IP Library › Granted Patent US 12688829
Granted Patent B2
US 12688829 · App. 19/238,356 · Granted Jul 21, 2026

Driver IC, display panel and driving method of the display panel

Inventors: Xianglin Wang (Guangzhou, CN); Kyunho Kim (Guangzhou, CN)
Assignee: GUANGZHOU CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD.
G09G3/3233G09G3/3266G09G2310/08G09G2320/0247G09G2330/027G09G2330/04
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Quick Facts
Patent No.
US 12688829
App. No.
19/238,356
Granted
Jul 21, 2026
Kind
B2
Abstract

Embodiments of the present disclosure provide a driver IC, a display panel and a driving method of the display panel. The driver IC includes a fast discharge circuit, and the fast discharge circuit includes an access port for accessing a fast discharge signal, a judgment sub-circuit, a buffer sub-circuit and a power-off sub-circuit. The judgment sub-circuit generates a judgment signal according to a target signal within a preset time in response to a falling edge of the fast discharge signal; the buffer sub-circuit generates a control signal and sends the control signal to the power-off sub-circuit in response to the judgment signal; and the power-off sub-circuit controls the driver IC to perform or not to perform a power-off operation in response to the control signal.

Claims (62)

1 . A driver IC, comprising a fast discharge circuit, wherein the fast discharge circuit comprises:

an access port, configured to access a fast discharge signal; wherein the fast discharge signal is used to indicate that the driver IC is powered off;

a sensing sub-circuit, connected to the access port and a power supply voltage, and configured to sense a falling edge of the fast discharge signal;

a buffer sub-circuit, connected to the sensing sub-circuit, a judgment sub-circuit and a power-off sub-circuit, and configured to generate a control signal and send the control signal to the power-off sub-circuit in response to a judgment signal output by the judgment sub-circuit within a preset time after the sensing sub-circuit senses the falling edge of the fast discharge signal;

the judgment sub-circuit, connected to the buffer sub-circuit, and configured to generate the judgment signal according to a state of a target signal within the preset time, and send the judgment signal to the buffer sub-circuit; and

the power-off sub-circuit, connected to the buffer sub-circuit, and configured to control the driver IC to perform or not to perform a power-off operation in response to the control signal.

2 . The driver IC according to claim 1 , wherein the judgment sub-circuit is further configured to:

generate a first judgment signal and send the first judgment signal to the buffer sub-circuit in response to a rising edge of the target signal within the preset time.

3 . The driver IC according to claim 2 , wherein the judgment sub-circuit is further configured to:

generate the first judgment signal and send the first judgment signal to the buffer sub-circuit in response to a rising edge of the fast discharge signal within the preset time; or

generate the first judgment signal and send the first judgment signal to the buffer sub-circuit in response to a rising edge of a scan driver start pulse signal within the preset time; wherein the scan driver start pulse signal is used to indicate that an image signal frame starts to be transmitted.

4 . The driver IC according to claim 2 ,

wherein the buffer sub-circuit is further configured to:

generate a first control signal and send the first control signal to the power-off sub-circuit in response to the first judgment signal within the preset time; and

the power-off sub-circuit is further configured to:

control the driver IC not to perform the power-off operation in response to the first control signal.

5 . The driver IC according to claim 1 , wherein the judgment sub-circuit is further configured to:

generate a second judgment signal and send the second judgment signal to the buffer sub-circuit in response to a continuous low-level state of the target signal within the preset time.

6 . The driver IC according to claim 5 , wherein the judgment sub-circuit is further configured to:

generate the second judgment signal and send the second judgment signal to the buffer sub-circuit in response to a continuous low-level state of the fast discharge signal within the preset time; or

generate the second judgment signal and send the second judgment signal to the buffer sub-circuit in response to a continuous low-level state of a scan driver start pulse signal within the preset time; wherein the scan driver start pulse signal is used to indicate that an image signal frame starts to be transmitted.

7 . The driver IC according to claim 5 ,

wherein the buffer sub-circuit is further configured to:

generate a second control signal and send the second control signal to the power-off sub-circuit in response to the second judgment signal within the preset time; and

the power-off sub-circuit is further configured to:

control the driver IC to perform the power-off operation in response to the second control signal.

8 . The driver IC according to claim 1 , wherein the driver IC is applicable to a China Standard Point to Point Interface transmission protocol.

9 . The driver IC according to claim 1 , wherein the fast discharge circuit further comprises:

an electrostatic protection sub-circuit, connected to the access port and the sensing sub-circuit, and configured to perform an electrostatic discharge on the driver IC.

10 . The driver IC according to claim 9 , wherein the electrostatic protection sub-circuit comprises:

a diode, comprising a positive electrode connected to a preset low potential and a negative electrode connected to the access port and the sensing sub-circuit; and

a transistor, comprising a control electrode connected to the preset low potential, a first electrode connected to the preset low potential, and a second electrode connected to the access port and the sensing sub-circuit.

11 . The driver IC according to claim 1 , wherein the power-off sub-circuit comprises:

a latch unit, configured to generate a latch signal and send the latch signal to a power-off unit in response to the control signal; and

the power-off unit, configured to perform or not to perform the power-off operation in response to the latch signal.

12 . A display panel, comprising a driver IC, and the driver IC comprising a fast discharge circuit; wherein the fast discharge circuit comprises:

an access port, configured to access a fast discharge signal; wherein the fast discharge signal is used to indicate that the driver IC is powered off;

a sensing sub-circuit, connected to the access port and a power supply voltage, and configured to sense a falling edge of the fast discharge signal;

a buffer sub-circuit, connected to the sensing sub-circuit, a judgment sub-circuit and a power-off sub-circuit, and configured to generate a control signal and send the control signal to the power-off sub-circuit in response to a judgment signal output by the judgment sub-circuit within a preset time after the sensing sub-circuit senses the falling edge of the fast discharge signal;

the judgment sub-circuit, connected to the buffer sub-circuit, and configured to generate the judgment signal according to a state of a target signal within the preset time, and send the judgment signal to the buffer sub-circuit; and

the power-off sub-circuit, connected to the buffer sub-circuit, and configured to control the driver IC to perform or not to perform a power-off operation in response to the control signal.

13 . A driving method of a display panel, applied to a driver IC, wherein the driver IC comprises a fast discharge circuit, and the fast discharge circuit comprises an access port for accessing a fast discharge signal, a judgment sub-circuit, a buffer sub-circuit and a power-off sub-circuit, and the driving method comprises:

generating, by the judgment sub-circuit, a judgment signal according to a target signal within a preset time in response to a falling edge of the fast discharge signal;

generating, by the buffer sub-circuit, a control signal and sending the control signal to the power-off sub-circuit in response to the judgment signal; and

controlling, by the power-off sub-circuit, the driver IC to perform or not to perform a power-off operation in response to the control signal.

14 . The driving method of the display panel according to claim 13 , wherein generating, by the judgment sub-circuit, the judgment signal according to the target signal within the preset time in response to the falling edge of the fast discharge signal comprises:

generating, by the judgment sub-circuit, a first judgment signal and sending the first judgment signal to the buffer sub-circuit in response to a rising edge of the target signal within the preset time.

15 . The driving method of the display panel according to claim 14 , wherein generating, by the judgment sub-circuit, the first judgment signal and sending the first judgment signal to the buffer sub-circuit in response to the rising edge of the target signal within the preset time comprises:

generating, by the judgment sub-circuit, the first judgment signal and sending the first judgment signal to the buffer sub-circuit in response to a rising edge of the fast discharge signal within the preset time; or

generating, by the judgment sub-circuit, the first judgment signal and sending the first judgment signal to the buffer sub-circuit in response to a rising edge of a scan driver start pulse signal within the preset time; wherein the scan driver start pulse signal is used to indicate that an image signal frame starts to be transmitted.

16 . The driving method of the display panel according to claim 14 , wherein the driving method further comprises:

generating, by the buffer sub-circuit, a first control signal and sending the first control signal to the power-off sub-circuit in response to the first judgment signal within the preset time; and

controlling, by the power-off sub-circuit, the driver IC not to perform the power-off operation in response to the first control signal.

17 . The driving method of the display panel according to claim 13 , wherein generating, by the judgment sub-circuit, the judgment signal according to the target signal within the preset time in response to the falling edge of the fast discharge signal comprises:

generating, by the judgment sub-circuit, a second judgment signal and sending the second judgment signal to the buffer sub-circuit in response to a continuous low-level state of the target signal within the preset time.

18 . The driving method of the display panel according to claim 17 , wherein generating, by the judgment sub-circuit, the second judgment signal and sending the second judgment signal to the buffer sub-circuit in response to the continuous low-level state of the target signal within the preset time comprises:

generating, by the judgment sub-circuit, the second judgment signal and sending the second judgment signal to the buffer sub-circuit in response to a continuous low-level state of the fast discharge signal within the preset time; or

generating, by the judgment sub-circuit, the second judgment signal and sending the second judgment signal to the buffer sub-circuit in response to a continuous low-level state of a scan driver start pulse signal within the preset time; wherein the scan driver start pulse signal is used to indicate that an image signal frame starts to be transmitted.

19 . The driving method of the display panel according to claim 17 , wherein the driving method further comprises:

generating, by the buffer sub-circuit, a second control signal and sending the second control signal to the power-off sub-circuit in response to the second judgment signal within the preset time; and

controlling, by the power-off sub-circuit, the driver IC to perform the power-off operation in response to the second control signal.

20 . The driving method of the display panel according to claim 13 , wherein the driving method is applicable to a China Standard Point to Point Interface transmission protocol.