Under-Cut Separation Around Display Substrate Holes for Moisture Blocking
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Solution Overview
Problem
In display apparatuses, external moisture permeating through substrate holes can damage light-emitting devices by reaching them through the light-emitting layer, leading to potential damage and operational issues.
Innovation Solution
A display apparatus design that includes a separating device with an under-cut structure between the substrate hole and the light-emitting device, where the depth and length of the under-cut structure are greater than the thickness of the light-emitting layer, effectively blocking moisture ingress. This separating device is integrated into the device's structure, using wide and narrow patterns made of insulating materials, and is formed during the process of creating the driving circuit and light-emitting device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a substrate hole is used to insert peripheral appliances, then the functionality of the display apparatus is improved, but external moisture can permeate through the substrate hole and damage the light-emitting devices
Solution Approach 1:
A separating device is introduced as an intermediary element between the substrate hole and the light-emitting device. This separating device includes an under-cut structure that blocks moisture migration paths while allowing the substrate hole to remain open for peripheral appliance insertion, thus protecting the light-emitting device without compromising functionality
Solution Approach 2:
The under-cut structure extends in the depth direction (z-axis) beyond the light-emitting layer thickness, creating a three-dimensional barrier. This vertical extension blocks moisture migration paths that would otherwise reach the light-emitting device through the substrate hole
2Reliability
If a separating device is added to block moisture, then the reliability of light-emitting devices is improved, but the device structure becomes more complex
Solution Approach 1:
The separating device is merged with the driving circuit structure. The under-cut structure is formed as part of the same fabrication process that creates the driving circuit patterns, combining multiple functions into a single integrated structure rather than adding a separate component
Solution Approach 2:
The separating device serves multiple functions: it acts as a moisture barrier, provides structural support, and integrates with the driving circuit layout. The under-cut structure simultaneously blocks moisture and defines the separation between different circuit regions
3Reliability
If the under-cut structure depth and length are made larger than light-emitting layer thickness, then moisture blocking effectiveness is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The under-cut structure dimensions (depth and length) are specifically designed to exceed the light-emitting layer thickness parameter. This parameter relationship ensures that moisture blocking effectiveness is achieved without requiring excessive precision, as long as the under-cut dimensions maintain this critical relationship
Data Source
AI summary
A display apparatus is provided. The display apparatus can include a substrate hole penetrating a device substrate, light-emitting devices spaced away from the substrate hole, and at least one separating device between the substrate hole and the light-emitting devices. Each of the light-emitting devices can include a light-emitting layer between a first electrode and a second electrode. The separating device can surround the substrate hole. The separating device can include at least one under-cut structure. The under-cut structure can include a depth and a length, which are larger than a thickness of the light-emitting layer. Thus, in the display apparatus, the damage of the light-emitting devices due to external moisture permeating through the substrate hole can be prevented.