Organic EL Display Blocking Area for Moisture Ingress Prevention
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Solution Overview
Problem
Existing organic EL display devices are susceptible to moisture ingress due to insufficient sealing, particularly when foreign matter adheres to the vapor deposition mask during the formation of the sealing film, leading to potential display failures.
Innovation Solution
A light-emitting element display device with a blocking area comprising inorganic layers between the display and peripheral circuit areas, including a first blocking area made of inorganic material and a second blocking area with a light-emitting organic layer, to prevent moisture entry and ensure proper sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing film is formed on the TFT substrate to cover the display area and peripheral circuit area, then moisture protection is improved, but foreign matter adhesion to the vapor deposition mask during the deposition process creates entry routes that compromise sealing effectiveness
Solution Approach 1:
The patent divides the organic insulating layer into separate display area and peripheral circuit area portions, and introduces a blocking area between them. This segmentation prevents foreign matter transferred during deposition from creating continuous entry routes, as the blocking area interrupts the potential moisture path even if foreign matter is present in the peripheral circuit area
Solution Approach 2:
The patent applies different material properties to different regions: the blocking area uses inorganic material layers (such as silicon oxide or silicon nitride) that are impermeable to moisture, while the display area maintains the original organic insulating layer structure. This local differentiation ensures that even if foreign matter adheres in the peripheral area, the inorganic blocking area prevents moisture transmission to the display area
2Ease of manufacture
If the organic insulating layer is used throughout both display and peripheral circuit areas, then manufacturing simplicity is maintained, but moisture can enter the display area through the peripheral circuit area via the continuous organic layer
Solution Approach 1:
The patent segments the organic insulating layer into a display area organic insulating layer and a peripheral circuit area organic insulating layer, with a blocking area in between. This segmentation maintains manufacturing simplicity by using standard deposition processes while preventing moisture transmission through the peripheral circuit area to the display area
Solution Approach 2:
The blocking area acts as an intermediary barrier between the display area and peripheral circuit area. It is formed by inorganic material layers that are deposited using the same vapor deposition process, serving as a mediator that blocks moisture while maintaining process compatibility
Data Source
AI summary
A light-emitting element display device includes: a display area which has an organic insulating layer that is made of an organic insulating material; a peripheral circuit area which is disposed around the display area and which has the organic insulating layer; and a blocking area that is formed between the display area and the peripheral circuit area. The blocking area includes: a first blocking area configured by only one or a plurality of inorganic material layers between an insulating base substrate and an electrode layer which covers the display area and is formed continuously from the display area, and which configures one of two electrodes for allowing the light emitting area to emit the light; and a second blocking area including a plurality of layers configuring the first blocking area, and a light emitting organic layer.