Taillight Resin Optical Pattern for Wider LED Light Distribution
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Solution Overview
Problem
Existing lighting devices using LEDs face challenges in increasing the light emitting area and improving light distribution efficiency due to the limited directivity angle of light emitted from LEDs.
Innovation Solution
A lighting device with a resin layer featuring an optical pattern portion that refracts and reflects light, enhancing light distribution efficiency and directionality, while maintaining a thin module thickness.
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 limited due to small directivity angle
Solution Approach 1:
The patent introduces a light guide plate with optical patterns on its lower surface that redirects light from point-source LEDs into planar light emission. By adding the dimensional transformation component (light guide plate), the system converts directional LED light into area-based illumination, resolving the contradiction between energy efficiency and light emitting area.
Solution Approach 2:
The light guide plate acts as an intermediary between the LED light source and the final light emission. It receives directional light from LEDs and transforms it into area-based illumination through optical patterns, mediating the transition from point-source to surface light emission while maintaining LED energy efficiency.
2Productivity
If optical pattern portion is added to improve light distribution, then light distribution efficiency is improved, but device thickness increases
Solution Approach 1:
The optical patterns are applied locally on the lower surface of the light guide plate rather than requiring thick optical elements throughout the entire module. This localized optical modification achieves efficient light redistribution while maintaining overall module thinness, resolving the contradiction between light distribution efficiency and device thickness.
3Productivity
If optical pattern portion is disposed inside the module, then light distribution is improved, but reliability decreases due to potential defects
Solution Approach 1:
The optical patterns are extracted from the internal structure and applied only on the lower surface of the light guide plate. This extraction eliminates the need for complex internal optical elements that could create defect points, achieving effective light distribution while improving reliability by reducing potential failure locations.
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 device improves light distribution characteristics by increasing the amount of emitted light and providing directionality, while reducing the thickness and enhancing reliability.
Implementation Method 1
The lighting device refracts the light by the optical pattern portion on the surface of the resin layer, so that an amount of emitted light may be increased.
Implementation Method 2
the light reflected by the optical pattern portion on the surface of the resin layer is reduced in the lighting device
Data Source
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AI summary
A lighting device disclosed in an embodiment of the invention includes a substrate; a reflective member disposed on the substrate; a plurality of light emitting devices disposed on the substrate; a resin layer disposed on the reflective member; and an optical pattern portion having a plurality of concave portions concavely formed on an upper surface of the resin layer, wherein the plurality of light emitting devices is spaced apart in a first direction in which light is emitted, wherein the optical pattern portion includes a pattern portion in which a width of the concave portions is reduced from a position overlapping a center of each of the plurality of light emitting devices in the first direction, wherein the optical pattern portion includes a pattern portion in which a width of the concave portions is reduced from the center of the optical pattern portion toward both sides of a second direction.