Gate driving circuit, gate driving method and display device

Patent metadata

Field	Value
Publication number	US-9305498-B2
Application number	US-201414492897-A
Country	US
Kind code	B2
Filing date	Sep 22, 2014
Priority date	May 8, 2014
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

The present disclosure discloses a gate driving circuit, a gate driving method and a display device. The gate driving circuit includes a plurality of cascaded shift register units for outputting gate driving signals, each of the gate driving signals being output by a gate driving signal output terminal of each shift register unit; the gate driving circuit further includes: a gate driving control unit connected with the shift register unit for controlling the gate driving signal to be transmitted to N rows of pixel circuits time-divisionally, wherein N is a positive integer greater than or equal to 2.

First claim

What is claimed is:

1. A gate driving circuit, comprising a plurality of cascaded shift register units for outputting gate driving signals, each of the gate driving signals being output by a gate driving signal output terminal of each of the shift register units; the gate driving circuit further comprises:
a gate driving control unit, connected with the shift register unit and configured to control the gate driving signal to be transmitted to N rows of pixel circuits time-divisionally, wherein N is a positive integer greater than or equal to 2.

2. The gate driving circuit according to claim 1 , wherein, the gate driving control unit comprises:
N control switches respectively connected between the gate driving signal output terminal and the N rows of pixel circuits;
wherein the gate driving signal is controlled to be transmitted to the N rows of pixel circuits time-divisionally through respectively accessing switch signals of the N control switches.

3. The gate driving circuit according to claim 2 , wherein, the gate driving control unit comprises N control transistors, each of the N control transistor comprises a gate electrode, a first electrode and a second electrode;
wherein a i th control transistor has a first electrode accessing the gate driving signal, a gate electrode accessing a i th switch signal, and a second electrode being connected with a j th row of pixel circuits;
a i+1 th control transistor has a first electrode accessing the gate driving signal, a gate electrode accessing a i+1 th switch signal, and a second electrode being connected with a j+1 th row of pixel circuits;
wherein, the i th switch signal and the i+1 th switch signal are clock signals, there is a difference of 360/N° between a phase of the i th switch signal and a phase of the i+1 th switch signal, a clock period of the i th switch signal is equal to a valid time of the gate driving signal, and a clock period of the i+1 th switch signal is equal to the valid time of the gate driving signal;
a sum of time during which the N control transistors are turned on within one clock period is equal to the valid time of the gate driving signal;
i is a positive integer, and 1≦i≦N−1, j is a positive integer, and 1≦j≦M−1, M is a total number of rows of the pixel circuits.

4. The gate driving circuit according to claim 3 , wherein, the gate driving control unit comprises:
a first control transistor, wherein a first electrode of the first control transistor accesses the gate driving signal, a gate electrode of the first control transistor accesses a first switch signal, and a second electrode of the first control transistor is connected with the j th row of pixel circuits; and
a second control transistor, wherein a first electrode of the second control transistor accesses the gate driving signal, a gate electrode of the second control transistor accesses a second switch signal, and a second electrode of the second control transistor is connected with the j+1 th row of pixel circuits;
the first switch signal and the second switch signal are clock signals, a phase of the first switch signal is opposite to a phase of the second switch signal, and a clock period of the first switch signal and a clock period of the second switch signal are both equal to the valid time of the gate driving signal;
a sum of time during which the first switch signal controls the first control transistor to be turned on and time during which the second switch signal controls the second control transistor to be turned on within one clock period is the valid time of the gate driving signal.

5. The gate driving circuit according to claim 3 , wherein, the gate driving control unit comprises:
a first control transistor, wherein a first electrode of the first control transistor accesses the gate driving signal, a gate electrode of the first control transistor accesses a first switch signal, and a second electrode of the first control transistor is connected with a k th row of pixel circuits;
a second control transistor, wherein a first electrode of the second control transistor accesses the gate driving signal, a gate electrode of the second control transistor accesses a second switch signal, and a second electrode of the second control transistor is connected with a k+1 th row of pixel circuits; and
a third control transistor, wherein a first electrode of the third control transistor accesses the gate driving signal, a gate electrode of the third control transistor accesses a third switch signal, and a second electrode of the third control transistor is connected with a k+2 th row of pixel circuits;
the first switch signal, the second switch signal and the third switch signal are clock signals;
a phase of the first switch signal, a phase of the second switch signal and a phase of the third switch signal differ by 120° in sequence;
a clock period of the first switch signal, a clock period of the second switch signal and a clock period of the third switch signal are all equal to the valid time of the gate driving signal;
a sum of time during which the first switch signal controls the first control transistor to be turned on, time during which the second switch signal controls the second control transistor to be turned on, and time during which the third switch signal controls the third control transistor to be turned on within one clock period is the valid time of the gate driving signal;
k is a positive integer, and 1≦k≦M−2.

6. The gate driving circuit according to claim 1 , wherein, the shift register unit comprises: a first output control unit, a second output control unit, a first node control unit, a second node control unit and a reset unit, wherein the first node control unit is connected with the first output control unit through a first node, the second node control unit is connected with the second output control unit through a second node,
the first output control unit is configured to control the gate driving signal output terminal to output a first clock signal when a potential of the first node is a high level;
the second output control unit is configured to control a potential of the gate driving signal to be a first low level when a potential of the second node is a high level; the gate driving signal is output by the gate signal output terminal;
a first node control unit is configured to control the potential of the first node to be a high level when an input signal is a high level and control the potential of the first node to be the first low level when the potential of the second node is a high level; the input signal is input by an input terminal;
the second node control unit is configured to control the potential of the second node to be the first low level when the potential of the first node is a high level and control the potential of the second node to be a high level when a potential of a second clock signal is a high level; and
a reset unit is configured to control the potential of the first node to be a second low level when a reset signal is a high level and control the potential of the gate driving signal to be a low level when the potential of the second clock signal is a high level; the reset signal is input by a reset terminal;
a phase of the first clock signal is opposite to a phase of the second clock signal.

7. The gate driving circuit according to claim 6 , wherein, the shift register unit further comprises a starting unit for controlling the potential of the second node to be a high level when a starting signal input to the starting unit is a high level so as to reset the second node and the gate driving signal output terminal before the shift register unit works.

8. The gate driving circuit according to claim 6 , wherein, the first output control

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Optoelectronics

Inventors

• Wang Shijun

Classifications

• G09G3/3677 Primary

  suitable for active matrices only · CPC title

• G09G2300/0465

  Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness · CPC title

• G09G3/36 Primary

  using liquid crystals · CPC title

• G09G2310/0205

  Simultaneous scanning of several lines in flat panels · CPC title

• G09G2310/0286

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