Capacitance and Thermal Sensor Overlap for Input Detection
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Solution Overview
Problem
Existing operating body detection devices face challenges in achieving reliable input detection with capacitance-type sensors, particularly in distinguishing between objects and ensuring non-interference with image visibility on screens.
Innovation Solution
The integration of a capacitance-type sensor with a heat source sensing sensor and a pressure sensor, utilizing a piezoelectric membrane with high light transmittance, allows for overlapping detection surfaces to enhance reliability and accuracy while maintaining transparency for image visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitance-type sensor is used to detect operating body position, then the visibility of the displayed image is maintained, but the reliability of input detection is insufficient
Solution Approach 1:
The patent combines a capacitance-type sensor with a heat source sensing sensor in a single detection device. The capacitance sensor detects the position of the operating body while the heat source sensor detects the temperature distribution, and both detection results are integrated to improve input detection reliability. This merging of multiple sensing functions into one device resolves the contradiction by achieving higher reliability without proportionally increasing device complexity.
Solution Approach 2:
The detection device is designed to perform multiple functions: it can detect operating body position through capacitance sensing, detect heat sources through thermal sensing, and distinguish between different types of objects (e.g., human body vs. other objects) by combining both detection modalities. This multi-functionality approach allows the device to improve reliability across various detection scenarios while maintaining a unified sensor structure.
2Measurement precision
If a transparent electrode member is used in the capacitance sensor, then image visibility is maintained, but detection accuracy is reduced
Solution Approach 1:
The patent introduces a heat source sensing sensor as an intermediary detection mechanism. While the transparent electrode member in the capacitance sensor maintains image visibility, the heat source sensor provides complementary detection capability by sensing temperature distribution. This intermediary sensing approach compensates for the reduced detection accuracy caused by the transparent electrode, achieving both good visibility and acceptable detection performance.
Solution Approach 2:
The patent changes the detection parameter from purely electrical (capacitance) to include thermal parameters. By detecting temperature distribution in addition to capacitance changes, the system compensates for the signal weakening caused by transparent electrodes. This parameter change allows the system to maintain both image visibility and detection accuracy through multi-parameter sensing.
3Measurement precision
If multiple sensors are integrated to improve detection reliability, then object identification accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges the capacitance-type sensor and heat source sensing sensor into a single integrated detection device with a unified structure. Both sensors share common components such as the substrate and electrode arrangements, reducing the overall complexity that would result from completely separate sensor systems. This merging approach achieves improved object identification accuracy while controlling device complexity through shared architecture.
Solution Approach 2:
The integrated detection device is designed as a universal platform that performs multiple detection functions (capacitance sensing, thermal sensing, and object classification) within a single device structure. This multi-functional design avoids the complexity of multiple separate specialized devices, achieving high object identification accuracy through integrated multi-mode sensing rather than through complex assembly of separate components.
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 configuration improves the reliability of input detection by combining capacitance, pressure, and heat source sensing, reducing misidentification of objects and maintaining image clarity, thus enhancing the overall performance of the operating body detection device.
Implementation Method 1
a pressure sensor comprising a pressure sensing film that has a piezoelectric membrane having a pressure-sensitive surface
Implementation Method 2
a heat source sensing sensor comprising a heat source sensing film having a heat source sensing membrane with a heat source sensing surface
Implementation Method 3
a capacitance-type sensor having a capacitance sensing surface on which a plurality of sensing electrodes is arranged
Data Source
AI summary
An object is to provide an operating body detection device having improved reliability of a capacitance-type sensor in input detection. An operating body detection device comprising: a capacitance-type sensor having a capacitance sensing surface on which a plurality of sensing electrodes is arranged; and a heat source sensing sensor comprising a heat source sensing film having a heat source sensing membrane with a heat source sensing surface. The detection surface that detects an operating body may have a region in which the capacitance sensing surface and the heat source sensing surface overlap when viewed from a normal direction of the detection surface. Preferably, the control unit that controls the capacitance-type sensor and the heat source sensing sensor starts heat source measurement with the heat source sensing sensor on condition that an object is detected with the capacitance-type sensor.