LED Lighting Module With Convex Resin Optics for Uniform Line Emission
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Solution Overview
Problem
Existing lighting technologies using light emitting diodes (LEDs) face challenges in achieving a line-shaped surface light source with improved luminosity and design freedom, while also addressing light efficiency and uniformity issues.
Innovation Solution
A lighting device is designed with a substrate, a plurality of light sources disposed on the substrate, a resin layer covering the light sources, and a reflective layer on top of the resin layer. The resin layer has an exit surface with convex portions aligned with the light sources, enhancing light extraction and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a light emitting diode is used as a vehicle lamp, then power consumption is reduced, but the light emitting area is insufficient due to the small exit angle of the LED
Solution Approach 1:
The patent transforms the light emission from a point source (0D) to a line source (1D) by arranging multiple LEDs along a curved path and using a resin layer with convex portions to distribute light across a linear surface, effectively increasing the light emitting area while maintaining LED power efficiency
Solution Approach 2:
The patent divides a single large light source into multiple smaller LED segments arranged along a curve, with each LED contributing to the overall line-shaped light emission, thereby achieving both the energy efficiency of individual LEDs and the extended light emitting area of a line source
2Area of stationary object
If multiple light sources are arranged to form a line-shaped light source, then light emitting area is increased, but light uniformity and extraction efficiency deteriorate
Solution Approach 1:
The patent applies local quality by creating convex portions at specific locations on the resin layer that correspond to individual LED positions, allowing each region to optimize light extraction for its local light source while contributing to overall uniformity through the curved arrangement
Solution Approach 2:
The patent uses a curved arrangement of LEDs and corresponding convex portions on the resin layer to distribute light more evenly across the line-shaped emission surface, with the curvature helping to spread light from multiple sources uniformly along the linear path
3Illumination intensity
If a resin layer with convex portions is used to enhance light extraction, then light uniformity is improved, but device complexity increases
Solution Approach 1:
The patent merges the light distribution function into the resin layer itself by forming convex portions directly on the resin, combining the structural support, light extraction, and uniformity distribution functions into a single integrated component rather than adding separate optical elements
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 provides a line-shaped surface light source with improved luminosity, design freedom, and light uniformity, while simplifying the manufacturing process and reducing light loss.
Implementation Method 1
the resin layer includes an exit surface facing the light sources, the exit surface of the resin layer includes a plurality of convex portions
Implementation Method 2
a first reflective layer disposed on the resin layer
Data Source
AI summary
A lighting device disclosed in an embodiment of the invention includes a substrate; a plurality of light sources disposed on the substrate; and a resin layer disposed on the substrate and the plurality of light sources, and a first reflective layer disposed on the resin layer, wherein the resin layer includes an exit surface facing the light sources, the exit surface of the resin layer includes a plurality of convex portions, the plurality of light sources are disposed on a virtual curve, wherein a straight line passing through centers of the first and second light sources adjacent to each other and the centers of each convex portion may be disposed at an obtuse angle with respect to a straight line connecting the adjacent first and second light sources.