Low intensity displays compatible with night vision imaging systems
First Claim
1. A Liquid Crystal Display for use with low light imaging systems, the liquid crystal display comprising:
- an LCD panel comprising at least one LCD cell;
a backlight positioned relative to the LCD panel so as to provide backlight illumination for the LCD panel;
a backlight current controller that provides a tube current, the tube current being limited to a peak current, the peak current being adjustable by an external current control input; and
a backlight controller configured to provide illumination control for the backlight, the backlight controller providing the tube current to the backlight, and the backlight controller setting a voltage provided to the backlight according to an external voltage control input.
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Accused Products
Abstract
An controllable intensity LCD display that provides normal or extremely low visible light and infrared intensity levels so as to be usable with military night vision gear (NVG) or Night Vision Imaging Systems (NVIS). The LCD display includes wide dynamic range backlight inverter power supply to extend the range of backlight dimming available with conventional cold cathode florescent (CCF) lights. An optional bridged power inverter provides yet further useable intensity reduction. Video controller RAMDAC palette programming further provides illumination attenuation using the LCD elements themselves. A ‘Hot Mirror’, i.e., infrared reflecting dielectric coatings, on various surfaces of the display'"'"'s light path is used to further reduce infrared emissions.
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Citations
13 Claims
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1. A Liquid Crystal Display for use with low light imaging systems, the liquid crystal display comprising:
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an LCD panel comprising at least one LCD cell;
a backlight positioned relative to the LCD panel so as to provide backlight illumination for the LCD panel;
a backlight current controller that provides a tube current, the tube current being limited to a peak current, the peak current being adjustable by an external current control input; and
a backlight controller configured to provide illumination control for the backlight, the backlight controller providing the tube current to the backlight, and the backlight controller setting a voltage provided to the backlight according to an external voltage control input. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for controlling a Liquid Crystal Display for use with low light imaging systems, the method comprising:
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an LCD panel comprising at least one LCD cell;
positioning a backlight relative to a LCD panel so as to provide backlight illumination for the LCD panel;
providing a tube current, the tube current being limited to a peak current, the peak current being adjustable by an external current control input; and
provide illumination control for the backlight through a controller providing the tube current to the backlight, the providing illumination control comprising setting a voltage provided to the backlight according to an external voltage control input.
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Specification