Micro LED Surface Roughening to Reduce Light Interference
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Solution Overview
Problem
Conventional micro light emitting diodes in displays have small sizes and large light emitting angles, leading to interference between emitted lights that affect color performance and display quality.
Innovation Solution
A micro light emitting diode with a semiconductor unit featuring a roughened portion on its first surface, where the projection area is controlled to be less than or equal to the active layer, and a combination of insulation and protection layers to manage light emission and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the micro light emitting diode size is reduced, then the display resolution is improved, but the light emitting angle becomes larger causing light interference
Solution Approach 1:
The patent applies local quality by creating a roughened portion only in specific regions of the semiconductor unit surface, rather than uniformly across the entire surface. This localized roughening in the first and/or second regions modifies light emission characteristics in those specific areas, reducing light interference while maintaining overall device performance
Solution Approach 2:
The patent transitions from a two-dimensional planar surface to a three-dimensional roughened surface by forming protrusions and recesses on the semiconductor unit surface. This dimensional change creates varying light emission angles and paths, effectively reducing light interference between adjacent micro light emitting diodes
2Object-generated harmful factors
If the light emitting angle is reduced to minimize interference, then display quality is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent changes the surface morphology parameter of the semiconductor unit by forming a roughened portion with controlled protrusions and recesses. This parameter change in surface topology modifies the light emission pattern without requiring complex additional optical components or multi-step alignment processes
Solution Approach 2:
The patent divides the semiconductor unit surface into distinct regions (first region, second region, and optionally third region) with different roughening characteristics. This segmentation allows independent optimization of light emission in different areas, achieving reduced light interference through controlled regional variations rather than uniform complex structures
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
Enhances color performance and display quality by minimizing light interference between diodes, allowing for improved light emission directionality.
Implementation Method 1
The first surface has a roughened portion. The roughened portion has a projection that is projected on an imaginary plane along a projection direction perpendicular to the first surface
Data Source
AI summary
A micro light emitting diode includes a semiconductor unit having a first surface and a second surface, and including a first type semiconductor layer, an active layer, and a second type semiconductor layer. The first surface has a roughened portion that is located within a projection of the active layer. The projection of the roughened portion has a projected area not greater than that of the active layer. A micro light emitting device and a display are also disclosed.