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Bistable Liquid Crystal Device雙穩態液晶顯示器

A new bistable liquid crystal display (LCD) is invented. It has many advantages over existing bistable LCDs, such as low voltage operation, permanent bistability, and fast switching. It can be used in smart cards and in low power applications.

LCDs that are truly bistable under zero voltage bias are desirable for many practical applications. This new bistable LCD has two stable states under zero voltage bias conditions - bend deformation state and splay deformation state. The bend and splay states may also have a small twist deformation as well. The bistable elastic deformation condition employed can exist if the pretilt angle of the liquid crystal molecules is large enough. The display can be switched by specially shaped electrical pulse, or by the application of horizontal and vertical electric fields. This new type of bistable LCD may have better viewing angle, better contrast ratios, faster selection and lower operating voltages than other bistable displays based on twisted nematic effect.
Technology Benefits
1. Novel
2. Low voltage operation
3. Permanent bistability
4. Fast switching
5. Better viewing angle
6. Better contrast ratios
Technology Application
- Bistable liquid crystal display (LCD) for use in display industry, especially for smart cards
Supplementary Information
Patent Number: US7557884B2
Application Number: US2003572086A
Inventor: Kwok, Hoi-Sing | Yu, Xing Jie
Priority Date: 23 Oct 2003
Priority Number: US7557884B2
Application Date: 16 Mar 2006
Publication Date: 7 Jul 2009
IPC Current: G02F00011337 | G02F0001133 | G02F0001139 | G02F0001141 | G02F00011343
US Class: 349123 | 349124 | 349128 | 349136
Assignee Applicant: The Hong Kong University of Science & Technology
Title: Bistable liquid crystal device
Usefulness: Bistable liquid crystal device
Summary: Bistable bend-splay liquid crystal device such as super twisted nematic (STN) LCD.
Novelty: Bitstable bend-splay LCD e.g. super twisted nematic LCD, includes liquid crystal layer having liquid crystal molecules that are in contact with alignment layers and pretilted at specified angles with respect to alignment layer
Sub Category
Application Date
16 Mar 2006
Application No.
US 10/572086
Patent Information
US 7557884
ID No.
Hong Kong

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