Optical Film Partially Coated Prism Array Directional Light Control
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Solution Overview
Problem
Conventional optical films with prism arrays are inadequate for directional light source devices, three-dimensional displays, and holograms, as they lack directional control over light transmission and can cause nausea due to periodic changes in left and right eye images.
Innovation Solution
An optical film with an array of structures on a substrate, where a material with different refractive index, absorbancy, or reflectivity is partially coated, allowing for asymmetric light collection and transmission depending on the direction, enabling applications in displays and three-dimensional imaging without the need for special glasses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional prism array optical film is used to enhance brightness, then axial lighting is increased, but side angle viewing is blocked and symmetry is lost
Solution Approach 1:
The patent applies local quality by coating different regions of the prism array with materials having different optical properties. Specifically, some prisms are coated with a first material while others are coated with a second material, creating spatially varying optical characteristics that enable both axial brightness enhancement and selective side angle viewing control
Solution Approach 2:
The patent introduces asymmetry by using non-uniform coating distributions across the prism array. The asymmetric coating pattern allows the optical film to provide enhanced axial lighting while selectively blocking or allowing side angle viewing in specific directions, breaking the symmetry of conventional prism films
2Adaptability or versatility
If periodic coating patterns are used to create three-dimensional display effects, then left and right eye images are separated, but nausea occurs due to periodic changes in images
Solution Approach 1:
The patent applies local quality by assigning different coating materials to different spatial regions corresponding to different viewing angles. This creates distinct optical paths for left and right eye images without periodic variations, allowing three-dimensional display while avoiding the nausea caused by temporal periodic changes in conventional autostereoscopic displays
3Adaptability or versatility
If complex coating processes are used to achieve directional light control, then asymmetric light transmission is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the prism array into distinct regions and applying different coating materials to each segment. This modular approach enables directional light control through simple geometric segmentation rather than complex continuous patterns, reducing manufacturing difficulty while achieving the desired asymmetric light transmission
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 optical film provides directional control over light, allowing for asymmetric light transmission and three-dimensional image rendering without causing nausea, simplifying manufacturing and improving user experience in displays and light source devices.
Implementation Method 1
a material having different refractive index, absorbancy or reflectivity from that of a surface of the structures is partially coated
Implementation Method 2
a material having different refractive index, absorbancy or reflectivity from that of a surface of the structures is partially coated
Implementation Method 3
a material having different refractive index, absorbancy or reflectivity from that of a surface of the structures is partially coated
Data Source
AI summary
The present invention relates to an optical film comprising a substrate on which an array of structures is formed, wherein a material having a different refractive index, absorbancy or reflectivity from that of a surface of the structures is partially coated on the surface of the structures, and a manufacturing method thereof. Specifically, the optical film according to one embodiment of the present invention may have a different transparency depending on the direction or can transmit light asymmetrically. Further, the optical film may be applicable to image devices, which need to change brightness or images depending on the angle of view or to display three-dimensional images.