Color filter array panel and liquid crystal display including the same

• US 20050030448A1
• Filed: 07/02/2004
• Published: 02/10/2005
• Est. Priority Date: 07/02/2003
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Lee, Sang-Hun, Huh, Chul, Kim, Kwang-Ho, Kim, Byoung-Joo
• Granted Patent: US 7,342,620 B2
• Time in Patent Office: Days
• US Class Current: 349/106
• CPC Class Codes: G02B 5/201 in the form of arrays
• CPC Class Codes: G02F 1/133514 Colour filters

Abstract

In a color filter array panel that includes a plurality of red, green and blue color filters for a plurality of red, green and blue pixels, respectively, the blue pixels have a higher contrast ratio than the red pixels and the green pixels. A liquid crystal display utilizing the color filter array panel may be used as a monitor and as a television set as it meets the required display characteristics of both.

Claims

1. A color filter array panel, comprising:

a red filter for a red pixel;

a green filter for a green pixel; and

a blue filter for a blue pixel;

wherein the blue pixel shows a higher contrast ratio than the red pixel and the green pixel.

2. The color filter array panel of claim 1, wherein the blue pixel contrast ratio is greater than 1,000.

3. The color filter array panel of claim 2, wherein the blue pixel contrast ratio is greater than 1,200 and also greater than twice the red pixel contrast ratio.

4. The color filter array panel of claim 1, wherein average size of pigment particles in the blue color filter is about 120-180 nm.

5. A liquid crystal display (LCD), comprising:

a first substrate,

a second substrate,

a liquid crystal layer interposed between the first substrate and the second substrate,

wherein the second substrate further comprises;

a red filter for a red pixel;

a green filter for a green pixel; and

a blue filter for a blue pixel;

wherein the blue pixel has a contrast ratio higher than any other colored pixels.

6. The LCD of claim 5, wherein the blue pixel contrast ratio is greater than 1,000.

7. The LCD of claim 6, wherein the blue pixel contrast ratio is greater than 1,200.

8. The LCD of claim 7, wherein the blue pixel contrast ratio is greater than twice the red pixel contrast ratio.

9. The LCD of claim 5, wherein the average size of the pigment particles in the blue color filters is about 120-180 mm.

10. The LCD of claim 5, wherein the LCD is a patterned vertically aligned LCD.

11. A method for manufacturing liquid crystal display color filters, comprising the steps of:

coating a layer containing blue pigments on an insulating substrate; and

patterning the layer to form a color filter,

wherein the blue pigments have an average particle size of 120-180 nm.

12. The method of claim 11, wherein the layer is a photosensitive film.

13. The method of claim 11, wherein the insulating substrate is a color filter substrate.

14. The method of claim 11, wherein the insulating substrate is a thin film transistor array substrate.

15. A method for manufacturing a liquid crystal display, comprising:

forming a thin film transistor array substrate; and

forming a color filter layer comprising blue pigments,

wherein the blue pigments have average particle size of 120-180 nm.

16. The method of claim 15, wherein the thin film transistor array substrate is formed by photolithography using four masks.

17. The method of claim 16, wherein the color filter layer is formed on the thin film transistor array substrate.

18. The method of claim 16, wherein the color filter layer is formed on a substrate other than the thin film transistor array substrate.

19. The method of claim 16, wherein a blue pixel contrast ratio is greater than twice a red pixel contrast ratio.

20. The method of claim 15, wherein a blue pixel contrast ratio is greater than 1,000.