Light-Emitting Element Insulation Film for Higher Top Emission
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Solution Overview
Problem
Existing light emitting elements, particularly inorganic LEDs, face challenges in achieving high top emission efficiency due to light reflection from insulation coating films, which reduces the amount of light emitted in desired directions.
Innovation Solution
The proposed light emitting element incorporates an insulation film with a scattering particle layer on the insulation coating film, allowing emitted light to travel in one direction by scattering or amplifying the light, thereby increasing the amount of light emitted perpendicular to the element's extension direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulation coating film is used to protect the semiconductor crystal, then reliability is improved, but light emission efficiency deteriorates due to light reflection
Solution Approach 1:
A scattering layer is introduced as an intermediary between the insulation coating film and the active layer. This scattering layer mediates the interaction between light and the insulation film by scattering incident light before it reaches the reflective insulation film, thereby reducing the harmful reflection effect while maintaining the protective function of the insulation film.
Solution Approach 2:
The scattering layer changes the optical properties of the insulation film system by introducing light scattering capability. This modifies how light interacts with the insulation film, transforming the purely reflective interface into a scattering interface that redirects light in multiple directions, increasing top emission efficiency.
2Illumination intensity
If light is emitted in all directions from the active layer, then luminosity is improved, but top emission efficiency deteriorates due to light traveling in undesired directions
Solution Approach 1:
The scattering layer is positioned locally at the top surface of the insulation film, creating a localized region with different optical properties. This local modification affects only the light emission in the top direction, scattering light that would otherwise travel in undesired directions, while preserving the overall luminosity of the device.
Solution Approach 2:
The scattering layer redirects light from one-dimensional propagation (along the semiconductor layer) to three-dimensional distribution, scattering light in multiple directions including upward toward the top surface. This dimensional change increases the proportion of light emitted in the desired top direction.
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 enhances the top emission efficiency of the light emitting element by increasing the amount of light emitted in directions perpendicular to the element's extension direction, improving display performance.
Implementation Method 1
a first light conversion particle that scatters incident light emitted from the active layer
Implementation Method 2
a second light conversion particle that amplifies the intensity of the incident light
Data Source
AI summary
Provided are a light emitting element and a display device comprising same. The light emitting element comprises: a first conductivity type semiconductor doped with a dopant having a first polarity, a second conductivity type semiconductor doped with a dopant having a second polarity opposite to the first polarity; an active layer between the first conductivity type semiconductor and the second conductivity type semiconductor; and an insulation film which surrounds at least a side surface of the active layer, wherein the insulation film includes an insulation coating film and at least one light conversion particle on at least a portion of the insulation coating film.