Display Panel Bridging Terminals for Reliable Bezel-Free Bonding
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Solution Overview
Problem
Current bezel-free splicing display technology faces issues with poor connection between display screens and the motherboard due to damage from laser drilling, leading to compromised electrical contact and display quality.
Innovation Solution
The solution involves a display panel design with a driving backplate and display substrates where first openings are defined in the bonding regions, allowing bridging terminals to connect the bonding terminals directly to the driving backplate, reducing contact impedance and improving reliability through an auxiliary conductive layer and bridging terminal configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser drilling is used to remove film layers under bonding terminals to expose them completely, then bonding terminals can be fully exposed for bonding, but the bonding terminals are damaged due to long-time laser drilling, resulting in poor connection
Solution Approach 1:
The patent divides the bonding terminal structure into multiple parts: the bonding terminal body, the bridging terminal extending into the opening, and the auxiliary conductive layer. This segmentation allows the bonding terminal to maintain its integrity while achieving complete exposure through the opening, avoiding damage from laser drilling while ensuring full electrical connection.
Solution Approach 2:
The patent extends the bonding terminal in a vertical dimension by adding a bridging terminal that protrudes from the surface of the display substrate into the opening. This dimensional extension ensures that the bonding terminal is fully exposed for bonding without requiring aggressive removal of underlying film layers that could cause damage.
2Device complexity
If conventional bonding terminal structure is used, then the structure is simple, but the contact impedance between bonding terminals and driving backplate is high, resulting in poor electrical connection
Solution Approach 1:
The auxiliary conductive layer acts as an intermediary between the bonding terminal and the driving backplate. It fills the opening and provides additional conductive pathways, reducing contact impedance and improving electrical connection reliability without significantly complicating the overall structure.
Solution Approach 2:
The patent uses a composite structure combining the bonding terminal material, the bridging terminal material, and the auxiliary conductive layer material. This composite approach creates multiple parallel conductive paths, reducing overall contact impedance while maintaining structural integrity.
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a driving backplate and a plurality of display substrates. At least one first opening is defined in a first base and a first bonding terminals of the display substrates, the first opening penetrates the first base and the first bonding terminals, a bridging terminal is disposed in the first opening, the bridging terminal is electrically connected to a lateral surface of the first bonding terminals, so that a problem of poor connection between a display screen and a motherboard existing in current bezel-free splicing display technology is relieved.