Color electrophoretic display device and method for manufacturing the same

• US 8,248,686 B2
• Filed: 06/20/2011
• Issued: 08/21/2012
• Est. Priority Date: 12/23/2008
• Status: Expired due to Fees

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kwon, Oh-Nam, Lee, Jea-Gu, Kang, Seung-Chul
• Primary Examiner(s): Mack, Ricky
• Assistant Examiner(s): TRA, TUYEN Q
• Application Number:
  US13/164,444
• Publication Number:
  US 20110250712A1
• Time in Patent Office: 428 Days
• Field of Search: 359/296, 345/107, 345/105, 204/450, 204/600, 430/32, 430/34, 430/38
• US Class Current: 359/296
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/167 by electrophoresis
• CPC Class Codes: G02F 1/1677 Structural association of cells with optical devices, e.g. reflectors or illuminating devices
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements
• CPC Class Codes: H01L 27/1214 comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
• CPC Class Codes: H01L 27/1255 integrated with passive devices, e.g. auxiliary capacitors

Abstract

According to an embodiment of the present invention, a method for manufacturing a color electrophoretic display device includes forming a thin film transistor (TFT) array substrate including a display region, wherein a plurality of pixel regions is defined in a matrix, and alignment keys are provided at the outside of the display region, forming an electrophoretic layer including a micro capsule layer formed so as to correspond to the display region of the TFT array substrate, and forming a color filter layer on an outer surface of the electrophoretic layer using the alignment keys so as to correspond to the respective pixel regions of the display region.

Claims

1. A method for manufacturing a color electrophoretic display device the method, comprising:

forming a thin film transistor (TFT) array substrate including a display region, wherein a plurality of pixel regions is defined in a matrix, and alignment keys are provided at the outside of the display region;

forming an electrophoretic layer including a substrate and a micro capsule layer formed on the substrate so as to correspond to the display region of the TFT array substrate; and

forming a color filter layer with color droplets expressing a plurality of colors on an outer surface of the substrate, on which the micro capsule layer is not formed, using the alignment keys on the thin film transistor array substrate so as to correspond to the respective pixel regions of the display region.

2. The method according to claim 1, wherein the formation of the color filter layer includes:

forming an adhesive layer on the outer surface of the substrate; and

preparing the color droplets, and then spraying the color droplets onto the adhesive layer using surface roughness of the adhesive layer such that color droplets expressing one color are formed in one pixel region.

3. The method according to claim 2, further comprising:

after the formation of the color droplets expressing one color in one pixel region, hardening the color droplets by applying heat to the color droplets.

4. The method according to claim 2, further comprising:

forming a protective sheet on the color droplets.

5. The method according to claim 2, further comprising:

sealing a side of the electrophoretic layer.

6. The method according to claim 2, wherein the color droplets are formed in an island type, an overlap type, or an island-overlap combination type by adjusting the amount of the color droplets formed in the respective regions.

7. The method according to claim 1, wherein the color filter layer is formed in a stripe type of red, green, and blue color filters, or is formed in a quad type of red, green, blue, and white color filters.