Constant brightness control for electroluminescent lamp

Details Constant brightness control for electroluminescent lamp Constant brightness control for electroluminescent lamp

2011-08-02

2011-08-02

Vo, Tuyet Thi (Department: 2821)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S211000, C345S212000, C345S214000, C345S204000

Reexamination Certificate

active

07990362

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.

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