Dark Projection Screen with Translucent Diffuser for Contrast
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Solution Overview
Problem
Dark or black colored projection screens typically have low light reflection, resulting in poor image quality with low intensity and unsatisfactory contrast due to their optical properties, which are not compatible with effective image projection.
Innovation Solution
A projection screen comprising two distinct diffuse reflection elements, where one is translucent or transparent and the other is dark in color, with a textured surface to enhance diffuse reflection, allowing for high white luminance and low black luminance, thereby improving image brightness and contrast while maintaining a dark appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If dark or black colored media are used as projection screens, then the aesthetic appearance is improved, but the light reflection is reduced resulting in poor image quality
Solution Approach 1:
The projection screen is divided into two distinct functional layers: a translucent or transparent diffusing element and a dark-colored diffusing element. This segmentation allows each layer to perform its specific function - the translucent layer provides light diffusion while the dark layer provides aesthetic appearance, resolving the contradiction between image brightness and visual appeal
Solution Approach 2:
The invention uses a composite structure combining two different types of diffusing elements with complementary properties. The translucent/transparent element contributes to light transmission and diffusion, while the dark-colored element provides aesthetic appearance and low black luminance, creating a composite material system that achieves both high white luminance and dark appearance simultaneously
2Illumination intensity
If dark colored lacquered glass is used as projection screen, then the aesthetic appearance is improved, but the optical properties are incompatible with image projection
Solution Approach 1:
The screen is segmented into two functional layers where the translucent or transparent diffusing element handles light diffusion for reliable image projection, while the dark-colored diffusing element provides aesthetic appearance. This segmentation ensures both optical performance and visual appeal are achieved independently
Solution Approach 2:
The translucent or transparent diffusing element acts as an intermediary between the projector and the dark-colored element, enabling light to pass through and be diffused before reaching the dark layer, thus ensuring reliable image projection while maintaining dark aesthetic appearance
3Illumination intensity
If dark colored substrates are used, then the aesthetic appearance is improved, but fingerprints and dirt become extremely visible
Solution Approach 1:
The translucent or transparent diffusing element provides a light-colored surface layer that is less sensitive to dirt and fingerprint visibility, while the dark-colored element remains hidden behind it. This local quality differentiation resolves the contradiction by making the visible surface resistant to showing contaminants
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 achieves high white luminance values and low black luminance, providing excellent image brightness and contrast, reducing the visibility of dirt and fingerprints, and allowing for adjustable viewing angles, making it suitable for various projection applications.
Implementation Method 1
two distinct diffuse reflection diffusing elements
Implementation Method 2
The first diffusing element is translucent or transparent
Implementation Method 3
The second diffusing element is dark in color
Implementation Method 4
dark in color... low black luminance
Data Source
Figure 1A~2A
Figure 1B~2B
Figure 3D~4D
AI summary
An article used as a dark-coloured or black projection screen, comprising two separate, diffuse-reflection diffusing elements in the form of parallel planes or plates, referred to as first and second diffusing elements, characterised in that the first diffusing element is translucent or transparent and the second diffusing element is of a dark colour.