Electrophoretic display and electronic device

• US 8,593,438 B2
• Filed: 02/15/2011
• Issued: 11/26/2013
• Est. Priority Date: 02/19/2010
• Status: Active Grant

• Current Assignee: E Ink Holdings Incorporated
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Komatsu, Yuko, Sato, Takashi
• Primary Examiner(s): Mengistu, Amare
• Assistant Examiner(s): PATEL, PREMAL R
• Application Number:
  US13/027,673
• Publication Number:
  US 20110205195A1
• Time in Patent Office: 1,015 Days
• Field of Search: 345/87, 345/107, 345/204, 204/600, 359/296
• US Class Current: 345/204
• 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 2320/0219 Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• 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 includes a first substrate, a second substrate, an electrophoretic element interposed therebetween, a plurality of scanning lines on an electrophoretic element side surface of the first substrate, a plurality of data lines extending in the crosswise directions of the plurality of scanning lines on the electrophoretic element side surface of the first substrate, a selection transistor connected to one of the scanning lines and one of the data lines, a pixel electrode connected to the selection transistor, and a capacitor with two electrodes, one of the electrode thereof being connected to the selection transistor and the pixel electrode, and the other electrode thereof being connected to one of the scanning lines, wherein a plurality of pixel electrodes are arranged so that a dot density thereof is more than or equal to 200 dpi.

Claims

1. An electrophoretic display comprising:

a first substrate;

a second substrate;

an electrophoretic element interposed therebetween;

a plurality of scanning lines on an electrophoretic element side surface of the first substrate;

a plurality of data lines extending in the crosswise directions of the plurality of scanning lines on the electrophoretic element side surface of the first substrate;

a first selection transistor directly electrically connected to a first scanning line and a first data line;

a second selection transistor directly electrically connected to a second scanning line and the first data line;

a first pixel electrode directly electrically connected to the first selection transistor;

a second pixel electrode directly electrically connected to the second selection transistor; and

a capacitor with two electrodes, one electrode thereof being directly electrically connected to the second selection transistor and the second pixel electrode, and the other electrode thereof being directly electrically connected to the first scanning line,

wherein a plurality of pixel electrodes are arranged so that a dot density thereof is more than or equal to 200 dpi.

2. The electrophoretic display according to claim 1, wherein the first scanning line is driven immediately before the second scanning line.

3. An electronic device comprising the electrophoretic display claim 2.

4. An electronic device comprising the electrophoretic display claim 1.

5. The electrophoretic display according to claim 1, wherein the other electrode of the capacitor is an extending section of the first scanning line.

6. An electrophoretic display comprising:

a first substrate;

a second substrate;

an electrophoretic element interposed therebetween;

a plurality of scanning lines on an electrophoretic element side surface of the first substrate;

a plurality of data lines extending in the crosswise directions of the plurality of scanning lines on the electrophoretic element side surface of the first substrate;

a first selection transistor directly electrically connected to a first scanning line and a first data line;

a second selection transistor directly electrically connected to a second scanning line and the first data line;

a first pixel electrode directly electrically connected to the first selection transistor;

a second pixel electrode directly electrically connected to the second selection transistor; and

a capacitor with two electrodes, one electrode thereof being directly electrically connected to the second selection transistor and the second pixel electrode, and the other electrode thereof being directly electrically connected to the first scanning line,

wherein a parasitic capacitance Cgs of the first selection transistor is less than or equal to 1% of a capacitance Cs of the capacitor.

7. An electronic device comprising the electrophoretic display claim 6.

8. The electrophoretic display according to claim 6, wherein the other electrode of the capacitor is an extending section of the first scanning line.

9. An electrophoretic display comprising:

a first substrate;

a second substrate;

an electrophoretic element interposed therebetween;

a plurality of scanning lines on an electrophoretic element side surface of the first substrate;

a plurality of data lines extending in the crosswise directions of the plurality of scanning lines on the electrophoretic element side surface of the first substrate;

a plurality of capacitor lines formed so as to correspond to the respective scanning lines or the respective data lines;

a first selection transistor directly electrically connected to a first scanning line and a first data line;

a second selection transistor directly electrically connected to a second scanning line and the first data line;

a first pixel electrode directly electrically connected to the first selection transistor;

a second pixel electrode directly electrically connected to the second selection transistor; and

a capacitor having one electrode directly electrically connected to the second selection transistor and the second pixel electrode,

wherein the capacitor includes a first capacitor having the other electrode directly electrically connected to the first scanning line, and a second capacitor having the other electrode directly electrically connected to one of the capacitor lines.

10. An electronic device comprising the electrophoretic display claim 9.

11. The electrophoretic display according to claim 9, wherein the other electrode of the first capacitor is an extending section of the first scanning line.