Micro Semiconductor Chip Side Light Guide Element
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Solution Overview
Problem
Micro LED displays face challenges in light extraction efficiency, which affects their performance and energy efficiency compared to OLED displays.
Innovation Solution
A micro semiconductor chip design incorporating a side light guide element with a connecting and extending portion, made of a thermal reflowable material with a refractive index greater than 1, is used to redirect light emitted from the side surface of the epitaxial layer towards the light extraction direction, improving light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional micro LED chip structure is used, then the device complexity is low, but the light extraction efficiency is insufficient
Solution Approach 1:
The patent introduces a side light guide element disposed on the side surface of the epitaxial layer, adding a vertical dimension component to light management. This side-view light extraction approach complements the traditional top-view extraction, creating a three-dimensional light extraction system that improves overall efficiency without fundamentally redesigning the planar chip structure
Solution Approach 2:
The side light guide element acts as an intermediary component between the epitaxial layer and the external environment. It receives light from the side surface of the epitaxial layer and redirects it toward the light extraction direction, serving as a mediating structure that converts otherwise lost side-emitted light into useful extraction light
2Ease of manufacture
If the side light guide element uses a material with refractive index greater than 1 and less than or equal to the epitaxial layer, then light extraction efficiency is improved, but material selection constraints increase
Solution Approach 1:
The patent specifies a refractive index range (greater than 1 and less than or equal to the epitaxial layer's refractive index) for the side light guide element material. This parameter constraint optimizes light extraction by ensuring proper refraction and total internal reflection conditions while still allowing multiple material choices within the defined range, such as various polymers or glass materials
3Ease of manufacture
If the extending portion forms an acute angle with the epitaxial layer top surface, then light focusing in the extraction direction is improved, but manufacturing precision requirements increase
Solution Approach 1:
The extending portion of the side light guide element is designed to form an acute angle θ1 with the top surface of the epitaxial layer. This angular geometry creates a wedge-like structure that naturally focuses and redirects light rays toward the light extraction direction, utilizing geometric optics principles to concentrate light without requiring additional optical components
Solution Approach 2:
The patent defines the acute angle θ1 as a specific geometric parameter that controls light redirection efficiency. By optimizing this angle parameter, the design achieves effective light focusing while maintaining manufacturability, as the angle can be controlled within reasonable tolerances during the molding or fabrication process
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 design enhances light extraction efficiency by focusing emitted light towards the desired direction, thereby improving the performance and energy efficiency of micro LED displays.
Implementation Method 1
The refractive index of the side light guide element is greater than 1, and the refractive index of the side light guide element is less than or equal to the refractive index of the epitaxial layer
Implementation Method 2
a plane containing the top surface of the epitaxial layer forms an acute angle θ1 with a plane containing the top surface of the extending portion
Data Source
AI summary
A micro semiconductor chip, a micro semiconductor structure, and a display device are provided. The micro semiconductor chip includes an epitaxial layer, a first electrode, a second electrode and a side light guide element. The epitaxial layer has a top surface, a bottom surface and a side surface. The first electrode and the second electrode are disposed on the bottom surface of the epitaxial layer. The side light guide element disposed on the side surface has a connecting portion and an extending portion. The connecting portion is in contact with a part of the extending portion, and the extending portion extends away from the side surface of the epitaxial layer. The extending portion has a top surface and a bottom surface, wherein a plane containing the top surface of the epitaxial layer forms an acute angle θ1 with a plane containing the top surface of the extending portion.