Apparatus for displaying images wtih reduced coarseness
AssigneeSony Corporation
InventorsToshiro Watanabe, Akio Ohkoshi
Life of this patent
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Abstract
An image display apparatus includes an image display screen which is formed by a plurality of picture display elements arranged repeatedly with a predetermined pitch for displaying an image as a set of plural picture elements. In this case, one or more double refraction plates are disposed in front of the image display screen so that light rays from the picture display elements are double-refracted by each double refraction plate and that the density of the picture display elements is increased apparently. Thus, in a color cathode ray tube in which a phosphor face is formed by color phosphors arranged in a stripe pattern, it is possible to reduce the coarseness of the texture of the color phosphor stripe.
Claims5
An image display apparatus for displaying an image with reduced coarseness comprising:
- image display means having a plurality of vertically arranged, stripe-shaped picture display elements and having a black stripe disposed between adjacent picture display elements, all of which are arranged successively in repeating sets in a relative horizontal direction with said sets having a predetermined pitch for displaying an image as a pattern of picture elements formed by rays respectively emitted from said picture display elements;
- and
- double refraction plate means disposed in front of and on said image display means for dividing each said ray received from a respective picture display element of said image display means into an ordinary ray and an extraordinary ray, said double refraction plate means having a thickness for providing a displacement between each ordinary ray and a respective extraordinary ray such that each said ordinary ray and said respective extraordinary ray, when emitted from a front surface of said double refraction plate means, are displaced from one another in a horizontal direction relative to said vertically arranged picture display elements by a selected displacement less than the said predetermined pitch of said repeating sets of picture display elements.
Dependencies are inferred from the claim text.