Color electronic paper display device and method for manufacturing the same

• US 20110298786A1
• Filed: 09/22/2010
• Published: 12/08/2011
• Est. Priority Date: 06/07/2010
• Status: Abandoned Application

• Current Assignee: Hong Kong University of Science and Technology, Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Lee, Sang Moon, Cho, Jae Choon, Jung, Hyung Mi, Lee, Choon Keun
• Application Number:
  US12/923,456
• Publication Number:
  US 20110298786A1
• Time in Patent Office: Days
• US Class Current: 345/214
• CPC Class Codes: G02B 26/026 based on the rotation of particles under the influence of an external field, e.g. gyricons, twisting ball displays based on orientable dipolar particles G02F1/172; based on electrophoresis G02F1/167
• CPC Class Codes: G09G 3/3453 based on rotating particles or microelements

Abstract

The present invention provides a color electronic paper display device including: rotating balls; a barrier structure for partitioning the rotating balls; and an electrode structure which is provided in the barrier structure and applies voltages to the rotating balls, wherein the barrier structure is made of a photo-reactive barrier material including insulating resin, hardener, and a photo-sensitive material.

Claims

1. A color electronic paper display device comprising:

rotating balls;

a barrier structure for partitioning the rotating balls; and

an electrode structure which is provided in the barrier structure and applies voltages to the rotating balls,

wherein the barrier structure is made of a photo-reactive barrier material including insulating resin, hardener, and a photo-sensitive material.

2. The color electronic paper display device of claim 1, wherein the insulating resin includes at least one of naphthalene epoxy resin and rubber modified epoxy resin.

3. The color electronic paper display device of claim 1, wherein the hardener includes at least one of phenol novolac and bisphenol novolac.

4. The color electronic paper display device of claim 1, wherein the photo-sensitive material includes a photo-sensitive monomer and photo-initiator, the photo-sensitive monomer including acrylate resin.

5. The color electronic paper display device of claim 1, wherein the photo-reactive barrier material further includes an inorganic filler, the inorganic filler including at least one of graphite, carbon black, silica, and clay.

6. The color electronic paper display device of claim 1, wherein the barrier structure includes side walls for partitioning each of the rotating balls, the side walls defining cavities with cylinder shapes.

7. The color electronic paper display device of claim 1, wherein the barrier structure includes side walls for partitioning each of the rotating balls, the side walls defining the cavities whose upper and lower diameters are the same.

8. The color electronic paper display device of claim 1, wherein the barrier structure includes side walls for partitioning each of the rotating balls, the side walls having side surfaces with an up and down vertical structure.

9. The color electronic paper display device of claim 1, wherein the barrier structure includes side walls for partitioning each of the rotating balls, the side walls having thicknesses of 20 μ

m or lower.

10. The color electronic paper display device of claim 1, wherein the barrier structure is formed through a photolithography process.

11. A method for manufacturing a color electronic paper display device comprising:

preparing a photo-reactive barrier material which includes an insulating resin, hardener, and a photo-sensitive material;

forming a barrier structure for defining cavities of cylinder shapes, on a base substrate;

positioning rotating balls within the cavities; and

forming an electrode structure which applies voltages to the rotating balls on the barrier structure.

12. The method of claim 11, wherein at least one of naphthalene epoxy resin and rubber modified epoxy resin is used as the insulating resin.

13. The method of claim 11, wherein at least one of phenol novolac and bisphenol novolac is used as the hardener.

14. The method of claim 11, wherein the photo-sensitive material includes a photo-sensitive monomer and a photo-initiator, the photo-sensitive monomer including acrylate resin.

15. The method of claim 11, wherein forming the barrier structure further comprises curing the photo-reactive barrier material.

16. The method of claim 11, wherein forming the barrier structure comprises:

forming the photo-reactive barrier material on the base substrate at a uniform thickness; and

performing a photolithography process for the photo-reactive barrier material.

17. The method of claim 16, wherein performing the photolithography process comprises:

positioning a mask for light-shielding desired regions where the cavities of the photo-reactive barrier material are to be formed;

scanning light on the photo-reactive barrier material through the mask; and

performing a developing process for removing non light-receiving areas of the photo-reactive barrier material.

18. The method of claim 17, wherein performing the developing process comprises:

supplying a developing solution containing Na₂CO₃ to the photo-reactive barrier material; and

supplying an organic solvent to dissolve the insulating resin of the photo-reactive barrier material.