Method and apparatus for driving electrophoretic display panel, and display device

Patent metadata

Field	Value
Publication number	US-10755649-B2
Application number	US-201816316943-A
Country	US
Kind code	B2
Filing date	May 14, 2018
Priority date	Aug 9, 2017
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

Embodiments of the present disclosure provide a method and apparatus for driving an electrophoretic display panel, and a display device. The electrophoretic display panel includes a first electrode layer, a second electrode layer, and charged particles distributed between the first electrode layer and the second electrode layer. In the method for driving an electrophoretic display panel, a direct current voltage signal is applied to the first electrode layer to cause the charged particles to move to a predetermined position. An alternating current voltage signal is applied to the first electrode layer to cause the charged particles to oscillate. A data voltage signal is applied to the first electrode layer for display. After the charged particles oscillate, the motion activity can be improved, so that the charged particles may more accurately move according to the data voltage signal, thereby improving display accuracy.

First claim

What is claimed is:

1. A method for driving an electrophoretic display panel, wherein the electrophoretic display panel comprises a first electrode layer, a second electrode layer, and charged particles distributed between the first electrode layer and the second electrode layer, the method comprising:
applying a direct current voltage signal to the first electrode layer to cause the charged particles to move to a predetermined position;
applying an alternating current voltage signal to the first electrode layer to cause the charged particles to oscillate; and
applying a data voltage signal to the first electrode layer for display;
wherein the method further comprises:
applying a compensation voltage signal to the first electrode layer according to a magnitude and a duration of the direct current voltage signal and a magnitude and a duration of the data voltage signal, such that a time during which a positive voltage is applied to the first electrode layer is equal to a time during which a negative voltage is applied to the first electrode layer;
wherein the compensation voltage signal is applied prior to applying the direct current voltage signal;
wherein the frequency is greater than or equal to about 30 Hz.

2. The method for driving an electrophoretic display panel according to claim 1 , wherein the alternating current voltage signal is a square wave voltage signal.

3. The method for driving an electrophoretic display panel according to claim 2 , wherein a duty ratio of the square wave voltage signal is about 50%.

4. The method for driving an electrophoretic display panel according to claim 1 , wherein the alternating current voltage signal is applied after applying the direct current voltage signal.

5. The method for driving an electrophoretic display panel according to claim 1 , wherein the alternating current voltage signal is applied prior to applying the direct current voltage signal.

6. The method for driving an electrophoretic display panel according to claim 1 , wherein a duration of the alternating current voltage signal is less than or equal to a duration of the direct current voltage signal.

7. The method for driving an electrophoretic display panel according to claim 6 , wherein the duration of the alternating current voltage signal is less than or equal to half of the duration of the direct current voltage signal.

8. The method for driving an electrophoretic display panel according to claim 1 , wherein the first electrode layer is a pixel electrode layer and wherein the second electrode layer is a common electrode layer.

9. The method for driving an electrophoretic display panel according to claim 1 , wherein the electrophoretic display panel is an electronic paper display panel.

10. An apparatus for driving an electrophoretic display panel, wherein the electrophoretic display panel comprises a first electrode layer, a second electrode layer, and charged particles distributed between the first electrode layer and the second electrode layer, wherein the apparatus for driving an electrophoretic display panel comprises a first circuit, a second circuit, and a data voltage circuit connected to the first electrode layer;
wherein the first circuit is configured to apply a direct current voltage signal to the first electrode layer to cause the charged particles to move to a predetermined position;
wherein the second circuit is configured to apply an alternating current voltage signal to the first electrode layer to cause the charged particles to oscillate; and
wherein the data voltage circuit is configured to apply a data voltage signal to the first electrode layer for display;
wherein the apparatus for driving an electrophoretic display panel further comprises a compensation voltage circuit connected to the first electrode layer,
wherein the compensation voltage circuit is configured to apply a compensation voltage signal to the first electrode layer according to a magnitude and a duration of the direct current voltage signal and a magnitude and a duration of the data voltage signal, such that a time during which a positive voltage is applied to the first electrode layer is equal to a time during which a negative voltage is applied to the first electrode layer;
wherein the compensation voltage signal is applied prior to applying the direct current voltage signal;
wherein the frequency is greater than or equal to about 30 Hz.

11. A display device comprising:
an electrophoretic display panel, comprising a first electrode layer, a second electrode layer, and charged particles distributed between the first electrode layer and the second electrode layer; and
the apparatus for driving an electrophoretic display panel according to claim 10 .

12. The method for driving an electrophoretic display panel according to claim 2 , wherein the alternating current voltage signal is applied after applying the direct current voltage signal.

13. The method for driving an electrophoretic display panel according to claim 3 , wherein the alternating current voltage signal is applied after applying the direct current voltage signal.

Assignees

• Beijing Boe Optoelectronics Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Fang Haobo
• Xue Yanna
• Bao Zhiying
• Zhang Yong
• Mi Lei
• Bai Lu
• Hua Gang
• Wang Jingpeng
• Yuan Lingxiang

Classifications

• G09G2230/00

  Details of flat display driving waveforms · CPC title

• G09G2310/061

  for resetting or blanking · CPC title

• G09G2330/021

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

• G09G2310/068

  Application of pulses of alternating polarity prior to the drive pulse in electrophoretic displays · 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