Browse Prior Art Database

Matrix Addressable Laser Display

IP.com Disclosure Number: IPCOM000083311D
Original Publication Date: 1975-Apr-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Grischkowsky, D: AUTHOR [+2]

Abstract

A laser display is proposed which can address a 10O X 100 matrix of resolvable spots.

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Matrix Addressable Laser Display

A laser display is proposed which can address a 10O X 100 matrix of resolvable spots.

A schematic representation of the laser display is shown in Fig. 1 and comprises a laser beam 2, an amplitude modulator 4 and an addresser 6 for selecting a spot on screen 8 on which the laser beam will dwell. The addresser, which is the heart of the display system, is shown in Fig. 2.

The amplitude modulated laser beam, emanating from the modulator 4, passes through a negative lens 10. A pair of Fabry-Perot interferometers 12 and 14, respectively, act as spatial filters that only pass light of a given wavelength in angular cones. Such cones of light are transmitted as ring patterns, displaced from each other. The displacement of the ring patterns is achieved by tilting the Fabry-Perot interferometers 12, 14 with respect to each other.

As seen in Fig. 3, a light spot 16 is transmitted by the addresser only at the intersection of two different ring patterns 18 and 20, respectively. The positive lens 22 focuses the transmitted beam onto viewing screen 8.

Scanning of the amplitude modulated laser beam is obtained by sweeping ring patterns through the beam. Each Fabry-Perot interferometer 12, 14 includes an optical cavity bounded by mirrors; a change in the optical lengths by 1/2 wavelength of the separation between each pair of mirrors of each Fabry-Perot interferometer will completely sweep the laser beam. Such change in optical lengths can be achi...