Display Substrate Hole Separation Structure for Moisture Protection
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Solution Overview
Problem
External moisture permeates through substrate holes in display apparatuses, damaging light-emitting devices adjacent to the holes.
Innovation Solution
A display apparatus with a substrate hole featuring a separating device that includes under-cut structures with wide and narrow patterns, where the narrow patterns have a smaller width and are stacked with a conductive material, and a separation insulating layer to prevent moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a substrate hole is used to mount peripheral appliances, then the functionality and integration of the display apparatus is improved, but external moisture can permeate through the substrate hole and damage light-emitting devices
Solution Approach 1:
A separating device is introduced as an intermediary component between the substrate hole and the light-emitting device. This separating device includes a separating layer and an under-cut structure that physically blocks moisture pathways while allowing the substrate hole to remain open for peripheral appliance mounting, thus resolving the contradiction between functionality and moisture protection
Solution Approach 2:
The under-cut structure extends horizontally beneath the light-emitting device, creating a moisture-blocking barrier in the horizontal dimension rather than relying solely on vertical sealing. This dimensional approach blocks moisture lateral movement through the substrate hole while maintaining device functionality
2Reliability
If a separating device is added to block moisture, then protection of light-emitting devices is improved, but the device structure becomes more complex
Solution Approach 1:
The separating device is merged with the existing substrate hole structure and peripheral appliance mounting structure. The separating layer and under-cut structure are integrated into the existing device architecture rather than added as completely separate components, thus providing protection while minimizing structural complexity
Solution Approach 2:
The separating device is formed during the manufacturing process before final assembly, with the under-cut structure created as part of the substrate processing. This preliminary formation integrates the protective function into the existing manufacturing workflow without requiring additional complex assembly steps
Data Source
AI summary
A display apparatus can include a flexible substrate including a penetrating hole, a first thin film transistor including a first semiconductor layer, a second thin film transistor including a second semiconductor layer, and a first planarization layer on the first and second thin film transistors. The display apparatus can include a connection electrode on the first planarization layer electrically connected to the first or second thin film transistor, a second planarization layer on the first planarization layer, a first electrode on the second planarization layer electrically connected to the connection electrode, and a bank layer on the second planarization layer exposing a portion of the first electrode. The display apparatus includes a light-emitting layer on the portion of the first electrode exposed by the bank layer, the light-emitting layer including an emission material layer between first and second organic layers, and a second electrode on the light-emitting layer.