Method and apparatus for using an array of grating light...

G - Physics – 02 – B

Patent

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G02B 26/08 (2006.01) G02B 5/18 (2006.01)

Patent

CA 2243347

A multicolor optical image-generating device comprised of an array of grating light valves (GLVs) organized to form light-modulating pixel units for spatially modulating incident rays of light. The pixel units are comprised of three subpixel components each including a plurality of elongated, equally spaced apart reflective grating elements arranged parallel to each other with their light-reflective surfaces also parallel to each other. Each subpixel component includes means for supporting the grating elements in relation to one another, and means for moving alternate elements relative to the other elements and between a first configuration wherein the component acts to reflect incident rays of light as a plane mirror, and a second configuration wherein the component diffracts the incident rays of light as they are reflected from the grating elements. The three subpixel components of each pixel unit are designed such that when red, green and blue light sources are trained on the array, colored light diffracted by particular subpixel components operating in the second configuration will be directed through a viewing aperture, and light simply reflected from particular subpixel components operating in the first configuration will not be directed through the viewing aperture.

L'invention porte sur un système optique de création d'images en couleurs consistant en un système de modulateurs de lumière à grille (GLV) organisé pour constituer des pixels modulant spatialement les rayons lumineux incidents. Chaque pixel se compose de trois sous-pixels comportant chacun plusieurs éléments de grille réflecteurs allongés, parallèles et régulièrement espacés, dont les surfaces réfléchissantes sont également parallèles. Chacun des sous-pixel comporte des moyens maintenant les éléments de grille dans leurs position respective et des moyens pour déplacer un élément sur deux par rapport à ses voisins entre une première configuration où les composants refléchissent les rayons incidents à la manière d'un miroir plan, et une deuxième configuration où les composants diffractent les rayons incidents réfléchis par les éléments de la grille. Les trois sous-pixels de chacun des pixels sont conçus pour que, lorsque les sources de rouge, de vert et de bleu sont dirigées sur la grille, la lumière colorée diffractée par les sous-pixels concernés, fonctionnant dans la deuxième configuration, soit dirigée vers un orifice de visualisation, et que la lumière simplement réfléchie par les sous-pixels concernés, fonctionnant dans la première configuration, ne le soit pas.

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