Chemically Strengthened Coherent Fiber Bundles for Display Border Reduction
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Solution Overview
Problem
Electronic devices with displays face challenges in protecting sensitive display structures from damage, particularly in minimizing display borders and maintaining image integrity during image transport, while also accommodating optical sensors and other components.
Innovation Solution
A chemically strengthened coherent fiber bundle is used as an image transport layer that can warp and transform images, minimizing display borders by deforming fiber shapes and incorporating optical sensors, with ion-exchanged glass creating compressive stress for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a chemically strengthened coherent fiber bundle is used as an image transport layer, then the display is protected from damage and durability is enhanced, but the manufacturing complexity increases due to ion-exchange processes and asymmetric stress application
Solution Approach 1:
The ion-exchange process is performed in advance to create compressive stress in the coherent fiber bundle before the device is assembled. This preliminary strengthening action ensures the display is protected from damage before it is even installed, resolving the contradiction by enhancing durability through pre-applied chemical treatment rather than requiring complex protective structures during assembly.
Solution Approach 2:
The patent applies asymmetric ion-exchange to create non-uniform compressive stress distribution within the coherent fiber bundle. By changing the stress parameters asymmetrically (different stress levels on different surfaces), the patent achieves both enhanced durability and the ability to minimize display borders, while the controlled nature of this parameter change keeps manufacturing complexity manageable.
2Shape
If asymmetric compressive stress is applied to create curved-cross-sectional profiles, then display borders are minimized and image integrity is maintained, but the manufacturing precision requirements increase
Solution Approach 1:
The patent deliberately applies asymmetric ion-exchange to create curved-cross-sectional profiles in the coherent fiber bundle. This asymmetric treatment causes differential compressive stress that bends the fibers into curved shapes, which in turn minimizes display borders and maintains image integrity. The asymmetry principle transforms a potential manufacturing challenge into a design feature that solves multiple problems simultaneously.
Solution Approach 2:
Different regions of the coherent fiber bundle are subjected to different levels of compressive stress through localized ion-exchange processes. This creates local variations in the fiber bundle's cross-sectional shape, with some areas having curved profiles and others maintaining planar shapes. This local quality approach allows precise control over the final shape while managing manufacturing precision requirements.
3Adaptability or versatility
If optical sensors are integrated through the coherent fiber bundle, then device functionality is enhanced, but the structural integrity and image transport quality may deteriorate
Solution Approach 1:
The coherent fiber bundle is segmented into different functional regions: some fibers are designated for image transport while others are allocated for optical sensor integration. This segmentation allows optical sensors to be embedded within the fiber bundle structure without compromising the image transport function of the remaining fibers. The segmented approach maintains overall structural integrity while enhancing device functionality.
Solution Approach 2:
The coherent fiber bundle serves multiple functions simultaneously: it acts as an image transport layer, provides structural protection through chemically strengthened surfaces, and accommodates optical sensors for additional device functionality. This multi-functionality resolves the contradiction by designing the fiber bundle to fulfill multiple roles without sacrificing reliability in any single function.
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 effectively protects the display from damage, minimizes borders by warping images, and integrates optical sensors within the fiber bundle, ensuring image integrity and durability against scratches and cracks.
Implementation Method 1
The surfaces of the coherent fiber bundle may include ion-exchanged glass that places theses surfaces under compressive stress
Data Source
AI summary
An electronic device may have a display and other optical components such as optical sensors. The display and other components may be overlapped by chemically strengthened glass coherent fiber bundles. The surfaces of a coherent fiber bundle may include ion-exchanged glass that places theses surfaces under compressive stress. In some configurations, the coherent fiber bundle is symmetrically stressed and has equal amounts of compressive stress on opposing surfaces. In other configurations, the coherent fiber bundle is asymmetrically stressed and has more compressive stress on one surface than the other. The coherent fiber bundle may have areas with curved cross-sectional profiles, planar areas, and/or areas with compound curvature. Sensor windows may be formed in the coherent fiber bundle that are surrounded by an opaque area. When overlapping a display, the coherent fiber bundle may serve as a display cover glass layer.