Patent · US Expired

Luminous display device

US3995940A · kind A · utility

13Cited by

3References

21Claims

0Family size

Assignee

COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES · FR

Inventors

Pierre Guyon · Meylan, FR
Robert Meyer · Meylan, FR

Key dates

Filing date	Mar 10, 1975
Grant date	Dec 7, 1976
Priority date	—
Expiry date	Mar 10, 1995

Classification

Technology area (CPC G)Physics
CPC primaryG02F1/21
WIPO fieldOptics
WIPO sectorInstruments

Abstract

The display device comprises a light source, a uniform layer C.sub.a of semi-reflecting material of small thickness and illuminated by the light source, a uniform layer C.sub.b of transparent material having a refractive index n and a thickness e deposited on the layer C.sub.a, the optical thickness of the layer C.sub.b being constant and equal to ne as measured at right angles to the surface, a reflecting layer C.sub.c deposited on at least part of the layer C.sub.b in order to form the patterns which are intended to be displayed.

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