LED Bragg Reflector With Inclined Insulation Patterns
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing light emitting diodes (LEDs) face limitations in light emission efficiency due to the dispersion of light in multiple directions, leading to reduced brightness and efficiency, as conventional Bragg reflector structures do not effectively guide light towards a predetermined emitting direction.
Innovation Solution
The LED design incorporates a Bragg reflector structure with a conductive layer and insulation patterns, where the insulation patterns have inclined surfaces to facilitate better coverage and reflectance, enhancing light extraction efficiency by directing light towards a specific emitting direction with a reflectance of at least 95% in a specific wavelength range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional Bragg reflector structure is used, then light reflection is achieved, but light disperses in multiple directions reducing emission efficiency
Solution Approach 1:
The Bragg reflector structure employs asymmetric inclined surfaces instead of symmetric vertical surfaces. The inclined surfaces are designed with specific angles (first inclined surface with first angle, second inclined surface with second angle) to asymmetrically redirect light paths, concentrating reflected light into a predetermined emission direction rather than allowing uniform dispersion in multiple directions.
Solution Approach 2:
Different regions of the Bragg reflector structure are designed with different local properties. The first and second inclined surfaces have different inclination angles tailored to specific functional requirements, allowing localized optimization of light reflection angles to achieve both high reflection efficiency and directional light emission in different areas of the structure.
2Productivity
If the Bragg reflector structure is added to improve light extraction, then light emission efficiency increases, but device complexity increases
Solution Approach 1:
The Bragg reflector structure is integrated directly into the semiconductor layers of the LED device, merging the reflection function with the existing light-emitting structure. The conductive layer is combined with the Bragg reflector structure, and insulation patterns are integrated within the same structural framework, reducing the need for separate components and simplifying manufacturing.
Solution Approach 2:
The Bragg reflector structure serves multiple functions simultaneously: it reflects light to improve extraction efficiency, directs light toward a predetermined emission direction through inclined surfaces, and the conductive layer provides both electrical conduction and structural support. This multi-functionality reduces the need for additional separate components.
3Illumination intensity
If insulation patterns with inclined surfaces are used, then light directionality improves, but manufacturing precision requirements increase
Solution Approach 1:
The design specifies parameter ranges for the inclined surfaces (first angle and second angle within certain ranges) rather than requiring exact precise values. This allows manufacturing within acceptable tolerances while still achieving the desired light directionality effect, reducing the stringency of precision requirements.
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 improves light emission efficiency by effectively reflecting and directing light, resulting in enhanced brightness and uniformity, making the LED suitable for various lighting applications.
Implementation Method 1
one side of the LED has a distributed Bragg reflector (DBR) structure formed thereon, so as to reflect parts of light emitted from the emitting layer of the LED toward a predetermined emitting direction
Implementation Method 2
Each insulating layer has a first surface facing toward the second-type semiconductor layer, a second surface facing away from the second-type semiconductor layer, and an inclined surface. The inclined surface connects the first surface and the second surface and is inclined with respect to the first surface and the second surface.
Data Source
AI summary
The invention provides an LED including a first-type semiconductor layer, an emitting layer, a second-type semiconductor layer, a first electrode, a second electrode, a Bragg reflector structure, a conductive layer and insulation patterns. The first electrode and the second electrode are located on the same side of the Bragg reflector structure. The conductive layer is disposed between the Bragg reflector structure and the second-type semiconductor layer. The insulation patterns are disposed between the conductive layer and the second-type semiconductor layer. Each insulating layer has a first surface facing toward the second-type semiconductor layer, a second surface facing away from the second-type semiconductor layer, and an inclined surface. The inclined surface connects the first surface and the second surface and is inclined with respect to the first surface and the second surface.