Display brightness control method and apparatus for conserving battery power

  • US 6,731,274 B2
  • Filed: 05/15/2003
  • Issued: 05/04/2004
  • Est. Priority Date: 10/28/1999
  • Status: Expired due to Term
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First Claim
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1. A method for conserving battery power in a portable computer, said computer being of the type operable on power supplied by a battery power source and an external power source, comprising the steps of:

  • detecting a change from the external power source to the battery power source;

    reducing display brightness gradually from a user selected brightness level to a target brightness level if the target brightness level is less than the user selected brightness level; and

    leaving the display brightness level unchanged if the target brightness level is not less than the user selected display brightness level, wherein the step of reducing the display brightness gradually occurs through use of a rate limiting function so as to be substantially undetectable to a user when battery operation is detected.

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