LED Package With Convex Mounting Part To Reduce Light Blockage
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Solution Overview
Problem
Conventional LED packages experience reduced light emitting efficiency and brightness due to light emitted from the side surfaces of LED chips being blocked by adjacent chips, leading to significant light loss.
Innovation Solution
The LED package design features a mounting part with a non-planar, upwardly convex cross-section, allowing adjacent LED chips to have opposing side surfaces facing different directions, preventing light blockage and enhancing light extraction efficiency. This design includes a reflector cup and a resin encapsulant with phosphors for producing white light, and elongated LED chips with a high length-to-width ratio for improved light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple LED chips are mounted on a planar surface, then the brightness and color variety are improved, but the light emitting efficiency is degraded due to light blockage
Solution Approach 1:
The mounting part is designed with an asymmetric non-planar top portion featuring upwardly convexed cross-section, causing adjacent LED chips to have opposing side surfaces facing different directions. This asymmetric arrangement prevents light blockage between chips while maintaining multiple chip configuration for enhanced brightness and color output.
Solution Approach 2:
The invention transitions from a two-dimensional planar mounting surface to a three-dimensional non-planar surface with upward convexity. This dimensional change allows LED chips to be positioned at different heights and angles, enabling side-emitted light to escape without being blocked by adjacent chips, thereby improving light extraction efficiency.
2Area of stationary object
If LED chips are mounted in close proximity, then the device size is reduced, but light blockage occurs between adjacent chips
Solution Approach 1:
By utilizing the third dimension (vertical height) through the non-planar mounting surface with upward convexity, the invention allows multiple LED chips to be positioned in close horizontal proximity while maintaining angular separation. This enables compact package size without sacrificing light extraction efficiency, as chips face different directions to prevent mutual light blockage.
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 significantly increases light emitting efficiency and brightness by minimizing light loss from side-emitted light, allowing for higher brightness and efficiency in LED packages, especially when using multiple colored LEDs or phosphor-converted white light.
Implementation Method 1
the body has a reflector cup formed in an upper part thereof
Implementation Method 2
the resin encapsulant has a yellow phosphor (or red or green phosphor) dispersed therein
Data Source
AI summary
An LED package improved in efficiency and brightness. In the package, a body has a mounting part thereon. A plurality of light emitting diode chips are mounted on the mounting part. The mounting part has a cross-section upwardly convexed with a non-planar top portion so that at least two adjacent ones of the light emitting diode chips have opposing side surfaces facing a different direction from each other.