Compensated triple gate driving circuit, a method, and a display apparatus

Patent metadata

Field	Value
Publication number	US-11217150-B2
Application number	US-201816485994-A
Country	US
Kind code	B2
Filing date	Sep 6, 2018
Priority date	Sep 6, 2018
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

The present application discloses a gate driver on array (GOA) circuit of a display panel. The GOA circuit includes a first GOA unit comprising a unit-circuitry structure having a pull-up node commonly coupled to three output transistors to control outputting of a first set of three gate-driving signals respectively to a first set of three gate lines associated with the display panel. The GOA circuit additionally includes a second GOA unit comprising a substantially same unit-circuitry structure cascaded with the first GOA unit and configured to control outputting a second set of three gate-driving signals respectively to a second set of three gate lines associated with the display panel. Moreover, the GOA circuit includes a capacitor connected from one in the second set of three output terminals of the second GOA unit to the pull-up node of the first GOA unit.

First claim

What is claimed is:

1. A gate driver on array (GOA) circuit of a display panel comprising:
a first GOA unit having a unit-circuitry structure including a pull-up node commonly coupled to three or more output transistors to control outputting of a first set of three or more gate-driving signals respectively to a first set of three or more output terminals respectively connected to a first set of three or more gate lines associated with the display panel;
a second GOA unit comprising a substantially same unit-circuitry structure cascaded with the first GOA unit and configured to control outputting a second set of three or more gate-driving signals respectively to a second set of three or more output terminals respectively connected to a second set of three or more gate lines associated with the display panel; and
a capacitor connected from one in the second set of three output terminals of the second GOA unit to the pull-up node of the first GOA unit.

2. The GOA circuit of claim 1 , wherein the unit-circuitry structure comprises a plurality of transistors configured to charge the pull-up node to a first voltage level, the plurality of transistors includes the three or more output transistors having respective three or more gate electrodes commonly coupled to the pull-up node and three or more drain electrodes being respectively provided with a first set of three or more clock signals substantially at a same time of the pull-up node being charged to the first voltage level, the first voltage level being sufficiently high to allow the first set of three or more clock signals to be passed respectively to three or more source electrodes of the three or more output transistors.

3. The GOA circuit of claim 2 , wherein the first set of three or more clock signals includes a first clock signal having a first pulse rising edge and a first pulse falling edge, a second clock signal having a second pulse rising edge rising simultaneously as the first pulse rising edge and a second pulse falling edge at a time after the first pulse falling edge by a first delay time, and a third clock signal having a third pulse rising edge rising simultaneously as the first pulse rising edge and a third pulse falling edge at a time after the second pulse falling edge by a second delay time.

4. The GOA circuit of claim 3 , wherein the three or more source electrodes of the three or more output transistors are respectively connected to the first set of three or more output terminals to output the first set of three or more clock signals as the first set of three or more gate-driving signals.

5. The GOA circuit of claim 3 , wherein the first voltage level at the pull-up node is dropped to a second voltage level at a time of the first pulse falling edge when the first clock signal applied to a first one of the three or more output transistors is off and is further dropped to a third voltage level at a time of the second pulse falling edge when the second clock signal applied to a second one of the three or more output transistors is off and is again dropped to a fourth voltage level at a time of the third pulse falling edge when the third clock signal applied to a third one of the three or more output transistors is off.

6. The GOA circuit of claim 5 , wherein the pull-up node is applied with a compensation signal coupled from one of the second set of three or more gate-driving signals via the capacitor connected from one in the second set of three or more output terminals of the second GOA unit, the compensation signal comprising a push-up pulse rising edge occurred at substantially same time as the first pulse falling edge to push up the second voltage level higher for maintaining the remaining ones of the three or more output transistors of the first GOA unit at an ON state during the first delay time and reducing a discharge time of the first one of the three or more output transistors from the ON state to an OFF state.

7. The GOA circuit of claim 6 , wherein the third voltage level is subsequently pushed higher due to the second voltage level being pushed higher for maintaining remaining ones of the three or more output transistors at the on state during the second delay time and reducing a discharge time for the second one of the three or more output transistors from the ON state to an OFF state; the fourth voltage level is subsequently pushed higher due to the second voltage level being pushed higher for reducing a discharge time for the third one of the three or more output transistors from the ON state to an OFF state.

8. The GOA circuit of claim 6 , wherein the second GOA unit is configured to receive a second set of three or more clock signals substantially at a same time of the push-up pulse rising edge, the second set of three or more clock signals respectively being applied to three or more drain electrodes of three or more output transistors of the second GOA unit to output as the second set of three or more gate-driving signals to the second set of three or more output terminals.

9. The GOA circuit of claim 8 , wherein the compensation signal is coupled from the one of the second set of three or more gate-driving signals originated from a first one of second set of three or more clock signals having a pulse rising edge being the push-up pulse rising edge.

10. The GOA circuit of claim 1 , wherein the second GOA unit is one subsequently next to the first GOA unit.

11. The GOA circuit of claim 1 , wherein the second GOA unit is one beyond a subsequently next one to the first GOA unit.

12. A display apparatus comprising a display panel and a GOA circuit of any one of claims 1 to 11 .

13. A method of driving a gate driver on array (GOA) circuit of a display panel,
wherein the GOA circuit comprises:
a first GOA unit comprising a unit-circuitry structure having a pull-up node commonly coupled to three or more output transistors to control outputting of a first set of three or more gate-driving signals to a first set of three or more output terminals connected to a first set of three or more gate lines associated with the display panel;
a second GOA unit comprising a substantially same unit-circuitry structure configured to control outputting of a second set of three or more gate-driving signals to a second set of three or more output terminals connected to a second set of three or more gate lines associated with the display panel; and
a capacitor connected between one of the second set of three or more output terminals of the second GOA unit and the pull-up node of the first GOA unit;
the method comprising:
transferring a compensation signal to the pull-up node of the first GOA unit via the capacitor from one in the second set of three or more output terminals of the second GOA unit.

14. The method of claim 13 , further comprising: respectively applying a first set of three or more clock signals simultaneously to three or more drain electrodes of the three or more output transistors, thereby bootstrapping the pull-up node to a first voltage level.

15. The method of claim 14 , wherein the first set of three or more clock signals include a first clock signal having a first pulse rising edge and a first pulse falling edge, a second clock signal having a second pulse rising edge rising simultaneously as the first pulse rising edge and a second pulse falling edge at a time after the first pulse falling edge by a first delay time, and a third clock signal having a third pulse rising edge rising simultaneously as the first pulse rising edge and a third pulse falling edge at a time after the second pulse falling edge by a second delay time.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Han Mingfu
• Shang Guangliang
• Yao Xing
• Zheng Haoliang

Classifications

• G09G2310/0286

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

• G09G2310/0267

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

• G09G2300/0408

  Integration of the drivers onto the display substrate · CPC title

• G09G3/3674

  Details of drivers for scan electrodes · CPC title

• G09G3/3266 Primary

  Details of drivers for scan electrodes · CPC title