DISPLAY PANEL AND DISPLAY DEVICE

• US 20210027704A1
• Filed: 05/20/2019
• Published: 01/28/2021
• Est. Priority Date: 07/30/2018
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Chengdu BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd., Fuzhou BOE Optoelectronics Technology Co., Ltd. (BOE Technology Group Co., Ltd.)
• Inventors: TONG, Zhenxiao, HUANG, Weiyun, DONG, Xiangdan, LIU, Tingliang, XIAO, Yunsheng
• Granted Patent: US 10,997,905 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/043 Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
• CPC Class Codes: G09G 2320/0223 Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: 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
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes

Abstract

The present disclosure discloses a display panel and a display device. At least one load compensation unit is arranged in a non-display area, and the at least one load compensation unit can be configured to adjust the charging time of pixels by controlling gate lines, thereby making brightness of each area of the display screen uniform.

Claims

1. A display panel, comprising:

a plurality of gate lines;

a gate driving circuit, wherein the gate driving circuit comprises a plurality of output terminals, and at least one of the plurality of output terminals is electrically connected to at least one of the plurality of gate lines; and

at least one load compensation unit, between the at least one output terminal and the at least one gate line, and electrically connected with the at least one gate line and the at least one output terminal;

wherein the display panel comprises a display area and a non-display area surrounding the display area, the plurality of gate lines are in the display area, and the gate driving circuit and the at least one load compensation unit are in the non-display area; and

the at least one load compensation unit is configured to adjust charging time of pixels by controlling the gate lines, to make brightness of a plurality of areas of a display screen uniform.

2. The display panel according to claim 1, wherein each of the output terminals of the gate driving circuit is respectively connected to one of the plurality of gate lines, and different output terminals are connected to different gate lines.

3. The display panel according to claim 2, further comprising first voltage supply wires and a first voltage supply terminal;

wherein

the first voltage supply wires are in the display area, and the first voltage supply terminal is located in the non-display area and is electrically connected to the first voltage supply wires;

the first voltage supply wires and the plurality of gate lines are cross, all the load compensation units are sequentially divided into at least two unit groups along a direction of the first voltage supply wires away from the first voltage supply terminal, and each of the unit groups includes at least one load compensation unit; and

the farther the unit group is away from the first voltage supply terminal, the larger compensation load value of the load compensation unit in the unit group is.

4. The display panel according to claim 3, wherein the unit group comprises at least two adjacent load compensation units.

5. The display panel according to claim 4, wherein compensation load values of the load compensation units in a same unit group are the same, and the compensation load values in different unit groups are different.

6. The display panel according to claim 3, wherein a quantity of the load compensation units in each unit group is the same.

7. The display panel according to claim 1, wherein the load compensation unit comprises at least one of a compensation resistor and a compensation capacitor;

the output terminal of the gate driving circuit is electrically connected to the corresponding gate line through the compensation resistor; and

one terminal of the compensation capacitor is electrically connected to the output terminal of the gate driving circuit and the other terminal of the compensation capacitor is electrically connected to a ground terminal;

when the load compensation unit comprises the compensation resistor, a resistance value of the compensation resistor acts as a compensation load value of the load compensation unit;

when the load compensation unit comprises the compensation capacitor, a capacitance value of the compensation capacitor acts as the compensation load value of the load compensation unit; and

when the load compensation unit comprises the compensation resistor and the compensation capacitor, a product of the resistance value of the compensation resistor and the capacitance value of the compensation capacitor acts as the compensation load value of the load compensation unit.

8. The display panel according to claim 7, wherein the compensation resistor comprises:

a resistor wire with folding line-shape;

wherein one end of the resistor wire is electrically connected to the output terminal of the gate driving circuit, and the other end of the resistor wire is electrically connected to the gate line.

9. The display panel according to claim 8, wherein the resistor wire comprises:

a plurality of first resistor wires extending in a first direction and a plurality of second resistor wires extending in a second direction, and the first resistor wires are successively electrically connected to the second resistor wires; and

the first direction intersects with the second direction.

10. The display panel according to claim 9, wherein a cross-sectional area of at least one of the first resistor wires and the second resistor wires is smaller than a cross-sectional area of the gate line.

11. The display panel according to claim 8, further comprising:

a first conductive layer corresponding to each of the resistor wires and disposed in a different-layer and insulated from the resistor wire;

wherein an orthographic projection of the first conductive layer on the display panel has an overlap region with an orthographic projection of the corresponding resistor wire on the display panel; and

the compensation capacitor comprises;

a first capacitor between the first conductive layer and the resistor wire in the overlap region.

12. The display panel according to claim 11, wherein the orthographic projection of the first conductive layer on the display panel covers the orthographic projection of the corresponding resistor wire on the display panel.

13. The display panel according to claim 11, further comprising:

a second conductive layer connected between the first resistor wires and the second resistor wires;

wherein the orthographic projection of the first conductive layer on the display panel covers an orthographic projection of the second conductive layer on the display panel; and

the compensation capacitor further comprises;

a second capacitor between the first conductive layer and the second conductive layer.

14. The display panel according to claim 7, further comprising:

a third conductive layer corresponding to the output terminal, and a fourth conductive layer electrically connected to the output terminal, the output terminal is provided with the load compensation unit;

wherein the third conductive layer and the fourth conductive layer are in a different-layer and insulated from each other;

an orthographic projection of the third conductive layer on the display panel has an overlap region with an orthographic projection of the fourth conductive layer on the display panel; and

the compensation capacitor comprises;

a third capacitor between the fourth conductive layer and the third conductive layer in the overlap region.

15. The display panel according to claim 14, wherein the orthographic projection of the third conductive layer on the display panel covers the orthographic projection of the fourth conductive layer on the display panel.

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