Active Substrate Shift Registers for High-Speed X-Ray Scanning
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Solution Overview
Problem
Existing X-ray imaging devices with active substrates face challenges in simultaneously setting specific scan signal lines to an active state due to the limitations of gate drivers formed using amorphous silicon (a-Si) layers, which hinder high-speed scanning capabilities.
Innovation Solution
The implementation of an active substrate with multiple shift register blocks, each comprising stage-wise shift registers connected to neighboring scan signal lines, allows for simultaneous activation of multiple scan signal lines by outputting signals in a manner that ensures two or more neighboring scan signal lines are active at the same time, enabling high-speed scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a gate driver is formed by attaching from the outside in a TFT array with a-Si layer, then the TFT array can be manufactured, but the scanning speed is limited and cannot activate multiple scan signal lines simultaneously
Solution Approach 1:
The gate driver is merged with the TFT array substrate to form an integrated structure. The shift register blocks are formed using the same oxide semiconductor layer as the TFT array, eliminating the need for separate external gate drivers and enabling simultaneous activation of multiple scan signal lines through the monolithic integration.
Solution Approach 2:
The semiconductor layer material is changed from a-Si to oxide semiconductor (In-Ga-Zn-O), which fundamentally changes the electrical parameters including carrier mobility and threshold voltage characteristics. This parameter change enables the gate driver to operate at higher speeds and simultaneously drive multiple scan lines.
2Productivity
If multiple shift register blocks are used to activate multiple scan signal lines simultaneously, then scanning efficiency improves, but the device structure becomes more complex
Solution Approach 1:
The gate driver is segmented into multiple independent shift register blocks (first, second, third, and fourth blocks), each capable of independently driving adjacent scan signal lines. This segmentation allows parallel operation where multiple blocks simultaneously activate different groups of scan lines, improving scanning efficiency while maintaining manageable complexity through modular design.
Solution Approach 2:
Each shift register block is designed with universal functionality to drive scan signal lines. The blocks use the same structural design and oxide semiconductor technology, allowing them to perform identical functions of generating and outputting scan signals to their respective target scan lines, thereby simplifying the overall system through standardized multi-functional units.
3Speed
If oxide semiconductor layer is used for high mobility, then scanning performance improves, but manufacturing precision requirements increase
Solution Approach 1:
The oxide semiconductor layer is formed with uniform composition and properties across the entire substrate using consistent manufacturing processes. The In-Ga-Zn-O semiconductor layer maintains homogeneous characteristics throughout, ensuring consistent high mobility and threshold voltage across all TFTs and shift register blocks, which simplifies manufacturing by reducing the need for precise local adjustments.
Data Source
AI summary
Provided is an active substrate that is capable of performing high-speed scanning for setting specific scan signal lines to be active at the same time. Each of the shift registers (4) in an N-th stage shift register in two shift register blocks (2 and 3) outputs an out signal in such a manner that neighboring scan signal lines (GLn and GLn+1) are active at the same time.