Touch Sensor Detection Electrodes With Conductive-Particle Connections

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Solution Overview

Problem

Conventional methods for connecting external electric lines such as FPCs to display panels and touch panels in organic EL display devices are laborious and lack stability in electrical connections, particularly when a multilayer barrier is used to cover the organic layer.

Innovation Solution

A display device structure with a first laminated structure on the display panel and a second laminated structure on the touch panel, including a multilayer barrier and conductive particles for stable electrical connections, facilitates the attachment of external lines by forming first detection lines that extend from the seal region to the connection region, with the organic barrier layer's peripheral edge located inward from the conductive particles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If external electric lines such as FPCs are connected to display panel and touch panel separately using conventional methods, then electrical connection is achieved, but laborious works are necessary and connection stability is poor

Engineering Contradiction:

Improveconnection stabilityVSAvoidconnection complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent combines the display panel and touch panel into a single integrated structure where the touch panel is formed on the same substrate as the display panel. The detection electrodes and signal lines are integrated with the display circuitry, allowing external electric lines to connect to both panels simultaneously through a single connection point, thereby improving connection stability and reducing manufacturing complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates a multi-functional structure where the same substrate and circuit layers serve both display and touch detection functions. The signal lines function as both display control lines and touch detection lines, eliminating the need for separate connection structures for each panel and simplifying the overall connection process

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Object-affected harmful factors

If multilayer barrier is used to cover organic layer in organic EL display device, then moisture protection is improved, but connection stability of external electric lines deteriorates

Engineering Contradiction:

Improvemoisture protectionVSAvoidelectrical connection stability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent segments the barrier structure into multiple functional layers: an organic EL display layer with multilayer barrier for moisture protection, and a touch panel layer with conductive particles and detection electrodes for electrical connection. This segmentation allows the barrier to protect the organic layer while the touch panel layer provides stable electrical connections through conductive particles that penetrate or contact the barrier structure

Inventive Principle:

Principle #1Segmentation

3Ease of manufacture

If first detection line extends from seal region to connection region, then connection process is simplified, but device structure complexity increases

Engineering Contradiction:

Improveconnection process simplicityVSAvoidlaminated structure complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The first detection line serves dual functions: it acts as both a structural element connecting the seal region to the connection region, and as an electrical conduction path for the touch detection circuit. This multi-functionality simplifies the connection process by eliminating the need for separate connection structures while the laminated structure integrates multiple functions into cohesive layers

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

This structure simplifies the connection process for external lines and enhances the stability of electrical connections, while maintaining the integrity of the multilayer barrier's moisture protection, allowing for flexible design and reduced device size.

Implementation Method 1

The first laminated structure includes a first detection line extending from the seal region to the connection region and electrically connected to the terminal of the second detection line through the conductive particle

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS12436635B2Semiconductor device including detection electrodes applicable for a touch sensor

Publication Date: 2025.10.07 MAGNOLIA WHITE CORP

AI summary

A sealing member containing conductive particles and disposed in a seal region is formed between a display panel and a touch panel. A laminated structure formed on the display panel includes a first detection lines. The first detection lines extend from the seal region to a connection region and are connected through the conductive particles to terminals of second detection lines formed on the touch panel. A peripheral edge of the organic barrier is located inward from the conductive particles of the sealing member. The above described structure can facilitate a work for connecting external lines such as FPC to the display panel and the touch panel. Further, the structure can secure stability of electrical connection between the external lines and the touch panel.