Sensor Panel Connection Wire Layout for Accurate Position Detection

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Solution Overview

Problem

The arrangement of connection wires in multiple regions in a distributed manner leads to reduced accuracy in position detection due to uneven distribution of coupling capacitance and unequal external noise magnitudes across adjacent sensor electrodes.

Innovation Solution

The position detection device includes extension lines or dummy lines that are electrically connected to the sensor controller, allowing for the derivation of position based on differential signals that account for uneven coupling capacitance and noise distributions, thereby maintaining accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If connection wires are arranged in a distributed manner across multiple regions, then the device can accommodate increased screen size and more sensor electrodes, but the coupling capacitance distribution becomes uneven, reducing position detection accuracy

Engineering Contradiction:

Improveaccommodation of increased screen size and sensor electrodesVSAvoidposition detection accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

Extension lines are introduced as intermediary elements to connect sensor electrodes located in different regions. These extension lines act as mediators that establish additional coupling capacitance paths between adjacent sensor electrodes across region boundaries, thereby equalizing the coupling capacitance distribution and maintaining position detection accuracy while supporting distributed wire arrangement for larger screens

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If connection wires are arranged in a distributed manner, then the device can handle increased number of sensor electrodes, but external noise superposition varies across different regions, reducing position derivation accuracy

Engineering Contradiction:

Improvenumber of sensor electrodesVSAvoidposition derivation accuracy

Core Design Contradiction:

Quantity of substanceVSMeasurement precision

Solution Approach 1:

Extension lines serve as intermediary pathways that transmit external noise signals from one region to another. By providing these additional coupling paths, extension lines ensure that adjacent sensor electrodes across region boundaries experience similar external noise superposition, which is crucial for maintaining the effectiveness of differential measurements and position derivation accuracy

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If extension lines are added to equalize coupling capacitance, then position detection accuracy is maintained, but device complexity increases

Engineering Contradiction:

Improveposition detection accuracyVSAvoidconnection wire structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The extension lines are merged with the existing connection wire structure and integrated into the flexible printed circuit board. Rather than adding completely separate components, the extension lines are combined with the routing lines and FPC wires, sharing the same physical medium and control infrastructure, thereby minimizing the increase in device complexity while achieving the coupling capacitance equalization

Inventive Principle:

Principle #5Merging (Combining)

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 proposed solution minimizes the reduction in accuracy caused by distributed connection wires by ensuring a consistent distribution of coupling capacitance and effectively canceling out external noise, thus maintaining precise position detection.

Implementation Method 1

coupling capacitance occurs between adjacent ones of the sensor electrodes and between adjacent ones of the connection wires

Methodology Applied

Scientific EffectCoupling capacitance: Capacitance

Implementation Method 2

the differential method causes external noises to be canceled out when the differentials are derived

Methodology Applied

Scientific EffectDifferential measurement:

Data Source

PatentUS20250068278A1Extension wires and connection wires for position detection device and sensor panel

Publication Date: 2025.02.27 WACOM CO LTD

AI summary

A position detection device includes first and second sensor electrodes that are adjacent to each other, connection wires connected to the respective sensor electrodes and including first and second connection wires connected to the first and second sensor electrodes, respectively, a sensor controller connected to the connection wires, and a first extension line; and a second extension line. Some of the plurality of connection wires, including the first connection wire, extend at regular intervals in a first region. The connection wires, including the second connection wire, are arranged to extend at regular intervals in a second region different from the first region. The first extension line extends along the second connection wire in the second region and is electrically connected to the first sensor electrode. The second extension line extends along the first connection wire in the first region and is electrically connected to the second sensor electrode.