MicroLED Cover Plate Bonding With Black Matrix Reflection Shielding
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Solution Overview
Problem
Current light emitting devices, such as microLED arrays in displays, face challenges in achieving optimal optical bonding and light management due to reflections and mechanical protection, particularly in the integration of optical bonding layers and black matrix structures.
Innovation Solution
A light emitting device structure comprising a backplane with an array of microLEDs, a transparent conductive layer, an optical bonding layer, a transparent cover plate, and a black matrix layer with openings, where the optical bonding layer is injected between the transparent conductive layer and the cover plate, and the black matrix layer is strategically positioned to reduce reflections and enhance mechanical protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an optical bonding layer is introduced to improve optical clarity, then reflections are reduced, but the device structure becomes more complex
Solution Approach 1:
An optical bonding layer is introduced as an intermediary component between the microLED array and the transparent cover plate. This bonding layer serves as a mediator that reduces optical reflections at the interface while mechanically joining the two components, thereby improving optical clarity without proportionally increasing structural complexity.
Solution Approach 2:
The optical bonding layer is formed using a transparent dielectric material that combines optical properties (low reflection) with mechanical bonding properties. This composite approach allows a single material to fulfill multiple functions: optical optimization and structural adhesion, thus improving clarity while limiting complexity increase.
2Illumination intensity
If a black matrix layer is added to reduce reflections and enhance protection, then optical performance improves, but manufacturing complexity increases
Solution Approach 1:
The black matrix layer is applied selectively in specific regions where reflections need to be reduced, rather than uniformly across the entire device. This localized application targets problem areas (interfaces prone to reflection) while leaving other areas unchanged, thus improving optical performance without requiring complete remanufacturing of the entire structure.
Solution Approach 2:
The black matrix layer is deposited on the transparent cover plate before final assembly with the microLED array. This preliminary action allows the reflective properties to be established in advance, simplifying the final assembly process and reducing manufacturing complexity compared to applying the black matrix after assembly.
3Strength
If the transparent cover plate is spaced from the transparent conductive layer, then mechanical protection is provided, but optical bonding efficiency decreases
Solution Approach 1:
The optical bonding layer serves as an intermediary substance that fills the gap between the transparent cover plate and the transparent conductive layer. This mediator maintains the mechanical spacing required for protection while simultaneously providing optical coupling that ensures bonding efficiency, thus resolving the contradiction between physical separation and optical connection.
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
The solution improves optical clarity by minimizing reflections and provides mechanical protection against ambient factors like dust and moisture, while ensuring the microLEDs are shielded from mechanical damage, thereby enhancing the overall performance and durability of the light emitting device.
Implementation Method 1
Current light emitting devices, such as microLED arrays in displays, face challenges in achieving optimal optical bonding and light management due to reflections
Implementation Method 2
a black matrix layer including an array of openings therethrough, and located between the optical bonding layer and the transparent cover plate
Data Source
AI summary
A light emitting device includes a backplane, an array of light emitting diodes attached to a front side of the backplane, a transparent conductive layer contacting front side surfaces of the light emitting diodes, an optical bonding layer located over a front side surface of the transparent conductive layer, a transparent cover plate located over a front side surface of the optical bonding layer, and a black matrix layer including an array of openings therethrough, and located between the optical bonding layer and the transparent cover plate.