Pyramid Reflector Slope Angles for Vehicle Illumination Efficiency
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Solution Overview
Problem
Conventional backlights in vehicles have low illumination efficiency due to the inadequate use of reflected light by the reflector, resulting in insufficient luminance.
Innovation Solution
The illumination structure features a reflector with a regular pyramid-like shape and steep slope parts on its inside surfaces, angled between 7.5 and 15 degrees relative to the light source's optical axis, to enhance light reflection and distribution, along with a diffuser plate and mirror reflection layer to optimize luminance and reduce unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional reflector is used to surround the light source, then the light source is protected and structurally supported, but the illumination efficiency is low and sufficient luminance cannot be obtained
Solution Approach 1:
The reflector's inside surface is designed with a specific slope angle parameter (7.5° to 15° relative to the optical axis) to optimize light reflection. This parameter change transforms the conventional reflector into an efficient light-guiding structure that directs reflected light toward the display part, resolving the contradiction between luminance output and illumination efficiency
Solution Approach 2:
The reflector is divided into functional zones: a reflection wall part with steep slope parts for directing light, and a base part for structural support. This local differentiation allows the reflector to simultaneously achieve high illumination efficiency through optimized light reflection while maintaining structural integrity
2Loss of energy
If the reflector uses steep slope parts with specific angles, then light reflection efficiency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
A specific angle range (7.5° to 15°) is established for the slope parts, providing an optimized parameter that achieves high reflection efficiency while being manufacturable. This parameter specification balances optical performance with manufacturing feasibility, reducing the precision burden compared to more extreme angle designs
3Illumination intensity
If more light sources are added to increase luminance, then the illumination intensity is improved, but the device complexity and cost increase
Solution Approach 1:
The reflector structure with steep slope parts actively directs and concentrates light from existing sources toward the display part, making the system self-optimizing for luminance output. This passive optical design eliminates the need for additional light sources or complex active control systems, reducing device complexity while maintaining high illumination intensity
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
This configuration significantly improves luminance while minimizing unevenness, enhancing illumination efficiency and reducing the number of light sources required, thereby lowering costs and improving the overall lighting performance.
Implementation Method 1
a reflector arranged on the front surface of the substrate to surround the light source... the reflector includes a reflection wall part having a regular pyramid-like shape, and four inside surfaces of the reflection wall part having the regular pyramid-like shape include steep slope parts
Data Source
AI summary
An illumination structure includes a substrate having a front surface on which a light source is attached, and a reflector arranged on the front surface of the substrate to surround the light source, wherein the reflector includes a reflection wall part having a regular pyramid-like shape, and four inside surfaces of the reflection wall part having the regular pyramid-like shape include steep slope parts, respectively, having an angle larger than 7.5 degrees and smaller than 15 degrees with respect to a direction of an optical axis of the light source as a standard.