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Display device

  • US 5,297,247 A
  • Filed: 08/30/1993
  • Issued: 03/22/1994
  • Est. Priority Date: 07/07/1987
  • Status: Expired due to Term
First Claim
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1. In a system for transmitting messages from a common source to a plurality of movable destinations by radio transmission, a device at at least one of the destinations, comprising:

  • (a) receiver means for receiving a radio message from the common source, said message comprising a sequence of coded signals;

    (b) fixed memory means for storing fixed graphical images, which include character font images, at addressable locations;

    (c) read-write memory means for storing graphical images that can be changed, which include character font images, at addressable locations;

    (d) processor means, coupled to said receiver means, for processing the coded signals received from said receiver means, said processor means including;

    (1) means for converting each coded signal into an address code having N bits of 2N possible address codes;

    (2) first means for addressing said fixed memory means with a first set of the 2N possible address codes to retrieve fixed graphical images therefrom;

    (3) second means for addressing said read-write memory means with a second set of the 2N possible address codes to retrieve the graphical images therefrom;

    (4) means responsive to a command signal from the common source for altering the graphical images stored in said read-write memory means, whereby the total number of graphical images retrievable from said fixed memory means and said read-write memory means by the 2N possible address codes exceeds 2N ; and

    (e) display means coupled to said processing means for displaying the graphical images retrieved from said fixed memory means and said read-write memory means by said first and second addressing means.

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