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A Liquid Crystal Alignment Layer and Methods of Making Thereof液晶盒內形成高預傾角之辦法

Summary

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.

Technology Benefits

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

Technology Application

- Fast Display: LCD TV
- Bistable LCDs

Supplementary Information

Patent Number: HK1102337A1
Application Number: HK2007110470A
Inventor: KWOK HOI-SING | YEUNG FION SZE YAN | XIE FENGCHAO | TSUI OPHELIA KWAN CHUI | SHENG PING
Priority Date: 24 May 2004
Priority Number: HK1102337A1
Application Date: 27 Sep 2007
Publication Date: 8 May 2009
IPC Current: B05D000506 | B05D000512 | G02F00011337 | G02F0001139
Assignee Applicant: The Hong Kong University of Science & Technology
Title: A LIQUID CRYSTAL ALIGNMENT LAYER AND METHODS OF MAKING THEREOF
Usefulness: A LIQUID CRYSTAL ALIGNMENT LAYER AND METHODS OF MAKING THEREOF

Industry

Chemical/Material

Sub Category

Chemical/Material Application

Application Date

27 Sep 2007

Application No.

Hong Kong 07110470.1

Patent Information

Hong Kong HK1102337

ID No.

TTC.PA.193S

Country/Region

Hong Kong