Micro-LED Display Wavelength Conversion With Protruding Optical Patterns
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Solution Overview
Problem
Existing display devices, particularly micro-LED displays, face challenges in achieving high luminous efficiency due to limitations in light conversion and output path management.
Innovation Solution
Incorporating a wavelength conversion layer with dispersed particles and an optical member featuring a protruding pattern to adjust light paths, along with a color filter having a higher refractive index than the base resin, to enhance light conversion and output efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wavelength conversion layer is used to convert light wavelength in micro-LED display, then different colors can be represented, but light loss occurs during wavelength conversion reducing luminous efficiency
Solution Approach 1:
The patent applies local quality by creating region-specific wavelength conversion layers with different materials and properties. Different emission areas have wavelength conversion layers tailored to their specific light conversion needs, optimizing conversion efficiency for each region while minimizing overall light loss.
Solution Approach 2:
The patent introduces an optical member as an intermediary between the light-emitting element and the wavelength conversion layer. This optical member includes a protruding pattern that focuses and directs light onto the wavelength conversion particles, improving the coupling efficiency and reducing light loss during the wavelength conversion process.
2Productivity
If conventional optical structures are used without protruding patterns, then device complexity is low, but light output efficiency and luminous performance are insufficient
Solution Approach 1:
The patent employs a protruding pattern with a curved or dome-shaped surface on the optical member. This curved structure acts as a micro-lens that focuses and extracts light more efficiently from the wavelength conversion layer, significantly improving light output efficiency without requiring complex optical systems.
Solution Approach 2:
The optical member is segmented into multiple protruding patterns corresponding to different emission areas. Each protruding pattern is independently optimized for its specific location and function, allowing for localized light management while maintaining overall system 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
Improves light efficiency by effectively converting and directing light emissions, resulting in enhanced luminous performance.
Implementation Method 1
a wavelength conversion layer over the light-emitting element in the emission area, and comprising a base resin and wavelength conversion particles dispersed in the base resin and configured to convert a wavelength of light emitted from the light-emitting element
Implementation Method 2
an optical member on the wavelength conversion layer and the partition wall and configured to adjust a path of light output from the wavelength conversion layer, wherein the optical member comprises an optical layer and a first protruding pattern protruding from the optical layer toward the wavelength conversion layer
Data Source
AI summary
A display device includes a substrate; a partition wall on the substrate; a light-emitting element located in an emission area partitioned by the partition wall on the substrate and extended in a thickness direction of the substrate; a wavelength conversion layer over the light-emitting element in the emission area, and including a base resin and wavelength conversion particles dispersed in the base resin and configured to convert a wavelength of light emitted from the light-emitting element; and an optical member on the wavelength conversion layer and the partition wall and configured to adjust a path of light output from the wavelength conversion layer, and the optical member includes an optical layer and a first protruding pattern protruding from the optical layer toward the wavelength conversion layer.