Display Device Scan Driver Segmentation and Wire Routing
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Solution Overview
Problem
Existing display devices face challenges in reducing defect rates while effectively driving pixel areas of various shapes, as existing technologies struggle to manage the separation and driving of scan lines and signals efficiently across multiple pixel areas.
Innovation Solution
A display device design featuring separate pixel areas with distinct scan lines and drivers, connected by wires and connecting wires, allowing for effective signal transmission and reduced defect rates through a method of fabricating the device that includes forming test pads and performing tests before the scribing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pixel areas are spaced apart to allow separate scan lines, then scan line management is improved, but device area increases
Solution Approach 1:
The display device divides pixel areas into multiple separate regions (first pixel area, second pixel area, third pixel area) with corresponding separate scan lines and scan drivers. This segmentation allows independent control and management of each pixel area, improving manufacturing ease by enabling separate scan line routing and driver placement in distinct non-pixel areas.
Solution Approach 2:
The patent utilizes the non-pixel areas (peripheral regions) in the lateral dimension to place scan drivers and routing wires. By extending the device area in the non-display region, the patent accommodates multiple scan drivers and connecting wires without increasing the active pixel area, thus resolving the area contradiction.
2Adaptability or versatility
If multiple scan drivers are used for separate pixel areas, then driving capability is improved, but device complexity increases
Solution Approach 1:
The patent employs multiple scan drivers (first scan driver, second scan driver, third scan driver, fourth scan driver) each dedicated to specific pixel areas. This segmentation of driving functions enhances adaptability by allowing independent control of different pixel regions, while the modular architecture manages complexity through standardized driver designs.
Solution Approach 2:
The scan drivers are designed with universal functionality to handle multiple pixel areas. For example, the first scan driver can drive both the first pixel area and third pixel area through shared scan lines, reducing the total number of drivers needed while maintaining versatile driving capability across different pixel configurations.
3Reliability
If connecting wires are added to link pixel areas, then signal transmission is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent incorporates test pads in non-pixel areas before the scribing process to enable preliminary testing of connecting wires and signal transmission paths. This preliminary action allows detection and correction of alignment issues before final device completion, improving signal transmission reliability while managing manufacturing precision requirements through early verification.
Solution Approach 2:
The non-pixel areas serve as intermediary zones that house connecting wires and test pads. These intermediary regions provide buffer space for wire routing and alignment adjustment, reducing the precision burden on critical pixel area connections while ensuring reliable signal transmission between separated pixel areas.
4Reliability
If test pads are formed before scribing, then defect detection is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent forms test pads in non-pixel areas before the scribing process to enable preliminary electrical testing of the display device. This preliminary action allows defect detection in pixel areas and connecting structures before final separation, improving reliability through early quality assurance while adding a controlled step to the manufacturing process.
Solution Approach 2:
The test pads are extracted and placed in dedicated non-pixel areas separate from the pixel areas. This extraction allows independent testing of signal transmission and driver functionality without interfering with pixel area operations, improving defect detection capability while managing process complexity through spatial separation of testing functions.
Data Source
AI summary
A display device includes first and second pixel areas spaced apart from each other so that corresponding scan lines are separate from each other, a first non-pixel area at a periphery of the first pixel area, a second non-pixel area at a periphery of the second pixel area and opposite to the first non-pixel area with at least one pixel area interposed therebetween, first scan lines in the first pixel area, second scan lines in the second pixel area, a first scan driver in the first non-pixel area and connected to the first scan lines, a second scan driver in the second non-pixel area and connected to the second scan lines, first wires in the first non-pixel area and connected to the first scan driver, second wires in the second non-pixel area and connected to the second scan driver; and connecting wires connecting the first wires and second wires.