Semiconductor Barrier Layer Doping for Efficient Micro-LED Displays
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Solution Overview
Problem
Current display devices, particularly in head-mounted displays for VR/AR, face challenges in maintaining high light emission efficiency due to lattice constant differences between light emitting elements and barrier layers, which can lead to decreased performance and efficiency.
Innovation Solution
A display device design featuring a substrate with pixel electrodes, light emitting elements, and a barrier layer made of semiconductor material like AlGaInN, GaN, or InN, doped with iron or carbon, which is grown from a second semiconductor layer to prevent lattice constant differences and enhance light emission efficiency by acting as an insulator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a barrier layer is introduced to partition light emitting elements, then light emission efficiency is improved, but lattice constant differences cause performance degradation
Solution Approach 1:
The patent changes the material parameters of the barrier layer by doping semiconductor materials (AlGaInN, GaN, or InN) with iron or carbon at concentrations of 1×10^17 to 1×10^20/cm³. This parameter modification transforms the barrier layer into an insulating material that prevents carrier leakage while maintaining lattice compatibility, thereby improving light emission efficiency without performance degradation from lattice mismatch.
Solution Approach 2:
The patent creates a composite material structure by combining semiconductor materials with iron or carbon dopants. This composite approach gives the barrier layer dual characteristics: structural compatibility with the light emitting elements (from the semiconductor base material) and insulating properties (from the iron or carbon doping), thus resolving the contradiction between partitioning effectiveness and performance stability.
2Productivity
If a barrier layer is used to partition emission areas, then device performance is improved, but the barrier layer may damage light emitting elements
Solution Approach 1:
By changing the electrical parameters through iron or carbon doping, the barrier layer becomes insulating and electrically inactive toward the light emitting elements. This parameter modification allows the barrier layer to provide electrical partitioning and performance improvement without causing damage through carrier injection or electrical stress.
Solution Approach 2:
The barrier layer acts as an intermediary structure between adjacent light emitting elements. The iron or carbon doping creates an insulating medium that provides necessary electrical isolation and partitioning while being chemically and structurally compatible with the light emitting elements, thus improving device performance without causing damage.
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 solution effectively prevents a decrease in light emission efficiency and allows for partitioning of emission areas without damaging the light emitting elements, improving overall device performance by using a dopant like iron or carbon to form an insulating barrier layer.
Implementation Method 1
the barrier layer includes a semiconductor material and a dopant including iron or carbon
Implementation Method 2
acting as an insulator
Data Source
AI summary
A display device includes a substrate, a plurality of pixel electrodes on the substrate, a plurality of light emitting elements on the plurality of pixel electrodes, and each of the plurality of light emitting elements including a first semiconductor layer, an active layer, and a second semiconductor layer, and a barrier layer around the plurality of light emitting elements and partitioning the plurality of light emitting elements, wherein the barrier layer includes a semiconductor material and a dopant including iron or carbon.