Fingerprint Detection Chip Excitation Voltage Adjustment
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Solution Overview
Problem
Fingerprint detection chips with non-uniform package thickness lead to varying capacitance values across detection units, resulting in poor imaging contrast and efficiency, as thinner packages produce higher capacitance and thicker packages produce lower capacitance, causing all detection units not to operate in a desired state.
Innovation Solution
A method and apparatus for adjusting the excitation voltage of a fingerprint detection chip by detecting the capacitance value between detection units and a metal ring, allowing for the adjustment of the excitation voltage to ensure all units operate optimally, even with non-uniform package thickness, through a signal transmitting unit and control module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the package thickness is reduced to improve imaging contrast, then the contrast increases, but the capacitance becomes too large causing detection units to operate out of desired state
Solution Approach 1:
The patent divides the detection chip into multiple detection units with different excitation voltage settings corresponding to different package thickness regions. Each detection unit is configured with optimized parameters suitable for its local package thickness characteristics, allowing thin-package units to maintain desired operation state while preserving high imaging contrast capability.
Solution Approach 2:
The patent adjusts the excitation voltage parameter of detection units based on package thickness. By changing the excitation voltage to match the capacitance characteristics of different package thicknesses, the system maintains optimal detection performance across varying package specifications without sacrificing imaging contrast.
2Area of stationary object
If the package thickness is increased to improve detection coverage, then the detection area expands, but the imaging contrast becomes too low resulting in poor imaging effect
Solution Approach 1:
The patent implements different excitation voltage settings for detection units located in different package thickness zones. Detection units in thick-package regions use higher excitation voltages to compensate for reduced capacitance and maintain imaging contrast, while enabling broader detection coverage through the extended package structure.
Solution Approach 2:
The system dynamically adjusts excitation voltage parameters based on the package thickness characteristics of each detection unit. This parameter adaptation allows thick-package detection units to maintain sufficient imaging contrast while utilizing the expanded detection area provided by the increased package thickness.
3Ease of manufacture
If non-uniform package thickness is present, then manufacturing flexibility increases, but different capacitance values across detection units cause inconsistent operation states
Solution Approach 1:
The patent configures each detection unit with excitation voltage settings tailored to its local package thickness. This localized optimization allows the system to accommodate non-uniform package thickness variations from manufacturing while ensuring each detection unit operates in its desired state, maintaining overall system reliability despite manufacturing flexibility.
Solution Approach 2:
The system adjusts excitation voltage parameters for each detection unit based on measured or predetermined package thickness characteristics. This parameter customization compensates for capacitance variations caused by non-uniform package thickness, ensuring consistent operation states across all detection units regardless of manufacturing variations.
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
This approach ensures all detection units of the fingerprint detection chip operate in a desired state, improving detection efficiency and user experience by maintaining consistent electric quantities across units.
Implementation Method 1
detect a capacitance value of a coupling capacitance formed between the plurality of detection units in the second detection area and the metal ring
Data Source
AI summary
The present disclosure provides a method and an apparatus for adjusting an excitation voltage of a fingerprint detection chip and a fingerprint detection chip. The method for adjusting an excitation voltage of a fingerprint detection chip includes: S1, transmitting an excitation signal to the metal ring by the signal transmitting unit, so as to detect a capacitance value of a coupling capacitance formed between the plurality of detection units in the second detection area and the metal ring; or enabling the metal ring grounded, and applying an excitation signal to the plurality of detection units in the second detection area by the signal transmitting unit, so as to detect a capacitance value of a coupling capacitance formed between the plurality of detection units in the second detection area and the metal ring; and S2, adjusting an excitation voltage of the first detection area according to the capacitance value of the coupling capacitance formed between the plurality of detection units in the second detection area and the metal ring.