# US 12,223,864 B2 · Display apparatus and method of repairing display defect in display panel

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- Number: US 12,223,864 B2
- Document ID: US12223864B2
- Status: Granted
- Kind: B2
- Application number: 18/021,590
- Filed: 2022-04-14
- Published: 2024-08-08
- Granted: 2025-02-11
- Earliest claimed: 2022-04-14
- Assignees: Ordos Yuansheng Optoelectronics Co., Ltd.; Boe Technology Group Co., Ltd.
- Applicants: Ordos Yuansheng Optoelectronics Co., Ltd.; Boe Technology Group Co., Ltd.
- Inventors: Nini Bai; Yonghong Zhang; Liangliang Liu
- Web page: https://patentgrep.com/patent/US12223864B2

## CPC

- G09G 3/006: {Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309)}
- G09G 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters}
- G09G 3/3291: in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2330/08: Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared
- G09G 2330/10: Dealing with defective pixels
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

A method of repairing a display defect in a display panel includes: in a module process stage, inputting a first data voltage to each pixel in the display panel, enabling the display panel to display an image to be detected, and acquiring a brightness of each pixel; determining a reference pixel and a defect pixel according to the image to be detected; calculating a compensation data voltage for the defect pixel according to a brightness difference between the reference pixel and the defect pixel; and inputting the first data voltage to the reference pixel, and inputting a second data voltage to the defect pixel, according to the compensation data voltage, where the second data voltage is a sum of the first data voltage and the compensation data voltage.

## Claims

### Claim 1

A method of repairing a display defect in a display panel, comprising:
in a module process stage, inputting a first data voltage to each pixel in the display panel, enabling the display panel to display an image to be detected, and acquiring a brightness of each pixel;
determining a reference pixel and a defect pixel according to the image to be detected;
calculating a compensation data voltage for the defect pixel according to a brightness difference between the reference pixel and the defect pixel; and
inputting the first data voltage to the reference pixel, and inputting a second data voltage to the defect pixel, according to the compensation data voltage, wherein the second data voltage is a sum of the first data voltage and the compensation data voltage,
wherein the determining a reference pixel and a defect pixel comprises:
determining a criterion driving current according to a known normal display panel and a known defect display panel;
acquiring a current driving current of each pixel, and comparing the current driving current of each pixel with the criterion driving current;
determining the pixel is as the defect pixel if the current driving current of a pixel is greater than the criterion driving current; and
determining the pixel is as the reference pixel if the current driving current of the pixel is less than or equal to the criterion driving current,
wherein the determining a criterion driving current comprises:
acquiring a first driving current of each pixel in the known normal display panel, and recording a maximum value of the first driving current;
acquiring a second driving current of each pixel in the known defect display panel, and recording a minimum value of the second driving current;
comparing the maximum value of the first driving current with the minimum value of the second driving current, and
determining the minimum value of the second driving current as the criterion driving current, if a ratio of the maximum value of the first driving current to the minimum value of the second driving current is greater than a preset value.

### Claim 2 (depends on 1)

The method of repairing a display defect in a display panel according to claim 1, wherein the acquiring a brightness of each pixel comprises:
photographing the image to be detected using a high-definition camera, and acquiring a picture of the image to be detected; and
converting the picture into matrix data through Fourier transform, and performing enhancement processing on the matrix data to acquire the brightness of each pixel.

### Claim 3 (depends on 2)

The method of repairing a display defect in a display panel according to claim 2, wherein the performing enhancement processing on the matrix data comprises:
squaring or logarithmizing the matrix data.

### Claim 4 (depends on 3)

The method of repairing a display defect in a display panel according to claim 3, wherein the compensation data voltage comprises a first compensation data voltage; and
the first compensation data voltage is a difference between a peak value of the first data voltage input to the reference pixel and a current data voltage of the defect pixel.

### Claim 5 (depends on 4)

The method of repairing a display defect in a display panel according to claim 4, wherein the compensation data voltage further comprises a second compensation data voltage; and
the second compensation data voltage is obtained through calculating with a compensation algorithm.

### Claim 6 (depends on 5)

A display apparatus, comprising a display panel and a storage module, wherein the storage module stores a compensation data voltage; the compensation data voltage is obtained through the method of repairing a display defect in a display panel according to claim 5.

### Claim 7 (depends on 4)

A display apparatus, comprising a display panel and a storage module, wherein the storage module stores a compensation data voltage; the compensation data voltage is obtained through the method of repairing a display defect in a display panel according to claim 4.

### Claim 8 (depends on 3)

A display apparatus, comprising a display panel and a storage module, wherein the storage module stores a compensation data voltage; the compensation data voltage is obtained through the method of repairing a display defect in a display panel according to claim 3.

### Claim 9 (depends on 2)

The method of repairing a display defect in a display panel according to claim 2, wherein each pixel comprises a red sub-pixel, a green sub-pixel and a blue sub-pixel; and the inputting a first data voltage to each pixel in the display panel comprises:
sequentially inputting a first red data voltage, a first green data voltage and a first blue data voltage to each red sub-pixel, each green sub-pixel and each blue sub-pixel in the display panel, respectively.

### Claim 10 (depends on 9)

A display apparatus, comprising a display panel and a storage module, wherein the storage module stores a compensation data voltage; the compensation data voltage is obtained through the method of repairing a display defect in a display panel according to claim 9.

### Claim 11 (depends on 2)

A display apparatus, comprising a display panel and a storage module, wherein the storage module stores a compensation data voltage; the compensation data voltage is obtained through the method of repairing a display defect in a display panel according to claim 2.

### Claim 12 (depends on 1)

The method of repairing a display defect in a display panel according to claim 1, wherein the calculating a compensation data voltage for the defect pixel according to a brightness difference between the reference pixel and the defect pixel comprises:
adjusting a brightness of the defect pixel to enable a current of the defect pixel to be less than or equal to the criterion driving current;
recording data voltages of the defect pixel before and after the adjusting a brightness of the defect pixel; and
calculating the compensation data voltage according to the data voltages of the defect pixel before and after the adjusting a brightness of the defect pixel.

### Claim 13 (depends on 12)

A display apparatus, comprising a display panel and a storage module, wherein the storage module stores a compensation data voltage; the compensation data voltage is obtained through the method of repairing a display defect in a display panel according to claim 12.

### Claim 14 (depends on 1)

The method of repairing a display defect in a display panel according to claim 1, wherein subsequent to the calculating a compensation data voltage for the defect pixel according to a brightness difference between the reference pixel and the defect pixel, the method further comprises:
storing the compensation data voltage.

### Claim 15 (depends on 14)

The method of repairing a display defect in a display panel according to claim 14, wherein subsequent to the storing the compensation data voltage, the method further comprises:
extracting the stored compensation data voltage, and inputting the compensation data voltage to the defect pixel; and;
determining that the display defect is successfully repaired if a brightness of the defect pixel is less than or equal to a brightness of the reference pixel.

### Claim 16 (depends on 1)

A display apparatus, comprising a display panel and a storage module, wherein the storage module stores a compensation data voltage; the compensation data voltage is obtained through the method of repairing a display defect in a display panel according to claim 1.