Transflective liquid crystal display device with balanced color purity

• US 7,206,046 B2
• Filed: 09/17/2003
• Issued: 04/17/2007
• Est. Priority Date: 09/19/2002
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Tsai, Ching-Yu, Ko, Fu-Jen
• Primary Examiner(s): TON, MINH TOAN T
• Application Number:
  US10/663,678
• Publication Number:
  US 20040056999A1
• Time in Patent Office: 1,308 Days
• Field of Search: 349/114, 349/106
• US Class Current: 349/114
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133555 Transflectors

Abstract

A transflective LCD device. The device includes a first color filter on a first substrate, and a reflective electrode on the first color filter. The reflective electrode has an opaque portion and a transparent portion. A second color filter is formed on an inner side of a second substrate opposite the first substrate. A common electrode is on the second color filter, and a liquid crystal layer is between the first and the second substrates. Another transflective LCD device is provided, including a first color filter on a first substrate, a reflective layer on part of the first color filter, a second color filter on the reflective layer and the first color filter, a transparent electrode on the second color filter, and a common electrode on an inner side of a second substrate opposite the first substrate.

Claims

1. A transflective liquid crystal display device, comprising:

a first substrate and a second substrate opposite thereto;

a first color filter on the first substrate;

a reflective layer on part of the first color filter;

a second color filter on the reflective layer and the first color filter;

a transparent electrode on the second color filter;

a common electrode on an inner side of the second substrate; and

a liquid crystal layer between the first substrate and the second substrate.

2. The transflective LCD device according to claim 1, wherein the first substrate is a substrate comprising a thin film transistor (TFT) array.

3. The transflective LCD device according to claim 1, wherein the reflective layer is an aluminum layer having an uneven surface.

4. The transflective LCD device according to claim 1, wherein the transparent portion of the transparent electrode is an ITO (indium tin oxide) or IZO (indium zinc oxide) layer.

5. The transflective LCD device according to claim 1, wherein partial surfaces of the first color filter have, bumps.

6. The transflective LCD device according to claim 1, wherein the second color filter comprises openings corresponding the portion of the first color filter uncovered by the reflective layer.