Vehicle Lamp Optical Stack for Uniform LED Surface Emission
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Solution Overview
Problem
Conventional light emitting diodes (LEDs) used in vehicle lamps suffer from limited light emission area, hot spot formation, and visibility issues, which affect the uniformity and aesthetics of the lighting device.
Innovation Solution
A lighting device design incorporating a reflective layer, resin layers, light blocking layers, and a half mirror layer to redirect light emission, enhance heat dissipation, and improve design aesthetics by minimizing direct visibility of the LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If light emitting diodes are used as vehicle lamps, then low power consumption and long lifespan are achieved, but the light emitting area is limited and hot spots are formed
Solution Approach 1:
The patent transforms the point-source light emission of conventional LEDs into a distributed line or surface light source by arranging multiple LEDs in specific patterns and using light guiding structures. This dimensional transformation increases the effective light emitting area while maintaining the energy efficiency and lifespan advantages of LED technology.
Solution Approach 2:
The patent divides the lighting system into multiple separate LED units arranged in arrays rather than using a single LED. This segmentation allows the light to be distributed across a larger area, reducing hot spot formation while maintaining the durability and low power consumption of individual LED components.
2Use of energy by moving object
If light emitting diodes are used as vehicle lamps, then low power consumption and long lifespan are achieved, but hot spots are formed deteriorating uniformity characteristics
Solution Approach 1:
The patent employs light blocking layers with specific patterns (such as mesh or grid structures) positioned between the LEDs and the light guiding layer. These local modifications to the light path distribution enable uniform light emission across the entire surface while maintaining the energy efficiency of individual LED elements.
Solution Approach 2:
The patent introduces light blocking layers and light guiding layers as intermediary structures between the LED array and the external environment. These intermediaries redistribute the light from multiple point sources into a uniform surface emission, eliminating hot spots while preserving the low power consumption characteristics of LEDs.
3Use of energy by moving object
If light emitting diodes are applied to vehicle lamps, then low power consumption is achieved, but the light emitting diode is visually recognized from the outside deteriorating aesthetics
Solution Approach 1:
The patent transitions from visible point-source LED emission to a diffuse surface light source that appears as a continuous uniform illumination. This dimensional transformation hides the individual LED structures and their supporting components from external view, achieving aesthetic goals while maintaining LED energy efficiency.
Solution Approach 2:
The patent extracts and conceals the visible LED components (such as the LED chips and their mounting structures) behind light blocking layers and light guiding structures. Only the desired light output is visible from the exterior, creating a clean aesthetic appearance while the concealed LEDs continue to provide low power consumption benefits.
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 achieves a uniform line or surface light source with improved luminance, reduced hot spots, and enhanced heat dissipation, while maintaining design flexibility and aesthetics by redirecting light emission and concealing the LEDs when off.
Implementation Method 1
a reflective layer, a resin layer disposed on the reflective layer
Implementation Method 2
a light blocking layer disposed on the substrate, the electrode layer may include a first pattern region disposed adjacent to the light emitting device and a second pattern region disposed outside the first pattern region
Data Source
AI summary
A lighting device disclosed in an embodiment of this invention includes a reflective layer, a resin layer disposed on the reflective layer, a substrate disposed on the resin layer and including an electrode layer, a plurality of light emitting devices disposed between the resin layer and the substrate, and a light blocking layer disposed on the substrate, the electrode layer may include a first pattern region disposed adjacent to the light emitting device and a second pattern region disposed outside the first pattern region and having a pattern different in size from the first pattern region, and the light blocking pattern region may overlap in a vertical direction with the first pattern region.