Projection Screen with Segmented Convexes for Brightness and Contrast
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional screens used in close projection systems struggle to produce images with high brightness and contrast when displaying on large screens from short distances due to inefficient light reflection and high outside light interference, especially in environments with significant ambient light.
Innovation Solution
A screen design featuring convexes on a flat surface with a clearance between them, which selectively reflects diagonal incident light to prevent it from reaching areas between the convexes, combined with an anti-reflection member to reduce outside light reflection, allowing for efficient light direction towards the audience and maintaining high contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a flat screen surface with high reflectivity is used, then brightness is improved, but contrast deteriorates due to reflection of outside light
Solution Approach 1:
The screen surface is segmented into multiple convexes (protruding portions) instead of a flat surface. Each convex has a specific shape and orientation that selectively reflects projection light while blocking outside light from reaching the screen surface, thereby improving contrast while maintaining brightness.
Solution Approach 2:
Each convex on the screen surface has locally optimized properties: specific curvature, orientation, and position that enable selective light reflection. The convexes are arranged to reflect projection light from specific angles while blocking outside light from different directions, creating local quality variations that solve the brightness-contradiction problem.
2Length of moving object
If close projection is used to display on large screens, then projection distance is reduced, but image brightness deteriorates due to large incident angles
Solution Approach 1:
The screen uses convexes with curved surfaces instead of flat surfaces. The curvature of each convex is specifically designed to reflect projection light incident at large angles (from close projection) back toward the audience, converting the harmful large incident angle into beneficial light redirection that maintains image brightness.
Solution Approach 2:
The convexes have asymmetric shapes and orientations that are specifically tailored to handle oblique incident light from close projection. The asymmetric geometry enables selective reflection of projection light while blocking outside light, optimizing performance for the specific projection geometry of close projection systems.
3Illumination intensity
If high reflectance materials are used to improve brightness, then image brightness is improved, but contrast deteriorates due to reflection of outside light
Solution Approach 1:
The screen surface is divided into multiple convexes that act as individual light-selective elements. Each convex can be optimized for specific reflectance properties, allowing high reflectance for projection light while maintaining blocking capability for outside light, thereby resolving the brightness-contrast trade-off.
Solution Approach 2:
The screen structure changes the geometric parameters (convex shape, size, spacing, orientation) rather than relying solely on material reflectance properties. This geometric configuration enables selective light interaction that achieves high brightness for projection light while blocking outside light, improving contrast without sacrificing brightness.
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 the display of high-brightness, high-contrast images on large screens from short distances without the need for increased projection light, even in bright environments, while reducing power consumption and manufacturing costs.
Implementation Method 1
The convexes reflect diagonal incident light coming in a predetermined direction other than the normal line direction of the flat surface
Implementation Method 2
block the diagonal incident light by reflecting the incident light such that the incident light cannot reach each area between the adjoining convexes
Implementation Method 3
an anti-reflection member provided on the side of the substrate opposite to the side having the convexes to reduce reflection of light
Data Source
AI summary
A screen includes a plurality of convexes disposed on a flat surface with a clearance left between one another. The convexes reflect diagonal incident light coming in a predetermined direction other than the normal line direction of the flat surface, and block the diagonal incident light by reflecting the incident light such that the incident light cannot reach each area between the adjoining convexes on the flat surface.