Display Panel Dual Bonding Region Corrosion Protection
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Solution Overview
Problem
The bonding region in display devices experiences corrosion issues due to bare metal cross-sections of connection terminals, leading to defects such as short circuits, which affect the bonding effect and yield, especially in flexible printed circuit regions on polyimide substrates.
Innovation Solution
A display panel design with a dual bonding region structure, featuring first and second bonding regions with specific insulating layers and openings to protect the connection terminals' side surfaces from corrosion, ensuring they are not exposed to corrosive elements and maintaining a suitable height difference for effective bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a double-layer source and drain electrode process is used on the backplane, then the laminated structure of the display device is enhanced, but the bonding region becomes more complex and susceptible to corrosion
Solution Approach 1:
The bonding region is divided into a first bonding region and a second bonding region, with different structural configurations for each. The first bonding region uses a through-hole penetrating the first insulating layer to expose the first electric connecting structure, while the second bonding region uses an opening in the second insulating layer to expose the second electric connecting structure. This segmentation allows the complex laminated structure to be managed in discrete, controllable sections.
Solution Approach 2:
The patent introduces multiple insulating layers (first insulating layer and second insulating layer) stacked in the vertical dimension, creating a multi-layer protective structure. The through-hole and opening provide vertical access paths through these layers, allowing electrical connections to be established while maintaining lateral protection against corrosion.
2Ease of operation
If connection terminals are exposed in the bonding region, then bonding connections can be established, but the bare metal cross-section becomes susceptible to sideways corrosion
Solution Approach 1:
The first insulating layer and second insulating layer act as protective thin film structures that wrap around and protect the electric connecting structures. These insulating layers provide a barrier against corrosive elements while allowing the necessary electrical connections to be made through controlled openings and through-holes.
Solution Approach 2:
The insulating layers serve as intermediary protective structures between the corrosive environment and the metal connection terminals. The controlled openings and through-holes in these insulating layers allow electrical connections to pass through while the insulating material itself acts as a mediator that prevents sideways corrosion of the metal structures.
3Productivity
If metal ions precipitate due to corrosion, then bonding yield is affected, but short circuits in the display region occur
Solution Approach 1:
The first insulating layer and second insulating layer are applied in advance to protect the electric connecting structures from corrosion before any metal ion precipitation can occur. The controlled openings and through-holes are formed through these insulating layers to expose only the necessary portions for bonding, preventing sideways corrosion and subsequent metal ion precipitation that would harm bonding yield and cause short circuits.
Data Source
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AI summary
The present disclosure relates to the field of display, and discloses a display panel and a display device. The display panel includes: a base substrate including a first bonding region and a second bonding region; connection terminals located in the bonding regions and including first electric connecting structures and second electric connecting structures which are sequentially stacked, and particularly including first connection terminals and second connection terminals which are respectively located in the first bonding region and the second bonding region; a first insulating layer located between the first electric connecting structures and the second electric connecting structures, not overlapping the first connection terminals, and provided with first openings corresponding to the second connection terminals, a projection of each first opening being disposed within a projection of the corresponding first electric connecting structure, and the first electric connecting structures and the second electric connecting structures of the second connection terminals being connected through the first openings; and a second insulating layer located on one sides, facing away from the base substrate, of the second electric connecting structures, and provided with second openings corresponding to the connection terminals, and a projection of each second opening being located within a projection of the second electric connecting structure of the corresponding connection terminal.