Transflective liquid crystal display device and pixel electrode thereof

• US 20060164575A1
• Filed: 08/12/2005
• Published: 07/27/2006
• Est. Priority Date: 01/21/2005
• Status: Abandoned Application

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Lin, Ching-Huan, Su, Jenn-Jia, Tsai, Meng-Chang
• Application Number:
  US11/202,184
• Publication Number:
  US 20060164575A1
• Time in Patent Office: Days
• US Class Current: 349/114
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• CPC Class Codes: G02F 2201/121 common or background

Abstract

A pixel electrode of a transflective LCD device includes a transparent electrode and a reflective electrode formed on a lower substrate, and a first common electrode and a second common electrode, which are independently formed on an upper substrate and positioned at positions corresponding to the transparent electrode and the reflective electrode, respectively.

Claims

1. A pixel electrode applicable to a transflective liquid crystal display (LCD), comprising:

a transparent electrode and a reflective electrode both formed on a lower substrate; and

a first common electrode and a second common electrode, which are independently formed on an upper substrate and positioned at positions corresponding to the transparent electrode and the reflective electrode, respectively.

2. The pixel electrode according to claim 1, wherein each of the first common electrode and the second common electrode is an indium tin oxide (ITO).

3. The pixel electrode according to claim 1, wherein the transparent electrode is made of ITO, and the reflective electrode is made of aluminum.

4. The pixel electrode according to claim 1, wherein a spacing exists between the first common electrode and the second common electrode.

5. The pixel electrode according to claim 4, wherein the spacing is opposed to the reflective electrode.

6. A transflective LCD device, comprising:

a bottom board structure, which comprises

a lower substrate;

a plurality of scan lines and a plurality of data lines, both of which are arranged in an array, wherein the scan lines perpendicularly cross the data lines to define a plurality of pixel regions, each of the pixel region is defined by a pair of adjacent two of the scan lines and a pair of adjacent two of the data lines, a transparent electrode and a reflective electrode are disposed in each of the pixel regions, and the transparent electrode and the reflective electrode are formed on the lower substrate; and

a plurality of thin film transistors (TFTs), each thin film transistor being disposed in one of the pixel regions;

a top board structure, which comprises

an upper substrate; and

a first common electrode and a second common electrode, which are independently formed on the upper substrate and opposed to the transparent electrode and the reflective electrode, respectively; and

a liquid crystal layer interposed between the top board structure and the bottom board structure.

7. The LCD device according to claim 6, wherein both of the first common electrode and the second common electrode are ITOs.

8. The LCD device according to claim 6, wherein the transparent electrode is made of ITO, and the reflective electrode is made of aluminum.

9. The LCD device according to claim 6, wherein different voltages are applied to the first common electrode and the second common electrode to drive the LCD device.

10. The LCD device according to claim 6, wherein a spacing exists between the first common electrode and the second common electrode.

11. The LCD device according to claim 10, wherein the spacing is opposed to the reflective electrode.