LED Reflective Resin Layer for Uniform Surface Luminance
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Solution Overview
Problem
Light emitting diodes (LEDs) used in lighting applications face issues with limited emission angles, heat-induced performance degradation, and non-uniform light distribution, leading to hot spots and reduced luminosity, especially in linear or surface light sources.
Innovation Solution
A lighting apparatus with a substrate, light emitting devices, a first reflective layer, a resin layer, and a second reflective layer, featuring convex and concave reflective surfaces that guide light emission to enhance uniformity and luminance, utilizing a resin layer with protruding portions and concave portions to reflect light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If light emitting diodes are used as light sources, then power consumption is reduced and lifespan is extended, but emission angle is limited and light uniformity is reduced
Solution Approach 1:
The patent employs reflective surfaces with convex and concave curved shapes on the resin layer to redirect light from LEDs with limited emission angles. The curved reflective surfaces bounce light in multiple directions, effectively increasing the emission angle and spreading light more uniformly across the illumination area.
Solution Approach 2:
The resin layer is designed with spatially varying reflective properties, where different regions contain convex reflective surfaces, concave reflective surfaces, or both. This local differentiation of reflective characteristics allows precise control over light distribution patterns in different areas, optimizing both emission angle and uniformity.
2Object-affected harmful factors
If light emitting diodes are used as light sources, then environmental friendliness is improved, but heat generation causes performance deterioration and hot spots
Solution Approach 1:
The resin layer incorporates convex and concave reflective surfaces in specific spatial arrangements that create localized light redistribution zones. This local variation in reflective properties helps dissipate concentrated light energy and reduce hot spot formation, managing heat-related performance issues.
3Ease of manufacture
If conventional reflective surfaces are used, then manufacturing is simplified, but light uniformity and luminance are reduced
Solution Approach 1:
The patent integrates convex and concave curved reflective surfaces directly into the resin layer structure. While more complex than flat surfaces, these curved features can be manufactured using molding techniques, achieving improved light uniformity through the geometric light-redistributing properties of the curved surfaces.
Solution Approach 2:
The resin layer functions as a composite optical element combining transparent resin material with integrated reflective surfaces. This composite structure achieves both light transmission and reflection functions in a single component, improving light uniformity while maintaining manufacturing feasibility through integrated production.
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 minimizes light loss and ensures uniform luminance across a surface or line, preventing hot spots and dark areas, providing improved luminance and uniformity in lighting applications.
Implementation Method 1
the first side surface includes a plurality of first reflective surfaces having a convex shape with respect to the light emitting surface of the light emitting devices and at least one second reflective surface having a concave shape with respect to the light emitting surface of the light emitting devices, and light emitted through the light emitting surfaces of the light emitting devices may be reflected from the first side surfaces and emitted through the second side surface
Data Source
AI summary
The lighting apparatus disclosed to an embodiment includes a substrate, a plurality of light emitting devices disposed on the substrate, a first reflective layer disposed on the substrate, a resin layer on the first reflective layer, and a second reflective layer on the resin layer and the resin layer includes a first side surface facing the light emitting surfaces of the plurality of light emitting devices and a second side surface opposite to the first side surface, and the first side surface includes a plurality of first reflective surfaces convex with respect to the light emitting surfaces of the light emitting devices and at least one second reflective surface having a concave shape with respect to the light emitting surfaces of the light emitting devices, wherein the plurality of first reflective surfaces are disposed on a region corresponding to each of the plurality of light emitting devices in an optical axis direction, and the second reflective surface is disposed between the plurality of first reflective surfaces, and light emitted through the light emitting surfaces of the light emitting devices may be reflected from the first side surfaces and emitted through the second side surface.