Microprism Diffusers for Uniform 2D Batwing Illumination
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Solution Overview
Problem
Existing lighting systems struggle to achieve uniform illumination of large areas using Lambertian light sources, leading to hot spots and inefficient energy use, and existing solutions for batwing distributions are costly, complex, or inefficient.
Innovation Solution
A light transmissive structure with microprism elements on a substrate that converts Lambertian light distribution into a 2D batwing distribution, using microprisms and optional diffusion features to achieve uniform illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If Lambertian light distribution is used, then the light source structure is simple, but the illumination uniformity deteriorates with hot spots appearing
Solution Approach 1:
A microprism array is introduced as an intermediary optical element between the Lambertian light source and the illuminated surface. The microprisms refract and redirect light rays to achieve uniform illumination distribution while maintaining the simplicity of the original Lambertian light source structure.
Solution Approach 2:
The patent changes the optical parameters of light propagation by using microprisms with specific refractive indices and geometric configurations. By adjusting prism angles, heights, and spacing, the light distribution pattern is transformed from Lambertian to uniform without changing the light source itself.
2Illumination intensity
If conventional batwing distribution solutions are used, then illumination uniformity is improved, but the device complexity and cost increase
Solution Approach 1:
The patent uses a simple microprism array that can be manufactured using conventional low-cost techniques such as injection molding or embossing. This replaces complex and expensive optical systems while achieving the desired batwing light distribution pattern.
Solution Approach 2:
By carefully selecting microprism geometric parameters (angles, heights, spacing) and material refractive indices, the patent achieves batwing distribution through simple refractive optics rather than complex reflective or multi-element optical systems.
3Device complexity
If Lambertian distribution is used, then fewer optical elements are needed, but energy efficiency deteriorates due to hot spots
Solution Approach 1:
The microprism array serves as an efficient intermediary that redistributes light energy uniformly across the target surface. This eliminates hot spots and ensures that all emitted light contributes usefully to illumination, maximizing energy efficiency with minimal additional optical elements.
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 efficient and cost-effective uniform illumination across large areas by reducing hot spots and minimizing energy waste, while maintaining a desirable lighting pattern.
Implementation Method 1
A light transmissive structure with microprism elements on a substrate that converts Lambertian light distribution into a 2D batwing distribution
Data Source
Figure 1~2
Figure 3A~3B
Figure 4
AI summary
A light transmissive structure includes a light transmissive substrate having first and second opposing faces and array of microprism elements on the first face. A respective microprism element includes at least one ring comprising a plurality of microstructure pyramids that is rotated randomly and/or pseudorandomly on the first face about an axis that is orthogonal to the substrate relative to at least one other microprism element. The light transmissive structure is configured to receive light from a light source facing the first face and distribute the light emerging from the second face in a 2D batwing distribution.