Impact Resistant LCD Frame with Corner Recesses
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Solution Overview
Problem
Conventional liquid crystal display devices with thin glass substrates are prone to cracking under external impact due to stress concentration at the corners, which compromises the reliability of the device.
Innovation Solution
A molded resin frame with strategically placed recesses at the corners to distribute stress and prevent cracking, ensuring the substrates do not crack when subjected to external impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If recesses are formed in the molded resin frame to prevent stress concentration, then substrate cracking is prevented, but the frame structure becomes more complex
Solution Approach 1:
The corner portions of the molded resin frame are segmented into multiple recesses (first, second, third, and fourth recesses) that divide the stress distribution areas. This segmentation allows the frame to better absorb and distribute impact forces, preventing stress concentration at single points while maintaining overall structural integrity.
Solution Approach 2:
Different regions of the molded resin frame are given different structural qualities through the selective placement of recesses. The corner portions have localized recesses that provide enhanced stress distribution capabilities exactly where impact forces are most likely to concentrate, while other areas maintain their original structural properties.
2Device complexity
If the molded resin frame contacts only the first substrate at corner portions, then the frame structure is simpler, but stress concentration occurs causing substrate cracking
Solution Approach 1:
The contact interface between the molded resin frame and substrates is segmented into multiple distinct contact regions. The first recess creates a first contact portion between the frame and first substrate, while the second recess creates a second contact portion. This segmentation distributes the mechanical stress across multiple points rather than concentrating it at a single corner, preventing substrate cracking.
Solution Approach 2:
The molded resin frame acts as an intermediary element between the external environment and the fragile glass substrates. By incorporating recesses that create distributed contact portions, the frame mediates impact forces, absorbing and distributing them across multiple contact points before they can reach the substrates, thereby protecting the substrates from cracking.
Data Source
AI summary
A liquid crystal display device includes a molded resin frame, and a liquid crystal display panel formed by putting first and second substrates together and set in the molded resin frame. Two thick corner parts of the liquid crystal display panel where the first and the second substrate overlap each other, and two thin corner parts of the liquid crystal display panel including only the first substrate are separated from the molded resin frame by forming recesses in parts of the molded resin frame corresponding to the thick and the thin corner parts of the liquid crystal display panel. Each of the recesses respectively corresponding to the thin corner parts of the liquid crystal display panel has an end part corresponding to a part of the liquid crystal display panel where a corner part of the second substrate and a part of a side of the first substrate overlap each other.