# US 10,372,189 B2 · Power-saving method and device

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- Number: US 10,372,189 B2
- Document ID: US10372189B2
- Status: Granted
- Kind: B2
- Application number: 15/437,404
- Filed: 2017-02-20
- Published: 2018-06-07
- Granted: 2019-08-06
- Earliest claimed: 2016-12-01
- Assignees: Wistron Corporation
- Applicants: Wistron Corp.
- Inventors: Zong-Ying Shen
- Web page: https://patentgrep.com/patent/US10372189B2

## CPC

- G06F 1/3209: Monitoring remote activity, e.g. over telephone lines or network connections
- G06F 1/3215: Monitoring of peripheral devices
- G06F 1/3218: of display devices
- G06F 1/3231: Monitoring the presence, absence or movement of users
- G06F 1/3287: by switching off individual functional units in the computer system
- G06F 3/0325: {using a plurality of light emitters or reflectors or a plurality of detectors forming a reference frame from which to derive the orientation of the object, e.g. by triangulation or on the basis of reference deformation in the picked up image}
- G06F 3/0346: with detection of the device orientation or free movement in a three-dimensional [3D] space, e.g. 3D mice, 6-DOF [six degrees of freedom] pointers using gyroscopes, accelerometers or tilt-sensors
- H04N 5/63: Generation or supply of power specially adapted for television receivers
- H04N 5/58: in dependence upon ambient light
- Y02D 10/00: Energy efficient computing, e.g. low power processors, power management or thermal management
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A power-saving method is provided. The method is used in a device and includes: measuring, by a light sensor of the device, luminous intensity of ambient light and generating a measurement value of ambient light; determining whether the measurement value of ambient light is greater than a threshold; and controlling the device to switch between a quick-start mode and a standby mode based on a determination result indicating whether the measurement value of ambient light is greater than the threshold.

## Claims

### Claim 1

A power-saving method, used in a device, comprising:
measuring, by a light sensor of the device, luminous intensity of ambient light and generating a measurement value of ambient light;
determining whether the measurement value of ambient light is greater than a threshold;
when determining that the measurement value of ambient light is less than or equal to the threshold, controlling the device to operate in a standby mode; and
when determining that the measurement value of ambient light is greater than the threshold, performing the steps of:
detecting, by a motion sensor of the device, movement in a predefined area;
generating, by the motion sensor, a motion-detection signal when detecting the movement;
controlling the device to operate in a quick-start mode when receiving the motion-detection signal, wherein when the device operates in the quick-start mode and keeps receiving the motion-detection signal, performing the steps of:
starting a timer;
switching the device from the quick-start mode to the standby mode when the timer has expired and the device is not turned on; and
determining, after the device has switched to the standby mode, whether the device receives the motion detection signal, and switching the device back to the quick-start mode when it is determined that the motion detection signal is received; and
controlling the device to operate in the standby mode when not receiving the motion-detection signal.

### Claim 2 (depends on 1)

The power-saving method as claimed in claim 1, wherein when the device operates in the quick-start mode, the method further comprises:
switching the device from the quick-start mode to the standby mode when the measurement value of ambient light is less than or equal to the threshold.

### Claim 3

A power-saving device, comprising:
a light sensor, measuring luminous intensity of ambient light and generating a measurement value of ambient light;
a motion sensor, generating a motion-detection signal when detecting movement in a predefined area;
a control circuit, comprising a processor and a memory, wherein the control circuit is coupled to the light sensor and the motion sensor;
wherein the processor is configured to execute a program code stored in the memory to:
receive the measurement value of ambient light;
determine whether the measurement value of ambient light is greater than a threshold;
when it is determined that the measurement value of ambient light is less than or equal to the threshold, control the device to operate in a standby mode; and
when it is determined that the measurement value of ambient light is greater than the threshold:
detect, by a motion sensor of the device, movement in a predefined area;
generate, by the motion sensor, a motion-detection signal when the movement is detected;
control the device to operate in a quick-start mode when the motion-detection signal is received, wherein when the device operates in the quick-start mode and keeps receiving the motion-detection signal the processor:
starts a timer;
switches the device from the quick-start mode to the standby mode when the timer has expired and the device is not turned on; and
determines, after the device has switched to the standby mode, whether the device receives the motion detection signal, and switches the device back to the quick-start mode when it is determined that the motion detection signal is received; and
control the device to operate in the standby mode when the motion detection signal is not received.

### Claim 4 (depends on 3)

The power-saving device as claimed in claim 3, wherein when the device operates in the quick-start mode, the processor is further configured to execute the program code to:
switch the device from the quick-start mode to the standby mode when the measurement value of ambient light is less than or equal to the threshold.