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Method of and apparatus for controlling a display

  • US 4,794,388 A
  • Filed: 02/12/1982
  • Issued: 12/27/1988
  • Est. Priority Date: 02/20/1980
  • Status: Expired due to Fees
First Claim
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1. A display function control signal generator comprising:

  • handle means comprising a shaft which is movable generally radially with respect to its axis;

    means responsive to the application of a force to said handle means in a first direction for generating first command signals;

    means responsive to the application of a force to said handle means in a second direction opposite to said first direction for generating second command signals;

    means responsive to the application of a force to said handle means in a third direction for generating third command signals;

    means responsive to the application of a force to said handle means in a fourth direction opposite to said third direction for generating fourth command signals;

    means responsive to said first and second command signals for storing a first value corresponding to the quantity of the information to be presented on a display and generating a first control signal corresponding to said first value for varying the quantity of the information to be presented on a display; and

    means responsive to said third and fourth command signals for storing a second value corresponding to the scale of the information to be presented on a display and generating a second control signal corresponding to said second value for varying the scale of the information to be presented on the display, wherein the format of the information to be presented on the display changes in response to the generation of said command signals.

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