Gate driving circuit and display device using the same

Patent metadata

Field	Value
Publication number	US-9941018-B2
Application number	US-201514857411-A
Country	US
Kind code	B2
Filing date	Sep 17, 2015
Priority date	Sep 17, 2014
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A gate driving circuit and a display device using the same are discussed. The gate driving circuit according to an embodiment includes a first shift register configured to sequentially shift a gate start pulse in response to a gate shift clock and output a gate pulse shifted on a per block basis, each block including a plurality of gate lines, a second shift register configured to sequentially shift the gate start pulse in response to the gate shift clock and output a gate pulse shifted on a per gate line basis, and a controller configured to supply the gate shift clock to one of the first and second shift registers.

First claim

What is claimed is:

1. A gate driving circuit comprising:
a first shift register configured to sequentially shift a gate start pulse in response to a gate shift clock and output a gate pulse shifted on a per block basis, each block including a plurality of gate lines;
a second shift register configured to sequentially shift the gate start pulse in response to the gate shift clock and output a gate pulse shifted on a per gate line basis; and
a controller configured to supply the gate shift clock to the first shift register in a block driving mode and supply the gate shift clock to the second shift register in a line sequential driving mode,
wherein a first output voltage of the first shift register is supplied to OR gates of a first block connected to a plurality of gate lines belonging to the first block through a first common line,
wherein output voltages sequentially output from the second shift register are supplied to an OR gate of the first block,
wherein a second output voltage of the first shift register is supplied to OR gates of a second block connected to a plurality of gate lines belonging to the second block through a second common line, and
wherein output voltages sequentially output from the second shift register are supplied to an OR gate of the second block.

2. The gate driving circuit of claim 1 , wherein the first shift register, the second shift register, and the controller are directly formed on a substrate of a display panel along with a pixel array of the display panel, or are integrated into one integrated circuit and are attached to the substrate of the display panel.

3. The gate driving circuit of claim 1 , further comprising AND gates, level shifters, and buffers between the first and second shift registers and the OR gates of the first and second blocks.

4. The gate driving circuit of claim 1 , wherein in the block driving mode, the controller sequentially supplies the gate pulse to the gate lines on a per block basis, and
wherein in the line sequential driving mode, the controller sequentially supplies the gate pulse synchronized with a data voltage to the gate lines.

5. The gate driving circuit of claim 1 , wherein the controller commonly supplies the gate start pulse to the first and second shift registers, and individually supplies the gate shift clock to the first and second shift registers based on the block driving mode and the line sequential driving mode.

6. The gate driving circuit of claim 1 , wherein in the block driving mode, the gate pulses are simultaneously supplied to the gate lines in one block.

7. A display device comprising:
a display panel including a pixel array including pixels arranged in a matrix form based on a crossing structure of data lines and gate lines;
a first shift register configured to sequentially shift a gate start pulse in response to a gate shift clock and output a gate pulse shifted on a per block basis, each block including a plurality of gate lines;
a second shift register configured to sequentially shift the gate start pulse in response to the gate shift clock and output a gate pulse shifted on a per gate line basis; and
a controller configured to supply the gate shift clock to the first shift register in a block driving mode and supply the gate shift clock to the second shift register in a line sequential driving mode,
where in a first output voltage of the first shift register is supplied to OR gates of a first block connected to a plurality of gate lines belonging to the first block through a first common line,
wherein output voltages sequentially output from the second shift register are supplied to an OR gate of the first block,
wherein a second output voltage of the first shift register is supplied to OR gates of a second block connected to a plurality of gate lines belonging to the second block through a second common line, and
wherein output voltages sequentially output from the second shift register are supplied to an OR gate of the second block.

8. The display device of claim 7 , wherein the first shift register, the second shift register, and the controller are directly formed on a substrate of the display panel along with the pixel array, or are integrated into one integrated circuit and are attached to the substrate of the display panel.

9. The display device of claim 7 , further comprising AND gates, level shifters, and buffers between the first and second shift registers and the OR gates of the first and second blocks.

10. The display device of claim 7 , wherein in the block driving mode, the controller sequentially supplies the gate pulse to the gate lines on a per block basis, and
wherein in the line sequential driving mode, the controller sequentially supplies the gate pulse synchronized with a data voltage to the gate lines.

11. The display device of claim 10 , wherein when data of an input image is written on the pixels, the display panel is driven in the line sequential driving mode.

12. The display device of claim 11 , wherein when the pixels are discharged or initialized on a per block basis, or when black data is written on the pixels, the display panel is driven in the block driving mode.

13. The display device of claim 11 , wherein when changes in characteristics of thin film transistors formed in the pixels with the passage of time are sensed on a per block basis, the display panel is driven in the block driving mode.

14. The display device of claim 10 , wherein the display panel is driven in the line sequential driving mode and the block driving mode in one frame period.

15. The display device of claim 7 , wherein the controller commonly supplies the gate start pulse to the first and second shift registers, and individually supplies the gate shift clock to the first and second shift registers based on the block driving mode and the line sequential driving mode.

16. The display device of claim 7 , wherein in the block driving mode, the gate pulses are simultaneously supplied to the gate lines in one block.

Assignees

• Lg Display Co Ltd

Inventors

• Hong Seokhyun
• Lee Chulwon
• Noh Juyoung
• Do Osung

Classifications

• G09G3/3674

  Details of drivers for scan electrodes · CPC title

• G09G2310/0218

  with collection of electrodes in groups for n-dimensional addressing · CPC title

• G11C19/00 Primary

  Digital stores in which the information is moved stepwise, e.g. shift registers · 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

• G09G2310/0286

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