Display Device Multi-Layer Protective Structure Impurity Barrier
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Solution Overview
Problem
Existing display devices face challenges in preventing impurities, such as moisture, from penetrating through the protective layer, which can compromise the device's performance and reliability.
Innovation Solution
A display device design that includes a partition wall with a multi-layered protective structure, comprising a first protective layer made of silicon nitride or silicon oxide and a second protective layer made of an amorphous material, which together provide enhanced coverage and protection against external impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single protective layer is used, then the device structure is simple, but the protection against impurities is insufficient
Solution Approach 1:
The protective layer is divided into multiple distinct layers (first protective layer, second protective layer, third protective layer) with different materials and functions. Each layer provides specific protection against different types of impurities, collectively achieving comprehensive protection that a single layer cannot provide.
Solution Approach 2:
The protective structure uses composite materials with different properties - inorganic materials (silicon nitride, silicon oxide) for moisture barrier, organic materials (acryl resin, epoxy resin) for flexibility and adhesion. This composite approach creates synergistic effects that improve overall protection while managing the complexity through functional specialization.
2Reliability
If the protective layer completely covers the light emitting part, then protection is maximized, but light emission is blocked
Solution Approach 1:
The protective layers have varying transparency properties at different locations. The first protective layer (silicon nitride) is transparent to visible light, allowing light emission while providing moisture barrier. The second protective layer (acryl resin) provides additional protection while maintaining light transmission. This local differentiation of material properties enables simultaneous protection and light emission.
Solution Approach 2:
The protective layers are designed with partial coverage strategy - they cover the light emitting part sufficiently to provide protection against impurities, but are configured to allow light transmission through transparent materials. The coverage is optimized to be just enough for protection without excessive blocking of light.
3Reliability
If a thick protective layer is used, then protection is enhanced, but manufacturing precision is compromised
Solution Approach 1:
Instead of forming one thick protective layer that is difficult to control with high precision, the structure is segmented into multiple thinner layers. Each thin layer can be deposited with better control and uniformity, achieving the cumulative protection effect while maintaining manufacturing precision for each individual layer.
Solution Approach 2:
The protective structure extends in the vertical dimension with multiple stacked layers rather than relying on a single thick layer in one dimension. This dimensional approach allows each layer to be thinner and more precisely controlled while achieving the same or better overall protection through the stacked configuration.
Data Source
AI summary
A display device includes a partition wall disposed on a base layer; a light emitting part disposed adjacent to the partition wall; an upper light emitting part disposed on the partition wall; a first protective layer disposed on the light emitting part; and a second protective layer disposed on the first protective layer. The first protective layer entirely overlaps the light emitting part in a plan view, and the second protective layer does not overlap at least a portion of the light emitting part and at least a portion of the first protective layer in a plan view.