# US 12,118,906 B2 · Method for sensing display panel, and display panel

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- Number: US 12,118,906 B2
- Document ID: US12118906B2
- Status: Granted
- Kind: B2
- Application number: 17/764,992
- Filed: 2021-05-28
- Published: 2024-02-15
- Granted: 2024-10-15
- Earliest claimed: 2021-05-28
- Assignees: Hefei BOE Joint Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Applicants: Hefei BOE Joint Technology Co., Ltd.; BOE Technology Group Co., Ltd.
- Inventors: Xiaolong Wei; Fei Yang; Song Meng; Jingbo Xu; Jianbo Xian
- Web page: https://patentgrep.com/patent/US12118906B2

## 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 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G 2320/029: by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
- G09G 2320/0295: by monitoring each display pixel
- 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 for sensing a display panel includes: sensing an electrical characteristic parameter of a driving transistor of a pixel circuit of a sub-pixel in an X-th row in a blank stage between an N-th frame and an (N+1)-th frame, wherein X is a random number, and both N and X are positive integers.

## Claims

### Claim 1

A method for sensing a display panel, comprising:
sensing an electrical characteristic parameter of a driving transistor of a pixel circuit of a sub-pixel in an X-th row in a blank stage between an N-th frame and an (N+1)-th frame;
wherein both N and X are positive integers, and the X is a random number;
wherein the sensing an electrical characteristic parameter of a driving transistor of a pixel circuit of a sub-pixel in an X-th row in a blank stage between an N-th frame and an (N+1)-th frame comprises:
generating a sensing clock signal by using a random control signal; and
generating, by a sensing driving circuit, a sensing control signal provided for the pixel circuit of the sub-pixel in the X-th row in the blank stage between the N-th frame and the (N+1)-th frame by using the sensing clock signal, a sensing starting signal, and an enable control signal;
wherein the sensing clock signal, the sensing starting signal, and the enable control signal are pulse signals; a pulse width of a sensing pulse of the sensing starting signal is greater than a pulse width of a clock pulse of the sensing clock signal and is not greater than twice the pulse width of the clock pulse, and a pulse width of the enable control signal is greater than the pulse width of the sensing pulse.

### Claim 2 (depends on 1)

The method of claim 1, wherein the X is a non-repeating random number determined by traversing a first range, wherein the first range comprises positive integers not greater than R, and the R is a total number of rows of sub-pixels of the display panel.

### Claim 3 (depends on 2)

The method of claim 2, wherein in a first sensing cycle, a value range of the N is the first range.

### Claim 4 (depends on 1)

The method of claim 1, wherein a relationship between N and X within at least one sensing cycle is determined by a Randperm function.

### Claim 5 (depends on 4)

The method of claim 4, wherein a random array is obtained by the Randperm function, and the X is an N-th element value in the random array.

### Claim 6 (depends on 1)

The method of claim 1, wherein the sensing starting signal comprises a sensing pulse, and R clock pulses are at least comprised between adjacent sensing pulses, wherein the R is a total number of rows of sub-pixels of the display panel.

### Claim 7 (depends on 1)

The method of claim 1, wherein a sensing pulse provided by the sensing starting signal in the N-th frame is shifted to output to the pixel circuit of the sub-pixel in the X-th row by the sensing driving circuit in the blank stage between the N-th frame and the (N+1)-th frame.

### Claim 8 (depends on 7)

The method of claim 7, wherein the sensing clock signal provided for the sensing driving circuit in the N-th frame comprises a first clock pulse group, wherein the first clock pulse group comprises X clock pulses, and a starting moment of a first clock pulse in the X clock pulses is not earlier than a starting moment of the sensing pulse in the sensing starting signal provided for the sensing driving circuit in the N-th frame.

### Claim 9 (depends on 1)

The method of claim 1, further comprising: after completing sensing the electrical characteristic parameter of the driving transistor of the pixel circuit of the sub-pixel in the X-th row, resetting the sensing driving circuit by using a second clock pulse group of the sensing clock signal, wherein the second clock pulse group comprises X1 clock pulses, X1 is greater than R−X, and the R is a total number of rows of sub-pixels of the display panel.

### Claim 10 (depends on 9)

The method of claim 9, further comprising: generating, by the sensing driving circuit, a sensing control signal provided for a pixel circuit of a sub-pixel in a Y-th row in a blank stage between an (N+1)-th frame and an (N+2)-th frame by using a sensing pulse provided by the sensing starting signal in the (N+1)-th frame, a first clock pulse group provided by the sensing clock signal in the (N+1)-th frame, and the enable control signal, wherein the first clock pulse group provided by the sensing clock signal in the (N+1)-th frame comprises Y clock pulses; and the Y is a random positive integer, and the Y is different from the X.

### Claim 11 (depends on 10)

The method of claim 10, wherein Y clock pulses and X1 clock pulses are not continuous.

### Claim 12 (depends on 10)

The method of claim 10, further comprising: after completing sensing the electrical characteristic parameter of the driving transistor of the pixel circuit of the sub-pixel in the Y-th row, resetting the sensing driving circuit by using a second clock pulse group of the sensing clock signal, wherein the second clock pulse group comprises Y1 clock pulses, the Y1 is greater than R−Y, and the R is a number of rows of sub-pixels of the display panel.

### Claim 13 (depends on 1)

The method of claim 1, wherein the sensing an electrical characteristic parameter of a driving transistor of a pixel circuit of a sub-pixel in an X-th row in a blank stage between an N-th frame and an (N+1)-th frame comprises:
sensing the electrical characteristic parameter of the driving transistor of the pixel circuit of sub-pixels of b colors in the X-th row of sub-pixels in the blank stage between the N-th frame and the (N+1)-th frame, wherein b is a positive integer, and b is less than or equal to a number of sub-pixels comprised in one pixel unit.

### Claim 14

A display panel, comprising a pixel array and a gate driver, wherein
the pixel array comprises a plurality of sub-pixels, and at least one sub-pixel comprises a light emitting element and a pixel circuit that drives the light emitting element to emit light;
the gate driver is configured to provide a sensing control signal for the pixel circuit of a sub-pixel in an X-th row by a sensing control line in a blank stage between an N-th frame and an (N+1)-th frame, to sense an electrical characteristic parameter of the driving transistor of the pixel circuit of the sub-pixel in the X-th row;
wherein both N and X are positive integers, and the X is a random number;
further comprising a timing controller, wherein
the timing controller is configured to generate a sensing clock signal by using a random control signal, and provide the sensing clock signal for the gate driver; and
the gate driver is configured to generate a sensing control signal provided for the pixel circuit of the sub-pixel in the X-th row in the blank stage between the N-th frame and the (N+1)-th frame by using the sensing clock signal, a sensing starting signal, and an enable control signal;
wherein the sensing clock signal, the sensing starting signal, and the enable control signal are pulse signals; a pulse width of a sensing pulse of the sensing starting signal is greater than a pulse width of a clock pulse of the sensing clock signal and is not greater than twice the pulse width of the clock pulse, and a pulse width of the enable control signal is greater than the pulse width of the sensing pulse.

### Claim 15 (depends on 14)

The display panel of claim 14, wherein the timing controller comprises: a random signal generation circuit, configured to generate the random control signal.

### Claim 16 (depends on 14)

The display panel of claim 14, wherein the gate driver comprises: a sensing driving circuit, wherein the sensing driving circuit comprises: a plurality of cascaded shift register units and a plurality of logical AND gates;
an output end of an i-th-stage shift register unit is connected to an input end of an (i+1)-th-stage shift register unit, and an input end of a first-stage shift register unit is connected to a sensing starting signal line that provides a sensing starting signal; and
clock ends of the plurality of shift register units are connected to a sensing clock signal line that provides a sensing clock signal;
an input end of an i-th logical AND gate is connected to an output end of the i-th-stage shift register unit and an enable control line that provides an enable control signal, and an output end of the i-th logical AND gate is connected to a sensing control line connected to the pixel circuit of the sub-pixel in an i-th row;
wherein i is a positive integer.

### Claim 17 (depends on 14)

The display panel of claim 14, wherein the pixel circuit comprises: an input transistor, a driving transistor, a sensing transistor, and a first storage capacitor;
a control electrode of the input transistor is connected to a scanning signal line, a first electrode of the input transistor is connected to a data signal line, and a second electrode of the input transistor is connected to a control electrode of the driving transistor;
a first electrode of the driving transistor is connected to a first power supply line, and a second electrode of the driving transistor is connected to a light emitting element;
a first electrode of the first storage capacitor is connected to the control electrode of the driving transistor, and a second electrode of the first storage capacitor is connected to the second electrode of the driving transistor; and
a control electrode of the sensing transistor is connected to a sensing control line, a first electrode of the sensing transistor is connected to the second electrode of the driving transistor, and a second electrode of the sensing transistor is connected to a sensing signal line.