Display panel and scan driver circuit thereof suitable for narrow border application

Patent metadata

Field	Value
Publication number	US-11475813-B2
Application number	US-202017067795-A
Country	US
Kind code	B2
Filing date	Oct 12, 2020
Priority date	Jan 22, 2020
Publication date	Oct 18, 2022
Grant date	Oct 18, 2022

Abstract

A scan driver circuit including shift register units and gate control circuits is provided. The shift register units are in a peripheral area of a display panel, and for receiving first clock signals. The gate control circuits are in an active area of the display panel, and for receiving second clock signals. Each shift register unit is coupled with corresponding N of the gate control circuits, and for providing a corresponding one of the first clock signals as a control signal to the corresponding N of the gate control circuits. The corresponding N of the gate control circuits are coupled with corresponding M of gate lines. The corresponding N of the gate control circuits are for providing, according to the control signal, corresponding M of the second clock signals as M gate signals to the corresponding M of gate lines, in which M and N are positive integers.

First claim

What is claimed is:

1. A scan driver circuit, comprising:
a plurality of stages of shift register unit, disposed in a peripheral area of a display panel, and configured to receive a plurality of first clock signals; and
a plurality of gate control circuits, disposed in an active area of the display panel, and configured to receive a plurality of second clock signals, wherein the active area comprises a plurality of pixel circuits, and the plurality of pixel circuits are coupled with a plurality of gate lines of the display panel,
wherein each stage of shift register unit is coupled with corresponding N of the plurality of gate control circuits, and is configured to provide a corresponding one of the plurality of first clock signals as a control signal to the corresponding N of the plurality of gate control circuits,
the corresponding N of the plurality of gate control circuits are coupled with corresponding M of the plurality of gate lines, and are configured to provide, according to the control signal, corresponding M of the plurality of second clock signals respectively as M gate signals to the corresponding M of the plurality of gate lines, respectively, where M and N are positive integers,
wherein each of the corresponding N of the plurality of gate control circuits comprises:
a first transistor, comprising a first terminal, a second terminal, and a control terminal, wherein the first terminal of the first transistor is configured to receive a corresponding one of the plurality of second clock signals, the second terminal of the first transistor is coupled with one of the corresponding M of the plurality of gate lines, and the control terminal of the first transistor is coupled with the shift register unit and configured to receive the control signal; and
a second transistor, comprising a first terminal, a second terminal, and a control terminal, wherein the first terminal of the second transistor and the control terminal of the second transistor are coupled with the second terminal of the first transistor, and the second terminal of the second transistor is coupled with the control terminal of the first transistor.

2. The scan driver circuit of claim 1 , wherein the corresponding one of the plurality of first clock signals has an amplitude greater than amplitudes of the corresponding M of the plurality of second clock signals.

3. The scan driver circuit of claim 1 , wherein the corresponding one of the plurality of first clock signals has a first pulse width greater than a second pulse width of the corresponding M of the plurality of second clock signals.

4. The scan driver circuit of claim 3 , wherein in a pulse duration of the corresponding one of the plurality of first clock signals, the plurality of second clock signals provide pulses of a number larger than or equal to M.

5. The scan driver circuit of claim 1 , wherein two of the corresponding N of the plurality of gate control circuits are coupled with one of the corresponding M of the plurality of gate lines, and are configured to receive one of the corresponding M of the plurality of second clock signals.

6. The scan driver circuit of claim 1 , wherein each of the plurality of stages of shift register unit comprises:
an output node, coupled with the corresponding N of the plurality of gate control circuits, and configured to provide the control signal;
a driving node;
a voltage stabilization node;
a third transistor, comprising a first terminal, a second terminal, and a control terminal, wherein a first terminal of the third transistor is configured to receive a corresponding one of the plurality of first clock signals, the second terminal of the third transistor is coupled with the output node, and the control terminal of the third transistor is coupled with the driving node;
a fourth transistor, comprising a first terminal, a second terminal, and a control terminal, wherein a first terminal of the fourth transistor is coupled with the driving node, the second terminal of the fourth transistor is configured to receive a first reference voltage, and the control terminal of the fourth transistor is coupled with the output node of a post-two stage shift register unit of the plurality of stages of shift register unit;
a voltage input circuit, configured to set the driving node and the voltage stabilization node to the first reference voltage or to set the driving node to a second reference voltage according to a voltage of the output node of a previous-two stage shift register unit of the plurality of stages of shift register unit and according to a start signal; and
a voltage stabilization circuit, configured to stabilize voltages of the driving node and the output node according to the corresponding one of the plurality of first clock signals and a voltage of the voltage stabilization node.

7. The scan driver circuit of claim 6 , wherein the voltage input circuit comprises:
a fifth transistor, comprising a first terminal, a second terminal, and a control terminal, wherein the first terminal of the fifth transistor is configured to receive the second reference voltage, the second terminal of the fifth transistor is coupled with the driving node, and the control terminal of the fifth transistor is coupled with the output node of the previous-two stage shift register unit;
a sixth transistor, comprising a first terminal, a second terminal, and a control terminal, wherein the first terminal of the sixth transistor is coupled with the driving node, the second terminal of the sixth transistor is configured to receive the first reference voltage, and the control terminal of the sixth transistor is configured to receive the start signal; and
a seventh transistor, comprising a first terminal, a second terminal, and a control terminal, wherein the first terminal of the seventh transistor is coupled with the voltage stabilization node, the second terminal of the seventh transistor is configured to receive the first reference voltage, and the control terminal of the seventh transistor is configured to receive the start signal.

8. The scan driver circuit of claim 6 , wherein the voltage stabilization circuit comprises:
an eighth transistor, comprising a first terminal, a second terminal, and a control terminal, wherein the first terminal of the eighth transistor is coupled with the output node, the second terminal of the eighth transistor is configured to receive a third reference voltage, and the control terminal of the eighth transistor is coupled with the voltage stabilization node;
a ninth transistor, comprising a first terminal, a second terminal, and a control terminal, wherein the first terminal of the ninth transistor is coupled with the driving node, the second terminal of the ninth transistor is configured to receive the first reference voltage, and the control terminal of the ninth transistor is coupled with the voltage stabilization node;
a tenth transistor, comprising a first terminal, a second terminal, and a control terminal, wherein the first terminal of the tenth transistor is coupled with the voltage stabilization node, the second terminal of the tenth transistor is configured to receive the first reference voltage, and the control terminal of the tenth transistor is coupled with the driving node; and
a capacitor, comprising a first terminal and a second terminal, wherein the first terminal of the capacitor is configured to receive the corresponding one of the plurality of first clock signals or a corresponding other of the plurality of first clock signals, the second terminal of the capacitor is coupled with the voltage stabilization node, and the corresponding one of the plurality of first clock signals and the corresponding other of the plurality of first clock signals have a s

Assignees

• Au Optronics Corp

Inventors

• Tung Che-Wei
• Lin Wei-Li
• Lin Yu-Zuo
• Chang Chia-Ming

Classifications

• 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

• G09G2300/043

  Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G2310/0267

  Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays · CPC title

• G09G2310/0286

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