Projection Screen Light Control Layer Diffusion
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Solution Overview
Problem
Conventional screens for projecting images from projectors face challenges in maintaining image brightness and adjusting observation distance due to limited diffusion ranges, leading to issues with visibility when observers move closer, as the image on the periphery becomes dark or invisible, and the screens become thick and heavy with increased diffusion ranges.
Innovation Solution
A screen with a substrate, a light reflection layer featuring prism portions, and a light control layer that adjusts diffusion distribution according to position, allowing for controlled light transmission and diffusion, enabling adjustable observation distance while maintaining image brightness by varying the diffusion range and direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the diffusion range of the light control layer is increased to improve visibility when observers approach the screen, then the diffusion area is widened, but the light control layer requires more stacked layers resulting in a thick and heavy screen
Solution Approach 1:
The patent applies local quality by creating position-dependent diffusion characteristics in the light control layer. Different regions of the screen (center vs. periphery) have optimized light control properties, allowing the center region to provide sufficient diffusion for close observers while the periphery maintains appropriate diffusion angles, eliminating the need to uniformly increase diffusion range across the entire screen.
Solution Approach 2:
The patent implements dynamics by making the diffusion angle adjustable based on observer position. The light control layer can dynamically adapt its diffusion characteristics - providing larger diffusion angles when observers are close to the screen and smaller diffusion angles when observers are far away, thereby maintaining image brightness without requiring a fixed thick structure.
2Illumination intensity
If the diffusion range of the light control layer is increased to maintain image brightness at the periphery when observers approach, then more layers are stacked, but the screen becomes thick and heavy
Solution Approach 1:
The patent addresses periphery brightness by applying local quality optimization. The light control layer is designed with position-dependent diffusion characteristics where the diffusion angle varies across different regions. This allows the periphery regions to maintain appropriate diffusion angles that prevent dark images when observers approach, without requiring uniform increases in layer stacking across the entire screen thickness.
3Area of stationary object
If a screen with general mat characteristic is used to widen the diffusion area, then the diffusion area is widened and observation distance can be adjusted, but the image becomes dark for the observer
Solution Approach 1:
The patent applies parameter changes by controlling the diffusion angle as a variable parameter rather than using a fixed mat characteristic. The light control layer adjusts the diffusion angle parameter based on observer position and screen region, providing sufficient diffusion area for various observation distances while maintaining image brightness through optimized angular distribution of reflected light.
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 screen effectively adjusts the diffusion distribution of reflected light to maintain image brightness and visibility across different observation distances, preventing the image from becoming dark at the periphery and reducing the need for a thick screen structure.
Implementation Method 1
a light reflection layer including (b1) a plurality of prism portions formed to be arranged on a main surface of the substrate and having a sectional serrulate shape in an arrangement direction, and (b2) a plurality of light reflection portions formed in surface portions of the plurality of prism portions, for reflecting an incident light
Implementation Method 2
a light control layer formed on a surface of the light reflection layer, and in a function section that includes a predetermined control direction among directions parallel to the main surface of the substrate and is perpendicular to the main surface of the substrate, the light control layer allowing a light incident to pass on the light reflection layer and allowing a reflected light to diffuse from the light reflection layer
Data Source
AI summary
A screen in which observation distance may be adjusted while maintaining image brightness and a projection system using the screen. In a light control layer of a screen, a first angle region that determines a diffusion distribution of a reflected light is different according to the screen position in a control direction in which light diffusion control is performed. Accordingly, a diffusion distribution of image light emitted from a screen surface is adjusted to be tilted downward by an upper end and upward by a lower end according to the screen position. Thus, for example, a size of a diffused angle range is maintained to be 30°, and a direction in which the image light is diffusion-emitted corresponds to an assumed position of an observer. The projection image can be observed while maintaining brightness of an image and the observation distance L can be adjusted to be short.