Very low duty cycle pulse width modulator

Details Very low duty cycle pulse width modulator Very low duty cycle pulse width modulator

1996-12-15

1998-11-17

Chow, Dennis-Doon

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345148, 345211, G09G 336

Patent

active

058382941

ABSTRACT:
An apparatus which outputs very low duty cycle pulses of a consistent width. It is common to use a pulse width modulator as part of a liquid crystal display dimming system to vary the brightness. In the typical pulse width modulating scheme for lamp dimming, certain noise irregularities may appear at the beginning of a ramping voltage. These irregularities result in pulse widths which vary greatly. In the present invention, the slope of the ramping voltage is greatly increased at the beginning of the period, thus making the comparison between the reference voltage and the ramping voltage more accurate.

REFERENCES:
patent: 3440566 (1969-04-01), Swanson
patent: 3604995 (1971-09-01), Als et al.
patent: 4482844 (1984-11-01), Schweer et al.
patent: 4614415 (1986-09-01), Hyatt
patent: 4998045 (1991-03-01), Ruby
patent: 5027034 (1991-06-01), Ruby et al.
patent: 5105127 (1992-04-01), Lavand et al.
patent: 5184117 (1993-02-01), Gauthier
patent: 5225742 (1993-07-01), Beasley
patent: 5420481 (1995-05-01), McCanney
patent: 5428265 (1995-06-01), Booth, Jr. et al.
patent: 5606296 (1997-02-01), Seong

Affiliated with

Also associated with

Rating

Very low duty cycle pulse width modulator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Very low duty cycle pulse width modulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Very low duty cycle pulse width modulator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-888663