Reflection Screen Tint Layer for Front Projection Contrast
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Front projection display apparatuses with reflection type screens face issues of decreased contrast and brightness uniformity, especially in bright room conditions and short throw ratio setups, where external light affects image quality and uniformity.
Innovation Solution
A reflection screen design incorporating a tint layer with light absorbing particles, a Fresnel type reflection layer, and diffusion layers to selectively block external light and enhance image light reflection, featuring alternating tint and light transmission portions, and anisotropic diffusion layers to improve contrast and brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflection type screen is used to increase image brightness, then the brightness of the displayed image is improved, but the contrast of the image decreases due to external light in bright room conditions
Solution Approach 1:
The screen is divided into multiple regions with different properties: a first region with a first reflection characteristic for general image display, and a second region with a second reflection characteristic specifically optimized to reduce external light interference. This segmentation allows different parts of the screen to perform different functions, improving both brightness and contrast simultaneously.
Solution Approach 2:
Different regions of the screen are assigned different reflection characteristics tailored to their specific functions. The first region uses standard reflection properties for overall brightness, while the second region uses enhanced reflection properties specifically designed to minimize external light impact, thereby improving contrast in that localized area.
2Length of stationary object
If a short throw ratio projection display apparatus is used to reduce the distance between projector and screen, then the installation flexibility is improved, but the brightness uniformity across the screen decreases
Solution Approach 1:
The screen surface is segmented into multiple regions with different reflection characteristics. This allows compensation for the brightness non-uniformity caused by short throw ratio projection, as each region can be optimized to reflect light uniformly across its area, thereby improving overall brightness uniformity despite the reduced projection distance.
Solution Approach 2:
Different regions of the screen are assigned different reflection characteristics tailored to their specific positions. This local optimization compensates for the brightness variations inherent in short throw ratio projection, ensuring uniform brightness distribution across the entire screen surface even at reduced projection distances.
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 improves contrast and brightness uniformity by selectively blocking external light and diffusing image light, minimizing image loss and maintaining high contrast, even in bright conditions and short throw ratio configurations.
Implementation Method 1
a tint layer disposed before the reflection layer and including light absorbing particles to block a portion of the incident light
Implementation Method 2
a reflection layer configured to reflect an incident light including an image light projected from a projector
Implementation Method 3
an anisotropic diffusion layer provided the reflection layer and configured to diffuse the image light reflected from the reflection layer in more a horizontal direction than in a vertical direction
Data Source
AI summary
Provided is a front reflection screen for a front projection display apparatus. The front reflection screen includes a reflection layer configured to reflect an incident light including an image light projected from a projector and an external light, and a tint layer disposed before the reflection layer and including light absorbing particles to block a portion of the incident light.