Liquid crystal back light illuminating device and liquid crystal

Details Liquid crystal back light illuminating device and liquid crystal Liquid crystal back light illuminating device and liquid crystal

1998-04-14

1999-08-17

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315224, 315DIG5, 315276, G05F 100

Patent

active

059398400

ABSTRACT:
A liquid crystal back light illuminating device includes a driving circuit which receives a first value voltage at light-on starting. The device drives a voltage stepping up circuit and lights on a cold cathode tube with a stepped-up high voltage. Thereafter, it receives a second value voltage, drives the voltage stepping up circuit and continues the lighting-on of the cold cathode tube with a lower stepped-up voltage than the former stepped-up high voltage. A slowly varying voltage which is obtained by charging a capacitor with a small current is applied to the driving circuit via an amplifier and a switch circuit. When the varying output voltage comes close to the second value voltage beyond a predetermined value, the switch circuit switches to the second value voltage. Thereby, flickering of the cold cathode tube at the time of switching the light-on condition is prevented.

REFERENCES:
patent: 4585974 (1986-04-01), Stupp et al.
patent: 5404082 (1995-04-01), Hernandez et al.
patent: 5485061 (1996-01-01), Ukita et al.
patent: 5621281 (1997-04-01), Kawabata et al.
patent: 5629588 (1997-05-01), Oda et al.
patent: 5726536 (1998-03-01), Hagiwara

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