CN-122024665-A - Display panel driving method, driving circuit and display device

CN122024665ACN 122024665 ACN122024665 ACN 122024665ACN-122024665-A

Abstract

The application discloses a display panel driving method, a driving circuit and a display device, and relates to the technical field of display; the display panel driving method comprises the steps of detecting whether a display panel performs positive and negative polarity switching in a current row, detecting whether a charge sharing function is started or not, if not, continuously detecting whether the positive and negative polarity switching is performed until the current row is finished, adjusting and shortening charge sharing time if the charge sharing function is started, continuously detecting whether the charge sharing function is started until the current row is finished if the charge sharing function is not started, entering the next row after the current row is finished, and repeating the steps until the display panel stops displaying.

Inventors

CHEN JIE
LI JIEWEI

Assignees

惠科股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260319

Claims (10)

1. A display panel driving method, characterized by comprising the steps of: in the current row, detecting whether the display panel performs positive and negative polarity switching; if yes, detecting whether to start the charge sharing function, if not, continuously detecting whether to switch positive and negative polarities until the current line is ended; If the charge sharing function is started, adjusting and shortening the charge sharing time, and if the charge sharing function is not started, continuously detecting whether the charge sharing function is started or not until the current line is ended; And (3) ending the current row, entering the next row, and repeating the steps until the display panel stops displaying.
2. The method of claim 1, wherein the step of adjusting the charge sharing time if the charge sharing function is turned on, and continuously detecting whether the charge sharing function is turned on until the current row is completed if the charge sharing function is not turned on comprises: When the charge sharing function is detected to be entered, the short-circuit control switch is conducted so that the positive polarity voltage input end and the negative polarity voltage output end are conducted mutually; The turn-off time of the control switch of the control short circuit is advanced before the falling edge of the source output enable signal; When detecting that the charge sharing function is not entered, continuously detecting whether the charge sharing function is started or not until the current row is ended; the short circuit control switch is used for conducting two adjacent data lines with opposite driving polarities to balance positive polarity voltage and negative polarity voltage.
3. The display panel driving method according to claim 2, wherein an on time of the short circuit control switch is later than a rising edge of the source output enable signal, and an off time of the short circuit control switch is earlier than a falling edge of the source output enable signal.
4. The display panel driving method according to claim 1, wherein the step of detecting whether the display panel is switched in positive and negative polarities in the current row comprises: Detecting a polarity switching signal of the display panel; and judging whether the display panel performs positive and negative polarity switching according to the level change of the polarity switching signal.
5. The display panel driving method according to claim 3, wherein the turn-off time of the short control switch is at least 4ns earlier than the falling edge of the source output enable signal.
6. The method of claim 1, wherein if yes, detecting whether to turn on the charge sharing function, if no, continuing to detect whether to switch the positive and negative polarities until the current line is finished comprises: When the display panel is detected to switch positive and negative polarities, detecting whether a short circuit control switch is turned on; if the short circuit control switch is turned on, judging that the charge sharing function is started; if the short circuit control switch is not conducted, judging that the charge sharing function is not started, and continuously detecting whether the short circuit control switch is conducted or not until the current line is ended; And when the display panel is detected not to be switched in positive and negative polarities, continuously detecting whether the display panel is switched in positive and negative polarities or not until the current line is ended.
7. The display panel driving method according to claim 2, wherein the step of controlling the turn-off time of the short control switch to be earlier than the falling edge of the source output enable signal comprises: Detecting the using time of the display panel; Judging the aging degree of the display panel according to the detection result; and dynamically adjusting the conduction time of the short circuit control switch according to the aging degree of the display panel.
8. A driving circuit applied to a display panel, comprising: a positive voltage input terminal for inputting a positive voltage; a negative voltage input terminal for inputting a negative voltage; the positive voltage input end of the first control switch set is connected with the input end of the first control switch set, and two output ends of the first control switch set are arranged; The negative polarity voltage input end is connected with the input end of the second control switch set, and two output ends of the second control switch set are arranged; The short-circuit control switch is arranged between the output end of the first control switch set and the output end of the second control switch set; the first data output end and the second data output end are respectively connected with the first data output end and the second data output end, and the two output ends of the second control switch set are respectively connected with the first data output end and the second data output end; The first data output end and the second data output end are connected, when the charge sharing function of the display panel is started, the short circuit control switch is turned on, and when the charge sharing function of the display panel is stopped, the short circuit control switch is turned off, and the first data output end and the second data output end are turned off.
9. The drive circuit according to claim 8, wherein the first control switch set includes a first thin film transistor and a third thin film transistor, the second control switch set includes a second thin film transistor and a fourth thin film transistor, input terminals of the first thin film transistor and the third thin film transistor are connected to the positive polarity voltage input terminal, output terminals of the first thin film transistor are connected to a first data output terminal, output terminals of the third thin film transistor are connected to the second data output terminal, input terminals of the second thin film transistor and the fourth thin film transistor are connected to the negative polarity voltage input terminal, output terminals of the second thin film transistor are connected to a second data output terminal, and output terminals of the fourth thin film transistor are connected to the first data output terminal; The first thin film transistor and the second thin film transistor are turned on, the third thin film transistor and the fourth thin film transistor are turned off, and the third thin film transistor and the fourth thin film transistor are turned on when the first thin film transistor and the second thin film transistor are turned off.
10. A display device comprising a display panel and the drive circuit according to claim 8 or 9, the display panel being driven according to the display panel driving method according to any one of claims 1 to 7.

Description

Display panel driving method, driving circuit and display device Technical Field The present application relates to the field of display technologies, and in particular, to a display panel driving method, a driving circuit, and a display device. Background In the current process of TFT-LCD (Thin-Film Transistor Liquid CRYSTAL DISPLAY, thin film transistor liquid crystal display) screen display driving, in order to avoid the problem of polarity aging of liquid crystal molecules due to maintaining the same inversion angle for a long time, it is necessary to perform periodic positive and negative polarity exchange on the voltage polarity on the liquid crystal molecules, that is, the driving Source (Source) changes the direction of the electric field on each pixel point through polarity exchange control, so that the inversion direction and angle of the liquid crystal molecules are periodically changed. However, in actual driving display, before the pixel performs polarity exchange, in order to reduce the power consumption of the display panel, it is generally necessary to short-circuit the voltage output ends with opposite polarities together to perform charge sharing, so that the voltage at the voltage output ends with opposite polarities approaches to the voltage level of the other party, and a short-circuit current is formed during the short-circuit, and this short-circuit current can generate a large electromagnetic interference noise EMI (Electro MAGNETIC INTERFERENCE) on the display screen, which becomes the most dominant source of electromagnetic interference noise in TFT-LCD display driving, and affects the display effect of the display panel. Disclosure of Invention The application aims to provide a display panel driving method, a driving circuit and a display device, which reduce short-circuit current to reduce electromagnetic interference and improve the display effect of the display panel by shortening the charge sharing time of the display panel. The application discloses a display panel driving method, which comprises the following steps: in the current row, detecting whether the display panel performs positive and negative polarity switching; if yes, detecting whether to start the charge sharing function, if not, continuously detecting whether to switch positive and negative polarities until the current line is ended; If the charge sharing function is started, adjusting and shortening the charge sharing time, and if the charge sharing function is not started, continuously detecting whether the charge sharing function is started or not until the current line is ended; And (3) ending the current row, entering the next row, and repeating the steps until the display panel stops displaying. Optionally, if the charge sharing function is turned on, the charge sharing time is adjusted, and if the charge sharing function is not turned on, the step of continuously detecting whether the charge sharing function is turned on until the current line is ended includes: When the charge sharing function is detected to be entered, the short-circuit control switch is conducted so that the positive polarity voltage input end and the negative polarity voltage output end are conducted mutually; The turn-off time of the control switch of the control short circuit is advanced before the falling edge of the source output enable signal; When detecting that the charge sharing function is not entered, continuously detecting whether the charge sharing function is started or not until the current row is ended; the short circuit control switch is used for conducting two adjacent data lines with opposite driving polarities to balance positive polarity voltage and negative polarity voltage. Optionally, the on time of the short circuit control switch is later than the rising edge of the source output enable signal, and the off time of the short circuit control switch is earlier than the falling edge of the source output enable signal. Optionally, in the current row, the step of detecting whether the display panel performs positive and negative polarity switching includes: Detecting a polarity switching signal of the display panel; and judging whether the display panel performs positive and negative polarity switching according to the level change of the polarity switching signal. Optionally, the turn-off time of the short circuit control switch is at least 4ns earlier than the falling edge of the source output enable signal. Optionally, if the charge sharing function is turned on, the step of continuously detecting whether to switch the positive polarity and the negative polarity until the current line is ended includes: When the display panel is detected to switch positive and negative polarities, detecting whether a short circuit control switch is turned on; if the short circuit control switch is turned on, judging that the charge sharing function is started; if the short circuit control switch is not conducted, judging that the