Liquid crystal display device

• US 20030184693A1
• Filed: 03/26/2003
• Published: 10/02/2003
• Est. Priority Date: 03/28/2002
• Status: Active Grant

• Current Assignee: NLT Technologies, Ltd.
• Original Assignee: NEC Corporation
• Inventors: Kadotani, Tsutomu, Kuroha, Shoichi
• Granted Patent: US 6,937,312 B2
• Time in Patent Office: Days
• US Class Current: 349/110
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]

Abstract

A black matrix layer 14 is formed on a counter substrate 13 along the direction where a scanning line 2 extends, so that it continuously covers the upper parts of a common electrode line 3a, the scanning line 2, a space between the common electrode line 3a and the scanning line 2, a TFT 5, a space between the scanning line 2 and a common electrode line 3b, and the common electrode line 3b, and in the portion opposed to the signal line, the black matrix layer is eliminated.

Claims

1. A liquid crystal display device, comprising:

an active matrix substrate having a switching element, a pixel electrode and a first and second common electrode,

said switching element being arranged in the vicinity of a crossing portion of a scanning line and a signal line,

said pixel electrode being connected to said switching element,said common electrode being arranged so as to generate a lateral electric field between said pixel electrode and said common electrode;

a counter substrate opposed to said active matrix substrate being provided with a black matrix layer; and

a liquid crystal disposed between said active matrix substrate,

wherein said black matrix layer is extended along an extending direction of said scanning line without overlapping a regin between said first common electrode line and said second common electrode line.

2. The liquid crystal display device according to claim 1, wherein said pixel electrode and said common electrode have a shape curbed odd number of times within one picture element and said signal line has a shape in which the portion adjoining at least to either one of said pixel electrode and said common electrode is curbed odd number of times.

3. The liquid crystal display device according to claim 1, wherein said signal line comprises a wide width portion in the portion adjoining to said pixel electrode.

4. The liquid crystal display device according to claim 2, wherein said signal line comprises a wide width portion in the portion adjoining to said pixel electrode.

5. The liquid crystal display device according to claim 1, wherein said counter substrate includes a plurality of color layers in which end portions are mutually superposed by adjoining picture elements.

6. The liquid crystal display device according to claim 5, wherein said color superposing region is arranged above the signal line of the active matrix substrate.

7. The liquid crystal display device according to claim 2, wherein said counter substrate includes a plurality of color layers in which end portions are mutually superposed by adjoining picture elements.

8. The liquid crystal display device according to claim 7, wherein said color superposing region is arranged above the signal line of the active matrix substrate.