Light Guiding Film With Micro Concave Lens Array
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Solution Overview
Problem
Existing light guiding films struggle to efficiently direct light into thin films, especially when using LEDs, as the light beams converge and require complex methods to couple light into the film, often resulting in energy loss and increased costs.
Innovation Solution
A light guiding film with a micro concave lens structure arranged in a two-dimensional array on its surface, combined with a reflective element, allows light to be refracted and propagate through total reflection, enabling efficient light entry and propagation even in thin films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the light guiding film thickness is reduced to less than 500 μm, then the film achieves extra-thin profile, but light cannot be effectively directed into the film from edges
Solution Approach 1:
The patent transitions from edge-based light coupling (one-dimensional approach) to surface-based light coupling using a micro lens array. The micro lenses are arranged in a two-dimensional array on the film surface, allowing light to enter from the surface rather than the edge, effectively solving the thickness limitation problem.
Solution Approach 2:
The light guiding film surface is segmented into multiple micro lens units arranged in an array. Each micro lens acts as an independent light coupling element, collectively enabling efficient light entry across the entire film surface. This segmentation allows the thin film to effectively capture and guide light without requiring thick edges for coupling.
2Use of energy by moving object
If conventional light coupling methods are used for thin films, then light can enter the film, but the structure becomes complicated and energy loss increases
Solution Approach 1:
The patent combines the light diffusion function and light coupling function into a single integrated micro lens array structure on the film surface. This merging eliminates the need for separate coupling components and reflective layers, reducing structural complexity while maintaining high light energy efficiency through direct surface coupling.
Solution Approach 2:
The micro lens array on the film surface performs self-coupling of light. The lenses are formed directly on the film, allowing the film itself to capture and guide light without requiring external coupling structures. This self-service approach simplifies the overall system and reduces energy loss associated with multiple interfaces and components.
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 film effectively directs light into thin films with high efficiency, maintaining light intensity and reducing the complexity and cost associated with existing methods, while ensuring continuous total reflection for perpendicular propagation.
Implementation Method 1
Light from a light source passes through the light diffusion structure, is refracted into the main body
Implementation Method 2
propagates in the main body by total reflection
Implementation Method 3
the light is reflected by the reflective element to pass through the light diffusion structure
Data Source
AI summary
A light guiding film is provided including a main body, and a light diffusion structure comprising a plurality of micro concave lenses arranged in a first direction and a second direction to form a second dimensional array and the curvature of each concave lens and the junction of the concave lenses are different from zero. Light from a light source passes through the light diffusion structure and is refracted into the main body and then propagates in the main body by total reflection.