Fingerprint Sensor Package Structure Touch Wake-Up
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fingerprint recognition systems in fingerprint locks face high standby power consumption and are prone to interference due to exposed metal rings, leading to low reliability and sensitivity issues.
Innovation Solution
A fingerprint sensor and recognition system with a first metal electrode integrated into the package structure, connected to a touch detection module, which feeds back a touch signal to enable power supply only when a finger is detected, reducing standby power consumption and enhancing anti-interference and ESD performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a metal ring is exposed for touch detection, then touch sensitivity is improved, but anti-interference ability and reliability deteriorate
Solution Approach 1:
The patent introduces a touch detection electrode as an intermediary element that is integrated into the package structure rather than using an exposed metal ring. This electrode serves as a mediator between the user's touch and the control module, enabling touch detection while being protected within the package structure, thus maintaining sensitivity while improving reliability and anti-interference capability.
2Reliability
If power supply is continuously provided to fingerprint sensor and algorithm chip, then recognition functionality is ensured, but standby power consumption increases
Solution Approach 1:
The patent implements periodic action by controlling the power supply to the fingerprint sensor and algorithm chip based on touch detection events. The control module receives touch signals from the touch detection electrode and only activates power supply when a touch is detected, otherwise the system remains in a low-power standby state. This periodic on-demand power supply ensures recognition functionality is available when needed while significantly reducing standby power consumption.
3Ease of operation
If metal ring is exposed for touch detection, then touch detection capability is improved, but ESD performance deteriorates
Solution Approach 1:
The touch detection electrode integrated into the package structure serves as a protected intermediary that detects touch without being directly exposed. This intermediary approach maintains touch detection capability while being shielded from direct ESD exposure, thus improving ESD performance compared to an exposed metal ring configuration.
Solution Approach 2:
The touch detection electrode is nested within the package structure, embedded in the substrate or package body. This nesting protects the electrode from external harmful factors like ESD while still allowing it to detect touch through the package structure, thereby maintaining ease of operation while improving protection against harmful factors.
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
The solution effectively reduces power consumption, improves reliability, and enhances anti-interference capabilities while maintaining flexibility in touch detection, making it suitable for fingerprint locks.
Implementation Method 1
a first metal electrode 12, connected with a touch detection module (61), where the touch detection module (61) is configured to receive a touch signal
Data Source
Figure 1A~1C
Figure 1D~3
Figure 4~5
AI summary
The present application provides a fingerprint sensor, a fingerprint recognition module and a fingerprint recognition system. The fingerprint sensor includes: a sensor die, configured to collect fingerprint information; a package structure, configured to package a structure sensor die, where the sensor die or the package structure includes a first metal electrode, which is connected with a touch detection module and is configured to feed back a touch signal to a control module connected with the touch detection module, so as to enable the control module to supply power to the fingerprint sensor according to the touch signal, and then enable the sensor die to collect fingerprint information. Under the premise of ensuring low standby power consumption of the fingerprint recognition system, the anti-interference ability and the ESD performance of the touch wake-up module are improved, and the flexibility of the touch wake-up scheme is improved as well, therefore it is easier to meet the requirements of the whole lock.