A laser color display device utilizing digital deflectors and dispersion correction

Claim 2

A device as claimed in claim 2, wherein said polarizer employed for the control of the brightness of each said beam is constituted by a Kerr-cell.

Claim 3

A device as claimed in claim 2 wherein a phosphorus screen is placed in said second focal plane.

Claim 4

A device as claimed in claim 2 wherein a multimchrome and multifrequency laser light source is used, a first set of dichroic mirrors being arranged between said light source and the polarizers of the three devices, and a second set of dichoric mirrors between the deflection arrangement and the first lens.

Claim 5

An optical device comprising three laser imaging systems each having digitally controlled light deflectors and polarizers for producing superimposed images, each of said laser imaging systems comprising a laser light source producing a multiple frequency beam of light, a digital voltage controllable deflection device positioned in said beam and dividing said beam into a plurality of individual horizontally and vertically deflectable image points, a voltage controllable polarization device positioned in said beam between said deflection device and said laser light source for controlling the brightness of the image points, a first lens arranged in the beam at the emergence of the light from said digital deflection device for focusing said beam into a first focal point plane, and a second lens for focusing the beam emerging from said first focal plane and into a second focal plane, said digital deflection device including means compensating dispersion phenomena produced by said first and second lens over the range of laser light frequencies, said second focal plane common to all three systems.

Claim 6

A device as claimed in claim 6, for producing colored images, the light rays deflected by the three devices having different wavelengths ( lambda 1, lambda 2, lambda 3), the light rays emerging from the three devices being superimposed by arranging a set of dichroic mirrors between the deflection arrangements of the three devices and the first lens.

Claim 7

A device as claimed in claim 6, further comprising an auxiliary device for storing an intermediate image of the incoming signal, means for scanning the stored intermediate image, said scanning means providing a compensating flicker frequency signal which is supplied to both the intensity modulator as well as the digital deflection device, whereby the image imposed on the screen is at a frame frequency such that flicker is not observed by the human eye.

Claim 8

A device as claimed in claim 6 wherein a further polarizing switch is arranged between the digital light deflector and the first lens, said polarizing switch being operated alternately, thereby providing images polarized linearly and images polarized relatively perpendicularly, sad images providing a three-dimensional display.