Transmission-Type Transparent Screen Light Scattering Layer
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Solution Overview
Problem
Transmission-type transparent screens face challenges in maintaining clear see-through properties when no image-forming light is projected, and in achieving high visibility of screen images when light is projected, due to unwanted scattering and reduced contrast.
Innovation Solution
Incorporating a light absorbing material into the light scattering layer with specific haze, total light transmittance, and diffuse reflectance ranges, along with a laminated structure of transparent substrates and scattering layers, to control light scattering and absorption effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light scattering layer comprising a transparent resin and a light scattering material is used in a transmission-type transparent screen, then image-forming light can be scattered to form visible images for observers on the opposite side of the projector, but light from scenes on the first surface side and illumination on the second surface side is also scattered, causing the entire screen to look cloudy and reducing see-through clarity
Solution Approach 1:
The light scattering layer is segmented into multiple functional components: a transparent resin base, light scattering materials (such as TiO2 particles), and light absorbing materials (such as carbon black or iron oxide particles). This segmentation allows different regions of the layer to perform different functions - scattering image-forming light while absorbing unwanted scattered light from scenes and illumination, thereby resolving the cloudiness problem while maintaining image visibility
Solution Approach 2:
The patent employs composite materials by combining the transparent resin, light scattering materials, and light absorbing materials into a single integrated light scattering layer. This composite structure enables the layer to simultaneously achieve light scattering for image formation and light absorption to prevent cloudiness, resolving the technical contradiction between image visibility and see-through clarity
2Illumination intensity
If a light scattering layer with light scattering material is used to display images, then image-forming light is scattered to form visible images, but unnecessary scattering of light occurs which lowers image contrast and reduces visual recognition
Solution Approach 1:
The patent converts the harmful effect of unnecessary light scattering (which causes cloudiness and contrast loss) into a beneficial effect by introducing light absorbing materials. These materials absorb the scattered light that would otherwise degrade image quality, while allowing the necessary scattering of image-forming light to proceed. This transforms the harmful scattering into a controlled process that enhances rather than degrades image contrast
Solution Approach 2:
The patent optimizes the parameters of the light scattering layer by carefully controlling the types, amounts, and particle sizes of both light scattering materials and light absorbing materials. By adjusting these parameters, the layer achieves optimal balance between scattering image-forming light for visibility and absorbing other scattered light to maintain contrast, thereby resolving the contradiction between image brightness and contrast
3Adaptability or versatility
If light scattering materials are added to enable image projection, then the screen can display visible images, but the see-through property for scenes on the other side deteriorates due to increased scattering
Solution Approach 1:
The patent applies local quality by creating regions within the light scattering layer with different optical properties. The light scattering materials are distributed to provide scattering where needed for image formation, while light absorbing materials are positioned to selectively absorb scattered light from scene views. This local differentiation allows the screen to maintain both image display capability and see-through property simultaneously
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 enhances see-through clarity when no image-forming light is projected and improves image visibility when light is projected, by balancing haze, transmittance, and reflectance, thereby addressing the issues of unwanted scattering and contrast reduction.
Implementation Method 1
image-forming light L projected from a projector 200 and entered from the surface (first surface A) on the first transparent substrate 110 side, is scattered in the light scattering layer 134 to form an image
Implementation Method 2
the light scattering layer further contains a light absorbing material
Implementation Method 3
light of a scene on the first surface A side enters into the transmission-type transparent screen 101 from the first surface A, whereupon a part is scattered in the light scattering layer 134 and the rest is transmitted
Data Source
AI summary
To provide a transmission-type transparent screen which is excellent in the see-through property for a scene on the other side of the transparent screen as viewed from an observer in a state where no image-forming light is projected from a projector and which is excellent in visibility of an image displayed on the transparent screen as viewed from the observer in a state where image-forming light is projected from the projector, as well as an image display system and an image display method, employing the transparent screen. A transmission-type transparent screen 1 which has a first surface A and a second surface B on the opposite side thereof and which has a light scattering layer 34 comprising a transparent resin 32 and a light scattering material 33, wherein the light scattering layer 34 further contains a light absorbing material, the haze is from 3 to 30%, the total light transmittance is from 15 to 95%, and the diffuse reflectance is from 0.1 to 2.4%.