Transflective fringe field switching liquid crystal display

• US 7,414,685 B2
• Filed: 11/24/2004
• Issued: 08/19/2008
• Est. Priority Date: 12/12/2003
• Status: Expired due to Fees

• Current Assignee: InnoLux Corporation
• Original Assignee: Innolux Display Corporation (InnoLux Corporation)
• Inventors: Yang, Chiu-Lien
• Primary Examiner(s): Nguyen; Dung T.
• Application Number:
  US10/997,666
• Publication Number:
  US 20050128389A1
• Time in Patent Office: 1,364 Days
• Field of Search: 349/141, 349113-114
• US Class Current: 349/114
• CPC Class Codes: G02F 1/133371 Cells with varying thickness of the liquid crystal layer
• 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

A liquid crystal display (2) includes: a first substrate (20); a second substrate (22); a liquid crystal layer (21) between the first substrate and the second substrate; and a plurality of pixel regions each defined by respective pixel electrodes (224) and a common electrode (222), for application of a voltage to the liquid crystal layer and formation of a fringe electric field at each pixel region. Each pixel region includes a transmissive region (R) and a reflective region (T). A thickness of the liquid crystal layer in the transmissive region is greater than a thickness of the liquid crystal layer in the reflective region.

Claims

1. A liquid crystal display comprising:

a first substrate;

a second substrate;

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

a plurality of pixel regions each defined by respective pixel electrodes and a common electrode, for application of a voltage to the liquid crystal layer and formation of a fringe electric field at each pixel region;

wherein each of the pixel regions includes a transmissive region and a reflective region, and a thickness of the liquid crystal layer at the transmissive region is greater than a thickness of the liquid crystal layer at the reflective region; and

the common electrode is made of an aluminum film, and has a transmissive area corresponding to the transmissive region and a reflective area corresponding to the reflective region, a thickness of the transmissive area is less than 100 nanometers, and a thickness of the reflective area is more than 100 nanometers.

2. The liquid crystal display of claim 1, wherein the thickness of the liquid crystal layer in the reflective region is half the thickness of the liquid crystal layer in the transmissive region.

3. A liquid crystal display comprising:

a first substrate;

a second substrate;

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

a plurality of pixel regions each defined by respective pixel electrodes and a common electrode, for application of a voltage to the liquid crystal layer and formation of a fringe electric field at each pixel region, wherein each of the pixel regions includes a transmissive region and a reflective region, and the common electrode has a plurality of transmissive areas corresponding to the transmissive regions of the pixel regions and a plurality of reflective areas corresponding to the reflective regions of the pixel regions; and

a passivation layer positioned corresponding to the reflective regions of the pixel regions, the passivation layer disposed between the first substrate and liquid crystal layer;

wherein the common electrode is made of an aluminum film, and in each of the pixel regions, a thickness of the transmissive area is less than 100 nanometers, and a thickness of the reflective area is more than 100 nanometers.