Liquid crystal display device and method for manufacturing the same

• US 20070182889A1
• Filed: 04/09/2007
• Published: 08/09/2007
• Est. Priority Date: 12/26/2002
• Status: Abandoned Application

• Current Assignee: Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Original Assignee: Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Inventors: Togashi, Seigo
• Application Number:
  US11/783,373
• Publication Number:
  US 20070182889A1
• Time in Patent Office: Days
• US Class Current: 349/106
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133516 Methods for their manufacture, e.g. printing, electro-deposition or photolithography
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/136222 Colour filters incorporated in the active matrix substrate

Abstract

A liquid crystal display device comprises: first and second transparent substrates; a liquid crystal that is enclosed between the first and second transparent substrates; a first color filter that is formed on either the first or second transparent substrate; a light reflective layer that has a plurality of openings and that is formed on the second transparent substrate toward the liquid crystal; and a second color filter that is formed on the second transparent substrate on the side opposite to the liquid crystal. The second color filter is fabricated by forming a layer of a color photosensitive material such as a photosensitive emulsion and illuminating and coloring this layer by light transmitting through the first color filter using the reflective layer as an exposure mask. As a result, a second color filter, that has a color dot pattern the same as that of the first color filter, is formed by one exposure and developing process.

Claims

1. A liquid crystal display device, comprising:

first and second transparent substrates;

a liquid crystal that is enclosed between said first and second transparent substrates;

a first color filter that is formed on either said first or second transparent substrate;

a light reflective layer that has a plurality of openings and that is formed on said second transparent substrate toward the liquid crystal; and

a second color filter that is formed on said second transparent substrate on the side opposite to said liquid crystal,

wherein said first color filter is formed on said light reflective laver of said second substrate.

2. A liquid crystal display device according to claim 1, wherein said second color filter is made of a color photosensitive material.

5. A liquid crystal display device according to claim 1, wherein said first color filter is formed of a plurality of dots comprised of colors of red, green and blue and the center of each dot of said first color filter agrees with the center of said openings of said light reflective layer.

6. A liquid crystal display device according to claim 2, wherein said color photosensitive material comprises a photosensitive emulsion.

7. A liquid crystal display device according to claim 1, wherein a backlight device is disposed below a surface of said second transparent substrate and on the side opposite to said liquid crystal.

3-4. -4. (canceled)

8-16. -16. (canceled)

17. A liquid crystal display device, comprising:

first and second transparent substrates;

a liquid crystal that is enclosed between said first and second transparent substrates;

a first color filter that is formed on either said first or second transparent substrate;

a light reflective layer that has a plurality of openings and that is formed on said second transparent substrate toward the liquid crystal; and

a second color filter that is formed on said second transparent substrate on the side opposite to said liquid crystal,

wherein said first and second color filters have substantially equal optical densities.

18. A liquid crystal display device according to claim 17, wherein said first color filter is formed of a plurality of dots comprised of colors of red, green and blue and the center of each dot of said first color filter agrees with the center of said openings of said light reflective layer.

19. A liquid crystal display device according to claim 17, wherein said second color filter is made of a color photosensitive material.

20. A liquid crystal display device according to claim 19, wherein said color photosensitive material comprises a photosensitive emulsion.

21. A liquid crystal display device according to claim 17, wherein a backlight device is disposed below a surface of said second transparent substrate and on the side opposite to said liquid crystal.