Transreflective liquid crystal display panel having a wide viewing angle

• US 7,362,400 B2
• Filed: 09/29/2004
• Issued: 04/22/2008
• Est. Priority Date: 09/29/2003
• Status: Expired due to Fees

• Current Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: Abe, Makoto, Itou, Osamu
• Primary Examiner(s): QI, ZHI QIANG
• Application Number:
  US10/953,590
• Publication Number:
  US 20050105033A1
• Time in Patent Office: 1,301 Days
• Field of Search: 349/141, 349/114, 349/146
• 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 transreflective liquid crystal display panel comprising a first substrate and a second substrate between which plural pixels are formed, a liquid crystal layer disposed between said first substrate and said second substrate, 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 electrodes each of which is electrically connected to said driving means and disposed between two of said common electrodes, wherein

said common electrodes and said pixel electrode are formed over said second substrate and have slope surfaces around pattern edges thereof tilting against said second substrate, on which incident light passing through said first substrate and said liquid crystal layer reflects

wherein voltage is applied through said driving means between said common electrode and said pixel electrode to drive said orientation of said liquid crystal therebetween, and

wherein each of said pixel electrodes and said common electrodes is bent to form a smooth curved shape against said second substrate when viewed from a plan view.

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

wherein said driving means is composed of a thin film transistor.

4. A transreflective 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.

5. A transreflective 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.

6. A transreflective liquid crystal display panel according to claim 5,

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

7. A transreflective 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 and not the same shape and not the same curvature within said pixel.

8. A transreflective liquid crystal display panel according to claim 1,

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

9. A transreflective liquid crystal display panel according to claim 8,

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