CN-121982983-A - Gate driving circuit, partial brushing control method and display panel

Abstract

The application belongs to the technical field of display driving, and particularly relates to a grid driving circuit, a local brushing control method and a display panel, which comprise N cascaded grid driving modules, wherein an nth-stage grid driving module comprises a pre-charging unit, a local brushing control unit and an output unit, wherein the pre-charging unit is configured to pre-charge a driving control node, the local brushing control unit is configured to pre-store local brushing trigger voltage in a full scanning frame in a local refreshing mode, the driving control node is pre-charged in response to the local brushing trigger voltage in a refreshing initial line of the local brushing frame in the local refreshing mode, and the output unit is configured to output a level transmission signal and a grid driving signal of a current stage under the control of voltage on the driving control node.

Inventors

• LAN TIAN
• XU PEI

Assignees

• 惠科股份有限公司

Dates

Publication Date

20260505

Application Date

20260408

Claims (10)

1. 1. A gate driving circuit comprising N cascaded gate driving modules, wherein an nth stage gate driving module comprises: The precharge unit is connected with the driving control node of the current stage and is configured to precharge the driving control node through the level transmission signal of the n-j level grid driving module in the global refreshing mode; The local brushing control unit is connected with the driving control node and is configured to pre-store a local brushing trigger voltage in a full-scanning frame in a local refreshing mode, respond to the local brushing trigger voltage and pre-charge the driving control node in a refreshing initial line of the local brushing frame in the local refreshing mode, wherein the full-scanning frame is the last frame of the local brushing frame; and the output unit is connected with the drive control node and is configured to output the current-stage cascade signal and the gate drive signal under the control of the voltage on the drive control node.
2. 2. The gate driving circuit according to claim 1, wherein the partial brush control unit includes: a pre-storing control subunit, connected with the voltage pre-storing node of the current stage and the first control signal end, configured to respond to the effective level output by the first control signal end in the full scan frame, and form and maintain a pre-storing voltage on the voltage pre-storing node; The local brush trigger subunit is connected with the voltage pre-storing node, the second control signal end and the local brush trigger node of the current stage and is configured to form and maintain the local brush trigger voltage on the local brush trigger node in a frame crossing manner in response to the pre-storing voltage on the voltage pre-storing node and the effective level output by the second control signal end in the full scanning frame; And the local brushing execution subunit is connected with the local brushing trigger node and the driving control node and is configured to respond to the local brushing trigger voltage to precharge the driving control node at the refreshing starting line of the local brushing frame.
3. 3. The gate drive circuit of claim 2, wherein the pre-stored control subunit comprises: The control end of the first transistor is connected with the first control signal end, the first end of the first transistor is connected with the level transmission output end of the n-j level grid driving module, and the second end of the first transistor is connected with the voltage pre-storing node; and the first end of the first capacitor is connected with the voltage pre-storing node, and the second end of the first capacitor is connected with the low level end.
4. 4. The gate drive circuit of claim 2, wherein the partial brush trigger subunit comprises: The control end of the second transistor is connected with the voltage pre-storing node, the first end of the second transistor is connected with the second control signal end, and the second end of the second transistor is connected with the middle control node; A third transistor, a control end of which is connected to the intermediate control node, a first end of which is connected to a clock signal line of a current stage, and a second end of which is connected to the local brush trigger node; and the first end of the second capacitor is connected with the local brush trigger node, and the second end of the second capacitor is connected with the low level end.
5. 5. The gate drive circuit of claim 4, wherein the partial brush trigger subunit further comprises: And the control end of the reset transistor is connected with the frame start signal line, the first end of the reset transistor is connected with the local brush trigger node, and the second end of the reset transistor is connected with the low level end.
6. 6. The gate drive circuit of claim 2, wherein the partial brush execution subunit comprises: The control end of the fourth transistor is connected with the local brush trigger node, and the first end of the fourth transistor is connected with the drive control node; And the control end of the fifth transistor is connected with the first control signal end, the first end of the fifth transistor is connected with the second end of the fourth transistor, and the first end of the fifth transistor is connected with the control end of the fifth transistor.
7. 7. A partial brushing control method, applied to the gate driving circuit according to any one of claims 1 to 6, comprising: forming and maintaining a local brushing trigger voltage on a local brushing trigger node of a preset row in a full scanning frame in a local refreshing mode, wherein the preset row is a refreshing starting row of the local brushing frame; and pre-charging a drive control node of the current stage according to the local brushing trigger voltage in a preset row of the local brushing frame in the local refreshing mode, so that the preset row outputs a hierarchical transmission signal and a grid drive signal under the control of the voltage on the drive control node.
8. 8. The partial brush control method according to claim 7, wherein forming and maintaining a partial brush trigger voltage on a partial brush trigger node of a predetermined row in a full scan frame in the partial refresh mode, comprises: In a scanning period of the full scanning frame, enabling a first control signal to be an active level in a pre-charging period of the preset row so as to form and maintain a pre-stored voltage on a voltage pre-storing node of the preset row; and in the blanking period of the full scanning frame, enabling a second control signal to be in an effective level, enabling a clock signal end of the preset line to output effective pulse, and forming and maintaining the local brushing trigger voltage on a local brushing trigger node of the preset line in a frame-crossing manner according to the pre-stored voltage maintained on the voltage pre-stored node.
9. 9. The partial refresh control method of claim 7, wherein precharging the drive control node of the current stage according to the partial refresh trigger voltage at a predetermined row of the partial refresh frame, comprising: When the partial brushing frame starts, the first control signal is enabled to be at an active level; And responding to the local brushing trigger voltage which is maintained across frames on the local brushing trigger node, enabling the first control signal to be coupled to the driving control nodes of the preset row through a conduction path, and precharging the driving control nodes.
10. 10. A display panel comprising a display area and a non-display area, the display area comprising a plurality of scan lines, wherein the non-display area comprises the gate drive circuit of any one of claims 1-6, and wherein a drive output of the gate drive circuit is electrically connected to at least one of the scan lines.

Description

Gate driving circuit, partial brushing control method and display panel Technical Field The disclosure belongs to the technical field of display driving, and particularly relates to a gate driving circuit, a local brush control method and a display panel. Background With the increasing demands of display devices for large size, high resolution and low power consumption, progressive scanning using GOA (GATE DRIVER on Array) technology has become a mainstream driving method. In order to reduce the power consumption of the display device, a display mode of partial refresh is proposed, namely, only scanning is performed in a picture update area instead of refreshing the whole screen, thereby remarkably reducing the power consumption of GOA and driving IC. However, in the GOA circuit of the current local refresh, under the multi-CK architecture, due to the longer time sequence overlapping area between adjacent stage signals, erroneous output is usually generated at the edge of the refresh area, resulting in abnormal display, and the reliability of the local refresh is reduced. Therefore, how to improve the false output of the local refresh edge position is a current urgent problem to be solved. Disclosure of Invention The embodiment of the application provides a grid driving circuit, a local brushing control method and a display panel, wherein a local brushing control unit is arranged between a pre-charging unit and a driving output unit, and a driving control node is independently pre-charged in response to a trigger voltage at a refresh starting line of a follow-up local brushing frame according to a local brushing trigger voltage corresponding to the refresh starting line in a full scanning frame, so that the refresh starting line of the local brushing frame can independently start scanning without depending on a pre-stage signal, and the problem of error output of a local refreshing edge position is solved. The application provides a grid driving circuit, which comprises N cascaded grid driving modules, an nth-stage grid driving module, a local brushing control unit and an output unit, wherein the N-stage grid driving module comprises a pre-charging unit and a local brushing control unit, the pre-charging unit is connected with a driving control node of the current stage and is configured to pre-charge the driving control node through a level transmission signal of the nth-j-stage grid driving module in a global refreshing mode, the local brushing control unit is connected with the driving control node and is configured to pre-store a local brushing trigger voltage in a full-scanning frame in a local refreshing mode, the refreshing starting line of the local brushing frame in the local refreshing mode is used for pre-charging the driving control node in response to the local brushing trigger voltage, the full-scanning frame is the last frame of the local brushing frame, and the output unit is connected with the driving control node and is configured to output the level transmission signal of the current stage and the grid driving signal under the voltage control of the driving control node. The local brushing control unit comprises a pre-storing control subunit, a local brushing trigger subunit and a local brushing execution subunit, wherein the pre-storing control subunit is connected with a current-stage voltage pre-storing node and a first control signal end and is configured to form and keep pre-storing voltage on the voltage pre-storing node in response to an effective level output by the first control signal end in a full-scanning frame, the local brushing trigger subunit is connected with the voltage pre-storing node, a second control signal end and a current-stage local brushing trigger node and is configured to form and keep the local brushing trigger voltage on the local brushing trigger node in response to the pre-storing voltage on the voltage pre-storing node and the effective level output by the second control signal end in the full-scanning frame, and the local brushing execution subunit is connected with the local brushing trigger node and the driving control node and is configured to pre-charge the driving control node in response to the local brushing trigger voltage at a refresh starting line of the local brushing frame. Optionally, the pre-storing control subunit comprises a first transistor, a first capacitor and a low-level end, wherein the control end of the first transistor is connected with the first control signal end, the first end of the first transistor is connected with the level transmission output end of the n-j-th level grid driving module, the second end of the first transistor is connected with the voltage pre-storing node, and the first end of the first capacitor is connected with the voltage pre-storing node. Optionally, the local brush trigger subunit comprises a second transistor, a third transistor and a second capacitor, wherein the control end of the second transisto