High contrast display device
US4692662A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jul 8, 1985 |
| Grant date | Sep 8, 1987 |
| Priority date | — |
| Expiry date | Jul 8, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J17/49
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Light-emitting cells of a display device are individually provided with inner walls at least partially covered by white reflectors consisting of glass material containing transparent particles having different refractive index by 5 to 80% by weight, so that extremely high luminous efficiency similar as that of optical integrating sphere can be realized. Also, openings for emitting colored light can be applied with color filters while the front surface other than those openings of the display device is covered with light-absorbing black material, so that the reflectance for incident ambient light can be extremely reduced. According to the multiplexed effect of the above structure, remarkably high display contrast can be readily realized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.