Arrangement for automatically controlling brightness of cockpit displays
First Claim
Patent Images
1. An automatic brightness control comprising:
- ambient light sensor means located on a display for monitoring ambient light;
user selected brightness settings for controlling raster brightness and overall brightness of the display;
harmonization gain potentiometer means for calibrating cathode voltage of said display;
microprocessor means interfacing with said ambient light sensor means, said user selected brightness settings and said harmonization gain potentiometer means for implementing a control algorithm and for providing a raster gain signal;
selectable auto mode/manual mode switch means interfacing to said microprocessor means; and
video signal means that is multiplied with said raster gain signal for producing cathode voltage that provides automatic compensation for effects of said ambient light.
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Abstract
An automatic brightness control provides automatic compensation for the effects of ambient light on a display. A microprocessor interfaced to ambient light sensors, pilot selected brightness controls and a harmonization gain potentiometer, implements a control program and outputs a raster gain signal. A video signal is multiplied with the raster gain signal therefore producing a cathode voltage that provides the automatic compensation.
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Citations
11 Claims
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1. An automatic brightness control comprising:
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ambient light sensor means located on a display for monitoring ambient light; user selected brightness settings for controlling raster brightness and overall brightness of the display; harmonization gain potentiometer means for calibrating cathode voltage of said display; microprocessor means interfacing with said ambient light sensor means, said user selected brightness settings and said harmonization gain potentiometer means for implementing a control algorithm and for providing a raster gain signal; selectable auto mode/manual mode switch means interfacing to said microprocessor means; and video signal means that is multiplied with said raster gain signal for producing cathode voltage that provides automatic compensation for effects of said ambient light. - View Dependent Claims (2, 3)
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4. An automatic brightness control comprising:
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a display; ambient light sensor means located on said display for monitoring ambient light; user selected brightness settings for controlling rater brightness and overall brightness of the display; microprocessor means interfacing with said ambient light sensor means and said display for implementing a control algorithm and for providing a raster gain signal; selectable auto mode/manual mode switch means interfacing to said microprocessor means; and video signal means that is multiplied with said raster gain signal for producing cathode voltage that provides automatic compensation for effects of said ambient light. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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Specification