Half-Mirror LED Lamp Structure for Uniform Surface Lighting
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Solution Overview
Problem
Lighting devices using LEDs face challenges in achieving uniform light distribution and heat dissipation, leading to reduced performance and aesthetics, especially in applications like vehicle lamps where the LED itself can be visually recognizable and prone to hot spots.
Innovation Solution
A lighting device design incorporating a reflective layer, resin layers, a substrate, a half mirror layer, and an optical member that directs light emission to create a uniform line or surface light source, while also improving heat dissipation through an electrode layer and minimizing the visibility of the LED by using a light blocking layer and a half mirror layer with specific transmittance and reflectance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a light emitting diode is used as a light source, then power consumption is reduced and lifespan is extended, but the emission angle of emitted light is relatively small and uniformity of emitted light is reduced due to heat generation
Solution Approach 1:
The patent divides the lighting system into multiple LED chips arranged in a specific pattern, rather than using a single LED. This segmentation allows the light from multiple sources to combine and create a more uniform illumination pattern, reducing the hot spot effect while maintaining the energy efficiency and long lifespan benefits of individual LED chips.
Solution Approach 2:
The patent employs a reflective layer with specific reflectance characteristics positioned beneath the LED chips. This layer is designed to reflect light in specific wavelength bands back through the substrate, creating localized enhancement of light uniformity in areas where LEDs are mounted, while maintaining the overall benefits of LED technology.
2Illumination intensity
If the light emitting diode is made visible from the outside, then the aesthetics of the lamp is improved, but the light emitting diode can be visually recognized when the lamp is turned off
Solution Approach 1:
The patent utilizes a half-mirror layer with specific optical properties that allows it to appear reflective or transparent depending on lighting conditions. When the lamp is off, the half-mirror layer reflects ambient light, making the LED chips invisible. When the lamp is on, the emitted light passes through the half-mirror layer, making the lighting effect visible while the LED chips themselves remain imperceptible.
3Area of stationary object
If a linear light source or surface light source is implemented, then the light emitting area is increased, but hot spots are formed and uniformity characteristics are deteriorated
Solution Approach 1:
The patent uses multiple small LED chips distributed across the substrate surface rather than a single large light source. This segmentation creates multiple small emission points whose combined effect produces a uniform large-area illumination without the hot spot problems associated with concentrated light sources.
Solution Approach 2:
The patent introduces a reflective layer as an intermediary between the LED chips and the viewing area. This layer with specific reflectance properties redistributes the light from the LED chips, creating a uniform appearance across the entire light emitting area while eliminating hot spots.
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 solution provides improved light uniformity, reduced hot spots, enhanced heat dissipation, and improved aesthetics by ensuring the lighting device emits light in a way that the LED is not directly visible, maintaining design freedom and reliability.
Implementation Method 1
light emitted through a light emitting surface of the light emitting device is reflected by the reflective layer and passes through the substrate
Implementation Method 2
the half mirror layer may have a higher reflectance of light in the first wavelength band than the light in the first wavelength band
Implementation Method 3
the optical member may have a higher transmittance of light in the first wavelength band than the light in the second wavelength band
Data Source
AI summary
A lighting device disclosed in an embodiment of the invention includes a reflective layer, a first resin layer on the reflective layer, a substrate on the first resin layer, a light emitting device between the first resin layer and the substrate, and a second resin layer on the substrate, a half mirror layer on the second resin layer and an optical member between the second resin layer and the half mirror layer, and the light emitted through the light emitting surface of the light emitting device is reflected by the reflective layer and passes through the substrate. The light in the visible light wavelength band includes a first wavelength band and a second wavelength band having different wavelength bands, and the half mirror layer has a reflectance of the light in the first wavelength band of the first wavelength band higher than a transmittance of light in the first wavelength band, and the optical member has a transmittance of light in the first wavelength band higher than a transmittance of light in the second wavelength band.