High output flat-panel display back light module
US6341879B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1999 |
| Grant date | Jan 29, 2002 |
| Priority date | — |
| Expiry date | Sep 28, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/36
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention features a system for uniformly distributing luminance and a high degree of collimation from a back light module for a flat-panel, liquid crystal display (LCD). A constant and uniform luminance output of the back light module is obtained through appropriate selection of lamps, geometry and optical components. An appropriate balance of lamps, lamp spacing, reflective light back plane, and diffuser and collimating optics are chosen to produce a high brightness back light module with very high intensity output over very large surfaces. Variations in intensity over the illuminated area are minimized using light recycling in conjunction with the collimating optics. Optimum geometries are determined for the purpose of maximizing light output at high efficiencies, while minimizing luminance gradients across the display. Finally, a precise collimator eliminates light beyond a defined angle, as required in a tiled, flat-panel LCD.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.