The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 22, 2008
Filed:
Feb. 14, 2006
Neil Gibson, Freising, DE;
Juergen Neuhaeusler, Bad Aibling, DE;
Neil Gibson, Freising, DE;
Juergen Neuhaeusler, Bad Aibling, DE;
Texas Instruments Deutschland GmbH, Dallas, TX (US);
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.