Touch Sensor Hard Coat Layer Light Transmittance
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Solution Overview
Problem
Conventional touch sensors with electrostatic position detection and pressure detection sensors suffer from reduced light transmittance due to their multi-layered structure, which affects their translucency and performance.
Innovation Solution
A touch sensor configuration featuring a pressure detection sensor with a piezoelectric film and an electrostatic position detection sensor, where the electrodes are arranged to form a three-layer structure instead of a four-layer structure, with specific electrode non-forming sections and materials like polylactic acid (PLLA) for improved translucency and sensitivity, and a translucent hard-coat layer for enhanced light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-layered structure with piezoelectric material and electrodes is used for pressure and position detection, then detection functionality is improved, but light transmittance degrades
Solution Approach 1:
The patent extracts and removes the transparent electrode from the multi-layered structure, retaining only the essential piezoelectric material and detection electrodes. This extraction eliminates the electrode layer that blocks light while preserving the pressure and position detection functionality through the piezoelectric effect.
Solution Approach 2:
The patent applies local quality by making the piezoelectric material itself transparent or semi-transparent, and by strategically positioning the detection electrodes to minimize their light-blocking impact. The structure transitions from uniform opacity to localized transparency where light transmission is critical.
2Measurement precision
If multiple electrode layers are arranged for position and pressure detection, then detection precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the position detection and pressure detection functions into a single integrated piezoelectric layer. The piezoelectric material simultaneously responds to both positional and pressure stimuli, eliminating the need for separate electrode layers and reducing structural complexity while maintaining dual detection capabilities.
Solution Approach 2:
The piezoelectric material serves multiple functions: it acts as both the sensing element for pressure detection and the structural base for position detection. This multi-functionality reduces the number of separate components needed, simplifying the overall device architecture.
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
The configuration enhances light transmittance and sensitivity of pressure detection while maintaining high translucency, reducing the number of electrode layers and minimizing translucency variations, resulting in a more effective touch sensor.
Implementation Method 1
a piezoelectric film including a first surface and a second surface, the first surface and the second surface being orthogonal to a thickness direction
Implementation Method 2
an electrostatic type position detection sensor including a dielectric substrate including a third surface and a fourth surface, the third surface and the fourth surface being orthogonal to the thickness direction
Data Source
AI summary
A touch sensor that includes a pressure detection sensor and a position detection sensor. The pressure detection sensor includes a piezoelectric film, a first piezoelectricity detecting electrode adjacent a first principal surface of the piezoelectric film, and a second piezoelectricity detecting electrode adjacent a second principal surface of the piezoelectric film. The position detection sensor includes a dielectric substrate, a plurality of first position detecting electrodes adjacent a first principal surface of the dielectric substrate, and a plurality of second position detecting electrodes adjacent a second principal surface of the dielectric substrate. In the pressure detection sensor, the second piezoelectricity detecting electrode includes an electrode non-forming section in a region where the first position detecting electrode and the second position detecting electrode overlap each other.