Micro LED Metal-Particle Contact Layout for Lower Shading
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Solution Overview
Problem
Conventional micro LED displays suffer from issues with displaying quality due to the arrangement of metal contacts on the top surface of a micro LED which deteriorate the displaying quality of the micro LED displays.
Innovation Solution
A micro LED element includes a first semiconductor layer, a light emitting layer, and a second semiconductor layer stacked from top down to form a mesa with a sidewall of the mesa. The mesa is inclined and a transparent conductive layer is formed on a top surface of the first semiconductor layer. The mesa includes a metal contact comprising a plurality of metal particles conductively coupled to the top surface of the first semiconductor layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal contact is arranged on the top surface of a micro LED to increase electrical conductivity, then the electrical conductivity is improved, but the displaying quality deteriorates due to shading effect
Solution Approach 1:
The metal contact is segmented into multiple discrete metal particles rather than a continuous metal layer. This segmentation reduces the total coverage area of the metal contact on the light emitting surface, thereby reducing the shading effect while maintaining adequate electrical conductivity through the distributed particles.
Solution Approach 2:
The metal particles are selectively positioned in specific regions of the transparent conductive layer, concentrating electrical conductivity where needed while leaving other regions transparent for light emission. This local quality approach optimizes the balance between electrical function and optical performance.
2Illumination intensity
If a transparent conductive layer is formed on the top surface of the first semiconductor layer, then the light extraction efficiency is improved, but the electrical conductivity between the metal contact and semiconductor layer deteriorates
Solution Approach 1:
Metal particles are introduced as intermediary elements within the transparent conductive layer to bridge the electrical connection between the first semiconductor layer and the external circuit. These particles provide conductive pathways through the transparent layer without compromising its optical transparency, thus mediating between the conflicting requirements of electrical conductivity and light extraction.
Solution Approach 2:
The transparent conductive layer is formulated as a composite material containing both transparent conductive matrix and metal particles. This composite structure combines the optical transparency of the matrix with the high electrical conductivity of the metal particles, achieving simultaneous improvement in both light extraction efficiency and electrical conductivity.
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 micro LED element enhances the electrical conductivity between the first semiconductor layer and the transparent conductive layer, reducing the shading effect, thus improving the displaying quality of the micro LED displays.
Implementation Method 1
a metal contact comprising a plurality of metal particles conductively coupled to the top surface of the first semiconductor layer
Implementation Method 2
a first semiconductor layer, a light emitting layer, and a second semiconductor layer stacked from top down
Data Source
AI summary
A micro LED element, a micro LED display panel, and a display device are provided. The micro LED element includes: a first semiconductor layer, a light emitting layer, and a second semiconductor layer stacked from top down; and a metal contact including a plurality of metal particles conductively coupled to the top surface of the first semiconductor layer.