Liquid Crystal Alignment Layer and Methods of Making Thereof液晶盒內形成高預傾角之辦法
The alignment behavior of the liquid crystal layer of a liquid crystal display (LCD) determines most of its optical properties. The alignment direction and pretilt angles are determined by the alignment layers in contact with the liquid crystal layer itself and cannot be varied.
Some traditional ways to obtain high pretilt angles controllably are by oblique evaporation of SiOx in a vacuum or the use of molecular Langmuir-Bloggett films. These methods are, however, impractical for mass production.
This invention provides a novel method of obtaining controllable pretilt angles by rubbing a specially prepared alignment layer. This method can achieve any predetermined pretilt angle ranging from 10˚-80˚. It is also commensurate with traditional mass production technology which is based on mechanical rubbing. Basically, nano- and micro-domains are formed in the alignment layer. Such nano- and micro-domains contain different alignment properties. The interaction of the domains gives large pretilt angles in a controllable manner. This method can be used in a variety of applications, including but not limited to bistable display and fast display such as LCD TV.
1. High pretilt angle from 10˚-80˚
2. Higher reliability
3. More practical for mass production
4. Passively addressed supertwisted LCDs with high information content
- Fast Display: LCD TV
- Bistable LCDs
Patent Number: US7968158B2
Application Number: US2004958634A
Inventor: Kwok, Hoi-Sing | Yeung, Fion Sze Yan | Fengchao, Xie | Tsui, Ophelia Kwan Chui | Sheng, Ping
Priority Date: 24 May 2004
Priority Number: US7968158B2
Application Date: 5 Oct 2004
Publication Date: 28 Jun 2011
IPC Current: C09K001956 | B05D000506 | B05D000512 | G02F00011337 | G02F0001139
US Class: 4280012 | 349123 | 349129
Assignee Applicant: The Hong Kong University of Science & Technology
Title: Liquid crystal alignment layer and methods of making thereof
Usefulness: Liquid crystal alignment layer and methods of making thereof
Summary: For use in a liquid crystal cell to align liquid crystal molecules (claimed).
Novelty: Liquid crystal alignment layer for use in liquid crystal cell to align liquid crystal molecules, comprises horizontal alignment material providing first pretilt angle, and vertical alignment material providing second pretilt angle
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5 Oct 2004
US 10/958634
US 7968158
TTC.PA.193S
香港
