Gate driver circuit and display device including the same

Patent metadata

Field	Value
Publication number	US-11482179-B2
Application number	US-202117557122-A
Country	US
Kind code	B2
Filing date	Dec 21, 2021
Priority date	Dec 24, 2020
Publication date	Oct 25, 2022
Grant date	Oct 25, 2022

Abstract

A gate driver circuit includes a plurality of stage circuits, each stage circuit supplies a gate signal to each of gate lines arranged in a display panel and includes a M node, a Q node, a QH node, and a QB node, and each stage circuit includes a line selector, a Q node controller, a Q node and QH node stabilizer, an inverter, a QB node stabilizer, a carry signal output module, and a gate signal output module, and a high voltage level period of a carry clock signal is set not to overlap with a high voltage level period of a first scan clock signal.

First claim

What is claimed is:

1. A gate driver circuit for a display device, wherein the gate driver circuit comprises a plurality of stage circuits,
wherein each stage circuit supplies a gate signal to each gate line, and includes a M node, a Q node, a QH node, and a QB node,
wherein each stage circuit includes:
a line selector configured to:
operate in response to an input of a line sensing preparation signal to charge the M node based on a front carry signal; and
operate in response to an input of a reset signal to charge the Q node to a first high-potential voltage level; or
operate in response to an input of a panel on signal to discharges the Q node to a third low-potential voltage level;

a Q node controller configured to:
operate in response to an input of the front carry signal to charge the Q node to the first high-potential voltage level; and
operate in response to an input of a rear carry signal to discharge the Q node to the third low-potential voltage level;

a Q node and QH node stabilizer configured to discharge each of the Q node and the QH node to the third low-potential voltage level when the QB node has been charged to a second high-potential voltage level;
an inverter configured to change a voltage level of the QB node based on a voltage level of the Q node;
a QB node stabilizer configured to operate in response to an input of the rear carry signal, to an input of the reset signal, and to a charged voltage of the M node to discharge the QB node to a fourth low-potential voltage level;
a carry signal output module configured to operate based on the voltage level of the Q node or the voltage level of the QB node to output a carry signal based on a carry clock signal or the third low-potential voltage; and
a gate signal output module configured to operate based on the voltage level of the Q node or the voltage level of the QB node to output first to j-th gate signals based on first to j-th scan clock signals or a first low-potential voltage,
wherein a high voltage level period of the carry clock signal is set not to overlap with a high voltage level period of the first scan clock signal.

2. The gate driver circuit of claim 1 , wherein a rising edge timing of the carry clock signal is set to be the same as or later than a falling edge timing of the first scan clock signal.

3. The gate driver circuit of claim 1 , wherein a rising edge timing of the carry clock signal is set to be later than a rising edge timing of a j-th scan clock signal.

4. The gate driver circuit of claim 3 , wherein a falling edge timing of the carry clock signal is set to be later than a falling edge timing of the j-th scan clock signal.

5. The gate driver circuit of claim 1 , wherein the high voltage level period of the carry clock signal is set to overlap with a high voltage level period of a j-th scan clock signal.

6. A display device comprising:
a display panel including sub-pixels disposed at intersections between gate lines and data lines;
a gate driver circuit configured to supply a scan signal to each gate line;
a data driver circuit configured to supply a data voltage to each data line; and
a timing controller configured to control an operation of each of the gate driver circuit and the data driver circuit,
wherein the gate driver circuit includes a plurality of stage circuits,
wherein each stage circuit supplies a gate signal to each gate line, and includes a M node, a Q node, a QH node, and a QB node,
wherein each stage circuit includes:
a line selector configured to:
operate in response to an input of a line sensing preparation signal to charge the M node based on a front carry signal; and
operate in response to an input of a reset signal to charge the Q node to a first high-potential voltage level; or
operate in response to an input of a panel on signal to discharges the Q node to a third low-potential voltage level;

a Q node controller configured to:
operate in response to an input of the front carry signal to charge the Q node to the first high-potential voltage level; and
operate in response to an input of a rear carry signal to discharge the Q node to the third low-potential voltage level;

a Q node and QH node stabilizer configured to discharge each of the Q node and the QH node to the third low-potential voltage level when the QB node has been charged to a second high-potential voltage level;
an inverter configured to change a voltage level of the QB node based on a voltage level of the Q node;
a QB node stabilizer configured to operate in response to an input of the rear carry signal, to an input of the reset signal, and to a charged voltage of the M node to discharge the QB node to a fourth low-potential voltage level;
a carry signal output module configured to operate based on the voltage level of the Q node or the voltage level of the QB node to output a carry signal based on a carry clock signal or the third low-potential voltage; and
a gate signal output module configured to operate based on the voltage level of the Q node or the voltage level of the QB node to output first to j-th gate signals based on first to j-th scan clock signals or a first low-potential voltage,
wherein a high voltage level period of the carry clock signal is set not to overlap with a high voltage level period of the first scan clock signal.

7. The device of claim 6 , wherein a rising edge timing of the carry clock signal is set to be the same as or later than a falling edge timing of the first scan clock signal.

8. The device of claim 6 , wherein a rising edge timing of the carry clock signal is set to be later than a rising edge timing of a j-th scan clock signal.

9. The device of claim 8 , wherein a falling edge timing of the carry clock signal is set to be later than a falling edge timing of the j-th scan clock signal.

10. The device of claim 6 , wherein the high voltage level period of the carry clock signal is set to overlap with a high voltage level period of a j-th scan clock signal.

11. A stage circuit of a gate driver circuit for a display device that supplies a gate signal to a plurality of gate lines, comprising:
a line selector including 1st to 7th transistors and a pre-charging capacitor and configured to charge an M node based on a front carry signal, to charge a Q node to a first high-potential voltage level, and to discharge or reset the Q node to a third low-potential voltage level;
a Q node controller including 8th to 15th transistors and configured to charge the Q node to the first high-potential voltage level and to discharge the Q node to the third low-potential voltage level;
a Q node and QH node stabilizer including 16th and 17th transistors and configured to discharge each of the Q node and a QH node to the third low-potential voltage level;
an inverter including 18th to 22nd transistors and configured to change a voltage level of the QB node based on a voltage level of the Q node;
a QB node stabilizer including 23rd to 25th transistors and configured to discharge the QB node to a fourth low-potential voltage level;
a carry signal output module including 26th and 27th transistors and a 1st boosting capacitance and configured to output a carry signal based on a carry clock signal or the third low-potential voltage; and
a gate signal output module including 28th to 35th transistors and a 2nd boosting capacitance and configured to output first to j-th gate signals based on first to j-th scan clock signals or a first low-potential voltage,
wherein a high voltage level period of the carry clock signal does not overlap with a high voltage level period of the first scan clock signal.

12. The device of claim 11 , wherein the M no

Assignees

• Lg Display Co Ltd

Inventors

• Kim Kwangsoo
• Kim Yongho
• Chang Minkyu

Classifications

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title

• G09G2310/08

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

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2320/0295

  by monitoring each display pixel · CPC title

• G09G3/3266 Primary

  Details of drivers for scan electrodes · CPC title