Apparatus for displaying images wtih reduced coarseness
US4587553A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 10, 1983 |
| Grant date | May 6, 1986 |
| Priority date | — |
| Expiry date | Nov 10, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/8907
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.