Inorganic LED Pixel Encapsulation Against Moisture-Induced Corrosion
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Solution Overview
Problem
Inorganic electroluminescent displays with inorganic light-emitting diodes are susceptible to moisture ingress, which can cause corrosion of electrodes and wiring, leading to reduced luminous efficiency and deteriorated display characteristics.
Innovation Solution
A display device comprising a substrate with arrayed pixels, each equipped with an inorganic light-emitting element, surrounded by a flattening film and covered by an inorganic film that prevents moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If inorganic light-emitting elements are used in display devices, then luminous efficiency is improved and environmental resistance is enhanced, but susceptibility to moisture ingress causing corrosion of electrodes and wiring increases
Solution Approach 1:
The patent implements a nested protective structure where an inorganic film is embedded within an organic film to form a composite encapsulation layer. The inorganic film (first protective film) is positioned inside the organic film (second protective film), creating a multi-layer nested configuration that provides enhanced moisture barrier properties while protecting the light-emitting elements.
Solution Approach 2:
The patent employs a composite encapsulation structure combining inorganic and organic materials. The inorganic film provides excellent moisture barrier properties, while the organic film offers flexibility and additional protection. This composite approach leverages the complementary advantages of both material types to achieve superior moisture resistance.
2Reliability
If protective films are added to prevent moisture ingress, then reliability is improved, but device complexity increases
Solution Approach 1:
The encapsulation structure serves multiple functions simultaneously: the inorganic film provides the primary moisture barrier, the organic film provides additional protection and flexibility, and together they form a unified protective system that simplifies the overall device architecture while enhancing reliability.
Solution Approach 2:
By nesting the inorganic film within the organic film, the patent creates a compact multi-layer structure that maximizes protective functionality while minimizing space occupation and structural complexity. This nested configuration allows both films to work together in a space-efficient manner.
Data Source
AI summary
A display device including a substrate, a plurality of pixels, a plurality of inorganic light-emitting elements, a flattening film, and an inorganic film. The pixels are arrayed on the substrate and display different colors. The inorganic light-emitting elements are provided to the respective pixels. The flattening film surrounds at least a side surface of the inorganic light-emitting element. The inorganic film covers the flattening film and the inorganic light-emitting element. The upper surface of the inorganic light-emitting element is exposed from the flattening film and is in contact with the inorganic film. Alternatively, the flattening film is provided covering the upper surface of the inorganic light-emitting element.