Projection Screen Anti-Reflection Coating for Brightness Uniformity
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Solution Overview
Problem
Rear and front projection display systems suffer from non-uniform brightness due to energy loss caused by reflection on the projection screens, particularly at higher incidence angles, leading to poorer image quality.
Innovation Solution
An anti-reflection coating is applied to the light incidence side surface of the projection screen in areas with high incidence angles, specifically arranged in sub-target areas to enhance transmittivity and reduce reflection, using materials like Magnesium Fluoride, Titania, or Zinc Selenide, to improve light uniformity across the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If no anti-reflection coating is applied, then the projection screen structure remains simple and manufacturing cost is low, but light reflection causes non-uniform brightness and poor image quality
Solution Approach 1:
The patent applies anti-reflection coating specifically to the light incidence side surface of the projection screen where the problem occurs, rather than modifying the entire screen structure. This localized application reduces light reflection loss at the critical interface while keeping the overall screen structure simple and manufacturing processes straightforward.
Solution Approach 2:
The patent uses composite material structure by combining the projection screen base material with an anti-reflection coating layer. This composite approach reduces light reflection loss by creating an optical gradient that minimizes impedance mismatch between air and the screen material, thereby improving brightness uniformity without significant structural complexity.
2Illumination intensity
If anti-reflection coating is applied to the entire screen, then light transmittivity improves uniformly, but manufacturing complexity and cost increase
Solution Approach 1:
The patent applies anti-reflection coating specifically to the light incidence side surface of the projection screen, which is the local area where reflection problems occur most severely. This targeted approach improves brightness uniformity in the critical viewing area while avoiding the need to coat the entire screen, thereby reducing manufacturing complexity and material costs.
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 anti-reflection coating significantly reduces light reflection and enhances transmittivity in target areas, resulting in more uniform brightness and improved image quality by minimizing the difference in brightness from the center to the edge of the projection screen.
Implementation Method 1
an anti-reflection coating arranged in a target area on a light incidence side surface of the projection screen to increase transmittivity in the target area
Data Source
AI summary
This disclosure relates to the field of projection display technology, and particularly to a projection screen and a projection display system so as to improve the uniformity of brightness throughout the projection screen. There is an anti-reflection coating arranged in a target area on a light incidence side surface of the projection screen to increase transmittivity in the target area, where the target area refers to an area where an incidence angle of projected light beams on the projection screen is above an angle threshold, and the projected light beams are light beams emitted by a projector.