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Telephone set line status display

  • US 4,653,094 A
  • Filed: 03/19/1985
  • Issued: 03/24/1987
  • Est. Priority Date: 03/19/1985
  • Status: Expired due to Fees
First Claim
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1. In a telephone set, display apparatus for displaying the use status of a telephone line, comprising:

  • a liquid crystal display (LCD) means associated with the line, said LCD means including a display area which displays a uniform light color when the LCD means is off, said LCD means including a transparent panel aligned with said display area on to which a dark color first indicia has been placed, such first indicia being clearly visible when the LCD means is off, and said LCD means displaying a second light color indicia on said display area when on, said second indicia including a dark background for said second indicia which extends into a region which is in alignment with the first indicia, so that when the LCD means is on, the second indicia is visible and the first indicia cannot be seen because it appears to be a part of the dark background of the second indicia; and

    control means connecting the LCD means to a low current source within the telephone line so that the LCD means is powered by such current source, said control means being responsive to a condition of the telephone line, so that in response to first condition of the telepone line, the LCD means is on and the second indicia is displayed, and in response to a second condition of the telephone line the LCD means is off and the first indicia is displayed.

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