Distributed Bragg Reflector Insulating Layers for Display Alignment
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Solution Overview
Problem
Current display devices face challenges in improving the alignment degree and light emission efficiency of light emitting elements, particularly due to suboptimal reflective layer configurations and material choices.
Innovation Solution
The proposed solution involves a display device structure with a distributed Bragg reflector-based insulating reflective layer configuration, including a first and second insulating reflective layer with specific layer pairs and materials like silicon oxide and silicon nitride, positioned above a substrate and electrodes, to enhance light emission efficiency and alignment precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional reflective layer configuration is used, then the device structure is simple, but the alignment degree and light emission efficiency are insufficient
Solution Approach 1:
The reflective layer is segmented into multiple distributed Bragg reflector layers (first DBR layer, second DBR layer, third DBR layer) with different refractive indices and thicknesses. Each layer pair consists of high-refractive-index materials (e.g., TiO2, Ta2O5) and low-refractive-index materials (e.g., SiO2, Nb2O5), creating a stratified structure that improves light reflection efficiency and alignment degree through controlled optical interference.
Solution Approach 2:
The patent employs composite material structures in the reflective layers, combining multiple dielectric materials with different optical properties (refractive indices ranging from 1.45 to 2.35). The first DBR layer uses TiO2/SiO2 pairs, the second DBR layer uses Ta2O5/SiO2 pairs, and the third DBR layer uses TiO2/SiO2 pairs again, creating a composite multilayer system that optimizes both alignment precision and light emission efficiency.
2Loss of energy
If the number of DBR layer pairs is increased to improve reflection efficiency, then light emission efficiency improves, but manufacturing complexity and time increase
Solution Approach 1:
The patent implements a balanced DBR structure with 3-5 layer pairs per DBR unit, providing sufficient reflection efficiency (R>90%) without excessive complexity. The first DBR layer has 3-5 pairs, the second DBR layer has 3-5 pairs, and the third DBR layer has 2-4 pairs, achieving optimal light emission efficiency while controlling manufacturing time and process complexity within industrial feasibility limits.
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
This configuration improves the alignment degree and light emission efficiency of the display device by optimizing the reflective layer structure and material selection, ensuring effective light reflection and emission while maintaining electric field intensity.
Implementation Method 1
a first insulating reflective layer including a distributed Bragg reflector above a substrate, a first electrode and a second electrode above the first insulating reflective layer, a second insulating reflective layer including a distributed Bragg reflector above the first electrode and the second electrode
Implementation Method 2
The first insulating reflective layer may include alternately located (1_1)th and (1_2)th layers, respective ones of the (1_1)th and the (1_2)th layers forming first pairs, wherein the second insulating reflective layer includes alternately located (2_1)th and (2_2)th layers, respective ones of the (2_1)th and the (2_2)th layers forming second pairs
Data Source
AI summary
A display device may include including a first insulating reflective layer including a distributed Bragg reflector above a substrate, a first electrode and a second electrode above the first insulating reflective layer, a second insulating reflective layer including a distributed Bragg reflector above the first electrode and the second electrode, and a light emitting element above the second insulating reflective layer.