Curved Microelement Light Extraction for High-Contrast Displays
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Solution Overview
Problem
Existing light emitting devices face challenges in improving luminous intensity and color contrast, leading to suboptimal image clarity due to inefficiencies in light extraction and color mixing.
Innovation Solution
A light emitting apparatus with a substrate, light emitting devices, and a molding layer that includes a microelement with a curved surface and a light control layer or collimator to enhance light extraction efficiency and color contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light emitting device structure is used, then the device is simple to manufacture, but the light extraction efficiency is low and luminous intensity is insufficient
Solution Approach 1:
The patent introduces a microelement with a curved surface (hemispherical or domed shape) positioned above the light emitting device. This curved surface extracts and redirects light that would otherwise be trapped by total internal reflection at the planar interface, significantly improving light extraction efficiency and luminous intensity without requiring complex internal structural modifications to the LED chip itself.
Solution Approach 2:
The patent adds a vertical dimension to light extraction by placing a microelement with a curved surface above the light emitting device. This three-dimensional structure creates additional light extraction pathways in the vertical direction, allowing light to escape at various angles and improving overall extraction efficiency without complicating the planar device structure.
2Quantity of substance
If light emitting devices are arranged closely to improve density, then the device density increases, but color mixing occurs and color contrast deteriorates
Solution Approach 1:
The patent introduces a light control layer positioned between adjacent light emitting devices that selectively transmits or blocks light based on wavelength. This segmentation approach allows different color lights from adjacent devices to be separated and directed to appropriate regions, preventing unwanted color mixing while maintaining high device density.
Solution Approach 2:
The light control layer acts as an intermediary between adjacent light emitting devices, mediating the interaction between their emitted lights. This intermediate layer selectively manages light transmission to prevent color mixing while allowing the devices to be closely spaced, thus maintaining both high density and good color contrast.
3Ease of manufacture
If a planar light extraction surface is used, then the manufacturing is simple, but light extraction efficiency is low due to total internal reflection
Solution Approach 1:
The patent replaces the conventional planar light extraction surface with a microelement featuring a curved surface (hemispherical or domed). This curved geometry eliminates total internal reflection at the interface by allowing light to exit at various angles, dramatically improving light extraction efficiency while maintaining manufacturing simplicity through a single added component rather than complex surface texturing.
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 luminous intensity and color contrast, resulting in enhanced light extraction efficiency and clearer images by reducing color differences based on viewing angle.
Implementation Method 1
a first microelement (140) disposed above the light emitting device (120)... The first microelement (140) may include a curved surface (U) formed in at least a region of at least one of an upper surface and a lower surface thereof
Implementation Method 2
a collimator (135) disposed between upper surfaces of the light emitting devices (120) and a lower surface of the first microelement (140) and including a curved surface (U)
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
The present disclosure relates to a light emitting apparatus and a display apparatus including the same, more particularly to a light emitting apparatus including a light emitting device and a display apparatus including the same. The light emitting apparatus (100) includes a substrate (110), at least one light emitting device (120) disposed on one surface of the substrate (110), and a molding layer (130) covering at least a region of the light emitting device (120), and further includes a first microelement (140) disposed above the light emitting device (120), wherein the first microelement (140) includes a curved surface (U) formed in at least a region of at least one of upper and lower surfaces thereof.