Projection Surface with Privacy Filter for Light Blow-By Control
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Solution Overview
Problem
When using a video projector to create special lighting and visual effects on a clear surface like transparent plastic or scrim fabric, a significant portion of the light passes through the surface and is projected onto an additional surface behind it, leading to diminished visual quality and efficiency of the effects.
Innovation Solution
A projection surface comprising multiple layers: a first layer to prevent light reflection, a second layer for image formation, and a third layer with a privacy screen filter that appears transparent from one viewpoint and translucent or opaque from another, preventing light from passing through to an additional surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent projection surface is used to create visual effects, then the clarity and visibility of the projection is improved, but light passes through to additional surfaces causing diminished visual quality and efficiency
Solution Approach 1:
The projection surface is divided into multiple functional layers: a transparent support layer, a reflective layer for image formation, and a privacy screen filter layer to control light direction. This segmentation allows each layer to perform its specific function while collectively solving the light blow-by problem
Solution Approach 2:
The privacy screen filter layer exhibits direction-dependent optical properties - it appears transparent when viewed from the projection angle but blocks light when viewed from other angles. This local quality variation in different viewing directions prevents light from passing through to additional surfaces while maintaining projection visibility
2Productivity
If a privacy screen filter layer is added to prevent light blow-by, then light efficiency is improved, but the device complexity increases
Solution Approach 1:
The privacy screen filter layer serves multiple functions simultaneously: it acts as a directional light controller to prevent blow-by, maintains transparency for the projected image, and provides structural support. This multi-functionality reduces the need for additional separate components
Solution Approach 2:
The projection surface combines multiple materials with different optical properties into a composite structure - transparent support material, reflective coating material, and privacy screen filter material - to achieve the desired light control characteristics
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 solution enhances the brightness and efficiency of the projected images by preventing light from being projected onto additional surfaces, while conserving resources, reducing costs, and allowing for a wider range of special lighting and visual effects.
Implementation Method 1
a first layer comprising a material that prevents reflection of light
Implementation Method 2
a third layer comprising a privacy screen filter. The third layer may cause the projection surface to appear translucent from a viewpoint of the light source emitting the light at the projection angle
Data Source
AI summary
A system may comprise a projection surface and a light source. The projection surface may comprise a first layer comprising a material that prevents reflection of light, a second layer comprising a transparent image forming material, and a third layer comprising a privacy screen filter. The second layer may be provided between the first layer and the third layer. The light source may be configured to emit light on the projection surface to create an image on the projection surface. The light source may face the first layer. The light may be emitted at a projection angle on the projection surface. The third layer may cause the projection surface to appear translucent from a viewpoint of the light source emitting the light at the projection angle.