Bendable AMOLED Display Substrate With Protected Signal Extension
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Solution Overview
Problem
Current display substrates for Active Matrix Organic Light-Emitting Diode (AMOLED) displays face challenges in efficiently integrating driving and detection signal lines, leading to complex manufacturing processes and increased costs due to the need for multiple protection layers and precise patterning.
Innovation Solution
The display substrate design includes a bendable extension part with a conductive structure featuring a lower and upper part stacked perpendicular to the substrate, where the upper part acts as a protection layer, simplifying the manufacturing process by eliminating the need for additional protection layers and allowing for direct contact with the lower part, thereby reducing resistance and enhancing signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detection lead wire is extended to the extension part through the bending region, then the detection signal can be provided to the driving signal line, but the lead wire is vulnerable to damage during bending
Solution Approach 1:
The detection lead wire is nested within the protection part (conductive structure) that extends from the non-display region to the extension part. The protection part surrounds and shields the lead wire, providing mechanical protection during bending while maintaining electrical connection between the lead wire and driving signal line.
Solution Approach 2:
The protection part serves as an intermediary structure between the detection lead wire and the external bending forces. It absorbs and distributes the mechanical stress, protecting the lead wire from direct damage while still allowing the lead wire to transmit detection signals to the driving signal line.
2Reliability
If additional protective layers are added to protect the conductive structures during bending, then the reliability during bending is improved, but the device complexity and manufacturing process are worsened
Solution Approach 1:
The conductive structure (protection part) is designed to serve multiple functions simultaneously: it provides mechanical protection to the detection lead wire during bending, maintains electrical connection between the lead wire and driving signal line, and integrates with the existing substrate and insulation layer structure. This multi-functionality reduces the need for separate protective layers.
Solution Approach 2:
The protection part is merged with the conductive structure that is already part of the display substrate architecture. By combining the protective function with the existing conductive elements, the design avoids adding separate protective layers, thereby reducing device complexity while maintaining bending reliability.
3Reliability
If the upper part of the conductive structure directly contacts the lower part through the opening, then the electrical connection is improved, but the risk of short circuit with surrounding conductors is increased
Solution Approach 1:
The first insulation layer serves as an intermediary between the upper part and lower part of the conductive structure. It provides electrical insulation while containing an opening that allows controlled direct contact between the upper and lower parts at the specific location needed for electrical connection, preventing short circuits with surrounding conductors.
Solution Approach 2:
The insulation structure has different properties at different locations: the first insulation layer provides electrical insulation in most areas, but contains a localized opening where direct contact between upper and lower parts is permitted. This local variation in insulation quality enables reliable electrical connection where needed while preventing short circuits elsewhere.
Data Source
AI summary
A display substrate and a manufacturing method thereof, and a display apparatus, in the display substrate, the substrate includes a bendable part at an edge of the non-display region away from the display region; the display substrate has a first side and a second side, the extension part is connected with the bendable part and is bent to the second side of the display substrate through the bendable part; at least a part of the first insulation layer is located in the extension part and the first insulation layer includes an opening; the electrically conductive structure is located in the extension part and includes a lower part and an upper part; the opening exposes the lower part; the upper part is on a side of the lower part away from the substrate, located in the opening and is in direct contact with the lower part.