Stretchable Touch Panel With High Permittivity Layer
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Solution Overview
Problem
Touch panels with resin substrates face limitations in detection sensitivity due to the relatively low permittivity of resin materials, which affects the capacitance between detection electrodes and fingers, thereby reducing detection accuracy.
Innovation Solution
A touch panel design incorporating a stretchable array substrate, a touch detection electrode, and a resin plate with a recessed surface featuring a high permittivity layer, ensuring the high permittivity layer overlaps with the detection electrode, enhancing capacitance and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a resin plate is used as the dielectric in the touch panel, then the touch panel achieves flexibility and elasticity, but the detection sensitivity deteriorates due to the low permittivity of resin material
Solution Approach 1:
The patent applies local quality by forming a high permittivity layer only in specific regions where detection electrodes are located, while the rest of the resin plate maintains its original low permittivity properties. This localized modification allows the touch panel to achieve high detection sensitivity at electrode positions without compromising the overall flexibility and elasticity of the resin substrate.
Solution Approach 2:
The patent uses composite materials by combining resin material with high permittivity material to create a layered structure. The resin plate serves as the base flexible substrate, while the high permittivity layer (formed by depositing materials such as metal oxides or organic-inorganic hybrid materials) is applied selectively to enhance capacitance and detection sensitivity without sacrificing the flexible characteristics of the resin base.
2Measurement precision
If a high permittivity dielectric is used to improve detection sensitivity, then the capacitance between detection electrode and finger increases, but the flexibility and elasticity of the resin substrate are compromised
Solution Approach 1:
The high permittivity layer is formed only in regions corresponding to detection electrodes, not across the entire resin plate. This localized approach ensures that flexibility and elasticity are maintained in areas where the high permittivity material is not present, while still achieving improved detection sensitivity at the electrode positions where the high permittivity layer is applied.
Solution Approach 2:
The dielectric structure is segmented into two distinct parts: the resin plate providing flexibility and elasticity, and the high permittivity layer providing enhanced capacitance. This segmentation allows each material to perform its optimal function without compromising the other - the resin substrate maintains mechanical properties while the high permittivity layer enhances electrical properties.
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 integration of a high permittivity layer on the resin plate increases the capacitance between the finger and detection electrode, improving detection sensitivity while maintaining the resin's elasticity and durability.
Implementation Method 1
A dielectric with high permittivity is preferably used because it increases the capacitance between the detection electrode and the finger, thereby improving the detection sensitivity
Implementation Method 2
The relative permittivity of resin material, however, is not high. Therefore, it is desired to improve the detection sensitivity
Data Source
AI summary
According to an aspect, a touch panel includes, in sequence: a stretchable array substrate, a touch detection electrode; and a resin plate. The resin plate has: a facing surface facing the touch detection electrode; and a detection surface facing opposite to the facing surface. The facing surface or the detection surface has a recessed surface. The recessed surface is provided with a high permittivity layer having permittivity higher than permittivity of the resin plate. The touch detection electrode and the high permittivity layer overlap when viewed in a stacking direction in which the stretchable array substrate, the touch detection electrode, and the resin plate are stacked.