Sculptured transflector for dual mode active matrix liquid cryst

Details Sculptured transflector for dual mode active matrix liquid cryst Sculptured transflector for dual mode active matrix liquid cryst

1998-06-04

2000-03-21

O'Shea, Sandra

Illumination

Illuminated scale or dial

Internal light source

362 30, 362471, 362561, 362293, 362236, 362225, 362 33, G01D 1128

Patent

active

06039451&

ABSTRACT:
Disclosed are a backlight and avionics display using the same to provide light to a liquid crystal display (LCD) device. In the backlight, a day mode light source positioned on a first side of the LCD device and adapted to provide a first source of light for use by the LCD device during day mode operations. A night mode light source positioned on the first side of the LCD device is adapted to provide a second source of light for use by the LCD device during night mode operations. A sculptured transflector positioned between the day mode light source and the night mode light source has, at a first side adjacent the day mode light source, a transflective material and a plurality of arcuate or parabolic surfaces in order to maximize a percentage of light from the day mode light source which is reflected toward the LCD device.

REFERENCES:
patent: 4974122 (1990-11-01), Shaw
patent: 5143433 (1992-09-01), Farrell
patent: 5211463 (1993-05-01), Kalmanash
patent: 5420481 (1995-05-01), McCanney
patent: 5661578 (1997-08-01), Habing et al.
patent: 5886681 (1999-03-01), Walsh et al.
Duane A. Grave, Scot Olson and Philip Brown, Cockpit Displays II, Proceedings--SPIE--The International Society for Optical Engineering, Enhanced AMLCD and Backlight for Extended Luminance Range and Sunlight Readability, vol. 2462, Apr. 19-21, 1995.

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