Light emission control device, backlight device, liquid...

Details Light emission control device, backlight device, liquid... Light emission control device, backlight device, liquid...

2006-03-14

2006-03-14

Lefkowitz, Sumati (Department: 2675)

Computer graphics processing and selective visual display system

Plural physical display element control system

Segmented display elements

C323S361000

Reexamination Certificate

active

07012578

ABSTRACT:
The present invention provides a light emission control device that can drive a plurality of cold cathode fluorescent tubes independently only by connecting a plurality of piezoelectric transformers to only one piezoelectric inverter circuit. A first phase control portion that outputs a signal for changing a phase of the third and the fourth driving control signals with respect to a phase of the first and the second driving control signals to the second driving portion, and a second phase control portion that outputs a signal for changing a phase of the fifth and the sixth driving control signals with respect to a phase of the first and the second driving control signals to the third driving portion are provided in the piezoelectric inverter circuit. Thus, the phase difference of the driving control signals is controlled, so that the output powers to the plurality of cold cathode fluorescent tubes are controlled.

REFERENCES:
patent: 5866969 (1999-02-01), Shimada et al.
patent: 6075325 (2000-06-01), Kouno et al.
patent: 5-251784 (1993-09-01), None
patent: 8-45679 (1996-02-01), None
patent: 2000-69759 (2000-03-01), None
patent: 3052938 (2000-04-01), None

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