Display Sealing Film Segmentation for Cut-Region Moisture Barrier
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Solution Overview
Problem
The sealing capability of organic EL display devices is compromised when a cut is made inside the display region to accommodate components like cameras and fingerprint sensors, as it weakens the sealing film's protective barrier against moisture and oxygen.
Innovation Solution
A display device configuration that includes a base substrate with a light-emitting element, a sealing film with a stack of inorganic insulating films, a cut in the frame region, a cut-peripheral wall, and an organic buffer layer between the inorganic films to enhance sealing, ensuring the sealing film's integrity even with a cut inside the display region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a cut is made inside the display region to accommodate components like cameras and fingerprint sensors, then the adaptability of the display device is improved, but the sealing capability of the sealing film deteriorates
Solution Approach 1:
The sealing film is divided into multiple segments: a first sealing film portion covering the display region, a second sealing film portion covering the frame region, and a third sealing film portion bridging between them. This segmentation allows the sealing structure to adapt to the cut while maintaining continuous sealing coverage across different regions.
Solution Approach 2:
The sealing film extends into the depth dimension by forming a protrusion that reaches into the cut. This three-dimensional configuration allows the sealing film to bridge across the cut opening, maintaining sealing capability while accommodating the cut for component placement.
2Adaptability or versatility
If a cut is made inside the display region, then the adaptability for component placement is improved, but the integrity and protective barrier function of the sealing film deteriorates
Solution Approach 1:
The sealing film is segmented into multiple functional portions (first, second, and third sealing film portions) that collectively maintain integrity around the cut. Each portion serves a specific sealing function, and their combination preserves the overall protective barrier despite the cut.
Solution Approach 2:
The sealing film utilizes the depth dimension by forming a protrusion that extends into the cut region. This vertical extension allows the sealing film to maintain continuity and integrity by bridging across the cut in three-dimensional space rather than being limited to a flat two-dimensional plane.
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 significantly enhances the sealing capability of the display device, preventing moisture and oxygen ingress even when a cut is present, thus maintaining the integrity of the organic EL element.
Implementation Method 1
an evaporated film disposed between the cut-peripheral wall and the first inorganic insulating film
Implementation Method 2
an organic buffer layer disposed on a surface of the cut-peripheral wall and interposed between the first and second inorganic insulating films
Data Source
AI summary
A display device includes the following: a base substrate; a light-emitting element on the base substrate with a TFT layer interposed therebetween, the light-emitting element forming a display region; a sealing film covering the light-emitting element and having a stack of, in sequence, first and second inorganic insulating films; a frame region surrounding the display region; a cut disposed in the frame region so as to partly cut the display region; a cut-peripheral wall disposed in the frame region between the display region and the cut, and extending along the boundary of the display region; an evaporated film between the cut-peripheral wall and the first inorganic insulating film; and an organic buffer layer disposed on a surface of the cut-peripheral wall and interposed between the first and second inorganic insulating films.