CN-121982999-A - GDL circuit, driving method, display panel and display device

CN121982999ACN 121982999 ACN121982999 ACN 121982999ACN-121982999-A

Abstract

The application relates to a GDL circuit, a driving method, a display panel and display equipment, wherein the GDL circuit comprises a grid driving module, a double-denoising tube module and a bias control module, wherein the grid driving module is used for accessing a scanning driving signal and enabling a current pixel row to display a current frame picture under the driving of the scanning driving signal, the double-denoising tube module is connected with the grid driving module and is used for accessing a denoising signal to denoise the grid driving module when the current frame picture is in a display stage, the denoising tube in the double-denoising tube module is in a first bias state in the display stage, and the bias control module is connected with the double-denoising tube module and is used for accessing a bias control signal when the current frame picture is in a blank stage so as to control the denoising tube in the double-denoising tube module to be in a second bias state. The circuit solves the technical problem that IV characteristics of a double noise elimination tube of a GDL circuit cannot be restrained from moving right in the prior art.

Inventors

CHENG JINSUO
LIN JINGNAN
Gong Xingzhen
YE LIDAN

Assignees

惠科股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260409

Claims (10)

1. A GDL circuit, the GDL circuit comprising: The grid driving module is used for accessing a scanning driving signal and enabling the current pixel row to display a current frame picture under the driving of the scanning driving signal; the double-denoising tube module is connected with the grid driving module and is used for switching in a denoising signal to denoise the grid driving module when the current frame picture is in a display stage, wherein a denoising tube in the double-denoising tube module is in a first bias state in the display stage; The bias control module is connected with the double-noise-eliminating-tube module and is used for accessing a bias control signal when the current frame picture is in a blank stage so as to control the noise eliminating tube in the double-noise-eliminating-tube module to be in a second bias state, wherein the bias direction of the second bias state is opposite to that of the first bias state.
2. The GDL circuit of claim 1 wherein the gate drive module includes a denoising control unit, the controlled end of the dual denoising tube module is connected to the denoising control unit, and the connection node is a first node, the bias control module comprising: The first signal end is connected with the first end of the double noise elimination tube module; The denoising control unit is used for outputting a low-level signal to the first node when the current frame picture is in the blank stage, so that the double denoising tube module is closed; The first signal end is used for accessing a high-level signal when the current frame picture is in the blank stage so as to control the double-noise elimination pipe module to be in a negative bias state.
3. The GDL circuit of claim 1, wherein the bias control module comprises: The energy storage device comprises a first switch unit, an energy storage unit, a second signal end and a third signal end, wherein the first end of the first switch unit is connected with the first end of the double-noise-elimination tube module, the second end of the first switch unit is connected with the second signal end, a first controlled end of the first switch unit is connected with the second signal end, a first containing end of the energy storage unit is connected with the first end of the double-noise-elimination tube module, and a second containing end of the energy storage unit is connected with the third signal end; The first switch unit is used for being started when the first controlled end is connected with the high-level signal, so that the second signal end charges the first end of the energy storage unit, the second signal end is used for being connected with the low-level signal when the current frame picture is in the second blank sub-stage, the first switch unit is used for being closed when the current frame picture is in the first controlled end is connected with the low-level signal, the third signal end is used for being connected with the high-level signal when the current frame picture is in the second blank sub-stage, and the energy storage unit is used for conducting charge conservation adjustment on the voltage of the first end of the energy storage unit when the second end is connected with the high-level signal so as to control the dual-pipe noise module to be in a negative bias state.
4. The GDL circuit of claim 3 wherein the bias control module includes a fourth signal terminal to which the second controlled terminal of the first switching unit is connected; The fourth signal end is used for accessing a high-level signal when the current frame picture is in the display stage, the second signal end is used for accessing a low-level signal when the current frame picture is in the display stage, and the first switch unit is used for being started when the second controlled end is accessed to the high-level signal, so that the second signal end outputs the low-level signal to the first end of the double-noise-elimination tube module; the fourth signal end is used for accessing a low-level signal when the current frame picture is in the blank stage.
5. The GDL circuit of claim 4 wherein the gate drive module includes a denoising control unit, the controlled end of the dual denoising tube module is connected to the denoising control unit, and the connection node is a first node, wherein the denoising control unit is configured to output a low level signal to the first node when the current frame is in the blank phase, so that the dual denoising tube module is turned off.
6. The GDL circuit of claim 4, wherein the gate drive module includes a pre-charge unit, an output unit, and a denoising control unit, the pre-charge unit is connected to a controlled end of the output unit, the connection node is a second node, one of the dual-denoising transistor modules is an eighth thin film transistor, the other of the dual-denoising transistor modules is a ninth thin film transistor, a first end of the eighth thin film transistor is connected to a first end of the ninth thin film transistor, the first end of the dual-denoising transistor module is configured, the controlled end of the eighth thin film transistor is connected to a controlled end of the ninth thin film transistor, and the connection node is a first node, the bias control module includes: The second switch unit and the third switch unit are connected with the fourth signal end, the first end of the second switch unit is connected with the second end of the eighth thin film transistor, the second end of the second switch unit is connected with the second node, the first end of the third switch unit is connected with the second end of the ninth thin film transistor, and the second end of the third switch unit is connected with the output end of the output unit; the denoising control unit is used for outputting a high-level signal to a first node when the current frame picture is in the blank stage, so that the double denoising tube module is started.
7. The GDL circuit of claim 4, wherein the first switching cell is a double-gate thin film transistor, a positive gate of the double-gate thin film transistor is a first controlled terminal of the first switching cell, and a back gate of the double-gate thin film transistor is a second controlled terminal of the first switching cell.
8. A driving method of the GDL circuit, wherein the driving method of the GDL circuit is applied to the GDL circuit of any one of claims 1 to 6, the method comprising: the grid driving module is connected with a grid driving signal, and the current pixel row is enabled to display a current frame picture under the driving of the grid driving signal; When the current frame picture is in a display stage, denoising the grid driving module by accessing a denoising signal through the double denoising tube module, wherein a denoising tube in the double denoising tube module is in a first bias state in the display stage; When the current frame picture is in a blank stage, a bias control signal is accessed through the bias control module to control a noise elimination tube in the double noise elimination tube module to be in a second bias state, wherein the bias direction of the second bias state is opposite to that of the first bias state.
9. A display panel, characterized in that it comprises a color film substrate, a liquid crystal layer and an array substrate, the liquid crystal layer being arranged between the array substrate and the color film substrate, the array substrate comprising the GDL circuit according to any one of claims 1 to 7.
10. A display device comprising the display panel of claim 9, a memory, a processor, and a driver of the GDL circuit stored on the memory and operable on the processor, the processor implementing the steps of the method of driving the GDL circuit of claim 8 when executing the driver of the GDL circuit.

Description

GDL circuit, driving method, display panel and display device Technical Field The present application relates to the field of display technologies, and in particular, to a GDL circuit, a driving method, a display panel, and a display device. Background With the continuous development of display technology, LCD (LiquidCrystalDisplay ) products are widely used in many fields such as mobile phones, vehicles, central control, smart home, smart office, watches, and bracelets. However, during the screen display process, the dual noise cancellation tube set by the existing LCD design is in a forward bias operating state of 28V most of the time (about 88%), so that the IV (Current-Voltage) characteristic of the dual noise cancellation tube is shifted to the right, especially in a high temperature and high humidity environment, the speed of shifting the IV characteristic of the dual noise cancellation tube to the right can be accelerated by long-time operation, which results in the decrease of the turn-on capability and the noise control capability of the dual noise cancellation tube, and further increases the risk that the GDL (GATEDRIVERLESS, less gate driver technology) circuit is interfered by a signal source to generate noise, thereby causing the GDL circuit to possibly generate an unstable or abnormal output signal, and finally causing serious influence on the overall display performance of the LCD product. Therefore, how to suppress the right shift of the IV characteristics of the dual noise canceling tube of the GDL circuit to improve the display performance of the LCD product is a technical problem to be solved. Disclosure of Invention The application provides a GDL circuit, a driving method, a display panel and display equipment, which are used for solving the technical problem that IV characteristics of a double noise elimination tube of the GDL circuit cannot be restrained from moving right in the prior art. The application provides a GDL circuit, which comprises a grid driving module, a double-noise-elimination-tube module and a bias control module, wherein the grid driving module is used for accessing a scanning driving signal and enabling a current pixel row to display a current frame picture under the driving of the scanning driving signal, the double-noise-elimination-tube module is connected with the grid driving module and used for accessing a noise elimination signal to conduct noise elimination processing on the grid driving module when the current frame picture is in a display stage, the noise elimination tube in the double-noise-elimination-tube module is in a first bias state in the display stage, the bias control module is connected with the double-noise-elimination-tube module and used for accessing a bias control signal when the current frame picture is in a blank stage so as to control a noise elimination tube in the double-noise-elimination-tube module to be in a second bias state, and the second bias state is opposite to the bias direction of the first bias state. The grid driving module comprises a denoising control unit, wherein a controlled end of the double-denoising tube module is connected with the denoising control unit, a connecting node is a first node, the bias control module comprises a first signal end, the first signal end is connected with the first end of the double-denoising tube module, the denoising control unit is used for outputting a low-level signal to the first node when the current frame picture is in the blank stage so as to enable the double-denoising tube module to be closed, and the first signal end is used for accessing a high-level signal when the current frame picture is in the blank stage so as to control the double-denoising tube module to be in a negative bias state. The bias control module comprises a first switch unit, an energy storage unit, a second signal end and a third signal end, wherein the first end of the first switch unit is connected with the first end of the double-noise elimination tube module, the second end of the first switch unit is connected with the second signal end, a first controlled end of the first switch unit is connected with the second signal end, the first containing end of the energy storage unit is connected with the first end of the double-noise elimination tube module, the second containing end of the energy storage unit is connected with the third signal end, the blank stage is composed of a first blank sub-stage and a second blank sub-stage, the third signal end is used for switching in a low-level signal when the current frame is in the first blank sub-stage, the first switch unit is used for switching in a high-level signal when the first controlled end is connected with the high-level signal end, the second signal end is enabled to be connected with the energy storage unit, the second containing end of the energy storage unit is connected with the third signal end, the blank stage is composed of a first blank sub-s