Light-Emitting Element With Insulating Layer For Light Direction Control
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Solution Overview
Problem
Light-emitting diodes (LEDs) face challenges in achieving uniform light distribution, color consistency, and light intensity across different applications due to variations in light direction and absorption rates, which affect their reliability and efficiency.
Innovation Solution
A light-emitting element design incorporating a light-emitting unit, a wavelength conversion layer, and an insulating layer, where the wavelength conversion layer includes a phosphor and a stress release layer, and the insulating layer surrounds the side surfaces of the wavelength conversion layer to manage light absorption and distribution effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a light-emitting diode is used to replace traditional light sources, then power consumption is reduced and operational life is extended, but uniform light distribution and color consistency across different applications become difficult to achieve
Solution Approach 1:
The patent applies local quality by creating distinct regions within the wavelength conversion layer: a first region with phosphor particles that converts light to a first wavelength, and a second region without phosphor particles that allows light to pass through or reflect. This spatial differentiation of material properties enables different optical functions in different locations, achieving both uniform light distribution and color consistency while maintaining the energy efficiency of LED technology.
2Illumination intensity
If the wavelength conversion layer contains phosphor particles, then light wavelength conversion is achieved, but light absorption becomes non-uniform affecting light extraction efficiency
Solution Approach 1:
The patent segments the wavelength conversion layer into multiple functional regions: a first region containing phosphor particles for wavelength conversion, and a second region without phosphor particles for light transmission or reflection. This segmentation allows different portions of the layer to perform different optical functions, reducing non-uniform light absorption and improving overall light extraction efficiency while maintaining effective wavelength conversion in the phosphor-containing region.
3Ease of operation
If the insulating layer has high absorption rate to the first light, then light direction control is improved, but light intensity is reduced
Solution Approach 1:
The patent introduces an insulating layer as an intermediary component with specific optical properties: it has a first absorption rate to the first light (for direction control) and a second absorption rate to the second light (for intensity maintenance). This intermediary layer mediates between the light-emitting diode and the external environment, enabling directional control of converted light while preserving overall light intensity through selective wavelength-dependent absorption.
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 design enhances light extraction efficiency, improves color uniformity, and increases the reliability of the light-emitting element by optimizing light absorption and distribution, addressing the issues of non-uniform light emission and directionality.
Implementation Method 1
a wavelength conversion layer configured to emit a second light with a second peak wavelength greater than the first peak wavelength
Implementation Method 2
The insulating layer has a first absorption rate to the first light, and a second absorption rate to the second light. The first absorption rate is greater than second absorption rate.
Data Source
AI summary
A light-emitting element having a light-emitting unit, a transparent layer and a wavelength conversion layer formed on the transparent layer. The transparent layer covers the light-emitting unit. The wavelength conversion layer includes a phosphor layer having a phosphor and a stress release layer without the phosphor.