Reflective Screen Light-Absorption and Scattering Layers

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Solution Overview

Problem

Transmissive screens fail to provide sufficient brightness and contrast when used as reflective screens outdoors under bright illumination, and transmission projection screens are insufficient for reflective applications in such conditions.

Innovation Solution

A reflective screen design incorporating a light-absorption layer with 30-90% transmittance and a scattering layer containing diamond particles and/or metallic inorganic particles, which enhances image brightness and contrast by scattering projected light efficiently.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a transmissive screen is used as a reflective screen outdoors under bright illumination, then transparency is maintained, but brightness and contrast of the projected image become insufficient

Engineering Contradiction:

Improvebrightness of projected imageVSAvoidimage quality under bright illumination

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The screen is divided into multiple functional layers: a light-absorption layer (with sub-layers for different wavelength ranges) and a scattering layer. This segmentation allows each layer to perform its specific function - absorbing unwanted ambient light while scattering the projected light to enhance brightness and contrast, thereby resolving the contradiction between maintaining transparency and improving image quality under bright illumination.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The screen uses composite material structures including light-absorbing dyes or pigments combined with scattering particles (diamond particulates, metallic inorganic particles) in a transparent matrix. This composite approach enables simultaneous achievement of light absorption for contrast enhancement and light scattering for brightness improvement, while maintaining overall transparency for outdoor visibility.

Inventive Principle:

Principle #40Composite materials

2Ease of operation

If the light-absorption layer has high transmittance to maintain transparency, then outside scenery remains visible, but the brightness and contrast of the projected image deteriorate

Engineering Contradiction:

Improvevisibility of outside sceneryVSAvoidbrightness and contrast of projected image

Core Design Contradiction:

Ease of operationVSIllumination intensity

Solution Approach 1:

Different regions of the screen structure have different optical properties: the light-absorption layer selectively absorbs ambient light wavelengths while transmitting projected light wavelengths, and the scattering layer scatters projected light to enhance brightness. This local quality differentiation within the layered structure resolves the contradiction between maintaining transparency for scenery visibility and enhancing image brightness and contrast.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The screen utilizes parameter changes in light absorption and scattering based on wavelength and direction. The light-absorption layer changes transmittance parameters selectively for different wavelength ranges, while the scattering layer changes light direction parameters to redirect projected light toward viewers. These parameter changes enable simultaneous achievement of transparency and image quality enhancement.

Inventive Principle:

Principle #35Parameter changes

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 enables clear, high-brightness image projection under various lighting conditions, making it suitable for diverse applications including display windows, vehicles, and guide display boards, while maintaining transparency and flexibility.

Implementation Method 1

a light-absorption layer provided on the transparent substrate, the light-absorption layer absorbing visible light

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

a scattering layer provided on the light-absorption layer, the scattering layer scattering the projected light

Methodology Applied

Scientific EffectLight scattering: Scattering

Data Source

PatentUS10481480B2Reflection-type screen and sheet for reflection-type screen

Publication Date: 2019.11.19 NICCA CHEM COMPANY

AI summary

A reflective screen (1) displaying an image by projected light, comprises: a transparent substrate (10); a light-absorption layer (20) provided on the transparent substrate, the light-absorption layer reflecting the projected light; and a scattering layer (30) provided on the light-absorption layer, the scattering layer scattering the projected light, wherein the light-absorption layer has 30-90% transmittance with respect to visible light, and the scattering layer contains a light-scatterer (31) consisting of diamond particles and/or metallic inorganic particles.