Chamfered LCD Substrate Corners Prevent Cracking
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Solution Overview
Problem
The existing liquid crystal display modules for mobile phones face issues of cracking and chipping at the corners due to misalignment between the liquid crystal display panel and the resin-molded frame, particularly when using glass substrates, which affects manufacturing yield and mechanical strength.
Innovation Solution
The implementation of a chamfered structure at the corners of the liquid crystal display panel's non-overlapping area, where the diagonal side intersects the longer and shorter sides, with a specific relationship between the distances from the intersection points to the corner, reduces the risk of cracking and chipping during mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a glass substrate with thickness of 0.3 mm or thinner is used to reduce the thickness of the liquid crystal display module, then the thickness is reduced, but the mechanical strength decreases and the risk of cracking and chipping at corners increases
Solution Approach 1:
The patent applies different structural treatments to different parts of the glass substrate. Specifically, the corners of the non-overlapping area are provided with a chamfered structure while the rest of the substrate maintains its original thickness. This local modification strengthens the vulnerable corner regions without increasing the overall thickness of the substrate, thus resolving the contradiction between thinness and mechanical strength.
2Reliability
If a clearance is provided at each corner of the recess to prevent cracking and chipping, then corner damage is reduced, but the alignment precision between the liquid crystal display panel and the recess decreases
Solution Approach 1:
The patent pre-provides chamfered structures at the corners of the glass substrate before mounting. These chamfers act as preliminary protective features that prevent cracking and chipping during the mounting process. By preparing the corner structures in advance, the patent eliminates the need for clearances at the recess corners, thereby maintaining alignment precision while still preventing corner damage.
3Adaptability or versatility
If the non-overlapping area of the first substrate is used to mount a semiconductor chip or connect a flexible printed circuit board, then functionality is enhanced, but the risk of cracking and chipping at the corners of the non-overlapping area increases
Solution Approach 1:
The patent applies the chamfered structure specifically to the corners of the non-overlapping area of the first substrate, where semiconductor chips or flexible printed circuit boards are mounted. This localized structural enhancement protects the corners that are most vulnerable due to the mounting activities, allowing the non-overlapping area to fulfill its functional purpose while maintaining corner integrity.
Data Source
AI summary
The liquid crystal display (LCD) device of the present invention includes a LCD panel and a resin-molded frame that houses the LCD panel, the LCD panel including first and second substrates, and a liquid crystal layer sandwiched between the first and second substrates. The two-dimensional shapes of the first and second substrates are rectangles having longer and shorter sides, the longer side of the first substrate being longer than that of the second substrate. The first substrate has a non-overlapping area that does not overlap with the second substrate. Among the four corners of the first substrate, the non-overlapping area of the first substrate has two corners adjacent to each other. At least one of the two corners forms a chamfered structure having a diagonal side that intersects the longer and shorter sides of the first substrate with the diagonal side inclined to the longer and shorter sides.