Method of driving a cold cathode tube using a ceramic transforme

Details Method of driving a cold cathode tube using a ceramic transforme Method of driving a cold cathode tube using a ceramic transforme

1995-12-21

1998-03-10

Pascal, Robert

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Transformer in the supply circuit

331116R, 345102, 315 55, 315307, 310311, 310314, 310318, H01L 4108

Patent

active

057265364

ABSTRACT:
A cold cathode tube is used for a back light illuminating a liquid crystal with a light from the back. A ceramic transformer is used instead of a conventional wound transformer for a power source to light this cold cathode tube to eliminate various problems caused by transformers. The output voltage and current of this ceramic transformer are coordinated with the cold cathode tube by utilizing the frequency characteristic of the boosting ratio of the ceramic transformer to light the cold cathode tube and adjust the light. The output from an oscillator is amplified and is applied to a ceramic transformer. The output frequency from the oscillator is swept from the higher side to the lower side. When the output frequency decreases from fa.fwdarw.fb, the output voltage of the ceramic transformer in the case that the load resistance indicated by the solid line is large will be Vb and the cold cathode tube will be lighted. When lighted, the impedance of the cold cathode tube will quickly decrease and the voltage will shift to the output voltage Vc of the ceramic transformer in the case that the load resistance indicated by the broken line is small. The frequency is further decreased to fd to apply a proper voltage Vd to the cold cathode tube and adjust the luminance.

REFERENCES:
patent: 4054806 (1977-10-01), Moriki et al.

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