DISPLAY PANEL AND DETECTION METHOD THEREOF, AND DISPLAY DEVICE

• US 20200135112A1
• Filed: 07/30/2019
• Published: 04/30/2020
• Est. Priority Date: 10/30/2018
• Status: Active Grant

• Current Assignee: Beijing BOE Display Technology Co Ltd (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Beijing BOE Display Technology Co Ltd (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Inventors: ZHANG, Xuru
• Granted Patent: US 11,024,229 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0295 by monitoring each display pixel
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2330/028 Generation of voltages supplied to electrode drivers in a matrix display other than LCD
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element

Abstract

A display panel, a detection method thereof and a display device are provided. The display panel includes a sub-pixel and a detection circuit, the sub-pixel includes a pixel circuit and a light-emitting element, the pixel circuit is configured to drive the light-emitting element to emit light; the detection circuit includes a detection signal terminal and a control voltage terminal, a first electrode of the light-emitting element is connected to the detection signal terminal, and a second electrode of the light-emitting element is connected to the control voltage terminal; and the detection circuit is configured to output a variable voltage through the control voltage terminal, the variable voltage includes a first sub-voltage signal, and the detection circuit is further configured to detect an electrical parameter at the first electrode of the light-emitting element in a case where the first sub-voltage signal is applied to the second electrode of the light-emitting element.

Claims

1. A display panel, comprising a sub-pixel and a detection circuit,

wherein the sub-pixel comprises a pixel circuit and a light-emitting element, and the pixel circuit is connected to the light-emitting element and is configured to drive the light-emitting element to emit light;

the detection circuit comprises a detection signal terminal and a control voltage terminal, a first electrode of the light-emitting element is connected to the detection signal terminal, and a second electrode of the light-emitting element is connected to the control voltage terminal; and

the detection circuit is configured to output a variable voltage, through the control voltage terminal, to the second electrode of the light-emitting element, the variable voltage comprises a first sub-voltage signal, and the detection circuit is further configured to detect an electrical parameter at the first electrode of the light-emitting element in a case where the first sub-voltage signal is applied to the second electrode of the light-emitting element.

2. The display panel according to claim 1, wherein the variable voltage further comprises a second sub-voltage signal, a level of the first sub-voltage signal is different from a level of the second sub-voltage signal, and

the detection circuit is further configured to apply the second sub-voltage signal to the second electrode of the light-emitting element such that the light-emitting element is capable of being driven to emit light.

3. The display panel according to claim 1, wherein the detection circuit comprises a first sub-circuit and a second sub-circuit,

a first terminal of the first sub-circuit, as the detection signal terminal, is connected to the first electrode of the light-emitting element, a second terminal of the first sub-circuit is connected to the second sub-circuit, a control terminal of the first sub-circuit is configured to receive a switch control signal, and the first sub-circuit is configured to disconnect or connect the second sub-circuit and the first electrode of the light-emitting element under control of the switch control signal;

and

the second sub-circuit is configured to detect the electrical parameter.

4. The display panel according to claim 3, wherein the control voltage terminal is further connected to the control terminal of the first sub-circuit to transmit the variable voltage to the control terminal of the first sub-circuit, and the variable voltage serves as the switch control signal.

5. The display panel according to claim 3, wherein the first sub-circuit comprises a switch element,

the first terminal of the first sub-circuit serves as an input terminal of the switch element, the second terminal of the first sub-circuit serves as an output terminal of the switch element, and the control terminal of the first sub-circuit serves as a control terminal of the switch element.

6. The display panel according to claim 3, wherein the detection circuit further comprises a control sub-circuit,

an output terminal of the control sub-circuit serves as the control voltage terminal, and the control sub-circuit is configured to generate and output the variable voltage.

7. The display panel according to claim 1, further comprising an array substrate and a drive chip,

wherein the drive chip is bonded to the array substrate through a flexible circuit board, the array substrate comprises the sub-pixel, and the drive chip comprises the detection circuit.

8. The display panel according to claim 1, further comprising a compensation circuit,

wherein the detection circuit is configured to detect a plurality of electrical parameters at the first electrode of the light-emitting element;

and

the compensation circuit is configured to calculate to obtain a compensated data voltage based on an initial data voltage according to the plurality of electrical parameters, and the compensated data voltage serves as a display data voltage for the sub-pixel to perform a display operation.

9. The display panel according to claim 8, wherein the compensation circuit comprises a calculation module and a first storage sub-circuit,

the calculation module is configured to:

acquire a plurality of detection data voltages, which are in one-to-one correspondence to the plurality of electrical parameters, for the sub-pixel,

calculate a characteristic parameter of the pixel circuit according to the plurality of electrical parameters and the plurality of detection data voltages, and

calculate the compensated data voltage based on the initial data voltage according to the characteristic parameter; and

the first storage sub-circuit is configured to store the characteristic parameter.

10. The display panel according to claim 8, wherein the compensation circuit comprises a calculation module and a first storage sub-circuit,

the calculation module is configured to:

acquire a plurality of detection data voltages, which are in one-to-one correspondence to the plurality of electrical parameters, for the sub-pixel,

calculate a characteristic parameter of the pixel circuit according to the plurality of electrical parameters and the plurality of detection data voltages,

calculate to obtain a plurality of standard compensation data voltages, which are in one-to-one correspondence to all gray scale levels of the sub-pixel, according to the characteristic parameter, and

acquire the compensated data voltage corresponding to the initial data voltage based on the plurality of standard compensation data voltages; and

the first storage sub-circuit is configured to store the plurality of standard compensation data voltages.

11. The display panel according to claim 2, wherein the pixel circuit comprises a drive sub-circuit, a data writing sub-circuit, and a second storage sub-circuit,

the data writing sub-circuit is configured to write a display data voltage that is received into the second storage sub-circuit under control of a scan signal;

the second storage sub-circuit is configured to store the display data voltage and maintain the display data voltage at a control terminal of the drive sub-circuit; and

the drive sub-circuit is configured to drive the light-emitting element to emit light under control of the display data voltage in a case where the second sub-voltage signal is applied to the second electrode of the light-emitting element.

12. The display panel according to claim 11, wherein the drive sub-circuit comprises a drive transistor, the data writing sub-circuit comprises a data writing transistor, the second storage sub-circuit comprises a storage capacitor,

a first electrode of the drive transistor is electrically connected to a power supply, a second electrode of the drive transistor is electrically connected to the first electrode of the light-emitting element, a gate electrode of the drive transistor is electrically connected to a second electrode of the data writing transistor and a first terminal of the storage capacitor, a first electrode of the data writing transistor is configured to receive the display data voltage, a gate electrode of the data writing transistor is configured to receive the scan signal, and a second terminal of the storage capacitor is electrically connected to the power supply.

13. The display panel according to claim 1, wherein the electrical parameter comprises a current at the first electrode of the light-emitting element.

15. A display device, comprising the display panel according to claim 1.

14. A display panel, comprising a sub-pixel and a detection circuit,

wherein the sub-pixel comprises a pixel circuit and a light-emitting element, the pixel circuit comprises a drive transistor, a data writing transistor, and a storage capacitor, the detection circuit comprises a first sub-circuit and a second sub-circuit, and the first sub-circuit comprises a switch element;

a first electrode of the drive transistor is electrically connected to a power supply, a second electrode of the drive transistor is electrically connected to a first electrode of the light-emitting element, a gate electrode of the drive transistor is electrically connected to a second electrode of the data writing transistor and a first terminal of the storage capacitor, a first electrode of the data writing transistor is configured to receive a display data voltage, a gate electrode of the data writing transistor is configured to receive a scan signal, and a second terminal of the storage capacitor is electrically connected to the power supply;

a second electrode of the light-emitting element is configured to receive a variable voltage, and the variable voltage comprises a first sub-voltage signal;

an input terminal of the switch element is connected to the first electrode of the light-emitting element, an output terminal of the switch element is connected to the second sub-circuit, a control terminal of the switch element is configured to receive the variable voltage, and the switch element is turned on in a case where the first sub-voltage signal is applied to the control terminal of the switch element; and

the second sub-circuit is configured to detect an electrical parameter at the first electrode of the light-emitting element in a case where the first sub-voltage signal is applied to the second electrode of the light-emitting element.

16. A detection method applied to a display panel, wherein the display panel comprises a sub-pixel and a detection circuit,

the sub-pixel comprises a pixel circuit and a light-emitting element, and the pixel circuit is connected to the light-emitting element and is configured to drive the light-emitting element to emit light;

the detection circuit comprises a detection signal terminal and a control voltage terminal, a first electrode of the light-emitting element is connected to the detection signal terminal, and a second electrode of the light-emitting element is connected to the control voltage terminal; and

the detection circuit is configured to output a variable voltage, through the control voltage terminal, to the second electrode of the light-emitting element, the variable voltage comprises a first sub-voltage signal, and the detection circuit is further configured to detect an electrical parameter at the first electrode of the light-emitting element in a case where the first sub-voltage signal is applied to the second electrode of the light-emitting element,

the detection method comprises;

controlling a state of the light-emitting element by the first sub-voltage signal of the variable voltage and detecting a plurality of electrical parameters of the first electrode of the light-emitting element.

17. The detection method according to claim 16, wherein controlling the state of the light-emitting element by the first sub-voltage signal of the variable voltage and detecting the plurality of electrical parameters of the first electrode of the light-emitting element comprises:

controlling the light-emitting element to be in a turn-off state by the first sub-voltage signal to detect the plurality of electrical parameters acquired by the first electrode of the light-emitting element.

18. The detection method according to claim 16, wherein the pixel circuit comprises a drive sub-circuit, and the detection method further comprises:

acquiring a plurality of detection data voltages, which are in one-to-one correspondence to the plurality of electrical parameters, for the sub-pixel; and

calculating to obtain a characteristic parameter of the drive sub-circuit according to the plurality of electrical parameters and the plurality of detection data voltages.

19. The detection method according to claim 18, further comprising:

calculating to obtain a plurality of standard compensation data voltages, which are in one-to-one correspondence to all gray scale levels of the sub-pixel, according to the characteristic parameter.

20. The detection method according to claim 19, wherein calculating to obtain a plurality of standard compensation data voltages, which are in one-to-one correspondence to all gray scale levels of the sub-pixel, according to the characteristic parameter comprises:

selecting a plurality of reference gray scale levels;

calculating a plurality of reference light-emitting currents, which are in one-to-one correspondence to the plurality of reference gray scale levels, based on a corresponding relation between a current of the light-emitting element and a brightness of the light-emitting element;

calculating a plurality of reference compensation data voltages, which are in one-to-one correspondence to the plurality of reference gray scale levels, according to the characteristic parameter and the plurality of reference light-emitting currents; and

calculating a plurality of standard compensation data voltages, which are in one-to-one correspondence to the all gray scale levels, according to the plurality of reference compensation data voltages.