Reflective Front Screen with Varying Mirror Inclinations
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Solution Overview
Problem
Existing reflective front screens suffer from high interference by outside light, leading to reduced visibility and contrast issues when used in bright environments, as the angle of the mirror forming areas is uniform across the screen, causing a wide region to be influenced by outside light and affecting the observation position.
Innovation Solution
The reflective front screen features a light diffusion layer and a light transmissive layer with mirror and non-mirror forming areas of varying inclinations, where the inclination of the mirror forming areas near the projector is greater than those farther away, reducing the area affected by outside light and enhancing image contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the mirror forming areas have a uniform inclination across the screen, then the manufacturing process is simple, but the region affected by outside light becomes wide, reducing image visibility and contrast
Solution Approach 1:
The patent applies local quality by varying the inclination angles of mirror forming areas across different regions of the screen. Specifically, the screen is divided into multiple regions with different inclination angles, such that areas more susceptible to outside light interference have inclinations designed to reflect outside light away from viewer positions, while other areas maintain inclinations optimized for projector light reflection. This regional differentiation resolves the contradiction by sacrificing uniform manufacturing simplicity for targeted reduction of outside light interference in specific problem areas.
2Object-affected harmful factors
If the mirror forming areas have varying inclinations to reduce outside light interference, then image visibility and contrast improve, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the screen into multiple discrete regions, each with a specific inclination angle for its mirror forming areas. This segmentation allows the complex varying inclination requirement to be broken down into manageable zones with uniform properties within each zone. The screen surface is partitioned into regions such as a first region with a first inclination angle and a second region with a second inclination angle, making the manufacturing process more tractable while still achieving the overall goal of reducing outside light interference through spatial variation.
3Volume of moving object
If the projector is placed diagonally on the lower front side to emit image light obliquely upward, then the projection distance is shortened and space is used more effectively, but the screen absorbs more outside light incident from the top
Solution Approach 1:
The patent applies parameter changes by systematically varying the inclination angles of mirror forming areas across different regions of the screen to compensate for the oblique projection geometry. When the projector is positioned diagonally on the lower front side emitting light obliquely upward, the screen regions are assigned different inclination angles optimized for that specific projection angle. This parameter variation ensures that projector light is effectively reflected to viewer positions while simultaneously directing outside light incident from the top away from the viewer, thus resolving the contradiction between space-efficient projector placement and outside light interference.
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
This design minimizes the region affected by outside light, thereby improving image visibility and contrast in bright environments by ensuring that outside light is not reflected towards the viewer, allowing for effective use in settings with varying lighting conditions.
Implementation Method 1
a light diffusion layer which diffuses and transmits only light incident from a specific angular region and transmits straight light incident from the other angular region
Implementation Method 2
a specular reflection film which is formed on a back surface of each mirror forming area and is formed of a material with reflectivity
Data Source
AI summary
A screen which reflects light emitted from a projector includes a light diffusion layer through which light incident from a specific angular region is diffused and transmitted and through which light incident from the other angular region is transmitted straight; area pairs having a mirror forming area and a non-mirror forming area; a light transmissive layer having a back surface, on which the area pairs are disposed, and an opposite surface being bonded to a back side of the light diffusion layer; and a specular reflection film formed on a back surface of each mirror forming area. An inclination of the mirror forming area with respect to a normal line of the screen close to the projector becomes larger than the inclination of the mirror forming area far from the projector within a cross section perpendicular to the mirror forming areas inside the screen.