Display Panel Rigid Underlay Corner Design for COF Bending
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Solution Overview
Problem
Current display technologies face limitations in reducing the size of the non-display region surrounding the display panel, particularly in mobile devices, due to the large bending protrusion of the chip on film (COF) after bending, which restricts the increase of the screen-to-body ratio.
Innovation Solution
A display panel design featuring a rigid underlay with a rounded or chamfered angle between its surfaces, allowing a flexible circuit board to be seamlessly attached, reducing the bending protrusion and eliminating gaps, thereby minimizing the non-display region and enhancing the screen-to-body ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the COF is bent to increase the screen-to-body ratio, then the screen-to-body ratio is improved, but the bending protrusion size increases causing the border region to remain large
Solution Approach 1:
The rigid underlay's corner is designed with a rounded angle or chamfered angle instead of a sharp right angle. This curved transition allows the COF to bend more smoothly and compactly, reducing the bending protrusion size while maintaining the increased screen-to-body ratio. The curvature eliminates the gap that would otherwise exist at the corner, enabling the COF to be bound more closely to the underlay surface.
2Reliability
If the COF is bent to bind to the backlight side, then the driving circuit can be connected, but the large border region limits further screen-to-body ratio increase
Solution Approach 1:
The rounded or chamfered corner design enables the COF to bend into a tighter radius, reducing the protrusion into the border region. This allows the driving circuit connection to be maintained while minimizing the border region size, thereby enabling further increase of the screen-to-body ratio.
3Ease of manufacture
If the rigid underlay has a right angle between surfaces, then manufacturing is simple, but gaps form when COF is bent reducing reliability
Solution Approach 1:
The rounded angle or chamfered angle replaces the sharp right angle, providing a smooth transition surface for the COF to bend along. This eliminates gaps and voids that would form at the corner, improving the attachment reliability and ensuring complete folding of the COF without compromising manufacturing feasibility.
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a rigid underlay and a flexible circuit board. The rigid underlay includes: a first surface including connection pins, and a second surface. The flexible circuit board includes a first flat portion, a bending portion, and a second flat portion. The bending portion is located between the first and second flat portions. The first flat portion contacts with the first surface. The bending portion is attached to the second surface. The second flat portion is positioned at a side of the rigid underlay facing away from the first surface with the bending portion bended. The first flat portion is electrically connected to the connection pins. The second flat portion includes a driving circuit connected to the connection pins through the flexible circuit board. An angle between the first and second surfaces is a rounded or chamfered angle.