Display Encapsulation Film Structure for Moisture Crack Protection
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Solution Overview
Problem
Display devices using organic electroluminescent or quantum dot luminescent materials are vulnerable to external environments such as oxygen and moisture, and foreign substances can introduce cracks, exposing the luminescent materials, necessitating improved encapsulation techniques.
Innovation Solution
A display device with a single-layered encapsulation-inorganic film structure that covers the light emitting element, incorporating a metal layer and sacrificial layer to enhance protection, and a method for manufacturing this structure using chemical vapor deposition or atomic layer deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layered encapsulation-inorganic film is used to protect the light emitting element, then manufacturing complexity is reduced, but protection reliability against moisture and oxygen penetration may be insufficient
Solution Approach 1:
The encapsulation-inorganic film is formed as a composite structure comprising multiple functional layers: a barrier layer (silicon nitride or silicon oxynitride) for moisture and oxygen blocking, and a stress control layer (silicon oxide) to prevent cracking. This composite material approach achieves both simplified single-layered structure and high protection reliability by combining materials with complementary properties.
2Productivity
If foreign substances are introduced during manufacturing, then production efficiency is maintained, but crack formation occurs exposing luminescent materials to external environments
Solution Approach 1:
The encapsulation-inorganic film is formed over the entire light emitting element structure before final assembly and testing. This preliminary encapsulation action prevents foreign substances from reaching and causing cracks in the luminescent materials during subsequent manufacturing steps, while the single-layered design maintains manufacturing efficiency.
3Reliability
If multiple encapsulation layers are used to prevent moisture penetration, then protection performance is improved, but manufacturing process complexity increases
Solution Approach 1:
Instead of using multiple separate encapsulation layers, the invention employs a composite inorganic film structure with distinct functional layers (barrier layer and stress control layer) formed in a single encapsulation process. This achieves high moisture barrier performance while avoiding the complexity of multiple sequential encapsulation steps.
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 encapsulation-inorganic film provides enhanced reliability by preventing moisture and foreign substance penetration, thereby improving the durability and performance of the display device.
Implementation Method 1
an encapsulation-inorganic film which covers the light emitting element
Implementation Method 2
a method for manufacturing the display device including a method for forming an inorganic film that covers a light emitting element
Implementation Method 3
a method for manufacturing the display device including a method for forming an inorganic film that covers a light emitting element
Data Source
AI summary
A display device includes: a base layer; a circuit layer on the base layer; a light emitting element including a first electrode on the circuit layer, a functional layer on the first electrode, and a second electrode on the functional layer; a pixel defining film on the circuit layer and having a first pixel opening; a first auxiliary pixel defining film which includes a metal substance and is between the pixel defining film and the circuit layer and having a second pixel opening; and a second auxiliary pixel defining film between the circuit layer and the first auxiliary pixel defining film and having a third pixel opening, which exposes one surface of the first electrode, wherein the second electrode is in contact with the first auxiliary pixel defining film.