Electronic paper display apparatus, driving method thereof and computer-readable storage medium

Patent metadata

Field	Value
Publication number	US-12190835-B2
Application number	US-202118280985-A
Country	US
Kind code	B2
Filing date	Oct 29, 2021
Priority date	Oct 29, 2021
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

A driving method of an electronic paper display apparatus, including: inputting, by a controller, a first driving signal to a pixel electrode of a pixel driving circuit corresponding to a pixel which is required to display black, according to an image to be displayed; and inputting, by the controller, a second driving signal to a pixel electrode of a pixel driving circuit corresponding to a pixel which is required display white, according to the image to be displayed. A driving stage of the electronic paper display apparatus comprises a first homogenization stage which comprises a plurality of homogenization sub-stages. At a last homogenization sub-stage, the first and second driving signals comprise first and second driving sub-signals, respectively. Voltages of the first driving sub-signal and the second driving sub-signal have polarities opposite to polarities of the black particles and the white particles, respectively.

First claim

What is claimed is:

1. A driving method of an electronic paper display apparatus, wherein the electronic paper display apparatus comprises a controller, a base substrate, a plurality of pixel driving circuits on the base substrate, and an electronic paper film, wherein the electronic paper film comprises a plurality of microstructures, and the plurality of pixel driving circuits comprises a common electrode and a plurality of pixel electrodes among the plurality of microstructures; each of the plurality of microstructures comprises black particles, white particles, and color particles; wherein charges of the black particles have a polarity opposite to a polarity of charges of the white particles and the same as a polarity of charges of the color particles, and a charge-to-mass ratio of the black particles is greater than a charge-to-mass ratio of the color particles; wherein the driving method comprises:
inputting, by the controller, a first driving signal to the pixel electrode of the pixel driving circuit corresponding to a pixel which is required to display black, according to an image to be displayed; and inputting, by the controller, a second driving signal to the pixel electrode of the pixel driving circuit corresponding to a pixel which is required display white, according to the image to be displayed; wherein
a driving stage of the electronic paper display apparatus comprises a first homogenization stage, and the first homogenization stage comprises a plurality of homogenization sub-stages; at a last one of the plurality of homogenization sub-stages, the first driving signal comprises a first driving sub-signal, and the second driving signal comprises a second driving sub-signal; and
a voltage of the first driving sub-signal has a polarity opposite to the polarity of the black particles; and a voltage of the second driving sub-signal has a polarity opposite to the polarity of the white particles,
wherein the driving method further comprises: inputting, by the controller, a third driving signal to the pixel electrode of the pixel driving circuit corresponding to a pixel which is required to display a color, according to the image to be displayed; wherein at the last one of the plurality of homogenization sub-stages of the first homogenization stage, the third driving signal comprises a third driving sub-signal; and a voltage of the third driving sub-signal has a polarity opposite to the polarity of the color particles,
wherein starting moments of driving of the plurality of homogenization sub-stages of the first homogenization stage sequentially increases, and the plurality of homogenization sub-stages are a first homogenization sub-stage, a second homogenization sub-stage, a third homogenization sub-stage and a fourth homogenization sub-stage; the first driving signal further comprises a nineteenth driving sub-signal at the first homogenization sub-stage and the second homogenization sub-stage; the second driving signal further comprises a twenty-first driving sub-signal at the first homogenization sub-stage and the second homogenization sub-stage; and the third driving signal further comprises a twenty-third driving sub-signal at the first homogenization sub-stage and the second homogenization sub-stage; and
the nineteenth driving sub-signal, the twenty-first driving sub-signal and the twenty-third driving sub-signal each comprise pulse signals with positive and negative voltages sequentially altered.

2. The driving method according to claim 1 , wherein the driving stage of the electronic paper display apparatus further comprises a second homogenization stage, and the second homogenization stage is before the first homogenization stage; the first driving signal further comprises a fourth driving sub-signal at the second homogenization stage, the second driving signal further comprises a fifth driving sub-signal at the second homogenization stage, and the third driving signal further comprises a sixth driving sub-signal at the second homogenization stage; and
the fourth driving sub-signal, the fifth driving sub-signal, and the sixth driving sub-signal each comprise a first voltage and a second voltage; wherein an effective duration of the second voltage is greater than an effective duration of the first voltage.

3. The driving method according to claim 2 , wherein the driving stage of the electronic paper display apparatus further comprises a third homogenization stage, and the third homogenization stage is between the second homogenization stage and the first homogenization stage; the first driving signal further comprises a seventh driving sub-signal at the third homogenization stage, the second driving signal further comprises an eighth driving sub-signal at the third homogenization stage, and the third driving signal further comprises a ninth driving sub-signal at the third homogenization stage; and the seventh driving sub-signal, the eighth driving sub-signal and the ninth driving sub-signal each comprise pulse signals with positive and negative voltages sequentially alternated.

4. The driving method according to claim 3 , wherein in the pulse signals of each of the seventh driving sub-signal, the eighth driving sub-signal, and the ninth driving sub-signal, an effective duration of the negative voltage is greater than an effective duration of the positive voltage.

5. The driving method according to claim 1 , wherein the driving stage of the electronic paper display apparatus further comprises a fourth homogenization stage, and the fourth homogenization stage is before a display stage of the electronic paper display apparatus; the first driving signal further comprises a tenth driving sub-signal at the fourth homogenization stage, the second driving signal further comprises an eleventh driving sub-signal at the fourth homogenization stage, and the third driving signal further comprises a twelfth driving sub-signal at the fourth homogenization stage;
the tenth driving sub-signal and the eleventh driving sub-signal each comprise pulse signals with negative and positive voltages sequentially alternated; the pulse signals of the twelfth driving sub-signal and the tenth driving sub-signal are inverse to the pulse signals of the tenth driving sub-signal; and
a voltage of the common electrode of the pixel driving circuit comprises pulse signals with negative and positive voltages sequentially alternated, and an absolute value of the voltage the common electrode is the same as an absolute value of the pixel electrode, in a same pixel driving circuit.

6. The driving method according to claim 5 , wherein the driving stage of the electronic paper display apparatus further comprises a balance stage, and the balance stage is before the fourth homogenization stage; the first driving signal further comprises a thirteenth driving sub-signal at the balance stage, the second driving signal further comprises a fourteenth driving sub-signal at the balance stage, and the third driving signal further comprises a fifteenth driving sub-signal at the balance stage; and
the thirteenth driving sub-signal and the fourteenth driving sub-signal are capable of driving the white particles in the microstructure back to initial positions; and the fifteenth driving sub-signal is capable of driving the white particles and the color particles in the microstructures back to initial positions.

7. The driving method according to claim 5 , wherein the display stage comprises a first display sub-stage, a second display sub-stage, and a third display sub-stage; the first driving signal further comprises a sixteenth driving sub-signal at the first display sub-stage, the second driving signal further comprises a seventeenth driving sub-signal at the first display sub-stage, and the third driving signal further comprises

Assignees

• Chongqing Boe Smart Electronics System Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Ma Senlei
• Chen Lichun
• Cheng Qiangeng
• Deng Kaijun
• Liu Yuanzhuo
• Wu Jun
• Shi Lianghui

Classifications

• G09G3/34 Primary

  by control of light from an independent source · CPC title

• G09G2320/0257

  Reduction of after-image effects · CPC title

• G09G3/344 Primary

  based on particles moving in a fluid or in a gas, e.g. electrophoretic devices (electrophoretic devices per se G02F1/167) · CPC title