Light-emitting substrate and display device

Patent metadata

Field	Value
Publication number	US-11776488-B2
Application number	US-202017251980-A
Country	US
Kind code	B2
Filing date	Nov 26, 2020
Priority date	Nov 9, 2020
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

A light-emitting substrate and a display device are provided by the present application. The durations of pre-set periods of a plurality of driving circuits decrease along a direction from close to data signal input terminals to away from the data signal input terminals, and/or durations of the pre-set periods of the plurality of driving circuits decrease along a direction from close to first control signal input terminals to away from the first control signal input terminals, which the light-emitting luminance of the light-emitting elements at a near-end and far-end solving a display problem with the display device.

First claim

What is claimed is:

1. A light-emitting substrate, comprising:
a plurality of data lines, wherein each of the data lines comprises a data signal input terminal;
a plurality of first control signal lines, wherein each of the first control signal lines comprises a first control signal input terminal; and
a plurality of driving circuits, wherein each of the driving circuits comprises:
a light-emitting element;
a switching transistor, wherein a gate electrode of the switching transistor is connected to the first control signal line, and a first electrode of the switching transistor is connected to the data line;
a driving transistor, wherein a gate electrode of the driving transistor is connected to a second electrode of the switching transistor, and one of a first electrode or a second electrode of the driving transistor is connected to the light-emitting element; and
a control unit, wherein the control unit is in series connection with connected to one of the first electrode or the second electrode of the driving transistor, wherein when the switching transistor is in an on state, the control unit is in an off state during a pre-set period, the switching transistor is in an on state during periods other than the pre-set period, and the driving transistor driving the light-emitting element to emit light during the periods other than the pre-set period when the switching transistor is in an on state,
wherein durations of the pre-set periods of the plurality of driving circuits decrease along a direction from close to the data signal input terminals to away from the data signal input terminals, or
durations of the pre-set periods of the plurality of driving circuits decrease along a direction from close to the first control signal input terminals to away from the first control signal input terminals.

2. The light-emitting substrate according to claim 1 , wherein the light-emitting substrate further comprises a plurality of second control signal lines, and
the control unit comprises a control transistor, a gate electrode of the control transistor is connected to the second control signal line, and the control transistor is connected to the second electrode of the driving transistor.

3. The light-emitting substrate according to claim 1 , wherein each of the first control signal lines is configured to transmit a first control signal, the switching transistor is in an on state according to a valid first control signal, and a falling edge of the valid first control signal is located in the pre-set period.

4. The light-emitting substrate according to claim 1 , wherein the light-emitting element is connected to the first electrode of the driving transistor.

5. The light-emitting substrate according to claim 1 , wherein the control unit is in an on state when the switching transistor is in an off state.

6. The light-emitting substrate according to claim 1 , wherein the light-emitting substrate is a display panel or a backlight module.

7. The light-emitting substrate according to claim 1 , wherein durations of the pre-set periods of the plurality of driving circuits decrease along a direction from close to the data signal input terminals to away from the data signal input terminals, and durations of the pre-set periods of the plurality of driving circuits decrease along a direction from close to the first control signal input terminals to away from the first control signal input terminals.

8. The light-emitting substrate according to claim 7 , wherein the duration of the pre-set periods of the driving circuits near both of the first control signal input terminal and the data signal input terminal is ⅜ of a valid period of the first control signal in which the switching transistor is in an on state, a duration of an overlapping period of the valid period of the first control signal and an valid period of the second control signal in which the control unit is in an on state is equal to ⅝ of the duration of the valid period of the first control signal.

9. The light-emitting substrate according to claim 1 , wherein the light-emitting element is at least one of submillimeter light-emitting diode, miniature light-emitting diode, or organic light-emitting diode.

10. The light-emitting substrate according to claim 1 , wherein the light-emitting substrate further comprises a data driving circuit and a gate electrode driving circuit, the data signal input terminals of the plurality of data lines are connected to the data driving circuit, and
the first control signal input terminals of the plurality of first control signal lines are connected to the gate electrode driving circuit.

11. The light-emitting substrate according to claim 1 , wherein the pre-set period is ¼, ⅛, 1/12, or 1/16 of duration of a valid period of the first control signal in which the switching transistor is in an on state.

12. A display device comprising a light-emitting substrate, wherein the light-emitting substrate comprises:
a plurality of data lines, wherein each of the data lines comprises a data signal input terminal;
a plurality of first control signal lines, wherein each of the first control signal lines comprises a first control signal input terminal; and
a plurality of driving circuits, wherein each of the driving circuits comprises:
a light-emitting element;
a switching transistor, wherein a gate electrode of the switching transistor is connected to the first control signal line, and a first electrode of the switching transistor is connected to the data line;
a driving transistor, wherein a gate electrode of the driving transistor is connected to a second electrode of the switching transistor, and one of a first electrode or a second electrode of the driving transistor is connected to the light-emitting element; and
a control unit, wherein the control unit is in series connection with connected to one of the first electrode or the second electrode of the driving transistor, wherein when the switching transistor is in an on state, the control unit is in an off state during a pre-set period, the switching transistor is in an on state during periods other than the pre-set period, and the driving transistor driving the light-emitting element to emit light during the periods other than the pre-set period when the switching transistor is in an on state;
wherein durations of the pre-set periods of the plurality of driving circuits decrease along a direction from close to the data signal input terminals to away from the data signal input terminals, or
durations of the pre-set periods of the plurality of driving circuits decrease along a direction from close to the first control signal input terminals to away from the first control signal input terminals.

13. The display device according to claim 12 , wherein the light-emitting substrate further comprises a plurality of second control signal lines; and
the control unit comprises a control transistor, a gate electrode of the control transistor is connected to the second control signal line, and the control transistor is connected to the second electrode of the driving transistor.

14. The display device according to claim 12 , wherein each of the first control signal lines is configured to transmit a first control signal, the switching transistor is in an on state according to a valid first control signal, and a falling edge of the valid first control signal is located in the pre-set period.

15. The display device according to claim 12 , wherein the light-emitting element is connected to the first electrode of the driving transistor.

16. The display device according to claim 12 , whe

Assignees

• Tcl China Star Optoelectronics Tech Co Ltd

Inventors

• Li Yan
• Zhang Yihe
• Li Lixia
• Quan Haiyan
• Han Duyeon

Classifications

• G09G3/3406 Primary

  Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336) · CPC title

• G09G3/32 Primary

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title

• G09G3/342

  using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines · CPC title

• G09G3/3413

  Details of control of colour illumination sources · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title