Color filter substrate and liquid crystal display device

• US 5,642,176 A
• Filed: 11/24/1995
• Issued: 06/24/1997
• Est. Priority Date: 11/28/1994
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Abukawa, Kotaro, Tanaka, Toshimitsu
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Duong, Tai V.
• Application Number:
  US08/562,379
• Time in Patent Office: 578 Days
• Field of Search: 359/54, 359/66, 359/68, 359/888, 359/891, 345/88, 345/89, 345/149, 348/760, 348/761, 430/7
• US Class Current: 349/106
• CPC Class Codes: G02F 1/133514 Colour filters

Abstract

Disclosed herein is a liquid crystal display device comprising a liquid crystal held between a pair of bases each equipped with at least a transparent electrode, and pixels each having at least four color regions which are divided from one another, wherein the four color regions in one pixel comprise a first region in which a filter for red is arranged to display a red color, a second region in which a filter for blue is arranged to display a blue color, a third region in which a filter for green is arranged to display a green color, and a fourth region in which a filter for red, a filter for blue and a filter for green are arranged to display a color.

Claims

1. A color filter substrate, comprising, on a base, first color regions each comprising a filter for red, second color regions each comprising a filter for blue, third color regions each comprising a filter for green, and fourth color regions each comprising a filter for red having an area smaller than the filter in the first color region, a filter for blue having an area smaller than the filter in the second color region and a filter for green having an area smaller than the filter in the third color region.

2. The color filter substrate according to claim 1, wherein a ratio among the area of the filter for red in the first color region, the area of the filter for blue in the second color region and the area of the filter for green in the third color region is 1:

1;

1.

3. The color filter substrate according to claim 1, wherein a ratio among the area of the filter for red, the area of the filter for blue and the area of the filter for green in the fourth color region is 1:

1;

1.

4. A liquid crystal display device comprising a liquid crystal held between a pair of bases each equipped with at least a transparent electrode, and pixels each having at least four color regions which are divided from one another, wherein the four color regions in one pixel comprise a first region in which a filter for red is arranged to display a red color, a second region in which a filter for blue is arranged to display a blue color, a third region in which a filter for green is arranged to display a green color, and a fourth region in which a filter for red, a filter for blue and a filter for green are arranged to display a color.

5. The liquid crystal display device according to claim 4, wherein regions corresponding to the red filter, blue filter and green filter in the fourth region are lighted or not lighted at the same time to display a white color.

6. The liquid crystal display device according to claim 4, wherein a ratio among the area of the first color region, the area of the second color region and the area of the third color region is 1:

1;

1.

7. The liquid crystal display device according to claim 6, wherein at least two of the first, second and third color regions are different in shape from each other.

8. The liquid crystal display device according to claim 4, wherein a ratio among the area of the filter for red corresponding to the first color region, the area of the filter for blue corresponding to the second color region and the area of the filter for green corresponding to the third color region is 1:

1;

1.

9. The liquid crystal display device according to claim 4, wherein the area of the fourth color region is smaller than any of the first, second and third color regions.

10. The liquid crystal display device according to claim 5, wherein a ratio among the area of the filter for red, the area of the filter for blue and the area of the filter for green in the fourth color region is 1:

1;

1.

11. The liquid crystal display device according to claim 4, wherein the filter for red, the filter for blue and the filter for green in the fourth color region are arranged separately from one another.

12. The liquid crystal display device according to claim 4, wherein the filter for red, the filter for blue and the filter for green in the fourth color region are arranged adjoiningly to one another, and a display is conducted only through these three color filters.

13. The liquid crystal display device according to claim 4, wherein transparent electrodes on a pair of the bases construct a simple matrix structure.

14. The liquid crystal display device according to claim 4, wherein a distance between a pair of the bases is 3 μ

m or less.

15. The liquid crystal display device according to claim 4, wherein the liquid crystal is a liquid crystal exhibiting a chiral smectic phase.

16. The liquid crystal display device according to claim 4, wherein the liquid crystal is a liquid crystal exhibiting ferroelectric characteristics.