EMISSION DRIVING CIRCUIT, DRIVING METHOD OF THE SAME, AND DISPLAY DEVICE

• US 20190325815A1
• Filed: 10/23/2018
• Published: 10/24/2019
• Est. Priority Date: 04/20/2018
• Status: Active Grant

• Current Assignee: Wuhan Tianma Micro-Electronics Company Limited (Wuhan Donghu New Technology Development Zone Production Promotion Centre), Wuhan Tianma Microelectronics Company Limited Shanghai Branch
• Original Assignee: Shanghai Tianma AM-OLED Co. Ltd (Tianma Microelectronics Company Limited)
• Inventors: XIANG, Dongxu, LI, Yue, ZHU, Renyuan, GAO, Yana, ZHOU, Xingyao, ZHU, Juan, CAI, Zhonglan, XU, Yilin, HUANG, Gaojun
• Granted Patent: US 10,726,778 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes
• CPC Class Codes: G11C 19/28 using semiconductor elements G11C19/14, G11C19/36 take precedence

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.

Claims

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.

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 a 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 comprises a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a second capacitor and a third capacitor, and

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 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 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,

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,

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, and

the third capacitor has a first terminal electrically connected to the third node and a second terminal electrically connected to the fourth 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 5,

wherein the second node control module further comprises an eleventh transistor having a control terminal electrically connected to the first low level signal terminal or 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.

11. 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.

12. 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.

13. The emission driving circuit according to claim 12, 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 n^th 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.

14. 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 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.

15. The display device according to claim 14, wherein the low level of the first low level signal is less than the low level of the second low level signal.

16. The emission driving circuit according to claim 14, comprising a first signal line, a second signal line, and a plurality of cascaded shift registers,

wherein the first clock signal terminal of a shift register at each odd-numbered stage of the plurality of cascaded shift registers and the second clock signal terminal of a shift register at each even-numbered stage of the plurality of cascaded shift registers are both electrically connected to the first signal line, and

the second clock signal terminal of the shift register at each odd-numbered stage of the plurality of cascaded shift registers and the first clock signal terminal of the shift register at each even-numbered stage of the plurality of cascaded shift registers are both electrically connected to the second signal line.

17. The emission driving circuit according to claim 16, 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 n^th 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.

18. A driving method of an emission driving circuit, applicable in 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 method comprises;

providing, by the first node control module, a high level at the first node;

maintaining, by the second node control module, the second node at a high level in a previous phase; and

maintaining, by the output control module, the output terminal at a low level outputted in a previous phase based on the high level at the first node and the high level at the second node, in a first phase when the input signal provided by the input signal terminal is at a high level, the first clock signal provided by the first clock signal terminal is at a low level, and the second clock signal provided by the second clock signal terminal is at a high level;

providing, by the first node control module, a high level at the first node;

providing, by the second node control module, a low level at the second node; and

controlling, by the output control module, the output terminal to output a high level based on the high level at the first node and the low level at the second node, in a second phase when the input signal provided by the input signal terminal is at a low level, the first clock signal provided by the first clock signal terminal is at a high level, and the second clock signal provided by the second clock signal terminal is at a low level;

providing, by the first node control module, a low level at the first node;

providing, by the second node control module, a high level at the second node; and

controlling, by the output control module, the output terminal to output a low level based on the low level at the first node and the high level at the second node, in a third phase when the input signal provided by the input signal terminal is at a low level, the first clock signal provided by the first clock signal terminal is at a low level, the second clock signal provided by the second clock signal terminal is at a high level; and

providing, by the first node control module, a low level at the first node;

providing, by the second node control module, a high level at the second node; and

controlling, by the output control module, the output terminal to output a low level based on the low level at the first node and the high level at the second node, in a fourth phase when the input signal provided by the input signal terminal is at a low level, the first clock signal provided by the first clock signal terminal is at a high level, the second clock signal provided by the second clock signal terminal is at a low level.

19. The driving method of an emission driving circuit according to claim 18, wherein a low level of the first low level signal is less than a low level of the second low level signal.