Liquid crystal display device and production method thereof

• US 20060267969A1
• Filed: 05/24/2006
• Published: 11/30/2006
• Est. Priority Date: 05/26/2005
• Status: Active Grant

• Current Assignee: Japan Display Central Incorporated (Japan Display Incorporated)
• Original Assignee: Toshiba Matsushita Display Technology Co Ltd (Japan Display Incorporated)
• Inventors: Nagata, Hiroyuki, Nakao, Norihisa, Hamamoto, Minako, Yamamoto, Takeshi, Shohara, Kiyoshi, Doi, Takashi
• Granted Patent: US 7,884,900 B2
• Time in Patent Office: Days
• US Class Current: 345/204
• CPC Class Codes: G02F 1/133388 with constructional differences between the display region and the peripheral region
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• 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 1/1339 Gaskets; Spacers; Sealing of cells

Abstract

A color filter layer is formed on a glass substrate of a counter substrate. A bank pattern is formed of the same material as a red color-filter portion, a green color filter portion and a blue color filter portion of the color filter layer at the outside of the color filter layer on the glass substrate in the same step. A light shielding material is coated in a bank between the bank pattern and the color filter layer to form a light shielding layer. The light shielding layer can be formed so as to be continuous with the peripheral edge of the color filter layer. The light shielding layer is less likely to overlap with the inside of a display frame portion of the liquid crystal panel, and the aperture ratio is less likely to be reduced. The number of manufacturing steps of the light shielding layer is reduced.

Claims

1. A method of producing a liquid crystal display device comprising, on a light transmissible substrate, pixels that are arranged in a display area for displaying an image and have a color filter layer including colored layers of a plurality of colors, and a light shielding layer for light-shielding a light shielded area arranged along the outer periphery of the display area, wherein

a dam pattern is formed at the peripheral edge of the color filter layer by material used for the color filter layer when the color filter layer is formed on the light transmissible substrate;

and

a light shielding material is coated at the peripheral edge of the color filter and dammed by the dam pattern, whereby the light shielding layer is formed so as to surround the outer periphery of the color filter layer.

2. The liquid crystal display device producing method according to claim 1, wherein the light shielding material is coated by ink jet to form the light shielding layer.

3. The liquid crystal display device producing method according to claim 1, wherein

when the color filter layer is successively formed of the colored layers of a plurality of colors, the colored layer located at the outermost side of the color filter layer and the dam pattern are formed by laminating the colored layers of different colors;

and

the light shielding material is injected between the colored layer located at the outermost side of the color filter layer thus laminated and the dam pattern.

4. The liquid crystal display device producing method according to claim 1, wherein

when the color filter layer is formed of the colored layers of a plurality of colors, a first color filter layer and a pair of partition wall lower stage portions that are disposed so as to be spaced from each other at a predetermined interval and surround the outer periphery of the display area in the light shielded area, and that constitute a part of the dam pattern are formed of a first colored resin of a first color, and a second color filter layer and a partition wall upper stage portion serving as the other portion of the dam pattern on the upper surface of at least the partition wall lower stage portion at the inner peripheral side of the pair of partition wall lower stage portions are formed of a second colored resin of a second color;

and

when the light shielding layer is formed, ink having the light shielding material is dropped from an ink jet nozzle onto the upper surface of the light transmissible substrate between the pair of partition wall lower stage portions.

5. The liquid crystal display device producing method according to claim 1, wherein

when the color filter layer is formed of the colored layers of a plurality of colors, a first color filter layer and a pair of partition wall lower stage portions that are disposed so as to be spaced from each other at a predetermined interval and surround the outer periphery of the display area in the light shielded area, and that constitute a part of the dam pattern are formed of a first colored resin of a first color, a second color filter layer and a partition wall upper stage portion that has a groove along the partition wall concerned and serves as the other portion of the dam pattern on the upper surface of at least the partition wall lower stage portion at the inner peripheral side of the pair of partition wall lower stage portions are formed of a second colored resin of a second color;

and

when the light shielding layer is formed, ink having the light shielding material is dropped from an ink jet nozzle onto the upper surface of the light transmissible substrate between the pair of partition wall lower stage portions.

6. The liquid crystal display device producing method according to claim 5, wherein the distance from the jetting port of the ink jet nozzle to the upper end of the partition wall upper stage portion is set to 60 μ

m to 90 μ

m when ink is dropped from the ink jet nozzle.

7. The liquid crystal display device producing method according to claim 1, wherein

the dam pattern is a pair of partition walls that are disposed so as to be spaced from each other at a predetermined interval and surround the outer periphery of the display area in the light shielded area, and the side surfaces of which are designed as tapered surfaces;

and

when the light shielding layer is formed, ink having the light shielding resin material is dropped from the ink jet nozzle onto the upper surface of the light transmissible substrate between the pair of partition walls.

8. The liquid crystal display device producing method according to claim 1, wherein the light transmissible substrate is an array substrate having switching elements arranged in a matrix form and pixel electrodes connected to the switching elements.

9. A liquid crystal display device comprising, on a light transmissible substrate, pixels having a color filter layer arranged in a display areas for displaying an image and a light shielding portion for light-shielding a light shielded area arranged along the outer periphery of the display area, wherein

the light shielding portion includes:

a dam pattern formed at t-he peripheral edge of the color filter layer; and

a light shielding layer that is formed by damming light shielding material coated on the light transmissible substrate at the peripheral edge of the color filter layer by the dam pattern, and that surrounds the outer periphery of the color filter layer.

10. The liquid crystal display device according to claim 9, wherein the light shielding layer is formed by coating the light shielding material between the peripheral edge of the color filter layer and the dam pattern.

11. The liquid crystal display device according to claim 9, wherein

the dam pattern is a pair of partition walls that are disposed so as to be spaced from each other at a predetermined interval and surround the outer periphery of the display area in the light shielded area, and that is formed of colored resin to form the color filter layer;

and

the light shielding layer is formed by coating the light shielding material between the pair of partition walls.

12. The liquid crystal display device according to claim 11, wherein the colored resin forming the color filter layer comprises colored resins of a plurality of colors, and at least the partition wall at the inner peripheral side of the pair of partition walls is formed by laminating colored resin of any two colors of the colored resins of the plurality of colors.

13. The liquid crystal display device according to claim 12, wherein the pair of partition walls is formed of green resin and blue resin.

14. The liquid crystal display device according to claim 11, wherein the line width of the pair of partition walls is equal to 20 μ

m or more.

15. The liquid crystal display device according to claim 9, wherein the light transmissible substrate is an array substrate equipped with switching elements arranged in a matrix form, and pixel electrodes connected to the switching elements.

16. The liquid crystal display device according to claim 11, wherein a groove is formed, on the upper surface of at least the partition wall at the inner peripheral side out of the pair of partition walls, along the partition wall concerned.

17. The liquid crystal display device according to claim 16, wherein

the colored resin forming the color filter layer comprises colored resins of a plurality of colors;

and

at least the partition wall at the inner peripheral side out of the pair of partition walls is formed by laminating colored resin of any two colors out of the colored resins of the plurality of colors in a two-stage structure of upper and lower states, and a groove is formed on the upper surface of the upper stage portion along the partition wall concerned.

18. The liquid crystal display device according to claim 16, wherein the side surfaces of the upper end portions of the pair of partition walls are designed to have tapered surfaces so that the width of the partition walls is varied toward the upper ends thereof.

19. The liquid crystal display device according to claim 16, wherein

the colored resin forming the color filter layer comprises colored resins of a plurality of colors;

the pair of partition walls are formed by laminating colored resin of at least any one color of the colored resins of the plurality of colors; and

the side surfaces of the upper end portions of the pair of partition walls are designed to have tapered surfaces so that the width of the partition walls is varied toward the upper ends thereof.

20. The liquid crystal display device according to claim 9, wherein the colored resin is photocurable resin.

21. The liquid crystal display device according to claim 9, wherein the light shielding, resin is any one of thermosetting resin and photocurable resin.