LCD PCB Fixing Bracket and Cover Shield Design
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Solution Overview
Problem
Conventional liquid crystal display devices face issues with line defects, separation of fixing tapes, hot spots due to exposed LED arrays, and difficulty in reducing thickness and noise, primarily related to the method of fixing and grounding the printed circuit board (PCB).
Innovation Solution
A liquid crystal display device design that eliminates the need for screws and bracket structures by using a cover shield to fix and ground the PCB, incorporating a PCB fixing bracket with a '⊏'-shaped accommodating portion and a conductive cover shield for enhanced grounding, reducing the size of openings, and utilizing non-conductive adhesion tape for improved fixing force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If screws are used to fix the driving PCB to the bracket, then the PCB is securely fixed, but line defects occur during product testing
Solution Approach 1:
The patent removes the screws from the fixing mechanism entirely. Instead of using screws to attach the driving PCB to the bracket, the invention uses a fixing tape that adheres the PCB directly to the bracket surface, eliminating the mechanical fastening components that cause line defects during testing.
Solution Approach 2:
The patent replaces the mechanical screw-based fixing system with an adhesive-based fixing system. The fixing tape uses adhesive properties rather than mechanical threading to secure the PCB, thereby eliminating the harmful mechanical interactions that cause line defects during product testing.
2Reliability
If fixing tape is used to attach the driving PCB to the bracket, then screw-related line defects are avoided, but the fixing tape separates during attachment
Solution Approach 1:
The patent employs a composite fixing structure consisting of the fixing tape in combination with the bracket and PCB. The fixing tape is designed with specific adhesive properties and structural characteristics that enable it to maintain strong bonding between the PCB and bracket without separating during attachment or operation.
3Ease of manufacture
If the opening at the cut part of the cover bottom is made large, then the PCB bracket can be properly formed, but LED array exposure causes hot spots
Solution Approach 1:
The patent applies different properties to different parts of the cover bottom structure. The cut part is designed with specific dimensions and positioning that allow bracket formation while minimizing LED exposure. The opening size and shape are locally optimized to balance manufacturing requirements with thermal management concerns.
4Object-affected harmful factors
If the opening at the cut part of the cover bottom is made small, then hot spots are prevented, but the conductive tape becomes too small for proper grounding
Solution Approach 1:
The patent extends the bracket structure in a different spatial dimension (protruding from the side surface) rather than relying solely on the opening size in the planar dimension. This allows the conductive tape to achieve adequate bonding area and grounding effectiveness without requiring a large opening that would cause LED exposure and hot spots.
5Reliability
If a bracket is provided at one side of the cover bottom to fix the source PCB, then the PCB can be grounded through screws, but the device thickness cannot be reduced
Solution Approach 1:
The patent removes the traditional bracket structure and screw-based grounding mechanism. Instead, the source PCB is directly attached to the cover bottom using adhesive, eliminating the additional thickness required for brackets and screw heads while maintaining grounding capability through the adhesive bond and direct contact.
6Reliability
If screws are used to couple the source PCB to the cover bottom, then grounding is achieved, but the device thickness increases
Solution Approach 1:
The patent replaces the mechanical screw-based grounding system with an adhesive-based grounding system. The adhesive bond provides both mechanical attachment and electrical grounding functionality, eliminating the need for screw threads and screw head clearance that increase device thickness.
7Ease of manufacture
If a cut-out portion is formed in the cover bottom to create a bracket, then the PCB can be fixed, but light leakage occurs due to difficulty in supporting the expanded LED FPCB
Solution Approach 1:
The patent optimizes the local structure of the cover bottom at the cut part to accommodate LED FPCB expansion while preventing light leakage. The cut part is designed with specific dimensional characteristics and positioning that provide sufficient support for the expanding FPCB while maintaining light tightness through proper sealing and structural design.
Data Source
AI summary
A liquid crystal display device includes: a liquid crystal panel; a driving PCB connected to the liquid crystal panel; and a PCB fixing bracket protruding from a cover bottom disposed below the liquid crystal panel, and having a PCB accommodating portion. Owing to the PCB fixing bracket, problems such as a line defect or separation of a fixing tape that occur when a PCB is attached, may be prevented.