CN-121982985-A - Gate driving circuit, partial brushing control method and display panel

CN121982985ACN 121982985 ACN121982985 ACN 121982985ACN-121982985-A

Abstract

The application belongs to the technical field of display driving, and particularly relates to a gate driving circuit, a local brushing control method and a display panel, wherein an nth-stage gate driving module comprises a pre-charging unit, a local brushing control unit and an output unit, wherein the local brushing control unit is used for responding to a first control signal output by a first control signal end in a full-scan frame in a local refreshing mode to form and keep local brushing pre-stored voltage on a voltage pre-storing node, and a refreshing initial line of the local brushing frame in the local refreshing mode is used for pre-charging a driving control node according to the timing sequence coordination of the local brushing pre-stored voltage, a second control signal output by a second control signal end and a third control signal output by a third control signal end.

Inventors

LAN TIAN
XU PEI

Assignees

惠科股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260408

Claims (10)

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, the first control signal end, the second control signal end and the third control signal end and is configured to respond to a first control signal output by the first control signal end in a full scanning frame in a local refreshing mode to form and maintain a local brushing pre-stored voltage on a voltage pre-storing node; the method comprises the steps of pre-charging a driving control node according to the timing sequence coordination of a local brushing pre-stored voltage, a second control signal output by a second control signal end and a third control signal output by a third control signal end at a refreshing start line of a local brushing frame in a 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. The gate driving circuit according to claim 1, wherein the partial brush control unit includes: A pre-storing control subunit, connected with the first control signal end and the voltage pre-storing node of the current stage, configured to form and maintain a local brushing pre-storing voltage on the voltage pre-storing node in response to the effective level output by the first control signal end in the full scanning frame; A trigger enhancer unit connected to the voltage pre-storing node, the second control signal terminal and the voltage enhancing node and configured to generate an enhancing voltage on the voltage enhancing node by capacitive coupling according to the local brushing pre-stored voltage in response to the second control signal in the local brushing frame; and the local brushing execution subunit is connected with the voltage enhancement node, the third control signal end and the driving control node and is configured to respond to the third control signal in the local brushing frame and precharge the driving control node according to the enhancement voltage.
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 current level, and the second end of the first transistor is connected with the voltage pre-storing node; 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 intermediate control node.
4. The gate drive circuit of claim 2, wherein the trigger enhancer unit 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 terminal of which is connected to the intermediate control node, a first terminal of which is connected to a first terminal of the second transistor, and a second terminal of which is connected to the voltage-boosting node; and the first end of the second capacitor is connected with the voltage enhancement node, and the second end of the second capacitor is connected with the driving control node.
5. The gate drive circuit of claim 2, wherein the partial brush execution subunit comprises: and the control end of the fourth transistor is connected with the third control signal end, the first end of the fourth transistor is connected with the voltage enhancement node, and the second end of the fourth transistor is connected with the driving control node.
6. The gate drive circuit of claim 3, wherein the pre-stored control subunit further comprises: a fifth transistor, a control end of which is connected with the first control signal end, a first end of which is connected with the level transmission output end of the current level, and a second end of which is connected with the first end of the first transistor; and the first end of the third capacitor is connected with the second end of the fifth transistor, and the second end of the third capacitor is connected with the low level end.
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 pre-stored voltage on a voltage pre-stored node of a preset row in a full scanning frame in a local refreshing mode in response to a first control signal, wherein the preset row is a refreshing starting row of the local brushing frame; And pre-charging a driving control node of the current stage through a capacitive coupling network according to the pre-stored voltage of the local brush and the time sequence coordination of the second control signal and the third control signal, so that the pre-set row outputs a level transmission signal and a grid driving signal under the control of the voltage on the driving control node.
8. The partial brushing control method according to claim 7, wherein the forming and maintaining the partial brushing pre-stored voltage on the voltage pre-stored node of the predetermined row in the full scan frame in the partial refresh mode comprises: In the scanning stage of the full scanning frame, the first control signal is enabled to be at an active level in the pre-charging period of the preset row so as to couple the level signaling signal of the current level to the voltage pre-storing node of the preset row, and the local brushing pre-storing voltage is formed and maintained on the voltage pre-storing node.
9. The method according to claim 7, wherein the precharging the current stage of the driving control node through the capacitive coupling network according to the partial refresh mode of the predetermined row of the partial refresh frame and the timing coordination of the partial refresh pre-stored voltage and the second control signal and the third control signal comprises: When the preset time is reached in the local brushing frame, enabling a second control signal to be in an effective level, and generating a boosting voltage on a voltage boosting node according to the local brushing pre-stored voltage maintained on the voltage pre-stored node; and during the period when the second control signal is active, enabling a third control signal to be at an active level, and precharging the driving control node through capacitive coupling according to the enhancement voltage on the voltage enhancement node.
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, so that cross-frame memory and accurate triggering of a refreshing initial position are realized, a refreshing initial line of a local brushing frame can independently start scanning without depending on a pre-stage signaling, and the problem of false output of a local refreshing edge position is solved. The application provides a grid driving circuit, which comprises N cascaded grid driving modules, wherein the nth-stage grid driving module comprises a pre-charging unit which is connected with a driving control node of a 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, a local brushing control unit which is connected with the driving control node, a first control signal end, a second control signal end and a third control signal end and is configured to form and keep a local brushing pre-stored voltage on a voltage pre-stored node in a full scanning frame in the local refreshing mode in response to the first control signal outputted by the first control signal end, and a local brushing starting line in the local refreshing mode and pre-charges the driving control node according to the time sequence coordination of the local brushing voltage, the second control signal outputted by the second control signal end and the third control signal end, wherein the full scanning frame is a pre-stored frame of the first brushing frame, the local brushing control unit is connected with the driving control node in the upper stage and the current stage, and the current stage is configured to output the driving control signal. The local brushing control unit comprises a pre-storing control subunit, a triggering enhancer unit and a local brushing execution subunit, wherein the pre-storing control subunit is connected with the first control signal end and a current-stage voltage pre-storing node and is configured to form and maintain a local brushing pre-storing voltage on the voltage pre-storing node in response to an effective level output by the first control signal end in the full scanning frame, the triggering enhancer unit is connected with the voltage pre-storing node, the second control signal end and a voltage enhancing node and is configured to generate an enhancing voltage on the voltage enhancing node through capacitive coupling according to the local brushing pre-storing voltage in response to the second control signal in the local brushing frame, and the local brushing execution subunit is connected with the voltage enhancing node, the third control signal end and the driving control node and is configured to pre-charge the driving control node according to the enhancing voltage in response to the third control signal in the local brushing frame. Optionally, the pre-storing control subunit comprises a first transistor, a first capacitor and a first capacitor, 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 current level, the second end of the first transistor is connected with the voltage pre-storing node, 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 middle control node. Optionally, the triggering enhancement subunit comprises a second transistor, a third transistor and a second capacitor, wherein the control end