COLOR FILTER SUBSTRATE

• US 20100245732A1
• Filed: 11/05/2008
• Published: 09/30/2010
• Est. Priority Date: 11/20/2007
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Hwang, Jong Hwi, Park, Beom Su, Cho, Chang Ho, Hong, Bog Ki, Lee, Chang Soon, Kim, Sung Hyun, Lee, Seung Hee, Kwak, Sang Kyu, Min, Kyoung Hoon, Oh, Dong Kung, Lee, Keon Woo
• Granted Patent: US 8,300,184 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: G02B 5/223 containing organic substances, e.g. dyes, inks or pigments

Abstract

A color filter substrate is provided. In the color filter substrate, transparent protective films are formed on respective sub-pixels of a color filter. The color filter substrate has improved electric field characteristics without the need for additional optical or circuit compensation to achieve an improvement in contrast and a reduction in color difference.

Claims

1. A color filter substrate comprising a color filter and transparent protective films formed on respective sub-pixels as color filter layers of the color filter wherein the difference in height between the highest point of each of the transparent protective films and a reference plane defined as the highest level of the corresponding color filter layer is not greater than 0.1 μ

m.

2. The color filter substrate according to claim 1, wherein the edges of the transparent protective film are below the reference plane.

3. The color filter substrate according to claim 2, wherein the edges of the transparent protective film are positioned at secondary inflection points of the color filter layer.

4. The color filter substrate according to claim 1, wherein the transparent protective film has a transmittance of 85% or higher.

5. The color filter substrate according to claim 1, further comprising a transparent electrode layer formed on the transparent protective film.

6. The color filter substrate according to claim 5, further comprising a liquid crystal alignment layer on the transparent electrode layer.

7. A liquid crystal display device comprising the color filter substrate according to claim 6.

8. The color filter substrate according to claim 2, further comprising a transparent electrode layer formed on the transparent protective film.

9. The color filter substrate according to claim 3, further comprising a transparent electrode layer formed on the transparent protective film.

10. The color filter substrate according to claim 4, further comprising a transparent electrode layer formed on the transparent protective film.