Patent ID: 6473141
Filing Date: 2002-10-29
Classification: G02B,G02F,G03H,H04N

Abstract:
A method of making a mask for a display comprising a display arrangement for producing a plurality of viewing zones, each of which has a non-uniform first angular intensity profile with a first angularly varying component, the display further comprising a compensator for superimposing in the viewing zones a second angular intensity profile having a second angularly varying component which is substantially the inverse of the first angularly varying component, the display arrangement comprising a spatial light modulator having a plurality of picture elements and an array of discrete light sources, wherein the picture elements are arranged as columns and the light sources comprise parallel evenly spaced line sources, the light sources comprise a diffuse backlight and a parallax barrier, the parallax barrier comprises a plurality of slits, each of which cooperates with a respective group of the picture element columns to form the viewing zones of a zeroth order lobe, the compensator comprises a mask disposed between the parallax barrier and the backlight, and the mask comprises a plurality of strips of varying light transmissivity which cooperate with the slits of the parallax barrier to form the second angularly varying intensity profilethe method comprising the steps of: disposing a photosensitive material in a plane substantially parallel to the spatial light modulator and intersected by the viewing zones; operating the display with the picture elements being transmissive so as to expose the photosensitive material; and reducing and repeating an image recorded by the photosensitive material.