US 6,578,985 B1 · Back light assembly for use with back-to-back flat-panel displays

Abstract

The present invention features a system for uniformly distributing luminance and a high degree of collimation from a back light module for flat-panel, liquid crystal displays (LCDs) simultaneously. A constant and uniform luminance output of the back light module in two directions is obtained through appropriate selection of lamps, geometry and optical components. An appropriate balance of lamps, lamp spacing, diffusers and light collimating optics are chosen to produce a high brightness back light module with very high intensity output over two very large surfaces. Variations in intensity over the illuminated area are minimized using light recycling in conjunction with the reflective diffusers and collimating optics. Precision collimators eliminate light beyond a defined angle, as required in tiled or monolithic flat-panel LCDs with predetermined display specifications.

Claims28

Dependent claims

A high-output back light module for use with two back-to-back flat-panel displays, comprising:

a) a housing having an open front and an open back and defining a lamp cavity, said lamp cavity having substantially solid, optically-reflective side walls;
b) an array of lamps disposed within said lamp cavity;
and
c) lamp control means operatively connected to at least one lamp of said array of lamps to provide power thereto and to optimize light output therefrom;
wherein said housing, said lamp cavity and said lamp array are disposed intermediate two back-to-back flat-panel displays at a predetermined distance from each of said two back-to-back flat-panel displays.

2 more elements

Dependencies are inferred from the claim text.

Back light assembly for use with back-to-back flat-panel displays

Life of this patent

Back light assembly for use with back-to-back flat-panel displays

Life of this patent

Abstract

Claims28