Liquid crystal display device including a transparent element and a reflective element with a retardation film

• US 7,929,083 B2
• Filed: 09/04/2007
• Issued: 04/19/2011
• Est. Priority Date: 09/11/2006
• Status: Expired due to Fees

• Current Assignee: Hitachi Displays Limited (Japan Display Incorporated), Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: Teramoto, Masahiro
• Primary Examiner(s): Nelms; David
• Assistant Examiner(s): Briggs; Nathanael R
• Application Number:
  US11/896,586
• Publication Number:
  US 20080062362A1
• Time in Patent Office: 1,323 Days
• Field of Search: 349/114, 349/117, 349/122
• US Class Current: 349/114
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence

Abstract

A subject of the present invention is to prevent damage to a retardation film, etc. to improve the reliability in a liquid crystal display device including a retardation film on the side of the color filter substrate.

To solve the problem, there is provided a liquid crystal display device comprising a liquid crystal display panel which includes a pair of substrates and liquid crystal supported between the pair of substrates, wherein the liquid crystal display panel includes a plurality of sub-pixels; each of the plurality of sub-pixels includes a transparent element and a reflective element; and one substrate of the pair of substrates includes: a diffuse reflection layer formed at a position corresponding to the reflective element of each individual sub-pixel, an oriented film formed on the diffuse reflection layer, a retardation film formed in a region in which the diffuse reflection layer is formed on the oriented film, a color filter formed on the retardation film, and a planarizing film formed on the color filter.

Claims

1. A liquid crystal display device comprising a liquid crystal display panel which includes a pair of substrates and liquid crystal supported between the pair of substrates, wherein

the liquid crystal display panel includes a plurality of sub-pixels;

each of the plurality of sub-pixels includes a transparent element and a reflective element;

one substrate of the pair of substrates includes;

a diffuse reflection layer formed at a position corresponding to the reflective element of each individual sub-pixel;

a color filter formed on the diffuse reflection layer;

an oriented film formed on the color filter;

a retardation film formed in a region in which the diffuse reflection layer is formed on the oriented film;

the region in which the retardation film is formed being separate from the transparent element; and

a protection film formed on the retardation film,

wherein the oriented film expands from the reflective element to the transparent element,

the protection film covers the retardation film and one part of the oriented film, the one part of the oriented film being formed in a region in which the retardation film is not formed, and

a surface of the other substrate of the pair of substrates on a side opposite to the liquid crystal is a display surface.

2. The liquid crystal display device according to claim 1, including a planarizing film formed on the color filter, wherein

the oriented film is formed on the planarizing film.

3. The liquid crystal display device according to claim 2, wherein the planarizing film acts also as the oriented film.

4. The liquid crystal display device according to claim 1, including a gap adjustment layer formed on the protection film.

5. The liquid crystal display device according to claim 2, including a gap adjustment layer formed on the protection film.

6. The liquid crystal display device according to claim 2, wherein the retardation film is composed of a polymer liquid crystal material.

7. The liquid crystal display device according to claim 4, wherein a columnar spacer being formed on the gap adjustment layer.

8. The liquid crystal display device according to claim 4, wherein a columnar spacer being formed on the gap adjustment layer.