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Terminal device, accounting system and data processing method

  • US 6,515,716 B1
  • Filed: 05/15/2000
  • Issued: 02/04/2003
  • Est. Priority Date: 05/17/1999
  • Status: Expired due to Fees
First Claim
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1. An image display device, comprising:

  • a cathode-ray tube for receiving a video signal;

    first and second sync signal sensors for sensing whether horizontal and vertical sync signals relative to the video signal are present;

    a main power source for feeding power to circuits for driving said cathode ray tube;

    a heater power source for feeding power to a heater of said cathode-ray tube;

    first and second sync signal sensor power sources for feeding power to said first and second sync signal sensors respectively; and

    a power source unit for feeding power to said main power source, to said heater power source device, and to said first and second sync signal sensors according to power supplied from a mains AC power source device, wherein when said first sync signal sensor fails to sense both the horizontal and vertical sync signals, said main power source device, said heater power source device, and said first sync signal sensor power source device are turned off to save power and when said second sync signal sensor senses at least one of the horizontal and vertical sync signals, said first sync signal sensor power source device that was turned off is turned on.

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