LCD Module Sealing with Grooved Gap and Edge Adhesive
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Solution Overview
Problem
Existing liquid crystal display (LCD) modules in industrial control products face reliability issues due to electrochemical corrosion and sealant failures, which lead to disconnection, no display, and black spot failures, especially in harsh environments with high temperature and humidity, and current solutions are insufficient for meeting high-reliability and long-term operation requirements.
Innovation Solution
A module structure for LCDs is designed with a grooved gap between the panel edge and housing retaining wall, filled with a waterproof and airtight adhesive, and a strengthened terminal part protective adhesive that covers the edge of the front glass sheet, along with an elastic buffering sheet to prevent adhesive penetration, enhancing sealing and waterproof performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal part protective adhesive is coated on the LCD controller and a module housing retaining wall is provided around the display panel, then the display can prevent foreign matters from entering the panel gap, but the sealing performance is insufficient for high-reliability requirements in harsh industrial environments with high temperature and humidity
Solution Approach 1:
The patent divides the sealing system into multiple segments: the original sealant around the LCD panel, a newly created grooved gap structure, and panel edge protective adhesive filled into this gap. This segmentation allows each component to perform its sealing function independently, creating multiple barriers against water vapor infiltration and enhancing overall sealing performance for high-reliability industrial applications
Solution Approach 2:
The patent introduces a grooved gap structure as an intermediary element between the display panel and the module housing retaining wall. This gap structure serves as a mediator that receives and contains the panel edge protective adhesive, creating an additional sealing layer that specifically targets water vapor infiltration paths without interfering with the original sealant function
2Strength
If the display panel is closely attached onto the module housing retaining wall to prevent foreign matters from entering, then the structural integrity is improved, but the sealant may be damaged due to stress concentration at the attachment interface
Solution Approach 1:
The patent creates a grooved gap structure before attaching the display panel to the module housing retaining wall. This pre-formed gap structure acts as a cushioning layer that absorbs and distributes attachment stresses, preventing stress concentration at the sealant interface and thereby protecting the sealant from damage while maintaining structural integrity
Solution Approach 2:
The grooved gap structure serves as an intermediary layer between the display panel and the module housing retaining wall. This mediator structure provides mechanical decoupling that reduces stress transmission to the sealant, allowing strong attachment while protecting the sealant from stress-induced failure
Data Source
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AI summary
The present disclosure relates to a module structure of a liquid crystal display, the module structure includes a panel glass assembly, a backlight assembly and a display housing retaining wall; an accommodating space formed by the display housing retaining wall accommodates the panel glass assembly and the backlight assembly; the panel glass assembly includes a front glass sheet, a rear glass sheet and a sealant for sealing a liquid crystal accommodating space between the front glass sheet and the rear glass sheet. The module structure is characterized in that, a filling gap is provided between outer peripheral surfaces of the front glass sheet and the rear glass sheet of the panel glass assembly and an inner peripheral surface of the display housing retaining wall facing the outer peripheral surfaces; and a panel edge protective adhesive is filled in the filling gap. The present disclosure also relates to a manufacturing process of the module structure.