Backlight and display device

Patent metadata

Field	Value
Publication number	US-10204567-B2
Application number	US-201615200323-A
Country	US
Kind code	B2
Filing date	Jul 1, 2016
Priority date	Jan 4, 2016
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

The invention provides a backlight and a display device, the backlight includes multiple backlight scanning lines and multiple backlight data lines, which are provided in different layers and are intersected with each other to divide the backlight into a plurality of light-emitting units, each of which is provided with one light-emitting diode and a light-emitting circuit for driving the light-emitting diode to emit light, the light-emitting circuits for a same row of light-emitting units are electrically connected to a corresponding backlight scanning line, the light-emitting circuits for a same column of light-emitting units are electrically connected to a corresponding backlight data line, the backlight scanning line is configured for providing a scanning signal to the light-emitting circuit, and the backlight data line is configured for providing a gray scale signal to the light-emitting circuit to control brightness of the light-emitting unit.

First claim

What is claimed is:

1. A backlight for supplying a light source to a display panel, including a plurality of backlight scanning lines and a plurality of backlight data lines, wherein the plurality of backlight scanning lines and the plurality of backlight data lines are provided in different layers, and the plurality of backlight scanning lines and the plurality of backlight data lines are intersected with each other to divide the backlight into a plurality of light-emitting units, each of which is provided therein with one light-emitting diode and a light-emitting circuit for driving the light-emitting diode to emit light, the light-emitting circuits for a same row of light-emitting units are electrically connected to a corresponding backlight scanning line, the light-emitting circuits for a same column of light-emitting units are electrically connected to a corresponding backlight data line, the backlight scanning line is configured for providing a scanning signal to the light-emitting circuit, and the backlight data line is configured for providing a gray scale signal to the light-emitting circuit to control brightness of the light-emitting unit,
wherein the backlight is divided into at least two light-emitting regions, each light-emitting region includes at least one light-emitting unit, the light-emitting diodes in a same light-emitting region share a cathode, and the light-emitting diodes in different light-emitting regions correspond to different cathodes.

2. The backlight of claim 1 , wherein the light-emitting circuit includes a gray scale signal input unit, a driving transistor, an energy storage unit, a compensation unit and a high level signal input terminal,
a gate of the driving transistor is electrically connected to a first terminal of the energy storage unit, and a second terminal of the energy storage unit is electrically connected to the high level signal input terminal;
a control terminal of the gray scale signal input unit is electrically connected to a corresponding backlight scanning line, an input terminal of the gray scale signal input unit is electrically connected to a corresponding backlight data line, an output terminal of the gray scale signal input unit is electrically connected to a first electrode of the driving transistor, and when a valid scanning signal received by the backlight scanning line and a gray scale signal input by the backlight data line is received by the control terminal of the gray scale signal input unit, the input terminal and the output terminal of the gray scale signal input unit are conductive so as to store the gray scale signal in the energy storage unit;
a control terminal of the compensation unit is electrically connected to the backlight scanning line, an input terminal of the compensation unit is electrically connected to a second electrode of the driving transistor, an output terminal of the compensation unit is electrically connected to the first terminal of the energy storage unit, and when a valid scanning signal output by the backlight scanning line is received by the control terminal of the compensation unit, the input terminal and the output terminal of the compensation unit are conductive so as to store a threshold voltage of the driving transistor in the energy storage unit.

3. The backlight of claim 2 , wherein the light-emitting circuit further includes a reset unit and a reset voltage input terminal, a control terminal of the reset unit is electrically connected to a reset signal input terminal, a first input terminal of the reset unit is electrically connected to the gate of the driving transistor, a second input terminal of the reset unit is electrically connected to the reset voltage input terminal, and when a valid reset signal is received by the control terminal of the reset unit, the first input terminal and the second input terminal of the reset unit are conductive.

4. The backlight of claim 3 , wherein the reset unit includes a reset transistor, a gate of the reset transistor serves as the control terminal of the reset unit, a first electrode of the reset transistor serves as the first terminal of the reset unit, and a second electrode of the reset transistor serves as the second terminal of the reset unit.

5. The backlight of claim 2 , wherein the backlight further includes a plurality of light-emitting control lines, each row of light-emitting units correspond to one light-emitting control line, the light-emitting circuit further includes a first light-emitting control unit, a control terminal of the first light-emitting control unit is electrically connected to the light-emitting control line, an input terminal of the first light-emitting control unit is electrically connected to the second electrode of the driving transistor, an output terminal of the first light-emitting control unit is electrically connected to an anode of the light-emitting diode, and when the light-emitting control line provides a valid light-emitting control signal, the input terminal and the output terminal of the first light-emitting control unit are conductive.

6. The backlight of claim 5 , wherein the light-emitting circuit further includes a second light-emitting control unit, an input terminal of the second light-emitting control unit is electrically connected to the high level signal input terminal, an output terminal of the second light-emitting control unit is electrically connected to the first terminal of the driving transistor, a control terminal of the second light-emitting control unit is electrically connected to the light-emitting control line, and when the light-emitting control line provides the valid light-emitting control signal, the input terminal and the output terminal of the second light-emitting control unit are conductive.

7. The backlight of claim 6 , wherein the first light-emitting control unit includes a first light-emitting control transistor, a gate of the first light-emitting control transistor serves as the control terminal of the first light-emitting control unit, a first electrode of the first light-emitting control transistor serves as the input terminal of the first light-emitting control unit, and a second electrode of the first light-emitting control transistor serves as the output terminal of the first light-emitting control unit; and
the second light-emitting control unit includes a second light-emitting control transistor, a gate of the second light-emitting control transistor serves as the control terminal of the second light-emitting control unit, a first electrode of the second light-emitting control transistor serves as the input terminal of the second light-emitting control unit, and a second electrode of the second light-emitting control transistor serves as the output terminal of the second light-emitting control unit.

8. The backlight of claim 5 , wherein the backlight includes a shift register, the shift register includes a plurality of stages of shift register units which are cascaded, the shift register unit includes a scanning signal output module and a light-emitting control signal output module, the scanning signal output module is configured for providing a scanning signal to the backlight scanning line of the backlight, and the light-emitting control signal output module is configured for providing a light-emitting control signal to the light-emitting control signal line of the backlight.

9. The backlight of claim 8 , wherein a control terminal of the light-emitting control signal output module is electrically connected to an output terminal of the scanning signal output module, and the light-emitting control signal output module is able to output the light-emitting control signal after receiving the scanning signal output by the scanning signa

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Optoelectronics Tech Co Ltd

Inventors

• Yang Shengji
• Chen Xiaochuan
• Wang Panhua
• Dong Xue
• Xue Hailin
• Wang Haisheng
• Liu Yingming

Classifications

• G09G2320/0646

  Modulation of illumination source brightness and image signal correlated to each other · CPC title

• G09G2300/0814

  used for selection purposes, e.g. logical AND for partial update · CPC title

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title

• G09G2300/0809

  Several active elements per pixel in active matrix panels · CPC title

• G09G3/3225

  using an active matrix · CPC title