LCD Module Mold Frame Corner Gap Design
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Solution Overview
Problem
Conventional liquid crystal display (LCD) modules are prone to glass cracking and damage from stress such as vibration or impact, particularly at the corner parts due to concentrated stress, which is not effectively mitigated by existing buffer materials.
Innovation Solution
The LCD module design features a mold frame with a larger gap between the liquid crystal cell and guides at the long-side corner parts compared to the long-side inner parts, dispersing the load and reducing stress concentration on the glass surface, thereby preventing cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If positioning lugs are formed at the corner parts of the frame to position the liquid crystal cell, then the liquid crystal cell can be positioned in the planar direction, but stress such as vibration or impact is concentrated on the corner parts and is likely to damage the liquid crystal cell
Solution Approach 1:
The patent applies local quality by making the guides have different gap sizes at different locations: smaller gaps at inner parts and larger gaps at corner parts. This localized variation in gap size allows the structure to provide different levels of support and stress distribution depending on the location, preventing stress concentration at corners while maintaining positioning accuracy at inner parts.
Solution Approach 2:
The patent employs asymmetry by designing the guides with asymmetric gap distribution relative to the liquid crystal cell - the gaps are not uniform but are specifically larger at corner parts and smaller at inner parts. This asymmetric design optimizes stress distribution by providing more clearance at corners where stress concentration occurs, while maintaining tighter positioning at inner parts.
2Object-affected harmful factors
If a buffer material is placed on the positioning members at the corner parts to reduce stress, then glass cracking can be avoided, but the device complexity increases
Solution Approach 1:
The patent extracts the stress reduction function from a separate buffer material component and integrates it directly into the guide structure itself. By making the guides have inherently larger gaps at corner parts, the stress reduction capability is built into the basic structure, eliminating the need for additional buffer materials and reducing overall device complexity.
Solution Approach 2:
The patent merges the positioning function and stress reduction function into a single integrated guide structure. The guides simultaneously provide positioning (through the gap mechanism) and stress reduction (through larger corner gaps), combining multiple functions into one component rather than requiring separate elements.
3Object-affected harmful factors
If the gap between the liquid crystal cell and guides is made larger at corner parts, then stress concentration is reduced and glass cracking is prevented, but the positioning precision may be affected
Solution Approach 1:
The patent applies local quality by implementing different gap sizes at different locations of the guides - smaller gaps at inner parts for precise positioning and larger gaps at corner parts for stress reduction. This localized differentiation ensures that positioning precision is maintained where needed while stress distribution is improved where required.
Solution Approach 2:
The patent segments the guide structure into different functional zones along its length - inner part zones with smaller gaps for positioning and corner part zones with larger gaps for stress reduction. This segmentation allows each zone to perform its specific function optimally without compromising the other.
Data Source
Figure 1
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Figure 3A~3B
AI summary
The LCD module according to the present disclosure includes a liquid crystal cell and a mold frame accommodating the liquid crystal cell. The mold frame includes a support supporting the liquid crystal cell in a thickness direction of the liquid crystal cell and a guide for limiting movement of the liquid crystal cell in a planar direction of the liquid crystal cell. The guide includes a corner-part guide facing a corner part of a side of the liquid crystal cell, and an inner-part guide facing an inner part of the side of the liquid crystal cell, the inner part being a part of the side other than the corner part. On at least one side of the liquid crystal cell, a gap between the liquid crystal cell and the corner-part guide is larger than a gap between the liquid crystal cell and the inner-part guide.