Reflective cholesteric displays without using Bragg reflection

Details Reflective cholesteric displays without using Bragg reflection Reflective cholesteric displays without using Bragg reflection

2005-03-29

2005-03-29

Ton, Toan (Department: 2871)

Liquid crystal cells, elements and systems

With specified nonchemical characteristic of liquid crystal...

Within cholesteric phase

C349S096000, C349S113000

Reexamination Certificate

active

06873393

ABSTRACT:
This invention relates to reflective cholesteric displays without using Bragg reflection. The helical pitch of the cholesteric liquid crystals may or may not be tuned in a visible wavelength, but its Bragg reflection will never be displayed. An elliptical polarizer with properly designed retardation and lamination positioned at the front of the display will be able to eliminate the Bragg reflection over a large viewing cone. The function of the display cell structure is merely a light shutter to switch the incident light ON and OFF. In the black-and-white display mode, the white state is achieved from the metal reflection in the cholesteric planar texture area; and the black state is obtained by cholesteric's depolarization effect and polarizer's filtration effect in the cholesteric focal conic texture area. In the full color mode, the full color state is created by the metal reflector and the micro-color filter in the cholesteric planar texture area; and the black state is realized in the cholesteric focal conic texture area. The reflective cholesteric display, remaining its long-term bistability but not applying the narrow-band Bragg reflection, initiates novel displays with a neutral wide-band reflection.

REFERENCES:
patent: 6344887 (2002-02-01), Ma et al.
patent: 6462805 (2002-10-01), Wu et al.
patent: 20030160923 (2003-08-01), Ma

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