Touch Sensor Electrode Layout for Sensitivity Without Light Loss

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Solution Overview

Problem

Conductors in input sensors of electronic devices affect light output efficiency and external light reflectance, compromising touch sensitivity.

Innovation Solution

Incorporating a sensor conductive layer with first and second conductive patterns, auxiliary electrodes, and a connection line, along with a sensor insulating layer, to enhance touch sensitivity while maintaining light efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conductors are added to improve touch sensitivity, then touch sensitivity is improved, but light output efficiency and external light reflectance deteriorate

Engineering Contradiction:

Improvetouch sensitivityVSAvoidlight output efficiency

Core Design Contradiction:

Measurement precisionVSIllumination intensity

Solution Approach 1:

The conductive layer is segmented into multiple separate conductive patterns instead of using continuous conductors. This segmentation reduces the total conductive material coverage, allowing more light to pass through while maintaining touch sensitivity through distributed sensing points.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the sensor are assigned different conductive pattern densities. Areas requiring higher touch sensitivity have denser conductive patterns, while areas prioritizing light output have sparser patterns. This local optimization resolves the contradiction by allowing both functions to coexist in different spatial zones.

Inventive Principle:

Principle #3Local quality

2Measurement precision

If conductors are added to improve touch sensitivity, then touch sensitivity is improved, but external light reflectance deteriorates

Engineering Contradiction:

Improvetouch sensitivityVSAvoidexternal light reflectance

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The conductive layer is divided into discrete conductive patterns with gaps between them. This segmentation reduces the total surface area of conductive material, minimizing light reflection while preserving touch sensitivity through strategic placement of conductive elements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The conductive patterns are designed with specific optical properties including reflectance characteristics. By controlling the geometry, material composition, and arrangement of conductive patterns, the reflectance is optimized to minimize harmful light reflection while maintaining electrical functionality for touch sensing.

Inventive Principle:

Principle #32Color changes

3Measurement precision

If auxiliary electrodes and sensing electrodes are added, then touch sensitivity is improved, but device complexity increases

Engineering Contradiction:

Improvetouch sensitivityVSAvoidsensor structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The auxiliary electrodes and sensing electrodes are merged into a single integrated sensor conductive layer. This consolidation reduces the number of separate layers and components, simplifying the overall device structure while maintaining the enhanced touch sensitivity provided by the multi-electrode configuration.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The sensor conductive layer performs multiple functions simultaneously: the conductive patterns serve as both sensing electrodes for detecting touch and auxiliary electrodes for enhancing sensitivity. This multi-functionality reduces the need for separate dedicated components, thereby reducing device complexity while achieving improved touch sensitivity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Improves touch sensitivity without adversely affecting light output or reflectance, providing a more responsive user interface.

Implementation Method 1

a sensor insulating layer between the first sensor conductive layer and the second sensor conductive layer

Methodology Applied

Scientific EffectElectrical insulation: Dielectric

Implementation Method 2

The first sensing electrode, the second sensing electrode, and the third sensing electrode may be configured to operate in a self-capacitance mode

Methodology Applied

Scientific EffectCapacitance sensing: Capacitance

Data Source

PatentUS20260029867A1Electronic device

Publication Date: 2026.01.29 SAMSUNG DISPLAY CO LTD

AI summary

Disclosed is an electronic device including a first sensor conductive layer including first conductive patterns spaced apart from each other, and including a first auxiliary electrode, a second auxiliary electrode, and a third auxiliary electrode arranged along a first direction, and insulated electrically, a connection line extending along the first direction, and connected to the first auxiliary electrode, and sensing lines spaced apart from each other, a second sensor conductive layer above the first sensor conductive layer, and including second conductive patterns spaced apart from each other and including a first sensing electrode, a second sensing electrode, and a third sensing electrode arranged along the first direction, insulated electrically, and respectively connected to the sensing lines, the third sensing electrode being connected to the connection line, and a sensor insulating layer between the first sensor conductive layer and the second sensor conductive layer.