Prismatic member with coarsened portions or triangular prismatic and semi-circular prismatic members arranged on a flat light emitting surface
US5600455A · kind A · utility
116Cited by
7References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1994 |
| Grant date | Feb 4, 1997 |
| Priority date | — |
| Expiry date | Aug 31, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0068
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A transparent member having a multiplicity of prism-like convex portions which are aligned in parallel to each other and formed on at least one of surfaces of the member; the member is used to be disposed between a light emitting surface side of a surface light source device and a liquid crystal display device; and by using the member, it is possible to illuminate the liquid crystal display device in a bright and uniform manner and to prevent that any stripe pattern is appeared.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.