OLED Peripheral Area Inorganic Insulating Layer Moisture Barrier
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Solution Overview
Problem
In organic electroluminescent display devices, the planarization film acts as a moisture permeation path, degrading the organic layer, and forming grooves to block moisture increases the peripheral area width, limiting the device's miniaturization.
Innovation Solution
An organic electroluminescent display device with a peripheral area covered by an inorganic insulating layer instead of the planarization film, preventing moisture ingress while maintaining electrical insulation, allowing for a narrower peripheral area without the need for moisture-blocking grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a groove is formed in the planarization film to block moisture permeation, then moisture blocking is improved, but the peripheral area width increases
Solution Approach 1:
The planarization film is segmented into display area and peripheral area portions, with the peripheral area portion removed to eliminate moisture permeation paths while avoiding the need for groove structures that would increase peripheral width
Solution Approach 2:
The peripheral area portion of the planarization film is extracted and removed entirely, replacing it with an inorganic insulating layer that provides both electrical insulation and moisture blocking functions without requiring additional groove structures
2Ease of manufacture
If the planarization film is formed of organic material, then ease of manufacture is improved, but moisture permeation increases
Solution Approach 1:
Different regions of the device use different materials: the display area retains the organic planarization film for ease of manufacture, while the peripheral area uses an inorganic insulating layer to provide moisture blocking, creating local quality differentiation
Solution Approach 2:
The device structure combines organic planarization film material in the display area with inorganic insulating layer material in the peripheral area, creating a composite structure that leverages the advantages of both material types
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 configuration effectively suppresses moisture permeation into the display area, enabling a reduction in the peripheral area width without compromising the electrical insulation of circuit elements, thus enhancing the device's compactness and reliability.
Implementation Method 1
an inorganic insulating layer formed of an inorganic material, the inorganic insulating layer being formed in the peripheral area and covering the at least a portion of the circuit in the peripheral area
Data Source
AI summary
An organic electroluminescent display device includes a display area including a plurality of pixels, a peripheral area as an area on the outside of the display area, a circuit layer including a circuit formed in the display area and a circuit formed in the peripheral area, a planarization film formed in the display area, the planarization film covering the circuit in the display area but not covering at least a portion of the circuit in the peripheral area, and an inorganic insulating layer formed of an inorganic material, the inorganic insulating layer being formed in the peripheral area and covering the at least a portion of the circuit in the peripheral area.