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Microcomputer controlled display backlight

  • US 4,868,563 A
  • Filed: 09/25/1987
  • Issued: 09/19/1989
  • Est. Priority Date: 09/25/1987
  • Status: Expired due to Term
First Claim
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1. A method for illuminating a message presented on an LCD display of a selective call receiver, the selective call receiver further having a controller means and a read switch operably coupled to the controller means for effecting the presentation of the message on the display, and a light switch coupled to the controller means and to an illumination means for effecting the illumination of the display, said method comprising the steps of:

  • manually actuating the light switch and generating independently of said controller means a first electrical signal for the duration of the manual activation of the light switch;

    illuminating the display with the illumination means by the first electrical signal independent of said controller means;

    sensing the generation of the first electrical signal by the controller means during presentation of the message and, and in response thereto, generating a second electrical signal separate from said first electrical signal, solely during the presentation of the message; and

    maintaining the display illumination with the illumination means by the second electrical signal independent of the generation of said first electrical signal.

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