Fingerprint Identification Circuit Power Optimization
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Solution Overview
Problem
Fingerprint identification processes in terminals often mistakenly initiate power-consuming operations when non-fingerprint skin is detected, leading to unnecessary power waste.
Innovation Solution
A method and apparatus that detect contact with a fingerprint identification area, acquire characteristic information, and determine if it includes a fingerprint, initiating identification only when a fingerprint is confirmed, and maintaining a sleep state when no fingerprint is detected, using a fingerprint identification integrated circuit to acquire section images and contour information for accurate determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal performs fingerprint identification process whenever contact is detected on the fingerprint identification area, then the fingerprint identification function is activated, but power is wasted when non-fingerprint skin is detected
Solution Approach 1:
The patent applies preliminary action by performing preliminary detection of contact characteristics (contour shape, section image features) before initiating the full fingerprint identification process. The fingerprint identification module detects whether the contact object has a fingerprint-like contour or characteristic points before activating the complete identification function, thus avoiding unnecessary power consumption while maintaining identification accuracy
Solution Approach 2:
The patent implements partial action by executing only a portion of the fingerprint identification process initially - specifically, detecting contact characteristics and determining whether the contact area contains fingerprint patterns. The full identification process is activated only when preliminary detection confirms the presence of fingerprint characteristics, reducing energy waste from complete identification processes on non-fingerprint contacts
2Ease of operation
If the terminal activates fingerprint identification function on any contact, then no contact is ignored, but unnecessary operations are performed on non-fingerprint contacts
Solution Approach 1:
The system performs preliminary detection of contact characteristics including contour shape analysis and characteristic point extraction before initiating full fingerprint identification. This preliminary action ensures that only contacts with fingerprint-like features trigger the complete identification process, improving effective identification rate while maintaining responsive operation for valid fingerprints
3Measurement precision
If the terminal performs complete fingerprint identification process, then accurate identification is achieved, but power consumption increases
Solution Approach 1:
The patent segments the fingerprint identification process into distinct stages: preliminary detection stage (contour shape analysis, characteristic point extraction) and full identification stage (complete fingerprint matching). By dividing the process, the system performs only necessary operations based on preliminary findings, reducing overall power consumption while preserving identification accuracy when needed
Solution Approach 2:
The system performs partial fingerprint identification by executing only the preliminary detection and characteristic analysis portions of the full identification process when contact characteristics indicate non-fingerprint objects. The complete identification process is activated only when preliminary detection confirms fingerprint presence, optimizing the balance between accuracy and energy usage
Data Source
AI summary
The disclosure relates to a method, apparatus and computer-readable medium for fingerprint identification. The method includes detecting a contact of an object with a fingerprint identification area of a terminal, wherein the contact of the object covers a contact area on the fingerprint identification area; acquiring characteristic information of the contact area; determining whether the contact area includes a fingerprint based on the characteristic information; performing fingerprint identification when it is determined that the contact area includes the fingerprint; and maintaining a sleep state when it is determined that the contact area does not include the fingerprint.