Reflection Screen Surface Shape Layer Deflects Ceiling Light
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing reflection screens fail to minimize the reflection of images onto the ceiling, particularly in dark rooms, where the ceiling area appears bright and motion videos are obscured, disrupting the viewing experience due to the large angle of projection and lack of effective countermeasures in prior art.
Innovation Solution
A reflection screen with a surface shape layer featuring unit optical shapes having a triangular sectional shape, where the incidence surface and total reflection surface are designed to deflect image light towards the reflection layer, minimizing ceiling reflections by controlling the angles and refractive indices to ensure image light is directed towards the observer, while extraneous light is absorbed or diffused away from the viewer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a smooth surface on the image source side is used, then the manufacturing process is simple, but image light is reflected onto the ceiling causing image reflection
Solution Approach 1:
The surface is segmented into multiple unit optical shapes (prisms) arranged in an array. Each unit optical shape has specific angular parameters (α, β, γ) that control light direction. This segmentation transforms the smooth surface into a structured surface that deflects image light toward the reflection layer while preventing ceiling reflection.
Solution Approach 2:
Different regions of the surface have different optical properties through the arrangement of unit optical shapes. The incidence surfaces and total reflection surfaces of each unit optical shape are designed with specific angles to locally control light paths, directing image light to the reflection layer while preventing extraneous light from reaching the ceiling.
2Volume of moving object
If the angle of projection is enlarged, then space saving is achieved, but ceiling reflection becomes more pronounced
Solution Approach 1:
The angular parameters of the unit optical shapes (α, β, γ) are optimized to work with enlarged projection angles. By adjusting these parameters, the invention maintains effective image light deflection even when the projector is positioned at larger incidence angles, thereby enabling space saving while controlling ceiling reflection.
3Illumination intensity
If a reflection layer is added on the back side, then image brightness is enhanced, but device complexity increases
Solution Approach 1:
The invention combines the surface shape layer with unit optical shapes directly on the image source side with a reflection layer on the back side of the screen. This merging of optical functions into a single integrated structure enhances image brightness through the reflection layer while maintaining manageable device complexity through the unified design.
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 effectively reduces ceiling reflections, enhances image brightness, and maintains high image utilization efficiency, providing a clear and pleasant viewing experience by directing image light towards the observer and absorbing or diffusing extraneous light.
Implementation Method 1
a surface shape layer provided on the reflection screen on the side of the image source relative to the reflection layer, the surface shape layer having a plurality of unit optical shapes arrayed at a surface on the image source side, the surface shape layer adapted to deflect the image light toward the reflection layer side
Implementation Method 2
each of the unit optical shapes has an incidence surface on which the light is incident, and a total reflection surface on which at least part of the light coming from the incidence surface is totally reflected to go toward the back side
Data Source
AI summary
A reflection screen includes: a reflection layer provided on the back side and adapted to reflect light; and a surface shape layer provided on the reflection layer, at the image source side relative to the reflection screen, the surface shape layer having a plurality of unit optical shapes arrayed and deflecting image light toward the reflection layer side. The unit optical shape satisfies, in a section along the array direction of the unit optical shapes and orthogonal to a screen plane, the relationship of α+2φ−θ>90°, where θ is an angle that a total reflection surface makes with a plane parallel to the screen plane, φ is an angle that an incidence surface makes with a normal direction to the screen plane, and α is an angle that light incident on the incidence surface makes with the normal direction to the screen plane.