Projection Screen Elastic Tensioning Flatness
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Solution Overview
Problem
Existing projection screens, particularly hard screens, face challenges in maintaining flatness and preventing deformation due to their large size and fragile nature, which affects the quality of the projected image.
Innovation Solution
A projection screen design incorporating a hard screen board, a soft woven cloth, an adhesive layer, and elastic connecting members, where the woven cloth is adhered to the back of the screen board and stretched to a flat state using elastic connecting members, with the frame providing additional support to maintain flatness and prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large-sized hard screen board is used to improve display area and optical performance, then the light-receiving area and image quality are improved, but the screen board becomes more prone to deformation and loses flatness
Solution Approach 1:
A flexible woven cloth is adhered to the back surface of the hard screen board. This woven cloth acts as a tensioning membrane that can be stretched and fixed to the frame, providing continuous surface support across the entire large-area screen board without requiring rigid structural divisions, thereby maintaining flatness while preserving the large light-receiving area.
Solution Approach 2:
The screen board is divided into multiple smaller sections or panels that are separately mounted and tensioned. Each segment can be individually flattened and secured to the frame through elastic connecting members, reducing the overall deformation risk while collectively providing a large continuous light-receiving area when viewed from the front.
2Area of stationary object
If the screen board is made larger to improve display area, then the projection size is increased, but the screen board becomes more fragile and deformation-prone
Solution Approach 1:
The flexible woven cloth adhered to the back of the screen board provides distributed structural reinforcement across the entire large surface area. This membrane structure increases the overall rigidity and deformation resistance of the large screen board without compromising its light-receiving properties or requiring厚重 materials that would reduce reliability.
Solution Approach 2:
The projection screen combines the hard screen board material with the flexible woven cloth to create a composite structure. The hard board provides the primary light-receiving surface with large area, while the woven cloth backing provides tensile strength and deformation resistance, together enhancing the reliability of the large-sized screen.
3Stability of the object's composition
If elastic connecting members are used to stretch and flatten the screen board, then the flatness and uniform tension are improved, but the device complexity increases
Solution Approach 1:
The elastic connecting members serve multiple functions simultaneously: they attach the woven cloth to the frame, provide continuous tensioning force to maintain flatness, distribute load uniformly across the screen board, and compensate for thermal expansion or contraction. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving uniform tension distribution.
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
This design ensures the hard screen board remains flat and prevents deformation, enhancing the quality of the projected image by maintaining uniform tension and reducing the risk of bulges and bubbles, thus improving optical display performance.
Implementation Method 1
The adhesive layer connects the screen board and the woven cloth to each other
Implementation Method 2
elastic connecting members are connected to the woven cloth, and second ends of the elastic connecting members are connected to the frame, so as to stretch the woven cloth and the screen board to a flat state by virtue of tension of the elastic connecting members
Data Source
AI summary
A projection screen includes a screen board, a woven cloth, an adhesive layer, a frame, and elastic connecting members. The woven cloth is arranged on a back of the screen board, and an edge of the woven cloth is outside an edge of the screen board. The adhesive layer is connected to the screen board and the woven cloth respectively. The frame is arranged on a peripheral side of the screen board. First ends of the elastic connecting members are connected to the woven cloth, and second ends of the elastic connecting members are connected to the frame, so as to stretch the woven cloth and the screen board to a flat state by virtue of tension of the elastic connecting members.