SUBSTRATE FOR LIQUID CRYSTAL DISPLAY DEVICE, AND LIQUID CRYSTAL DISPLAY DEVICE

• US 20130083264A1
• Filed: 11/27/2012
• Published: 04/04/2013
• Est. Priority Date: 05/27/2010
• Status: Active Grant

• Current Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Original Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Inventors: Hagiwara, Hidesato, Shimizu, Mie, Fukuyoshi, Kenzo, Taguchi, Takao
• Granted Patent: US 9,285,644 B2
• Time in Patent Office: Days
• US Class Current: 349/42
• CPC Class Codes: G02B 5/201 in the form of arrays
• CPC Class Codes: G02B 5/206 comprising particles embedded in a solid matrix
• CPC Class Codes: G02F 1/133707 Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/134381 Hybrid switching mode, i.e. for applying an electric field with components parallel and orthogonal to the substrates
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence

Abstract

In a substrate for a liquid crystal display device, a black matrix, a transparent electroconductive film and a resin layer are formed above a transparent substrate. The black matrix is a light-shielding layer in which light-shielding pigments are dispersed in a resin, and includes openings. The resin layer is formed above the transparent substrate including the black matrix and the transparent electroconductive film, forms a convex part above the black matrix, and forms, in a region that passes through a center of each of the openings in the black matrix, a concave part.

Claims

1. A substrate for a liquid crystal display device, comprising:

a transparent substrate, and a black matrix, a transparent electroconductive film and a resin layer that are each formed above the transparent substrate, wherein the black matrix is a light-shielding layer in which light-shielding pigments are dispersed in a resin, and comprises openings; and

the resin layer is formed above the transparent substrate comprising the black matrix and the transparent electroconductive film, comprises a convex part above the black matrix, and comprises, in a region that passes through a center of each of the openings in the black matrix, a concave part.

2. The liquid crystal display device substrate of claim 1,

wherein the concave part is in a linear form or cross form when viewed in plan.

3. The liquid crystal display device substrate of claim 1,

wherein the transparent electroconductive film is formed to cover the black matrix and the openings, and the resin layer is formed above the transparent electroconductive film.

4. The liquid crystal display device substrate of claim 1,

wherein the transparent electroconductive film is formed above the transparent substrate, the black matrix is formed above the transparent electroconductive film, and the resin layer is formed above the transparent electroconductive film and the black matrix.

5. The liquid crystal display device substrate of claim 1,

wherein a linear convex part pattern comprising the transparent resin is formed between the transparent substrate and the transparent electroconductive film, and at the center of each of the openings in the black matrix.

6. The liquid crystal display device substrate of claim 1,

wherein a linear convex part light-shielding pattern comprising a same material as used for the black matrix is formed between the transparent substrate and the transparent electroconductive film, and at the center of each of the openings in the black matrix.

7. The liquid crystal display device substrate of claim 1,

wherein color pixels comprising at least a red pixel, a green pixel, and a blue pixel are formed in each of the openings in the black matrix, and the transparent electroconductive film is formed above the color pixels.

8. The liquid crystal display device substrate of claim 1,

wherein color pixels comprising at least a red pixel, a green pixel, and a blue pixel are formed in each of the openings in the black matrix via to interpose the transparent electroconductive film therebetween.

13. A liquid crystal display device, comprising:

the liquid crystal display device substrate of claim 1;

an array substrate which is arranged opposite to the liquid crystal display device substrate, and comprising liquid-crystal-driving elements arranged in a matrix form thereon; and

liquid crystals which are held between the liquid crystal display device substrate and the array substrate.

14. The liquid crystal display device of claim 13,

wherein the array substrate comprises a first electrode and a second electrode to which different electric potentials are applied in order to drive each rectangular pixel.

15. The liquid crystal display device of claim 14,

wherein when a voltage for driving the liquid crystals are applied to the first and second electrodes, liquid crystal molecules act to be inclined from the concave part of the resin layer into a direction which is parallel to the concave part and is a direction toward the black matrix near the liquid crystal molecules when viewed in plan.

16. The liquid crystal display device of claim 15,

wherein when a driving voltage is applied to the first electrode, and the second electrode and a third electrode, the third electrode being the transparent electroconductive film, liquid crystal molecules in each of the pixel regions of the liquid crystal display device act to be inclined into reverse directions which are linearly symmetrically to a straight line by which the pixel region is divided into two parts.

17. The liquid crystal display device of claim 14,

wherein the first electrode and/or the second electrode is/are not arranged at a position of the array substrate which corresponds to a center of a width of a pattern of the black matrix.

18. The liquid crystal display device according to claim 14,

wherein the first electrode is formed at a position other than a position which corresponds to a center of a width of a pixel line of the black matrix.

19. The liquid crystal display device of claim 14,

wherein the first electrode of the array substrate is an electrode comprises a comb-teeth pattern connected to an active element that drives the liquid crystals;

and

the second electrode which is an electrode comprising a comb-teeth pattern similar to that of the first electrode is formed below the first electrode via an insulating layer, and is protruded from an end of the first electrode into a direction along which the liquid crystals are inclined.

20. The liquid crystal display device of claim 14,

wherein the first and second electrodes each comprise electroconductive metal-oxides which is transparent in a range of visible wavelengths.

21. The liquid crystal display device of claim 13,

wherein the liquid crystals have negative dielectric constant anisotropy.

9. A substrate for a liquid crystal display device, comprising:

a transparent substrate;

a black matrix which is formed above the transparent substrate, is a light-shielding layer in which light-shielding pigments are dispersed in a resin, and comprises openings;

a transparent electroconductive film which is formed above the transparent substrate comprising the black matrix; and

color pixels having colors which are formed in each of pixel regions divided by the openings, and is formed above the transparent electroconductive film.

10. The liquid crystal display device substrate of claim 9,

wherein the black matrix comprises an inclined side surface.

11. The liquid crystal display device substrate of claim 9,

wherein respective adjacent ends of the color pixels each having the colors form an overlap part above the transparent electroconductive film and above a part corresponding to the black matrix;

a total of a film thickness of the overlap part and that of the black matrix is larger than that of each of the color pixels; and

the overlap part forms a convex part protruded from a surface of the color pixel.

12. The liquid crystal display device substrate of claim 9,

wherein the color pixel comprises, at a central part thereof, a linear concave part.

22. A liquid crystal display device, comprising:

a color filter substrate and an array substrate,

wherein the color filter substrate and the array substrate are opposed and stuck to each other via liquid crystals,

the color filter substrate comprises a black matrix having rectangular openings, a transparent electroconductive film, color pixels, and a resin layer above a transparent substrate,

the array substrate comprises elements driving the liquid crystals and being arranged in a matrix form,

the resin layer is arranged directly or indirectly above the transparent electroconductive film,

a convex part protruded from a surface of the resin layer is formed,

a convex part is formed in a region that passes through a center of each of the rectangular openings in the black matrix,

the array substrate comprises a comb-teeth-form first electrode and a comb-teeth-form second electrode each of which comprises electroconductive metal-oxides which is transparent in a range of visible wavelengths,

the second electrode is arranged below the first electrode via an insulating layer between the first and second electrodes, and

the second electrode is protruded from an end of the first electrode into a direction along which the liquid crystals are inclined.

23. The liquid crystal display device of claim 22,

wherein the concave part is in a linear form or a cross form when viewed in plan.

24. The liquid crystal display device of claim 22,

wherein two to four elements that drive the liquid crystals are arranged for each of the pixels, and the two to four elements are connected to different electrodes, respectively.