Constant brightness control for electro-luminescent lamp

Details Constant brightness control for electro-luminescent lamp Constant brightness control for electro-luminescent lamp

2008-05-13

2008-05-13

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S247000, C315S246000, C315S224000

Reexamination Certificate

active

07372216

ABSTRACT:
A ballast (11) includes a variable output DC converter source (12) and an inverter circuit (14) arranged to provide AC output voltage to an electro-luminescent (EL) lamp (16). A Q factor of EL lamp can characterize the age of the EL lamp. A series resonance-parallel loaded circuit and two voltage detector (18, 20) are constructed to measure the Q factor. A processor (17) controls the output of DC voltage source in accordance with a look-up table containing constant brightness algorithm based on the derived voltage and Q relationship.

REFERENCES:
patent: 6177768 (2001-01-01), Kamata et al.
patent: 2004/0113567 (2004-06-01), Yamauchi et al.
patent: 2006/0006818 (2006-01-01), Fishbein et al.
patent: 2006/0055346 (2006-03-01), Ohta et al.
patent: 2006/0261748 (2006-11-01), Nukisato et al.

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