Title:
【発明の名称】非常に低いデューティ・サイクルのパルス幅変調器
Document Type and Number:
Japanese Patent JP2001507884
Kind Code:
A
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.
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Inventors:
Pricewater, Michael Earl
Application Number:
JP52767498A
Publication Date:
June 12, 2001
Filing Date:
October 09, 1997
Export Citation:
Assignee:
Honeywell Incorporated
International Classes:
G09G3/34; H03K7/08; G09G3/20; (IPC1-7): H03K7/08
Attorney, Agent or Firm:
Masaki Yamakawa (5 outside)