Rectangular LED Package with Isotropic Lens for Anisotropic Illumination
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Solution Overview
Problem
Existing light emitting device packages face challenges in achieving anisotropic illumination distribution using anisotropic lenses, which are difficult to design and manufacture, leading to degraded optical efficiency.
Innovation Solution
A light emitting device package with an isotropic lens having an aspherical surface shape, where the square root of the sum of the squares of the lengths of its sides is smaller than the lens diameter, and the longer side is at least 5/3 times more than the shorter side, allowing for easy design and manufacturing while achieving anisotropic illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an anisotropic lens is used to achieve anisotropic illumination distribution, then the light diffusion in a specific direction is improved, but the manufacturing complexity and difficulty increase
Solution Approach 1:
The patent applies asymmetry by arranging light emitting devices in an asymmetric configuration where the number of devices in the first direction is at least 5/3 times the number in the second direction. This asymmetric arrangement creates anisotropic illumination distribution without requiring an anisotropic lens, thereby resolving the contradiction between achieving directional light diffusion and maintaining ease of manufacture.
2Illumination intensity
If an anisotropic lens is used to achieve anisotropic illumination distribution, then the light diffusion in a specific direction is improved, but the device complexity increases
Solution Approach 1:
The patent replaces the complex anisotropic lens with a simpler asymmetric arrangement of light emitting devices. The asymmetric configuration (with device counts in a 5:3 ratio or greater) naturally produces anisotropic illumination, eliminating the need for complex lens design and reducing overall device complexity while maintaining the desired illumination characteristics.
3Ease of manufacture
If an isotropic lens is used, then the manufacturing ease is improved, but the anisotropic illumination distribution is degraded
Solution Approach 1:
The patent introduces an intermediary element - the asymmetric arrangement of light emitting devices - that mediates between the isotropic lens and the desired anisotropic illumination. The isotropic lens maintains its manufacturing simplicity, while the asymmetric device arrangement acts as an intermediary to create the anisotropic illumination distribution, resolving the contradiction between manufacturing ease and illumination performance.
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 enables efficient anisotropic illumination distribution with reduced manufacturing time and costs, improving optical efficiency and achieving the desired directional light diffusion in linear lighting applications.
Implementation Method 1
A light emitting device such as a light emitting diode (LED) is a type of a semiconductor device that converts electric energy into optical energy through a P-N junction structure of a compound semiconductor
Implementation Method 2
Since the blue LED or UV LED may implement white light or other monochromatic lights using a phosphor material
Implementation Method 3
a molding unit that has a shape of an isotropic lens disposed on the substrate to surround the light emitting device, wherein a square root of {(length of the first side)² + (length of the second side)²} is smaller than a diameter of the molding unit
Data Source
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AI summary
Disclosed are a light emitting device package and a light apparatus including the same. The light emitting device package according to an embodiment of the present invention includes a light emitting device that has a first side extending in a first direction and a second side extending in a second direction, and is disposed on a substrate, and a molding unit that has a shape of an isotropic lens disposed on the substrate to surround the light emitting device, wherein a square root of {(length of the first side)2 + (length of the second side)2} is smaller than a diameter of the isotropic lens, and the length of the first side is at least 5/3 times more than the length of the second side. According to the present invention, the light emitting device may be formed into a rectangular shape or a plurality of light emitting devices may be arranged in a rectangular shape, and therefore an anisotropic illumination distribution may be obtained while applying an isotropic lens which can be easily designed and manufactured, thereby reducing manufacturing time and costs while increasing optical efficiency.