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AMBIENT LIGHT VIDEO DISPLAY

IP.com Disclosure Number: IPCOM000023030D
Original Publication Date: 1976-Jul-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 243K

Publishing Venue

Xerox Disclosure Journal

Abstract

The ambient light video display 10 comprises a video tube with a multi~layered Lace plate in place of the conven~ tional phosphor coated glass. The face plate comprises a thin conducting layer 1, a white low conductivity charge capture layer 2, an electri~ cal fie1d~-sensitive layer 3, and a transparent electrode 4 such as NESA glass or other suitable transparent conduc~ tive layer on a transparent substrate, ~Then a beam of sufficiently energetic electrons strikes the thin conducting layer 1, most of the electrons will penetrate a considerable distance into the low conductivity layer 2, This produces an electrical field across the electrical field-~sensitive layer 3 which is proportional to the charge density and its relative distance from thin conducting layer 1.

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XEROX DISCLOSURE JOURNAL

AMBIENT LIGHT VIDEO DISPLAY Proposed Classification
Robert W. Gundlach U.S. Cl. 315/Il

Int. Cl. HOlj 31/48

The ambient light video display 10 comprises a video tube
with a multi~layered Lace plate in place of the conven~
tional phosphor coated glass.

The face plate comprises a thin conducting layer 1, a
white low conductivity charge capture layer 2, an electri~
cal fie1d~-sensitive layer 3, and a transparent electrode
4 such as NESA glass or other suitable transparent conduc~
tive layer on a transparent substrate, ~Then a beam of
sufficiently energetic electrons strikes the thin conducting
layer 1, most of the electrons will penetrate a considerable
distance into the low conductivity layer 2, This produces
an electrical field across the electrical field-~sensitive
layer 3 which is proportional to the charge density and its
relative distance from thin conducting layer 1.

Optical density of field~sensitive layer 3 is reduced in
proportion to the field and therefore the electron will
produce a brightening in the areas of charge penetration.

The electrical field~sensitive layer 3 can comprise needle~
shaped herapathite crystals in suspension, liquid crystalline
compositions, photochromics or other suitable field~sensitive
materials. With thin layer suspensions of herapathite

Volume 1 Number 7 July 1976 41

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AMBIENT LIGHT VIDEO DISPLAY (Contd)

crystals, electric fields as low as 15 to 20 volts pe...