Touch Electronic Device Using Conductive Adhesive for Static Discharge

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Solution Overview

Problem

Existing touch electronic devices suffer from poor touch and display quality due to electrostatic charge accumulation, which is exacerbated by the deterioration of conductive polarizers under external environmental conditions.

Innovation Solution

A touch electronic device design featuring a conductive adhesive with specific extending directions and a polarizer with an arc edge, separated from the adhesive by a minimum distance, to facilitate effective electrostatic discharge and maintain display quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conductive polarizer is used as the antistatic layer, then electrostatic charge can be discharged, but the conductive polarizer deteriorates under external environmental conditions, affecting display quality

Engineering Contradiction:

Improveelectrostatic discharge capabilityVSAvoidpolarizer stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent divides the antistatic function from the polarizer function by using separate components: a conductive adhesive layer for electrostatic discharge and a non-conductive polarizer for optical polarization. This segmentation prevents the polarizer from deteriorating while maintaining electrostatic discharge capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a conductive adhesive as an intermediary layer between the polarizer and the touch panel. This adhesive layer performs the electrostatic discharge function, protecting the polarizer from environmental damage while maintaining the polarizer's optical properties.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If a high-impedance conductive film and conductive polarizer are used for antistatic protection, then electrostatic charge accumulation is reduced, but display quality deteriorates due to polarizer degradation

Engineering Contradiction:

Improveelectrostatic charge accumulationVSAvoiddisplay quality

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The patent separates the antistatic function (performed by conductive adhesive) from the optical function (performed by non-conductive polarizer). This allows the polarizer to maintain its optical properties without degradation from electrostatic discharge activities, preserving display quality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses a conductive adhesive layer that can be easily replaced or renewed, sacrificing this component to protect the more critical polarizer and display quality. The adhesive serves as a consumable antistatic element.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If the conductive adhesive is placed close to the polarizer, then electrostatic discharge is efficient, but the polarizer is more susceptible to environmental deterioration

Engineering Contradiction:

Improveelectrostatic discharge efficiencyVSAvoidpolarizer exposure to environment

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies conductive adhesive only in specific locations (corners or edges of the touch panel) rather than covering the entire polarizer surface. This localized application maintains electrostatic discharge efficiency while minimizing the polarizer's exposure to environmental factors.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses partial coverage of conductive adhesive (only at corners or edges) rather than full coverage, which is sufficient for electrostatic discharge while reducing the polarizer's vulnerability to environmental deterioration.

Inventive Principle:

Principle #16Partial or excessive action

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 improves touch sensitivity and accuracy while preventing display quality deterioration by efficiently discharging static charge and reducing polarizer degradation.

Implementation Method 1

a conductive adhesive disposed on the second substrate... to discharge the accumulated static charge from the conductive pads

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

the first polarizer comprises an arc edge, and the arc edge is adjacent to the conductive adhesive

Methodology Applied

Scientific EffectElectrostatic discharge: Electrostatic Discharge

Data Source

PatentUS12449920B2Touch electronic device

Publication Date: 2025.10.21 INNOLUX CORP

AI summary

An electronic device is provided, which includes: a first substrate; a second substrate; a first polarizer, wherein the first substrate is disposed between the second substrate and the first polarizer; and a conductive adhesive disposed on the second substrate, wherein from a top view of the electronic device, a first portion of the conductive adhesive contacts the second substrate and extends along a first extending direction, a second portion of the conductive adhesive contacts the first substrate and extends along a second extending direction, the first extending direction and the second extending direction are different, a length of the second portion of the conductive adhesive along the second extending direction is greater than a length of the first portion of the conductive adhesive along the first extending direction, the first polarizer comprises an arc edge, and the arc edge is adjacent to the conductive adhesive.