VERY LOW DUTY CYCLE PULSE WIDTH MODULATOR

VERY LOW DUTY CYCLE PULSE WIDTH MODULATOR

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 a...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: PRAISWATER, MICHAEL, R
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
ADVERTISING
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION
BASIC ELECTRONIC CIRCUITRY
CRYPTOGRAPHY
DISPLAY
EDUCATION
ELECTRICITY
PHYSICS
PULSE TECHNIQUE
SEALS
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Beschreibung
Zusammenfassung: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.