Fluroescent lamps at full front surface luminance for backlighti

Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation

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Details

315309, 315291, 315224, G05F 100

Patent

active

061571431

ABSTRACT:
A back-light assembly for a liquid crystal display (LCD) includes an LCD display screen and at least one cold cathode fluorescent lamp positioned for illuminating a back-side of the display screen. A reflector positioned adjacent the lamp reflects light toward the display screen. A light diffuser is positioned between the lamp and the display screen; and a power controller regulates current supplied to the lamp from an external power source so as to establish a predetermined luminance level at the display screen. A light level sensor provides a signal representative of the luminance output of the lamp to the controller so as to regulate lamp current to maintain the predetermined luminance level.

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patent: 5907222 (1999-04-01), Lengyel et al.

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