Screw Fixation for LCD Panel and Backlight Module Assembly
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Solution Overview
Problem
The existing liquid crystal display (LCD) bonding method using light-shielding tape is costly and unreliable due to decreased adhesive ability over time, leading to potential separation of the display panel and backlight module.
Innovation Solution
A screw structure is used to fix the display panel and backlight module, with threaded holes and a cushioning pad, along with detecting devices to ensure accurate alignment and pressure monitoring, replacing the adhesive tape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light-shielding tape with acrylic binder is used to bond display panel and backlight module, then initial bonding is achieved, but adhesive ability decreases over time and temperature causing separation risk
Solution Approach 1:
The patent replaces the chemical bonding system (acrylic adhesive tape) with a mechanical bonding system (screws and threaded holes). This substitution eliminates the problem of adhesive degradation over time and temperature, as mechanical fastening does not rely on chemical bonds that weaken with thermal cycling and aging. The screws provide consistent, reliable fixation throughout the product lifecycle.
Solution Approach 2:
The patent changes the bonding mechanism from chemical adhesion to mechanical fastening. This parameter change fundamentally alters how the display panel and backlight module are connected, transitioning from a system susceptible to thermal and temporal degradation to one that maintains constant fixing force regardless of environmental conditions.
2Reliability
If light-shielding tape covers all frames to ensure bonding reliability, then fixation strength is improved, but cost increases
Solution Approach 1:
The patent divides the continuous bonding approach (light-shielding tape covering all frames) into discrete localized fastening points (multiple screws distributed across the frame). This segmentation allows achieving reliable bonding at critical points without the need for continuous material coverage, thereby reducing overall material consumption and cost while maintaining structural integrity.
Solution Approach 2:
The patent applies fixing force locally at specific threaded hole positions rather than distributing adhesive uniformly across the entire frame perimeter. This local quality approach concentrates bonding effort where structurally necessary, eliminating waste of bonding material in non-critical areas and reducing overall material requirements.
3Manufacturing precision
If multiple threaded holes are used for screw fixation, then positioning precision and fixation stability are improved, but device complexity increases
Solution Approach 1:
The patent designs threaded holes that serve multiple functions: they provide precise positioning during assembly, act as fastening points for screws, and ensure uniform distribution of mechanical stress across the bond interface. This multi-functionality reduces the need for separate positioning features, thereby managing complexity while achieving high positioning precision.
Solution Approach 2:
The threaded holes are pre-formed in both the display panel and backlight module before final assembly. This preliminary action ensures precise alignment and positioning is built into the components themselves, eliminating the need for complex alignment mechanisms during assembly and reducing overall system complexity.
Data Source
AI summary
The present application provides a liquid crystal display comprising a display panel, a backlight module, and a plurality of connecting screws. Wherein, the display panel and the backlight module have a plurality of correspondingly arranged threaded holes, and the plurality of connecting screws cooperate with the plurality of threaded holes to fix the display panel and the backlight module together.