Capacitive Sensor Trace Patterning for Edge-to-Edge Displays

Solution Overview

Problem

Existing proximity sensor devices face challenges in detecting input objects due to the layout of electrodes and traces, which can impact detectability and visual appearance, especially in edge-to-edge displays where conductive traces are difficult to hide.

Innovation Solution

The implementation of a capacitive sensing system with a first and second electrode layer separated by an insulating layer, where capacitive sensing elements are organized in rows and columns, sharing common electrodes to reduce the number of conductive traces and enhance detection accuracy while minimizing visual interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If traditional electrode layouts with separate traces for each electrode are used, then detection accuracy is maintained, but visual appearance deteriorates due to visible conductive traces in edge-to-edge displays

Engineering Contradiction:

Improvevisual appearanceVSAvoiddetection accuracy

Core Design Contradiction:

Illumination intensityVSMeasurement precision

Solution Approach 1:

The patent merges multiple electrode traces into shared trace structures. Specifically, multiple capacitive sensing elements in adjacent rows share common first electrodes and traces in the first electrode layer, reducing the total number of conductive traces required while maintaining sensing functionality across all elements.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The shared electrodes and traces serve multiple functions simultaneously. A single trace or electrode in the first layer serves as a common connection for multiple capacitive sensing elements, enabling one structure to perform the function of what would traditionally require multiple separate traces.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If separate conductive traces are provided for each electrode, then detection accuracy is maintained, but device complexity increases due to more traces and manufacturing steps

Engineering Contradiction:

Improvedetection accuracyVSAvoidtrace configuration

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges multiple electrode traces into shared trace structures. Specifically, multiple capacitive sensing elements in adjacent rows share common first electrodes and traces in the first electrode layer, reducing the total number of conductive traces required while maintaining sensing functionality across all elements.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of operation

If separate conductive traces are provided for each electrode, then individual electrode control is maintained, but manufacturing complexity increases

Engineering Contradiction:

Improveelectrode controlVSAvoidmanufacturing process

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The patent merges multiple electrode traces into shared trace structures. Specifically, multiple capacitive sensing elements in adjacent rows share common first electrodes and traces in the first electrode layer, reducing the total number of conductive traces required while maintaining sensing functionality across all elements.

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

This configuration improves the usability and visual appeal of input devices by reducing the number of conductive traces, maintaining detection accuracy, and simplifying manufacturing, particularly suitable for edge-to-edge displays.

Implementation Method 1

a plurality of capacitive sensing elements organized in rows and columns, wherein each of the capacitive sensing elements is formed by one of the plurality of electrodes in the first electrode layer and one of the plurality of electrodes in the second electrode layer

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS10831325B2Sensor patterning with reduced trace visibility for capacitance sensing

Publication Date: 2020.11.10 SYNAPTICS INC

AI summary

An input device includes a first electrode layer including electrodes, a second electrode layer including electrodes, an insulating layer disposed between the first and the second electrode layers, and capacitive sensing elements organized in rows and columns. Each of the capacitive sensing elements is formed by one of the electrodes in the first electrode layer and one of the electrodes in the second electrode layer. A set of the capacitive sensing elements organized in adjacent rows shares a common first electrode in the first electrode layer. Each of the capacitive sensing elements in the set of capacitive sensing elements is associated with a distinct electrode of the electrodes in the second electrode layer.