Stretchable Display Gate Driver Inspection in Limited Border Area
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Solution Overview
Problem
Stretchable display devices face challenges in detecting defects in gate drivers, particularly due to limited space for incorporating inspection circuits, which affects reliability and functionality.
Innovation Solution
A stretchable display device design that includes an inspection unit with a minimized configuration, utilizing a specific arrangement of substrates and connection lines to inspect gate signals from the uppermost and lowermost stages of the gate driver, allowing for defect detection within a limited area without requiring extensive additional rigid substrates or connection lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inspection unit is added to detect gate driver defects, then reliability is improved, but device complexity increases
Solution Approach 1:
The inspection unit is merged with the existing substrate structure by utilizing the lower substrate's non-display area. The inspection substrates are integrated into the same physical platform as the display and gate driver components, eliminating the need for separate inspection hardware and reducing overall device complexity while maintaining defect detection capability.
Solution Approach 2:
Connection lines serve as intermediaries that transmit gate signals from the gate driver stages to the inspection patterns. These existing connection structures act as mediators between the functional components and inspection elements, enabling defect detection without requiring complex dedicated inspection pathways.
2Reliability
If inspection circuits are incorporated into the stretchable display device, then defect detection capability is improved, but the available area is reduced
Solution Approach 1:
The inspection patterns are localized to specific regions of the lower substrate, particularly utilizing the non-display areas. This local placement strategy allows inspection functionality to be concentrated in areas where it is most needed while leaving the display area and other functional regions unaffected, thus minimizing the impact on overall device area.
Solution Approach 2:
The inspection unit utilizes the vertical dimension by stacking inspection substrates above the lower substrate in the non-display area. This three-dimensional arrangement allows inspection functionality to be added without significantly increasing the planar footprint of the device, effectively using the Z-dimension to accommodate inspection circuits.
3Ease of manufacture
If a minimized inspection unit configuration is used, then ease of manufacture is improved, but measurement precision may be reduced
Solution Approach 1:
The inspection unit focuses on monitoring critical gate signals from specific stages (uppermost and lowermost) rather than attempting to inspect all gate signals comprehensively. This partial inspection approach targets the most critical failure points in the gate driver, providing sufficient defect detection capability while maintaining a simplified, manufacturable structure.
Solution Approach 2:
The inspection patterns utilize the existing gate signal transmission pathways and connection structures to perform self-inspection. The gate driver's own output signals are routed through inspection patterns that leverage the existing electrical infrastructure, eliminating the need for separate test signal generation circuits and simplifying manufacturing while maintaining inspection effectiveness.
Data Source
AI summary
A stretchable display device according to one or more embodiments of the present disclosure includes a lower substrate including a display area, a first non-display area disposed at a left side and a right side of the display area, and a second non-display area disposed above and below the display area and the first non-display area, a plurality of first substrates disposed on the lower substrate in the display area and defining a plurality of pixels, a plurality of second substrates disposed on the lower substrate in the first non-display area and including a gate driver disposed thereon, and an inspection unit disposed on the lower substrate in the second non-display area and including a plurality of inspection substrates connected to a second substrate which is the most adjacent to the second non-display area among the plurality of second substrates.