WO2021190158A1

WO2021190158A1 - Adjusting apparatus, method for adjusting gamma voltage and white balance of display screen, and medium

Info

Publication number: WO2021190158A1
Application number: PCT/CN2021/074929
Authority: WO
Inventors: 张耀; 张滨; 徐大鹏
Original assignee: 深圳精智达技术股份有限公司
Priority date: 2020-03-26
Filing date: 2021-02-02
Publication date: 2021-09-30
Also published as: CN111243550A; CN111243550B

Abstract

A method for adjusting the gamma voltage and white balance of a display screen, comprising: an adjusting apparatus determines a target binding point in a display lookup table of a gamma voltage corresponding to a display screen, and obtains an initial register value corresponding to the target binding point and a target spectral tristimulus value; determines a predicted value corresponding to the initial register value, and adjusts the initial register value according to the predicted value to obtain a first register value; when it is determined according to the first register value and the target spectral tristimulus value that the first register value satisfies a convergence condition, saves the first register value as a register value after the adjustment of the target binding point is completed; and re-determines the target binding point from among binding points in the display lookup table that are not subjected to register value adjustment, and returns to the step of obtaining the initial register value corresponding to the target binding and the target spectral tristimulus value. Also disclosed are an adjusting apparatus and a medium.

Description

Adjusting device, method and medium for adjusting gamma voltage and white balance of display screen

Priority information

This application claims the priority of the Chinese patent application filed on March 26, 2020 with the application number 202010227482.X, the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the technical field of display screens, and in particular to an adjusting device, a method and medium for adjusting the gamma voltage and white balance of the display screen.

Background technique

In the display production process, gamma voltage and white balance correction are a very critical process, which can ensure that the display has a good visual perception. Currently, the commonly used gamma voltage adjustment methods include linear interpolation and coefficient matrix method. The accuracy of these two methods is very different in the high gray scale interval and the low gray scale interval, which results in very low gamma voltage adjustment efficiency.

Summary of the invention

The main purpose of this application is to provide an adjusting device, a method and medium for adjusting the gamma voltage and white balance of the display screen, aiming to solve the problem of low gamma voltage adjustment efficiency.

To achieve the above objective, the present application provides a method for adjusting the gamma voltage and white balance of a display screen, wherein the method for adjusting the gamma voltage and white balance of the display screen includes the following steps:

The adjusting device determines the target binding point in the display look-up table of the gamma voltage corresponding to the display screen, and obtains the initial register value and the target spectral tristimulus value corresponding to the target binding point, and the preset gray scale in the display look-up table The gray level of the value is a binding point, and the number of the binding point is less than the number of gray levels, and the register value includes a red register value, a green register value, and a blue register value;

Determining a predicted value corresponding to the initial register value, and adjusting the initial register value according to the predicted value to obtain a first register value;

When it is determined according to the first register value and the target spectral tristimulus value that the first register value satisfies the convergence condition, saving the first register value as the register value adjusted for the target binding point;

Re-determine the target binding point among the binding points in the display look-up table for which no register value adjustment has been performed, and return to execute the step of obtaining the initial register value corresponding to the target binding and the target spectral tristimulus value, wherein , The adjusting device sequentially adjusts the register value of each binding point in the display look-up table according to the gray scale value of the binding point in descending order.

In an embodiment, after the step of adjusting the initial register value according to the predicted value to obtain the first register value, the method further includes:

When it is determined according to the first register value and the target spectral tristimulus value that the first register value does not meet the convergence condition, acquiring the actual spectral tristimulus value corresponding to the first register value;

Determining an adjustment value of the first register value according to the actual spectral tristimulus value and the target spectral tristimulus value, and adjusting the first register value according to the adjustment value to obtain a second register value;

When it is determined according to the second register value and the target spectral tristimulus value that the second register value satisfies the convergence condition, the second register value is saved as the register value adjusted for the target binding point, and executed The step of re-determining the target binding point among the binding points in the display look-up table for which no register value adjustment has been performed.

In an embodiment, after the step of adjusting the first register value according to the adjustment value to obtain the second register value, the method further includes:

When it is determined according to the second register value and the target spectrum tristimulus value that the second register value does not meet the convergence condition, the second register value is updated to the first register value, and the execution of the acquisition is returned. The steps of the actual spectral tristimulus value corresponding to the first register value are described.

In an embodiment, the step of determining the predicted value corresponding to the initial register value includes:

When the adjustment sequence number of the target binding point is greater than or equal to the preset sequence number, and the prediction value corresponding to the first binding point that completes the register value adjustment is determined according to the empirical value, obtain the prediction corresponding to the last binding point that completes the register value adjustment Value and the third register value;

The empirical value corresponding to the initial register value is obtained, and the empirical value is corrected according to the difference between the predicted value corresponding to the last binding point and the third register value to obtain the predicted value corresponding to the initial register value.

When the adjustment sequence number of the target binding point is greater than or equal to the preset sequence number, and the predicted value corresponding to the first binding point that completes the register value adjustment is determined according to the prediction formula, obtain the adjustment of the register value before the target binding point The fourth register value corresponding to the binding point, wherein the adjustment sequence number of the binding point corresponding to each of the fourth register values is adjacent to the adjustment sequence number of the target binding point in sequence;

The predicted value corresponding to the initial register value is determined according to each of the fourth register values.

When the adjustment sequence number of the target binding point is less than the preset sequence number, and the initial register value contains a corresponding empirical value, the empirical value is determined as the predicted value corresponding to the initial register value.

When the adjustment sequence number of the target binding point is less than the preset sequence number, and the initial register value does not contain the corresponding empirical value, obtain the voltage, the maximum value of the gamma voltage, and the minimum value of the gamma voltage of the display module in the display screen. Prediction formula

Determine the predicted value corresponding to the initial register value according to the voltage, the maximum value of the gamma voltage, the minimum value of the gamma voltage, the target spectral tristimulus value, and the prediction formula.

Collecting four screens of red, green, blue, and white displayed on the display screen, where the screens are the screens displayed on the display screen under the maximum register value;

Acquiring the spectral tristimulus value corresponding to each pixel in the picture, and determining the conversion matrix and the offset according to the spectral tristimulus value;

Obtaining a preset formula, and determining a prediction formula according to the conversion matrix, the offset, and the preset formula;

Save the prediction formula.

In one embodiment, after each register value is adjusted, the reference value is determined according to the actual spectral tristimulus value corresponding to the adjusted register value, the adjusted register value, and the target spectral tristimulus, and the reference value is determined in the When the reference value is less than the preset value, the initial register value corresponding to the target binding point is updated with the adjusted register value, and the target is re-determined among the binding points in the display look-up table for which no register value adjustment has been performed. Steps to tie points.

In an embodiment, after the step of determining the reference value according to the actual spectral tristimulus value corresponding to the adjusted register value, the adjusted register value, and the target spectral tristimulus, the method further includes:

When the reference parameter is greater than or equal to a preset value, judging whether the adjusted register value meets the convergence condition according to the adjusted register value and the target spectral tristimulus value;

When the adjusted register value satisfies the convergence condition, the initial register value corresponding to the target binding point is updated with the adjusted register value, and each binding in the display look-up table that has not undergone register value adjustment is executed. Steps to re-determine the target binding point in the point;

When the adjusted register value does not meet the convergence condition, the adjusted register value update is continuously adjusted to return the actual spectral tristimulus value corresponding to the adjusted register value and the adjusted register Value and the step of determining the reference value of the target spectrum tristimulus.

In an embodiment, after the steps of the method for adjusting gamma voltage and white balance, the method further includes:

After all the binding points in the display look-up table have finished updating the register value, each of the binding points and the adjusted register value of each binding point are written into the display screen.

After all the binding points in the display look-up table have updated their register values, save the adjusted register values of each of the binding points as the empirical value corresponding to the binding points in the look-up table displayed on the target display screen. The type of the target display screen is the same as the type of the display screen.

To achieve the above objective, the present application also provides an adjustment device, the display screen includes a memory, a processor, and an adjustment program that is stored in the memory and can be run on the processor, and the adjustment program is controlled by the When the processor executes, each step of the method for adjusting the gamma voltage and white balance of the display screen as described above is realized.

In order to achieve the above objective, the present application also provides a medium storing an adjustment program, which when executed by a processor, implements the steps of the method for adjusting the gamma voltage and white balance of the display screen as described above. .

The adjustment device, the method and medium for adjusting the gamma voltage and white balance of the display screen proposed in the embodiment of the application, the adjustment device determines the target binding point in the display look-up table of the gamma voltage corresponding to the display screen, and obtains the target binding point correspondence The initial register value and the target spectrum tristimulus value, the adjustment device then determines the predicted value corresponding to the initial register value, and adjusts the initial register value according to the predicted value to obtain the first register value, which is based on the first register value and the target spectrum tristimulus value When the value determines that the first register value satisfies the convergence condition, the first register value is saved as the register value after the adjustment of the target binding point, and the target binding point is re-determined among the binding points for which the register value adjustment is not performed, thereby according to the binding point Adjust the register value of each binding point in order of the gray scale value from large to small. Since the adjustment of the register value in the display look-up table of the gamma voltage can be regarded as the adjustment of the gamma voltage, and the adjustment of the register value of the three channels of red, green and blue can be regarded as adjustment of the white balance of the display at the same time. The binding point is a gray scale with a preset gray scale value and the number of binding points is less than the number of gray scales, so that the adjustment device does not need to adjust the register value for each gray scale, thereby shortening the gamma voltage and whiteness in the display screen. The adjustment duration of the balance improves the efficiency of the adjustment of the gamma voltage and the white balance.

Description of the drawings

FIG. 1 is a schematic diagram of the hardware structure of the adjusting device involved in the solution of the embodiment of the present application;

2 is a schematic flowchart of a first embodiment of a method for adjusting the gamma voltage and white balance of the display screen of the present application;

3 is a schematic flowchart of a second embodiment of a method for adjusting gamma voltage and white balance of a display screen according to the present application;

4 is a schematic diagram of a detailed flow chart of determining the predicted value corresponding to the initial register value in step S30 in the third embodiment of the method for adjusting the gamma voltage and white balance of the display screen of the present application;

5 is a schematic diagram of a detailed flow chart of determining the predicted value corresponding to the initial register value in step S30 in the fourth embodiment of the method for adjusting the gamma voltage and white balance of the display screen of the present application;

6 is a schematic diagram of a detailed flow chart of determining the predicted value corresponding to the initial register value in step S30 in the fifth embodiment of the method for adjusting the gamma voltage and white balance of the display screen of the present application;

FIG. 7 is a detailed flowchart of determining the predicted value corresponding to the initial register value in step S30 in the sixth embodiment of the method for adjusting the gamma voltage and white balance of the display screen of the present application.

The realization, functional characteristics, and advantages of the purpose of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

It should be understood that the specific embodiments described here are only used to explain the present application, and are not used to limit the present application.

The main solution of the embodiment of the application is: the adjustment device determines the target binding point in the display look-up table of the gamma voltage corresponding to the display screen, and obtains the initial register value and the target spectral tristimulus value corresponding to the target binding point. The gray scale of the preset gray scale value in the display look-up table is the binding point, and the number of binding points is less than the number of gray scales, the register value includes the red register value, the green register value, and the blue register value; determine all The predicted value corresponding to the initial register value, and the initial register value is adjusted according to the predicted value to obtain the first register value; the first register value is determined according to the first register value and the target spectral tristimulus value When the convergence condition is met, the first register value is saved as the register value after the target binding point adjustment is completed; the target binding point is re-determined among the binding points in the display look-up table for which no register value adjustment has been performed, and Return to the step of obtaining the initial register value corresponding to the target binding and the target spectral tristimulus value, wherein the adjusting device performs the display look-up table in the descending order of the gray scale value of the binding point Each binding point of, adjusts the register value in turn.

Since the adjustment of the register value in the display look-up table of the gamma voltage can be regarded as the adjustment of the gamma voltage, and the adjustment of the register value of the three channels of red, green and blue can be regarded as adjustment of the white balance of the display at the same time. The binding point is a gray scale with a preset gray scale value and the number of binding points is less than the number of gray scales, so that the adjustment device does not need to adjust the register value for each gray scale, thereby shortening the gamma voltage and whiteness in the display screen. The adjustment duration of the balance improves the efficiency of the adjustment of the gamma voltage and the white balance.

As shown in Fig. 1, Fig. 1 is a schematic diagram of the hardware structure of the adjustment device involved in the solution of the embodiment of the present application.

As shown in FIG. 1, the solution of the embodiment of the present application relates to a regulating device. The regulating device may include a processor 1001, such as a CPU, a communication bus 1002, and a memory 1003. Among them, the communication bus 1002 is used to implement connection and communication between these components. The memory 1003 may be a high-speed RAM memory, or a non-volatile memory (non-volatile memory), such as a magnetic disk memory. Optionally, the memory 1003 may also be a storage device independent of the aforementioned processor 1001.

Those skilled in the art can understand that the structure shown in FIG. 1 does not constitute a limitation on the adjustment device, and may include more or less components than shown in the figure, or a combination of certain components, or different component arrangements.

As shown in FIG. 1, the memory 1003, which is a computer storage medium, may include an operating system and an adjustment program.

In the device shown in FIG. 1, the processor 1001 may be used to call the adjustment program stored in the memory 1003 and perform the following operations:

In an embodiment, the processor 1001 may call an adjustment program stored in the memory 1003, and also perform the following operations:

Save the prediction formula.

After each adjustment of the register value, the reference value is determined according to the actual spectral tristimulus value corresponding to the adjusted register value, the adjusted register value, and the target spectral tristimulus, and when the reference value is less than the preset value At this time, the initial register value corresponding to the target binding point is updated with the adjusted register value, and the step of re-determining the target binding point among the binding points in the display look-up table for which no register value adjustment has been performed is performed.

After all the binding points in the display look-up table finish updating the register value, each of the binding points and the adjusted register value of each binding point are written into the display screen.

Based on the above hardware construction, various embodiments of the method for adjusting the gamma voltage and white balance of the display screen of the present application are proposed.

2, the first embodiment of the present application provides a method for adjusting the gamma voltage and white balance of a display screen. The adjustment of the gamma voltage and white balance of the display screen includes the following steps:

Step S10, the adjusting device determines the target binding point in the display look-up table of the gamma voltage corresponding to the display screen, the gray scale of the preset gray scale value in the display look-up table is the binding point, and the number of the binding points is small Regarding the number of gray levels, the register value includes the red register value, the green register value and the blue register value;

In this embodiment, the execution body is an adjustment device, and the adjustment device may be a computer or a signal generator. The adjustment device and the display screen to be adjusted can exchange data in a wired or wireless manner. When adjusting the gamma voltage and white balance of the display screen, the adjusting device obtains the display look-up table of the gamma voltage corresponding to the display screen. The display look-up table can be stored in the adjusting device, and the adjusting device determines the type of the display screen to obtain the display look-up table corresponding to the display screen. Of course, the display look-up table can also be stored in the display screen, and the adjusting device obtains the display look-up table by sending an acquisition instruction to the display screen.

The display look-up table contains 256 gray levels, and each gray level corresponds to a register value. In this embodiment, the register value corresponding to each gray level in the display look-up table is defined as an initial register value. The register value includes the register values of the three channels of R (red), G (green) and B (blue), that is, the initial register value includes the red register value Rreg, the green register value Greg, and the blue register value Breg. Rreg, Greg, and Breg are used to control the driving voltage and current of the display screen. Therefore, adjusting the initial register value is to correct the gamma voltage. In addition, in this embodiment, the adjustment device adjusts Rreg, Greg, and Breg at the same time, thereby limiting the color coordinates of the gray scale. Therefore, the adjustment device adjusts the white balance while adjusting the three independent display channels of RGB. Adjustment.

In this embodiment, the adjusting device does not adjust the register value of each gray scale, but selects a set of gray scales to correct the brightness and color coordinates, and the adjusted gray scale is defined as a binding point. It can be understood that the gray scale of the preset gray scale value displayed in the look-up table is the binding point, and the number of binding points is less than the number of gray scales.

The adjusting device adjusts the register value of each binding point in sequence according to the gray scale value of the binding point from large to small. The adjusting device first determines the target binding point in each difficult point in the display look-up table of the gamma voltage corresponding to the display screen.

Step S20, obtaining the initial register value corresponding to the target binding point and the target spectral tristimulus value;

After determining the target binding point, the adjusting device determines the initial register value corresponding to the target binding point in the display look-up table. It should be noted that each gray level in the display look-up table corresponds to a spectral tristimulus value, which is the spectral tristimulus value measured on the target screen that needs to be reached after the gray level is adjusted. In the embodiment, it is defined as the tristimulus value of the target spectrum. Spectral tristimulus values can be represented by XYZ, Rreg corresponds to X, Greg corresponds to Y, and Breg corresponds to Z. The adjustment device will determine the target spectral tristimulus value corresponding to the target binding point.

Step S30: Determine the predicted value corresponding to the initial register value, and adjust the initial register value according to the predicted value to obtain the first register value;

The adjusting device determines the predicted value corresponding to the initial register value, and the predicted value refers to the adjusted value of the initial register value. The predicted value may be an empirical value, and the empirical value refers to the register value corresponding to the target binding point in the display screen after the gamma voltage and white balance have been adjusted. The adjusting device adjusts the initial register value through the predicted value to obtain the first register value. The predicted value is also divided into the predicted value corresponding to RGB. Therefore, the first register value is the adjusted register value of Rreg, Greg, and Breg.

Step S40, when it is determined according to the first register value and the target spectral tristimulus value that the first register value satisfies the convergence condition, the first register value is saved as the register value of the target binding point adjusted ；

Due to the difference in display technology, the experience value may not be able to accurately adjust the gamma voltage and white balance of the current display. In this regard, after adjusting the initial register value, the adjusting device needs to determine whether the adjusted first register value meets the convergence condition.

The convergence conditions include the conditions corresponding to Rreg, Greg, and Breg. Only when Rreg, Greg, and Breg all meet the corresponding conditions, can it be determined that the first register meets the convergence condition. The adjusting device needs to determine whether the first register value meets the convergence condition according to the target tristimulus value and the first register value.

Specifically, the convergence condition can be expressed as:

Among them, E _Lv , E _x , E _y are the required values of brightness and color coordinate accuracy that meet the requirements of γ (gamma voltage) and white balance (E _Lv is the required value of brightness accuracy, E _x , E _y are the required value of color coordinate accuracy ), set by the user during use. Lv is the brightness, Lv* is the target brightness, x* and y* are two of the target spectral tristimulus values; x, y are the actual spectral tristimulus values corresponding to the first register value, and abs represents the absolute value. Rreg, Greg, and Breg are all first register values.

The adjustment device is connected with the color analyzer. After obtaining the first register value, the adjustment device writes the first register into the display screen, so that the display screen displays the picture with the first register value. The adjustment device collects the picture by the color analyzer. The actual spectral tristimulus value corresponding to the first register value.

When the first register value meets the convergence condition, the adjustment of the register value of the target binding point is completed, and the first register value of the adjusting device is saved as the register value after the adjustment of the target binding point, that is, the initial register value corresponding to the target binding point Change to the first register value, and save the target binding point in association with the first register value.

Step S50, judging whether each binding point in the display look-up table has completed the adjustment of the register value;

In this embodiment, the adjusting device adjusts the initial register value of the binding point according to steps S10-S40. Therefore, after completing the adjustment of the register value of the target binding point, it is necessary to determine whether the adjustment of the register value of all the binding points is completed. If it is not completed, the adjusting device executes step S60, and if it is completed, it ends the adjustment of the white balance and gamma voltage of the display screen.

In step S60, the target binding point is re-determined among the binding points in the display look-up table for which no register value adjustment has been performed. Each binding point in the lookup table adjusts the register value in turn.

When the adjustment device has not completed the register adjustment of all the binding points, the adjustment device needs to re-determine the target binding point among the binding points in the display look-up table for which no register value adjustment has been performed. Since the adjusting device adjusts the register value of each binding point in order of the gray scale value of the binding point, the newly determined target binding point is the next binding point of the target binding point that has just been adjusted. The adjusting device returns to step S20 again to adjust the register value of the newly determined target binding point. In addition, after all the binding points have finished adjusting the register values, the register values of all the binding points in the display look-up table are updated. Each adjustment device is written into the display screen. The processor in the display screen will perform an interpolation operation on the register value of the non-binding point according to the updated register value of the binding point, thereby updating the entire display look-up table. All the adjusted binding points of the adjusting device and the corresponding register values of the binding points are sent to the display screen, and a programming instruction is sent to the display screen. The display screen writes the binding points and the corresponding register values of the binding points into the display look-up table, and Solidify the written binding point and the register value corresponding to the binding point according to the programming instruction. The processor in the display screen will perform an interpolation operation on the register value of the non-binding point according to the updated register value of the binding point, thereby updating the entire display look-up table. It should be noted that after each adjustment of the register value, the adjustment device will send the adjusted register value to the display screen, but will not send a programming command, that is, the display screen will not write the received register value Into the display look-up table and will not be solidified and stored.

In addition, after adjusting the register values of all the binding points of the display screen, the adjusting device saves the register values after the adjustment of each binding point is used as the empirical value corresponding to the binding points in the target display screen. The type of the target display is the same as the type of the display whose white balance and gamma voltage have just been adjusted.

In this embodiment, the display screen may be an OLED (Organic Light-Emitting Diode) display screen, an LCD (Liquid Crystal Display, liquid crystal display) display screen, or other types of display screens.

In the technical solution provided in this embodiment, the adjustment device determines the target binding point in the display look-up table of the gamma voltage corresponding to the display screen, and obtains the initial register value corresponding to the target binding point and the target spectral tristimulus value, and then adjusts the device. Determine the predicted value corresponding to the initial register value, and adjust the initial register value according to the predicted value to obtain the first register value. When it is determined that the first register value satisfies the convergence condition according to the first register value and the target spectral tristimulus value, the first register value The register value is saved as the register value after the adjustment of the target binding point, and the target binding point is re-determined in each binding point that has not been adjusted by register value, so that each binding point is sequentially adjusted according to the gray scale value of the binding point. Click to adjust the register value. Since the adjustment of the register value in the display look-up table of the gamma voltage can be regarded as the adjustment of the gamma voltage, and the adjustment of the register value of the three channels of red, green and blue can be regarded as adjustment of the white balance of the display at the same time. The binding point is a gray scale with a preset gray scale value and the number of binding points is less than the number of gray scales, so that the adjustment device does not need to adjust the register value for each gray scale, thereby shortening the gamma voltage and whiteness in the display screen. The adjustment duration of the balance improves the efficiency of the adjustment of the gamma voltage and the white balance.

Referring to FIG. 3, FIG. 3 is a second embodiment of the method for adjusting the gamma voltage and white balance of the display screen of the present application. Based on the first embodiment, after the step S30, the method further includes:

Step S70, when it is determined according to the first register value and the target spectral tristimulus value that the first register value does not meet the convergence condition, obtain the actual spectral tristimulus value corresponding to the first register value;

In this embodiment, if the value of the first register does not meet the convergence condition, the adjustment device needs to adjust the first register again. The adjusting device first obtains the actual spectral tristimulus value corresponding to the first register value. The method of obtaining the actual spectral tristimulus values refers to the above description, and will not be repeated here.

Step S80, determining an adjustment value of the first register value according to the actual spectral tristimulus value and the target spectral tristimulus value, and adjusting the first register value according to the adjustment value to obtain a second register value;

In this embodiment, the adjusting device uses the golden gradient ratio descent algorithm to adjust and adjust the first register value, and the golden gradient ratio descent algorithm can be characterized by the following formula:

Among them, X*Y*Z* is the tristimulus value of the tied point target X Y Z, X _i Y _i Z _i is the measured value of the i-th adjustment, and α is 0.382, which is (1-0.618), which is called the golden ratio. △R _i is the adjustment value corresponding to the red register value, △G _i is the adjustment value corresponding to the green register value, and △B _i is the adjustment value corresponding to the blue register value.

The adjusting device takes the initial register value, the first register value, the actual spectral tristimulus value, and the target spectral tristimulus value into the above formula to obtain the adjustment value corresponding to the first register value. The adjusting device then adjusts the first register value according to the adjusted value to obtain the second register value.

Step S90, judging whether the second register value satisfies the convergence condition according to the second register value and the target spectrum tristimulus value;

After determining the second register value, the adjusting device determines whether the second register value meets the convergence condition according to the second register value and the target spectrum tristimulus value. For the specific judgment method, refer to the description of whether the first register value meets the convergence condition. Do not repeat it.

Step S100, when it is determined according to the second register value and the target spectrum tristimulus value that the second register value satisfies the convergence condition, the second register value is saved as the register value after the target binding point adjustment is completed , And re-determine the target binding point among the binding points in the display look-up table for which no register value adjustment has been performed;

When the second register value meets the convergence condition, that is, the adjustment of the register value of the target binding point is completed, the adjusting device saves the second register value as the register value after the adjustment of the target binding point, and executes each of the results in the display look-up table. The target binding point is re-determined among the binding points for adjusting the register value to return to step S20, that is, to adjust the register value of the next binding point. Of course, if all the binding points have completed the adjustment of the register value, it ends.

Step S110: When it is determined that the second register value does not meet the convergence condition according to the second register value and the target spectrum tristimulus value, the second register value is updated to the first register value, and the execution is returned. The step of obtaining the actual spectral tristimulus value corresponding to the first register value is described.

When the second register value does not meet the convergence condition, the second register value is updated to the first register value, thereby returning the actual spectral tristimulus value corresponding to the execution of the first register value, so as to perform the updated first register value again Adjust, that is, adjust the register value after the target binding point is adjusted.

In this embodiment, after the initial adjustment of the register value does not meet the convergence condition, the golden gradient ratio algorithm is used to adjust the adjusted register value again, without the need to pass the golden color conversion between CIE-XYZ and CIE-RGB. Compared with the gradient descent algorithm, it can achieve rapid convergence of the algorithm, and further improve the white balance of the display screen and the adjustment efficiency of the gamma voltage.

4, FIG. 4 is a third embodiment of the method for adjusting the white balance of the gamma voltage of the display screen of the present application. Based on the first or second embodiment, the predicted value corresponding to the initial register value is determined in the step S30 include:

Step S31, when the adjustment sequence number of the target binding point is greater than or equal to the preset sequence number, and the predicted value corresponding to the first binding point that completes the register value adjustment is determined according to the empirical value, obtain the last binding point that completes the register value adjustment The corresponding predicted value and the third register value;

Step S32, obtaining the empirical value corresponding to the initial register value, and correcting the empirical value according to the difference between the predicted value corresponding to the last binding point and the third register value to obtain the empirical value corresponding to the initial register value Predictive value.

In this embodiment, the adjustment device has two cases of empirical value and no empirical value to determine the predicted value of the initial register value, and at the same time, different methods are used to determine the empirical value for the target binding points of different adjustment numbers. In this regard, the adjustment device first determines the adjustment sequence number of the target binding point. If the adjustment sequence number is greater than the preset sequence number, the adjustment device can use the predicted value of the previously completed register value adjustment to determine the predicted value of the target binding point.

Specifically, when the adjustment sequence number is greater than the preset sequence number, it means that the target binding point is not the first binding point to adjust the register value, and the adjusting device determines the predicted value of the first binding point that completes the register value adjustment. The predicted value is determined based on the empirical value, and the adjustment device obtains the predicted value corresponding to the last binding point where the adjustment of the register value is completed and the third register value. The adjusting device obtains the empirical value corresponding to the initial register value, and corrects the empirical value according to the difference between the predicted value corresponding to the last binding point and the third register value to obtain the predicted value corresponding to the initial register value. This adjustment method of the adjusting device is the empirical value differential prediction method, and the empirical value differential prediction method will be described in detail below.

Hutchison, tie point set _{_{P = {p i | p i}} ∈N *, 0≤p i ≤255}, where i∈ {1,2,3, ..., N} , N is the number of tie points. Each binding point has three RGB register values, which are recorded as shown in the formula:

When there is a set of reliable empirical values that can be used as the initial register value, the algorithm can use the existing empirical values to optimize the existing adjustment process, which is called the empirical value differential prediction method. The operation process of the method is as follows:

A set of empirical value sequence is shown in the formula:

When adjusting a new display screen, use the relative adjustment formula described below to predict the register values of the binding points except for the 255 gray-scale binding point.

Among them, the subscript ex represents the empirical value. The adjusting device can obtain the predicted value corresponding to the register value through the above formula, so as to adjust the register value.

In this embodiment, the preset serial number is 2, that is, other binding points whose gray value corresponding to the adjusting device is smaller than the first target binding point (the highest-order binding point) all adopt the empirical value differential prediction method to perform the first register value of the initial register. One time adjustment.

In the technical solution provided in this embodiment, when the adjustment sequence number of the target binding point is greater than or equal to the preset sequence number, and the predicted value of the binding point of the first completed register value is an empirical value, the empirical value differential prediction method is used to accurately Determine the predicted value of the initial register value.

5, FIG. 5 is a fourth embodiment of the method for adjusting the white balance of the gamma voltage of the display screen of the present application. Based on the first to or second embodiments, the prediction corresponding to the initial register value is determined in the step S30 Values include:

Step S33, when the adjustment sequence number of the target binding point is greater than or equal to the preset sequence number, and the predicted value corresponding to the first binding point that completes the register value adjustment is determined according to the prediction formula, obtain the register that is completed before the target binding point A fourth register value corresponding to the binding point of the value adjustment, wherein the adjustment sequence number of the binding point corresponding to each of the fourth register values is adjacent to the adjustment sequence number of the target binding point in sequence;

Step S34: Determine the predicted value corresponding to the initial register value according to each of the fourth register values.

In this embodiment, the adjustment device can be divided into two situations: empirical value and no empirical value to determine the predicted value of the initial register value. At the same time, different methods are used to determine the empirical value for the target binding points of different adjustment numbers. In this regard, the adjustment device first determines the adjustment sequence number of the target binding point. If the adjustment sequence number is greater than the preset sequence number, the adjustment device can use the predicted value of the previously completed register value adjustment to determine the predicted value of the target binding point.

Specifically, when the adjustment sequence number is greater than the preset sequence number, it means that the target binding point is not the first binding point to adjust the register value, and the adjusting device determines the predicted value of the first binding point that completes the register value adjustment. The predicted value is determined according to the prediction formula; at this time, the adjusting device obtains the fourth register value corresponding to the binding point that completes the adjustment of the register value before the target binding point. The adjustment sequence number of the binding point corresponding to each fourth register value is adjacent to the adjustment sequence number of the target binding point. The adjusting device thus determines the predicted value corresponding to the initial register value according to each fourth register value. This adjustment method of the adjustment device is a linear interpolation prediction method, and the linear interpolation prediction method will be described in detail below.

Use adjacent adjusted binding points for recursive linear interpolation prediction. As shown in the formula:

Among them, i is the current binding point number to be adjusted, and Rreg, Greg, and Breg represent the register values of the red, green, and blue channels. The predictive value set of the register of a single binding point can be obtained as shown in the formula.

It can be understood that the adjustment device uses the first two binding points of the target binding point to determine the predicted value.

In this embodiment, the preset sequence number may be 3, that is, the adjusting device uses a prediction formula to determine the predicted value of the highest order binding point and the second high order binding point, and linear interpolation is used for the third and subsequent binding points The prediction method determines the predicted value corresponding to the initial register value.

It should be noted that, for the convenience of description, the scheme formed by step S33 and step S34 and the scheme formed by step S31 and step 32 in this embodiment are not related, but the two schemes may be different parallel schemes under judgment conditions. Specifically, when the adjustment device determines that the adjustment sequence number of the target binding point is greater than or equal to the preset sequence number, it determines the method of determining the predicted value of the binding point that is the first to complete the register value adjustment, and if the predicted value is determined based on the empirical value, step S31 is executed. And step S32; if the predicted value is determined according to the prediction formula, step S33 and step S34 are executed.

In the technical solution provided by this embodiment, when the adjustment sequence number of the target binding point is greater than or equal to the preset sequence number, and the predicted value of the binding point of the first completed register value is determined according to the prediction formula, the linear interpolation prediction method is used to accurately Determine the predicted value of the initial register value.

Referring to FIG. 6, FIG. 6 is a fifth embodiment of the gamma voltage and white balance adjustment method of the display screen of this application. Based on the first to or second embodiments, the prediction corresponding to the initial register value is determined in step S30 Values include:

Step S35: When the adjustment sequence number of the target binding point is less than the preset sequence number, and the initial register value contains a corresponding empirical value, the empirical value is determined as the predicted value corresponding to the initial register value.

In this embodiment, if the adjustment sequence number of the target binding point is less than the preset sequence number, and the initial register value contains the corresponding experience value, the target binding point is the first binding point for register value adjustment. At this time, the experience value As the predicted value corresponding to the initial register, the initial register value is adjusted.

It should be noted that, for ease of description, the scheme formed by step S35 and the schemes formed by step S31 and step 32 in this embodiment are not related, but the two schemes may be different parallel schemes under judgment conditions. Specifically, the adjustment device first judges whether the target binding point has an empirical value; the target binding point has an empirical value, then determines the preset serial number, and further determines whether the adjustment serial number of the target binding point is greater than or equal to the preset serial number, if the target binding point is determined When the adjustment sequence number of is greater than or equal to the preset sequence number, it can be determined that the first binding point for register adjustment also has an empirical value. At this time, the adjustment device performs step S31 and step S32; if the adjustment sequence number of the target binding point is determined When it is less than the preset serial number, step S35 is executed.

In the technical solution provided by this embodiment, if the adjustment sequence number of the target binding point is less than the preset sequence number, the target binding point is corresponding to an empirical value, and the empirical value is determined as the predicted value corresponding to the initial register value.

Referring to FIG. 7, FIG. 7 is a fifth embodiment of the gamma voltage and white balance adjustment method of the display screen of this application. Based on the first to or second embodiments, the prediction corresponding to the initial register value is determined in step S30 Values include:

Step S36, when the adjustment sequence number of the target binding point is less than the preset sequence number, and the initial register value does not contain the corresponding empirical value, obtain the voltage, the maximum gamma voltage, and the gamma voltage of the display module in the display screen Minimum value and prediction formula;

Step S37: Determine the predicted value corresponding to the initial register value according to the voltage, the maximum value of the gamma voltage, the minimum value of the gamma voltage, the target spectral tristimulus value, and the prediction formula.

In this embodiment, when the adjustment sequence number of the target binding point is less than the preset sequence number, and the initial register value does not contain the corresponding empirical value, the adjustment device needs to determine the predicted value of the target binding point according to the prediction formula.

And the prediction formula can be

The adjustment device needs to measure the conversion torque and offset in advance, and obtain the prediction formula according to the preset formula.

Specifically, during the γ adjustment process of the display screen, each binding point has 3 register values Rreg, Greg, Breg that need to be determined through the adjustment process, and the relationship between Rreg, Greg, Breg and the optical tristimulus value XYZ is not linear. . For this, take the intermediate variable:

Among them, N ∈ {R, G, B} respectively represent the values under different color channels, VDD is the power supply voltage of the display module, Vgmp is the maximum value of γ voltage set in the display IC (Integrated Circuit Chip, integrated circuit), Vgsp It is to display the minimum value of γ voltage set in the IC.

Represents the maximum value of registers that can be set for each channel. The intermediate variables t _R , t _G , t _B and the chromaticity coordinates XYZ can be regarded as a linear relationship, as shown in the following formula:

Among them, A is _{the conversion matrix from t R} , t _G , t _B to XYZ, and b is the offset. Through the four-color calibration method, the conversion matrix A and the offset vector b can be obtained. The calibration method is: use the maximum register value to click the screen under the four screens of red, green, blue, and white and measure the XYZ tristimulus values corresponding to the four screens, and use the measured data to solve the matrix equation to obtain the conversion matrix A and the offset b. The reverse process can be written as:

Therefore, you can rely on this model to obtain the register value of each channel corresponding to the target XYZ value from the target XYZ value of each binding point. The calculation formula is as follows:

It is understandable that the above prediction formula can be expressed as:

Collect the four screens of red, green, blue, and white displayed on the display screen, where the screen is the screen displayed by the display screen under the maximum register value; obtain the spectrum three corresponding to the pixel in each screen Stimulus value, and determine the conversion matrix and the offset according to the spectral tristimulus value; obtain a preset formula, and determine the prediction formula according to the conversion matrix, the offset, and the preset formula. After determining the prediction formula, the adjusting device saves the prediction formula.

The adjustment device obtains the voltage, the maximum gamma voltage, the minimum gamma voltage and the prediction formula of the obtained display module, so as to bring the voltage, the maximum gamma voltage, the minimum gamma voltage, and the target spectrum tristimulus value into the prediction Formula, you can get the predicted value corresponding to the initial register value. The preset serial number is 3, and the adjusting device needs to determine the predicted value of the highest-order binding point and the second-high-order binding point according to the prediction formula.

It should be noted that, for ease of description, the scheme formed by step S36 and step S37 and the scheme formed by step S33 and step 34 in this embodiment are not related, but the two schemes may be different parallel schemes under judgment conditions. Specifically, the adjustment device first judges whether the target binding point has an empirical value; the target binding point does not have an empirical value, then determines the preset serial number, and further determines whether the adjustment serial number of the target binding point is greater than or equal to the preset serial number. When the adjustment sequence number of the point is greater than or equal to the preset sequence number, it can be determined that the predicted value of the first binding point for register adjustment is determined by the prediction formula. At this time, the adjustment device performs step S33 and step S34; if the target binding is determined When the adjustment sequence number of the point is less than the preset sequence number, step S36 and step 37 are executed.

In the technical solution provided in this embodiment, when it is determined that the adjustment sequence number of the target binding point is less than the preset sequence number and the initial register does not contain an empirical value, the predicted value corresponding to the target binding point is accurately determined according to the prediction formula.

In one embodiment, after each adjustment of the register value, the reference value is determined according to the actual spectral tristimulus value corresponding to the adjusted register value, the adjusted register value, and the target spectral tristimulus, and the reference value is less than the preset value. When setting the value, the initial register value corresponding to the target binding point is updated with the adjusted register value, and the step of re-determining the target binding point among the binding points in the display look-up table that has not undergone register value adjustment is performed.

When the reference parameter is greater than or equal to the preset value, judge whether the adjusted register value meets the convergence condition according to the adjusted register value and the target spectrum tristimulus value;

When the adjusted register value meets the convergence condition, the initial register value corresponding to the target binding point is updated in the display look-up table, and the adjusted register value is updated in the display look-up table for each binding point that has not undergone register value adjustment. Steps to determine the target binding point;

When the adjusted register value does not meet the convergence condition, continue to adjust the adjusted register value update to return to the actual spectral tristimulus value corresponding to the adjusted register value, the adjusted register value and the target spectral tristimulus Steps to determine the reference value.

In this embodiment, the adjustment device needs to adjust the register value of the target binding point one or more times, and after each adjustment, if the brightness of the display screen changes, but the register value does not change, it can be determined The register value of the target binding point does not need to be adjusted again. For example, the brightness change is 0.1, but the register value does not change, that is, the register value change amount is 0. If the register value is adjusted again, it will cause a greater error. In this regard, the adjustment device needs to obtain the reference parameter to determine whether the reference parameter is close to the preset value, and if it is close to the preset value, there is no need to adjust the register value.

Specifically, the reference parameter close to the preset parameter can be expressed as:

abs(X(R _reg ,G _reg ,B _reg )-X ^* )<e;

abs(Y(R _reg ,G _reg ,B _reg )-Y ^* )<e;

abs(Z(R _reg ,G _reg ,B _reg )-Z ^* )<e;

e is the required value of the accuracy of the tristimulus value that meets the requirements of γ and white balance, and the value is as follows:

Among them, T*=X*+Y*+Z*, δ ^x and δ ^y respectively represent the allowable error value range of the color coordinate.

In the technical solution provided in this embodiment, the adjusting device obtains the reference parameter after each adjustment of the register value to determine whether the register value needs to be adjusted, so as to introduce a larger error.

The present application also provides an adjustment device. The display screen includes a memory, a processor, and an adjustment program that can be run on the memory and on the processor, and the adjustment program is implemented when the processor is executed. The steps of the method for adjusting the gamma voltage and white balance of the display screen described in the above embodiment.

The present application also provides a medium that stores an adjustment program, and when the adjustment program is executed by a processor, each step of the method for adjusting the gamma voltage and white balance of the display screen as described in the above embodiment is realized.

It should be noted that in this article, the terms "include", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, It also includes other elements that are not explicitly listed, or elements inherent to the process, method, article, or system. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other identical elements in the process, method, article, or system that includes the element.

The serial numbers of the foregoing embodiments of the present application are for description only, and do not represent the superiority or inferiority of the embodiments.

Through the description of the above implementation manners, those skilled in the art can clearly understand that the above-mentioned embodiment method can be implemented by means of software plus the necessary general hardware platform, of course, it can also be implemented by hardware, but in many cases the former is better.的实施方式。 Based on this understanding, the technical solution of this application essentially or the part that contributes to the existing technology can be embodied in the form of a software product, and the computer software product is stored in a storage medium (such as ROM/RAM) as described above. , Magnetic disks, optical disks), including several instructions to make a terminal device (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the method described in each embodiment of the present application.

The above are only the preferred embodiments of the application, and do not limit the scope of the patent for this application. Any equivalent structure or equivalent process transformation made using the content of the description and drawings of the application, or directly or indirectly applied to other related technical fields , The same reason is included in the scope of patent protection of this application.

Claims

A method for adjusting the gamma voltage and white balance of a display screen, wherein the method for adjusting the gamma voltage and white balance of the display screen includes the following steps:

The adjusting device determines the target binding point in the display look-up table of the gamma voltage corresponding to the display screen, and obtains the initial register value and the target spectral tristimulus value corresponding to the target binding point, and the preset gray scale in the display look-up table The gray scale of the value is the binding point, and the number of the binding points is less than the number of gray scales, and the register value includes the initial register value, the green register value, and the blue register value;

Determining a predicted value corresponding to the initial register value, and adjusting the initial register value according to the predicted value to obtain a first register value;

When it is determined according to the first register value and the target spectral tristimulus value that the first register value satisfies the convergence condition, saving the first register value as the register value adjusted for the target binding point;

Re-determine the target binding point among the binding points in the display look-up table for which no register value adjustment has been performed, and return to execute the step of obtaining the initial register value corresponding to the target binding and the target spectral tristimulus value, wherein , The adjusting device sequentially adjusts the register value of each binding point in the display look-up table according to the gray scale value of the binding point in descending order.
The method for adjusting the gamma voltage and white balance of a display screen according to claim 1, wherein after the step of adjusting the initial register value according to the predicted value to obtain the first register value, the method further comprises:

When it is determined according to the first register value and the target spectral tristimulus value that the first register value does not meet the convergence condition, acquiring the actual spectral tristimulus value corresponding to the first register value;

Determining an adjustment value of the first register value according to the actual spectral tristimulus value and the target spectral tristimulus value, and adjusting the first register value according to the adjustment value to obtain a second register value;

When it is determined according to the second register value and the target spectral tristimulus value that the second register value satisfies the convergence condition, the second register value is saved as the register value adjusted for the target binding point, and executed The step of re-determining the target binding point among the binding points in the display look-up table for which no register value adjustment has been performed.
3. The method for adjusting gamma voltage and white balance of a display screen according to claim 2, wherein after the step of adjusting the first register value according to the adjustment value to obtain the second register value, the method further comprises:

When it is determined according to the second register value and the target spectrum tristimulus value that the second register value does not meet the convergence condition, the second register value is updated to the first register value, and the execution of the acquisition is returned. The steps of the actual spectral tristimulus value corresponding to the first register value are described.
The method for adjusting the gamma voltage and white balance of the display screen according to claim 1, wherein the step of determining the predicted value corresponding to the initial register value comprises:

When the adjustment sequence number of the target binding point is greater than or equal to the preset sequence number, and the prediction value corresponding to the first binding point that completes the register value adjustment is determined according to the empirical value, obtain the prediction corresponding to the last binding point that completes the register value adjustment Value and the third register value;

The empirical value corresponding to the initial register value is obtained, and the empirical value is corrected according to the difference between the predicted value corresponding to the last binding point and the third register value to obtain the predicted value corresponding to the initial register value.
The method for adjusting the gamma voltage and white balance of the display screen according to claim 1, wherein the step of determining the predicted value corresponding to the initial register value comprises:

When the adjustment sequence number of the target binding point is greater than or equal to the preset sequence number, and the predicted value corresponding to the first binding point that completes the register value adjustment is determined according to the prediction formula, obtain the adjustment of the register value before the target binding point The fourth register value corresponding to the binding point, wherein the adjustment sequence number of the binding point corresponding to each of the fourth register values is adjacent to the adjustment sequence number of the target binding point in sequence;

The predicted value corresponding to the initial register value is determined according to each of the fourth register values.
The method for adjusting the gamma voltage and white balance of the display screen according to claim 1, wherein the step of determining the predicted value corresponding to the initial register value comprises:

When the adjustment sequence number of the target binding point is less than the preset sequence number, and the initial register value contains a corresponding empirical value, the empirical value is determined as the predicted value corresponding to the initial register value.
The method for adjusting the gamma voltage and white balance of the display screen according to claim 1, wherein the step of determining the predicted value corresponding to the initial register value comprises:

When the adjustment sequence number of the target binding point is less than the preset sequence number, and the initial register value does not contain the corresponding empirical value, obtain the voltage, the maximum value of the gamma voltage, and the minimum value of the gamma voltage of the display module in the display screen. Prediction formula

Determine the predicted value corresponding to the initial register value according to the voltage, the maximum value of the gamma voltage, the minimum value of the gamma voltage, the target spectral tristimulus value, and the prediction formula.
7. The method for adjusting the gamma voltage and white balance of the display screen according to claim 7, wherein before the step of determining the target binding point in the display look-up table of the gamma voltage corresponding to the display screen by the adjusting device, the method further comprises:

Collecting four screens of red, green, blue, and white displayed on the display screen, where the screens are the screens displayed on the display screen under the maximum register value;

Acquiring the spectral tristimulus value corresponding to each pixel in the picture, and determining the conversion matrix and the offset according to the spectral tristimulus value;

Obtaining a preset formula, and determining a prediction formula according to the conversion matrix, the offset, and the preset formula;

Save the prediction formula.
The method for adjusting the gamma voltage and white balance of the display screen according to any one of claims 1-8, wherein, after each adjustment of the register value, according to the actual spectral tristimulus value corresponding to the adjusted register value , The adjusted register value and the target spectral tristimulus determine the reference value, and when the reference value is less than the preset value, the initial register value corresponding to the target binding point is updated with the adjusted register value, and the The step of re-determining the target binding point among the binding points in the display look-up table for which no register value adjustment has been performed.
The method for adjusting the gamma voltage and white balance of the display screen according to claim 9, wherein the actual spectral tristimulus value corresponding to the adjusted register value, the adjusted register value, and the target spectral tristimulus After the steps of determining the reference value, it also includes:

When the reference parameter is greater than or equal to a preset value, judging whether the adjusted register value meets the convergence condition according to the adjusted register value and the target spectral tristimulus value;

When the adjusted register value satisfies the convergence condition, the initial register value corresponding to the target binding point is updated with the adjusted register value, and each binding in the display look-up table that has not undergone register value adjustment is executed. Steps to re-determine the target binding point in the point;

When the adjusted register value does not meet the convergence condition, the adjusted register value update is continuously adjusted to return the actual spectral tristimulus value corresponding to the adjusted register value and the adjusted register Value and the step of determining the reference value of the target spectrum tristimulus.
8. The method for adjusting gamma voltage and white balance according to any one of claims 1-8, wherein after the steps of the method for adjusting gamma voltage and white balance, the method further comprises:

After all the binding points in the display look-up table finish updating the register value, each of the binding points and the adjusted register value of each binding point are written into the display screen.
8. The method for adjusting gamma voltage and white balance according to any one of claims 1-8, wherein after the steps of the method for adjusting gamma voltage and white balance, the method further comprises:

After all the binding points in the display look-up table have updated their register values, save the adjusted register values of each of the binding points as the empirical value corresponding to the binding points in the look-up table displayed on the target display screen. The type of the target display screen is the same as the type of the display screen.
An adjustment device, wherein the display screen includes a memory, a processor, and an adjustment program running in the memory and on the processor, and the adjustment program is executed by the processor to achieve Each step of the method for adjusting the gamma voltage and white balance of the display screen described in any one of 1-12 is required.
A medium, wherein the medium stores an adjustment program, and when the adjustment program is executed by a processor, each of the methods for adjusting the gamma voltage and white balance of the display screen according to any one of claims 1-12 is realized step.