Liquid crystal displays utilizing polymer dispersed liquid crystal devices for enhanced performance and reduced power
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United States of America Patent
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Nov 7, 2000
Grant Date -
N/A
app pub date -
Mar 30, 1998
filing date -
Mar 30, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
Disclosed is an avionics display device for use in the cockpit of an aircraft. The display device includes a liquid crystal display adapted for using a source of light to display information to a viewer and a backlight adapted to controllably provide a portion of the source of light for use by the liquid crystal display in displaying the information. A polymer dispersed liquid crystal (PDLC) device is positioned between the liquid crystal display and the backlight. An ambient light sensor adapted to sense a level of ambient light in the cockpit of the aircraft provides a sensor output indicative of the sensed ambient light level. Luminance control circuitry coupled to the ambient light sensor, to the backlight and to the PDLC device, receives the sensor output and generates as a function of the sensed ambient light level control signals for controlling the intensity of the light provided by the backlight and the transmissivity of the PDLC device.
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