TWI888801B - Compensation document generation method and display panel defect detection system - Google Patents

Abstract

The present invention mainly discloses a compensation file generation method, which is executed by a display panel defect detection system to control a display driver chip to drive a display panel to display multiple frames of grayscale images, and then collect the detection data of each frame of grayscale image, and obtain the compensation data of each frame of grayscale image after data conversion and data processing. Afterwards, the compensation data is burned into the display driver chip to use the compensation data to perform pixel compensation on the grayscale image displayed by the display panel, thereby confirming the compensation effect. Continuously, after repeatedly executing the aforementioned detection data acquisition operation, compensation data generation operation, and compensation data chip writing operation multiple times, it is confirmed that the final compensation data has the best pixel compensation effect.

Description

Compensation document generation method and display panel defect detection system

The present invention relates to the technical field of flat panel display devices, and in particular to a method for generating compensation documents used in a display panel defect detection system.

It is known that flat panel displays include non-self-luminous flat panel displays and self-luminous flat panel displays, wherein liquid crystal displays are a type of non-self-luminous flat panel displays that have been used for a long time, while organic light-emitting diode (OLED) displays and light-emitting diode (LED) displays are self-luminous flat panel displays with mainstream applications. FIG1 is a block diagram of a known OLED display device. As shown in FIG1, the known OLED display device 1a mainly includes: an OLED panel 11a and at least one display driver chip 12a, wherein the OLED panel 11a includes X×Y pixel circuits 111a and X×Y OLED elements 112a.

Engineers familiar with the design and manufacture of OLED display devices 1a must know that due to material differences and/or process errors in the production process, some OLED panels 11a will show the so-called Mura phenomenon, where Mura refers to the color deviation caused by uneven brightness of sub-pixels (i.e., OLED elements 112a) within the OLED panel 11a. Therefore, before the OLED display device 1a is shipped, it must receive a measurement from a pixel compensation system to determine the Mura defect of the OLED panel 11a, and then create a corresponding Demura compensation file, and finally burn the Demura compensation file into the display driver chip 12a. Thus, after receiving an input display data transmitted by a host computer 2a, a demura compensation unit 121a inside the display driver chip 12a can perform a compensation operation on the input display data according to the demura compensation file, thereby generating an output display data. Afterwards, the display driver chip 12a drives the OLED panel 11a for display according to the output display data.

The prior art is to operate the pixel compensation system to perform an RGB three-color compensation operation or a white screen single-color compensation operation according to the detection data of the OLED panel 11a to generate a corresponding Demura compensation file. However, practical experience shows that the Demura compensation file generated by the white screen single-color compensation operation cannot completely eliminate the aforementioned color deviation phenomenon. On the other hand, the Demura compensation file generated by the RGB three-color compensation operation can eliminate the color deviation phenomenon of most OLED panels, but the color deviation phenomenon of a small number of OLED panels cannot be effectively eliminated.

From the above description, it can be seen that a new method for generating compensation documents is urgently needed in this field.

The main purpose of the present invention is to provide a compensation file generation method, which is executed by a display panel defect detection system to control a display driver chip to drive a display panel to display multiple frames of grayscale images, then collect the detection data of each frame of grayscale image, and obtain the compensation data of each frame of grayscale image after data conversion and data processing. Afterwards, the compensation data is burned into the display driver chip to use the compensation data to perform pixel compensation on the grayscale image displayed by the display panel, thereby confirming the compensation effect. Continuing, after repeatedly executing the aforementioned detection data acquisition operation, compensation data generation operation, and compensation data chip writing operation multiple times, it is confirmed that the final compensation data has the best pixel compensation effect.

The compensation document generation method of the present invention can be executed by an LCD panel defect detection system, an OLED panel defect detection system, an LED panel defect detection system, a Micro-LED panel defect detection system, or a QLED panel defect detection system, thereby generating a corresponding compensation document to be burned into an LCD display driver chip, an OLED display driver chip, an LED display driver chip, a Micro-LED display driver chip, or a QLED display driver chip.

To achieve the above-mentioned object, the present invention proposes an embodiment of the compensation file generation method, which is executed by a display panel defect detection system and includes the following steps: driving a display panel to display a plurality of grayscale images, then collecting a plurality of detection red grayscale data of a plurality of pixels of each grayscale image, a plurality of detection green grayscale data of a plurality of pixels of each grayscale image, Grayscale data and a plurality of detected blue grayscale data; in each frame of grayscale image, the detected red grayscale data, the detected green grayscale data and the detected blue grayscale data of the pixel located at the center point are set as a target red grayscale data, a target green grayscale data and a target blue grayscale data; in each frame of grayscale image, Calculate a red grayscale difference, a green grayscale difference and a blue grayscale difference between the detected red grayscale data, the detected green grayscale data and the detected blue grayscale data of each pixel and the target red grayscale data, the target green grayscale data and the target blue grayscale data; The red grayscale difference value, the green grayscale difference value and the blue grayscale difference value are integrated into a first compensation file, and the first compensation file is used to perform pixel compensation on the grayscale image displayed by the display panel; and iteratively repeat all the above steps multiple times to obtain a second compensation file.

In one embodiment, the compensation file generation method of the present invention further includes the following steps: repeatedly executing all the aforementioned steps on a plurality of display panels to obtain a plurality of compensation files, and confirming a minimum number of iterations.

In one embodiment, the first compensation file is further burned into a display driver chip, so that when the display driver chip drives the display panel to display a frame of image, the first compensation file is executed at the same time to compensate the pixels of the frame of image, thereby confirming the compensation effect.

In a feasible embodiment, the display panel is any one selected from the group consisting of LCD panel, OLED panel, LED panel, Micro-LED panel, and QLED panel.

In one embodiment, the display panel defect detection system obtains the plurality of detected red grayscale data, the plurality of detected green grayscale data, and the plurality of detected blue grayscale data of each frame of grayscale image by executing the following steps: in each frame of grayscale image, a chromaticity coordinate and a luminance value (luminance) of each pixel are collected; the plurality of chromaticity coordinates and the plurality of luminance values are converted into a plurality of XYZ coordinates, wherein XYZ is tristimulus values; and the plurality of XYZ coordinates are converted into a plurality of RGB coordinates, wherein R is the detected red grayscale data, G is the detected green grayscale data, and B is the detected blue grayscale data.

Furthermore, the present invention also proposes an embodiment of a display panel defect detection system, which includes: a detection device facing a display panel; and an electronic device coupled to the detection device and at least one display driver chip for driving the display panel to display images; wherein the electronic device is configured to control the display driver chip and the detection device to operate to execute a compensation file The compensation file generation method includes the following steps: driving the display panel to display a plurality of grayscale images, then collecting a plurality of detected red grayscale data, a plurality of detected green grayscale data, and a plurality of detected blue grayscale data of a plurality of pixels in each grayscale image; in each grayscale image, the detected red grayscale data, the detected green grayscale data, and the detected blue grayscale data of the pixel at the center point are collected. and the detected blue grayscale data are set as a target red grayscale data, a target green grayscale data and a target blue grayscale data; in each frame of the grayscale image, a red grayscale difference, a green grayscale difference between the detected red grayscale data, the detected green grayscale data and the detected blue grayscale data and the target red grayscale data, the target green grayscale data and the target blue grayscale data of each pixel are calculated. A grayscale difference value and a blue grayscale difference value; integrating the plurality of red grayscale difference values, the plurality of green grayscale difference values and the plurality of blue grayscale difference values corresponding to the plurality of grayscale images into a first compensation file, and using the first compensation file to perform pixel compensation on the grayscale image displayed by the display panel; and iteratively repeating all the above steps multiple times to obtain a second compensation file.

In one embodiment, the compensation file generation method of the present invention further includes the following steps: repeatedly executing all the aforementioned steps on a plurality of display panels to obtain a plurality of compensation files, and confirming a minimum number of iterations.

In one embodiment, the first compensation file is further burned into a display driver chip, so that when the display driver chip drives the display panel to display a frame of image, the first compensation file is executed at the same time to compensate the pixels of the frame of image, thereby confirming the compensation effect.

In a feasible embodiment, the display panel is any one selected from the group consisting of LCD panel, OLED panel, LED panel, Micro-LED panel, and QLED panel.

In one embodiment, the display panel defect detection system obtains the plurality of detected red grayscale data, the plurality of detected green grayscale data, and the plurality of detected blue grayscale data of each frame of grayscale image by executing the following steps: in each frame of grayscale image, a chromaticity coordinate and a luminance value (luminance) of each pixel are collected; the plurality of chromaticity coordinates and the plurality of luminance values are converted into a plurality of XYZ coordinates, wherein XYZ is tristimulus values; and the plurality of XYZ coordinates are converted into a plurality of RGB coordinates, wherein R is the detected red grayscale data, G is the detected green grayscale data, and B is the detected blue grayscale data.

1a:OLED display device

11a: OLED panel

111a: Pixel circuit

112a: OLED element

12a: Display driver chip

121a: Demura compensation unit

2a: Host computer

11: Display panel

12: Display driver chip

2: Display panel defect detection system

21: Detection device

22: Electronic devices

S1: Drive a display panel to display multiple frames of grayscale images, and then collect multiple detection red grayscale data, multiple detection green grayscale data, and multiple detection blue grayscale data of multiple pixels in each frame of grayscale image.

S2: In each frame of grayscale image, the detected red grayscale data, the detected green grayscale data and the detected blue grayscale data of the pixel at the center point are set as a target red grayscale data, a target green grayscale data and a target blue grayscale data

S3: In each frame of grayscale image, calculate a red grayscale difference, a green grayscale difference and a blue grayscale difference between the detected red grayscale data, the detected green grayscale data and the detected blue grayscale data of each pixel and the target red grayscale data, the target green grayscale data and the target blue grayscale data

S4: Integrate the plurality of red grayscale difference values, the plurality of green grayscale difference values, and the plurality of blue grayscale difference values corresponding to the plurality of grayscale frames into a first compensation file, and use the first compensation file to perform pixel compensation on the grayscale image displayed by the display panel

S5: Iterate and repeat the above steps S1~S4 multiple times to obtain a second compensation file

FIG. 1 is a block diagram of a known OLED display device; FIG. 2 is a block diagram of a display panel defect detection system using a compensation document generation method of the present invention; and FIG. 3 is a flow chart of a compensation document generation method of the present invention.

In order to enable the review committee to further understand the structure, features, purpose, and advantages of the present invention, the detailed description of the drawings and preferred specific embodiments is attached as follows.

FIG. 2 is a block diagram of a display panel defect detection system using a compensation file generation method of the present invention. As shown in FIG. 2 , the display panel defect detection system 2 includes: a detection device 21 and an electronic device 22 , wherein the detection device 21 is configured to face a display panel 11 , and the electronic device 22 is coupled to the detection device 21 and at least one display driver chip 12 for driving the display panel 11 to display images. In an embodiment, the detection device 21 may be, but is not limited to, a CCD camera or a spectroradiometer, and the display panel 11 may be an LCD panel, an OLED panel, an LED panel, a Micro-LED panel, or a QLED panel. On the other hand, the electronic device 22 may be, but is not limited to, an industrial computer, a desktop computer, a notebook computer, an all-in-one computer, or a tablet computer.

In particular, the present invention proposes a compensation file generation method, which is executed by the electronic device 22 of the display panel defect detection system 2, thereby controlling the display driver chip 12 and the detection device 21 to operate to perform a panel defect detection operation on the display panel 11, and generating a compensation file based on the detection data of the panel defect detection operation, and finally burning the compensation file into the display driver chip 12, so that the display driver chip 12 has a demura function.

FIG3 is a flow chart of a compensation file generation method of the present invention. As shown in FIG3, the method flow first executes step S1: driving a display panel 11 to display a plurality of grayscale images, and then collecting a plurality of detection red grayscale data, a plurality of detection green grayscale data, and a plurality of detection blue grayscale data of a plurality of pixels of each grayscale image. To explain in more detail, the electronic device 22 of the display panel defect detection system 2 obtains the plurality of detection red grayscale data, the plurality of detection green grayscale data, and the plurality of detection blue grayscale data of each grayscale image by executing a plurality of detailed steps. First, in each frame of the grayscale image, a chromaticity coordinate (x, y) and a brightness value (Luminance) are collected for each pixel. Then, the multiple chromaticity coordinates and the multiple brightness values are converted into multiple XYZ coordinates using the following formula (1). Finally, the multiple XYZ coordinates are converted into multiple RGB coordinates using the following formula (2).

In formula (1), (x, y) is the CIE1931 chromaticity coordinate, Lv is the luminance, and (x, y) and Lv can be directly measured from the display panel 11 using a luminance colorimeter (i.e., the detection device 21). In addition, in formula (1), XYZ is the tristimulus values, and T1 is the first conversion matrix. On the other hand, in formula (2), R is the detected red grayscale data, G is the detected green grayscale data, B is the detected blue grayscale data, and T2 is the second conversion matrix.

As shown in FIG. 3 , the method flow then executes step S2: in each frame of the grayscale image, the detected red grayscale data, the detected green grayscale data and the detected blue grayscale data of the pixel located at the center point are set as a target red grayscale data, a target green grayscale data and a target blue grayscale data. Next, the method flow is to execute step S3: in each frame of the grayscale image, a red grayscale difference, a green grayscale difference and a blue grayscale difference are calculated between the detected red grayscale data, the detected green grayscale data and the detected blue grayscale data of each pixel and the target red grayscale data, the target green grayscale data and the target blue grayscale data. Furthermore, in step S4, the plurality of red grayscale differences, the plurality of green grayscale differences, and the plurality of blue grayscale differences corresponding to the plurality of grayscale frames are integrated into a first compensation file, and the first compensation file is used to perform pixel compensation on the grayscale image displayed by the display panel. Finally, the method flow is to execute step S5: iteratively repeat the aforementioned steps S1 to S4 a plurality of times, thereby obtaining a second compensation file.

It should be known that in step S1, the electronic device 22 controls the display driver chip 12 to drive the display panel 11 to display the grayscale image. Therefore, after obtaining the first compensation file, the first compensation file is burned into the display driver chip 12. In this way, when the display driver chip 12 is controlled to drive the display panel 11 to display the grayscale image, the display driver chip 12 will execute the first compensation file to perform pixel compensation on the grayscale image, and at this time, the demura compensation effect of the first compensation file on the display panel 11 can be confirmed.

If the demura compensation effect still needs to be improved, the aforementioned steps S1 to S4 can be repeated iteratively until the best demura compensation effect is achieved. At this time, the minimum number of iterations for a single display panel 11 can be confirmed, and the final version of the compensation file (i.e., the second compensation file) can be obtained. Furthermore, the compensation file generation method of the present invention including the aforementioned steps S1 to S5 can be applied to other multiple display panels 11 to generate corresponding compensation files, and at the same time confirm the universal minimum number of iterations.

Thus, the above has completely and clearly explained the compensation document generation method of the present invention; and, from the above, it can be known that the present invention has the following advantages:

(1) The present invention discloses a compensation file generation method, which is executed by a display panel defect detection system to control a display driver chip to drive a display panel to display multiple frames of grayscale images, then collect detection data of each frame of grayscale images, and obtain compensation data of each frame of grayscale images after data conversion and data processing. Afterwards, the compensation data is burned into the display driver chip to use the compensation data to perform pixel compensation on the grayscale images displayed by the display panel, thereby confirming the compensation effect. Continuing, after repeatedly executing the aforementioned detection data acquisition operation, compensation data generation operation, and compensation data chip writing operation multiple times, it is confirmed that the final compensation data has the best pixel compensation effect.

(2) The compensation document generation method of the present invention can be executed by an LCD panel defect detection system, an OLED panel defect detection system, an LED panel defect detection system, a Micro-LED panel defect detection system, or a QLED panel defect detection system, thereby generating a corresponding compensation document and burning it into an LCD display driver chip, an OLED display driver chip, an LED display driver chip, a Micro-LED display driver chip, or a QLED display driver chip.

(3) The present invention also proposes an embodiment of a display panel defect detection system, which includes: a detection device and an electronic device; and, its feature is that the electronic device is configured to control the display driver chip and the detection device to operate to execute a compensation file generation method of the present invention, thereby generating a compensation file burned into the display driver chip.

It must be emphasized that the above-mentioned case is a preferred embodiment. Any partial changes or modifications that are derived from the technical ideas of this case and are easily inferred by people familiar with the art do not deviate from the scope of the patent rights of this case.

In summary, this case shows that it is very different from the known technology in terms of purpose, means and effect, and it is the first invention that is practical and indeed meets the patent requirements for invention. We sincerely ask the review committee to examine it carefully and grant a patent as soon as possible to benefit the society. This is our utmost prayer.

S1: driving a display panel to display multiple frames of grayscale images, and then collecting multiple detection red grayscale data, multiple detection green grayscale data, and multiple detection blue grayscale data of multiple pixels in each frame of grayscale images S2: in each frame of grayscale images, setting the detection red grayscale data, the detection green grayscale data, and the detection blue grayscale data of the pixel at the center point as a target red grayscale data, a target green grayscale data, and a target blue grayscale data S3: In each frame of grayscale image, a red grayscale difference, a green grayscale difference and a blue grayscale difference are calculated between the detected red grayscale data, the detected green grayscale data and the detected blue grayscale data of each pixel and the target red grayscale data, the target green grayscale data and the target blue grayscale data S4: The plurality of red grayscale differences, the plurality of green grayscale differences and the plurality of blue grayscale differences corresponding to the plurality of frames of grayscale image are integrated into a first compensation file, and the first compensation file is used to perform pixel compensation on the grayscale image displayed by the display panel S5: Iterate and repeat the above steps S1 to S4 multiple times to obtain a second compensation file

Claims (8)

A method for generating a compensation file is performed by a display panel defect detection system, and includes: executing an iterative operation procedure on each of a plurality of display panels to obtain a qualified compensation file generated by a minimum number of iterations, and generating a common minimum number of iterations according to the maximum of the minimum number of iterations of the plurality of display panels; and executing the iterative operation procedure on a display panel other than the plurality of display panels according to the common minimum number of iterations to obtain the other compensation file. The qualified compensation file of the display panel; wherein the iterative operation procedure includes: step 1: driving the display panel to display a plurality of grayscale images, and then collecting a plurality of detected red grayscale data, a plurality of detected green grayscale data, and a plurality of detected blue grayscale data of a plurality of pixels of each grayscale image; step 2: in each grayscale image, the detected red grayscale data, the detected green grayscale data, and the detected blue grayscale data of the pixel located at the center point are set as a target a target red grayscale data, a target green grayscale data and a target blue grayscale data; step three: in each frame of the grayscale image, calculating a red grayscale difference, a green grayscale difference and a blue grayscale difference between the detected red grayscale data, the detected green grayscale data and the detected blue grayscale data of each pixel and the target red grayscale data, the target green grayscale data and the target blue grayscale data; step four: converting the plurality of red grayscale difference values corresponding to the plurality of grayscale images into a single pixel; , integrating a plurality of the green grayscale differences and a plurality of the blue grayscale differences into a first compensation file, and using the first compensation file to perform pixel compensation on the grayscale image displayed by the display panel; and iteratively repeating the steps 1 to 4 until the demura compensation effect of the first compensation file finally obtained on the display panel meets the requirements, thereby obtaining the minimum number of iterations, and taking the first compensation file finally obtained as the qualified compensation file. A compensation file generation method as described in claim 1, wherein the first compensation file is further burned into a display driver chip so that when the display driver chip drives the display panel to display a frame of image, it simultaneously executes the first compensation file to perform pixel compensation on the frame of image, thereby confirming the compensation effect. A method for generating a compensation document as described in claim 1, wherein the display panel is any one selected from the group consisting of an LCD panel, an OLED panel, an LED panel, a Micro-LED panel, and a QLED panel. A method for generating a compensation document as described in claim 1, wherein the display panel defect detection system obtains the plurality of detected red grayscale data, the plurality of detected green grayscale data, and the plurality of detected blue grayscale data for each frame of grayscale image by executing the following steps: in each frame of grayscale image, a chromaticity coordinate and a luminance value (Luminance) of each pixel are collected; the plurality of chromaticity coordinates and the plurality of luminance values are converted into a plurality of XYZ coordinates, wherein XYZ is tristimulus values; and the plurality of XYZ coordinates are converted into a plurality of RGB coordinates, wherein R is the detected red grayscale data, G is the detected green grayscale data, and B is the detected blue grayscale data. A display panel defect detection system includes: a detection device facing a display panel; and an electronic device coupled to the detection device and at least one display driver chip for driving the display panel to display images; wherein the electronic device is configured to control the display driver chip and the detection device to operate to execute a compensation file generation method, and the compensation file generation method includes: executing an iterative operation procedure on each of a plurality of display panels to obtain a qualified compensation file generated by a minimum number of iterations, and at the same time generating a compensation file based on the plurality of display panels; The maximum of the minimum iteration times of the panels generates a universal minimum iteration time; and the iterative operation procedure is executed on one of the other display panels other than the plurality of display panels according to the universal minimum iteration time to obtain the qualified compensation file of the other display panel; wherein the iterative operation procedure comprises: step 1: driving one of the display panels to display a plurality of grayscale images, and then collecting a plurality of detected red grayscale data, a plurality of detected green grayscale data and a plurality of detected blue grayscale data of a plurality of pixels of each grayscale image; step 2: In each frame of grayscale image, the detected red grayscale data, the detected green grayscale data and the detected blue grayscale data of the pixel located at the center point are set as a target red grayscale data, a target green grayscale data and a target blue grayscale data; Step 3: In each frame of grayscale image, a red grayscale difference, a green grayscale difference and a blue grayscale difference are calculated between the detected red grayscale data, the detected green grayscale data and the detected blue grayscale data of each pixel and the target red grayscale data, the target green grayscale data and the target blue grayscale data; Step 4: Integrate the plurality of red grayscale differences, the plurality of green grayscale differences and the plurality of blue grayscale differences corresponding to the plurality of frames of grayscale images into a first compensation file, and use the first compensation file to perform pixel compensation on the grayscale image displayed by the display panel; and iteratively repeat the steps 1 to 4 until the demura compensation effect of the first compensation file finally obtained on the display panel meets the requirements, thereby obtaining the minimum number of iterations, and taking the first compensation file finally obtained as the qualified compensation file. A display panel defect detection system as described in claim 5, wherein the first compensation file is further burned into a display driver chip so that when the display driver chip drives the display panel to display a frame of image, it simultaneously executes the first compensation file to perform pixel compensation on the frame of image, thereby confirming the compensation effect. A display panel defect detection system as described in claim 5, wherein the display panel is any one selected from the group consisting of LCD panel, OLED panel, LED panel, Micro-LED panel, and QLED panel. A display panel defect detection system as described in claim 5, wherein the electronic device obtains the plurality of detected red grayscale data, the plurality of detected green grayscale data, and the plurality of detected blue grayscale data for each frame of grayscale image by executing the following steps: in each frame of grayscale image, collecting a chromaticity coordinate and a luminance value (Luminance) of each pixel; converting the plurality of chromaticity coordinates and the plurality of luminance values into a plurality of XYZ coordinates, wherein XYZ is tristimulus values; and converting the plurality of XYZ coordinates into a plurality of RGB coordinates, wherein R is the detected red grayscale data, G is the detected green grayscale data, and B is the detected blue grayscale data.

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