LED Lighting Module with Reflective Layers for Uniform Surface Emission
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Solution Overview
Problem
Existing lighting technologies using light emitting diodes (LEDs) in vehicles face challenges in expanding the light emitting area and improving design freedom due to their small emission angle, leading to non-uniform light distribution and potential hot spots.
Innovation Solution
A lighting module design featuring a substrate with LED devices, a resin layer, reflective members, and a wavelength conversion layer, where the distance between the LED surface and the exit surface is 5 to 10 times the resin layer height, enhancing light distribution and uniformity through reflective and wavelength conversion layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If light emitting diodes are used as vehicle lamps, then power consumption is reduced, but the emission angle is small leading to non-uniform light distribution
Solution Approach 1:
The patent transitions from point-source LED emission to surface light emission by arranging multiple LEDs on a planar substrate with reflective members beneath them. This dimensional arrangement transforms the light emission pattern from narrow angular beams to a broader surface illumination, achieving uniform light distribution across a larger area while maintaining the energy efficiency of LED technology.
Solution Approach 2:
The lighting module divides the light emission function into multiple discrete LED units arranged in an array on a substrate. Each LED is paired with its own reflective member, creating segmented light sources that collectively produce uniform surface illumination. This segmentation allows better control over light distribution patterns compared to a single large light source.
2Adaptability or versatility
If the light emitting area is increased, then design freedom is improved, but the small emission angle of LEDs creates hot spots and non-uniform distribution
Solution Approach 1:
Reflective members are introduced as intermediary elements positioned between the LED light sources and the exit surface. These reflective members redirect and diffuse the narrow-angle LED emission patterns, transforming concentrated light beams into broader, more uniform illumination across the surface. This intermediary structure enables increased light emitting area without creating hot spots.
Solution Approach 2:
The patent modifies the optical parameters of the system by changing the emission angle and distribution pattern through the combination of multiple LEDs arranged on a substrate with reflective members. This parameter transformation converts the inherent narrow emission angle of individual LEDs into a broader, more uniform light distribution pattern suitable for vehicle lamp applications.
3Area of stationary object
If multiple light emitting devices are arranged on a substrate, then the light emitting area increases, but achieving uniform light distribution becomes more difficult
Solution Approach 1:
The substrate serves multiple functions simultaneously: it provides mechanical support for mounting multiple LED devices, acts as a platform for positioning reflective members, and functions as a light-distributing surface. This multi-functionality enables the system to increase light emitting area while maintaining uniform light distribution through the integrated design of the substrate-LED-reflective member assembly.
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 improves luminous intensity and uniformity of surface light emission, increasing design freedom and optical reliability, suitable for vehicle lamps and display devices.
Implementation Method 1
a wavelength conversion layer disposed on one surface of the resin layer opposite to the light emitting surface of the light emitting devices
Implementation Method 2
a first reflective member disposed on the substrate; a second reflective member 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 emitting devices disposed on the substrate; a first reflective member disposed on the substrate; a resin layer disposed on the first reflective member; a second reflective member disposed on the resin layer; and a wavelength conversion layer disposed on one surface of the resin layer opposite to the light emitting surface of the light emitting device, wherein a distance from the light emitting surface to the one surface may be 5 to 10 times a height of the resin layer.