Microlens Projection Screen Resolving Ambient Light Reflection
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Solution Overview
Problem
Front projection televisions suffer from lower contrast due to the reflection of ambient light, which affects the quality of the displayed image, especially in environments with significant environmental light sources.
Innovation Solution
A display screen with a topography that includes a combination of light reflecting and light absorbing portions, where the light reflecting portions are configured to reflect projected light and the light absorbing portions are designed to absorb ambient light, thereby improving the contrast of the displayed image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional projection screen is used, then the screen can display projected images, but ambient light reflection reduces image contrast and viewability
Solution Approach 1:
The screen surface is segmented into multiple microlens elements, each independently focusing light. This segmentation allows the screen to selectively reflect projected light while absorbing ambient light, resolving the contradiction between maintaining image display and reducing ambient light reflection
Solution Approach 2:
Different regions of the screen have different optical properties - the microlens portions reflect projected light to enhance image contrast, while the inter-lens portions absorb ambient light. This local differentiation resolves the contradiction by applying different treatments to different functional zones
2Illumination intensity
If light reflecting portions are added to improve image visibility, then projected light is enhanced, but ambient light reflection increases reducing contrast
Solution Approach 1:
The screen employs local quality by creating distinct microlens regions with high reflectivity for projected light while maintaining absorbing characteristics in the inter-lens regions for ambient light. This spatial differentiation of optical properties resolves the contradiction between enhancing projected light and minimizing ambient light reflection
Solution Approach 2:
The screen converts the harmful effect of ambient light reflection into a beneficial selective reflection system. By using microlens geometry, the screen reflects only light from specific angles (projected light) while absorbing light from other angles (ambient light), thus converting the general problem of light reflection into a selective advantage
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 screen effectively reduces ambient light reflection, enhancing the contrast and viewability of the projected image in various lighting conditions, including daylight environments.
Implementation Method 1
the light reflecting portions may be configured to substantially reflect light transmitted from the first surface
Implementation Method 2
the light absorbing portions may be configured to substantially absorb environmental light
Data Source
AI summary
A display screen is provided. The display screen may be configured to receive an image from a display device, and includes a first surface with a topography configured to transmit light from the image, and a second surface configured with light reflecting portions and light absorbing portions. The light reflecting portions may be configured to substantially reflect light transmitted from the first surface, and the light absorbing portions may be configured to substantially absorb environmental light.