Reflection Screen Prism Reflecting Layer Thickness Profile
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Solution Overview
Problem
Conventional reflection type screens face challenges in maintaining high video image contrast and gain due to uniform thickness of the reflecting layer, which leads to increased stray light and reduced image quality.
Innovation Solution
A reflection type screen design featuring a base portion with prism portions having inclined surfaces and a reflecting layer with varying thicknesses, including a first thin portion, a thick portion, and a second thin portion, to enhance reflectivity and absorptance, thereby improving contrast and gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the thickness of the flat reflecting layer is uniformly increased, then the gain of the video image light reflected on the reflecting layer is improved, but the contrast of the video image light reflected on the reflecting layer is lowered due to increased stray light reflection
Solution Approach 1:
The reflecting layer is designed with non-uniform thickness, featuring a first thin portion, a thick portion, and a second thin portion in sequence from the intersection line of the inclined surfaces. This local variation in thickness allows different regions to perform different functions: the thin portions reduce stray light reflection while the thick portion maintains high reflectivity for video image light, thereby resolving the contradiction between gain and contrast
2Object-affected harmful factors
If the thickness of the flat reflecting layer is uniformly decreased, then the contrast of the video image light reflected on the reflecting layer is improved, but the gain of the video image light reflected on the reflecting layer is reduced
Solution Approach 1:
By implementing local quality variation in the reflecting layer thickness, the patent achieves both high contrast and high gain simultaneously. The thick portion ensures sufficient reflectivity for video image light to maintain gain, while the thin portions minimize stray light reflection to preserve contrast, thus resolving the contradiction
3Ease of manufacture
If a uniform thickness reflecting layer is used, then the manufacturing process is simple, but the image quality is compromised due to either increased stray light or reduced video image light reflection
Solution Approach 1:
The patent applies local quality principle by creating a reflecting layer with spatially varying thickness. This can be achieved through techniques such as selective deposition or masking during manufacturing, allowing precise control of thickness distribution to optimize both image quality parameters while maintaining reasonable manufacturing complexity
Solution Approach 2:
The patent changes the thickness parameter of the reflecting layer from a uniform value to a spatially varying profile. This parameter change enables the reflecting layer to simultaneously achieve high reflectivity for video image light and low reflectivity for stray light, thereby improving image quality without fundamentally altering the manufacturing process
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 effectively increases the gain of video image light reflection while improving contrast by optimizing the reflectivity and absorptance of the reflecting layer, reducing stray light and enhancing overall image quality.
Implementation Method 1
a reflecting layer, being formed on the one of the pair of surfaces and reflecting light
Data Source
AI summary
A reflection type screen including: a base portion which is tabular; and prism portions which are provided on one surface of the base portion, extending in one direction and lined up in a direction intersecting the one direction, wherein the prism portions each have: a pair of surfaces, at least one of the pair of surfaces being inclined with respect to the normal direction of the one surface of the base portion and intersecting the other of the pair of surfaces; and a reflecting layer, being formed on the one of the pair of surfaces and reflecting light, and the reflecting layer includes, on the one of the pair of surfaces, a first thin portion, a thick portion and a second thin portion in this order from a side of an intersection line of the one of the pair of surfaces and the other of the pair of surfaces.