Capacitive Pen Sensor Layout for Peripheral Signal Reception
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Solution Overview
Problem
Existing pen sensors face issues with peripheral sensor electrodes failing to correctly receive pen signals due to reduced signal levels, leading to increased costs and reduced transmittance from the requirement of a conductive cover film.
Innovation Solution
A pen sensor design with a two-layer structure of sensor electrodes and dummy patterns, where conductor patterns in each layer are overlaid to generate capacitance, allowing pen signals to propagate efficiently without a conductive cover film, thus maintaining signal reception and avoiding cost and transmittance issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive cover film is used to help peripheral sensor electrodes receive pen signals, then signal reception is improved, but manufacturing cost increases and transmittance decreases
Solution Approach 1:
The patent uses dummy patterns that replicate the structure and electrical characteristics of sensor electrodes to create virtual signal paths. These dummy patterns are arranged to extend signal propagation paths and improve coupling between peripheral sensor electrodes and the pen, achieving signal reception enhancement without requiring additional conductive cover films.
Solution Approach 2:
The patent introduces a temporal dimension by applying AC voltage signals at specific frequencies to the dummy patterns, creating time-varying electric fields that enhance signal coupling. This dynamic approach allows peripheral sensor electrodes to receive pen signals more effectively without adding physical conductive layers.
2Reliability
If a conductive cover film is used to help peripheral sensor electrodes receive pen signals, then signal reception is improved, but transmittance decreases
Solution Approach 1:
The dummy patterns create virtual signal paths that replicate the function of additional conductive structures without physically blocking light. By using patterned conductors on existing transparent layers rather than adding opaque conductive films, the solution maintains high transmittance while improving signal reception.
3Reliability
If dummy patterns are added to the sensor structure, then signal propagation is improved, but device complexity increases
Solution Approach 1:
The dummy patterns serve multiple functions simultaneously: they extend signal propagation paths, create capacitive coupling elements, and can be integrated with existing transparent electrode structures. This multi-functionality approach improves signal propagation without requiring separate dedicated components for each function.
Solution Approach 2:
The patent merges the dummy patterns with existing transparent conductor layers and sensor electrode structures, combining multiple functions into unified structural elements. This integration approach reduces the number of discrete components and simplifies the overall device architecture while maintaining improved signal propagation.
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 design enables full reception of pen signals by peripheral sensor electrodes while preventing cost increases and maintaining uniform transmittance, ensuring consistent signal reception sensitivity across the panel surface.
Implementation Method 1
a pen signal transmitted from the active pen propagates in a planar direction by way of capacitance generated between the first conductor patterns and the second conductor patterns formed to be overlaid with each other when viewed from above
Data Source
AI summary
A pen sensor for use in detecting an active pen with capacitive coupling. The pen sensor includes a first layer and a second layer. The first layer includes a plurality of first sensor electrodes and a plurality of first dummy patterns. The second layer includes a plurality of second sensor electrodes and a plurality of second dummy patterns. The first dummy patterns and the second dummy patterns are overlaid with each other when viewed from above the pen sensor. The first dummy patterns of the first layer are insulated from each other. The second dummy patterns of the second layer are insulated from each other.