Light Guiding Plate With Scattering Imperfections For Gaussian Dispersion
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Solution Overview
Problem
Current lighting systems using light guides struggle to efficiently direct and tailor LED light, particularly in achieving uniform illumination and Gaussian dispersion, due to limitations in light extraction and distribution.
Innovation Solution
A light guiding plate (LGP) made of transparent material with a side surface for light entry, a concave top surface featuring light-scattering imperfections for downward reflection, and a concave bottom surface for light exit, configured to achieve Gaussian dispersion through injection molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light guides are made with smooth surfaces and standard extraction features, then light can be transported through the guide, but the light extraction efficiency and uniformity are insufficient
Solution Approach 1:
The patent applies local quality by introducing light-scattering imperfections specifically on the top surface of the light guiding plate, while keeping other surfaces smooth. This localized modification creates specific extraction points for light without compromising the overall structural integrity and optical performance of the guide.
Solution Approach 2:
The patent utilizes a porous or imperfect surface structure on the top surface of the light guiding plate. These light-scattering imperfections act as extraction features that allow light to escape from the guide in a controlled manner, improving light extraction efficiency without requiring complex additional components.
2Loss of energy
If light guides use complex extraction features like paint dots or textures, then light extraction is improved, but the device complexity increases
Solution Approach 1:
The patent merges the light extraction function directly into the light guiding plate structure itself by forming light-scattering imperfections on its surface. This eliminates the need for separate extraction features like paint dots or additional texturing components, thereby reducing device complexity while maintaining effective light extraction.
Solution Approach 2:
The light guiding plate serves multiple functions: it guides light through total internal reflection and simultaneously extracts light through its light-scattering imperfections. This multi-functionality reduces the need for additional specialized components, simplifying the overall device structure.
3Illumination intensity
If light guides are designed to homogenize light through multiple reflections, then illumination uniformity is improved, but the length of the guide increases
Solution Approach 1:
The patent transitions from relying solely on longitudinal reflections (one-dimensional homogenization) to incorporating surface-based light scattering (adding a second dimension). The light-scattering imperfections on the top surface create additional light extraction paths that contribute to homogenization without requiring the light to travel through an extended guide length.
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 LGP effectively directs and distributes light, enhancing uniformity and efficiency in illumination by scattering light within the plate to achieve desired Gaussian dispersion patterns, while also optimizing material usage and manufacturing processes.
Implementation Method 1
Light that is injected into the light guide within the correct range of angles becomes trapped inside the guide because of a phenomenon called total internal reflection, or TIR
Implementation Method 2
a top surface that is concave and has light-scattering imperfections and is configured to reflect light in the LGP downward
Data Source
AI summary
A light guiding plate (LGP) made of transparent material. The LGP has a side surface configured to enable light to enter the LGP. A top surface of the LGP has light-scattering imperfections and is configured to reflect light in the LGP downward. A bottom surface of the LGP is concave and configured to enable light in the LGP to leave the LGP.