Recessed LED Package Lens Layout for Forward Light Extraction
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Solution Overview
Problem
Existing light-emitting devices struggle to efficiently extract light in the forward direction while maintaining a compact size, particularly in surface-mountable configurations.
Innovation Solution
A light-emitting device design featuring a resin package with recessed portions for light-emitting elements and reflective members, combined with convex lenses above each element, where the lenses have widths that are no more than five times the width of the elements, allowing for high efficiency and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional light-emitting device structures are used, then light extraction in forward direction can be achieved, but device size cannot be miniaturized
Solution Approach 1:
The device is divided into multiple recessed portions, each containing a light-emitting element with its own reflective member and lens. This segmentation allows independent optimization of each unit while achieving high overall light extraction efficiency in a compact footprint.
Solution Approach 2:
The patent utilizes vertical stacking of light-emitting elements in recessed portions to achieve miniaturization in the planar dimensions while maintaining effective light extraction through the third dimension (vertical light path control via lenses and reflective members).
2Productivity
If device size is reduced, then miniaturization is achieved, but light extraction efficiency in forward direction deteriorates
Solution Approach 1:
Each recessed portion is designed with specific local optical qualities including reflective members positioned at optimized angles and lenses with specific curvature radii. This local optimization ensures high light extraction efficiency from each element while maintaining compact overall device dimensions.
Solution Approach 2:
Lenses with convex curved surfaces are used above each light-emitting element to focus and direct light in the forward direction. The curved geometry efficiently extracts light from the elements while maintaining a compact vertical profile, enabling miniaturization without sacrificing light extraction performance.
3Productivity
If lens width is increased, then light extraction efficiency improves, but device complexity and stress on elements increases
Solution Approach 1:
The lens width is optimized to be no more than five times the width of the light-emitting element, providing sufficient light extraction capability without excessive dimensions. This partial action approach achieves adequate light extraction efficiency while avoiding increased device complexity and stress on elements that would result from larger lens dimensions.
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 design achieves high light extraction efficiency in the forward direction and enables the device to be miniaturized, reducing stress on elements and facilitating easier wire connections and reflective member application.
Implementation Method 1
a first reflective member disposed in the first recessed portion and surrounding, in a plan view, the first light-emitting element
Implementation Method 2
a mold resin portion including a first lens portion positioned above the first light-emitting element. Each of the first lens portion has a convex shape protruding upward
Data Source
AI summary
A light-emitting device includes a resin package including a plurality of recessed portions, a plurality of light-emitting elements, each disposed in the corresponding one of the plurality of recessed portions, a plurality of reflective members, and a mold resin portion including a first lens portion, a second lens portion, and a third lens portion. In the plan view, a maximum width of the first lens portion is less than a maximum width of an inner upper surface of the corresponding one of the plurality of recessed portions, a maximum width of the second lens portion is less than a maximum width of an inner upper surface of the corresponding one of the plurality of recessed portions, and a maximum width of the third lens portion is less than a maximum width of an inner upper surface of the corresponding one of the plurality of recessed portions.