Drive method for display panel displaying display frames at different refresh rates

Patent metadata

Field	Value
Publication number	US-12293733-B2
Application number	US-202218028328-A
Country	US
Kind code	B2
Filing date	May 25, 2022
Priority date	May 25, 2022
Publication date	May 6, 2025
Grant date	May 6, 2025

Abstract

A drive method for a display panel ( 100 ) includes: obtaining display data corresponding to a current display frame, and a current refresh rate (S 10 ); determining a target rate level corresponding to the current refresh rate according to the current refresh rate and prestored rate levels corresponding one-to-one to different refresh rate intervals (S 20 ); and controlling sub-pixels in the display panel ( 100 ) to be charged with a data voltage according to the target rate level and the display data (S 30 ).

First claim

What is claimed is:

1. A drive method for a display panel, comprising:
obtaining display data corresponding to a current display frame, and a current refresh rate;
determining a target rate level corresponding to the current refresh rate according to the current refresh rate and prestored rate levels corresponding one-to-one to different refresh rate intervals; and
controlling sub-pixels in the display panel to be charged with a data voltage according to the target rate level and the display data;
wherein the controlling of the sub-pixels in the display panel to be charged with the data voltage according to the target rate level and the display data comprises:
determining, according to the target rate level, a target voltage of a target level that generates a gate scanning signal, wherein target voltages, generating the gate scanning signal, corresponding to different rate levels are different; and
controlling the display panel to load the gate scanning signal onto a gate according to the target voltage, and loading the data voltage onto a data line according to the display data, so as to charge the sub-pixels in the display panel with the data voltage;
wherein the target level comprises an active level;
the determining, according to the target rate level, of the target voltage that generates the gate scanning signal comprises:
adjusting, according to the target rate level, a first reference voltage of the active level that generates the gate scanning signal, to obtain the target voltage of the active level, wherein the target voltages of the active levels corresponding to different rate levels are different; and

the controlling of the display panel to load the gate scanning signal onto the gate according to the target voltage comprises:
controlling the display panel to load the gate scanning signal onto the gate according to the obtained target voltage of the active level.

2. The drive method for the display panel according to claim 1 , wherein the first reference voltage is a first reference voltage corresponding to a set rate level; the active level is a high level; and
the adjusting, according to the target rate level, of the first reference voltage of the active level that generates the gate scanning signal, to obtain the target voltage of the active level comprises:
when the set rate level is a minimum rate level and the target rate level is greater than the minimum rate level, reducing the first reference voltage by a first active adjustment voltage, to obtain the target voltage of the active level, wherein as the rate level increases, the corresponding first active adjustment voltage increases;
when the set rate level is a maximum rate level and the target rate level is less than the maximum rate level, increasing the first reference voltage by a second active adjustment voltage, to obtain the target voltage of the active level, wherein as the rate level increases, the corresponding second active adjustment voltage decreases;
when the set rate level is greater than the minimum rate level and less than the maximum rate level and the target rate level is less than the set rate level, increasing the first reference voltage by a third active adjustment voltage, to obtain the target voltage of the active level, wherein as the rate level increases, the corresponding third active adjustment voltage decreases; and
when the set rate level is greater than the minimum rate level and less than the maximum rate level and the target rate level is greater than the set rate level, reducing the first reference voltage by a fourth active adjustment voltage, to obtain the target voltage of the active level, wherein as the rate level increases, the corresponding fourth active adjustment voltage increases.

3. The drive method for the display panel according to claim 1 , wherein the first reference voltage is a first reference voltage corresponding to a set rate level; the active level is a low level; and
the adjusting, according to the target rate level, of the first reference voltage of the active level that generates the gate scanning signal, to obtain the target voltage of the active level comprises:
when the set rate level is a minimum rate level and the target rate level is greater than the minimum rate level, increasing the first reference voltage by a fifth active adjustment voltage, to obtain the target voltage of the active level, wherein as the rate level increases, the corresponding fifth active adjustment voltage increases;
when the set rate level is a maximum rate level and the target rate level is less than the maximum rate level, reducing the first reference voltage by a sixth active adjustment voltage, to obtain the target voltage of the active level, wherein as the rate level increases, the corresponding sixth active adjustment voltage decreases;
when the set rate level is greater than the minimum rate level and less than the maximum rate level and the target rate level is less than the set rate level, reducing the first reference voltage by a seventh active adjustment voltage, to obtain the target voltage of the active level, wherein as the rate level increases, the corresponding seventh active adjustment voltage decreases; and
when the set rate level is greater than the minimum rate level and less than the maximum rate level and the target rate level is greater than the set rate level, increasing the first reference voltage by an eighth active adjustment voltage, to obtain the target voltage of the active level, wherein as the rate level increases, the corresponding eighth active adjustment voltage increases.

4. The drive method for the display panel according to claim 1 , wherein the controlling of the sub-pixels in the display panel to be charged with the data voltage according to the target rate level and the display data comprises:
controlling the display panel to load a gate scanning signal onto a gate and loading the data voltage onto a data line in the display panel according to the target rate level and the display data, such that a time interval between an end moment of a slew edge when the data line starts to load the data voltage and a start moment of a data charging phase corresponding to the sub-pixels charged with the data voltage is a time interval corresponding to the target rate level;
wherein as the refresh rate of the refresh rate interval increases, the corresponding rate level increases, and the corresponding time interval increases.

5. The drive method for the display panel according to claim 4 , wherein the loading of the data voltage onto the data line in the display panel comprises:
loading the data voltage onto the data line in the display panel according to a slew rate of the slew edge corresponding to the target rate level, to adjust the time interval, wherein as the rate level increases, the corresponding slew rate decreases.

6. The drive method for the display panel according to claim 5 , wherein the loading of the data voltage onto the data line in the display panel according to the slew rate of the slew edge corresponding to the target rate level comprises:
gating an output impedance corresponding to the target rate level according to the target rate level, to load the data voltage onto the data line after the data voltage passes through the output impedance, wherein as the rate level increases, the output impedance increases, and the corresponding slew rate decreases.

7. The drive method for the display panel according to claim 4 , wherein a start moment of the slew edge when the data line starts to load the data voltage is after the start moment of the data charging phase corresponding to the sub-pixels charged with the data voltage, and a conversion time period is provided between the start moment of the slew e

Assignees

• Hefei Boe Display Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Wang Huiming
• Zhou Liugang
• Nie Chunyang
• Feng Wenlong
• Yang Yue
• Sun Jianwei
• Zhang Heng

Classifications

• G09G2330/021

  Power management, e.g. power saving · CPC title

• G09G2320/0247

  Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G3/3688

  suitable for active matrices only · CPC title