Patent · US Expired

Projection tube having an insulating layer of magnesium oxide and a high transmission metal grating

US4838651A · kind A · utility

3Cited by

6References

5Claims

0Family size

Assignee

Nokia Graetz · DE

Inventors

Jurgen Pottharst · Stuttgart, DE
Kurt M. Tischer · Wissen, DE

Key dates

Filing date	Dec 1, 1987
Grant date	Jun 13, 1989
Priority date	—
Expiry date	Dec 1, 2007

Classification

Technology area (CPC G)Physics
CPC primaryG02F1/133348
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A projection tube includes a liquid crystal cell having liquid crystal material sandwiched between two plates. The cell is addressable by an electron beam and serves as a light valve for plane-parallel light with which the projection tube is illuminated from behind. On the side facing the liquid crystal material, the plate on which the electron beam writes has dot coatings of indium-tin oxide to achieve a high resolution and a sharp definition of the image to be displayed on a screen. The side of the plate on which the electron beam writes has an insulating layer of magnesium oxide.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.