Optical display screen utilizing light-absorbing fibers

Abstract

An optical display screen reduces image diffusion and extraneous images by the selective absorption of light rays oblique to the line of sight of an operator. Light-absorbing fibers such as black glass are embedded in the screen, parallel with the line of sight, and extending either completely through the screen, or through a thinner layer laminated to the screen. A conventional light emitting layer, such as a phosphor layer is provided. Oblique components of the phosphor emission are absorbed by the fibers. Sufficiently oblique external rays are also so absorbed, and prevented from creating extraneous images. The line of sight components of the phosphor emission are passed through the screen undiminished. Methods of forming the screen include the steps of forming a bundle of unclad clear fibers, including a small percentage of light-absorbing fibers, and fusing the bundle into a block containing parallel light-absorbing fibers.

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