Display Device Block Patterns for Encapsulation Reflow Control
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Solution Overview
Problem
The challenge in display devices is to reduce the thickness and allow bending or folding while minimizing the dead space created by additional block patterns used to control the reflow of flexible materials in thin film encapsulation structures, which typically increases the overall thickness and dead space in non-active regions.
Innovation Solution
A display device design with a substrate having active and non-active regions, where the number of block patterns in the non-active regions is strategically varied to control the reflow of the encapsulation material, with a closed curve pattern surrounding the active region, and a specific arrangement of block patterns in different non-active regions to mitigate material reflow and reduce dead space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of block patterns are added to control reflow of flexible material, then reflow control is improved, but dead space of the display panel increases
Solution Approach 1:
The patent applies different numbers of block patterns to different non-active regions based on their specific requirements. The first non-active region (adjacent to short side) receives more block patterns for enhanced reflow control, while the second non-active region (adjacent to long side) receives fewer block patterns to minimize dead space. This localized differentiation resolves the contradiction by optimizing reflow control only where necessary.
Solution Approach 2:
The patent segments the non-active region into multiple sub-regions (first non-active region and second non-active region) with different block pattern densities. This segmentation allows independent optimization of each region - one prioritizing reflow control and the other prioritizing dead space reduction - thereby resolving the overall contradiction.
2Reliability
If additional block patterns are added to the non-active region, then encapsulation reliability is improved, but the overall thickness of the display device increases
Solution Approach 1:
The patent implements local quality by concentrating block patterns only in the first non-active region where reflow control is critical, while minimizing or eliminating them in the second non-active region. This selective placement maintains encapsulation reliability where needed while avoiding unnecessary thickness increase in regions where it is less critical.
Solution Approach 2:
The patent applies partial action by providing sufficient block patterns only in the first non-active region to achieve adequate reflow control, rather than uniformly distributing block patterns across all non-active regions. This partial application achieves the necessary encapsulation reliability without the excessive thickness that would result from uniform distribution.
Data Source
AI summary
A display device includes a substrate on which an active region and a non-active region disposed are defined. The non-active region at least partially surrounds the active region. A light-emitting element is disposed in the active region on the substrate. An encapsulation layer is disposed on the light-emitting element. Block patterns are disposed in the non-active region on the substrate and at least partially surround the active region. The non-active region includes a first non-active region positioned at a first side of the active region and a second non-active region positioned at a second side of the active region. There are more block patterns disposed in the first non-active region than in the second non-active region.