Quantum Dot Light Conversion Structure for Low-Leakage Micro LEDs
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Solution Overview
Problem
Current light-emitting devices face challenges in achieving high light conversion efficiency without the use of scattering particles, which complicates the manufacturing process and can lead to light leakage, especially when trying to convert the wavelength of light emitted by micro LEDs with blue light using quantum dot photoluminescent materials.
Innovation Solution
The light-emitting device incorporates a light conversion layer with specific material layers and geometrical configurations, including a first material layer for incident light, a second material layer for reflection, and a third material layer with an inclined surface, ensuring that light is refracted and reflected within the light conversion layer to enhance light conversion efficiency without the need for scattering particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If scattering particles are added to the light conversion layer to improve light conversion efficiency, then light conversion efficiency is improved, but manufacturing complexity increases and light leakage occurs
Solution Approach 1:
The patent removes scattering particles from the light conversion layer, extracting the harmful element that caused manufacturing complexity and light leakage while maintaining light conversion efficiency through alternative structural designs
Solution Approach 2:
The patent introduces asymmetric geometric structures including inclined surfaces, stepped configurations, and non-uniform layer thicknesses in the light conversion layer and surrounding material layers, creating optical path differences that enhance light conversion without requiring scattering particles
2Loss of energy
If scattering particles are used in the light conversion layer, then light conversion efficiency is improved, but light leakage increases
Solution Approach 1:
The patent removes scattering particles that caused light leakage while maintaining light conversion efficiency through geometric structural modifications
Solution Approach 2:
The patent converts the harmful effect of light leakage into a beneficial outcome by using controlled reflective surfaces and geometric configurations to redirect light paths, ensuring that light is converted efficiently without unwanted leakage
3Illumination intensity
If quantum dot photoluminescent materials are combined with micro LEDs to achieve wide color gamut, then display effect is improved, but manufacturing complexity increases
Solution Approach 1:
The patent removes scattering particles from the manufacturing process while maintaining the quantum dot photoluminescent material combination, simplifying the manufacturing process without compromising display effect quality
Solution Approach 2:
The patent applies different material compositions and geometric configurations to specific regions of the light conversion layer, optimizing local optical properties to achieve wide color gamut while maintaining overall manufacturing simplicity
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 light conversion efficiency by ensuring that light is sufficiently converted and reduces light leakage, while simplifying the manufacturing process by avoiding the complexity of adding scattering particles, thus achieving better color purity and reduced process difficulties.
Implementation Method 1
a quantum dot photoluminescent material has characteristics of wide color gamut, pure light color and the like, and thus a display effect of high brightness and wide color gamut may be achieved by combining the quantum dot photoluminescent material with micro light-emitting diodes (Micro LEDs) emitting blue light
Implementation Method 2
The first material layer is configured such that a portion of light emitted by the light-emitting element corresponding to a region where the first material layer is located is incident into the light conversion layer through the first material layer
Implementation Method 3
The second material layer, the third material layer and the fourth material layer are configured such that light unconverted by the light conversion layer is reflected on surfaces of a structure formed by the second material layer, the third material layer and the fourth material layer
Data Source
AI summary
A light-emitting device includes: a light-emitting element; a light conversion layer disposed on a light exit side of the light-emitting element and including a first portion and a second portion located on a side of the first portion in a first direction; a first material layer disposed between the light-emitting element and the light conversion layer and configured such that light emitted by the light-emitting element is incident into the light conversion layer; and a second material layer on a side of the first material layer in the first direction, a third material layer on a side face of the light conversion layer, and a fourth material layer on a side of the light conversion layer away from the light-emitting element, which are configured such that light unconverted by the light conversion layer is reflected on surfaces of a structure formed by the second, third and fourth material layers.