ELECTROPHORETIC DISPLAY DEVICE AND DRIVING METHOD THEREOF

• US 20100231580A1
• Filed: 05/27/2010
• Published: 09/16/2010
• Est. Priority Date: 03/18/2005
• Status: Abandoned Application

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: MIYASAKA, Mitsutoshi
• Application Number:
  US12/788,787
• Publication Number:
  US 20100231580A1
• Time in Patent Office: Days
• US Class Current: 345/214
• CPC Class Codes: G09G 2300/0876 Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
• CPC Class Codes: G09G 2320/066 for control of contrast
• CPC Class Codes: G09G 3/344 based on particles moving in a fluid or in a gas, e.g. electrophoretic devices electrophoretic devices per se G02F1/167

Abstract

An electrophoretic display device including a pixel electrode provided in the pixel, a capacitor line provided in the pixel, a storage capacitor provided in the pixel, and a second electrode of the storage capacitor being coupled to a storage capacitor line and a thin film transistor (TFT) provided in the pixel, a source electrode of the TFT being coupled to a first electrode of the storage capacitor and the pixel electrode, a drain electrode of the TFT being coupled to the signal line, and a gate electrode of the TFT being coupled to the scan line. A capacitor line low select signal VSL or a capacitor line non-select signal VSC having a higher electric potential than an electric potential of the capacitor line low select signal VSL is supplied to the storage capacitor line.

Claims

1. An electrophoretic display device, comprising:

a scan line;

a signal line;

a pixel provided at an intersection of the signal line and the scan line, the pixel including a first electrode, a thin film transistor, a storage capacitor having a first capacitor electrode and a second capacitor electrode;

a second electrode facing the first electrode;

an electrophoretic material interposed between the first electrode and the second electrode, the electrophoretic material including a positively charged particle; and

a storage capacitor line connected to the second capacitor electrode,

wherein one of a source electrode and a drain electrode of the thin film transistor is coupled to the first capacitor electrode and the first electrode, the other of the source electrode and the drain electrode of the thin film transistor is coupled to the signal line, and a gate electrode of the thin film transistor is coupled to the scan line,

wherein during a reset period, an electronic potential which is higher than an electronic potential of the second electrode is provided to the first electrode, and a first electronic potential is provided to the storage capacitor line,

wherein an image data is provided to the pixel during a writing period being executed after the reset period,

wherein a second electronic potential higher than the first electronic potential is provided to the storage capacitor line during a period between the reset period and the writing period.

2. The electrophoretic display device according to claim 1,

wherein the positively charged particle is drawn to the second electrode side during the reset period,

wherein the positively charged particle is further drawn to the second electrode side during the period in which the second electronic potential is provided to the storage capacitor line.

3. The electrophoretic display device according to claim 1, wherein an electronic potential of the second electrode during the writing period is higher than the electric potential of the second electrode during the reset period.

4. An electrophoretic display device, comprising:

a scan line;

a signal line;

a pixel provided at an intersection of the signal line and the scan line, the pixel including a first electrode, a thin film transistor, a storage capacitor having a first capacitor electrode and a second capacitor electrode;

a second electrode facing the first electrode;

an electrophoretic material interposed between the first electrode and the second electrode, the electrophoretic material including a negatively charged particle; and

a storage capacitor line connected to the second capacitor electrode,

wherein one of a source electrode and a drain electrode of the thin film transistor is coupled to the first capacitor electrode and the first electrode, the other of the source electrode and the drain electrode of the thin film transistor is coupled to the signal line, and a gate electrode of the thin film transistor is coupled to the scan line,

wherein during a reset period, an electronic potential which is lower than an electronic potential of the second electrode is provided to the first electrode, and a first electronic potential is provided to the storage capacitor line,

wherein an image data is provided to the pixel during a writing period being executed after the reset period,

wherein a second electronic potential lower than the first electronic potential is provided to the storage capacitor line during a period between the reset period and the writing period.

5. The electrophoretic display device according to claim 4,

wherein the negatively charged particle is drawn to the second electrode side during the reset period,

wherein the negatively charged particle is further drawn to the second electrode side during the period in which the second electronic potential is provided to the storage capacitor line.

6. The electrophoretic display device according to claim 4, wherein an electronic potential of the second electrode during the writing period is lower than the electric potential of the second electrode during the reset period.

7. An driving method of an electrophoretic display device, the electrophoretic display device including:

a scan line;

a signal line;

a pixel provided at an intersection of the signal line and the scan line, the pixel including a first electrode, a thin film transistor, a storage capacitor having a first capacitor electrode and a second capacitor electrode;

a second electrode facing the first electrode;

an electrophoretic material interposed between the first electrode and the second electrode, the electrophoretic material including a positively charged particle; and

a storage capacitor line connected to the second capacitor electrode,

wherein one of a source electrode and a drain electrode of the thin film transistor is coupled to the first capacitor electrode and the first electrode, the other of the source electrode and the drain electrode of the thin film transistor is coupled to the signal line, and a gate electrode of the thin film transistor is coupled to the scan line,

the method comprising;

during a reset period, providing the first electrode with an electronic potential which is higher than an electronic potential of the second electode, and providing the storage capacitor line with a first electronic potential,

providing the pixel with an image data during a writing period being executed after the reset period,

providing the storage capacitor line with a second electronic potential higher than the first electronic potential during a period between the reset period and the writing period.

8. The driving method according to claim 7,

wherein the positively charged particle is drawn to the second electrode side during the reset period,

wherein the positively charged particle is further drawn to the second electrode side during the period in which the second electronic potential is provided to the storage capacitor line.

9. The driving method according to claim 7, wherein an electronic potential of the second electrode during the writing period is higher than the electric potential of the second electrode during the reset period.

10. An driving method of an electrophoretic display device, the electrophoretic display device including:

a scan line;

a signal line;

a pixel provided at an intersection of the signal line and the scan line, the pixel including a first electrode, a thin film transistor, a storage capacitor having a first capacitor electrode and a second capacitor electrode;

a second electrode facing the first electrode;

an electrophoretic material interposed between the first electrode and the second electrode, the electrophoretic material including a negatively charged particle; and

a storage capacitor line connected to the second capacitor electrode,

wherein one of a source electrode and a drain electrode of the thin film transistor is coupled to the first capacitor electrode and the first electrode, the other of the source electrode and the drain electrode of the thin film transistor is coupled to the signal line, and a gate electrode of the thin film transistor is coupled to the scan line,

the method comprising;

during a reset period, providing the first electrode with an electronic potential which is lower than an electronic potential of the second electode, and providing the storage capacitor line with a first electronic potential,

providing the pixel with an image data during a writing period being executed after the reset period,

providing the storage capacitor line with a second electronic potential lower than the first electronic potential during a period between the reset period and the writing period.

11. The driving method according to claim 10,

wherein the negatively charged particle is drawn to the second electrode side during the reset period,

wherein the negatively charged particle is further drawn to the second electrode side during the period in which the second electronic potential is provided to the storage capacitor line.

12. The driving method according to claim 10, wherein an electronic potential of the second electrode during the writing period is lower than the electric potential of the second electrode during the reset period.

13. A controller for an electrophoretic display device, the electrophoretic display device including:

a scan line;

a signal line;

a pixel provided at an intersection of the signal line and the scan line, the pixel including a first electrode, a thin film transistor, a storage capacitor having a first capacitor electrode and a second capacitor electrode;

a second electrode facing the first electrode;

an electrophoretic material interposed between the first electrode and the second electrode, the electrophoretic material including a positively charged particle;

a storage capacitor line connected to the second capacitor electrode; and

a driving circuit driving the scan line and the signal line,

wherein one of a source electrode and a drain electrode of the thin film transistor is coupled to the first capacitor electrode and the first electrode, the other of the source electrode and the drain electrode of the thin film transistor is coupled to the signal line, and a gate electrode of the thin film transistor is coupled to the scan line,

the controller controls the driving circuit such that the driving circuit executes a driving method including;

during a reset period, providing the first electrode with an electronic potential which is higher than an electronic potential of the second electrode, and providing the storage capacitor line with a first electronic potential,

providing the pixel with an image data during a writing period being executed after the reset period,

providing the storage capacitor line with a second electronic potential higher than the first electronic potential during a period between the reset period and the writing period.

14. A controller for an electrophoretic display device, the electrophoretic display device including:

a scan line;

a signal line;

a pixel provided at an intersection of the signal line and the scan line, the pixel including a first electrode, a thin film transistor, a storage capacitor having a first capacitor electrode and a second capacitor electrode;

a second electrode facing the first electrode;

an electrophoretic material interposed between the first electrode and the second electrode, the electrophoretic material including a negatively charged particle;

a storage capacitor line connected to the second capacitor electrode; and

a driving circuit driving the scan line and the signal line,

wherein one of a source electrode and a drain electrode of the thin film transistor is coupled to the first capacitor electrode and the first electrode, the other of the source electrode and the drain electrode of the thin film transistor is coupled to the signal line, and a gate electrode of the thin film transistor is coupled to the scan line,

the controller controls the driving circuit such that the driving circuit executes a driving method including;

during a reset period, providing the first electrode with an electronic potential which is lower than an electronic potential of the second electrode, and providing the storage capacitor line with a first electronic potential,

providing the pixel with an image data during a writing period being executed after the reset period,

providing the storage capacitor line with a second electronic potential lower than the first electronic potential during a period between the reset period and the writing period.