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Enhancing Optical Performance of ChLCDs through Drive Innovations

IP.com Disclosure Number: IPCOM000008287D
Publication Date: 2002-Jun-03
Document File: 1 page(s) / 33K

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6,154,190: PATENT [+2]

Abstract

Abstract: This paper demonstrates how by using what is taught in United States Patents #6,154,190 Dynamic Drive Methods & Apparatus for a Bistable Liquid Crystal Display, Yang, Zhu,Huang as well as, 5,748,277 Dynamic Drive Method & Apparatus for a Bistable Liquid Crystal Display, Huang, Bos, Yang , a Cholesteric LCD cell spacing can be increased, improving optical performance, without the significant reduction in update speeds associated with larger cell gaps.

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Enhancing Optical Performance of ChLCDs through Drive Innovations

Abstract: This paper demonstrates  how by using what is taught in United States Patents #6,154,190 Dynamic Drive Methods & Apparatus for a Bistable Liquid Crystal Display, Yang, Zhu,Huang  as well as, 5,748,277 Dynamic Drive Method & Apparatus for a Bistable Liquid Crystal Display, Huang, Bos, Yang , a Cholesteric LCD cell spacing can be increased, improving optical performance, without the significant reduction in update speeds associated with larger cell gaps.

The afore mentioned patents teach how to, among other things, dramatically increase update speeds of bi-stable cholesteric displays by implementing the novel driving method described in those patents as well as drive methods that can be constructed from using variations of the described approach. Yet a  little know additional benefit that can be derived from utilizing the Dynamic Drive is that it allows one to increase LCD cell gaps considerably without any significant lose in operating speed while driving at the same voltages.

As an example of how the Dynamic Drive can increase optical performance while also accomplishing its main purpose of improving update speed consider the following.   A typical Cholesteric LCD with a 5micron spacing utilizing a conventional drive scheme at 45 volts, can update a row at approximately 6 milliseconds at room temperature. That same cell utilizing a Dynamic Drive scheme can update a row in 1.5 milliseconds.

Increasing this...