Display Device Touch and Fingerprint Sensor Moisture Measurement
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Solution Overview
Problem
Existing display devices face challenges in accurately measuring skin moisture levels due to limited range of capacitance change and environmental factors affecting touch sensors, leading to poor measurement accuracy.
Innovation Solution
A display device with integrated touch and fingerprint sensors that calculates skin moisture levels using touch sensing signals and corrects them based on high-quality skin characteristic data from fingerprint sensors, improving accuracy by applying a weight to the moisture level calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch sensor is used to measure skin moisture level, then measurement range is expanded, but measurement precision deteriorates due to limited capacitance change range and environmental factors
Solution Approach 1:
The patent combines touch sensor and fingerprint sensor into an integrated sensing system. The touch sensor provides broad measurement coverage while the fingerprint sensor delivers high-precision skin characteristic data. By merging the capabilities of both sensors and processing their data together, the system achieves both wide adaptability and high measurement precision that neither sensor could achieve alone.
2Measurement precision
If fingerprint sensor is used alone for skin measurement, then measurement precision is improved, but device complexity increases due to separate sensor configuration
Solution Approach 1:
The patent makes the fingerprint sensor multi-functional by enabling it to serve both fingerprint authentication and skin moisture measurement purposes. The same fingerprint sensor hardware is used for both functions, eliminating the need for a separate dedicated skin measurement sensor. This universal approach reduces device complexity while maintaining high measurement precision through the sensor's inherent high-resolution capabilities.
3Ease of operation
If touch sensor readings are used directly for moisture level, then ease of operation is maintained, but reliability deteriorates due to environmental factor interference
Solution Approach 1:
The patent implements a feedback mechanism where the fingerprint sensor continuously provides high-precision skin characteristic data that serves as reference information. This feedback is used to correct and compensate for environmental factor interference in the touch sensor readings. The system automatically adjusts measurements based on the reliable fingerprint sensor data, maintaining both ease of operation and high reliability without requiring manual calibration or intervention.
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
Enhances the accuracy and precision of skin moisture measurement by utilizing fingerprint sensor data to refine touch sensor readings, providing more accurate numerical values of skin moisture levels.
Implementation Method 1
a touch sensor on a surface of the display panel and configured to generate a touch sensing signal in response to touch of an object
Implementation Method 2
a fingerprint sensor spaced apart from the touch sensor and configured to detect the object in a first mode to generate a first sensing signal and to detect the object in a second mode to generate a second sensing signal
Data Source
AI summary
A display device includes a touch sensor, a fingerprint sensor, and a sensor driver. The touch sensor generates a touch sensing signal in response to touch of an object on a display panel. The fingerprint sensor detects the object in a first mode to generate a first sensing signal and detects the object in a second mode to generate a second sensing signal. The sensor driver calculates a touch position and a moisture level of the object based on the touch sensing signal, generates fingerprint information based on the first sensing signal, and corrects the moisture level based on the second sensing signal.