Invention Grant
- Patent Title: Liquid crystal display device
- Patent Title (中): 液晶显示装置
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Application No.: US10714816Application Date: 2003-11-17
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Publication No.: US07719646B2Publication Date: 2010-05-18
- Inventor: Kunihiro Tashiro , Katsufumi Ohmuro , Norio Sugiura , Hidefumi Yoshida
- Applicant: Kunihiro Tashiro , Katsufumi Ohmuro , Norio Sugiura , Hidefumi Yoshida
- Applicant Address: JP Osaka
- Assignee: Sharp Kabushiki Kaisha
- Current Assignee: Sharp Kabushiki Kaisha
- Current Assignee Address: JP Osaka
- Agency: Greer, Burns & Crain, Ltd
- Priority: JP2002-332601 20021115
- Main IPC: G02F1/1335
- IPC: G02F1/1335

Abstract:
A liquid crystal display device of the present invention is composed of a λ/4 plate 1, a λ/2 plate 2, and a polarizing plate 3 which are provided in this order from the side of a liquid crystal layer 10. Here, an angle formed between an absorption axis of the polarizing plate 3 and an absorption axis of the λ/2 plate 2 is about 45°, an in-plane retardation of the λ/2 plate 2 is set to a value obtained by adding λ/4 to an in-plane retardation of a retardation plate 1, desirably, the λ/4 plate 1, and an optical axis of the λ/4 plate 1 and an optical axis of the λ/2 plate 2 are orthogonal to each other. In this configuration, the optical axis of the λ/4 plate 1 is placed at 150°, the optical axis of the λ/2 plate 2 is placed at 60°, and the absorption axis of the polarizing plate 3 is placed at 15°. This configuration improves display characteristics, that is, performs bright display at a higher contrast ratio and in a wider viewing angle with less dependence on visual field, thereby realizing an excellent reflection-type liquid crystal display device that is very easy to view even in a relatively dim place such as an indoor environment.
Public/Granted literature
- US20040257506A1 Liquid crystal display device Public/Granted day:2004-12-23
Information query
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