Display Device Bezel Irregularity Pattern Moisture Crack Protection

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Solution Overview

Problem

Display devices face issues with moisture permeation and cracking when a portion of the substrate is removed to accommodate optical electronic devices, leading to reduced display area and potential deterioration of display quality.

Innovation Solution

A display device design featuring a substrate with an open area where a portion has been removed, incorporating subpixels with light emitting elements and transistors, encapsulation layers, and a protection layer, along with an irregularity pattern in the bezel area formed by removing an organic insulation film layer, which separates the light emitting layer and prevents moisture ingress.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a portion of the substrate is removed to accommodate optical electronic devices, then the optical electronic device can be installed in the display area, but moisture may penetrate into the removed area causing deterioration of display quality

Engineering Contradiction:

Improveintegration of optical electronic devicesVSAvoiddisplay quality

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent divides the encapsulation layer into multiple segments: a first encapsulation layer covering the light emitting element, a second encapsulation layer covering the first encapsulation layer and extending to the bezel area, and a third encapsulation layer covering the second encapsulation layer. This segmented approach creates multiple barriers against moisture penetration while accommodating the open area for optical devices.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary structure (the extended second encapsulation layer and bezel area configuration) between the light emitting element and the external environment. This intermediary acts as a buffer zone that prevents direct moisture contact with critical components while allowing optical device integration.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If a portion of the substrate is removed to accommodate optical electronic devices, then the optical electronic device can be installed, but cracks may occur during the removal process

Engineering Contradiction:

Improveintegration of optical electronic devicesVSAvoidsubstrate integrity

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The patent applies beforehand cushioning by extending the second encapsulation layer into the bezel area before the open area is formed. This pre-established protective layer acts as a cushion that prevents cracks from propagating into critical display areas during the substrate removal process.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The patent uses thin film encapsulation layers that can flex and adapt to the structural changes during substrate removal. These flexible thin films maintain integrity while accommodating the open area, preventing crack formation.

Inventive Principle:

Principle #30Flexible shells and thin films

3Quantity of substance

If the protection layer extends to the edge of the open area, then coverage is maximized, but moisture can more easily penetrate along the edge

Engineering Contradiction:

Improveencapsulation coverageVSAvoidmoisture permeation

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The patent addresses moisture penetration by transitioning from a two-dimensional planar encapsulation to a three-dimensional multi-layer structure. The second encapsulation layer extends vertically and horizontally into the bezel area, creating a stepped configuration that blocks moisture paths while maintaining edge coverage.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent employs composite encapsulation structures with multiple material layers (first, second, and third encapsulation layers with different properties) working together. This composite approach provides both comprehensive coverage and enhanced resistance to moisture penetration at the edges.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS20230209918A1Display device

Publication Date: 2023.06.29 LG DISPLAY CO LTD

AI summary

A display device comprising a display panel is disclosed that protects against moisture and crack. The display panel is formed on a substrate and includes an open area where at least a portion of the substrate has been removed, a display area in which images are displayed and the open area is positioned, wherein in the display area, one or more subpixels each including a light emitting element and at least one transistor for driving the light emitting element are positioned on the substrate, and one or more encapsulation layers covering the light emitting element and a protection layer positioned on the one or more encapsulation layers are positioned, and a bezel area bordering at least one edge of the open area and including a non-planar pattern formed as at least a portion of at least one organic insulation film layer positioned on the substrate.