Foldable Display Hinge with Inclined Protrusions
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Solution Overview
Problem
Flexible displays in foldable electronic devices can experience delamination due to a small radius of curvature in the bending region, leading to structural integrity issues and potential breakage during bending.
Innovation Solution
The electronic apparatus features a hinge device connecting two chassis with a display that extends over them, utilizing carbon-fiber reinforced resin plates with metal frames and inclined protruding pieces to increase the radius of curvature of the bending region, ensuring stability and minimizing thickness while preventing delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the display is bent with a small radius of curvature to achieve a thin form factor, then the device thickness is reduced, but delamination and structural integrity issues occur
Solution Approach 1:
The patent applies different structural characteristics to different regions of the display assembly. The bending region has a larger radius of curvature compared to other regions, while the non-bending regions maintain a thinner profile. This local differentiation allows the display to achieve an overall thin form factor while preventing delamination in the critical bending area.
Solution Approach 2:
The patent specifically designs the bending region with a controlled radius of curvature that is larger than conventional designs. This increased curvature radius in the bending region prevents the display layers from delaminating while still allowing the display to be folded. The curved surface geometry is optimized to balance thinness with structural integrity.
2Reliability
If the bending region radius of curvature is increased to prevent delamination, then structural integrity is improved, but the device thickness increases
Solution Approach 1:
The patent implements a localized solution where only the bending region has an increased radius of curvature, while the rest of the display maintains a thin profile. This is achieved through selective structural design in the bending region that does not propagate the increased thickness to the entire display area.
Solution Approach 2:
The display is segmented into different functional regions: bending regions with larger radius of curvature and non-bending regions with smaller thickness. This segmentation allows each region to be optimized for its specific function - the bending regions prevent delamination while the non-bending regions contribute to the overall thin form factor.
3Reliability
If carbon-fiber reinforced resin plates with metal frames are used to increase bending radius, then delamination is prevented, but device complexity increases
Solution Approach 1:
The patent employs composite materials (carbon-fiber reinforced resin) combined with metal frames to create a structurally robust bending region. This composite construction provides the necessary strength and rigidity to maintain a large radius of curvature and prevent delamination, while the materials themselves are integrated into the display structure.
Solution Approach 2:
The patent merges multiple functional elements into integrated components. The metal frames are combined with the carbon-fiber reinforced resin plates to create a unified structural element that serves both as a support structure and as part of the display assembly. This merging reduces the number of separate components and simplifies the overall structure.
Data Source
AI summary
An electronic apparatus includes: a first chassis; a second chassis; a hinge device connecting the first and second chassis in a relatively rotatable manner; a display having a bending region; a first plate; and a second plate. In the first posture, the bending region of the display has a bag-shaped bending shape in cross section that protrudes from end faces of the first plate and the second plate disposed to overlap each other. The electronic apparatus further has a first inclined face protruding from the end face of the first plate to be inclined gradually downward from the surface of the first plate in the protruding direction, and a second inclined face protruding from the end face of the second plate to be inclined gradually downward from the surface of the second plate in the protruding direction.