Light Emitting Device With Asymmetrical Recesses For Color Mixing
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Solution Overview
Problem
Conventional semiconductor light emitting devices are limited in producing mixed color light and enhancing light concentration and directivity, as they typically have only one recess for mounting a light emitting element, preventing the mixing of light from multiple elements.
Innovation Solution
A light emitting device with a package featuring multiple recesses, each with a unique angle configuration in a vertical cross section, allowing for the mixing of light from adjacent elements and controlling directivity, and using a transparent resin to enhance light extraction and emission output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If only one recess is formed in the substrate for mounting a light emitting element, then the device structure is simple, but it is impossible to obtain mixed color light by using multiple light emitting elements
Solution Approach 1:
The substrate is divided into multiple recesses (first recess and second recess) to accommodate different light emitting elements. Each recess is independently formed with specific geometric features (inclined side edges) to enable separate mounting of light emitting elements while maintaining overall structural integration. This segmentation allows multiple elements to be mounted on a single substrate, enabling color mixing functionality.
2Adaptability or versatility
If multiple semiconductor light emitting devices are aligned in parallel to produce mixed color light, then color mixing is possible, but one device enhances light concentration causing adjacent devices' light to fail to mix properly
Solution Approach 1:
Each recess is designed with specific local geometric characteristics, including inclined side edges with particular angles relative to the vertical line. The first recess has a first inclined side edge and the second recess has a second inclined side edge, creating localized light reflection and diffusion patterns. This local quality control ensures that light from adjacent elements mixes properly without excessive concentration in any single direction.
3Ease of manufacture
If the recess has symmetrical inclined side edges with equal angles, then the manufacturing is easier, but the light directivity and emission output cannot be optimized
Solution Approach 1:
The recesses are designed with asymmetrical inclined side edges. The first inclined side edge of the first recess and the second inclined side edge of the second recess have different angles relative to the vertical line. This asymmetry is intentionally introduced to control light directivity and enhance emission output by optimizing the reflection and diffusion characteristics of light from the mounted elements, while still maintaining manufacturability through precise molding techniques.
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 device achieves uniform mixed light emission with improved directivity and higher emission output by mixing light from multiple elements, enabling the production of white light and various hues with excellent color mixing properties.
Implementation Method 1
a light emitting element 104 and light L are encapsulated by a transparent resin 4 forming a lens 106
Data Source
AI summary
A light emitting device capable of emitting an excellent mixed color light, and a light emitting device capable of enhancing the concentration of mixed light or the directivity of emission is provided. The light emitting device comprises a light emitting element and a package. The package includes at least two recesses each having a bottom surface for mounting a light emitting element thereon and a side surface extending from the bottom surface, wherein each recess has, in a vertical cross section of the recess, a vertical line passing through the center of the bottom surface of the recess which is different than a vertical line passing through the intersection of a first straight line extending along an inclined edge of the recess and a second straight line extending along an inclined edge on another side of the recess.