Ultrasonic Sensor Reference Value Calculation for Display Panels
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Solution Overview
Problem
Ultrasonic sensors in display devices face variability in material, laminate structure, and layout, affecting their performance, necessitating a method to ensure accuracy and sensitivity before reaching end users.
Innovation Solution
A method and system for calculating a reference value of an ultrasonic sensor by transmitting ultrasonic signals, generating images, selecting parameters based on similarity to a reference image, and calculating a reference value using these parameters to assess and optimize sensor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ultrasonic sensor is used in display devices with varying material, laminate structure, and layout, then the sensor can be applied to different device configurations, but the sensing performance and accuracy vary across different positions and devices
Solution Approach 1:
The patent applies parameter changes by systematically varying ultrasonic signal parameters (frequency, amplitude, pulse width) and measuring the resulting sensing values at different positions. This allows identification of optimal parameter combinations that maximize the reference value and minimize deviation, thereby improving measurement precision while maintaining adaptability across different display panel configurations
Solution Approach 2:
The patent implements preliminary action by pre-calculating the reference value through comprehensive measurements at multiple positions before actual use. The measured data is stored and used to establish reference thresholds, enabling the sensor to compensate for positional variations and maintain consistent accuracy without requiring real-time recalibration
2Measurement precision
If multiple ultrasonic images are generated and parameters are selected based on similarity to reference image, then the accuracy of reference value calculation is improved, but the measurement time and processing complexity increase
Solution Approach 1:
The patent applies partial action by generating multiple ultrasonic images with different parameters but selecting only the most relevant ones based on similarity to a reference image. This approach achieves sufficient measurement precision without the need to process all possible parameter combinations, thereby reducing time loss while maintaining accuracy
Solution Approach 2:
The patent uses parameter changes by varying the selection criteria (similarity threshold) and the number of parameters evaluated. This allows optimization of the balance between measurement precision and processing time by adjusting how strictly multiple images are evaluated and compared against the reference
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 a larger reference value, resulting in smaller deviations in sensing values, indicating improved uniformity and effectiveness of the ultrasonic sensor performance across different display panel configurations.
Implementation Method 1
transmitting a first ultrasonic signal from the ultrasonic sensor toward the first surface; generating a plurality of ultrasonic images based on a first ultrasonic echo signal
Implementation Method 2
transmitting a first ultrasonic signal from the ultrasonic sensor toward the first surface
Data Source
AI summary
A method for calculating a reference value of an ultrasonic sensor includes: transmitting a first ultrasonic signal from the ultrasonic sensor toward a first surface of a contact device while an object is positioned on the first surface; generating a plurality of ultrasonic images based on a first ultrasonic echo signal; selecting an ultrasonic image having a highest similarity to a reference image from among the ultrasonic images; storing a first parameter and a second parameter corresponding to a selected ultrasonic image; while the object is not positioned on the first surface, transmitting a second ultrasonic signal based on the first parameter from the ultrasonic sensor toward the first surface; and calculating the reference value of the ultrasonic sensor using the second parameter and a second ultrasonic echo signal.