Micro-LED Display Hole Structure With Reflective Light Collection
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Solution Overview
Problem
Conventional display devices using micro-LEDs suffer from light loss at the rear and side surfaces of the panel, which deteriorates image quality due to inefficient light collection.
Innovation Solution
A display device with a semiconductor light emitting diode is designed to efficiently collect light emitted from the diode to the front surface of the panel, featuring a substrate, a semiconductor light emitting diode, a planarization layer with a hole for the diode, a light-transmitting layer filling the hole, and a reflective layer along the inner surfaces of the hole, which expands in width as it moves away from the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional micro-LED structure with transparent layer surrounding the emitting light is used, then the device structure is simple, but light loss occurs at the rear and side surfaces of the panel which deteriorates image quality
Solution Approach 1:
The device is segmented into distinct functional layers: a planarization layer with a hole for the micro-LED, a light-transmitting layer filling the hole, and a reflective layer formed along the inner surfaces of the hole. This segmentation allows each layer to perform its specific function optimally - the planarization layer provides structural support and defines the hole geometry, the light-transmitting layer allows light passage, and the reflective layer captures and redirects light that would otherwise be lost at the rear and side surfaces.
Solution Approach 2:
The reflective layer converts the harmful light loss at the rear and side surfaces into a beneficial effect by reflecting this light back toward the front surface of the panel. The hole structure with expanding width captures light that would otherwise be wasted, and the reflective layer transforms this potentially harmful light loss into useful light output, improving overall device efficiency and image quality.
2Loss of energy
If the hole width expands as distance from substrate increases, then light collection efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The planarization layer exhibits local quality variation through its inclined structure, where the thickness and hole width change gradually from the substrate side to the top side. This local variation in geometry creates the expanding hole width that improves light collection efficiency while maintaining manufacturability through controlled deposition or etching processes that can produce gradual thickness changes.
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 described structure enhances light collection efficiency by reflecting light that would otherwise be lost and directing it towards the front surface, thereby improving image quality.
Implementation Method 1
a reflective layer formed along at least one surface of the substrate and the planarization layer defining an inner surface of the hole
Data Source
AI summary
Discussed is a display device using a semiconductor light emitting diode disposed on a substrate, a planarization layer stacked on the substrate while defining a hole that is a region in which the semiconductor light emitting diode is disposed, a light-transmitting layer filling the hole, and a reflective layer formed along at least one surface of the substrate and the planarization layer defining an inner surface of the hole, wherein the hole is formed so that a width thereof expands as a distance from the substrate increases.