Micro LED Contact Layer Layout for Pixel Crosstalk Reduction
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Solution Overview
Problem
Conventional micro LED structures exhibit poor electric current path performance due to the structure of the top contact layer, leading to inefficiencies in current distribution and crosstalk between pixels.
Innovation Solution
A specially shaped electrode metal layer with a continuous closed shape, such as circular, annular, or annular-square, is implemented as the top contact layer to constrain the electric current path and improve micro LED performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional top contact layer structure is used, then the manufacturing process is simple, but the electric current path performance is poor and crosstalk between pixels occurs
Solution Approach 1:
The top contact layer is segmented into pixel-level isolated contact regions rather than a continuous layer, with each region confined to its respective pixel area. This segmentation prevents current spreading between adjacent pixels, eliminating crosstalk while maintaining manufacturing feasibility through standard photolithography patterning processes.
Solution Approach 2:
The contact layer structure is optimized locally at each pixel level, where the contact material is positioned and shaped to match the underlying pixel geometry. This local optimization ensures current is confined to the intended pixel region, improving current path performance without requiring complex global structural changes.
2Reliability
If the top contact layer is designed to expand current between adjacent pixels, then current distribution may be improved, but crosstalk between pixels increases
Solution Approach 1:
The contact layer is divided into discrete, isolated contact regions for each pixel, preventing current from spreading to adjacent pixels. Each segmented contact region maintains uniform current distribution within its pixel while the isolation between segments eliminates crosstalk, simultaneously achieving both goals.
3Reliability
If a simple top contact layer structure is used, then manufacturing is easier, but current path constraint and pixel isolation are insufficient
Solution Approach 1:
The contact layer is patterned into discrete pixel-level regions using standard photolithography and etching processes. This segmentation approach achieves effective pixel isolation and current path constraint while remaining compatible with existing manufacturing techniques, balancing performance improvement with manufacturing ease.
Data Source
AI summary
An exemplary micro light-emitting diode (LED) structure includes an array of micro LEDs. Each micro LED in the array includes: a bottom epitaxial layer of a first conductive type; a light-emitting layer, formed on the bottom epitaxial layer; a top epitaxial layer of a second conductive type, formed on the light-emitting layer; and a top contact layer, formed on the top epitaxial layer and having a continuous closed shape.