Projection Screen Fresnel Structures and Protective Layer
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Solution Overview
Problem
Conventional projection screens suffer from poor reliability due to exposed optical microstructures that are prone to damage, contamination, and uneven brightness issues leading to hot spots and poor imaging quality, especially when viewed from different angles.
Innovation Solution
A projection screen design featuring Fresnel structures between a substrate and a protective layer with randomly distributed optical microstructures on the protective layer, which protects the Fresnel structures and scatters the image beam to prevent hot spots, improving imaging quality and providing better anti-glare functionality. The optical microstructures are orthographically projected to form patterns with specific axes, allowing adjustment of scattering angles in different directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If optical microstructures are exposed on the projection screen surface, then the scattering capability is improved, but the reliability deteriorates due to damage and contamination
Solution Approach 1:
The patent embeds the optical microstructures within a protective layer that covers the Fresnel structures. The protective layer acts as an outer shell containing the optical microstructures, allowing light scattering functionality while protecting against damage and contamination. This nesting arrangement resolves the contradiction by hiding the functional elements inside a protective container.
Solution Approach 2:
The protective layer serves as an intermediary between the external environment and the optical microstructures. It mediates the interaction by allowing light to pass through and scatter while blocking physical damage and contamination from reaching the optical microstructures directly.
2Ease of manufacture
If optical microstructures are arranged unidirectionally, then the manufacturing is simplified, but the ease of operation deteriorates due to restricted touch movement
Solution Approach 1:
The patent employs optical microstructures with asymmetric shapes (such as triangular prisms) arranged in a unidirectional pattern. This asymmetric design allows the structures to effectively scatter light while creating gaps or pathways that facilitate smoother touch movement in multiple directions, resolving the conflict between manufacturing simplicity and operational ease.
3Device complexity
If scattering capability is insufficient, then the device complexity is reduced, but the image quality deteriorates due to hot spot phenomenon
Solution Approach 1:
The patent applies optical microstructures with specific local geometric properties (such as triangular cross-sections with particular apex angles) to specific locations on the Fresnel structures. This local optimization of geometric quality enhances light scattering capability in critical areas, preventing hot spots and improving image uniformity without requiring complex overall structural changes.
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 enhances the reliability and imaging quality of the projection screen by protecting the Fresnel structures and reducing hot spots, while the adjustable scattering angles ensure consistent brightness across various viewing angles, improving the overall display quality.
Implementation Method 1
the optical microstructures are orthographically projected on a reference plane to correspondingly form a plurality of orthographic projection patterns on the reference plane... the optical microstructures scatter the image beam transmitted to the projection screen
Implementation Method 2
The Fresnel structures are located on a surface of the substrate facing the image-source side and arranged along a first direction
Data Source
AI summary
A projection screen including a substrate, Fresnel structures and a protective layer is provided. The Fresnel structures are located on a surface of the substrate facing an image-source side and arranged along a first direction. Each Fresnel structure extends along a second direction. The protective layer has a first surface facing the image-source side. The first surface has optical microstructures. The optical microstructures are orthographically projected on a reference plane to form orthographic projection patterns. Each of the orthographic projection patterns has a first axis and a second axis substantially perpendicular to each other. The first axis passes through two end points having a maximum distance in the first direction. The second axis passes through two end points having a maximum distance in the second direction. Each of the orthographic projection patterns is symmetry to at least one of the first axis and the second axis.