Drawn Sheet-Packed Coherent Fiber Bundle for Borderless Displays
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Solution Overview
Problem
Electronic devices with displays face challenges in minimizing display borders and maintaining optical quality due to misalignment and separation of fiber cores in coherent fiber bundles used for image transport, which affect the appearance and integrity of the image displayed.
Innovation Solution
A drawn sheet-packed coherent fiber bundle is used, where fiber cores with bends are embedded in elongated strands of binder, stacked, and fused to form a sheet-stacked coherent fiber bundle, then drawn to reduce lateral dimensions and improve alignment, enhancing optical quality by minimizing fiber misalignment and separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a coherent fiber bundle is used for image transport, then the display can achieve a borderless appearance, but fiber misalignment and lateral separation occur causing degraded optical quality
Solution Approach 1:
The fiber bundle is segmented into multiple individual filaments that are processed separately through the drawing operation. Each filament contains multiple fiber cores that maintain their relative positions while the entire bundle is drawn down, allowing precise control of fiber spacing and alignment in the final product.
Solution Approach 2:
The drawing process changes the physical parameters of the fiber bundle by applying controlled tension and heat to reduce the lateral dimensions. This parameter change (draw ratio) simultaneously improves fiber alignment and reduces lateral separation between cores while maintaining the borderless appearance.
2Area of stationary object
If the coherent fiber bundle lateral dimensions are reduced, then the display border is minimized, but fiber misalignment and lateral separation increase degrading optical quality
Solution Approach 1:
The filaments are pre-formed with the desired fiber core arrangements before the drawing operation. This preliminary structuring ensures that when the bundle is drawn down to reduce lateral dimensions, the fiber cores maintain proper alignment and spacing rather than becoming misaligned.
Solution Approach 2:
The mechanical drawing process replaces traditional assembly methods for reducing bundle size. By using controlled thermal-mechanical drawing instead of mechanical compression or assembly, the fiber cores are drawn down uniformly maintaining their relative positions and reducing lateral separation.
3Manufacturing precision
If fiber cores are drawn closer together, then lateral separation is reduced improving optical quality, but manufacturing complexity increases
Solution Approach 1:
Multiple fiber cores are merged into individual filaments during the drawing process. The binder material combines multiple cores into a unified filament structure, simplifying the manufacturing process while achieving reduced lateral separation between cores in the final packed bundle.
Solution Approach 2:
The fiber bundle uses composite construction with binder material holding multiple fiber cores within each filament. This composite structure allows the bundle to be drawn down effectively while maintaining fiber core integrity and achieving reduced lateral separation through the drawing process.
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 results in a borderless display appearance with improved optical quality by effectively transporting images from the input surface to the output surface while maintaining image integrity, with reduced lateral dimensions and enhanced alignment of fiber cores.
Implementation Method 1
The coherent fiber bundle may have an input surface that receives an image from the display and a corresponding output surface to which the image is transported
Implementation Method 2
The process of drawing the sheet-packed coherent fiber bundle reduces the lateral dimensions of the coherent fiber bundle
Implementation Method 3
Sheets of filaments can be stacked and fused together to form a sheet-stacked coherent fiber bundle
Data Source
AI summary
An electronic device may have a display, a display cover layer, and a drawn sheet-packed coherent fiber bundle. The coherent fiber bundle may have an input surface that receives an image from the display and a corresponding output surface to which the image is transported. The coherent fiber bundle may be placed between the display and the display cover layer and mounted to a housing. The coherent fiber bundle may have fiber cores with bends that help conceal the housing from view and make the display appear borderless. The coherent fiber bundle has filaments formed from elongated strands of binder in which multiple fibers are embedded. Sheets of filaments are stacked and fused together to form a block of material that is subsequently drawn to form the drawn sheet-packed coherent fiber bundle.