Night vision compatible display backlight
First Claim
Patent Images
1. A night vision imaging system (NVIS) compatible display comprising:
- an array of light-emitting diodes (LEDs) of different colors configured to backlight the display;
including an orange LED, a green LED, and a blue LED;
the array including a means for blending the light from the different colors of LED so as to provide the perception of a single color output from the array;
a controller configured to operate in a first operational mode to jointly illuminate multiple colors of LEDs including the orange LED at a first illumination intensity, the green LED at a second illumination intensity, and the blue LED at a third illumination intensity so as to provide light output from the array having a color perceived substantially as a continuous white spectrum;
a liquid crystal display (LCD) providing a color display when illuminated by white light, the LCD positioned in front of the array to receive the light in there from; and
wherein the first, second and third illumination intensities of the array when operated by the controller in the first operational mode do not exceed a maximum level designated for a NVIS standard compliant system and provide for a substantially white spectrum permitting the LCD to produce the color display.
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Abstract
A system and method of backlighting a display using LEDs is night vision viewing compatible and requires no filters. The backlight includes an array of LEDs and a controller configured to selectively illuminate the LEDs in the array. The array of LEDs includes orange LEDs that are illuminated during a night vision viewing mode and may include red LEDs that are illuminated in a non-night vision viewing mode.
101 Citations
17 Claims
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1. A night vision imaging system (NVIS) compatible display comprising:
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an array of light-emitting diodes (LEDs) of different colors configured to backlight the display;
including an orange LED, a green LED, and a blue LED;
the array including a means for blending the light from the different colors of LED so as to provide the perception of a single color output from the array;a controller configured to operate in a first operational mode to jointly illuminate multiple colors of LEDs including the orange LED at a first illumination intensity, the green LED at a second illumination intensity, and the blue LED at a third illumination intensity so as to provide light output from the array having a color perceived substantially as a continuous white spectrum; a liquid crystal display (LCD) providing a color display when illuminated by white light, the LCD positioned in front of the array to receive the light in there from; and wherein the first, second and third illumination intensities of the array when operated by the controller in the first operational mode do not exceed a maximum level designated for a NVIS standard compliant system and provide for a substantially white spectrum permitting the LCD to produce the color display. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of backlighting a liquid crystal display (LCD) for use with NVIS systems comprising:
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activating a plurality of LEDs of different colors including red LEDs, green LEDs, and blue LEDs during a first operating condition that is not compatible with NVIS to provide light perceived as a continuous white spectrum to backlight the LCD providing a color display when illuminated by white light; activating a plurality of LEDs of different colors including orange LEDs, green LEDs, and blue LEDs during a second operating condition while deactivating the red LEDs to provide light perceived as a continuous white spectrum to backlight the LCD and viewing the LCD with night vision equipment; and wherein an intensity of light emitted during the second operating condition complies with a night vision standard for viewing the LCD with a night vision imaging system (NVIS) while providing for a substantially white spectrum permitting the LCD to provide a color display. - View Dependent Claims (15, 16, 17)
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Specification