Liquid crystal display panel and liquid crystal display device

• US 20060103789A1
• Filed: 11/16/2005
• Published: 05/18/2006
• Est. Priority Date: 11/16/2004
• Status: Abandoned Application

• Current Assignee: NEC LCD Technologies Limited (Tianma Microelectronics Company Limited)
• Original Assignee: NEC LCD Technologies Limited (Tianma Microelectronics Company Limited)
• Inventors: Takahashi, Sounosuke, Sakaguchi, Yoshikazu
• Application Number:
  US11/274,324
• Publication Number:
  US 20060103789A1
• Time in Patent Office: Days
• US Class Current: 349/110
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]

Abstract

In a display panel of an active matrix-type liquid crystal display device in an In-Plane Switching mode, a black matrix is formed on the surface of a transparent substrate of a color-filter substrate, the surface being at a side opposed to a TFT substrate. The black matrix is made of a laminated film for which a metal oxide film and a metal film have been alternately laminated in two layers or more. The black matrix has a thickness of 0.2 μm or less and an OD value of 3 or more. Moreover, an electric-field shielding layer made of an ITO film connected to a common electrode is provided on a data line formed on the TFT substrate, via an insulating film. Furthermore, an impurity is doped in a liquid crystal layer so that resistance thereof becomes 1×10¹¹ through 1×10¹³Ω·cm.

Claims

1. A liquid crystal display panel comprising:

first and second substrates arranged so as to be opposed;

a liquid crystal layer filled between the first and second substrates;

a pixel circuit provided on a surface, of the first substrate, at a side of the liquid crystal layer, for applying a voltage to the liquid crystal layer;

a black matrix provided on a surface, of the second substrate, at a side of the liquid crystal layer, made of a laminated film for which a metal oxide film and a metal film have been alternately laminated in two layers or more, having a thickness of 0.2 μ

m or less and an optical density (OD value) of 3 or more;

a color filter provided on a surface, of the second substrate, at a side of the liquid crystal layer;

an overcoat layer provided in a manner covering the black matrix and color filter; and

a granular or columnar spacer provided on the overcoat layer on the black matrix, for holding a fixed gap between the first and second substrates,

wherein said liquid crystal display panel is mounted on an In-Plane Switching mode liquid crystal display device.

2. The liquid crystal display panel as set forth in claim 1, wherein

for the black matrix, the metal oxide film has been arranged at a side furthest from the liquid crystal layer.

3. The liquid crystal display panel as set forth in claim 2, wherein

for the black matrix, the metal oxide film has been arranged at a side closest to the liquid crystal layer.

4. The liquid crystal display panel as set forth in claim 1, wherein

the metal oxide film is a chromium oxide film, and the metal film is a chromium film.

5. The liquid crystal display panel as set forth in claim 1, wherein

the fixing-type spacer is a columnar spacer formed of a photosensitive resin.

6. The liquid crystal display panel as set forth in claim 1, further comprising

an electric-field shielding layer formed, via an insulating film, on a part of the pixel circuit, said part being at least a part of an area opposed to the black matrix.

7. The liquid crystal display panel as set forth in claim 6, wherein

said pixel circuit has a data line and a scanning line extending in mutually orthogonal directions, and the electric-field shielding layer has been formed in a manner covering at least either the data line or the scanning line.

8. The liquid crystal display panel as set forth in claim 6, wherein

said pixel circuit has a common electrode, and the electric-field shielding layer has been connected to the common electrode or a ground.

9. The liquid crystal display panel as set forth in claim 7, wherein

said pixel circuit has a data line and a scanning line extending in mutually orthogonal directions, and the electric-field shielding layer has been formed in a manner covering at least either the data line or scanning line.

10. The liquid crystal display panel as set forth in claim 6, wherein

said pixel circuit has a thin-film transistor, and the electric-field shielding layer has not been formed on the thin-film transistor.

11. The liquid crystal display panel as set forth in claim 7, wherein

said pixel circuit has a thin-film transistor, and the electric-field shielding layer has not been formed on the thin-film transistor.

12. The liquid crystal display panel as set forth in claim 8, wherein

said pixel circuit has a thin-film transistor, and the electric-field shielding layer has not been formed on the thin-film transistor.

13. The liquid crystal display panel as set forth in claim 9, wherein

said pixel circuit has a thin-film transistor, and the electric-field shielding layer has not been formed on the thin-film transistor.

14. The liquid crystal display panel as set forth in claim 7, wherein

in the liquid crystal layer, an impurity is doped so that resistance becomes 1×

10¹¹ through 1×

10¹³Ω

·

cm.

15. The liquid crystal display panel as set forth in claim 1, wherein

the black matrix has an optical density of 4 or more.

16. A liquid crystal display device comprising the liquid crystal display panel as set forth in claim 1.