Capacitive Stylus Pen with Segmented Transparent Electrode
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Solution Overview
Problem
Conventional stylus pens for capacitive touch screens face limitations in precision due to the need for a larger tip area to provide sufficient capacitance, leading to inconvenience and input errors, especially when entering complex characters.
Innovation Solution
A stylus pen design featuring a center conductor with a smaller cross-sectional area tip portion and a larger transparent electrode plate at the tip, combined with a transparent reinforcing member, allowing for precise input while maintaining sufficient capacitance and user visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the tip portion of the stylus pen is made thin for precise input, then precision is improved, but the capacitance change becomes insufficient for the capacitive touch panel to sense touch input
Solution Approach 1:
The input portion is segmented into two distinct functional zones: a thin tip portion (0.5-2mm diameter) for precision and a larger transparent electrode plate (5-15mm diameter) for sufficient capacitance. This segmentation allows each zone to optimize its specific function without compromise.
Solution Approach 2:
The solution transitions from a one-dimensional tip size problem to a two-dimensional structure by adding the transparent electrode plate as a separate functional layer. The plate extends the effective capacitance-generating area in the lateral dimension while the thin tip maintains precision in the vertical dimension.
2Reliability
If the tip portion area is increased to provide sufficient capacitance change, then capacitance sensing is improved, but the precision of touch input deteriorates
Solution Approach 1:
The input portion is segmented into two distinct functional zones: a thin tip portion (0.5-2mm diameter) for precision and a larger transparent electrode plate (5-15mm diameter) for sufficient capacitance. This segmentation allows each zone to optimize its specific function without compromise.
Solution Approach 2:
Different parts of the input portion have different properties: the tip portion has small cross-sectional area for precision while the electrode plate has large cross-sectional area for capacitance. Each local region is optimized for its specific function.
3Reliability
If a larger area tip portion is used for capacitive touch input, then capacitance change is sufficient, but the user's view of the touch screen is blocked
Solution Approach 1:
The tip portion uses transparent or translucent material specifically at the region closest to the touch screen to maintain visibility, while the body can use opaque materials. This local transparency quality allows the tip to be visible during touch input.
Solution Approach 2:
The solution transitions from a one-dimensional tip size problem to a two-dimensional structure by adding the transparent electrode plate as a separate functional layer. The plate extends the effective capacitance-generating area in the lateral dimension while the thin tip maintains precision in the vertical dimension.
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
Enables precise and stable touch input on capacitive touch panels by ensuring a sufficient contact area and maintaining user visibility, reducing input errors and enhancing the rigidity of the stylus pen.
Implementation Method 1
A sufficient area of the tip portion is required to provide capacitance change for the capacitive type touch panel so that the capacitance touch panel is able to sense touch input
Data Source
AI summary
A stylus pen for a capacitive touch screen that allows delicate input. The stylus pen for the capacitive touch panel includes: a pen having a body extending longitudinally and an input portion positioned at one end of the body to provide touch input to the capacitive type touch panel, wherein the input portion comprises: a center conductor having a connection portion that is combined with the body and a tip portion having a cross-sectional area that is smaller than the cross-sectional area of the connection portion that is connected to the body; and a transparent electrode plate that is connected to an end of the tip portion of the center conductor opposite an end connected to the connection portion, wherein the transparent electrode plate has a cross-sectional area larger than the tip portion while defining a touch surface.