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Bistable Twisted Nematic Liquid Crystal Displays with Twist Angle of !O 11 Degrees

A new class of bistable twisted nematic (BTN) displays is invented. Unlike the conventional BTN displays that only have zero twist or -90º twist, this new series of BTN displays can have many different twist angles. By controlling the conditions of the twist angles and the retardation of liquid crystal (LC) cell, the new technology optimizes optical properties of the LC cells such as contrast ratio, viewing brightness and viewing angle.
Technology Benefits
1. True black and white operation
2. High contrast
3. Extremely wide viewing angles
4. Large cell gap
5. Easy to man
Technology Application
- Large size liquid crystal displays (LCDs) use in public area like airports, train stations, piers, etc.
Supplementary Information
Patent Number: US6707527B1
Application Number: US2000573178A
Inventor: Kwok, Hoi Sing | Tang, Shu Tuen
Priority Date: 24 May 1999
Priority Number: US6707527B1
Application Date: 19 May 2000
Publication Date: 16 Mar 2004
IPC Current: C09K001902 | C09K001958 | G02F0001139 | G02F00011335
US Class: 349179 | 349180
Assignee Applicant: The Hong Kong University of Science & Technology
Title: Bistable twisted nematic liquid crystal displays with twist angle of ±11 degrees
Usefulness: Bistable twisted nematic liquid crystal displays with twist angle of ±11 degrees
Novelty: Bistable twisted nematic liquid crystal display has crystal doped with chirant dopant that produces natural pitch specified by formula including thickness of liquid crystal layer
Sub Category
Application Date
19 May 2000
Application No.
US 09/573178
Patent Information
US 6707527
ID No.
Hong Kong

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