Projection Screen Light Diffusion Control Plate Louver Columnar Structures
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Solution Overview
Problem
Conventional rear projection screens with light diffusion control films struggle to effectively diffuse incident light from wide angles, leading to narrowed viewing angles and increased complexity and cost when attempting to improve diffusion with more laminated sheets, which results in decreased image sharpness and production efficiency.
Innovation Solution
A projection screen utilizing a light diffusion control plate formed by laminating sheets of a film with a single light diffusion layer having a louver structure for anisotropic diffusion and a columnar structure for isotropic diffusion, allowing effective diffusion of wide-angle light with fewer sheets, such as 3 to 4, while maintaining image sharpness and reducing production complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of laminated sheets of light diffusion control film is increased to effectively diffuse incident light from wide angles, then the light diffusion performance is improved, but the thickness of the laminate increases which decreases image sharpness and produces blurred images
Solution Approach 1:
The patent applies local quality by creating different internal structures (louver structure and columnar structure) within specific regions of the light diffusion control film. The louver structure is positioned in the lower part for anisotropic diffusion while the columnar structure is in the upper part for isotropic diffusion, allowing each region to perform its specific diffusion function optimally without requiring excessive layers
Solution Approach 2:
The patent uses composite materials by combining two different internal structures (louver and columnar) within a single light diffusion control film layer. This composite structure enables the film to achieve both anisotropic and isotropic diffusion characteristics in one integrated component, reducing the need for multiple laminated sheets
2Adaptability or versatility
If the number of laminated sheets of light diffusion control film is increased to diffuse wide-angle light, then the viewing angle is improved, but the production process becomes excessively complicated decreasing production efficiency
Solution Approach 1:
The patent merges the functions of multiple light diffusion control films into a single integrated film by incorporating both louver and columnar structures within one layer. This consolidation reduces the number of laminating steps and simplifies the production process while maintaining wide viewing angle performance
Solution Approach 2:
The patent applies parameter changes by varying the internal structure parameters (louver angle, columnar spacing) within the single film layer to achieve different diffusion characteristics. This allows optimization of viewing angle and image quality without increasing the number of layers, thereby maintaining production efficiency
3Adaptability or versatility
If the number of laminated sheets of light diffusion control film is increased to achieve wide angle diffusion, then the light diffusion coverage is improved, but the cost increases making it economically disadvantageous
Solution Approach 1:
The patent applies local quality by creating different internal structures (louver structure and columnar structure) within specific regions of the light diffusion control film. The louver structure is positioned in the lower part for anisotropic diffusion while the columnar structure is in the upper part for isotropic diffusion, allowing each region to perform its specific diffusion function optimally without requiring excessive layers
Solution Approach 2:
The patent uses composite materials by combining two different internal structures (louver and columnar) within a single light diffusion control film layer. This composite structure enables the film to achieve both anisotropic and isotropic diffusion characteristics in one integrated component, reducing the need for multiple laminated sheets
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 solution enables effective diffusion of wide-angle light, providing a wide viewing angle even on large-sized screens with fewer laminated sheets, enhancing image brightness and production efficiency while maintaining image clarity.
Implementation Method 1
a louver structure formed by alternately arranging a plurality of plate-shaped regions having different refractive indices
Implementation Method 2
the first internal structure is a louver structure for anisotropically diffusing incident light
Implementation Method 3
a columnar structure formed by arranging a plurality of pillar-shaped objects with a relatively high refractive index
Implementation Method 4
the second internal structure is a columnar structure for isotropically diffusing incident light
Implementation Method 5
a light diffusion control plate formed by laminating a plurality of sheets of a light diffusion control film
Implementation Method 6
the first internal structure is a louver structure for anisotropically diffusing incident light
Data Source
AI summary
Provided is a projection screen which can effectively diffuse incident light coming from a wide angle, despite that the number of laminated sheets of a light diffusion control film is small such as 3 to 4 sheets, and can thereby provide a wide viewing angle even if the projection screen is applied to a large-sized screen. Disclosed is a projection screen having a light diffusion control plate, the light diffusion control plate being formed by laminating a plurality of sheets of a light diffusion control film, the light diffusion control film being a light diffusion control film having a single light diffusion layer having a first internal structure and a second internal structure sequentially from the lower part along the film thickness direction, in which the first internal structure is a predetermined louver structure, and the second internal structure is a predetermined columnar structure.