Method of driving electrophoresis display device based on electrophoretic particle migration speeds, electrophoresis display device, and electronic apparatus

Patent metadata

Field	Value
Publication number	US-9824641-B2
Application number	US-201113088544-A
Country	US
Kind code	B2
Filing date	Apr 18, 2011
Priority date	Apr 23, 2010
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

There is disclosed a method of driving an electrophoresis display device including a display unit having a plurality of pixel electrodes, a common electrode opposite to the plurality of pixel electrodes, and a first and second electrophoresis particles that are disposed between the plurality of pixel electrodes and the common electrode, the method including applying a first or second potential to each of the pixel electrodes, and applying the first or second potential, which is periodically switched, to the common electrode, when an image displayed on the display unit is rewritten, wherein, when the first and second potentials are periodically applied to the common electrode, the application of the first potential for a first application time and the application of the second potential for a second application time different from the first application time are repeatedly performed.

First claim

What is claimed is:

1. A method of driving an electrophoresis display device including a display unit having a plurality of pixel electrodes, a common electrode opposite to the plurality of pixel electrodes, and first electrophoresis particles and second electrophoresis particles that are disposed between the plurality of pixel electrodes and the common electrode, the first electrophoresis particles being charged with a first polarity and the second electrophoresis particles being charged with a second polarity, the method comprising:
applying a first potential or a second potential to each of the plurality of pixel electrodes during a display rewrite period, and
applying the first potential or the second potential, which are periodically switched a plurality of times during the application of the first potential or the second potential to each of the plurality of pixel electrodes, to the common electrode during the display rewrite period,
wherein:
a migration speed of the first electrophoresis particles is slower than a migration speed of the second electrophoresis particles,
applying the first potential to the common electrode moves the first electrophoresis particles to a common electrode side and moves the second electrophoresis particles to a pixel electrode side,
applying the second potential to the common electrode moves the second electrophoresis particles to the common electrode side and moves the first electrophoresis particles to the pixel electrode side,
when the first potential and the second potential are periodically applied to the common electrode, the application of the first potential for a first application time duration and the application of the second potential for a second application time duration shorter than the first application time duration are repeatedly performed during the display rewrite period, and
the first application time duration and the second application time duration are set such that a distance over which the first electrophoresis particles electrically migrate during the display rewrite period according to a potential difference between the first potential and the second potential is the same as a distance over which the second electrophoresis particles electrically migrate during the display rewrite period according to the potential difference between the first potential and the second potential.

2. The method according to claim 1 ,
wherein the first application time duration and the second application time duration are set such that a time duration obtained by adding the first application time duration and second application time duration is 50 ms or less.

3. An electrophoresis display device comprising:
a display unit having a plurality of pixel electrodes, a common electrode opposite to the plurality of pixel electrodes, and first electrophoresis particles and second electrophoresis particles that are disposed between the plurality of pixel electrodes and the common electrode, the first electrophoresis particles being charged with a first polarity and the second electrophoresis particles being charged with a second polarity;
a driving circuit that supplies a plurality of potentials to the plurality of pixel electrodes and the common electrode; and
a control unit that controls the driving circuit,
wherein:
the driving circuit is controlled by the control unit such that a first potential or a second potential is applied to each of the plurality of pixel electrodes during a display rewrite period, and the first potential or the second potential, which are periodically switched a plurality of times during the application of the first potential or the second potential to each of the plurality of pixel electrodes, is applied to the common electrode during the display rewrite period,
a migration speed of the first electrophoresis particles is slower than a migration speed of the second electrophoresis particles,
applying the first potential to the common electrode moves the first electrophoresis particles to a common electrode side and moves the second electrophoresis particles to a pixel electrode side,
applying the second potential to the common electrode moves the second electrophoresis particles to the common electrode side and moves the first electrophoresis particles to the pixel electrode side,
when the first potential and the second potential are periodically applied to the common electrode, the driving circuit is controlled by the control unit such that the application of the first potential for a first application time duration and the application of the second potential for a second application time duration shorter than the first application time duration are repeatedly performed during the display rewrite period, and
the first application time duration and the second application time duration are set such that a distance over which the first electrophoresis particles electrically migrate during the display rewrite period according to a potential difference between the first potential and the second potential is the same as a distance over which the second electrophoresis particles electrically migrate during the display rewrite period according to the potential difference between the first potential and the second potential.

4. An electronic apparatus comprising an electrophoresis display device according to claim 3 .

5. The method according to claim 1 ,
wherein applying the first potential or the second potential to each of the plurality of pixel electrodes during the display rewrite period further comprises applying the first potential to a first plurality of pixel electrodes and applying the second potential to a second plurality of pixel electrodes during the display rewrite period.

6. A method of driving an electrophoresis display device including a display unit having a plurality of pixel electrodes, a common electrode opposite to the plurality of pixel electrodes, and first electrophoresis particles and second electrophoresis particles that are disposed between the plurality of pixel electrodes and the common electrode, the first electrophoresis particles being charged with a first polarity and the second electrophoresis particles being charged with a second polarity, the method comprising:
applying a first potential or a second potential to each of the plurality of pixel electrodes during a display rewrite period, and
applying the first potential or the second potential, which are periodically switched a plurality of times during the application of the first potential or the second potential to each of the plurality of pixel electrodes, to the common electrode during the display rewrite period,
wherein:
a migration speed of the first electrophoresis particles is slower than a migration speed of the second electrophoresis particles,
applying the first potential to the common electrode moves the first electrophoresis particles to a common electrode side and moves the second electrophoresis particles to a pixel electrode side,
applying the second potential to the common electrode moves the second electrophoresis particles to the common electrode side and moves the first electrophoresis particles to the pixel electrode side,
when the first potential and the second potential are periodically applied to the common electrode, the application of the first potential for a first application time duration and the application of the second potential for a second application time duration shorter than the first application time duration are repeatedly performed during the display rewrite period, and
the first application time duration and the second application time duration are set such that a time duration obtained by adding the first application time duration and second application time duration is 50 ms or less.

Assignees

• Miyazaki Atsushi
• Imai Kazuki
• Seiko Epson Corp

Inventors

• Miyazaki Atsushi
• Imai Kazuki

Classifications

• G09G2300/0857

  Static memory circuit, e.g. flip-flop · 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

• G09G3/207

  by domain size control (G09G3/3637 takes precedence) · CPC title