Method and apparatus for controlling sleep mode using a low power processor in portable terminal

  • US 9,851,779 B2
  • Filed: 07/02/2013
  • Issued: 12/26/2017
  • Est. Priority Date: 07/03/2012
  • Status: Active Grant
First Claim
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1. A method of controlling a sleep mode in a portable terminal, the method comprising:

  • detecting, by a sub-controller, a first sensor signal generated by a first sensor when a main controller is in the sleep mode, the first sensor comprising a camera and the first sensor signal comprising a visual signal;

    extracting a sensed pattern from the detected first sensor signal;

    determining whether the extracted sensed pattern is substantially identical with a preset wake-up pattern; and

    cancelling the sleep mode by waking-up the main controller based on the extracted sensed pattern detected by the camera being substantially identical with the wake-up pattern, when the portable terminal is not moving,wherein the sub-controller is further configured to determine whether the portable terminal is moving when detecting the visual signal,wherein the sub-controller is further configured to extract the visual pattern from the detected visual signal when the portable terminal is not moving,wherein the sensed pattern comprises a visual pattern and the wake-up pattern comprises a visual wake-up pattern,wherein some pixels included in the camera are configured to be activated in the sleep mode and the camera is connected to the sub-controller through a low speed interface,wherein the sub-controller, connected to the first sensor employing a first resolution, extracts the sensed pattern, and wakes up the main controller if the extracted sensed pattern is identical with the preset wake-up pattern,wherein the main controller turns on a display and employs a second resolution of the first sensor, if the extracted sensed pattern is identical with the preset wake-up pattern,wherein the first resolution is lower than the second resolution, andwherein in response to the sleep mode changing to the wake-up due to the detection of a predetermined situation of the portable terminal, the main controller limits some functions of the portable terminal or turns off power of the portable terminal.

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