Distributed Bragg Reflector Display Structure for Broad-Band Light Recycling
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Solution Overview
Problem
Current display devices face challenges in achieving improved light output efficiency, particularly in effectively recycling and reflecting light across various wavelength bands to enhance color reproduction and overall brightness.
Innovation Solution
The implementation of an insulating reflective layer with a distributed Bragg reflector configuration, comprising multiple layers with different refractive indices, is used to reflect light in specific wavelength bands, and a low-refractive layer is added to optimize light recycling and output efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single-layer reflective structure is used, then the device complexity is reduced, but the light output efficiency across multiple wavelength bands is insufficient
Solution Approach 1:
The reflective layer is segmented into multiple distributed Bragg reflector layers, each designed to reflect specific wavelength bands. This segmentation allows the system to achieve broad-spectrum light reflection while maintaining a structured and manageable design approach.
Solution Approach 2:
The patent employs composite material structures with alternating high and low refractive index layers to create distributed Bragg reflectors. This composite approach enables enhanced light reflection efficiency across different wavelength bands by utilizing the optical properties of multiple materials working together.
2Productivity
If multiple distributed Bragg reflector layers are added to reflect different wavelength bands, then the light output efficiency is improved, but the device complexity increases
Solution Approach 1:
The reflective layer structure is designed with multi-functionality, where each distributed Bragg reflector layer serves multiple purposes: reflecting specific wavelength bands, managing optical pathways, and contributing to overall light extraction. This universal design reduces the need for separate dedicated components for each function.
3Productivity
If the reflective layer is optimized for specific wavelength bands, then the light output efficiency in those bands is improved, but the overall spectral coverage may be limited
Solution Approach 1:
Different regions of the reflective layer structure are assigned different optical properties through the use of distributed Bragg reflectors with varying refractive index ratios and thicknesses. This local quality optimization ensures that each layer is specifically tailored to reflect its target wavelength band while contributing to the overall spectral coverage of the device.
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 significantly enhances light output efficiency by effectively recycling light across a wide wavelength band, improving color reproduction and brightness, while preventing excessive dispersion of peak wavelengths.
Implementation Method 1
the first layer includes a first distributed Bragg reflector configured to reflect light in a first wavelength band, and the second layer includes a second distributed Bragg reflector configured to reflect light in a second wavelength band
Data Source
AI summary
A display device including: an insulating reflective layer on a substrate; and a light emitting element on the insulating reflective layer, wherein the insulating reflective layer includes a first layer and a second layer on the first layer, the first layer includes a first area of a shared layer that is at least a portion of the insulating reflective layer, the second layer includes a second area of the shared layer, the first layer includes a first distributed Bragg reflector configured to reflect light in a first wavelength band, and the second layer includes a second distributed Bragg reflector configured to reflect light in a second wavelength band.