Reinforcing Plates for Laptop Display Chassis Bending Stress
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Solution Overview
Problem
The increased height of modern laptop display chassis due to a changing aspect ratio from 16:9 to 16:10 leads to bending stress on the back cover when rotated, causing uneven contact with the display and reducing the component's lifespan due to concentrated stress at the hinge attachment point, especially in thinner designs.
Innovation Solution
Incorporating a pair of reinforcing plates along the side edges of the display chassis, which are fixed to both the display and the back cover, to distribute stress evenly and prevent bending, combined with a curved back cover design and a friction mechanism in the hinge to maintain structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the back cover is made thinner to reduce overall device thickness, then the device becomes more compact and portable, but the back cover becomes more prone to bending and stress concentration when the display chassis is rotated
Solution Approach 1:
The patent combines the thin back cover with reinforcing plates to create a composite structure. The back cover maintains its thin profile while the reinforcing plates (made of stronger material) are attached to its rear surface to provide additional structural support and resist bending stresses during rotation, effectively creating a composite component that achieves both thinness and strength
Solution Approach 2:
Instead of increasing the thickness of the back cover in the vertical dimension, the patent adds reinforcing plates that extend in the horizontal dimension along the side edges. This dimensional approach allows the back cover to remain thin while distributing stress across a larger area through the laterally extending reinforcing structure
2Length of moving object
If the display chassis height is increased to achieve a 16:10 aspect ratio, then the display area is increased, but the back cover experiences greater bending stress and uneven contact with the display during rotation
Solution Approach 1:
The patent divides the back cover into multiple segments by attaching reinforcing plates at specific locations (side edges) rather than making the entire back cover uniformly thick. This segmentation allows the back cover to maintain its lightweight, thin profile while providing targeted reinforcement where bending stresses occur most frequently during rotation
Solution Approach 2:
The reinforcing plates are strategically positioned at the side edges of the back cover where bending stresses are most concentrated during rotation. This local reinforcement provides targeted strength exactly where needed, rather than uniformly increasing the strength of the entire back cover, thus maintaining the overall thin design while addressing the specific weakness caused by the increased height
3Strength
If reinforcing plates are added to prevent bending, then structural integrity is improved, but the device complexity and manufacturing process become more complicated
Solution Approach 1:
Instead of reinforcing the entire back cover uniformly, the patent applies reinforcing plates only to critical areas (the side edges where bending stresses concentrate). This partial reinforcement approach provides sufficient structural integrity to prevent bending during rotation while avoiding the excessive complexity of a fully reinforced back cover structure
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 reinforcing plates effectively distribute stress, preventing bending and ensuring the display chassis maintains structural integrity, enhancing usability and extending the lifespan of the component by providing consistent support without excessive pressure on the display.
Implementation Method 1
a friction mechanism in the hinge to maintain structural integrity
Implementation Method 2
the reinforcing plates effectively distribute stress, preventing bending and ensuring the display chassis maintains structural integrity
Data Source
AI summary
An electronic apparatus includes a main body chassis and a display chassis that are rotatably connected at connecting edges via a hinge. The display chassis has a display, a back cover covering the rear face of the display, and a pair of reinforcing plates extending along edge walls, each reinforcing plate having a proximal end fixed to the back cover together with a connecting plate of the hinge at the connecting edge and having a front face fixed to the display and a rear face fixed to the back cover. The back cover includes a main plate having a curved shape that is convex toward rear; and an injection-molded resin frame around the main plate and having a flat surface. The reinforcing plates are fixed to the flat surface.