Portable Display Bottom Chassis I-Beam Side Walls
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Solution Overview
Problem
Portable display devices, such as LCDs and OLEDs, have become structurally weakened as they become slimmer, leading to increased damage and defects due to the elimination of protective components, necessitating an improvement in strength without increasing thickness.
Innovation Solution
The sides of the bottom chassis in the portable display device are designed with an I-beam or C-beam shaped cross-section to enhance structural strength, featuring a web and flanges that provide improved section modulus for supporting forces, allowing the device to be firmly fixed to a mold frame while maintaining a slim profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the portable display device is made slimmer by eliminating protective components, then the thickness and weight are reduced, but the structural strength deteriorates
Solution Approach 1:
The bottom chassis is segmented into a bottom chassis plate and separate side walls that protrude upward. This segmentation allows the side walls to be designed with I-beam or C-beam cross-sections that provide enhanced structural strength without increasing the overall thickness of the device. The side walls act as reinforcement elements that strengthen the bottom chassis while maintaining a slim profile.
Solution Approach 2:
The side walls are constructed with I-beam or C-beam shaped cross-sections that create a composite structural system. This geometry distributes mechanical loads more effectively across the chassis, enhancing overall strength without requiring additional material thickness. The I-beam or C-beam design provides high moment of inertia, improving resistance to bending and twisting forces.
2Weight of stationary object
If protective components are eliminated to reduce weight and volume, then the device becomes lighter and more compact, but the reliability deteriorates
Solution Approach 1:
The bottom chassis is divided into a plate and protruding side walls, creating a segmented structure that provides protective functions without adding significant weight. The side walls protrude from the plate to form reinforcement structures that protect internal components from impact and mechanical stress, thereby improving reliability while maintaining weight efficiency.
Solution Approach 2:
The I-beam or C-beam shaped side walls create a composite structural system that enhances protection against mechanical damage. This geometry provides high structural efficiency, allowing the chassis to withstand external forces without requiring additional protective components, thus maintaining reliability while keeping the device lightweight.
3Ease of manufacture
If the bottom chassis uses a simple plate structure, then the manufacturing is easier and cost is lower, but the strength to withstand external forces deteriorates
Solution Approach 1:
The bottom chassis is segmented into a bottom chassis plate and separate side walls that can be manufactured independently and then assembled together. This segmentation allows each component to be optimized for manufacturing simplicity while the assembled structure achieves enhanced strength. The side walls with I-beam or C-beam cross-sections provide the necessary structural reinforcement without complicating the manufacturing process significantly.
Solution Approach 2:
The combination of the bottom chassis plate and I-beam or C-beam shaped side walls creates a composite structure that achieves high strength-to-weight ratio. This design withstands external forces effectively while remaining relatively simple to manufacture, as the components can be produced using standard fabrication processes and then assembled together.
Data Source
AI summary
A portable display device is provided. The portable display device includes a liquid crystal display panel for displaying an image, a back light assembly having a light source for supplying light to the liquid crystal display panel, and a bottom chassis for supporting the back light assembly. The sides of the bottom chassis have an I-beam shaped or C-beam shaped cross-section.