Visual Angle Control Film With Microstructure and Reflective Absorption
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Solution Overview
Problem
Existing visual angle control films suffer from low light transmittance, poor visual angle controllability, and high manufacturing costs, with previous solutions either compromising light utilization, visual effects, or being difficult to produce.
Innovation Solution
A visual angle control film design comprising a transparent structure layer with a light-emitting plane and light-entering micro-structure surface, filled with an absorption material and coated with a reflection layer, where the refractive indices of the materials are carefully selected to enhance light utilization and control, combined with a protective and optical coating to optimize transmittance and angle control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an absorption layer is used to control visual angle, then visual angle controllability is improved, but light transmittance decreases and screen brightness is reduced
Solution Approach 1:
The film is divided into multiple functional layers: transparent structure layer, light control coating, absorption material, and reflection layer. Each layer performs a specific function - the transparent structure and light control coating manage light direction through refraction and total reflection, while the absorption material selectively absorbs stray light. This segmentation allows the system to control visual angle without significantly reducing overall light transmittance and screen brightness.
Solution Approach 2:
The absorption material is strategically positioned in specific regions where stray light needs to be controlled, rather than uniformly across the entire film. The light control coating is applied selectively on the light-entering micro-structure surface. This localized application ensures that light absorption and angle control occur only where necessary, preserving overall light transmittance and screen brightness in areas where control is not needed.
2Loss of energy
If total reflection is used to increase light utilization, then light utilization rate is improved, but manufacturing complexity increases
Solution Approach 1:
The transparent structure layer with its light-entering micro-structure surface automatically guides light through total reflection at the interfaces between layers with different refractive indices. The structure itself creates the total reflection effect without requiring additional complex optical components or precise alignment mechanisms, simplifying manufacturing while maintaining high light utilization.
Solution Approach 2:
The film combines multiple materials with different refractive indices (transparent structure material, light control coating material, absorption material, reflection layer) to create total reflection at their interfaces. This composite structure achieves high light utilization through material properties rather than complex geometric designs, reducing manufacturing complexity.
3Illumination intensity
If high refractive index coating is used to control light angle, then transmittance is improved, but material cost increases
Solution Approach 1:
The light control function is divided between the transparent structure layer, light control coating, and reflection layer, each contributing to overall transmittance through different mechanisms. This segmentation allows the use of more cost-effective materials in each layer rather than requiring expensive high refractive index materials throughout the entire film structure.
Solution Approach 2:
The light control coating with specific refractive index properties is applied only on the light-entering micro-structure surface where it is most needed for controlling light entry angles. This localized application reduces the quantity of expensive optical materials required compared to coating the entire film surface, lowering material costs while maintaining transmittance.
4Illumination intensity
If absorption material efficiency is reduced to increase transmittance, then optical transmittance is improved, but visual angle controllability is reduced
Solution Approach 1:
The film is segmented into transparent structure layer, light control coating, absorption material, and reflection layer, each performing distinct functions. The transparent structure and light control coating handle the majority of light transmission through refraction and total reflection, while the absorption material focuses on controlling stray light and defining the visual angle. This functional segmentation allows high optical transmittance while maintaining visual angle controllability.
Solution Approach 2:
The absorption material is positioned locally in regions where stray light control is needed, rather than being uniformly distributed. This localized placement allows the absorption material to maintain its light-absorbing efficiency for angle control while minimizing its impact on overall optical transmittance, as most light passes through the transparent structure and light control coating layers.
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 achieves high full-spectrum visible light transmittance, good visual angle controllability, and increased light utilization, while being cost-effective to produce with high production efficiency.
Implementation Method 1
a recess of the light-entering micro-structure surface is filled with an absorption material
Implementation Method 2
an optical refractive index of the transparent structure layer is nH, an optical refractive index of the light control coating is nL, and the optical refractive index nH of the transparent structure layer and the optical refractive index nL of the light control coating satisfies: nH-nL>0.05
Implementation Method 3
the light angle is controlled by total reflection formed on a surface of a medium
Implementation Method 4
a reflection layer is arranged on an outer surface of the absorption material
Data Source
Figure 1~2
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Figure 5~6
AI summary
A visual angle control film includes a transparent structure layer (200), wherein the transparent structure layer (200) includes a light-emitting plane and a light-entering micro-structure surface, a light control coating (300) is arranged on a surface of the light-entering micro-structure surface, a recess of the light-entering micro-structure surface is filled with an absorption material (400), a reflection layer (500) is arranged on an outer surface of the absorption material (400), an optical refractive index nH of the transparent structure layer (200) and an optical refractive index nL of the light control coating (300) satisfies: nH-nL>0.05.