Browse Prior Art Database

Flat Panel Backlight Relecting Device

IP.com Disclosure Number: IPCOM000057823D
Original Publication Date: 1988-Jul-01
Included in the Prior Art Database: 2005-Feb-15

Publishing Venue

IBM

Related People

Authors:
Garwin, RL Hodgson, RT [+details]

Abstract

A technique is described whereby a flat panel backlight reflecting device provides for efficient fluorescent or incandescent light to be spread uniformly over the surface, but directed toward the eyes of the user. Liquid crystal display (LCD) devices are typically difficult to read in normal office environments and almost impossible to read in low light levels. The device is particularly designed to enhance the readability of flat panel LCDs and similar devices. The flat panel backlight, as shown in Fig. 1, enables light from aperture fluorescent tube 10, or an incandescent source, to be focused into tapered flat plate 11. If the plate were not tapered, most of the light would be internally reflected at the interface between the more dense transparent material of the plate and the less dense air.