Curved Display PCB Layout for Chip-on-Film Stress Relief
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Solution Overview
Problem
Curved display apparatuses apply concentrated stress on chip-on-films and printed circuit boards due to curvature, leading to potential damage.
Innovation Solution
The display apparatus is designed with a specific arrangement of chip-on-films and printed circuit boards, where the number of chip-on-films connected to different PCBs varies, and the PCBs are separated at points of high curvature deformation to distribute stress evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the display apparatus is designed with curvature, then the display module achieves a curved shape for aesthetic and functional purposes, but concentrated stress is applied on the chip-on-films and connected PCBs
Solution Approach 1:
The patent divides the previously single PCB into multiple separate PCBs (first PCB, second PCB, third PCB) positioned at different locations. This segmentation allows each PCB to independently support specific chip-on-films, distributing the stress caused by curvature across multiple components rather than concentrating it on a single PCB, thereby resolving the contradiction between achieving curved shape and reducing stress concentration.
2Stress or pressure
If multiple PCBs are used to distribute stress, then stress concentration is reduced, but the device complexity increases
Solution Approach 1:
The patent applies local quality by positioning each PCB at specific locations where chip-on-films are connected to the display panel. The first PCB supports chip-on-films at a first location, the second PCB supports chip-on-films at a second location, and the third PCB supports chip-on-films at a third location. This localized arrangement ensures that each PCB handles stress only in its specific region, achieving effective stress distribution while maintaining a relatively simple and organized device structure.
Data Source
AI summary
A display apparatus includes a display panel having a curvature, a plurality of chip-on-films connected to a side of the display panel, a first printed circuit board (PCB) connected to a first part of the plurality of chip-on-films, and a second PCB provided farther outside of the display panel than the first PCB from a center of the display panel, the second PCB being connected to a second part of the plurality of chip-on-films, and a number of chip-on-films of the second part of the plurality of chip-on-films is different than a number of chip-on-films of the first part of the plurality of chip-on-films.