Browse Prior Art Database

NON-LINEAR BLOCKING LAYER FOR MATRIX ADDRESS DISPLAY

IP.com Disclosure Number: IPCOM000023333D
Original Publication Date: 1977-Jun-30
Included in the Prior Art Database: 2004-Mar-30
Document File: 2 page(s) / 327K

Publishing Venue

Xerox Disclosure Journal

Abstract

In matrix (X-Y) addressed display devices, the inclusion of a non-linear blocking layer between one or both electrodes and the imaging layer (for example, liquid crystalline layers, electrophoretic layers, photoelectrophoretic layers, etc.) is proposed. The non-linear blocking layer is ohmic at low fields and at some higher field value its resistance drops sharply. Phenoxy, zinc sulfide and other non-linear blocking layers are suitable.

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XEROX DISCLOSURE JOURNAL

NON-LINEAR BLOCKING LAYE:R FOR Proposed Classification
MATRIX ADDRESS DISPLAYS U.S. Cl. 350/16OLC
James E, Adams - mt. Cl. G02b 5/23
Joel M. Pollack
Simpei Tutihasi

In matrix (X-Y) addressed display devices, the inclusion of a
non-linear blocking layer between one or both electrodes and
the imaging layer (for example, liquid crystalline layers,
electrophoretic layers, photoelectrophoretic layers, etc.) is
proposed. The non-linear blocking layer is ohmic at low
fields and at some higher field value its resistance drops
sharply. Phenoxy, zinc sulfide and other non-linear blocking
layers are suitable.

In a preferred embodimeni:, the non-linear blocking material is
deposited as discrete areas at the X-Y address locations, A
sharp voltage threshold between addressed and non-addressed
areas is thereby provided resulting in an improved display.
For example, zinc sulfic~e deposited at such locations at a
thickness of about 5,000 angstroms in a liquid crystalline
electro-optic cell of about 1/2 mil thickness comprising about
90% by weight cyanobiphenyl liquid crystalline material (K-iS)
available from British Drug House, a subsidiary of Merck, and
about 10% by weight chclesteryl chloride requires about 16
volts across the liquid crystalline material at addressed
locations in order for the cholesteric to nematic phase trans-
formation to occur. Without the zinc sulfide, the same liquid
crystalline material will undergo the cholesteric to nematic
phase transformation at abo...