Liquid crystal display and reflective diffuser therefor including a reflection cavity section and an illumination cavity section
US5166815A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 28, 1991 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | Feb 28, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0046
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A diffuser for backlighting a display panel consists of a shell having a flat surface for positioning against the backside of the panel. The shell has a cavity with two sections. A reflection cavity section extending into the shell from the flat surface has highly reflective walls one of which opposite the mouth of the cavity defines a ramp. An illumination cavity section extending into the shell intercepts the reflection cavity section at a boundary near the foot of the ramp. When light propagates from the illumination cavity section into the reflection cavity section, the walls of the latter cavity section distribute that light by reflection and the ramp redirects that light to the mouth of the reflection cavity section from which the light propagates to the display panel as a uniform diffuse emanation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.