Display Device Substrate Hole and Moisture Barrier

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Solution Overview

Problem

Conventional display devices face limitations in maximizing display area due to the presence of non-display areas, such as bezels, which house components like cameras and sensors, leading to reduced screen real estate.

Innovation Solution

The integration of a substrate hole surrounded by light-emitting elements and a moisture penetration preventing layer between the inner dam and the substrate hole, allowing for the placement of components like cameras within the active area while protecting the light-emitting stacks from external moisture and oxygen.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If a substrate hole is disposed within the active area to reduce non-display area, then display area utilization is enhanced, but light-emitting stacks may be damaged by external moisture or oxygen

Engineering Contradiction:

Improvedisplay areaVSAvoidlight emitting stack protection

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The patent employs a moisture penetration preventing layer as a thin film barrier to protect the light-emitting stacks from moisture and oxygen. This thin film approach provides effective protection without significantly increasing the structural complexity or occupying additional space within the substrate hole configuration.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The moisture penetration preventing layer acts as an intermediary barrier between the external environment (moisture and oxygen) and the light-emitting stacks. This intermediate layer protects the sensitive components while allowing the substrate hole configuration to maintain its space-saving advantages.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a moisture penetration preventing layer is added to protect light emitting stacks, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improvelight emitting stack protectionVSAvoidlayer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The moisture penetration preventing layer is implemented as a thin film structure that provides necessary protection with minimal addition to the overall device complexity. The thin film approach allows for effective moisture barrier functionality while maintaining a relatively simple and compact device architecture.

Inventive Principle:

Principle #30Flexible shells and thin films

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 minimizes the non-display area by incorporating functional components within the active display region, enhancing the display area utilization and protecting the light-emitting elements from damage.

Implementation Method 1

a moisture penetration preventing layer disposed between an inner dam surrounded by the light emitting elements and the substrate hole

Methodology Applied

Scientific EffectPermeation barrier: Diffusion Barrier

Data Source

PatentUS11575109B2Display device

Publication Date: 2023.02.07 LG DISPLAY CO LTD

AI summary

A display device capable of reducing a non-display area includes a substrate hole surrounded by light emitting elements, and a moisture penetration preventing layer disposed between an inner dam surrounded by the light emitting elements and the substrate hole. Accordingly, it is possible to prevent damage to light emitting stacks caused by external moisture or oxygen. Since the substrate hole is disposed within an active area, a reduction in non-display area is achieved.