Touch Control Device Fingerprint Detection Power Optimization
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Solution Overview
Problem
Integrated touch devices with fingerprint modules suffer from high power consumption and low recognition accuracy due to the need for continuous scanning of the entire touch screen or pad, leading to inefficient fingerprint unlocking processes and increased user experience issues.
Innovation Solution
A touch device with a pressure detection unit that enables the fingerprint collection function only when a user's touch exceeds a preset threshold, using capacitive, self-capacitive, or resistive pressure detection methods to determine the pressure and area of the touch, thereby reducing unnecessary power consumption and improving recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fingerprint module continuously scans the entire touch screen or pad area, then the finger touch detection function is provided, but the power consumption becomes high
Solution Approach 1:
The patent segments the touch screen into multiple regions and divides the fingerprint detection function across these regions. Instead of continuously scanning the entire screen, the system activates only specific pixel groups in specific regions when needed, reducing overall power consumption while maintaining detection capability.
Solution Approach 2:
The patent implements periodic scanning of pixel groups rather than continuous scanning. The fingerprint module activates pixel groups at specific time intervals and locations, allowing the system to enter low-power states between scanning events while still providing reliable touch detection when triggered.
2Measurement precision
If the fingerprint module scans with high resolution (greater than 300DPI), then the measurement precision is improved, but the power consumption becomes relatively high
Solution Approach 1:
The patent applies local quality by activating pixel groups with specific detection characteristics only in regions where fingerprint detection is actually needed. Different regions of the touch screen have different detection requirements, and the system adjusts pixel group activation accordingly, maintaining high resolution where necessary while reducing power consumption in other areas.
Solution Approach 2:
The patent uses partial action by activating only a subset of pixels (pixel groups) rather than the entire screen at full resolution continuously. The system activates just enough pixels to detect fingerprint touches when needed, using high-resolution scanning selectively rather than continuously, thus balancing measurement precision with power consumption.
3Reliability
If the integrated apparatus uses capacitance sensing on the entire touch screen area, then the finger touch detection function is provided, but the recognition degree is low and accidental triggering occurs easily
Solution Approach 1:
The patent segments the touch screen into multiple pixel groups with different detection characteristics. By dividing the screen into regions with specific pixel group configurations, the system can differentiate between intentional finger presses and accidental touches more effectively, improving recognition accuracy while maintaining detection coverage.
Solution Approach 2:
The patent changes detection parameters by using pixel groups with different activation thresholds and detection characteristics in different regions. This allows the system to adjust sensitivity locally, reducing false positives from accidental touches while maintaining high recognition for intentional fingerprint presses.
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
Enables rapid fingerprint sensing with low power consumption and enhanced user experience by activating the fingerprint module only when a valid touch is detected, reducing accidental triggers and maintaining a high recognition level.
Implementation Method 1
The fingerprint module scans a few pixels in fixed positions with intervals and detects the capacitance variance to achieve the finger touch detection function
Implementation Method 2
using capacitive, self-capacitive, or resistive pressure detection methods to determine the pressure and area of the touch
Implementation Method 3
using capacitive, self-capacitive, or resistive pressure detection methods to determine the pressure and area of the touch
Data Source
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AI summary
The present disclosure discloses a touch device and a method for performing fingerprint detection on the touch device, wherein the touch device includes: a touch plane configured to recive a user's touch; a detection unit fixed to the touch plane and configured to detect the user's touch; a fingerprint module fixed to the touch plane and configured to collect the user fingerprint; a control block, wherein the control block configured to enable the fingerprint module to collect the fingerprint of the user touched on the touch plane when the detection unit that the touch plane is touched by the user. According to the present invention, the fingerprint collection function of the fingerprint module is enabled after detecting by the detection unit that the user touch the touch plane, so as to collect the fingerprint that the user touched on the touch plane. Moreover, the user only needs to perform the touch operation once in the overall process, and the fingerprint module is enabled only when the fingerprint of the user touches the touch plane, so that a problem of the relatively high power consumption for maintaining operation states of the fingerprint module for a very long time is solved.