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Method for automatically adjusting the background brightness of cellular phone display

  • US 20030022699A1
  • Filed: 07/26/2001
  • Published: 01/30/2003
  • Est. Priority Date: 07/26/2001
  • Status: Active Grant
First Claim
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1. In a cellular phone having a display, a central processing unit (CPU), a photosensitive element on a surface, and a control circuit coupled to said photosensitive element, a method comprising the steps of:

  • (a) switching said cellular phone to an automatic background brightness control mode;

    (b) measuring a voltage between two terminals of said photosensitive element by said CPU; and

    (c) adjusting a background brightness of said display with respect to said measured voltage.

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