Micro-LED Sidewall Diffusion Structure for Light Extraction
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Solution Overview
Problem
Existing display devices face challenges in improving light extraction efficiency and reducing external light reflection, leading to issues such as power consumption and visual artifacts like stain defects.
Innovation Solution
A micro-LED display with a dual-layer sidewall diffusion structure using fine particles with differing refractive indices, integrated micro driver circuits, and ductile materials in bendable regions to enhance optical performance and mechanical durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer sidewall diffusion structure is used, then the structure is simple, but light extraction efficiency is insufficient and external light reflection occurs
Solution Approach 1:
The patent applies composite materials by creating a dual-layer sidewall diffusion structure where the first sidewall diffusion layer and second sidewall diffusion layer are made of different materials with different refractive indices. This composite structure enhances light extraction efficiency by reducing total internal reflection at the interface between the light-emitting element and the sidewall diffusion layers, while the gradual refractive index transition minimizes external light reflection.
Solution Approach 2:
The patent transitions from a single-layer to a dual-layer sidewall diffusion structure, adding an additional dimension of complexity in the vertical stacking direction. The first sidewall diffusion layer is positioned at a first height and the second sidewall diffusion layer is positioned at a second height different from the first height, creating a multi-level diffusion structure that improves light extraction through enhanced optical path management.
2Loss of energy
If a dual-layer sidewall diffusion structure with different refractive indices is used, then light extraction efficiency is improved, but the structure becomes more complex
Solution Approach 1:
The patent applies local quality by assigning different materials with different refractive indices to different regions of the sidewall diffusion structure. The first sidewall diffusion layer and second sidewall diffusion layer are made of different materials, allowing each layer to be optimized for specific optical functions. This localized differentiation enables improved light extraction efficiency without requiring complete redesign of the entire structure.
3Ease of manufacture
If brittle inorganic layers are used in bendable regions, then manufacturing is easier, but mechanical durability decreases
Solution Approach 1:
The patent applies flexible shells and thin films by replacing brittle inorganic layers with flexible organic layers in the bendable regions of the display device. This substitution maintains the structural integrity and optical performance while enabling the device to withstand bending stresses, thereby improving mechanical durability and reliability for flexible or foldable display applications.
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 solution improves light extraction efficiency, reduces power consumption, and minimizes visual artifacts by enhancing optical performance and mechanical durability.
Implementation Method 1
first sidewall diffusion layer and second sidewall diffusion layer laminated around the bank and the light-emitting element... first sidewall diffusion layer may include a plurality of first fine particles, and the second sidewall diffusion layer may include a plurality of second fine particles having a refractive index different from a refractive index of the plurality of first fine particles
Implementation Method 2
first sidewall diffusion layer may include a plurality of first fine particles, and the second sidewall diffusion layer may include a plurality of second fine particles having a refractive index different from a refractive index of the plurality of first fine particles
Implementation Method 3
transparent electrode disposed on the at least one light-emitting element and the sidewall diffusion layer
Data Source
AI summary
The present application relates to a display device. A display device according to an exemplary embodiment of the present disclosure includes a substrate, at least one driving chip disposed on the substrate, a bank disposed on the driving chip, a first electrode disposed on the bank and electrically connected to the at least one driving chip, a light-emitting element disposed on the first electrode, and first and second sidewall diffusion layers laminated around the bank and the light-emitting element, wherein the first sidewall diffusion layer includes a plurality of first fine particles, and the second sidewall diffusion layer includes a plurality of second fine particles having a refractive index different from that of the plurality of first fine particles.