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Method and Apparatus for Driving Reflective Bistable Cholestric Displays

Summary: This is about a new scheme for driving reflective bistable cholesteric displays (BCDs). It relies on fast switching from the planar state to the focal conic (FC) state, the two stable states in BCDs. The new scheme allows BCDs be driven using simpler electrical wave forms, and also making line addressing speed faster. Conventional BCDs have the problems of requiring high voltage, being relatively slow in scanning, requiring more complicated wave forms and drive electronics, the contrast ratio of the dynamic driving scheme being very sensitive to the amplitude of the evolution voltage, requiring specially aligned BCDs, or being slow in switching.

Technology Benefits: 1. No power consumption in refreshing display
2. Fast switching between planar and focal conic states
3. Simpler electrical wave forms
4. Easy to manufacture

Technology Application: - Displays used in pagers, cellular phones, personal data banks, and so on

Supplementary Information: Patent Number: US8508448B2
Application Number: US2005267600A
Inventor: Kwok, Hoi-Sing | Yu, Fei-Hong | Li, Qing-Cheng | Yip, Wing-Chiu
Priority Date: 1 May 1998
Priority Number: US8508448B2
Application Date: 7 Nov 2005
Publication Date: 13 Aug 2013
IPC Current: G09G000336 | C09K001902 | G02F00011335 | G02F0001137
US Class: 345087 | 349115 | 349185
Assignee Applicant: The Hong Kong University of Science & Technology
Title: Method and apparatus for driving reflective bistable cholestric displays
Usefulness: Method and apparatus for driving reflective bistable cholestric displays
Summary: Bistable cholesteric liquid crystal display (LCD) is used in pagers, cellular phones, personal data banks, etc.
Novelty: Bistable cholesteric liquid crystal display in cellular phones, supplies initial voltage to set all pixels to reflective planar state and supplies sufficient voltage to selected pixels to switch selected pixels to focal conic state

Industry: Electronics

Sub Category: 3C/Gadgets

Application Date: 7 Nov 2005

Application No.: US 11/267600

Patent Information: US 8508448

ID No.: TTC.PA.069

Country/Region: Hong Kong

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