Curved High and Low Refractive Index Layers for Micro LED Light Distribution
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Solution Overview
Problem
Micro LED displays face challenges in efficiently directing light in the normal direction due to the properties of micro light emitting diodes, leading to potential deterioration of display quality when a volume hologram is used without modifications.
Innovation Solution
A display device with a substrate, pixels, light emitting elements, and a first light diffusion layer featuring high and low refractive index layers alternately layered and curved, which scatters light to enhance its distribution in the normal direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a volume hologram is used for LED display without modification, then the display structure is simple, but the display property deteriorates due to insufficient light in normal direction
Solution Approach 1:
The patent applies curvature to the interface between high and low refractive index layers, forming an arc-shaped boundary that scatters light toward the normal direction. This curved interface design redirects obliquely emitted LED light to achieve higher illumination intensity in the normal direction, resolving the contradiction between maintaining simple structure and improving light distribution.
Solution Approach 2:
The patent modifies the physical parameters of the display structure by introducing alternating high and low refractive index layers with specific curvature radii. By changing the refractive index parameter distribution and interface geometry, the light scattering characteristics are optimized to enhance normal direction illumination without significantly complicating the overall device structure.
2Ease of operation
If light diffusion layer with curved layers is added, then light scattering in normal direction is improved, but the device structure becomes more complex
Solution Approach 1:
The light diffusion layer is segmented into multiple alternating high and low refractive index layers, each with specific thickness and curvature characteristics. This segmentation allows independent optimization of each layer's light scattering contribution, improving overall visibility while managing structural complexity through modular design.
Solution Approach 2:
The patent employs composite material structure with alternating high and low refractive index layers (e.g., resin layers with different refractive indices). This composite approach enhances light scattering efficiency and observer visibility by creating multiple refraction and reflection interfaces, while the layered composite structure provides systematic organization that manages complexity.
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 light diffusion layer effectively increases the relative amount of light emitted in the normal direction, improving display quality by scattering light within a specific angular range and enhancing observer visibility.
Implementation Method 1
a first light diffusion layer including a plurality of light diffusion structures and having a first surface and a second surface opposite to the first surface, the second surface facing the substrate with the light emitting elements interposed between the second surface and the substrate. The light diffusion structures each include a plurality of high refractive index layers and a plurality of low refractive index layers. The high refractive index layers and the low refractive index layers are alternately layered in a thickness direction of the first light diffusion layer.
Data Source
AI summary
According to an aspect, a display device includes: a substrate; a plurality of pixels provided to the substrate; a plurality of light emitting elements provided to the pixels; and a first light diffusion layer including a plurality of light diffusion structures and having a first surface and a second surface opposite to the first surface, the second surface facing the substrate with the light emitting elements interposed between the second surface and the substrate. The light diffusion structures each include a plurality of high refractive index layers and a plurality of low refractive index layers. The high refractive index layers and the low refractive index layers are alternately layered in a thickness direction of the first light diffusion layer. The high refractive index layers and the low refractive index layers are each curved and recessed in a direction from the first surface toward the second surface.