Flexible Light Guide Film with Lenticular Microstructures
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Solution Overview
Problem
Conventional light guide plates in edge-lit backlight modules require high energy consumption for acceptable brightness, are difficult to manufacture, and struggle to produce thin and flexible structures necessary for modern LCD devices, especially for large sizes.
Innovation Solution
A thin, flexible light guide film with a lenticular-like microstructure on the bottom side and a prismatic-like microstructure on the top side, fabricated using a roll-to-roll coating/embossing process, which reduces thickness and manufacturing costs while improving light guidance and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light guide plates with total internal reflection structures are used, then light can be guided from edge source to planar surface, but high energy consumption is required to achieve acceptable brightness
Solution Approach 1:
The patent changes the optical parameters by introducing a light-adjusting structure with specific refractive index differences and geometric configurations (lenticular or prismatic microstructures) that modify light propagation paths. This enables more efficient light distribution across the planar surface, achieving acceptable brightness at lower energy consumption levels compared to conventional total internal reflection structures.
Solution Approach 2:
The patent applies local quality by incorporating light-adjusting structures at specific locations (bottom surface or top surface) of the light guide plate. These localized microstructures (lenticular lenses or prisms) are strategically positioned to optimize light extraction and distribution in critical areas, improving overall brightness efficiency without requiring uniform structural modifications throughout the entire plate.
2Illumination intensity
If V-cut light guide plates with micro-fabricated prisms are used, then brightness is enhanced by nearly 30%, but manufacturing becomes difficult and costly with high failure rates
Solution Approach 1:
The patent employs copying by using mold-based fabrication processes to replicate light-adjusting structures (lenticular or prismatic microstructures) across the light guide plate surface. Instead of complex micro-fabrication techniques, standard molding methods are used to create replicated patterns, significantly simplifying the manufacturing process and reducing failure rates while maintaining the brightness enhancement benefits.
Solution Approach 2:
The patent modifies the manufacturing approach by changing the fabrication parameters from complex micro-fabrication to conventional molding techniques. This parameter change in the manufacturing process enables easier production of light-adjusting structures with high brightness performance, resolving the contradiction between performance improvement and manufacturing difficulty.
3Shape
If thin and flexible light guide structures are required for modern LCD devices, then device flexibility is improved, but manufacturing precision and yield become more difficult to maintain
Solution Approach 1:
The patent applies flexible shells and thin films by using thin light guide plate materials (e.g., PMMA or other transparent polymers) with integrated light-adjusting structures. The flexible substrate design allows the light guide to be bent or conformal to display surfaces while maintaining optical functionality. The molding process is adapted to accommodate thin geometries, preserving manufacturing precision despite the reduced thickness and increased flexibility.
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 flexible light guide film enhances luminance and brightness uniformity, reduces energy consumption, and simplifies manufacturing, making it easier to produce thin and flexible structures for LCDs.
Implementation Method 1
The light from the light source is guided to propagate through the light guide plate to an opposite edge surface of the light guide plate
Implementation Method 2
conventional light guide plates incorporated in edge-lit backlight modules utilize total internal reflection to direct light from a light source positioned at an edge surface
Data Source
AI summary
A flexible light guide film having a light-adjusting structure in the form of a lenticular-like microstructure on the bottom side of the light guide film. The light guide film has a substrate layer supporting a layer light-adjusting structure, which is in the form of an array of longitudinal lenticular lenses laterally arranged in parallel. A prismatic-like microstructure may be provided on the top light emitting side of the light guide film. The light guide film is fabricated by a process involving coating/embossing of a roll of sheet material, in a roll-to-roll continuous process. Advantages includes significantly reducing the thickness of the light guide film, and the roll-to-roll fabrication process provides for more precise replication of the microstructures on the master mold or drum onto the surface of the light guide film, which in turn reduces the failure rate and manufacturing cost.