Browse Prior Art Database

SCATTERING ELECTRO OPTIC CELLS

IP.com Disclosure Number: IPCOM000023685D
Original Publication Date: 1978-Oct-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 357K

Publishing Venue

Xerox Disclosure Journal

Abstract

The scattering electro-optic cells of this proposal make use of media whose refractive indices can be controlled such as, for example, liquid crystals. Liquid crystals are birefringent, and depending upon the orientation of the liquid crystal molecules, incident light sees different refractive indices. If transparent isotropic crystallites, spheres, flakes, fibers or the like are embedded in the liquid crystal and the refractive index of the embedded materials matches the index n-of the liquid crystal, no scattering will occur if the Iftolecular orientation of the liquid crystal is such that light propagates with the index n0 in the liquid crystal.

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XEROX DISCLOSURE JOURNAL

SCATTERING ELECTRO-OPTIC CELLS Proposed Classification
Werner E. L. Haas U.S. Cl. 350/160 LC
tnt. Cl. G02b 5/23

2

-4

-

FIG.,

The scattering electro-optic cells of this proposal make use
of media whose refractive indices can be controlled such as,
for example, liquid crystals.

Liquid crystals are birefringent, and depending upon the
orientation of the liquid crystal molecules, incident light
sees different refractive indices. If transparent isotropic
crystallites, spheres, flakes, fibers or the like are embedded
in the liquid crystal and the refractive index of the embedded
materials matches the index n~ of the liquid crystal, no
scattering will occur if the Iftolecular orientation of the
liquid crystal is such that light propagates with the index n0
in the liquid crystal.

If the molecular orientation of the liquid crystal is such
that incident light will propagate with two indices n~and n ,

since n does not match the index of the embedded niateria!,
scatterfng will take place.

Figure 1 generally depicts a situation with no field applied,
while Figure 2 depicts a situation with field applied. For
example, for both the Freedericksz transition and the twisted
nematic effect, at zero field the molecules 2 of layer 1 of
liquid crystal material are parallel to the substrate.
Spheres 3 of isotropic material have a refractive index
matching the index n~of the liquid crystal. Spheres 3 are
embedded in layer 1 of the liquid crystal material. Since the
liquid crystal mol...