COF Support Pin Layout for Narrow-Bezel Display Film Cutting
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Solution Overview
Problem
The reduction of the bezel in display devices leads to increased risks of defects such as peeling-off of the end portion of the chip on film (COF) and short-circuiting due to reduced gaps between the COF and the display panel.
Innovation Solution
A device and method involving a support structure with multiple support pins and a cutting portion to manage the flexible film, ensuring proper alignment and separation of the COF, preventing defects by maintaining a narrow gap between the COF and the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the bezel of the display device is reduced to increase screen-to-body ratio, then the screen-to-body ratio is improved, but the gap between the COF and display panel is reduced causing defects such as peeling-off and short-circuiting
Solution Approach 1:
The support structure is segmented into multiple support pins (first support pins along the first edge, second support pins along the second edge, and third support pins along the third edge) that are distributed at different positions. This segmentation allows each support pin to independently manage the flexible film at its location, providing comprehensive support across the entire COF structure to prevent peeling-off and short-circuiting defects while maintaining the narrow gap required for high screen-to-body ratio
Solution Approach 2:
The support pins act as intermediary elements between the flexible film and the surrounding structure. These support pins provide mechanical support and positioning to the flexible film, preventing direct contact and potential damage between the COF end portion and the display panel, thus preventing peeling-off and short-circuiting defects while enabling the narrow gap design
2Length of moving object
If the gap between COF and display panel is reduced to achieve narrow design, then the aesthetic appearance is improved, but defects such as peeling-off and short-circuiting occur
Solution Approach 1:
The support structure is divided into multiple support pins positioned at different locations (first support pins along the first edge, second support pins along the second edge, and third support pins along the third edge). This segmentation provides distributed support points that maintain the narrow gap between the COF and display panel while preventing peeling-off and short-circuiting defects through localized mechanical support
Solution Approach 2:
The support pins serve as intermediary mechanical elements that maintain the precise narrow gap between the COF and display panel. By positioning these support pins at strategic locations, the design achieves the desired narrow gap for aesthetic appearance while the support pins prevent harmful contact that would cause peeling-off and short-circuiting defects
3Reliability
If multiple support pins are added to prevent COF defects, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The support pins are designed with multi-functionality, serving as both positioning elements and mechanical support structures. The same support pins that define the positional relationship between the COF and display panel also provide the necessary support to prevent peeling-off and short-circuiting defects, eliminating the need for separate support mechanisms and reducing overall device complexity
Solution Approach 2:
The support structure merges the positioning function and the defect prevention function into a single integrated system. The first support pins, second support pins, and third support pins work together as a unified support mechanism that simultaneously maintains the narrow gap and prevents COF end portion defects, reducing the number of separate components needed
Data Source
AI summary
A device for providing a display device, the device including a support supporting a driver of a driving film and a flexible film having edges, a jig facing the support with the flexible film and the driver therebetween, the jig including first and second edges facing and parallel to each other, a third edge orthogonal to the first and second edges, first support pins arranged along the first edge, second support pins arranged along the second edge, third support pins arranged along the third edge, and a cutting region surrounded by the first, second and third support pins, and a cutting portion which corresponds to the cutting region and separates a portion of the flexible film which corresponds to the driver from a remainder of the flexible film, to define the driving film of the display device.