Integrated Touch Display Insulation Layer Adhesion

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Solution Overview

Problem

In organic light emitting display devices with integrated touch screens, the organic layer can partially detach due to low interface adhesive force between the organic layer and the touch electrodes, leading to reliability issues.

Innovation Solution

A display device with an integrated touch screen is designed, featuring a touch sensing layer that includes a touch inorganic layer covering the second touch electrode layer and a touch organic layer disposed on the inorganic layer, enhancing the interface adhesive force and preventing partial detachment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an organic layer is provided between touch electrodes and bridge electrodes for insulation, then electrical insulation is achieved, but interface adhesive force is low causing partial detachment

Engineering Contradiction:

Improveinterface adhesive forceVSAvoidlayer detachment

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent applies composite materials by creating a multilayer structure consisting of an organic layer and an inorganic layer. The organic layer provides electrical insulation between the touch electrodes and bridge electrodes, while the inorganic layer enhances interface adhesive force to prevent partial detachment. This composite structure combines the advantages of both material types to simultaneously achieve insulation and structural stability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The inorganic layer serves as an intermediary between the organic layer and the touch electrodes/bridge electrodes. It mediates the interface between these components, providing both mechanical adhesion to prevent detachment and maintaining the electrical insulation properties of the organic layer. The inorganic layer acts as a bonding interface that strengthens the overall structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the organic layer is placed directly on touch electrodes or bridge electrodes, then simple structure is achieved, but adhesive force is insufficient leading to detachment

Engineering Contradiction:

Improvelayer adhesionVSAvoidlayer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces a composite material system with an organic layer and an inorganic layer. The inorganic layer is specifically positioned between the organic layer and the electrodes to provide enhanced adhesion. This composite approach increases reliability through improved bonding while adding only one additional functional layer to the structure.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS11579719B2Display device with integrated touch screen and method of manufacturing the same

Publication Date: 2023.02.14 LG DISPLAY CO LTD

AI summary

Disclosed are a display device with integrated touch screen and a method of manufacturing the same, which prevent the partial detachment of an organic layer. The display device includes a light emitting device layer including a first electrode disposed on a first substrate, a light emitting layer disposed on the first electrode, and a second electrode disposed on the light emitting layer and a touch sensing layer disposed on the light emitting device layer. The touch sensing layer includes a first touch electrode layer, a second touch electrode layer, and a touch insulation layer disposed therebetween, and the touch insulation layer includes a touch inorganic layer covering the second touch electrode layer and a touch organic layer disposed on the touch inorganic layer.