Browse Prior Art Database

Liquid Crystal Display Structure

IP.com Disclosure Number: IPCOM000121474D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 3 page(s) / 62K

Publishing Venue

IBM

Related People

Matino, H: AUTHOR

Abstract

Disclosed is a structure of polymer dispersed liquid crystal panel with inhomogeneous optical scattering properties, which is obtained by different liquid crystal particle size dispersed in polymer layers.

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Liquid Crystal Display Structure

      Disclosed is a structure of polymer dispersed liquid
crystal panel with inhomogeneous optical scattering properties, which
is obtained by different liquid crystal particle size dispersed in
polymer layers.

      Light scattering is dependent upon particle size a in radius
and wavelength g.
 (1) When a =g, scattering efficiency is maximum. Scattering is
anisotropic and scattering to the front-half is much greater than
that of the back-half.  This means most of the light is scattered to
the direction of incident light.
 (2) When 2fa/g<< 1, scattering is isotropic.  Also efficiency is
lower than that of case 1.

      Fig. 1 shows the structure of transmissive PDLC with two layers
L1 and L2 of different scattering properties.  In L1, liquid crystal
particle size is nearly equal to wavelength.  In L2, particle size is
smaller than wavelength.  External light (1-7) comes from outside and
is reflected on antireflection coating layer (1-6) partially. Light
through glass would be reflected and scattered in L1. If scattering
is isotropic, reflected light causes glare to eyes.

      When 2a1=g, most of the scattered light would be transmitted to
L2 layer and not enough is reflected.  At off-state coming light
would scattered in L2 isotropically and could be shut in L2.  At
on-state, light could be transmitted in L2 and L1 without scattering.

      Thickness of L1 could be smaller than that of L2.  Also L1 and
L2...