| http://www.w3.org/ns/prov#value | - It also relates to such a system.BACKGROUND OF THE INVENTIONIn the projection (or display) of images, especially of television type, it is known practice to use a liquid-crystal optical valve, the transparency of each image-forming element of which is controlled as a function of the luminance of eachpoint of the image to be formed.The luminous energy for the projection is delivered by an illuminat
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