Curved Diffusion Sheet for Homogeneous LED Vehicle Lamps
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Solution Overview
Problem
Existing systems for controlling light output from multiple LEDs in automotive vehicle lamps often require complex lens systems to achieve uniform light distribution, leading to issues like non-contiguous appearance and shadowing.
Innovation Solution
A homogenous LED lamp design featuring a plurality of LEDs arranged in an array with a diffusion sheet having a curvature aligned with the LED array, which smooths and bends light to create a uniform lighting appearance without hotspots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If complex lens systems are used to control light output from multiple LEDs, then uniform light distribution is achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent removes the complex inner lens system from the optical design. Instead of using multiple lenses to control light distribution, the invention extracts the light control function to a diffusion sheet with a specific curvature profile, simplifying the overall device structure while maintaining uniform light output.
Solution Approach 2:
The patent introduces a diffusion sheet as an intermediary element between the LED array and the outer lens. This diffusion sheet with a specific curvature profile acts as a mediator that redistributes light uniformly, replacing the need for complex inner lens systems while achieving the desired illumination uniformity.
2Illumination intensity
If complex lens systems are used to achieve uniform light distribution, then hotspots are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent eliminates the need for precise lens alignment by removing the inner lens system entirely. The light control function is extracted and implemented through a diffusion sheet with a predetermined curvature profile, which inherently provides uniform light distribution without requiring high-precision assembly.
Solution Approach 2:
The patent changes the approach from geometric optical control (lenses) to diffusive optical control. By modifying the curvature parameter of the diffusion sheet, the system achieves uniform light distribution and hotspot reduction without the manufacturing precision requirements associated with lens alignment.
3Area of stationary object
If multiple LEDs are positioned close together to form a compact array, then lamp size is reduced, but light uniformity deteriorates due to increased hotspot formation
Solution Approach 1:
The patent introduces a diffusion sheet with a specific curvature profile as an intermediary between the compact LED array and the output. This diffusion sheet redistributes the light from closely-spaced LEDs, eliminating hotspots and achieving uniform light distribution while maintaining the compact lamp size enabled by close LED positioning.
Solution Approach 2:
The patent employs a diffusion sheet with a specific curvature profile to address the uniformity issue. The curved surface of the diffusion sheet redistributes light from the compact LED array, transforming the non-uniform light pattern into a uniform output while allowing the LEDs to be positioned close together for compactness.
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 a uniform and homogenous LED light output that meets output angle requirements without the need for complex inner lenses, ensuring a consistent and efficient lighting appearance.
Implementation Method 1
A diffusion sheet is provided that has a curvature aligned with the LED array for smoothing and bending light emitted by the plurality of LEDs
Data Source
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AI summary
A homogenous light-emitting diode (LED) lamp for an automotive vehicle is provided that includes multiple LEDs configured as a LED array and a diffusion sheet. The diffusion sheet has a curvature aligned with the LED array for smoothing and bending light emitted by the LEDs for the purpose of creating a lighting appearance substantially lacking hotspots. An automotive vehicle lamp for producing homogenous light is provided. The vehicle lamp includes multiple LEDs each positioned a first distance apart from one another to form an array of LEDs, and a diffusion sheet positioned a second distance from the array of LEDs for smoothing light emitted from the array of LEDs. The first distance and the second distance are arranged for the purpose of providing a substantially homogenous light output from the vehicle lamp when viewed through the diffusion sheet.