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Reducing power consumption in monitor by switching off heater power in power-off mode

  • US 5,944,830 A
  • Filed: 03/10/1997
  • Issued: 08/31/1999
  • Est. Priority Date: 03/08/1996
  • Status: Expired due to Term
First Claim
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1. An apparatus for controlling the power management of a display monitor, said apparatus comprising:

  • a power supply unit for converting an AC input voltage to a DC output voltage;

    a voltage regulator for producing a constant output voltage supplied to the monitor;

    a transformer for producing necessary operating voltages for each part of the monitor, in which the output voltage of the voltage regulator being supplied to a primary of the transformer;

    a feedback circuit for detecting current variation at the output of the transformer and for supplying the detected variation value to the voltage regulator;

    a switching circuit provided in a heater power supply line between one output of the transformer and a heater of a color display tube of the monitor for switching off the heater power supply line when the monitor enters a power-off mode;

    a microcomputer operated in response to a video signal received at a video input port of the monitor to produce a power control signal and a corresponding control mode indicating signal;

    a signal input port connected to a video output of a computer; and

    a signal amplifier for amplifying and processing a video input signal supplied to a signal input of the color display tube.

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