Projection Screen Diffusion Film for Vertical Reflection Control
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Solution Overview
Problem
Existing projection screens require multiple scattering layers, leading to complex production processes and unwanted image reflections on surfaces other than the screen.
Innovation Solution
A projection screen with a light diffusion control film having a specific incident light diffusion angle region and haze value, installed vertically, to suppress unwanted reflections and enhance image visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple scattering layers are used to control light diffusion, then unwanted image reflections are suppressed, but production process complexity increases
Solution Approach 1:
The patent combines the functions of multiple scattering layers into a single integrated light diffusion control film. This film simultaneously achieves light diffusion and anisotropy control without requiring separate first and second scattering layers, thereby suppressing unwanted reflections while simplifying the production process.
Solution Approach 2:
The light diffusion control film performs multiple functions: it diffuses light, controls the diffusion angle, provides anisotropy for vertical installation, and suppresses unwanted reflections. This multi-functional design eliminates the need for separate components and reduces production complexity.
2Object-affected harmful factors
If light diffusion angle is increased to suppress reflections, then unwanted reflections are reduced, but image luminance decreases
Solution Approach 1:
The patent precisely controls the diffusion angle parameter within the range of 0° to 60° from the normal direction. This optimized parameter range suppresses unwanted reflections while maintaining sufficient image luminance, achieving a balance between reflection suppression and brightness preservation.
Solution Approach 2:
The light diffusion control film exhibits different diffusion characteristics at different angles. The film provides strong diffusion for vertical installations (suppressing reflections) while maintaining higher transmission for horizontal viewing angles (preserving luminance), creating local quality variations that satisfy both requirements.
3Object-affected harmful factors
If haze value is increased to improve diffusion, then unwanted reflections are suppressed, but background visibility decreases
Solution Approach 1:
The patent specifies a haze value within the range of 1% to 80% at the front face 0°, which optimizes the balance between diffusion and background visibility. This parameter control ensures that unwanted reflections are suppressed while maintaining adequate background visibility during projector operation.
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 effectively reduces unwanted reflections and enhances image luminance and background visibility, while maintaining high transmission gain and total luminous transmittance.
Implementation Method 1
a light diffusion control film having an incident light diffusion angle region, wherein when the projection screen is installed vertically to a ground surface, the incident light diffusion angle region in an up-down direction does not include a front face 0° in a horizontal direction with respect to the ground surface
Implementation Method 2
the incident light diffusion angle region in an up-down direction does not include a front face 0° in a horizontal direction with respect to the ground surface
Data Source
AI summary
Projection screen (1) includes a light diffusion control film (10) having an incident light diffusion angle region. When the projection screen (1) is installed vertically to the ground surface, the incident light diffusion angle region in an up-down direction does not include a front face 0° in the horizontal direction with respect to the ground surface, and the haze value at the above front face 0° is 1% or more and 80% or less. According to the projection screen (1), it is possible to suppress unwanted reflection of images projected from a projector onto those other than the projection screen.