Polymer Foam Adhesive Tape for Pressure-Sensitive Touch Panels
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Solution Overview
Problem
Existing pressure-sensitive type touch panels face complexity in structure and thickness limitations, making it difficult to detect pressure differences effectively due to issues with signal intensity and noise in electrostatic capacitance measurements.
Innovation Solution
A polymer foam adhesive tape with a dielectric constant of 2.5 to 4.5 at 105 Hz, comprising a substrate film, a polymer foam layer, and adhesive layers, is applied to the touch part of the touch panel, enabling clear detection of pressure differences with excellent compression recovery rates and reduced noise in electrostatic signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure-sensitive type touch panel uses a housing with an empty space lattice structure to detect pressure, then pressure detection capability is achieved, but the structure becomes complicated and thickness cannot be reduced below a predetermined level
Solution Approach 1:
The patent applies porous polymer foam material as the elastic body between electrodes. The foam structure provides compressibility for pressure detection while maintaining a simple, thin-layer configuration. The porous nature of the foam allows deformation under pressure, changing the distance between electrodes and thus detecting pressure through electrostatic capacitance changes, without requiring complex lattice structures or thick housings.
2Measurement precision
If the distance between upper and lower electrodes is changed by applied pressure to detect pressure magnitude, then pressure detection sensitivity is improved, but noise in electrostatic capacitance measurement increases
Solution Approach 1:
The patent specifies controlling the dielectric constant of the polymer foam material within a specific range (2.5 to 4.5 at 105 Hz) to optimize the balance between pressure detection sensitivity and noise reduction. By selecting foam materials with appropriate density and composition, the dielectric properties are tuned to enhance the electrostatic capacitance change signal while minimizing noise interference during pressure measurement.
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 polymer foam adhesive tape enhances touch sensitivity and signal clarity by maintaining a high compression recovery rate and minimizing noise, allowing for precise detection of pressure differences and improved performance in pressure-sensitive type touch panels.
Implementation Method 1
the polymer foam adhesive tape has a dielectric constant of 2.5 to 4.5 at a frequency of 105 Hz
Implementation Method 2
A polymer foam adhesive tape according to an exemplary embodiment of the present invention may implement an excellent compression recovery rate and an excellent compression recovery speed
Data Source
AI summary
A polymer foam adhesive tape including: a substrate film; a polymer foam layer provided on one surface of the substrate film; a first adhesive layer provided on the polymer foam layer; and a second adhesive layer provided on the other surface of the substrate film, in which the polymer foam adhesive tape has a dielectric constant of 2.5 to 4.5 at a frequency of 105 Hz.