Active 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 when a conductive cover film is used to enhance signal reception.
Innovation Solution
A pen sensor design with a two-layer structure comprising sensor electrodes and dummy patterns that generate capacitance between overlaid conductor patterns, allowing pen signals to propagate efficiently without the need for a conductive cover film, thereby 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 enhance signal reception by peripheral sensor electrodes, then signal reception is improved, but manufacturing cost increases and transmittance is reduced
Solution Approach 1:
The patent creates a virtual conductive layer by overlaying dummy patterns from the first and second sensor electrode layers. These dummy patterns generate capacitance that mimics the effect of a physical conductive cover film, allowing peripheral sensor electrodes to receive pen signals without requiring an additional conductive film layer.
Solution Approach 2:
The patent merges the functional roles of the first and second sensor electrode layers by having their dummy patterns overlay each other. This combination creates a capacitive effect that replaces the need for a separate conductive cover film, achieving signal enhancement through integration of existing layers.
2Reliability
If a conductive cover film is used to enhance signal reception by peripheral sensor electrodes, then signal reception is improved, but transmittance is reduced
Solution Approach 1:
The patent creates a virtual conductive layer through capacitive coupling between dummy patterns, eliminating the need for a physical conductive cover film that would block light. This virtual layer provides the necessary electrical function without the optical drawbacks of a physical film.
Solution Approach 2:
The patent replaces the mechanical/physical conductive cover film with an electrical field-based solution using capacitive coupling between dummy patterns. This substitution eliminates the need for a physical barrier that would reduce light transmittance while maintaining the electrical function of signal reception.
3Area of stationary object
If peripheral sensor electrodes are used to detect pen position, then detection coverage is improved, but signal level is reduced leading to incorrect position derivation
Solution Approach 1:
The patent introduces dummy patterns as intermediary elements between the pen signal source and peripheral sensor electrodes. These dummy patterns generate capacitance that acts as a mediator to boost the signal level reaching peripheral electrodes, enabling accurate position detection across the entire sensor area.
Solution Approach 2:
The patent adds a capacitive dimension to the signal transmission path by utilizing the electric field between overlaid dummy patterns from different layers. This creates an additional signal propagation pathway that enhances the signal strength available to peripheral sensor electrodes without expanding the physical sensor area.
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 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
Provided is a pen sensor for use in detecting an active pen. The pen sensor includes a first layer including a group of first sensor electrodes and a group of first dummy patterns, and a second layer including a group of second sensor electrodes and a group 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.