Apertured fluorescent illumination device for backlighting an image plane
US5645337A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1995 |
| Grant date | Jul 8, 1997 |
| Priority date | — |
| Expiry date | Nov 13, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60K2360/336
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A backlighting unit for illuminating a planar display is provided, comprising an illumination source having a light emitting portion for emitting illumination toward the generally planar display, and a reflector for collecting the emitted illumination and reflecting the collected illumination toward the planar display, the reflector being positioned intermediate the illumination source and the display. The illumination source is a fluorescent lamp having an interior surface thereof substantially coated with a phosphor, and the light emitting portion is an aperture in the fluorescent lamp wherein no phosphor coating is present. The fluorescent lamp may be provided with a reflective wrap for increasing its illumination gain. A lens positioned between the reflector and the display receives the illumination reflected by the reflector and redirects the received illumination toward the display to provide even backlit illumination thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.