Projection Screen Wire Grid Angles for Brightness Uniformity
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Solution Overview
Problem
Projection screens have a relatively small visible angle and non-uniform brightness due to the limited ability to selectively reflect projection light while minimizing ambient light reflection, leading to reduced image contrast and brightness.
Innovation Solution
A projection screen design featuring a substrate with a first area and a second area, each with wire grid structures that gradually change angles to optimize the reflection and diffusion of projection light, increasing the visible angle and reducing light loss, thereby enhancing brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If micro-structural reflection is provided on the projection screen to focus projection light at a certain angle, then image brightness in a range of orientation angle is increased, but the visible angle of the projection screen becomes relatively small and brightness uniformity deteriorates
Solution Approach 1:
The projection screen is segmented into multiple regions (first area and second area) with different wire grid structures. Each region has wire grid bodies with different angles, allowing different parts of the screen to reflect light to different directions, thereby expanding the overall visible angle while maintaining brightness in each region.
Solution Approach 2:
Different regions of the projection screen are assigned different local optical properties through wire grid bodies with different angles. The first area has wire grid bodies with a first angle and the second area has wire grid bodies with a second angle, allowing each local region to optimize light reflection for its specific viewing direction, achieving both brightness and wide visible angle.
2Illumination intensity
If micro-structural reflection is provided to increase brightness gain, then image brightness is increased, but brightness uniformity across different viewing angles deteriorates
Solution Approach 1:
The wire grid bodies are designed with asymmetric angle distributions - the first area has wire grid bodies with a first angle while the second area has wire grid bodies with a second angle. This asymmetric design allows the screen to uniformly distribute brightness across different viewing angles by compensating for the natural non-uniformity of light reflection.
3Ease of operation
If the projection screen reflects ambient light, then visibility in ambient conditions is improved, but image contrast deteriorates due to increased minimum brightness
Solution Approach 1:
The wire grid structures are designed to have directionally selective reflection properties. They are configured to preferentially reflect projection light (which comes from a specific direction) while minimizing reflection of ambient light (which comes from various directions), thereby improving contrast while maintaining visibility.
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 design increases the visible angle and brightness uniformity of the projection screen by reflecting projection light to a position closer to the center, ensuring more light enters the viewer's sight and improving image contrast.
Implementation Method 1
The design increases the visible angle and brightness uniformity of the projection screen by reflecting projection light to a position closer to the center
Data Source
AI summary
A projection screen includes a substrate with a first substrate surface. The first substrate surface includes a first region and a second region adjacent to the first region. Multiple first wire grid bodies extending in a first direction are provided in the first region. Multiple second wire grid bodies extending in the first direction are provided in the second region. Each first wire grid body includes a first contact surface connected to the substrate and a first surface, and a first angle is formed therebetween. The first angles gradually decrease in a direction from the first region to the second region. Each second wire grid body includes a second contact surface connected to the substrate and a third surface, and a third angle is formed therebetween. The third angles gradually increase in a direction from the first region to the second region.