Substrate Hole Separation Structure for Moisture-Resistant Displays
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Solution Overview
Problem
In display apparatuses, external moisture can permeate through substrate holes and damage light emitting elements, posing a challenge in preventing moisture ingress while maintaining a simplified process for blocking moisture.
Innovation Solution
A display apparatus design featuring a substrate with a penetrating area and a surrounding separating area, incorporating a separation structure with specific layered components that effectively block moisture ingress, including a first separation layer, a second separation layer, and a third separation layer, which are designed to isolate the light emitting elements from external moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a substrate hole is formed to insert peripheral appliances, then the functionality of the display apparatus is improved, but external moisture can permeate through the substrate hole and damage light emitting elements
Solution Approach 1:
The substrate is divided into a penetrating area containing the substrate hole and a separating area surrounding it. The separation structure is formed only in the separating area, segmenting the protection zone to block moisture migration paths while preserving the substrate hole for peripheral appliance insertion.
Solution Approach 2:
The separation structure is localized to the separating area adjacent to the substrate hole, providing moisture blocking functionality only where needed. This local quality approach prevents moisture damage without affecting the functionality of the substrate hole, maintaining both reliability and adaptability.
2Reliability
If a separation structure is formed to block moisture, then the reliability of light emitting elements is improved, but the process complexity increases
Solution Approach 1:
The separation structure merges multiple existing layer types (buffer layer, gate insulating film, gate electrode) into a single integrated structure. This combining approach provides effective moisture blocking without requiring additional separate layers, thus improving reliability while minimizing process complexity.
Solution Approach 2:
The separation structure serves multiple functions: it acts as a moisture barrier, provides structural support, and maintains electrical isolation. By making the separation structure multi-functional using existing layer types, the patent achieves improved reliability without increasing process complexity.
Data Source
AI summary
A display apparatus includes a substrate including a penetrating area including a substrate hole, and a separating area surrounding the penetrating area, a first buffer layer including a first-buffer lower layer on the substrate, and a first-buffer upper layer on the first-buffer lower layer, a first TFT including a first semiconductor pattern on the first-buffer upper layer, and a first gate electrode overlapping with the first semiconductor pattern under conditions that a first gate insulating film is interposed therebetween, and first source/drain electrodes connected to the first semiconductor pattern, a second TFT, a separation structure disposed in the separating area of the substrate while including a first separation layer having the same stacked structure as the first-buffer upper layer, a second separation layer having the same stacked structure as the first gate insulating film, and a third separation layer having the same stacked structure as the first gate electrode.