Display Through-Hole Barrier Structure for Moisture-Resistant OLED Pixels
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Solution Overview
Problem
Organic EL display devices with through-holes in the display region face reliability issues due to moisture and oxygen ingress, leading to deterioration of the light-emitting layer and decreased performance.
Innovation Solution
A display device structure featuring a substrate with a plurality of pixels, a sealing film comprising inorganic and organic insulating layers, and a through hole passing through the substrate and sealing film, where the inorganic insulating layers are in direct contact in the moisture blocking region to prevent moisture and oxygen entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a through hole is arranged in the display region, then design flexibility is improved, but moisture and oxygen ingress occurs leading to deterioration of the light-emitting layer
Solution Approach 1:
An inert gas filling layer is introduced as an intermediary substance within the through hole to prevent moisture and oxygen from reaching the light-emitting layer. The inert gas acts as a protective mediator that fills the void space created by the through hole, blocking harmful substances while maintaining the design flexibility of having a through hole in the display region.
Solution Approach 2:
The through hole is filled with an inert gas to create a protective inert atmosphere that prevents oxidation and moisture-related deterioration of the organic EL material. This inert environment maintains the reliability of the light-emitting layer while allowing the through hole structure to exist for design purposes.
2Device complexity
If a through hole passes through the substrate and sealing film, then structural simplicity is improved, but harmful factors such as moisture and oxygen can enter the light-emitting elements
Solution Approach 1:
The inert gas filling layer serves as a mediator that fills the through hole passage, preventing direct contact between the external environment (moisture and oxygen) and the light-emitting elements. This simple structural approach of filling the through hole with inert gas effectively blocks harmful factors without requiring complex sealing mechanisms.
Solution Approach 2:
By filling the through hole with inert gas, a protective inert atmosphere is created that extends from the sealing film through the hole to protect the light-emitting elements. This maintains the structural simplicity of the through hole design while effectively preventing harmful substances from reaching the sensitive organic EL material.
3Reliability
If the inorganic insulating layers are in direct contact in the moisture blocking region, then prevention of moisture and oxygen entry is improved, but the sealing film structure becomes more complex
Solution Approach 1:
The sealing film employs a composite structure combining multiple inorganic insulating layers (such as silicon oxide and silicon nitride) with different barrier properties. By stacking these materials with complementary characteristics, the sealing film achieves superior moisture and oxygen blocking performance. The direct contact between inorganic layers creates an effective barrier while the composite nature provides enhanced protection compared to single-layer structures.
Solution Approach 2:
The sealing film is segmented into multiple functional inorganic insulating layers, each providing specific barrier properties. This segmentation allows each layer to specialize in blocking different aspects of moisture and oxygen penetration, creating a multi-stage defense system that effectively prevents harmful substances from reaching the light-emitting elements.
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
The solution effectively prevents moisture and oxygen from entering the light-emitting elements, enhancing the reliability and design of the display device while maintaining the functionality of through holes in the display region.
Implementation Method 1
a sealing film including a second inorganic insulating material and covering the light emitting element... the second inorganic insulating material is in direct contact with the protective film in a first region located between the through hole and the pixels
Data Source
AI summary
A display device includes a substrate, a plurality of pixels above the substrate, each of the pixels including a light emitting element, a display region including the plurality of pixels, a thin film transistor which each of the plurality of pixels includes, a protective film including a first inorganic insulating material and located between the thin film transistor and the light emitting element, a sealing film including a second inorganic insulating material and covering the light emitting element, and at least one through hole located in the display region and passing through the substrate, the protective film, and the sealing film, wherein the second inorganic insulating material is in direct contact with the protective film in a first region located between the through hole and the pixels.