Back light illuminator for liquid crystal display apparatus
US5986727A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1997 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | Apr 3, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133615
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A back light illuminator for liquid crystal display apparatus comprises a fluorescent lamp, a light guide member, and a reflection plate enclosing the fluorescent lamp and an incident portion of the light guide member so as to reflect light rays toward the incident portion of the light guide member. The reflection plate has at least a curved portion having a parabolic cross-section or a elliptical cross-section so as not to reflect the light rays in a direction to the fluorescent lamp. Thus, absorption of reflected light by the fluorophor of the fluorescent lamp is minimized, and the luminance of the back light illuminator is increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.