Projection Screen Microstructure for Dual Focus Compatibility
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Solution Overview
Problem
Current projection screens are not compatible for both long-focus and ultra-short-focus projectors, leading to increased user costs and reduced space utilization, and they suffer from low contrast due to ambient light interference in home environments.
Innovation Solution
A projection screen with a reflective layer featuring microstructure units having obliquely opposite planes that reflect projection light at different angles, combined with a light absorption layer to manage ambient light, allowing the screen to be used with both long-focus and ultra-short-focus projectors while maintaining high contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a projection screen is designed with a specific microstructure for long-focus projectors, then it performs well with small incident angles, but it cannot be used with ultra-short-focus projectors that emit light at large angles
Solution Approach 1:
The patent applies universality by designing a single projection screen with microstructure units that can serve multiple functions: reflecting both small-angle incident light from long-focus projectors and large-angle incident light from ultra-short-focus projectors. The microstructure units with obliquely opposite planes enable the screen to adapt to different incident angle ranges, making one screen compatible with different projector types.
Solution Approach 2:
The patent applies segmentation by dividing the reflective surface into multiple microstructure units, each containing obliquely opposite planes. These segmented structures allow different portions of the microstructure to handle different incident angle ranges, with each plane oriented to reflect specific angle ranges effectively.
2Object-affected harmful factors
If a projection screen uses a single reflective surface, then the structure is simple, but it cannot provide high contrast in environments with ambient light
Solution Approach 1:
The patent applies local quality by creating microstructure units with obliquely opposite planes that have different orientations. Each plane is locally optimized to reflect projection light while directing ambient light away from the viewing area. This local differentiation of reflective properties enables the screen to distinguish between projection light and ambient light, improving contrast.
3Speed
If the microstructure planes are oriented for small incident angles, then long-focus projectors work well, but ultra-short-focus projectors cannot achieve adequate reflection angles
Solution Approach 1:
The patent applies asymmetry by designing microstructure units with obliquely opposite planes rather than symmetric structures. The asymmetric orientation of these planes allows the structure to effectively reflect both small-angle incident light (from long-focus projectors) and large-angle incident light (from ultra-short-focus projectors), covering a broader incident angle range while maintaining reflection efficiency.
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 single screen to be used for both projector types, enhancing viewing angles and contrast by effectively reflecting projection light and absorbing ambient light, thus improving usability and visual quality.
Implementation Method 1
each of the plurality of microstructure units includes a first plane and a second plane that are obliquely opposite in a first direction, and a third plane and a fourth plane that are obliquely opposite in a second direction... at least a part of the projection light incident at a first incident angle within a first angle range is reflected at the first plane and the second plane to enter into a field of view of a viewer
Implementation Method 2
a light absorption layer for absorbing light... effectively reflecting projection light and absorbing ambient light
Data Source
AI summary
A projection screen and a projection system. The projection screen includes a reflection layer and a light absorption layer for absorbing light which are sequentially arranged from an incident side of projection light; the reflection layer comprises multiple microstructure units; each microstructure unit comprises a first plane and a second plane which are opposite to each other at an angle in a first direction as well as a third plane and a fourth plane which are opposite to each other at an angle in a second direction.