Touch Panel with Radially Varying Capacitance Overlap
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Solution Overview
Problem
Touch panels require higher precision in position control to accurately sense fine variations in touch location, which existing technologies struggle to achieve effectively.
Innovation Solution
A touch panel design featuring a base portion with varying thickness under pressure, incorporating first and second conductive pattern units on opposing surfaces with overlapping regions where the overlapping area decreases radially from a center point, allowing for precise recognition of touch inputs by varying electrostatic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional touch panel structures are used, then manufacturing is simpler, but touch recognition precision is insufficient
Solution Approach 1:
The touch panel divides the sensing function into two separate conductive pattern units located on opposite surfaces of the base portion. Each unit independently contributes to capacitance sensing, enabling more precise touch location detection through differential measurement of capacitance changes between the separated pattern units.
Solution Approach 2:
The patent transitions from a single-surface conductive pattern to a dual-surface configuration where conductive patterns are arranged on both the front and back surfaces of the base portion. This spatial dimensionality change enables three-dimensional capacitance field sensing, improving touch position accuracy by detecting electric field variations from multiple perspectives.
2Measurement precision
If uniform overlapping area between conductive patterns is used, then manufacturing is easier, but sensitivity to fine touch variations is reduced
Solution Approach 1:
The overlapping area between corresponding conductive patterns on opposite surfaces is designed to vary by location rather than remain uniform. Specifically, the overlapping area is larger at the center region and smaller at peripheral regions, creating location-dependent capacitance characteristics that enhance sensitivity to fine touch position variations while maintaining manufacturability through controlled pattern design.
3Measurement precision
If base portion thickness is fixed, then structural stability is higher, but pressure sensitivity is reduced
Solution Approach 1:
The base portion is designed with variable thickness rather than a fixed uniform thickness. This dynamic structural characteristic allows the base to flex and deform in response to applied pressure, changing the distance between conductive patterns on opposite surfaces. The thickness variation enables the base to translate mechanical pressure into electrical signal changes while maintaining overall structural stability through its graduated thickness profile.
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 design enhances touch recognition precision and user convenience by differentiating touch inputs based on the magnitude and kind of electric signals generated, improving sensitivity and accuracy in detecting touch locations.
Implementation Method 1
When a user touches the touch panel, it is necessary to sense a fine variation of the touch location on the touch panel
Implementation Method 2
a base portion having a thickness that varies according to applied pressure
Data Source
AI summary
A touch panel including a base portion having a thickness that varies according to applied pressure; a first conductive pattern unit disposed on a first surface of the base portion and including first conductive patterns; and a second conductive pattern unit disposed on a second surface of the base portion opposing the first conductive pattern and including second conductive patterns that overlap with the first conductive patterns. Each of the first conductive patterns includes regions overlapping with the second conductive patterns, and in one of the overlapping regions, an amount of overlapping area between the first conductive pattern and the second conductive pattern decreases the farther away radially the overlapping area is from a center point of the overlapping region.