Low intensity displays compatible with night vision imaging systems

摘要

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.