Display Panel Power Trace Segmentation for Narrow Border Design
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Solution Overview
Problem
Conventional display panels face challenges in achieving a true narrow border design due to the need for a non-display region, which can lead to product reliability issues and trace breakage when bent, limiting the realization of a full-screen display design.
Innovation Solution
The display panel design includes a bending region with strategically placed power traces and connecting sub-traces within the non-display region, allowing for a significant reduction in the bottom border length to 0.8 mm to 2.0 mm, enhancing flexibility and preventing trace breakage by dispersing stress through multiple sub-traces made from materials like titanium-aluminum-titanium, molybdenum, copper, or silver nanowire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the non-display region is bent backwards to reduce border length, then the border length is reduced, but the metal traces may break or delamination may occur
Solution Approach 1:
The power trace is divided into multiple segments: a first section in the non-display region, a second section in the component disposing region, and multiple connecting sub-traces in the bending region. This segmentation allows each part to handle stress differently, preventing complete trace failure during bending
Solution Approach 2:
Different regions of the trace structure are designed with different properties: the first section has sufficient width for current carrying, the connecting sub-traces are optimized for flexibility in the bending region, and the second section connects to component pads. This local optimization ensures both electrical performance and mechanical reliability
2Length of stationary object
If the bending region is placed close to the high-potential power trace to achieve narrow border, then the border length is reduced, but delamination occurs at the high-potential power trace
Solution Approach 1:
The power trace connection is segmented into multiple sub-traces distributed across the bending region. This segmentation reduces the stress concentration on any single trace-layer interface, preventing delamination while maintaining electrical connectivity
Solution Approach 2:
The connection is extended from a single linear trace to multiple traces distributed in space. This dimensional distribution of connection points spreads the mechanical stress across multiple locations, enhancing adhesion stability during bending
Data Source
AI summary
The invention discloses a display panel including a first section of a first power trace and a second power trace, an active region and a non-display region, a bending region, and a fanout routing region and a component disposing region; the first section of the first power trace connected to a second section of the first power trace disposing within the component disposing region; and the first section of the second power trace connected to a second section of the second power trace disposing within the component placement region by at least one set of second connection sub-traces disposed within the bending region. The invention changes power line structure of the display panel, and utilizes the second connecting sub-lines for, bridging so that part of the traces can be bent to backside of the display panel, thereby achieving the bottom border of the display to have narrow borders.