Back-lit Screen Frame Design for Uniform Illumination
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Solution Overview
Problem
Composite back-lit screens experience irregular illumination at the meeting points of individual screens, resulting in non-uniform lighting and unsightly dark stripes, which can interfere with chroma keying processes.
Innovation Solution
A screen controller and method for forming an output image feed that includes a predetermined color in the border region around the subject, along with a back-lit screen design where the frame's forward-most part coincides with its exterior contour, allowing light to reach the entire screen surface and minimizing dark lines at interfaces, and a controller for independently controlling the color and intensity of illuminators in a composite screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple individual back-lit screens are arranged next to each other to form a composite screen, then the overall size and shape flexibility of the screen is improved, but irregular illumination and dark stripes appear at the meeting points
Solution Approach 1:
The patent applies local quality by making the frame structure transparent or translucent at the meeting points of composite screens, allowing light to pass through these critical regions. This creates a localized improvement in light transmission at the interfaces between individual screens, eliminating dark stripes while maintaining the modular composite structure.
Solution Approach 2:
The patent introduces an intermediary solution by using transparent/translucent frame members at the meeting points to mediate between the individual screens and the light sources. These intermediary frame elements act as light transmitters that bridge the gap between adjacent screens, ensuring uniform illumination across the composite structure.
2Stability of the object's composition
If the frame extends laterally beyond the sheet to provide structural support, then the structural stability is improved, but light is obstructed creating dark regions at the meeting points
Solution Approach 1:
The patent applies local quality by differentiating the frame structure into two zones: opaque frame members for structural support at non-critical areas, and transparent/translucent frame members at meeting points where light transmission is essential. This localized differentiation allows the frame to simultaneously provide structural stability and enable light passage where needed.
3Ease of operation
If the entire screen is illuminated with predetermined color for chroma keying, then the chroma keying process is simplified, but computational intensity increases and unwanted reflections occur on the subject
Solution Approach 1:
The patent applies local quality by illuminating only the border region surrounding the subject with the predetermined chroma key color, while leaving the central region where the subject is located unilluminated or differently illuminated. This localized illumination approach reduces the total light output and computational processing requirements while maintaining effective chroma keying capability.
Solution Approach 2:
The patent applies partial action by providing chroma key illumination only to the extent necessary for the border region, rather than illuminating the entire screen uniformly. This partial illumination approach achieves sufficient chroma keying functionality with reduced energy consumption and computational overhead.
4Strength
If the frame structure is made opaque to provide structural support, then the structural integrity is improved, but light transmission is blocked creating dark stripes
Solution Approach 1:
The patent applies local quality by making the frame structure transparent or translucent specifically at the meeting points of composite screens, while maintaining opaque construction elsewhere for structural support. This localized transparency allows light to pass through critical interface regions, eliminating dark stripes while preserving overall structural integrity.
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 ensures uniform illumination across the screen, reducing the occurrence of dark stripes and enhancing chroma keying by allowing for precise control of lighting, including reducing green spill and improving the seamless appearance of composite screens.
Implementation Method 1
Because the sheet material is translucent, and not transparent, light from the lamps passes through the sheet material and is scattered by it so that a viewer at the front of the screen sees the screen as having a somewhat uniform overall luminance
Data Source
AI summary
A back-lit screen comprising: a rigid frame extending around the periphery of the screen and having a front face, the front face having an interior face which defines an opening, and an outer face which defines the exterior contour of the frame transversely to the opening; and a translucent sheet extending across the opening; the frame being configured so that over at least a part of the periphery of the screen the forward-most part of the interior face is coincident with the exterior contour of the frame.