Light-Emitting Substrate Encapsulation for Water-Oxygen Barrier
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Solution Overview
Problem
Current liquid crystal display (LCD) technologies face challenges in preventing water and oxygen intrusion, leading to corrosion and reduced luminous life of light-emitting devices and substrates, especially in high-temperature and high-humidity environments.
Innovation Solution
The implementation of a light-emitting substrate design featuring a reflective layer with dam structures and encapsulation structures, where dam structures with second openings overlap with first encapsulation structures to increase the anti-water and anti-oxygen distance, and the use of white glue for enhanced protection and reflectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional encapsulation structures are used without dam structures, then the device complexity is lower, but the anti-water and anti-oxygen ability is insufficient leading to corrosion and reduced luminous life
Solution Approach 1:
The encapsulation structure is divided into multiple functional components: first encapsulation structures covering light-emitting devices, dam structures with second openings, and reflective layers with first openings. This segmentation allows each component to perform its specific function (protection, barrier, light reflection) independently, achieving superior anti-water and anti-oxygen ability while maintaining manageable complexity through functional specialization.
Solution Approach 2:
The patent implements a nested structure where dam structures are positioned within the coverage area of first encapsulation structures, and reflective layers are positioned beneath the dam structures. The orthogonal projections create nested spatial relationships where smaller functional elements are contained within larger protective structures, maximizing protection efficiency while optimizing space utilization.
2Reliability
If dam structures are added to increase anti-water and anti-oxygen distance, then the corrosion resistance is improved, but the manufacturing precision requirements increase due to overlapping positioning
Solution Approach 1:
The patent establishes predetermined spatial relationships and positioning criteria for dam structures relative to first encapsulation structures and reflective layers. By defining specific orthogonal projection requirements and overlap conditions in advance, the manufacturing process can follow established guidelines rather than requiring complex real-time adjustments, thereby reducing actual manufacturing precision requirements while ensuring consistent protection performance.
3Illumination intensity
If the reflective layer is positioned closer to light-emitting devices for better light extraction, then the light extraction efficiency is improved, but the anti-water and anti-oxygen protection is reduced
Solution Approach 1:
The patent resolves the conflict between light extraction efficiency and protection capability by utilizing vertical layering (z-dimension) rather than horizontal positioning. The reflective layer is positioned at a specific vertical depth beneath the dam structures, allowing light to be effectively extracted through optimized vertical spacing while the dam structures provide horizontal protection coverage. This dimensional separation allows both functions to operate optimally without compromising either performance.
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 design significantly improves the anti-water and anti-oxygen ability of the light-emitting substrate, enhancing corrosion resistance and extending the luminous life of light-emitting devices and substrates while maintaining high light extraction efficiency.
Implementation Method 1
The reflective layer has a plurality of first openings, and a light-emitting device is located in a first opening
Implementation Method 2
dam structures and a plurality of first encapsulation structures... significantly improves the anti-water and anti-oxygen ability
Data Source
AI summary
A light-emitting substrate includes: a substrate having a first surface; a plurality of light-emitting devices located on the first surface; a reflective layer located on the first surface, the reflective layer having a plurality of first openings, a light-emitting device being located in a first opening; a plurality of dam structures located on the reflective layer, each dam structure having a second opening, an orthogonal projection of a first opening on the substrate being located within an orthogonal projection of the second opening on the substrate; and a plurality of first encapsulation structures located on a side of the plurality of light-emitting devices away from the substrate, a first encapsulation structure covering at least one light-emitting device, the orthogonal projection of the second opening on the substrate being located within an orthographic projection of the first encapsulation structure on the substrate.