Deeply filtered television image display
US4392077A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 14, 1979 |
| Grant date | Jul 5, 1983 |
| Priority date | — |
| Expiry date | Feb 14, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A low-cost, deeply filtered television imge display is depicted. A viewing screen includes a patterned layer of phosphor particles disposed contiguous to the inner surface of the display. The layer when excited emits light of a predetermined color. The display includes means for exciting selected areas of the layer to produce a luminescent informational image. The image is subject to loss of contrast caused by reflection of ambient light from the layer. The improvement comprises a shallow, random, clumped, discontinuous, open dispersion of contrast-enhancing particles of pigment having a body color corresponding generally to the predetermined color disposed directly on the viewing screen beneath the layer and not significantly admixed with the phosphor particles. The percentage of open area of the dispersion of pigment particles and the absorption characteristics thereof are such that the dispersion efficiently filters ambient light at its interface with the layer. This filtering is accomplished first by absorption of directly incident ambient light, and secondly by absorption of ambient light passing through the open dispersion and scattering back off the phosphor particles to the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.