Sealing Frame Supporting Portion for Flexible Circuit Force Management
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Solution Overview
Problem
The assembly of a flexible printed circuit board on a sealing frame of a backlight module in liquid crystal display panels leads to uneven brightness due to force transfer, causing the cell gap to vary and resulting in the mura phenomenon.
Innovation Solution
A sealing frame design with a supporting portion in the placement slot that accommodates the flexible printed circuit board, preventing excessive pulling force and maintaining even brightness by supporting the board and distributing the force effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flexible printed circuit board is assembled on the sealing frame of the backlight module, then the liquid crystal display panel can be fixed and connected, but the flexible printed circuit board receives force and transfers it to the thin film transistor array substrate causing cell gap variation and uneven brightness (mura phenomenon)
Solution Approach 1:
The patent introduces a buffering structure (adhesive layer or independent buffering component) between the flexible printed circuit board and the thin film transistor array substrate. This intermediary absorbs and distributes the force received by the flexible printed circuit board, preventing direct force transfer to the cell gap, thereby maintaining manufacturing precision while preserving connection reliability
Solution Approach 2:
The patent applies a buffering structure in advance during the assembly process, before force is transferred to the cell gap. The buffering structure (adhesive layer with specific thickness or independent cushioning component) is pre-installed to absorb potential force variations, ensuring cell gap uniformity is maintained even when the flexible printed circuit board experiences external forces
2Ease of operation
If the flexible printed circuit board is folded and disposed on the rear surface of the backlight module, then space utilization is improved, but the flexible printed circuit board receives pulling force that causes position changes in the cell gap
Solution Approach 1:
The buffering structure acts as an intermediary between the flexible printed circuit board and the thin film transistor array substrate, absorbing pulling forces generated during folding and positioning. This prevents the flexible printed circuit board from directly affecting cell gap position, maintaining manufacturing precision while enabling flexible space utilization
Solution Approach 2:
The patent modifies the mechanical parameters of the connection interface by introducing a buffering structure with specific mechanical properties (adhesive layer thickness, cushioning component material). This changes the force transmission characteristics, allowing the flexible printed circuit board to be folded and positioned without transmitting harmful forces to the cell gap
Data Source
AI summary
The present invention provides a sealing frame, a backlight module, and a display device. A supporting portion is disposed in a first placement slot of the sealing frame configured to accommodate a flexible printed circuit board such that when the flexible printed circuit board experiences a pulling force during assembling thereof to the backlight module, supporting portion supports the flexible printed circuit board and prevents flexible printed circuit board from suffering an excessive pulling force and transferring the force to the liquid crystal display panel to result in variation of a portion of a cell gap of the liquid crystal display panel.