Gate driving circuit and array substrate using the same

Patent metadata

Field	Value
Publication number	US-10297216-B2
Application number	US-201614907930-A
Country	US
Kind code	B2
Filing date	Jan 12, 2016
Priority date	Dec 24, 2015
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

A gate driving circuit and an array substrate using the same are described. The gate driving circuit pulls up and pulls down the voltage level of the node in one display frame by a first voltage signal of a second driving module and a second voltage signal of a third driving module to control the high level and low level respectively of scan signal in the scan output terminal for sequentially writing data signal to all the first row sub-pixels, all the second row sub-pixels and all the third row sub-pixels of the one display frame in order to prevent the sub-pixels from RC delay and color deviation, thereby improving the display quality of the LCD.

First claim

What is claimed is:

1. A gate driving circuit which is disposed on an array substrate of a liquid crystal display (LCD), wherein the array substrate comprises a display frame having a plurality of first row sub-pixels, a plurality of second row sub-pixels and a plurality of third row sub-pixels, and each of the first row sub-pixels, the second row sub-pixels and the third row sub-pixels is electrically connected to one scan line corresponding to the gate driving circuit, the gate driving circuit comprising:
a first driving circuit, for receiving a clock signal wherein the first driving circuit comprises a node and a scan output terminal correspondingly connected to a scan line, and comprises a first transistor and a second transistor;
a second driving circuit electrically connected to the first driving circuit, for receiving a previous stage control signal and a first voltage signal wherein when the previous stage control signal enables the second driving circuit, the second driving circuit outputs the first voltage signal to the first driving circuit in order to pull up a level of the node to a high level, and when the node is in the high level, the scan output terminal correspondingly outputs a first scan signal with the high level to the scan line based on a period of the clock signal in order to drive the first row sub-pixels;
a third driving circuit electrically connected to the first driving circuit and the second driving circuit, for receiving a next stage control signal and a second voltage signal wherein when the next stage control signal enables the third driving circuit, the third driving circuit outputs the second voltage signal to the second driving circuit in order to pull down the level of node and the scan output terminal to the low level, and when the node is in the low level, the scan output terminal correspondingly outputs the first scan signal with the low level to the scan line based on the period of the clock signal until the first row sub-pixels are driven by different gate driving circuits respectively;
a third transistor comprising a third source electrode, a third gate electrode and a third drain electrode wherein the third source electrode receives the first voltage signal, the third gate electrode receives the previous stage control signal, and the third drain electrode is connected to the node; and
a fourth transistor comprising a fourth source electrode, a fourth gate electrode and a fourth drain electrode wherein the fourth source electrode receives the first voltage signal which received by the fourth gate electrode, and the fourth drain electrode is connected to the third driving circuit;
a fifth transistor comprising a fifth source electrode, a fifth gate electrode and a fifth drain electrode wherein the fifth source electrode is connected to the fourth source electrode, the fifth gate electrode is connected to the node, and the fifth drain electrode is connected to the second driving circuit and the third driving circuit.

2. The gate driving circuit of claim 1 , wherein the display frame is sequentially arranged by different types of the first row sub-pixels, the second row sub-pixels and the third row sub-pixels, and the first row sub-pixels, the second row sub-pixels and the third row sub-pixels form the display frame.

3. The gate driving circuit of claim 2 , wherein the first row sub-pixels, the second row sub-pixels and the third row sub-pixels are composed of the red row sub-pixels, the green row sub-pixels and the blue row sub-pixels.

4. The gate driving circuit of claim 1 , wherein a level of the first voltage signal is greater than a level of the second voltage signal, and the first voltage signal is a positive voltage level and the second voltage signal is a negative voltage level.

5. The gate driving circuit of claim 1 , wherein a driving sequence of the display frame is the first row sub-pixels, the second row sub-pixels and the third row sub-pixels.

6. The gate driving circuit of claim 1 , wherein the first driving circuit comprises:
the first transistor comprising a first source electrode, a first gate electrode and a first drain electrode wherein the first source electrode receives the clock signal, the first gate electrode is connected to the node, and the first drain electrode is connected to scan output terminal for correspondingly outputting the first scan signal to the scan line based on the period of the clock signal;
the second transistor comprising a second source electrode, a second gate electrode and a second drain electrode wherein the second source electrode is connected to the first source electrode for receiving the clock signal, the second gate electrode is connected to the first gate electrode and the node, and the second drain electrode outputs a current stage control signal which is the same as the first scan signal of the scan output terminal; and
a capacitor having two terminals, wherein the two terminals of the capacitor are electrically connected to the node and the scan output terminal.

7. The gate driving circuit of claim 1 , wherein the third driving circuit comprises:
a sixth transistor comprising a sixth source electrode, a sixth gate electrode and a sixth drain electrode wherein the sixth source electrode is connected to the second driving circuit, the sixth gate electrode is connected to the node, and the sixth drain electrode outputs the second voltage level;
a seventh transistor comprising a seventh source electrode, a seventh gate electrode and a seventh drain electrode wherein the seventh source electrode is connected to the first driving circuit and the second driving circuit, the seventh gate electrode is connected to the sixth source electrode, and the seventh drain electrode is connected to the sixth drain electrode for receiving the second voltage level;
an eighth transistor comprising an eighth source electrode, an eighth gate electrode and an eighth drain electrode wherein the eighth source electrode is connected to the node, the eighth gate electrode receives the next stage control signal, and the eighth drain electrode is connected to the sixth drain electrode and the seventh drain electrode for receiving the second voltage level; and
a ninth transistor comprising a ninth source electrode, a ninth gate electrode and a ninth drain electrode wherein the ninth source electrode is connected to the scan output terminal, the ninth gate electrode is connected to the eighth gate electrode for receiving the next stage control signal, and the ninth drain electrode is connected to the sixth drain electrode, the seventh drain electrode and the eighth drain electrode for receiving the second voltage level.

8. The gate driving circuit of claim 1 , wherein the first scan signal of one gate driving circuit overlaps a second scan signal of another gate driving circuit during a duty cycle of the clock signal for charging the scan line in the next stage in advance.

9. An array substrate, comprising a gate driving circuit described in the claim 1 .

Assignees

• Shenzhen China Star Optoelect

Inventors

• Wang Xiaoxiao
• Du Peng

Classifications

• G02F1/13454

  Drivers integrated on the active matrix substrate (G02F1/136277 takes precedence) · CPC title

• G09G3/3696

  Generation of voltages supplied to electrode drivers · CPC title

• G02F1/1303

  Apparatus specially adapted to the manufacture of LCDs · CPC title

• G09G3/2074

  using sub-pixels · CPC title

• G09G2310/0235

  Field-sequential colour display · CPC title