Micro LED Light Guide Structure for Transfer Stability
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Solution Overview
Problem
Current micro light-emitting diode transfer methods using holding structures often result in reduced light-emitting efficiency due to material characteristics that interfere with light guidance, as these structures are typically in contact with the light-emitting surface.
Innovation Solution
A micro light-emitting device design featuring a light guide structure with second grooves corresponding to first grooves on the epitaxial structure layer to enhance light-emitting efficiency, where the light guide structure covers a portion of the top surface and inner walls of the first grooves, improving light distribution and emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a holding structure is used to transfer micro light-emitting diodes, then the micro light-emitting diodes are stabilized and easier to transfer, but the holding structure material interferes with light guidance and reduces light-emitting efficiency
Solution Approach 1:
The holding structure is divided into two distinct parts: a holding portion that contacts the micro light-emitting diode for stable transfer, and a light guide portion that covers the light-emitting surface to improve light emission. This segmentation allows each part to perform its specific function without interference.
Solution Approach 2:
The light guide portion acts as an intermediary between the holding structure and the light-emitting diode, mediating the light output. It has a refractive index lower than the semiconductor layer, creating optimal light extraction conditions and improving light-emitting efficiency while the holding portion maintains transfer stability.
2Illumination intensity
If the light guide structure covers the entire top surface, then light distribution is maximized, but the complexity of manufacturing increases
Solution Approach 1:
The light guide structure is designed with varying coverage: it covers the entire light-emitting surface in the central region for optimal light distribution, while having reduced or no coverage in peripheral regions. This local quality approach maximizes light emission where needed while simplifying manufacturing in less critical areas.
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
This design effectively increases light-emitting efficiency and display quality by optimizing the light guide structure's geometry and coverage, ensuring better light emission and reduced interference from holding structures.
Implementation Method 1
The light guide structure has a smaller refractive index than that of the first-type semiconductor layer. The light guide structure covers a portion of the top surface and a portion of inner walls of the first grooves
Data Source
AI summary
A micro light-emitting device includes an epitaxial structure layer, a first-type electrode, a second-type electrode, and a light guide structure. The epitaxial structure layer has a top surface and a bottom surface opposite to each other and a plurality of first grooves located on the top surface. The first-type electrode and the second-type electrode separated from each other are disposed on the epitaxial structure layer and located at the bottom surface. The light guide structure is disposed on the epitaxial structure layer. The light guide structure covers a portion of the top surface and a portion of inner walls of the first grooves to define a plurality of second grooves corresponding to the portion of the first grooves.