Light Guide Plate Movement Prevention Structures
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Solution Overview
Problem
Liquid crystal display devices face appearance defects and component damage due to component movement during assembly, vibration, or drop, particularly with the edge-type backlight unit, where the light guide plate may shift horizontally or vertically, leading to misalignment and increased manufacturing time and costs.
Innovation Solution
Incorporating movement prevention structures at both sides of the light guide plate and forming opening portions in the lower cover to allow these structures to be inserted into the support main during injection-molding, preventing horizontal and vertical movement without requiring additional mold costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the light guide plate is made thinner to achieve slimmer design, then the thickness is reduced, but the rigidity becomes weaker causing component movement
Solution Approach 1:
The support main is divided into multiple insertion portions that receive movement prevention structures from the light guide plate. This segmentation allows the thin light guide plate to be supported at multiple discrete points, preventing movement while maintaining overall thinness. The support main itself is segmented into regions for light guide plate support and liquid crystal panel support, allowing independent optimization of each component's stability.
Solution Approach 2:
The movement prevention structures are formed as integral parts of the light guide plate, with the support main containing insertion portions that receive these structures. This nested configuration allows the support main to house the movement prevention features without adding external components, maintaining a compact and integrated structure that supports the thin light guide plate effectively.
2Stability of the object's composition
If a separate movement prevention structure is added to the light guide plate, then component stability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The movement prevention structures are merged with the light guide plate as integral features rather than separate components. The support main is also integrated with the lower cover through the injection molding process. This merging reduces the total number of parts and assembly steps while providing effective movement prevention, thereby reducing manufacturing complexity despite improving stability.
Solution Approach 2:
The support main serves multiple functions: it supports the light guide plate through insertion portions, supports the liquid crystal panel through light-shielding tape, and provides structural framework for the entire backlight unit. The light guide plate simultaneously provides optical guidance and structural support through its integrated movement prevention structures. This multi-functionality reduces the need for additional dedicated components.
3Ease of manufacture
If movement prevention structures are integrated into the injection-molding process, then manufacturing cost is reduced, but the mold design complexity increases
Solution Approach 1:
The movement prevention structures are formed during the initial injection-molding process of the light guide plate, before final assembly. The support main is also pre-formed with insertion portions that correspond to these structures. This preliminary formation of movement prevention features during molding eliminates the need for post-assembly operations, reducing manufacturing steps and costs despite requiring coordinated mold design.
Data Source
AI summary
The present invention relates to a liquid crystal display device and a method for fabricating the same, and the liquid crystal display device may be configured by including a light guide plate with a plurality of movement prevention structures at both sides thereof, respectively; a lower cover with opening portions at the positions corresponding to the plurality of movement prevention structures, and on which the light guide plate being disposed; a light source unit disposed at a side of the light guide plate; a support main with insertion portions for inserting and mounting the movement prevention structures at the positions corresponding to the opening portions; a diffuser sheet and an optical sheet disposed on the light guide plate; and a liquid crystal panel disposed at an upper portion of the support main.