Liquid crystal display panel

• US 20050105033A1
• Filed: 09/29/2004
• Published: 05/19/2005
• Est. Priority Date: 09/29/2003
• Status: Active Grant

• Current Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: Abe, Makoto, Itou, Osamu
• Granted Patent: US 7,362,400 B2
• Time in Patent Office: Days
• US Class Current: 349/141
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]

Abstract

The comb like electrodes to drive the orientation of the liquid crystal through the lateral electric field in the IPS (In plane Switching) LCD panel has a construction that the comb like electrodes are optically reflective, are projections in the gap area and have curved surfaces in the cross section of the electors.

Claims

1. A liquid crystal display panel comprising at least a first substrate a second substrate between which plural pixels are formed, each of said pixels including a liquid crystal layer, a driving means to drive orientation of liquid crystal of said liquid crystal layer, common electrodes commonly connected to a voltage supply and a pixel electrode electrically connected to said driving means by which voltage is applied to said liquid crystal of said liquid crystal layer, wherein

said common electrodes and said pixel electrode which is placed between two of said common electrodes are formed above said second substrate and have slope surfaces around pattern edges thereof tilting against said second substrate.

2. A liquid crystal display panel according to claim 1, wherein

said pixel electrodes are connected to signal lines trough a via hole and said driving means wherein said signal lines are vertical to scanning lines.

3. A liquid crystal display panel according to claim 1, wherein

said driving means is composed of a thin film transistor.

4. A liquid crystal display panel according to claim 1, wherein

each electrode of said pixel electrodes and said common electrodes has four different normal directions against said slope surfaces.

5. A liquid crystal display panel according to claim 1, wherein

each electrode of said pixel electrodes and said common electrodes has curved slope surfaces which tilt against said second substrate.

6. A liquid crystal display panel according to claim 1, wherein

contour lines of each electrode of said pixel electrodes and said common electrodes have additional micro pattern contours therearound.

7. A liquid crystal display panel according to claim 1, wherein

a segment of said pixel electrodes and a segment of said common electrodes which correspond to said pixels are not in parallel within said pixel.

8. A liquid crystal display panel according to claim 6, wherein

said additional micro pattern contours are formed non-periodically in contour lines of each electrode of said pixel electrodes and said common electrodes.

9. A liquid crystal display panel according to claim 1, wherein

said pixel electrodes and said common electrodes have a corrugated surface thereon.

10. A liquid crystal display panel according to claim 9, wherein

corrugation of said corrugated surface of said pixel electrodes and said common electrodes are non-periodically formed.

11. A liquid crystal display panel, wherein

a first phase plate and a first polarizer are formed on said first substrate in an order of surface thereof,

a second phase plate, a third phase plate and a second polarizer are formed on said second substrate in an order of surface thereof, transmitting axes of said first and said second polarizers are mutually orthogonal, delay axes of said first phase plate and said third phase plate are mutually orthogonal, delay axis of said second phase plate and orientation direction of said liquid crystal layer are mutually orthogonal, retardations of said first phase plate and said third phase plate equal each other,

a retardation of said second phase plate and a retardation of a liquid crystal layer of a transmissive portion,

NZ number of said second phase plate is zero, and

either one of said first phase plate Nz number or said third phase plate Nz number is unity and the other Nz is zero.