Wide range dual-backlight display

A backlight display system having a display screen 112 illuminated directly by high intensity daylight lamps 110 and illuminated indirectly by lower intensity nightlight lamps 114a, 114b positioned to reflect their light off the daylight lamps 110 and onto the display screen 112. The backlight displ...

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Bibliographic Details
Main Authors KEVEN L WALSH, ROBERT J VITELLO, KEVIN CHARLES KELLEHER, ROBERT M MERRIFIELD
Format Patent
LanguageEnglish
Published 17.12.1997
Edition6
Subjects
ADVERTISING
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION
CRYPTOGRAPHY
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING
DISPLAY
DISPLAYING
EDUCATION
FREQUENCY-CHANGING
LABELS OR NAME-PLATES
NON-LINEAR OPTICS
OPTICAL ANALOGUE/DIGITAL CONVERTERS
OPTICAL LOGIC ELEMENTS
OPTICS
PHYSICS
SEALS
SIGNS
TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Summary:A backlight display system having a display screen 112 illuminated directly by high intensity daylight lamps 110 and illuminated indirectly by lower intensity nightlight lamps 114a, 114b positioned to reflect their light off the daylight lamps 110 and onto the display screen 112. The backlight display system includes intensity gradient filters 116 and/or distribution lenses 117 to enhance the uniformity of reflected nightlight, a brightness enhancement filter/diffuser 162 disposed before the display screen 112, and optical filtering positioned between the illumination sources and the display screen. Photosensor 123a,b,c controlled intensity feedback is used to provide smooth continuous dimming transition from a wide range of maximum to minimum intensity. The system also provides a third monochromatic nightlight lamp array 134a,b for "class A" Night Vision Imaging System (NVIS) compatibility and an override switch to assure that lighting restrictions needed for night-vision are maintained. The system thus provides illumination of the display screen for operating during daytime conditions, nighttime conditions, nighttime conditions of Class A NVIS device use, and nighttime conditions of Class B NVIS device use.
Bibliography:Application Number: GB19970011442