Projection Screen Prism Structures Ambient Light Absorption
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Solution Overview
Problem
Conventional projection screens fail to provide images with sufficient brightness and contrast due to reflection of most projection light beams and ambient light, affecting the overall image quality.
Innovation Solution
A projection screen design featuring a substrate with prism structures and light absorbing structures, where the first inclined surface receives and reflects projection light beams efficiently, and the second inclined surface with light absorbing materials reduces ambient light reflection, improving image brightness and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional white projection screen without structure is used, then the screen is simple in structure, but most projection light beams are reflected to places without viewers, resulting in insufficient image brightness and contrast
Solution Approach 1:
The screen surface is segmented into multiple prism structures, each with first and second inclined surfaces. This segmentation allows different regions of the screen to direct light toward different viewing angles, improving brightness for viewers while maintaining structural organization.
Solution Approach 2:
Different regions of the screen are given different optical properties through the prism structures. The first inclined surfaces are optimized for reflecting projection light toward viewers, while the second inclined surfaces are equipped with light absorbing structures to minimize unwanted reflections, creating local quality variations that improve overall image brightness and contrast.
2Illumination intensity
If a conventional white projection screen without structure is used, then the screen is simple to manufacture, but ambient light is reflected to viewers, degrading image contrast
Solution Approach 1:
The second inclined surfaces of the prism structures are selectively treated with light absorbing structures to create local quality differences. This allows the screen to differentiate between projection light (which should be reflected) and ambient light (which should be absorbed), improving image contrast without requiring complete redesign of the entire screen structure.
Solution Approach 2:
The light absorbing structures on the second inclined surfaces convert the harmful effect of ambient light reflection into a beneficial feature. By strategically placing light absorbing materials on specific surfaces, the screen transforms what would normally be a source of contrast degradation into an element that actively improves image quality by absorbing unwanted ambient light.
3Illumination intensity
If the first angle of prism structures is made less than or equal to the second angle, then projection light beams can be efficiently reflected to viewers improving brightness, but the structure becomes more complex
Solution Approach 1:
The prism structures employ asymmetric angle design where the first angle is less than or equal to the second angle. This asymmetry is strategically designed to optimize the reflection of projection light beams toward viewer positions while maintaining manufacturability. The asymmetric configuration creates favorable light reflection paths without requiring overly complex structural arrangements.
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 design enhances image brightness by efficiently reflecting projection light beams and improves contrast by absorbing ambient light, resulting in improved image quality compared to conventional screens.
Implementation Method 1
The first inclined surface is configured to receive and reflect projection light beams
Implementation Method 2
The light absorbing structures are configured to absorb ambient light
Data Source
AI summary
A projection screen includes a substrate, a plurality of prism structures, and a plurality of light absorbing structures. The substrate includes a first surface adjacent to the projector and a second surface away from the projector. The prism structures are disposed on the first surface, and each of the prism structures includes a first inclined surface, a second inclined surface, and a bottom surface. The first inclined surface is configured to receive and reflect projection light beams. There is a first angle between the first inclined surface and the bottom surface, and a second angle between the second inclined surface and the bottom surface. The first angle is less than or equal to the second angle. The light absorbing structures are respectively disposed on at least a portion of the second inclined surface of each of the prism structures. The light absorbing structures are configured to absorb ambient light.