Hughes Aircraft Company

Other

Mary A Lemoine

Kenneth R Hesse

Esther Sluzky

A far-red emitting phosphor for cathode ray tubes used in liquid crystal light valves comprises Y.sub.3-y Gd.sub.y Al.sub.5-x Ga.sub.x -O.sub.12 :A, where x ranges from 0 to 5, y ranges from 0 to 3, and A is selected from the group consisting of chromium, iron, vanadium, neodymium, dysprostum, cobalt, nickel, titanium or combination thereof.

Far-red emitting phosphor for cathode ray tubes

A far-red emitting phosphor for cathode ray tubes used in liquid crystal light valves comprises Y.sub.3-y Gd.sub.y Al.sub.5-x Ga.sub.x O.sub.12 :A, where x ranges from 0 to 5, y ranges from 0 to 3, and A is selected from the group consisting of chromium, iron, vanadium, neodymium, dysprosium, cobalt, nickel, titanium or combination thereof.

Liquid crystal light value in combination with cathode ray tube

A far-red emitting phosphor for cathode ray tubes used in liquid crystal light valves comprises lithium aluminum (or gallium) oxide, activated with iron or chromium. Increasing the activator concentration from 0.005 mole (commercially available) to about 0.015 to 0.05 mole increases the phosphor efficiency by about 50% and reduces the decay time from 30 msec (for the commerically available material) to 19 msec. Reducing the particle size to an average of 4 .mu.m or less provides the requisite high resolution for the CRT application.

Liquid-crystal light valve in combination with a cathode ray tube

A doubly activated yttriuim aluminum garnet (YAG) phosphor, activated with both europium and chromium, is provided. The concentration of Eu ranges from about 1 to 5 at %, while the concentration of Cr ranges from about 0.1 to 1 at %. The YAG:Eu,Cr phosphor has a line spectrum which more closely matches the spectral sensitivity of amorphous silicon liquid crystal light valves thereby, providing more efficient use of the available energy.

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Oceanside, CA, United States of America

Mary A Lemoine