =y' _i -x' _i , y' _i represents the second of the chromaticity coordinates of the gray scale values i between the minimum gray scale value M and the critical gray scale value N of the display screen to be adjusted Chromaticity coordinates;

d' _N = y ' _{N -} x ' _N , y ' _N represents the second chromaticity coordinate in the chromaticity coordinates of the critical gray scale value N of the display screen to be adjusted.

For the foregoing color adjustment method, in a possible implementation manner, the method further includes:

A liquid crystal display whose optical parameter is at an intermediate value is selected from a plurality of liquid crystal displays as the standard display screen.

According to another aspect of the present invention, a chromaticity adjusting apparatus for a liquid crystal display panel includes: a measuring module for measuring chromaticity coordinates of a display screen to be adjusted at a minimum grayscale value and a maximum grayscale value; and a setting module And the measurement module is connected to set a chromaticity coordinate of a critical grayscale value of the to-be-adjusted display screen to a chromaticity coordinate of the maximum grayscale value; a chromaticity coordinate calculation module, respectively, and the measurement a module and the setting module are connected, according to a chromaticity coordinate of a minimum grayscale value and a critical grayscale value of the display screen to be adjusted, and a minimum grayscale value to a critical grayscale value of the standard display screen Calculating chromaticity coordinates of each grayscale value between the minimum grayscale value and the critical grayscale value of the to-be-adjusted display screen, and a chromaticity adjustment module, connected to the chromaticity coordinate calculation module, with reference to chromaticity coordinates And modulating the chromaticity of the to-be-adjusted display screen according to the chromaticity coordinates of the grayscale values between the minimum grayscale value and the critical grayscale value of the display screen to be adjusted.

In a possible implementation manner, the chromaticity coordinate calculation module includes: a first chromaticity coordinate calculation module, configured to be first according to reference chromaticity coordinates of the standard display screen Chromaticity coordinates, the minimum grayscale value of the display to be adjusted, and the chroma of the critical grayscale value a first chromaticity coordinate in the coordinate to calculate a first chromaticity coordinate of each grayscale value between the minimum grayscale value and the critical grayscale value of the to-be-adjusted display screen; the second chromaticity coordinate calculation module, The first chromaticity coordinate calculation module is connected to the first chromaticity coordinate of each grayscale value between the minimum grayscale value and the critical grayscale value according to the to-be-adjusted display screen, and the standard display screen A second chromaticity coordinate of each grayscale value between the minimum grayscale value and the critical grayscale value of the to-be-adjusted display screen is calculated by referring to the first chromaticity coordinate and the second chromaticity coordinate in the chromaticity coordinate.

In a possible implementation manner, the first chromaticity coordinate calculation module calculates, by using Equation 1 below, the display screen to be adjusted from a minimum grayscale value to a critical grayscale value. The first chromaticity coordinate of each grayscale value,

In a possible implementation manner, the second chromaticity coordinate calculation module calculates the to-be-adjusted display screen from a minimum grayscale value to a critical grayscale value by using Equation 2 below. The second chromaticity coordinate of each grayscale value,

For the above-mentioned color adjustment device, in one possible implementation manner, the method further includes:

And a selection module, coupled to the chromaticity coordinate calculation module, for selecting a liquid crystal display having an optical parameter at an intermediate value from the plurality of liquid crystal displays as the standard display screen.

Beneficial effect

According to the chromaticity adjustment method and apparatus of the liquid crystal display provided by the embodiment, the chromaticity coordinates of the low gray scales of the other display screens to be adjusted can be calculated by using the chromaticity coordinates of the low gray scales as the standard display screen. Thus, the chromaticity of the display screen is adjusted according to the calculated chromaticity coordinates of each low gray level to obtain a display screen with good optical parameters and no obvious taste problems observed by the human eye. According to the chromaticity adjusting method and apparatus of the present embodiment, the chromaticity of the display screen can be automatically and accurately adjusted by the instrument, so that the chromaticity debugging efficiency of the display screen can be greatly improved.

Further features and aspects of the present invention will become apparent from the following detailed description of exemplary embodiments. The face will become clear.

DRAWINGS

The accompanying drawings, which are incorporated in FIG

1 is a flow chart showing a method of adjusting a chromaticity of a liquid crystal display according to an embodiment of the present invention;

Figure 2 shows a chromaticity diagram of a standard display screen;

Figure 3 shows a comparison of chromaticity curves of a standard display screen and a display screen after chroma debugging;

4 is a comparison diagram of chromaticity curves of a low-gray portion of a standard display screen and a display screen after chroma debugging;

FIG. 5 is a block diagram showing the structure of a chromaticity adjusting device of a liquid crystal display according to an embodiment of the present invention; FIG.

FIG. 6 is a block diagram showing the structure of a chromaticity adjusting device of a liquid crystal display according to an embodiment of the present invention.

detailed description

Various exemplary embodiments, features, and aspects of the invention are described in detail below with reference to the drawings. The same reference numerals in the drawings denote the same or similar elements. Although the various aspects of the embodiments are illustrated in the drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustrative." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or preferred.

In addition, numerous specific details are set forth in the Detailed Description of the invention in the Detailed Description. Those skilled in the art will appreciate that the invention may be practiced without some specific details. In some instances, methods, means, components, and circuits that are well known to those skilled in the art are not described in detail in order to facilitate the invention.

Example 1

1 shows a flow chart of a chromaticity adjustment method of a liquid crystal display according to an embodiment of the present invention. As shown in FIG. 1, the chromaticity adjustment method can mainly include the following steps:

Step S100: measuring chromaticity coordinates of the minimum gray scale value and the maximum gray scale value of the display screen to be adjusted;

Step S101: setting a chromaticity coordinate of a critical grayscale value of the display screen to be adjusted to a chromaticity coordinate of a maximum grayscale value;

Step S102: Calculate to be adjusted according to the minimum gray scale value of the display screen to be adjusted and the chromaticity coordinate of the critical gray scale value, and the reference chromaticity coordinate of the standard display screen from the minimum grayscale value to the critical grayscale value. The chromaticity coordinates of the grayscale values between the minimum grayscale value and the critical grayscale value of the display;

Step S103: Adjust the chromaticity of the display screen to be adjusted according to the chromaticity coordinates of the grayscale values between the minimum grayscale value and the critical grayscale value of the display screen to be adjusted.

For the above-mentioned step S100, in a possible implementation manner, the brightness of the display screen to be adjusted may be adjusted first, and specifically, the brightness thereof may be adjusted to a predetermined gamma curve, for example, adjusted to a gamma2.2 curve. Then, the display to be adjusted is placed in a white balance state, and the chromaticity coordinates of the minimum gray scale value and the maximum gray scale value of the display to be adjusted are measured. The grayscale value of the display to be adjusted may be, for example, 0 to 255. In this case, the minimum grayscale value is 0, and the maximum grayscale value is 255. In general, the chromaticity coordinates can be expressed as (x, y).

For the above step S101, in the display screen, there is usually a critical gray scale. From the minimum gray level to the critical gray level, the chromaticity of the display is gradually changing. However, as the gray level increases, the human eye cannot see a significant color deviation. Therefore, when performing the chromaticity adjustment of the display screen, the chromaticity coordinates of the display to be adjusted from the critical grayscale value to the maximum grayscale value are usually adjusted to be consistent. In a possible implementation manner, the chromaticity coordinates of the critical gray scale value to the large gray scale value are all adjusted to the chromaticity coordinates of the maximum gray scale value.

For the above step S102, in a possible implementation, the first chromaticity may be mainly included. A coordinate calculation step (step S1021) and a second chromaticity coordinate calculation step (step S1022).

In the first chromaticity coordinate calculation step, the first one of the first chromaticity coordinates in the reference chromaticity coordinate of the standard display screen, the minimum grayscale value of the display screen to be adjusted, and the chromaticity coordinate of the critical grayscale value The chromaticity coordinates are used to calculate the first chromaticity coordinates of the grayscale values between the minimum grayscale value and the critical grayscale value of the display to be adjusted.

Specifically, when performing chromaticity adjustment on a batch of display screens, first select a standard display screen as a reference, and after adjusting the brightness of the standard display screen to a predetermined gamma curve, for example, a gamma2.2 curve, The standard display is placed in a white balance state to adjust the chromaticity of the standard display so that the chromaticity of the display maintains a smooth transition, and no obvious taste problems are observed by the human eye. There are various methods for determining the standard display. In one possible implementation, the optical parameters of multiple liquid crystal displays can be measured in advance, and the liquid crystal display whose optical parameters are at the intermediate value is selected from these liquid crystal displays. As a standard display. The optical parameter may be the brightness and chromaticity of the liquid crystal display. By selecting the liquid crystal display with the optical parameter at the middle value as the standard display screen, the deviation of the chromaticity between the display to be adjusted and the standard display can be reduced, thereby saving the subsequent adjustment into good optical parameters and no obvious observation by the human eye. The time to taste the display of the problem.

As shown in FIG. 2, the standard display screen after the above chromaticity adjustment corresponds to a relatively good chromaticity curve, and the chromaticity curve is used as a reference chromaticity curve for subsequent adjustment. Then, according to the reference chromaticity curve, the chromaticity value of each grayscale value, that is, the reference chromaticity coordinate, can be recorded for each grayscale value of the standard display screen. In a possible implementation manner, the grayscale value is 0-255, and the reference chromaticity coordinates of each grayscale value may be expressed as (x _i , y _i ), where i=0, 1, 2, . . . 255 .

Since the chromaticity trends of the respective display screens are substantially identical, that is, they are all curved shapes as shown in FIG. Therefore, the chromaticity coordinates of the gray scales of the standard display screen can be used to calculate the chromaticity coordinates of the respective gray scales corresponding to the display screens to be adjusted.

Specifically, in the first chromaticity coordinate calculation step, the standard display screen can be utilized most a small grayscale value, a first chromaticity coordinate from a minimum grayscale value to a critical grayscale value, a reference chromaticity coordinate of the critical grayscale value, and a minimum of the display to be adjusted measured or set in steps S100, S101 a gray scale value, a first chromaticity coordinate in a chromaticity coordinate of the critical gray scale value, to calculate each gray scale value, ie, a low gray scale value, from the minimum gray scale value to the critical gray scale value of the display screen to be adjusted The first chromaticity coordinate of the chromaticity coordinates.

For example, the grayscale range of the display is 0-255, where the minimum grayscale value is 0 and the critical grayscale value is 20. You can use the 0 grayscale, 1 grayscale, 20 grayscale reference of the standard display. The first chromaticity coordinates x ₀ , x ₁ , x ₂₀ in the chromaticity coordinates, and the first chromaticity coordinates x′ ₀ , x′ ₂₀ in the chromaticity coordinates of the 0 gray scale and the 20 gray scale of the display screen to be adjusted To calculate the first chromaticity coordinate x' ₁ in the chromaticity coordinates of the 1 gray scale of the display to be adjusted. By analogy, the first chromaticity coordinates x'2, ... x'19 in the chromaticity coordinates of the 2 to 19 gray scales of the display screen to be adjusted can be calculated.

In the second chromaticity coordinate calculation step, according to the first chromaticity coordinate of each gray scale value between the minimum gray scale value and the critical gray scale value of the display screen to be adjusted, in the reference chromaticity coordinate of the standard display screen The first chromaticity coordinate and the second chromaticity coordinate are used to calculate a second chromaticity coordinate of each grayscale value between the minimum grayscale value and the critical grayscale value of the display screen to be adjusted.

Specifically, in the second chromaticity coordinate calculation step, the first chromaticity coordinate (measured in step S100) in the chromaticity coordinates of the minimum grayscale value of the display screen to be adjusted may be utilized, and the minimum grayscale is obtained. a first chromaticity coordinate in the chromaticity coordinate of the value to the critical grayscale value (calculated in the first chromaticity coordinate calculation step described above), and a first chromaticity coordinate in the chromaticity coordinate of the critical grayscale value (in the The first chromaticity coordinate and the second chromaticity in the reference chromaticity coordinate of the standard display screen, the minimum gray scale value of the standard display screen, the minimum gray scale value, the critical gray scale value, and the reference chromaticity value of the critical gray scale value are obtained in the above step S101. Coordinates, to calculate a second chromaticity coordinate of each grayscale value between the minimum grayscale value and the critical grayscale value of the display to be adjusted.

For example, the first chromaticity coordinate x' ₀ in the chromaticity coordinates of the 0 gray scale of the display screen to be adjusted, and the first chromaticity coordinate x' ₁ , 20 gray scale in the chromaticity coordinates of the gray scale may be utilized. The first chromaticity coordinate x' ₂₀ in the chromaticity coordinates, the first chromaticity coordinates x ₀ , x ₁ , x ₂₀ in the reference chromaticity coordinates, and the chromaticity coordinates of the 0 gray scale of the standard display screen (x ₀ , y ₀ ), the chromaticity coordinates (x ₁ , y ₁ ) of the 1 gray scale of the standard display screen, and the chromaticity coordinates (x ₂₀ , y ₂₀ ) of the 20 gray scales of the standard display screen to calculate the display to be adjusted The second chromaticity coordinate y' ₁ in the chromaticity coordinates of the 1 gray scale, and so on, can calculate the second chromaticity coordinate y' ₂ in the chromaticity coordinates of the 2 to 19 gray scale of the display screen to be adjusted. ,......y' ₁₉ .

Thus, by the first chromaticity coordinate calculation step and the second chromaticity coordinate calculation step, it is possible to calculate the gray scale values (ie, low gray scale) of the display screen to be adjusted from the minimum grayscale value to the critical grayscale value. Chroma coordinates.

For the above step S103, the chromaticity of the display screen to be adjusted can be adjusted according to the calculated chromaticity coordinates of the respective grayscale values from the minimum grayscale value to the critical grayscale value. Specifically, the chromaticity coordinates of the minimum gray scale value obtained from the measurement, the calculated chromaticity coordinates from the minimum gray scale value to the critical gray scale value, and the chromaticity coordinates from the critical gray scale value to the maximum gray scale value may be calculated. (The chromaticity coordinates are set to the measured maximum grayscale value) to adjust the chromaticity of the display.

In addition, since the change trend of the first chromaticity coordinate and the second chromaticity coordinate in the chromaticity coordinates of each display screen is substantially consistent, in a possible implementation manner, the first chromaticity coordinate may be utilized. The method illustrated in the calculating step calculates the second chromaticity coordinates, and correspondingly, the first chromaticity coordinates are calculated using the method described in the second chromaticity coordinate calculating step.

According to the chromaticity adjustment method of the liquid crystal display provided by the embodiment, the chromaticity coordinates of the low gray scales of the other display screens to be adjusted can be calculated by using the chromaticity coordinates of the low gray scales as the standard display screen, thereby The chromaticity of the display screen is adjusted based on the calculated chromaticity coordinates of each low gray level to obtain a display screen with good optical parameters and no obvious taste problems observed by the human eye. According to the chromaticity adjustment method of the present embodiment, the chromaticity of the display screen can be automatically and accurately adjusted by the instrument, so that the chromaticity debugging efficiency of the display screen can be greatly improved.

Example 2

The main difference between this embodiment and the above embodiment 1 is that the first chromaticity coordinate calculation step is performed. Specifically, the first chromaticity coordinate of each gray scale value between the minimum gray scale value and the critical gray scale value of the display screen to be adjusted may be calculated by using Equation 1 below.

Wherein, the above formula 1 can be specifically derived from the following formula 3,

In the above formulas 1, 3, M is the minimum gray scale value, N is the critical gray scale value, M < i < N and is an integer;

In a possible implementation manner, in the second chromaticity coordinate calculation step, the following formula 2 may be used to calculate the second gray scale value between the minimum gray scale value and the critical gray scale value of the display screen to be adjusted. Chroma coordinates,

Wherein, the above formula 2 can be specifically derived from the following formula 4,

In the above formulas 2 and 4, d _M = y _{M -} x _M , y _M represents the second chromaticity coordinate in the reference chromaticity coordinates of the minimum gray scale value M of the standard display screen;

In a possible implementation manner, the first chromaticity coordinate x in the above formula 1 may also be replaced by y, and the y' _i may be calculated by using the following formula 1 '.

Accordingly, the above formula 1' is derived from the following formula 3',

In one possible implementation, may be in the above formula 2 is replaced with a second chromaticity coordinate y x, the following formula may be used specifically of formula 2 'calculates x' _i,

Wherein, the above formula 2' can be specifically derived from the following formula 4'.

Where d _M =x _M -y _M ,d _i =x _i -y _i ,d _N =x _N -y _N ,d' _M =x' _M -y' _M ,d' _i =x' _i -y ' _i ,d' _N =x' _N -y' _N .

The following is a specific application example of the embodiment, and the specific process is as follows.

1. Select a display screen with optical parameters near the middle value from a batch of liquid crystal displays, and record the display screen as a standard display screen. The liquid crystal display is, for example, a vertical alignment type (English: Vertical Alignment) display, and the gray scale value is 0 to 255, and the optical parameter is, for example, brightness. Then, the standard display screen is chroma-tuned to debug the display screen into a chromaticity curve with good optical parameters and no obvious taste problem observed by the human eye. The chromaticity curve is as shown in FIG. 2, and the chromaticity curve is saved. And use it as a reference chromaticity curve. The chromaticity of each gray scale of the standard display is marked as (x _i , y _i ), i = 0, 1, ..., 255.

2. Take out the display to be adjusted, first adjust its brightness to gamma2.2 curve, and make the display to be adjusted in white balance state, then measure its 0 (minimum gray level) order and 255 (maximum gray level). The chromaticity coordinates (x' ₀ , y' ₀ ) and (x' ₂₅₅ , y' ₂₅₅ ) of the order) adjust the chromaticity coordinates of the order of 20 (critical gray scale) to 254 to the same as the order of 255. The chromaticity of the display to be adjusted is marked as (x' _i , y' _i ), i = 0, 1, ..., 255. At this time, (x' ₂₀ , y' ₂₀ ) = (x' ₂₅₅ , y' ₂₅₅ ).

3. Calculate the to-be-adjusted according to the reference chromaticity curve and the chromaticity coordinates (x' ₀ , y' ₀ ) of the 0 gray scale of the display to be adjusted and the chromaticity coordinates of the 20th order (x' ₂₀ , y' ₂₀ ) The chromaticity coordinates of the 1 to 19th order of the display (from the minimum grayscale value to the critical grayscale value, ie, the low grayscale).

First, the first chromaticity coordinates x' _j , j = 1, 2, ..., 19 are calculated.

The standard display and the display to be adjusted meet the following formula 5,

Finishing the following formula 6,

Thereby, the first chromaticity coordinates of all the low gray levels of the display screen to be adjusted can be obtained.

Next, the second chromaticity coordinates y' _j , j = 1, 2, ..., 19 are calculated.

It should be noted that y (second chromaticity coordinates) cannot be adjusted by a method similar to x (first chromaticity coordinates), because the color expression is affected by both x and y values, if x is adjusted separately , y, regardless of its interaction, will result in the color of its combination being inconsistent under different gray levels. Therefore, in this example, when adjusting y, the difference between x and y of the standard display screen is used as a standard to adjust the y of the display to be adjusted.

Specifically, let d ₀ = y _{0 -} x ₀ , d _j = y _{j -} x _j , d ₂₀ = y _{20 -} x ₂₀ , d' ₀ = y' _{0 -} x' ₀ , d' _j = y' _j -x' _j d' ₂₀ =y' ₂₀ -x' ₂₀ , j=1,2,...,19.

Correspondingly, the standard display and the display to be adjusted satisfy the following formula 7,

Finished the following formula 8,

Then y' _j =x' _j +d _j ', that is, y' _j is obtained.

Thereby, the second chromaticity coordinates of all the low gray levels of the display screen to be adjusted can be obtained.

4. Adjust the chromaticity of the display according to the chromaticity coordinates of the 0 to 255 gray scale obtained in the above process.

Specifically, the voltage applied to the liquid crystal cell corresponding to each RGB sub-pixel on the liquid crystal display is adjusted according to the chromaticity coordinates of the gray scale of 0 to 255, thereby adjusting the chromaticity of the display screen. Figure 3 shows the chromaticity curve comparison of the standard display and the display after chroma debugging. Figure 4 shows the color of the low-gray portion of the standard display and the display after chroma debugging. A comparison chart of the degree curve.

Thus, according to the chromaticity adjustment method in the present example, the display screen can be automatically and accurately chromatically adjusted to debug the display screen to have good optical parameters and no obvious taste problems are observed by the human eye.

It should be noted that although the chromaticity adjustment method of the present invention is described by taking a grayscale value of 0 to 255 as an example, those skilled in the art can understand that the present invention is not limited thereto. In fact, it can be flexibly changed according to the setting of the grayscale value in the actual display.

Example 3

FIG. 5 is a block diagram showing the structure of a chromaticity adjusting device of a liquid crystal display according to an embodiment of the present invention. As shown in FIG. 5, the chromaticity adjusting device 50 of the liquid crystal display may mainly include: a measuring module 51, a setting module 52, a chromaticity coordinate calculating module 53, and a chromaticity adjusting module 54. The measurement module 51 is mainly used to measure the chromaticity coordinates of the display screen to be adjusted at the minimum grayscale value and the maximum grayscale value; the setting module 52 can be connected to the measurement module 51, and is mainly used to set the threshold of the display to be adjusted. The chromaticity coordinates of the grayscale value are set to the chromaticity coordinates of the maximum grayscale value; the chromaticity coordinate calculation module 53 can be respectively connected to the measurement module 51 and the setting module 52, and is mainly used for the minimum according to the to-be-adjusted display screen. Calculating the chromaticity value of the grayscale value and the critical grayscale value, and the reference chromaticity coordinate between the minimum grayscale value and the critical grayscale value of the standard display screen, respectively calculating the minimum grayscale value of the display to be adjusted a chromaticity coordinate of each grayscale value between the critical grayscale values; the chromaticity adjustment module 54 may be coupled to the chromaticity coordinate calculation module 53 for mainly selecting a minimum grayscale value to a critical grayscale according to the to-be-adjusted display screen The chromaticity coordinates of the gray scale values between the values are used to adjust the chromaticity of the display to be adjusted.

In a possible implementation manner, the chromaticity coordinate calculation module 53 may mainly include a first chromaticity coordinate calculation module 531 and a second chromaticity coordinate calculation module 532. The first chromaticity coordinate calculation module 531 is mainly used for color according to the first chromaticity coordinate in the reference chromaticity coordinate of the standard display screen, the minimum grayscale value of the to-be-adjusted display screen, and the critical grayscale value. a first chromaticity coordinate in the coordinate coordinate to calculate a first chromaticity coordinate of each grayscale value between the minimum grayscale value and the critical grayscale value of the to-be-adjusted display screen; the second chromaticity coordinate calculation module 532 The first chromaticity coordinate calculation module 531 may be connected to the first chromaticity coordinate calculation module 531, and configured to be used according to the first chromaticity coordinate of each grayscale value between the minimum grayscale value and the critical grayscale value of the display screen to be adjusted. a first chromaticity coordinate and a second chromaticity coordinate in a reference chromaticity coordinate of the standard display screen, to calculate a second grayscale value between the minimum grayscale value and the critical grayscale value of the to-be-adjusted display screen Chroma coordinates.

The above-described chromaticity adjusting device of the present embodiment can be used to perform the chromaticity adjusting method of the above-mentioned Embodiment 1, and the specific flow of the chromaticity adjusting method is described in detail in the above Embodiment 1.

In a possible implementation manner, the first chromaticity coordinate calculation module 531 can calculate, by using Equation 1 below, a first grayscale value between the minimum grayscale value and the critical grayscale value of the to-be-adjusted display screen. Chroma coordinates,

x' _M denotes a first chromaticity coordinate in the chromaticity coordinate of the minimum grayscale value M of the display to be adjusted, and x' _i denotes a minimum grayscale value M to a critical grayscale value of the display to be adjusted The first chromaticity coordinate in the chromaticity coordinates of each gray scale value i between N, x' _N represents the first chromaticity coordinate in the chromaticity coordinates of the critical gray scale value N of the display screen to be adjusted.

In a possible implementation manner, the second chromaticity coordinate calculation module 532 may calculate, by using Equation 2 below, a second gray scale value between the minimum gray scale value and the critical gray scale value of the to-be-adjusted display screen. Chroma coordinates,

In a possible implementation manner, the color adjustment device further includes a selection module 55. The selection module 55 can be connected to the chromaticity coordinate calculation module 53 for selecting a liquid crystal display having an optical parameter at an intermediate value from a plurality of liquid crystal displays as the standard display screen.

The above-described chromaticity adjusting device of the present embodiment can be used to perform the chromaticity adjusting method of the above-mentioned Embodiment 2, and the specific flow of the chromaticity adjusting method is described in detail in the above Embodiment 2.

According to the chromaticity adjusting device of the liquid crystal display provided by the embodiment, the chromaticity coordinates of the low gray scales of the other display screens to be adjusted can be calculated by using the chromaticity coordinates of the low gray scales as the standard display screen, thereby The chromaticity of the display screen is adjusted based on the calculated chromaticity coordinates of each low gray level to obtain a display screen with good optical parameters and no obvious taste problems observed by the human eye. According to the chromaticity adjusting device of the present embodiment, the chromaticity of the display screen can be automatically and accurately adjusted by the instrument, so that the chromaticity debugging efficiency of the display screen can be greatly improved.

Example 4

Fig. 6 is a block diagram showing the structure of a chromaticity adjusting device for a liquid crystal display panel according to another embodiment of the present invention. The chromaticity adjusting device 1100 of the liquid crystal display panel may be a host server having a computing capability, a personal computer PC, or a portable computer or terminal that can be carried. The specific embodiments of the present invention do not limit the specific implementation of the computing node.

The chromaticity adjusting device 1100 of the liquid crystal display includes a processor 1110, a communication interface 1120, a memory 1130, and a bus 1140. The processor 1110, the communication interface 1120, and the memory 1130 complete communication with each other through the bus 1140.

Communication interface 1120 is for communicating with network devices, including, for example, a virtual machine management center, shared storage, and the like.

The processor 1110 is configured to execute a program. The processor 1110 may be a central processing unit CPU, or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.

The memory 1130 is used to store files. The memory 1130 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory. Memory 1130 can also be a memory array. The memory 1130 may also be partitioned, and the blocks may be combined into a virtual volume according to certain rules.

In a possible implementation manner, the foregoing program may be a program generation including a computer operation instruction. code. The program can be specifically used to implement the operations of the steps in Embodiment 1, Embodiment 2.

Those of ordinary skill in the art will appreciate that the various exemplary elements and algorithm steps in the embodiments described herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can select different methods for implementing the described functions for a particular application, but such implementation should not be considered to be beyond the scope of the present invention.

If the function is implemented in the form of computer software and sold or used as a stand-alone product, it is considered to some extent that all or part of the technical solution of the present invention (for example, a part contributing to the prior art) is It is embodied in the form of computer software products. The computer software product is typically stored in a computer readable non-volatile storage medium, including instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform all of the methods of various embodiments of the present invention. Or part of the steps. The foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

A method for adjusting a chromaticity of a liquid crystal display, comprising:

Measuring chromaticity coordinates of the display screen to be adjusted at a minimum grayscale value and a maximum grayscale value;

Setting a chromaticity coordinate of a critical grayscale value of the display screen to be adjusted to a chromaticity coordinate of the maximum grayscale value;

Calculating the to-be-determined according to the minimum gray scale value of the to-be-adjusted display screen and the chroma coordinate of the critical gray scale value, and the reference chroma coordinate between the minimum gray scale value and the critical gray scale value of the standard display screen Adjusting the chromaticity coordinates of each grayscale value between the minimum grayscale value and the critical grayscale value of the display screen;

Adjusting the chromaticity of the to-be-adjusted display screen according to the chromaticity coordinates of the grayscale values between the minimum grayscale value and the critical grayscale value of the to-be-adjusted display screen.
The method according to claim 1, wherein the chromaticity coordinates of the minimum grayscale value and the critical grayscale value of the display screen to be adjusted, and the minimum grayscale value to the critical grayscale value of the standard display screen are Calculating the chromaticity coordinates of each grayscale value between the minimum grayscale value and the critical grayscale value of the to-be-adjusted display screen, respectively, according to the reference chromaticity coordinates, including:

a first chromaticity coordinate calculation step, configured to be used according to a first chromaticity coordinate in a reference chromaticity coordinate of the standard display screen, a minimum grayscale value of the to-be-adjusted display screen, and a chromaticity coordinate of a critical grayscale value a first chromaticity coordinate to calculate a first chromaticity coordinate of each grayscale value between the minimum grayscale value and the critical grayscale value of the to-be-adjusted display screen;

a second chromaticity coordinate calculation step, configured to determine, according to the first chromaticity coordinate of each grayscale value between the minimum grayscale value and the critical grayscale value of the display screen to be adjusted, the reference chromaticity of the standard display screen a first chromaticity coordinate and a second chromaticity coordinate in the coordinate to calculate a second chromaticity coordinate of each grayscale value between the minimum grayscale value and the critical grayscale value of the to-be-adjusted display screen.
The method according to claim 2, wherein in the first chromaticity coordinate calculating step, the following formula 1 is used to calculate each of the to-be-adjusted display screens from a minimum grayscale value to a critical grayscale value. The first chromaticity coordinate of the grayscale value,

Where M is the minimum grayscale value, N is the critical grayscale value, M<i<N and is an integer;

x M represents the first chromaticity coordinate in the reference chromaticity coordinate of the minimum gray scale value M of the standard display screen, and x i represents the minimum gray scale value M to the critical gray scale value N of the standard display screen a first chromaticity coordinate in reference chromaticity coordinates of each grayscale value i, x N representing a first chromaticity coordinate in a reference chromaticity coordinate of a critical grayscale value N of the standard display screen;

x' M denotes a first chromaticity coordinate in the chromaticity coordinate of the minimum grayscale value M of the display to be adjusted, and x' i denotes a minimum grayscale value M to a critical grayscale value of the display to be adjusted The first chromaticity coordinate in the chromaticity coordinates of each gray scale value i between N, x' N represents the first chromaticity coordinate in the chromaticity coordinates of the critical grayscale value N of the display screen to be adjusted.
The method according to claim 3, wherein in the second chromaticity coordinate calculating step, the following formula 2 is used to calculate each of the to-be-adjusted display screens from a minimum grayscale value to a critical grayscale value. The second chromaticity coordinate of the grayscale value,

Where d M = y M - x M , y M represents the second chromaticity coordinate in the reference chromaticity coordinates of the minimum gray scale value M of the standard display screen;

d i = y i - x i , y i represents the second chromaticity coordinate in the reference chromaticity coordinates of each gray scale value i between the minimum gray scale value M and the critical gray scale value N of the standard display screen ;

d N = y N - x N , y N represents the second chromaticity coordinate in the reference chromaticity coordinate of the critical gray scale value N of the standard display screen;

D' M = y ' M - x ' M , y ' M represents the second chromaticity coordinate in the chromaticity coordinates of the minimum gray scale value M of the display screen to be adjusted;

d i '=y i '-x i ', y' i represents the second of the chromaticity coordinates of the gray scale values i between the minimum gray scale value M and the critical gray scale value N of the display screen to be adjusted Chromaticity coordinates;

d' N = y ' N - x ' N , y ' N represents the second chromaticity coordinate in the chromaticity coordinates of the critical gray scale value N of the display screen to be adjusted.
The method according to any one of claims 1 to 4, further comprising:

A liquid crystal display whose optical parameter is at an intermediate value is selected from a plurality of liquid crystal displays as the standard display screen.
A chromaticity adjusting device for a liquid crystal display, comprising:

a measuring module, configured to measure chromaticity coordinates of the display screen to be adjusted at a minimum grayscale value and a maximum grayscale value;

a setting module, configured to be connected to the measuring module, configured to set a chromaticity coordinate of a critical grayscale value of the to-be-adjusted display screen to a chromaticity coordinate of the maximum grayscale value;

a chromaticity coordinate calculation module respectively connected to the measurement module and the setting module, configured to select a chromaticity coordinate according to a minimum grayscale value and a critical grayscale value of the display screen to be adjusted, and a minimum from a standard display screen a reference chromaticity coordinate between the grayscale value and the critical grayscale value, respectively calculating chromaticity coordinates of each grayscale value between the minimum grayscale value and the critical grayscale value of the to-be-adjusted display screen;

a chromaticity adjustment module, coupled to the chromaticity coordinate calculation module, configured to adjust the chromaticity coordinates of each grayscale value between a minimum grayscale value and a critical grayscale value according to the to-be-adjusted display screen The color of the display to be adjusted.
The apparatus according to claim 6, wherein the chromaticity coordinate calculation module comprises:

a first chromaticity coordinate calculation module, configured to use, according to the first chromaticity coordinate in the reference chromaticity coordinate of the standard display screen, the minimum grayscale value of the to-be-adjusted display screen, and the chromaticity coordinate of the critical grayscale value a first chromaticity coordinate to calculate a first chromaticity coordinate of each grayscale value between the minimum grayscale value and the critical grayscale value of the to-be-adjusted display screen;

a second chromaticity coordinate calculation module, coupled to the first chromaticity coordinate calculation module, configured to perform, according to the first color of each grayscale value between a minimum grayscale value and a critical grayscale value of the display screen to be adjusted Degree coordinates, first chromaticity coordinates and second chromaticity coordinates in reference chromaticity coordinates of the standard display screen, to calculate respective grays between the minimum gray scale value and the critical gray scale value of the to-be-adjusted display screen The second chromaticity coordinate of the order value.
The apparatus according to claim 7, wherein the first chromaticity coordinate calculation module calculates the gray scales between the minimum grayscale value and the critical grayscale value of the to-be-adjusted display screen by using Equation 1 below. The first chromaticity coordinate of the value,

Where M is the minimum grayscale value, N is the critical grayscale value, M<i<N and is an integer;

x M represents the first chromaticity coordinate in the reference chromaticity coordinate of the minimum gray scale value M of the standard display screen, and x i represents the minimum gray scale value M to the critical gray scale value N of the standard display screen a first chromaticity coordinate in reference chromaticity coordinates of each grayscale value i, x N representing a first chromaticity coordinate in a reference chromaticity coordinate of a critical grayscale value N of the standard display screen;

x' M denotes a first chromaticity coordinate in the chromaticity coordinate of the minimum grayscale value M of the display to be adjusted, and x' i denotes a minimum grayscale value M to a critical grayscale value of the display to be adjusted The first chromaticity coordinate in the chromaticity coordinates of each gray scale value i between N, x' N represents the first chromaticity coordinate in the chromaticity coordinates of the critical grayscale value N of the display screen to be adjusted.
The apparatus according to claim 8, wherein the second chromaticity coordinate calculation module calculates the gray scales between the minimum gray scale value and the critical gray scale value of the to-be-adjusted display screen by using Equation 2 below; The second chromaticity coordinate of the value,

Where d M = y M - x M , y M represents the second chromaticity coordinate in the reference chromaticity coordinates of the minimum gray scale value M of the standard display screen;

d i = y i - x i , y i represents the second chromaticity coordinate in the reference chromaticity coordinates of each gray scale value i between the minimum gray scale value M and the critical gray scale value N of the standard display screen ;

d N = y N - x N , y N represents the second chromaticity coordinate in the reference chromaticity coordinate of the critical gray scale value N of the standard display screen;

D' M = y ' M - x ' M , y ' M represents the second chromaticity coordinate in the chromaticity coordinates of the minimum gray scale value M of the display screen to be adjusted;

d i '=y i '-x i ', y' i represents the second of the chromaticity coordinates of the gray scale values i between the minimum gray scale value M and the critical gray scale value N of the display screen to be adjusted Chromaticity coordinates;

d' N = y ' N - x ' N , y ' N represents the second chromaticity coordinate in the chromaticity coordinates of the critical gray scale value N of the display screen to be adjusted.
The apparatus according to any one of claims 6 to 9, further comprising:

And a selection module, coupled to the chromaticity coordinate calculation module, for selecting a liquid crystal display having an optical parameter at an intermediate value from the plurality of liquid crystal displays as the standard display screen.