Projection Screen Light Diffusion Control Plate Wide Viewing Angle
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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 a narrow viewing angle and image blurriness, especially when applied to large-sized screens.
Innovation Solution
A projection screen utilizing a light diffusion control plate with a predetermined internal structure, featuring regions of high and low refractive indices, where the luminance of diffused light is optimized across various incident angles, ensuring effective diffusion of light from wide angles in both transverse and vertical directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light diffusion control film with a single louver structure is used, then the film can be manufactured simply, but it cannot sufficiently diffuse incident light from wide angles
Solution Approach 1:
The light diffusion control film is divided into multiple independent louver structures with different inclination angles (first louver structure at first angle, second louver structure at second angle). Each louver structure handles light diffusion in specific angular ranges, collectively achieving comprehensive wide-angle diffusion while maintaining manufacturing simplicity through modular design
Solution Approach 2:
Different regions of the film plane are assigned different louver structure inclination angles tailored to local light incident angle requirements. The first louver structure with first inclination angle addresses light from one angular range, while the second louver structure with second inclination angle addresses light from another range, optimizing light diffusion characteristics for each local region
2Adaptability or versatility
If multiple sheets of light diffusion control film are laminated to increase diffusion angle range, then wider angle coverage is achieved, but the laminate thickness increases causing image blurriness
Solution Approach 1:
Multiple louver structures with different inclination angles are integrated into a single light diffusion control film rather than laminating multiple separate films. This merging approach achieves wide-angle light diffusion coverage while avoiding the cumulative thickness increase that would cause image blurriness, as all diffusion functions are combined in one thin film layer
3Ease of manufacture
If conventional Fresnel lens and lenticular lens are combined, then the screen can be manufactured, but the screen image is not bright enough and moiré patterns are generated
Solution Approach 1:
The conventional mechanical lens systems (Fresnel lens and lenticular lens) are replaced with a light diffusion control film using louver structures. This substitution eliminates the moiré pattern generation inherent in lens-based systems while achieving effective light diffusion through the louver geometry, resulting in brighter screen images without compromising manufacturability
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 a wide viewing angle and maintains image brightness even on large-sized screens by efficiently diffusing incident light across a broad range of angles, preventing image blurriness and moiré patterns.
Implementation Method 1
a light diffusion control film having a louver structure, in which a plurality of plate-shaped regions having different refractive indices are alternately arranged
Data Source
AI summary
Provided is a projection screen that can effectively diffuse incident light coming from a wide range of angles in the transverse direction and the longitudinal direction and can provide a wide viewing angle even if the projection screen is applied to a large-sized screen. Disclosed is a projection screen including a light diffusion control plate, in which when a first direction and a second direction orthogonally intersecting each other are assumed to be on the surface of the light diffusion control plate, and when the incident angle of the light incident to the light diffusion control plate is defined such that an angle parallel to the normal line to the surface of the light diffusion control plate is defined as 0°, in a case in which the luminance of diffused light obtainable when light is incident at an incident angle of 0° is designated as L0; the luminance of diffused light obtainable when light is incident at a predetermined incident angle along the first direction is designated as L1; and the luminance of diffused light obtainable when light is incident at a predetermined incident angle along the second direction is designated as L2, there exist a first direction and a second direction, in which L0, L1, and L2 always satisfy the following relational expressions (1) and (2):L1≥0.25×L0 (1)L2≥0.25×L0 (2).