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Power management and device illumination mechanisms for a personal digital assistant

  • US 6,726,106 B1
  • Filed: 04/02/2002
  • Issued: 04/27/2004
  • Est. Priority Date: 04/02/2002
  • Status: Expired due to Term
First Claim
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1. A handheld device comprising:

  • a housing;

    a display mounted within the housing;

    a first light sensor mounted within the housing to detect light beams though the display;

    a plurality of keypads mounted on the housing; and

    an electro luminescent (EL) sheet, mounted within the housing below the display and the keypads, that provides lighting for the display and the keypads;

    wherein the handheld device goes into a sleep state whenever no light beams are detected at the first light sensor and the user is not operating the handheld device and the EL sheet is illuminated whenever no light beams are detected at the first light sensor and the user is operating the handheld device.

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