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Method of controlling display brightness of portable information device, and portable information device

  • US 6,967,647 B2
  • Filed: 01/02/2003
  • Issued: 11/22/2005
  • Est. Priority Date: 01/02/2003
  • Status: Active Grant
First Claim
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1. An apparatus for controlling brightness of a display unit of a portable information device, the portable information device having a battery for supplying power to at least the display unit, the apparatus comprising:

  • a battery voltage detecting unit that detects a voltage of the battery;

    a control unit that controls the brightness of the display unit based on the voltage detected by the battery voltage detecting unit; and

    an estimating unit that estimates a voltage drop in the voltage detected by the battery voltage detecting unit in response to an electrical connection of a device to the portable information device,wherein the control unit controls the brightness of the display unit based on the voltage drop estimated by the estimating unit,the apparatus further comprising a memory that stores a first table of voltages of devices and name of the devices that are electrically connectable to the portable information device in a correlation form,wherein the estimating unit estimates the voltage drop based on the first table.

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