Light Sensor Fingerprint Triggering via Signal Intensity
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Solution Overview
Problem
Conventional electronic devices with optical fingerprint sensing functions often experience unnecessary power consumption and accidental triggering due to accidental touches, as they lack effective mechanisms to differentiate between intentional and accidental user interactions.
Innovation Solution
An image sensing device and fingerprint sensing method that utilize a light sensor and controller to operate in a light sensing mode during sleep mode, determining signal intensity changes to switch to fingerprint sensing mode only when intentional user interaction is detected, thereby preventing accidental waking and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a light sensor is used as a triggering element for fingerprint sensing, then the device can detect user interaction, but the device may be frequently accidentally triggered leading to unnecessary power consumption
Solution Approach 1:
The patent applies dynamics by making the light sensor's operation mode changeable between sleep mode and fingerprint sensing mode based on detected signal patterns. The controller dynamically adjusts the sensor's functionality - operating in low-power sleep mode during normal conditions and switching to active fingerprint sensing mode only when intentional user interaction is detected through specific signal intensity change patterns
Solution Approach 2:
The patent changes the operational parameters of the light sensor by adjusting its sensitivity and activation thresholds. By monitoring signal intensity changes and comparing them against predetermined thresholds, the system distinguishes between accidental touches (small intensity changes) and intentional fingerprint placement (larger intensity changes), thereby controlling when the sensor activates full fingerprint sensing functionality
2Reliability
If the light sensor operates continuously in fingerprint sensing mode, then accurate fingerprint detection is achieved, but power consumption increases significantly
Solution Approach 1:
The patent implements periodic action by having the light sensor operate in alternating cycles between sleep mode and active sensing mode. Instead of continuous operation, the sensor periodically checks for user interaction by monitoring signal intensity changes, and only activates full fingerprint sensing when triggered by patterns indicating intentional use, thereby reducing overall power consumption while maintaining detection capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively reduces power consumption by preventing the electronic device from waking up for fingerprint sensing due to accidental touches, ensuring efficient and controlled power usage.
Implementation Method 1
a light sensor and a controller. The controller is coupled to the light sensor. When the electronic device is operated in a sleep mode, the controller operates the light sensor in a light sensing mode, and the controller determines whether a number of signal intensity changes of a photosensitive signal output by the light sensor
Data Source
AI summary
An image sensing device and a fingerprint sensing method are provided. The image sensing device is suitable for being installed in an electronic device. The image sensing device includes a light sensor and a controller. The controller is coupled to the light sensor. When the electronic device is operated in a sleep mode, the controller operates the light sensor in a light sensing mode. The controller determines whether a number of signal intensity changes of a photosensitive signal output by the light sensor exceeds a predetermined number of intensity changes within a predetermined length of time, so as to switch the operation of the light sensor in a fingerprint sensing mode.