Shift register circuit, scan driving circuit, display device and method for driving scan driving circuit

Patent metadata

Field	Value
Publication number	US-11222566-B2
Application number	US-201816145396-A
Country	US
Kind code	B2
Filing date	Sep 28, 2018
Priority date	Dec 15, 2017
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

A shift register circuit, a scan driving circuit, a display device and method for driving the scan driving circuit are provided. The shift register circuit includes: an input circuit for providing an active level for the first node upon receiving the active level of scan trigger signal; a trigger circuit for outputting the active level of scan trigger signal at the second node when first node is at the active level and a first clock signal is at first level; a locking circuit for locking the level of first node as inactive level when a first control signal is at the active level; and an output circuit for outputting a gate turn-on voltage during a period in which the second node is at an active level of the scan trigger signal, and outputting a voltage same as voltage of a second control signal during other periods other than the period.

First claim

What is claimed is:

1. A method for driving a scan driving circuit, wherein the scan driving circuit comprises a plurality of shift register circuits, and each of the shift register circuits comprises:
an input circuit connected to a first node and configured to provide, upon receiving an active level of a scan trigger signal, the active level for the first node;
a trigger circuit, connected respectively to the first node and a second node, and configured to provide the active level of the scan trigger signal for the second node when the first node is at the active level and a first clock signal is at a first level;
a locking circuit connected to the first node and configured to lock a level of the first node as an inactive level when a first control signal is at the active level; and
an output circuit connected to the second node and configured to output a gate turn-on voltage during a period in which the second node is at an active level of the scan trigger signal, and output a voltage same as a voltage of a second control signal during other periods other than the period;
and the method comprises:
switching the first control signal to an active level, and switching the second control signal to the gate turn-on voltage, to cause each of the shift register circuits in the scan driving circuit to output the gate turn-on voltage.

2. The method according to claim 1 , wherein the output circuit comprises at least two output sub-circuits,
the at least two output sub-circuits are both connected to the second node, each of the output sub-circuits is connected to a second clock signal, a duty cycle of the second clock signal is less than a duty cycle of the first clock signal, each of the output sub-circuits is connected to one of at least two scan output ends, and
the output sub-circuit is configured to provide a level same as the level of the second clock signal connected thereto for the scan output end connected thereto during a period in which the second node is at the active level of the scan trigger signal, and provide a voltage same as the voltage of the second control signal for the scan output end connected thereto during other periods other than the period.

3. The method according to claim 2 , wherein the output sub-circuit comprises a first tri-state gate and a second tri-state gate,
an input end of the first tri-state gate is connected to the second clock signal corresponding thereto, an output end thereof is connected to the scan output end corresponding thereto, and a control end thereof is connected to the second node, and
an input end of the second tri-state gate is connected to the second control signal, an output end thereof is connected to the scan output end corresponding thereto, and a control end thereof is connected to the second node.

4. The method according to claim 1 , wherein the locking circuit comprises a first transistor,
a gate electrode of the first transistor is connected to the first control signal, one of a source electrode and a drain electrode thereof is connected to a first voltage line for providing an inactive level of the first node, and the other is connected to the first node.

5. The method according to claim 1 , wherein the input circuit comprises a third tri-state gate and a fourth tri-state gate,
an input end of the third tri-state gate is connected to a forward scan input end, an output end thereof is connected to a third node, and a control end thereof is connected to a scan direction control signal, and
an input end of the fourth tri-state gate is connected to a reverse scan input end, an output end thereof is connected to the third node, and a control end thereof is connected to the scan direction control signal.

6. The method according to claim 5 , wherein the input circuit further comprises a first NOT gate,
an input end of the first NOT gate is connected to the third node, an output end thereof is connected to the first node, and an enabling end thereof is connected to the first dock signal, and the first level of the first clock signal is a level causing the first NOT gate to be in a nonworking state.

7. The method according to claim 1 , wherein the trigger circuit comprises a second NOT gate, a third NOT gate, a NAND gate, and a fourth NOT gate,
an input end of the second NOT gate is connected to a first input end of the NAND gate, an output end thereof is connected to the first node, and an enabling end thereof is connected to the first clock signal, the first level of the first clock signal is a high level, and the second NOT gate is in a working state when the enabling end is at a high level,
an input end of the third NOT gate is connected to the first node, and an output end thereof is connected to the first input end of the NAND gate,
a second input end of the NAND gate is connected to the first clock signal, an output end thereof is connected to an input end of the fourth NOT gate, and
an output end of the fourth NOT gate is connected to the second node.

Assignees

• Boe Technology Group Co Ltd
• Ordos Yuansheng Optoelectronics Co Ltd

Inventors

• Fu Yishan
• Fan Jun
• Li Fuqiang
• Wang Jiguo
• Shan Yue
• Liu taiyang

Classifications

• G11C19/28 Primary

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

• G09G3/20 Primary

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• G09G2300/0408

  Integration of the drivers onto the display substrate · CPC title