Taillight Optical Patterning for Wider LED Light Distribution
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Solution Overview
Problem
Light emitting diodes (LEDs) used in vehicle lamps have a narrow directivity angle, necessitating a solution to increase the light emitting area for improved illumination.
Innovation Solution
A lighting device comprising a substrate, reflective member, resin layer with optical pattern portions, and light emitting devices, where the optical pattern portions on the resin layer include concave and convex structures to refract and diffuse light, enhancing light distribution and efficiency.
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 directivity angle of emitted light becomes narrow
Solution Approach 1:
The resin layer is divided into multiple optical pattern portions, each with specific concave-convex structures. These segmented patterns work together to collectively expand the light emission angle while maintaining the energy efficiency of individual LED sources.
Solution Approach 2:
The patent introduces vertical dimension features through concave-convex structures on the resin layer surface. This three-dimensional optical patterning modifies light propagation paths, effectively expanding the directivity angle without compromising the low power consumption characteristic of LEDs.
2Illumination intensity
If the light emitting area is increased to improve illumination, then the directivity angle expands, but the module thickness increases
Solution Approach 1:
The optical pattern portions incorporate curved concave-convex surfaces that refract and reflect light efficiently. These curved structures achieve effective light distribution and area expansion within a compact vertical space, preventing module thickness from increasing proportionally with the light emitting area.
Solution Approach 2:
The resin layer with optical patterns acts as an intermediary between the LED light source and the external environment. This intermediary structure modifies and redirects light paths, effectively increasing the illuminated area without requiring a proportional increase in module thickness.
3Illumination intensity
If optical pattern portions are added to the resin layer, then light distribution is improved, but device complexity increases
Solution Approach 1:
The optical pattern portions are integrated directly into the resin layer, merging the optical guiding function with the structural matrix. This consolidation achieves improved light distribution without adding separate complex optical components, thereby limiting the increase in device complexity.
Solution Approach 2:
The resin layer serves multiple functions: it provides structural support, protects the LED, and contains the optical pattern portions for light distribution. This multi-functionality reduces the need for additional dedicated components, offsetting the complexity introduced by the optical patterns.
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 achieves improved light distribution and increased light emission, providing directionality and a thinner module design while reducing hot spots and enhancing reliability.
Implementation Method 1
an optical pattern portion having a plurality of concave portions formed concavely on an upper surface of the resin layer
Data Source
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.