Flexible PCB Width Variation for Curved Display Tension
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing curved display apparatuses face damage issues with flexible printed circuit boards (PCBs) and driving chips when bent, due to tension and edge interference, which affects the reliability and lifespan of the device.
Innovation Solution
The design incorporates a flexible PCB with a wider upper or lower end portion than the center portion, a biased and offset driving chip position, and oblique connections to reduce tension and prevent damage, along with cut portions and separation members to mitigate friction and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flexible PCB is bent to connect the display panel and source printed circuit board, then the display apparatus can be formed with a curved surface enabling broad viewing range, but the flexible PCB may be torn by tension applied during bending
Solution Approach 1:
The flexible PCB is designed with non-uniform width where the end portion has a greater width than the center portion. This local variation in geometry distributes the tension differently during bending, with the wider end portion accommodating higher stress concentrations, thereby preventing tearing while maintaining the curved surface capability
Solution Approach 2:
The width parameter of the flexible PCB is changed along its length to optimize performance. By increasing the width at the end portion compared to the center portion, the structural parameters are adjusted to better withstand the tension forces generated during bending operations
2Ease of operation
If the flexible PCB is bent, then the source printed circuit board can be positioned on the rear side of the display panel, but the driving chip may be damaged by the edges of the bottom chassis
Solution Approach 1:
The driving chip is positioned asymmetrically on the flexible PCB, offset from the center toward one end. This asymmetric placement ensures that during bending, the driving chip is located in a region with lower stress and away from potential interference with bottom chassis edges, protecting it while enabling proper component positioning
3Ease of manufacture
If the flexible PCB has uniform width, then manufacturing is simplified, but tension distribution during bending is uneven causing potential damage
Solution Approach 1:
Rather than maintaining uniform width throughout, the flexible PCB incorporates a local variation where the end portion is wider than the center portion. This localized geometric modification optimizes tension distribution during bending without significantly complicating the overall manufacturing process
Data Source
AI summary
Disclosed herein is a display apparatus that reduces a magnitude of a tension applied to a flexible PCB when a display panel is provided with a curved surface, and prevents damage of a driving chip. The display apparatus in accordance with exemplary embodiments includes a display panel configured to display an image, a source printed circuit board configured to control the display panel, and a flexible PCB that connects the display panel and the source printed circuit board. A length of at least one side edge of the flexible PCB is formed longer than a minimum length from the display panel to the source printed circuit board.