Multi-Layer Acoustic Transparent Projection Screen
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Solution Overview
Problem
Existing projection screens face issues with 'screen moire' due to the interference between the fabric structure and high resolution pixels, and visibility of the fabric structure at close viewing distances, which degrades image quality and contrast.
Innovation Solution
A screen comprising a plurality of bonded reflecting layers with varying densities, where the front layer is of high density and the subsequent layers are of lower density, allowing sound transmission while maintaining high resolution pixel reflection, and avoiding the use of a black backing screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a perforated or woven fabric screen is used to allow sound transmission, then sound transparency is improved, but the fabric structure interferes with high resolution pixels causing screen moire and reducing image quality
Solution Approach 1:
The screen is divided into multiple layers with different functions: a front layer with fine structure for high-resolution pixel reflection and backend layers with larger structures for sound transmission. This segmentation allows each layer to optimize for its specific function without compromising the other.
Solution Approach 2:
Different parts of the screen structure serve different purposes: the front layer has a fine, high-density structure optimized for reflecting high-resolution pixels, while the backend layers have coarser structures optimized for sound transmission. This local differentiation resolves the contradiction between image quality and sound transparency.
2Manufacturing precision
If the fabric density is increased to reduce visible structure and screen moire, then image quality is improved, but sound transmission is reduced
Solution Approach 1:
The screen structure is segmented into front and backend layers with different densities. The front layer uses high-density material to minimize visible structure and screen moire, while the backend layers use lower-density material to maintain sound transmission capabilities.
Solution Approach 2:
The screen combines different fabric materials with different properties: a high-density front layer material optimized for image quality and lower-density backend layer materials optimized for sound transmission. This composite structure allows both requirements to be satisfied simultaneously.
3Device complexity
If a single layer screen is used, then the structure is simple, but it cannot simultaneously achieve high resolution pixel reflection and adequate sound transmission
Solution Approach 1:
The screen is divided into multiple functional layers, each optimized for specific requirements. This segmentation enables the screen to achieve high-resolution pixel reflection and adequate sound transmission simultaneously, which would be impossible with a single layer.
Solution Approach 2:
The multi-layer screen structure performs multiple functions: the front layer reflects high-resolution pixels while the backend layers transmit sound. This multi-functionality allows a single screen assembly to satisfy multiple conflicting requirements that cannot be met by a single-layer design.
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 configuration prevents 'screen moire' by aligning the high-density front layer with the pixel grid, reduces visible structure, and enhances image resolution and contrast, allowing for different material combinations that would not work alone, such as a thin woven front layer and a thicker knitted back layer.
Implementation Method 1
a front reflecting screen (110) having an area mass in the range 5 - 40 g/m2
Implementation Method 2
a second reflecting screen (120) having an area mass in the range 10 - 80 g/m2
Implementation Method 3
Loudspeakers are positioned behind the screen and the perforations admit sounds through the screen, reaching the audience
Data Source
Figure 1~3
AI summary
A projection screen that allows sound to pass through the screen while video is reflected is provided. This screen is provided using a first non-perforated reflecting screen of a first density, and at least one perforated reflecting screen of a second density, wherein the first density is greater than the second density.