LED Lighting Module With Curved Exit Surfaces for Uniform Line Light
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Solution Overview
Problem
Existing lighting devices using light emitting diodes (LEDs) face challenges in achieving a line-shaped surface light source with sufficient luminous intensity, as the exit angle of light emitted from LEDs is small, leading to light loss and reduced light efficiency.
Innovation Solution
A lighting device is designed with a substrate, multiple LEDs, a first reflective layer, a resin layer, and a second reflective layer. The resin layer has a first surface with a first exit surface having a curvature and a second exit surface with a flat or second curvature, optimizing light emission and distribution.
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 small exit angle
Solution Approach 1:
The patent transitions from point-source LED emission to line-shaped surface light source by arranging multiple LEDs in a matrix pattern on a substrate, utilizing two-dimensional spatial distribution to expand the effective light emitting area while maintaining the energy efficiency of individual LED components
Solution Approach 2:
Multiple light emitting diodes are combined in a matrix arrangement with their light paths merged and redirected through reflective layers to create a unified line-shaped light source, achieving both the energy efficiency of individual LEDs and the expanded emitting area of a distributed array
2Area of stationary object
If the exit angle of LED light is increased to expand light emitting area, then light efficiency is reduced due to light loss
Solution Approach 1:
The patent employs curved reflective layers (first and second reflective layers) that follow the light propagation paths, using continuous curvature to redirect light rays efficiently from multiple LEDs to form a line-shaped light source while minimizing light loss through optimal angular redirection
Solution Approach 2:
The light guiding structure is divided into multiple segments corresponding to individual LED emission zones, with each segment's reflective layer optimized to handle light from specific LEDs, allowing independent optimization of each light path to maintain high efficiency while achieving overall line-shaped emission
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 lighting device effectively provides a line-shaped surface light source with improved luminous intensity, reduced dark portions, and enhanced light uniformity, while also increasing design flexibility and optical reliability.
Implementation Method 1
a first reflective layer disposed on the substrate; a resin layer disposed on the first reflective layer; and a second reflective layer disposed on the resin layer
Implementation Method 2
the first surface of the resin layer includes a first exit surface having a first curvature, and a second exit surface having a flat surface or a second curvature
Data Source
Figure 1
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AI summary
A lighting device disclosed in an embodiment of the invention includes a substrate; a plurality of light emitting devices on the substrate; a first reflective layer on the substrate; a resin layer on the first reflective layer; and a second reflective layer on the resin layer. The resin layer includes a first surface from which light emitted from the plurality of light emitting devices is emitted, and a second surface opposite to the first surface, wherein the first surface of the resin layer includes a first exit surface having a first curvature, and a second exit surface having a flat surface or a second curvature, wherein a maximum distance from the second surface to the first exit surface may be greater than a maximum distance from the second surface to the second exit surface.