Breathable Micro LED Display with Substrate Air Passages
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Solution Overview
Problem
Wearable electronic devices with displays face challenges in providing a comfortable user experience due to the lack of breathability, which affects the overall user satisfaction and device performance.
Innovation Solution
A micro light emitting diode display is designed with a substrate having air passages and an electrode layer, allowing air to flow through, making it breathable and suitable for wearable devices by incorporating micro light emitting diode devices with a light emitting area of less than or equal to 2500 μm2, and using either through holes or porous materials to facilitate airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional display structure is used in wearable devices, then the display functionality is achieved, but the breathability and wearing comfort are compromised
Solution Approach 1:
The substrate is designed with a porous structure containing multiple air passages that extend from the first surface to the second surface. This porous configuration enables air to flow through the substrate, providing breathability while maintaining the structural integrity needed to support the display components and electrical connections.
Solution Approach 2:
The substrate is segmented to include multiple discrete air passages distributed throughout its structure. This segmentation allows air flow paths to be created without compromising the overall structural strength, as the passages are strategically positioned to avoid critical load-bearing areas while still providing effective breathability.
2Object-affected harmful factors
If air passages are added to the substrate, then breathability is improved, but the structural strength may be compromised
Solution Approach 1:
The substrate exhibits local quality variations where different regions have different properties. Areas requiring high strength maintain solid substrate structure, while specific regions incorporate air passages to provide breathability. The electrode layer is positioned to bridge across air passage openings, ensuring electrical continuity is maintained locally even where the substrate is porous.
Solution Approach 2:
The display structure employs a composite configuration combining the porous substrate material with additional structural elements. The electrode layer acts as a reinforcing element that spans across air passage openings, creating a composite structure that maintains both breathability through the substrate and structural strength through the combined system of substrate plus electrode layer.
3Reliability
If the electrode layer covers the entire substrate surface, then electrical coverage is maximized, but air flow is blocked
Solution Approach 1:
The electrode layer is extracted from being a continuous covering and is instead positioned only in specific locations. The electrode layer is disposed on and in contact with the first surface of the substrate but is intentionally spaced apart from the openings of the air passages. This extraction allows air to flow freely through the air passage openings while the electrode layer maintains electrical connections in the regions where it is positioned.
Solution Approach 2:
The design transitions from a two-dimensional continuous electrode layer to a more complex three-dimensional arrangement where the electrode layer exists in specific zones above the substrate surface. The electrode layer is positioned to make contact with the substrate at certain points while leaving openings exposed, creating a spatial arrangement that satisfies both electrical coverage requirements and air flow needs through strategic positioning in three-dimensional space.
Data Source
AI summary
A micro light emitting diode display includes a substrate, an electrode layer and a micro light emitting diode device. The substrate has a first surface, a second surface opposite to the first surface, and at least one air passage extending from the first surface to the second surface. The electrode layer is disposed on and in contact with the first surface of the substrate. The air passage has an opening on the first surface of the substrate, and the electrode layer is spaced apart from the opening. The micro light emitting diode device is disposed on the electrode layer and has a light emitting area that is less than or equal to 2500 μm2.