LED Frame Curvature for Higher Top-Surface Light Extraction
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Solution Overview
Problem
Conventional light emitting devices have limited light extraction efficiency due to the uniform surface of the frame body, which restricts the reflection direction and reduces the overall light emission from the light emitting element, particularly from the top surface of LEDs.
Innovation Solution
The light emitting device incorporates a frame body with a first and second inner circumferential curved surface, where the connection portion is arranged at the same height as the top surface of the light emitting element, and the inclination angle of the first surface is smaller than the second surface, enhancing light extraction efficiency by optimizing the reflection direction and reducing attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the frame body has only a uniform surface, then the structure is simple, but the reflection direction is limited and light extraction efficiency is reduced
Solution Approach 1:
The frame body incorporates curved surfaces (first and second curved surfaces) instead of uniform flat surfaces. These curved surfaces have different inclination angles that enable multi-directional reflection of light from the LED, significantly improving light extraction efficiency while maintaining manufacturing feasibility through molding processes.
2Productivity
If the frame body is configured by a plurality of curved surfaces, then light extraction efficiency is improved, but the manufacturing complexity increases
Solution Approach 1:
The frame body features localized curved surfaces with specific inclination angles positioned at particular locations rather than complex curvature throughout. The first curved surface has a first inclination angle and the second curved surface has a second inclination angle, creating optimal light reflection paths while keeping the overall structure relatively simple and manufacturable.
3Productivity
If the connection portion is arranged at the same height as the top surface of the light emitting element, then light extraction from the top surface is optimized, but the structural alignment precision requirement increases
Solution Approach 1:
The curved surfaces are designed with specific inclination angles that optimize light reflection paths from the LED top surface. The connection portion height alignment at the same level as the LED top surface maximizes light extraction efficiency, while the curved geometry provides tolerance compensation for manufacturing variations.
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 significantly improves light extraction efficiency by allowing more light to be emitted externally with minimal attenuation, particularly from the top surface of the LED, resulting in enhanced optical characteristics and chromaticity uniformity.
Implementation Method 1
a frame body arranged on the top surface of the substrate so as to surround the light emitting element and reflecting light from the light emitting element
Data Source
AI summary
The light emitting device has a substrate, a light emitting element arranged on the top surface of the substrate, a frame body arranged on the top surface of the substrate so as to surround the light emitting element and reflecting light from the light emitting body, and a sealing material arranged inside the frame body and sealing the light emitting element, and the frame body has a first frame portion having a first inner circumferential curved surface protruding to the side of the light emitting element and a second frame portion having a second inner circumferential curved surface, and a connection portion of the first frame portion and the second frame portion is arranged so as to have the same height as that of the top surface of the light emitting element.