Emission driving circuit, driving method of the same, and display device

Patent metadata

Field	Value
Publication number	US-10726778-B2
Application number	US-201816167657-A
Country	US
Kind code	B2
Filing date	Oct 23, 2018
Priority date	Apr 20, 2018
Publication date	Jul 28, 2020
Grant date	Jul 28, 2020

Abstract

The present disclosure provides an emission driving circuit, which includes: a first node control module configured to provide an input signal or a high level signal to a first node based on a first clock signal and a second clock signal, to control a level at the first node; a second node control module configured to control a level at a second node based on the level at the first node, the first clock signal, the second clock signal, a first low level signal and the high level signal; and an output control module configured to control an output terminal to output high or low level based on level at the first node, level at the second node, the high level signal and a second low level signal. A low level of the first low level signal is different from a low level of the second low level signal.

First claim

What is claimed is:

1. An emission driving circuit, comprising:
a first node control module electrically connected to an input signal terminal, a first clock signal terminal, a second clock signal terminal and a high level signal terminal, and configured to provide an input signal or a high level signal to a first node based on a first clock signal and a second clock signal, to control a level at the first node;
a second node control module electrically connected to the first node, the first clock signal terminal, the second clock signal terminal, a first low level signal terminal and the high level signal terminal, and configured to control a level at a second node based on the level at the first node, the first clock signal, the second clock signal, a first low level signal and the high level signal; and
an output control module electrically connected to the first node, the second node, the high level signal terminal and a second low level signal terminal, and configured to control an output terminal to output a high level or a low level based on the level at the first node, the level at the second node, the high level signal and a second low level signal,
wherein a low level of the first low level signal is different from a low level of the second low level signal;
wherein the second node control module comprises a fourth transistor, a sixth transistor, a seventh transistor, an eleventh transistor and a third capacitor,
wherein the fourth transistor has a control terminal electrically connected to the first clock signal terminal, a first terminal electrically connected to the first low level signal terminal, and a second terminal electrically connected to a third node,
the eleventh transistor has a control terminal electrically connected to the second low level signal terminal, a first terminal electrically connected to the second terminal of the fourth transistor, and a second terminal electrically connected to the third node,
the sixth transistor has a control terminal electrically connected to the third node, a first terminal electrically connected to the second clock signal terminal, and a second terminal electrically connected to a fourth node,
the seventh transistor has a control terminal electrically connected to the second clock signal terminal, a first terminal electrically connected to the fourth node, and a second terminal electrically connected to the second node, and
the third capacitor has a first terminal electrically connected to the third node and a second terminal electrically connected to the fourth node.

2. The emission driving circuit according to claim 1 , wherein the low level of the first low level signal is less than the low level of the second low level signal.

3. The emission driving circuit according to claim 1 ,
wherein the first node control module comprises a first transistor, a second transistor and a third transistor, and
wherein the first transistor has a control terminal electrically connected to the first clock signal terminal, a first terminal electrically connected to the input signal terminal, and a second terminal electrically connected to the first node,
the second transistor has a control terminal electrically connected to the second clock signal terminal, a first terminal electrically connected to a second terminal of the third transistor, and a second terminal electrically connected to the first node, and
the third transistor has a control terminal electrically connected to the third node, and a first terminal electrically connected to the high level signal terminal.

4. The emission driving circuit according to claim 3 ,
wherein the first node control module further comprises a first capacitor having a first terminal electrically connected to the second clock signal terminal and a second terminal electrically connected to the first node.

5. The emission driving circuit according to claim 1 ,
wherein the second node control module further comprises, a fifth transistor, an eighth transistor, and a second capacitor,
the fifth transistor has a control terminal electrically connected to the first node, a first terminal electrically connected to the first clock signal terminal, and a second terminal electrically connected to the third node,
the eighth transistor has a control terminal electrically connected to the first node, a first terminal electrically connected to the high level signal terminal, and a second terminal electrically connected to the second node, and
the second capacitor has a first terminal electrically connected to the high level signal terminal and a second terminal electrically connected to the second node.

6. The emission driving circuit according to claim 5 , wherein the third capacitor has a capacitance in a range of 60 F to 150 F.

7. The emission driving circuit according to claim 5 , wherein a difference between the low level of the first low level signal and the low level of the second low level signal is in a range of 2V to 3V.

8. The emission driving circuit according to claim 7 , wherein the low level of the first low level signal is in a range of −9V to −10V, and the low level of the second low level signal is in a range of −7V to −8V.

9. The emission driving circuit according to claim 5 , wherein the fourth transistor has a channel with a width to length ratio less than 1.

10. The emission driving circuit according to claim 1 ,
wherein the output control module comprises a ninth transistor and a tenth transistor, and
wherein the ninth transistor has a control terminal electrically connected to the second node, a first terminal electrically connected to the high level signal terminal, and a second terminal electrically connected to the output terminal, and
the tenth transistor has a control terminal electrically connected to the first node, a first terminal electrically connected to the second low level signal terminal and a second terminal electrically connected to the output terminal.

11. The emission driving circuit according to claim 1 , comprising a first signal line, a second signal line, and a plurality of cascaded shift registers,
wherein the first clock signal terminal of each odd-numbered shift register of the plurality of cascaded shift registers and the second clock signal terminal of each even-numbered shift register of the plurality of cascaded shift registers are both electrically connected to the first signal line, and
the second clock signal terminal of each odd-numbered shift register of the plurality of cascaded shift registers and the first clock signal terminal of each even-numbered shift register of the plurality of cascaded shift registers are both electrically connected to the second signal line.

12. The emission driving circuit according to claim 11 , further comprising a start signal line,
wherein the input signal terminal of a shift register at a first stage of the plurality of cascaded shift registers is electrically connected to the start signal line, and the input signal terminal of a shift register at a nth stage of the plurality of cascaded shift registers is electrically connected to the output terminal of a shift register at a (n−1)th stage of the plurality of cascaded shift registers, wherein n is 2, 3, 4, . . . , or N, and N is a number of the plurality of cascaded shift registers in the emission driving circuit.

13. A display device, comprising an emission driving circuit, wherein the emission driving circuit comprises:
a first node control module electrically connected to an input signal terminal, a first clock signal terminal, a second clock signal terminal and a high level signal terminal, and configured to provide an inp

Assignees

• Shanghai Tianma Am Oled Co Ltd

Inventors

• Xiang Dongxu
• Li Yue
• Zhu Renyuan
• Gao Yana
• Zhou Xingyao
• Zhu Juan
• Cai Zhonglan
• Xu Yilin
• Huang Gaojun

Classifications

• G09G3/3208 Primary

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title

• G11C19/28

  using semiconductor elements (G11C19/14, G11C19/36 take precedence) · CPC title

• G09G2310/0286

  Details of a shift registers arranged for use in a driving circuit · CPC title

• G09G2320/064

  by time modulation of the brightness of the illumination source · CPC title

• G09G3/3266 Primary

  Details of drivers for scan electrodes · CPC title