Backlighting device with a transparent sheet having straight ridges
US5735590A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1995 |
| Grant date | Apr 7, 1998 |
| Priority date | — |
| Expiry date | Mar 1, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0071
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A linear light source is disposed adjacent to the side face of a transparent light conducting plate. The thickness of the light conducting plate decreases as the position goes away from the light source. Light diffusing elements are formed on the major surface of the light conducting plate opposite to its light exit surface. At least one transparent sheet has, on the same surface thereof, a number of prisms having straight ridges that are arranged substantially parallel with each other at small intervals. The transparent sheet is disposed on the side of the light exit surface of the light conducting plate so that extensions of the straight ridges intersect the light source substantially perpendicularly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.