Dual Guide Panel Rib Mechanism for LCD Warpage
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Solution Overview
Problem
Liquid crystal display devices face issues with deformation due to shrinkage and expansion of polarizing plates, leading to light leakage and degraded display quality, particularly when attached using adhesive pads.
Innovation Solution
A dual-structure guide panel system is implemented, where the first guide panel is coupled with the bottom cover and the second guide panel provides movability to alleviate shrinkage and expansion stresses, with a rib and rib groove mechanism to prevent light leakage between panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the liquid crystal panel is attached to the guide panel using adhesive pads, then the structure is simple and easy to manufacture, but the polarizing plates shrink and expand causing warpage and light leakage
Solution Approach 1:
The guide panel is divided into a first guide panel and a second guide panel that are coupled together. The first guide panel provides structural support while the second guide panel accommodates the liquid crystal panel, allowing differential movement to relieve shrinkage and expansion stresses of the polarizing plates.
Solution Approach 2:
The coupling between the first and second guide panels allows relative movement, enabling the structure to dynamically adapt to the shrinkage and expansion of polarizing plates during temperature changes, preventing warpage and light leakage.
2Device complexity
If a single guide panel is used to attach the liquid crystal panel, then the structure is simple, but it cannot prevent light leakage caused by panel deformation
Solution Approach 1:
The guide panel is segmented into two separate panels coupled together, creating a multi-layer support structure that can independently manage structural stability and panel attachment, effectively preventing light leakage.
Solution Approach 2:
The first guide panel acts as an intermediary between the backlight unit and the second guide panel, providing a stable mounting surface for the backlight while allowing the second guide panel to accommodate the liquid crystal panel with movement capability.
3Stability of the object's composition
If the guide panel is made rigid to stabilize the liquid crystal panel, then warpage is prevented, but the structure becomes heavier and thicker
Solution Approach 1:
The guide panel system is segmented into two panels with different functions: the first guide panel provides rigid structural support for stability, while the second guide panel provides a lighter attachment surface for the liquid crystal panel, reducing overall weight.
Solution Approach 2:
Different parts of the guide panel system have different rigidity characteristics. The first guide panel has high rigidity for structural stability, while the coupling interface allows flexibility, and the second guide panel has lower rigidity to accommodate panel movement, optimizing the weight-stability balance.
Data Source
AI summary
A liquid crystal display device includes a bottom cover including a horizontal surface, and a side surface; a first guide panel coupled with the bottom cover, surrounding peripheral portions of a backlight unit using a first vertical portion, and including a first horizontal portion protruding perpendicularly toward an inner side of the first vertical portion; and a second guide panel including a second vertical portion placed right on an outer side surface of the first vertical portion, and a second horizontal portion protruding perpendicularly toward an inner side of the second vertical portion and onto a top surface of which the liquid crystal panel is fixed, wherein a rib protrudes at a top surface of the first horizontal portion, and a rib groove, into which the rib is inserted, is formed at a bottom surface of the second horizontal portion.