Transflective color liquid crystal display including color filters on transparent resists and method of fabricating a substrate therefor

• US 7,158,198 B2
• Filed: 10/28/2002
• Issued: 01/02/2007
• Est. Priority Date: 10/31/2001
• Status: Expired due to Term

• Current Assignee: Optrex Corporation (Kyocera Corporation)
• Original Assignee: Optrex Corporation (Kyocera Corporation)
• Inventors: Ozeki, Masao, Mori, Haruki, Takasaki, Ichiro
• Primary Examiner(s): CHOWDHURY, TARIFUR RASHID
• Application Number:
  US10/281,108
• Publication Number:
  US 20030090610A1
• Time in Patent Office: 1,527 Days
• Field of Search: 349/106, 349/113, 349/114
• US Class Current: 349/114
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133555 Transflectors

Abstract

A transparent resist 13 having a certain thickness is provided on a full reflection film 11a at light reflection portions 11, and light reflection portions 12 are formed as holes having a certain depth, when one of the substrates 10 has an inner surface provided with the light reflection portions 11 made of the full reflection film 11a and the light transmission portions 12 formed as openings without the full reflection layer, and a color filter 14 is provided on each paired light reflection portion 11 and light transmission portion 12.

Claims

1. A transflective color liquid crystal display comprising:

a transparent substrate having an inner surface; and

first, second and third color filter elements arranged in a row, disposed on the inner surface, each forming a full reflection portion and a light transmission portion, each of the color filter elements including,

a respective color filter,

a transparent photoresist, and

a reflection layer,

wherein each color filter has a portion disposed on the transparent photoresist and on the respective reflection layer to form the full reflection portion, and another portion of the color filter is disposed on the respective transparent substrate to form the light transmission portion, such that a first light reflected by the reflection layer is transmitted through the transparent photoresist and the color filter in the full reflection portion, and such that a second light is transmitted through the light transmission portion, and

wherein a color filter at the light transmission portion has a thickness 2.2 to 4.5 times a thickness of a color filter at the full reflection portion.

2. The liquid crystal display according to claim 1, further comprising:

an upper substrate; and

a TN liquid crystal layer arranged between the transparent and upper substrates.

3. The liquid crystal display according to claim 1, further comprising:

an upper substrate; and

an STN liquid crystal layer arranged between the transparent substrate and the upper substrate.

4. The liquid crystal display according to claim 1, wherein the color filter elements comprise a red filter, a blue filter, and a green filter.

5. The liquid crystal display according to claim 1, wherein the first color filter element comprises one of a red filter, a blue filter, and a green filter.

6. The liquid crystal display according to claim 1, wherein at least one of said color filter elements comprises a rectangle in a substrate plane.

7. The liquid crystal display according to claim 1, wherein said reflection layers comprise Ag.

8. The liquid crystal display according to claim 1, wherein the color filters contact one another.

9. The liquid crystal display according to claim 8, wherein the first, second, and third color filter elements each comprise a different one of a red filter, a blue filter, and a green filter.

10. The transflective color liquid crystal display according to claim 1,

wherein the full reflection portion of the second color filter element is disposed adjacent the first color filter element, and the transmission portion of the second color filter element is disposed adjacent the third color filter element.

11. The liquid crystal display according to claim 10, wherein the full reflection portion of the second color filter element contacts the light transmission portion of the third color filter element, and the light transmission portion of the second color filter element contacts the full reflection portion of the first color filter element.

12. The liquid crystal display according to claim 1, wherein the full reflection portions and the light transmission portions of adjacent filter elements are arranged next to each other.

13. The liquid crystal display according to claim 1, wherein the first light and the second light having a substantially similar color gamut and which are able to be seen at a same time.

14. A transflective color liquid crystal display comprising:

a transparent substrate having an inner surface; and

first, second and third color filter elements disposed on the inner surface, each forming full reflection portions and light transmission portions, each of the filter elements including,

a respective color filter,

a transparent photoresist, and

a reflection layer,

wherein each color filter has a portion disposed on the respective transparent photoresist and the respective reflection layer to form the full reflection portion, and another portion of the color filter is disposed on the respective transparent substrate to form the light transmission portion, such that a light reflected by the reflection layer is transmitted through the transparent photoresist and the portion of the color filter in the light reflection portion,

wherein a color filter at the light transmission portion has a thickness 2.2 to 4.5 times a thickness of a color filter at the full reflection portion.