Inorganic Insulating Layer Shielding Electromagnetic Noise

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Solution Overview

Problem

Organic electroluminescence (EL) display devices generate electromagnetic noise, which can cause malfunctions in attached touch panels, and existing solutions are inadequate in reliably suppressing these adverse effects.

Innovation Solution

The implementation of a lamination structure with a substrate, a plurality of pixels, a first inorganic insulating layer covering the pixels, a conductive layer between two inorganic insulating layers, where the conductive layer is fully covered by the first and second inorganic insulating layers, effectively shielding electromagnetic noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a simple ITO film is formed on the substrate to address electromagnetic noise, then the touch panel malfunction is partially suppressed, but the electromagnetic noise suppression is insufficient and unreliable

Engineering Contradiction:

Improveelectromagnetic noise suppression reliabilityVSAvoidelectromagnetic noise interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements a nested shielding structure where the first inorganic insulating layer, conductive layer, and second inorganic insulating layer are stacked in sequence to form a multi-layer shield. The conductive layer is embedded within the insulating layers, creating a nested configuration that enhances electromagnetic noise suppression reliability compared to a single-layer ITO film

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent uses a composite shielding structure combining different material properties: inorganic insulating layers (providing insulation and structural stability) and a conductive layer (providing electromagnetic shielding). This composite approach achieves more reliable noise suppression than a single material solution

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If a conductive layer is added between inorganic insulating layers to improve shielding, then electromagnetic noise suppression is enhanced, but the device structure becomes more complex

Engineering Contradiction:

Improveelectromagnetic noise interferenceVSAvoidlamination structure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The conductive layer serves multiple functions: it provides electromagnetic shielding against noise from the display device, acts as an intermediate layer in the lamination structure, and maintains electrical connectivity. The inorganic insulating layers simultaneously provide insulation and structural support. This multi-functionality justifies the increased structural complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If the conductive layer is fully covered by inorganic insulating layers to improve shielding effectiveness, then electromagnetic noise suppression is enhanced, but the manufacturing process becomes more complex

Engineering Contradiction:

Improveelectromagnetic noise suppression reliabilityVSAvoidlamination process difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent forms the first inorganic insulating layer before depositing the conductive layer, and then forms the second inorganic insulating layer afterward. This preliminary and sequential approach ensures proper layer adhesion and alignment, making the manufacturing process more controllable despite the multiple steps involved

Inventive Principle:

Principle #10Preliminary 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

This configuration reliably suppresses the adverse effects of electromagnetic noise, preventing touch panel malfunctions and improving manufacturing efficiency by effectively shielding noise generated by the display device.

Implementation Method 1

a conductive layer on the first inorganic insulating layer, and a second inorganic insulating layer on the conductive layer, the conductive layer being between the first inorganic insulating layer and the second inorganic insulating layer

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Data Source

PatentUS11616110B2Display device and array substrate

Publication Date: 2023.03.28 MAGNOLIA WHITE CORP

AI summary

A display device according to an embodiment of the present invention includes: a substrate, a plurality of pixels on the substrate, a first inorganic insulating layer that covers the plurality of pixels, a conductive layer on the first inorganic insulating layer, and a second inorganic insulating layer that on the conductive layer, the conductive layer being between the first inorganic insulating layer and the second inorganic insulating layer, wherein the first inorganic insulating layer includes an area that is in direct contact with the second inorganic insulating layer, and all of the conductive layer is covered with the first inorganic insulating layer and the second inorganic insulating layer.