Color display devices

• US 8,605,354 B2
• Filed: 02/10/2012
• Issued: 12/10/2013
• Est. Priority Date: 09/02/2011
• Status: Active Grant

• Current Assignee: E Ink Holdings Incorporated
• Original Assignee: SiPix Imaging, Inc. (E Ink Holdings Incorporated)
• Inventors: Zhang, Xiaojia, Lin, Craig, Sprague, Robert A.
• Primary Examiner(s): CHOI, WILLIAM C
• Application Number:
  US13/371,293
• Publication Number:
  US 20130057463A1
• Time in Patent Office: 669 Days
• Field of Search: 359/296, 345/107, 430/32, 204/600
• US Class Current: 359/296
• CPC Class Codes: G02F 1/167 by electrophoresis
• CPC Class Codes: G02F 2001/1678 characterised by the composition or particle type
• CPC Class Codes: G02F 2203/34 Colour display without the use of colour mosaic filters
• CPC Class Codes: G09F 9/372 the positions of the elements being controlled by the application of an electric field
• CPC Class Codes: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• 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
• CPC Class Codes: G09G 3/3446 with more than two electrodes controlling the modulating element

Abstract

The present invention is directed to a color display comprising an electrophoretic fluid comprising two types of pigment particles of contrasting colors and carrying opposite charge polarities dispersed in a clear and colorless solvent, wherein said electrophoretic fluid is sandwiched between a common electrode and a plurality of colored sub-pixel electrodes or colored pixel electrodes.

Claims

1. A color display comprising an electrophoretic fluid comprising two types of pigment particles of contrasting colors and carrying opposite charge polarities dispersed in a clear and colorless solvent, wherein said electrophoretic fluid is sandwiched between a common electrode and a plurality of colored sub-pixel electrodes or colored pixel electrodes.

2. The color display of claim 1, which comprises a plurality of pixels, wherein:

a) each of said pixels comprises two sub-pixels,

b) each of said sub-pixels is sandwiched between the common electrode and at least two colored sub-pixel electrodes, and

c) among the four sub-pixel electrodes at least one is red, one is green and one is blue.

3. The display of claim 2, wherein the two types of pigment particles are black and white respectively.

4. The display of claim 3, wherein the sub-pixel electrode is underneath a colored layer.

5. The display of claim 4, wherein said colored layer is a colored sealing layer enclosing the electrophoretic fluid within a display cell.

6. The display of claim 4, further comprising an adhesive layer between the colored layer and the sub-pixel electrode.

7. The display of claim 6, wherein said adhesive layer is a reflective layer.

8. The color display of claim 1, which comprises a plurality of pixels, wherein:

a) each of said pixels is sandwiched between the common electrode and at least three colored pixel electrodes, and

b) among the three pixel electrodes one is red, one is green and one is blue.

9. The display of claim 8, wherein the two types of pigment particles are black and white respectively.

10. The display of claim 9, wherein the pixel electrode is underneath a colored layer.

11. The display of claim 10, wherein the colored layer is a colored sealing layer enclosing the electrophoretic fluid within a display cell.

12. The display of claim 10, further comprising an adhesive layer between the colored layer and the pixel electrode.

13. The display of claim 12, wherein the adhesive layer is a reflective layer.

14. The color display of claim 1, which comprises a plurality of pixels, wherein:

a) each of said pixels is sandwiched between the common electrode and two colored pixel electrodes, and

b) the two colored pixel electrodes are of the same color.

15. The display of claim 14, wherein the two types of pigment particles are black and white respectively.

16. The display of claim 15, wherein the pixel electrode is underneath a colored layer.

17. The display of claim 16, wherein the colored layer is a colored sealing layer enclosing the electrophoretic fluid within a display cell.

18. The display of claim 16, further comprising an adhesive layer between the colored layer and the pixel electrode.

19. The display of claim 18, wherein the adhesive layer is a reflective layer.