Display Device Main Circuit Board Fixation to Rear Cover
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Solution Overview
Problem
Conventional plasma display devices face issues with bending loads and distortion due to improper fixation of holding plates, leading to assembly challenges and defects like Black Mura, especially when manufacturing tolerances are off.
Innovation Solution
A display device design where the main circuit board is fixed to a rear cover instead of the display module, using a male screw to draw the board toward the cover and secure it, reducing forces applied to the display panel and simplifying assembly by restricting movement during connection with flexible wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the holding plate is fixed to the chassis member using elastic boss portions or clips, then the holding plate is securely attached, but bending loads are generated that cause the plasma display panel to warp or distort
Solution Approach 1:
The patent extracts the harmful fixation function from the chassis member and relocates it to a dedicated support plate. The support plate is specifically designed to bear the holding plate and transmit loads away from the plasma display panel, thereby separating the fixation function from the panel support function and eliminating the warping problem.
Solution Approach 2:
The support plate acts as an intermediary component between the chassis member and the holding plate. It receives the holding plate and distributes the fixation loads to the chassis member through multiple contact points, preventing concentrated forces from warping the plasma display panel while maintaining secure attachment.
2Strength
If screws are used to fix the holding plate to the rear cover from the inside, then the fixation is secure, but the assembling operation becomes very difficult when FPCs are used to connect the display panel and holding plate
Solution Approach 1:
Instead of fixing the holding plate to the rear cover from the inside (which requires manipulating screws through the rear cover), the patent inverts the approach by using elastic boss portions that protrude from the chassis member to engage with the holding plate from the outside. This allows assembly to proceed in a more logical sequence without interfering with FPC connections.
Solution Approach 2:
The patent applies preliminary action by pre-forming elastic boss portions on the chassis member that are designed to engage with the holding plate. These elastic bosses are prepared in advance with appropriate elasticity and geometry, allowing the holding plate to be easily snapped into place without requiring complex assembly operations after the FPC connections are made.
3Manufacturing precision
If the spacing between elastic boss portions is smaller than the spacing between openings due to manufacturing error, then the fixation is tighter, but bending loads increase that cause the rear surface of the chassis member to warp
Solution Approach 1:
The patent changes the physical parameters of the elastic boss portions by designing them with specific elasticity and deformability characteristics. This allows the boss portions to deform and adapt to manufacturing tolerances in the spacing between openings, maintaining uniform load distribution and preventing chassis warping even when the spacing varies within acceptable ranges.
Solution Approach 2:
The elastic boss portions introduce dynamics to the fixation system by allowing deformation and adjustment during assembly. The elastic material enables the boss portions to flex and adapt to slight variations in opening spacing, automatically compensating for manufacturing errors and maintaining optimal load distribution without causing warping.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design minimizes distortion of the display panel, prevents defects like Black Mura, and facilitates easier assembly by reducing unnecessary forces and allowing for shorter flexible wiring connections.
Implementation Method 1
two elastic boss portions provided on the chassis member are inserted into two openings formed in the holding plate while the elastic boss portions are deformed so as to be contracted
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A display device includes a display module, a rear cover that covers the rear surface of the display module, a main circuit board placed in an internal space formed between the rear cover and the rear surface of the display module, flexible wiring members that mutually connects the display module and the main circuit board, and a male screw having a head exposed to the outside of the rear cover, the male screw passing through the rear cover and engaging a female screw formed in the main circuit board. The main circuit board is fixed to the rear cover with the male screw in a state in which the main circuit board is not fixed to the display module.