Uniformity correction method for a display device

Abstract

The present application relates to a method for correcting the uniformity of a display device, which includes obtaining the chromaticity uniformity information of the display panel and the luminance uniformity information of the light source module of the display device when a solid color pattern is displayed on the display panel of the display device and the luminance of the light source module of the display device is full brightness. Then, the display device is subjected to a first correction according to the chromaticity uniformity information and the luminance uniformity information, and a color difference value is obtained. If the color difference value is less than a preset value, the correction parameters of the display device are determined according to the display device after the first correction. If the color difference value is greater than or equal to the preset value, an adjustment factor is obtained based on the corrected display panel to perform a second correction on the display device, and the correction parameters of the display device are determined according to the display device after the second correction.

Description

Technical Field

[0001] This application relates to the technical field of display devices, and particularly to a method for correcting the uniformity of a display device. Background Art

[0002] Display devices have become indispensable devices in life, such as LCD monitors and head-up displays (HUDs). A display device generally includes a display panel and a light source module. The display panel may be an LCD panel, and the light source module may be a direct-lit or edge-lit type. Figure 1 A schematic diagram showing a cross-sectional view of a conventional display device 10 is presented, where the display device 10 includes a display panel 12 and a light source module 14. Figure 2a Shows Figure 1 A schematic diagram of a top view of the display panel 12 in Figure 2b Shows Figure 1 A schematic diagram of a top view of the light source module 14 in. The display panel 12 is used to determine the image to be displayed. The light source module 14 is a direct-lit backlight panel and is disposed on the back or below the display panel 12. The light source module 14 emits light to the display panel 12 to determine the brightness of the displayed image. The light source module 14 can be divided into multiple regions 142 (as shown in Figure 2b ), and each region 142 includes multiple light-emitting diodes (LEDs). The light source module 14 can control the duty cycle and / or current of the multiple LEDs in each region 142 to determine the brightness of each region 142. The brightness of the multiple regions 142 can be adjusted individually, so the brightness provided by the multiple regions 142 can be different.

[0003] However, the display panel 12 and the light source module 14 each include multiple components, and the parameters of these components are basically not completely consistent, which results in chromaticity and / or brightness non-uniformity of the display device. For example, when the display panel 12 displays a solid color pattern (such as a full-red, full-blue, or full-green image), the chromaticity of some regions 122 and 124 may deviate, as shown in Figure 2a , resulting in non-uniform chromaticity of the image displayed on the display panel 12. Similarly, when the light source module 14 adjusts the brightness of all regions 142 to be the same, the brightness of some regions 1422 and 1424 may be higher or lower than that of other regions.

[0004] Currently, the method to improve the non-uniformity phenomenon is to use the matching method. The matching method is to first measure multiple display panels 12 and multiple light source modules 14, and then select appropriate display panels 12 and light source modules 14 according to the measurement results to form the display device 10. After the matching is completed, a Just-noticeable difference (JND) filter is needed to detect whether the uniformity of the display device 10 meets the regulations. However, such a matching method is difficult to effectively improve the non-uniformity phenomenon, and if the display device 10 after the matching does not meet the requirements of uniformity, the display device 10 will be discarded, resulting in an increase in the overall manufacturing cost. Summary of the Invention

[0005] The purpose of this application is to propose a method for correcting the uniformity of a display device.

[0006] The method for correcting the uniformity of the display device of this application includes: obtaining the chromaticity uniformity information of the display panel and the brightness uniformity information of the light source module in a state where the display panel of the display device displays a solid color pattern and the brightness of the light source module of the display device is fully bright;

[0007] Generating a first adjustment factor according to the chromaticity uniformity information, wherein the first adjustment factor is used to correct the gamma parameter of the display panel;

[0008] Generating a second adjustment factor according to the brightness uniformity information, wherein the second adjustment factor is used to correct the brightness of the light source module;

[0009] Performing a first correction on the display device according to the first adjustment factor and the second adjustment factor, and obtaining the color difference value of the display device after the first correction, wherein the first adjustment factor and the second adjustment factor are respectively used to correct the display panel and the light source module;

[0010] If the color difference value is less than a preset value, determining the correction parameters of the display device according to the display device after the first correction; and

[0011] If the color difference value is greater than or equal to the preset value, obtaining a third adjustment factor according to the display panel corrected by the first adjustment factor to perform a second correction on the display device, and determining the correction parameters of the display device according to the display device after the second correction, wherein the third adjustment factor is a parameter used to correct the pixel information of the display panel.

[0012] In an embodiment, the step of obtaining the chromaticity uniformity information includes:

[0013] Obtain the chromaticity distribution information of the entire display panel; and

[0014] Use a first algorithm to calculate the chromaticity uniformity information according to the chromaticity distribution information.

[0015] In one embodiment, the step of obtaining the third adjustment factor includes:[[]]

[0016] Divide the display panel into multiple regions;

[0017] Use a second algorithm to calculate multiple correction values of the multiple regions according to the pixel values of all sub-pixels in each region, where each region corresponds to one correction value; and

[0018] Determine the third adjustment factor according to the multiple correction values.

[0019] In one embodiment, the step of obtaining the brightness uniformity information includes:[[]]

[0020] Obtain the brightness distribution information of the entire light source module; and

[0021] Use an algorithm to calculate the brightness uniformity information according to the brightness distribution information.

[0022] In one embodiment, the step of obtaining the brightness uniformity information includes:[[]]

[0023] Divide the light source module into multiple regions;

[0024] Obtain the multiple brightness distribution information of the multiple regions, where each region corresponds to one brightness distribution information; and

[0025] Use an algorithm to calculate the brightness uniformity information according to the multiple brightness distribution information.

[0026] In one embodiment, the brightness of the multiple regions can be controlled individually.

[0027] In one embodiment, the step of obtaining the chromaticity uniformity information includes:[[]]

[0028] Divide the display panel into multiple first regions;

[0029] Obtain the multiple chromaticity distribution information of the multiple first regions, where each first region corresponds to one chromaticity distribution information; and

[0030] Use a first algorithm to calculate the chromaticity uniformity information according to the multiple chromaticity distribution information.

[0031] In one embodiment, the step of obtaining the luminance uniformity information includes:

[0032] Dividing the light source module into a plurality of second regions;

[0033] Obtaining a plurality of luminance distribution information of the plurality of second regions, wherein each of the second regions corresponds to one of the luminance distribution information; and

[0034] Calculating the luminance uniformity information from the plurality of luminance distribution information by using a second algorithm.

[0035] In one embodiment, the area of each of the first regions is equal to the area of each of the second regions.

[0036] In one embodiment, the step of obtaining the third adjustment factor includes:

[0037] Dividing the display panel into a plurality of second regions, wherein the area of each of the second regions is smaller than the area of each of the first regions;

[0038] Calculating a plurality of correction values of the plurality of second regions by using a second algorithm based on the pixel values of all sub-pixels in each of the second regions, wherein each of the second regions corresponds to one of the correction values; and

[0039] Determining the third adjustment factor according to the plurality of correction values.

[0040] The uniformity correction method of the display device of the present application can effectively improve the non-uniformity phenomenon of the display device, and the uniformity correction method of the present application can correct the uniformity of the assembled display device to meet the specifications, thereby reducing the overall manufacturing cost. Description of the Drawings

[0041] Figure 1 Schematic diagram of a cross-sectional view of a conventional display device.

[0042] Figure 2a For Figure 1 Schematic diagram of a top view of the display panel in

[0043] Figure 2b For Figure 1 Schematic diagram of a top view of the light source module in

[0044] Figure 3 Schematic diagram of a flowchart of the uniformity correction method of the display device in an embodiment of the present application.

[0045] Figure 4a For the present application to illustrate Figure 3 The display panel in the first embodiment of steps S10 and S22 in

[0046] Figure 4b This application is used to illustrate Figure 3 the light source module in the first embodiment of steps S10 and S22.

[0047] Figure 5a This application is used to illustrate Figure 3 the display panel in the second embodiment of steps S10 and S22.

[0048] Figure 5b This application is used to illustrate Figure 3 the light source module in the second embodiment of steps S10 and S22.

[0049] Figure 6a This application is used to illustrate Figure 3 the display panel in the third embodiment of steps S10 and S22.

[0050] Figure 6b This application is used to illustrate Figure 3 the light source module in the third embodiment of steps S10 and S22.

[0051] Figure 7a This application is used to illustrate Figure 3 the display panel in the fourth embodiment of step S10.

[0052] Figure 7b This application is used to illustrate Figure 3 the display panel in the fourth embodiment of step S22.

[0053] Figure 7c This application is used to illustrate Figure 3 the light source module in the fourth embodiment of steps S10 and S22.

[0054] Explanation of the reference numerals in the drawings:

[0055] 10. Display device 12. Display panel

[0056] 122. Region 124. Region

[0057] 126. Region 128. Region

[0058] 14. Light source module 142. Region

[0059] 1422. Region 144. Region Detailed implementation manners

[0060] Figure 3 The figure shows a schematic diagram of a flowchart of a uniformity correction method for a display device in an embodiment of this application. As Figure 1As shown, the traditional display device 10 includes a display panel 12 and a light source module 14. The display device 10 of the present application may be, but is not limited to, an LCD monitor or a head-up display. The display panel 12 may be, but is not limited to, an LCD panel. The light source module 14 may be a direct-lit type or a side-lit type. In Figure 3 In step S10, the display device 10 controls the display panel 12 to display a solid color pattern and controls the brightness of the light source module 14 to be full brightness. In this state, a detection device (not shown in the figure) obtains the chromaticity uniformity information of the display panel 12 and the brightness uniformity information of the light source module 14. The solid color pattern may be, but is not limited to, an all-red, all-blue, or all-green image. In some embodiments, the detection device includes a camera (not shown in the figure). The camera is used to obtain the image displayed by the display device 10, and the detection device then obtains or calculates the chromaticity uniformity information of the display panel 12 and the brightness uniformity information of the light source module 14 based on the image.

[0061] After obtaining the chromaticity uniformity information and the brightness uniformity information of the light source module 14, step S12 is performed. In step S12, the detection device generates a first adjustment factor X1 according to the chromaticity uniformity information. After obtaining the first adjustment factor X1, step S14 is performed. In step S14, the detection device generates a second adjustment factor Y1 according to the brightness uniformity information. In Figure 3 In the embodiments of , the uniformity correction method of the present application is to first perform step S12 to obtain the first adjustment factor X1, and then perform step S14 to obtain the second adjustment factor Y1. However, the present application is not limited thereto. The uniformity correction method of the present application may also first perform step S14 to obtain the second adjustment factor Y1, and then perform step S12 to obtain the first adjustment factor X1, or perform steps S12 and S14 simultaneously to obtain the first adjustment factor X1 and the second adjustment factor Y1.

[0062] After obtaining the first adjustment factor X1 and the second adjustment factor Y1, step S16 is performed. In step S16, the display device 10 performs the first correction based on the first adjustment factor X1 and the second adjustment factor Y1. Specifically, the display device 10 corrects the gamma parameter of the display panel 12 according to the first adjustment factor X1, and the second adjustment factor Y1 is used to correct the brightness of the light source module 14. After the display device 10 completes the first correction, the detection device detects the display device 10 again to obtain the color difference ΔE of the display device 10 after the first correction.

[0063] After obtaining the color difference value ΔE, step S18 is performed. In step S18, the detection device determines whether the color difference value ΔE is less than a preset value. When the detection device determines that the color difference value ΔE is less than the preset value, it means that the uniformity of the display device 10 after the first calibration meets the requirements. Therefore, step S20 is performed. In step S20, the calibration parameters of the display device 10 are determined based on the display device 10 after the first calibration, and the calibration parameters are stored in the display device 10. Specifically, step S20 determines the calibration parameters according to the chromaticity distribution of the display panel 12 and the brightness distribution of the light source module 14 after the first calibration. In some embodiments, the calibration parameter may be a look-up table. According to the image data to be displayed, the display device 10 selects an appropriate adjustment factor based on the look-up table. In some embodiments, an algorithm may be used to calculate the calibration parameter based on the first adjustment factor X1 and the second adjustment factor Y1. In some embodiments, the first adjustment factor X1 and the second adjustment factor Y1 may be used as the calibration parameter.

[0064] In step S18, when the detection device determines that the color difference value ΔE is greater than or equal to the preset value, it means that the uniformity of the display device 10 after the first calibration does not meet the requirements. Therefore, step S22 is performed. In step S22, the detection device performs a second calibration on the display device 10 by obtaining a third adjustment factor Z1 based on the display panel 12 calibrated by the first adjustment factor X1, where the third adjustment factor Z1 is a parameter for calibrating the pixel information of the display panel 12. In some embodiments, the detection device may use an algorithm to obtain the third adjustment factor Z1 based on the image displayed on the display panel 12.

[0065] After the display device 10 performs the second calibration, step S24 is performed. In step S24, the detection device determines the calibration parameters of the display device 10 based on the display device 10 after the second calibration, and the calibration parameters are stored in the display device 10. Specifically, step S24 determines the calibration parameters according to the chromaticity distribution of the display panel 12 and the brightness distribution of the light source module 14 after the second calibration. In some embodiments, the calibration parameter may be a look-up table. According to the image data to be displayed, the display device 10 selects an appropriate adjustment factor based on the look-up table. In some embodiments, an algorithm may be used to calculate the calibration parameter based on the first adjustment factor X1, the second adjustment factor Y1, and the third adjustment factor Z1. In some embodiments, the first adjustment factor X1, the second adjustment factor Y1, and the third adjustment factor Z1 may be used as the calibration parameter.

[0066] Figure 4a shows an embodiment of the present application for illustrating Figure 3 the display panel in the first embodiment of steps S10 and S22;Figure 4b shows the light source module in the first embodiment for explaining Figure 3 steps S10 and S22 in the present application. Figure 3 Step S10 of Figure 3 includes obtaining the chromaticity distribution information of the entire display panel 12 and the luminance distribution information of the entire light source module 14, and then respectively calculating the chromaticity uniformity information and the luminance uniformity information according to the chromaticity distribution information and the luminance distribution information through the first algorithm and the second algorithm. In

[0067] Figure 5a shows the display panel in the second embodiment for explaining Figure 3 steps S10 and S22 in the present application; Figure 5b shows the display panel in the second embodiment for explaining Figure 3 steps S10 and S22 in the present application. In Figure 5a and Figure 5b the light source module 14 is divided into multiple regions 142, and the luminance of the multiple regions 142 can be controlled individually. Figure 3 Step S10 of Figure 3 includes obtaining the chromaticity distribution information of the entire display panel 12 and the multiple luminance distribution information of the multiple regions 142 of the light source module 14, where each region 142 corresponds to a luminance distribution information, and then respectively calculating the chromaticity uniformity information and the luminance uniformity information according to the chromaticity distribution information and the multiple luminance distribution information through the first algorithm and the second algorithm. In

[0068] Figure 6a shows the display panel in the third embodiment for explaining Figure 3 steps S10 and S22 in the present application; Figure 6b shows the light source module in the third embodiment for explaining Figure 3 steps S10 and S22 in the present application. In Figure 6a and Figure 6bIn this case, the display panel 12 is divided into multiple regions 126, and the light source module 14 is divided into multiple regions 142, and the brightness of the multiple regions 142 can be controlled individually. Figure 3 Step S10 of includes obtaining multiple chromaticity distribution information of the multiple regions 126 and multiple brightness distribution information of the multiple regions 142. Among them, each region 126 corresponds to one chromaticity distribution information, and each region 142 corresponds to one brightness distribution information. Then, the chromaticity uniformity information and the brightness uniformity information are respectively calculated according to the multiple chromaticity distribution information and the multiple brightness distribution information through the first algorithm and the second algorithm. In Figure 3 In step S22 of, the detection device includes using a third algorithm to calculate multiple correction values of the multiple regions 126 based on the pixel values of all sub-pixels in each region 126. Among them, each region 126 corresponds to one correction value. Then, according to the multiple correction values, the third adjustment factor Z1 is determined. The first algorithm, the second algorithm, and the third algorithm used in this application are common algorithms, so the calculation process thereof will not be specifically described. In Figure 6a and Figure 6b In the embodiments of and, the area of the region 126 is equal to the area of the region 142. However, this application is not limited thereto, and the area of the region 126 may also be smaller than or larger than the area of the region 142.

[0069] Figure 7a shows the display panel in the fourth embodiment for explaining step S10 in this application; Figure 3 In Figure 7b shows the display panel in the fourth embodiment for explaining step S22 in this application; Figure 3 In Figure 7c shows the light source module in the fourth embodiment for explaining steps S10 and S22 in this application. In Figure 3 In, Figure 7a , Figure 7b and Figure 7c In, the display panel 12 is divided into multiple regions 126 in step S10 and into multiple regions 128 in step S22. The light source module 14 is divided into multiple regions 142, and the brightness of the multiple regions 142 can be controlled individually. Among them, the area of the region 126 is larger than the area of the region 128. Figure 3 Step S10 of includes obtaining multiple chromaticity distribution information of the multiple regions 126 and multiple brightness distribution information of the multiple regions 142. Among them, each region 126 corresponds to one chromaticity distribution information, and each region 142 corresponds to one brightness distribution information. Then, the chromaticity uniformity information and the brightness uniformity information are respectively calculated according to the multiple chromaticity distribution information and the multiple brightness distribution information through the first algorithm and the second algorithm. In Figure 3In step S22, the detection device calculates a plurality of correction values for the plurality of regions 128 by using a third algorithm based on the pixel values of all sub-pixels in each region 128. Among them, each region 128 corresponds to a correction value. Then, based on the plurality of correction values, the third adjustment factor Z1 is determined. The first algorithm, the second algorithm, and the third algorithm used in this application are common algorithms, so the calculation process thereof will not be specifically described herein. In Figure 7a and Figure 7c In the embodiment of, the area of the region 126 is equal to the area of the region 142. However, this application is not limited thereto. The area of the region 126 may also be smaller than or larger than the area of the region 142.

[0070] In Figure 3 In the uniformity correction method of, the correction is completed after step S22. However, this application is not limited thereto. In some embodiments, after step S22 ends, the color difference value of the display device 10 after the second correction can be obtained. When the color difference value is still greater than or equal to the preset value, the region of the display panel 12 can be further refined for further correction. Taking Figure 7b as an example, after step S22 ends, if the color difference value is still greater than or equal to the preset value, the display panel 12 is divided into a plurality of small regions, and the area of each small region is smaller than the area of the region 128. Then, based on the pixel values of all sub-pixels in each small region, a plurality of correction values for the plurality of small regions are calculated, and then the third adjustment factor Z2 is determined. If the color difference value after being corrected by the third adjustment factor Z2 is still greater than or equal to the preset value, the region of the display panel 12 can be further refined for correction until the color difference value is less than the preset value and the correction operation ends.

[0071] The above description is only an embodiment of the present application and does not impose any form of limitation on the present application. Although the present application has been disclosed as above by way of examples, it is not intended to limit the present application. Any person with ordinary knowledge in the technical field to which the present application pertains, without departing from the scope of the technical solution of the present application, may make some changes or modifications to the above-disclosed technical content to obtain equivalent embodiments with equivalent changes. However, as long as the content does not depart from the technical solution of the present application, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A uniformity correction method for a display device, characterized in that Including: Under the state that the display panel of the display device displays a solid color pattern and the brightness of the light source module of the display device is full brightness, obtaining the chromaticity uniformity information of the display panel and the brightness uniformity information of the light source module; Generating a first adjustment factor according to the chromaticity uniformity information, wherein the first adjustment factor is used to correct the gamma parameter of the display panel; Generating a second adjustment factor according to the brightness uniformity information, wherein the second adjustment factor is used to correct the brightness of the light source module; Performing a first correction on the display device according to the first adjustment factor and the second adjustment factor, and obtaining the color difference value of the display device after the first correction, wherein the first adjustment factor and the second adjustment factor are respectively used to correct the display panel and the light source module; If the color difference value is less than a preset value, determining the correction parameter of the display device according to the display device after the first correction; and If the color difference value is greater than or equal to the preset value, obtaining a third adjustment factor according to the display panel corrected by the first adjustment factor to perform a second correction on the display device, and determining the correction parameter of the display device according to the display device after the second correction, wherein the third adjustment factor is a parameter used to correct the pixel information of the display panel.

2. The uniformity correction method according to claim 1, characterized in that, The step of obtaining the chromaticity uniformity information includes: Obtaining the chromaticity distribution information of the whole display panel; and Calculating the chromaticity uniformity information according to the chromaticity distribution information by using a first algorithm.

3. The uniformity correction method according to claim 2, wherein The step of obtaining the third adjustment factor includes: Dividing the display panel into multiple regions; Calculating multiple correction values of the multiple regions by using a second algorithm according to the pixel values of all sub-pixels in each region, wherein each region corresponds to one correction value; and Determining the third adjustment factor according to the multiple correction values.

4. The uniformity correction method according to claim 1, wherein The step of obtaining the brightness uniformity information includes: Obtaining the brightness distribution information of the whole light source module; and Calculating the brightness uniformity information according to the brightness distribution information by using an algorithm.

5. The uniformity correction method according to claim 1, characterized in that The step of obtaining the brightness uniformity information includes: Dividing the light source module into multiple regions; Obtaining multiple brightness distribution information of the multiple regions, wherein each region corresponds to one brightness distribution information; and Calculating the brightness uniformity information according to the multiple brightness distribution information by using an algorithm.

6. The uniformity correction method according to claim 5, wherein The brightness of the multiple regions can be controlled individually.

7. The uniformity correction method according to claim 1, wherein The step of obtaining the chromaticity uniformity information includes: Dividing the display panel into multiple first regions; Obtaining multiple chromaticity distribution information of the multiple first regions, wherein each first region corresponds to one chromaticity distribution information; and Calculating the chromaticity uniformity information according to the multiple chromaticity distribution information by using a first algorithm.

8. The uniformity correction method according to claim 7, characterized in that The step of obtaining the brightness uniformity information includes: Dividing the light source module into multiple second regions; Obtain a plurality of luminance distribution information of the plurality of second regions, wherein each of the second regions corresponds to one piece of the luminance distribution information; and Calculate the luminance uniformity information according to the plurality of luminance distribution information by using a second algorithm.

9. The uniformity correction method according to claim 8, wherein The area of each of the first regions is equal to the area of each of the second regions.

10. The uniformity correction method according to claim 7, wherein The step of obtaining the third adjustment factor includes: Divide the display panel into a plurality of second regions, wherein the area of each of the second regions is smaller than the area of each of the first regions; Use a second algorithm to calculate a plurality of correction values of the plurality of second regions based on the pixel values of all sub-pixels in each of the second regions, wherein each of the second regions corresponds to one of the correction values; and Determine the third adjustment factor based on the plurality of correction values.

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