Electric lamp and discharge devices: systems – Pulsating or a.c. supply
Reexamination Certificate
2008-04-22
2008-04-22
Tran, Thuy V. (Department: 2821)
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
C315S291000, C315S307000
Reexamination Certificate
active
11353888
ABSTRACT:
For controlling the light intensity in a multi-lamp illumination device an automatic sequencing of the PWM dimming distributes the burst dimming pulses during the display's frame period. Specifically, the method includes the steps of generating a plurality of synchronized pulse-width modulated lamp activation signals of equal duty-cycles; individually controlling the phase of each lamp activation signal within the frame periods; and separately supplying each lamp of the illumination device with one of the lamp activation signals. The lamp activation signals are preferably all derived from a common pulse-width modulated intensity control signal. By evenly distributing the lamp activation signals, or pulses, within the display's frame period, the EMI emission is minimized, the refresh rate is artificially enhanced, and the peak to average current is reduced.
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Gibson Neil
Neuhaeusler Juergen
Brady III Wade J.
Le Tung X
Telecky , Jr. Frederick J.
Texas Instruments Deutschland GmbH
Tran Thuy V.
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