Gate driving circuit having stabilization

Patent metadata

Field	Value
Publication number	US-11037517-B2
Application number	US-201916666054-A
Country	US
Kind code	B2
Filing date	Oct 28, 2019
Priority date	Sep 22, 2015
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A display device to display an image during frame intervals, and to display a blank image during a blank interval defined between the frame intervals, includes: a gate driving circuit including a plurality of stages, an ith stage (i is an integer greater than or equal to 2) from among the plurality of stages including a clock terminal to receive a clock signal, wherein the clock signal swings between a first clock voltage and a second clock voltage smaller than the first clock voltage during a normal interval corresponding to each of the frame intervals, and the clock signal is changed to a voltage lower than the second clock voltage during a stabilization interval corresponding to the blank interval.

First claim

What is claimed is:

1. A gate driving circuit comprising a plurality of stages, an i-th stage (i is an integer greater than or equal to 2) from among the plurality of stages being configured:
to receive a clock signal, a first carry signal, a second carry signal different from the first carry signal, a first low signal, and a second low signal; and
to output a i-th carry signal to a carry terminal and a i-th gate signal,
wherein the i-th stage comprises a control circuit comprising a first control transistor configured to control a potential of a Q-node in response to the first carry signal, a second control transistor configured to provide the second low signal to the Q-node in response to the second carry signal, and a third control transistor configured to provide a signal of the carry terminal to the Q-node,
wherein the third control transistor includes an input electrode directly connected to the carry terminal and an output electrode directly connected to the Q-node.

2. The gate driving circuit of claim 1 , wherein the first control transistor includes a control electrode and an input electrode that are commonly connected to an input terminal configured to receive the first carry signal, and an output electrode connected to the Q-node.

3. The gate driving circuit of claim 1 , wherein the second control transistor includes an input electrode connected to a voltage input terminal configured to receive the second low signal, a control electrode connected to a control terminal configured to receive the second carry signal, and an output electrode connected to the Q-node.

4. The gate driving circuit of claim 1 , wherein a voltage of the second low signal is lower than a voltage of the first low signal.

5. The gate driving circuit of claim 1 , wherein the second carry signal is generated based on a clock signal different from the clock signal.

6. A gate driving circuit comprising a plurality of stages, an i-th stage (i is an integer greater than or equal to 2) from among the plurality of stages being configured:
to receive a clock signal, a first carry signal, a second carry signal different from the first carry signal, a first low signal, and a second low signal; and
to output a i-th carry signal to a carry terminal and a i-th gate signal,
wherein the i-th stage comprises a control circuit comprising a first control transistor configured to control a potential of a Q-node in response to the first carry signal, a second control transistor configured to provide the second low signal to the Q-node in response to the second carry signal, and a third control transistor configured to provide a signal of the carry terminal to the Q-node, and
wherein the third control transistor includes a control electrode connected to a clock terminal, an input electrode connected to the carry terminal, and an output electrode connected to the Q-node.

7. The gate driving circuit of claim 6 , wherein the control circuit further comprises a fourth control transistor configured to provide the second low signal to the Q-node in response to a third carry signal different from the first carry signal and the second carry signal.

8. The gate driving circuit of claim 6 , wherein the i-th stage further comprises a first output circuit configured to be turned on/off according to a voltage of a Q-node and output the i-th gate signal including a gate-on signal and a gate-off signal from the clock signal to a gate output terminal of the i-th stage.

9. The gate driving circuit of claim 8 , wherein the first output circuit comprises a first output transistor, and
wherein the first output transistor comprises includes an input electrode for receiving the clock signal, a control electrode connected to the Q-node, and an output electrode for outputting the i-th gate signal.

10. The gate driving circuit of claim 9 , wherein the control circuit further comprises a capacitor, and
wherein the capacitor is connected between the output electrode of the first output transistor and the Q-node.

11. The gate driving circuit of claim 8 , wherein the i-th stage further comprises a first pull-down circuit configured to provide the first low signal to the gate output terminal after the gate-on signal is outputted from the first output circuit.

12. The gate driving circuit of claim 11 , wherein the first pull-down circuit comprises a first pull-down transistor, and
wherein the first pull-down transistor includes an input electrode connected to a voltage input terminal configured to receive the first low signal, a control electrode connected to a clock bar terminal, and an output electrode connected to the first output circuit.

13. The gate driving circuit of claim 8 , wherein the i-th stage further comprises a second output circuit configured to be turned on/off according to the potential of the Q-node and output the i-th carry signal including a carry-on signal and a carry-off signal from the clock signal to the carry terminal of the i-th stage.

14. The gate driving circuit of claim 13 , wherein the second output circuit comprises a second output transistor, and
wherein the second output transistor includes an input electrode for receiving the clock signal, a control electrode connected to the Q-node, and an output electrode for outputting the i-th carry signal.

15. The gate driving circuit of claim 13 , wherein the i-th stage further comprises a second pull-down circuit configured to provide the second low signal to the carry terminal after the carry-on signal is outputted from the second output circuit, and
wherein the input electrode of the third control transistor is connected to the second pull-down circuit.

16. The gate driving circuit of claim 15 , wherein the second pull-down circuit comprises a second pull-down transistor, and
wherein the second pull-down transistor includes an input electrode connected to a voltage input terminal configured to receive the second low signal, a control electrode connected to a clock bar terminal, and an output electrode connected to the second output circuit.

Assignees

• Samsung Display Co Ltd

Inventors

• Hwang Junghwan
• Shim Chanwook
• Jo Youngchul

Classifications

• G11C19/28 Primary

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

• G09G3/3677

  suitable for active matrices only · CPC title

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G2310/0267

  Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays · CPC title

• G09G3/3696 Primary

  Generation of voltages supplied to electrode drivers · CPC title