Shift Register Unit With Auxiliary Circuit For Defect Compensation
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Solution Overview
Problem
In flat panel display devices, shift register units with thin film transistors (TFTs) and storage capacitors are prone to defects, leading to failure of the shift function and improper display.
Innovation Solution
A shift register unit design that includes an input circuit, pull-up circuit, output circuit, auxiliary circuit, and pull-down circuit, with storage capacitors and switching elements to ensure signal transmission and maintain proper function even if individual components fail, using a cascade-connected configuration for the gate drive circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional shift register units with TFTs and storage capacitors are used, then the device complexity is reduced, but the reliability deteriorates due to component defects
Solution Approach 1:
The patent introduces an auxiliary circuit with a second storage capacitor that is activated only when the first storage capacitor fails. This compensatory mechanism is designed in advance to cushion against potential defects, ensuring the shift function continues to operate reliably without requiring complete circuit redesign.
Solution Approach 2:
The auxiliary circuit acts as an intermediary between the defective first storage capacitor and the rest of the shift register system. When the first storage capacitor fails, the auxiliary circuit mediates by taking over its function through the second storage capacitor, allowing the system to maintain operation despite component failure.
2Reliability
If multiple storage capacitors and auxiliary circuits are added to compensate for defects, then the reliability improves, but the device complexity increases
Solution Approach 1:
The auxiliary circuit is designed with multi-functionality to minimize complexity. The second storage capacitor can serve as either a backup when the first storage capacitor fails or as an active component in the signal transmission path. This universal design allows the same circuit structure to handle both normal operation and defect compensation scenarios.
Solution Approach 2:
The circuit employs self-service mechanisms where the auxiliary circuit automatically activates when defects are detected in the primary storage capacitor. The system monitors its own operational status and self-corrects by switching to the compensatory path without requiring external intervention, thereby managing the increased complexity through autonomous operation.
3Reliability
If a conventional single-path signal transmission is used, then the device complexity is low, but the reliability worsens when TFTs or storage capacitors fail
Solution Approach 1:
The signal transmission path is segmented into multiple independent routes. The first storage capacitor handles normal signal transmission, while the second storage capacitor in the auxiliary circuit provides an alternative segment. This segmentation allows the system to isolate and compensate for defects in one segment without affecting the entire transmission path.
Solution Approach 2:
The circuit configuration is made dynamic by enabling switching between the primary and auxiliary signal transmission paths. When the first storage capacitor is defective, the system dynamically reconfigures to use the second storage capacitor, transforming a static single-path design into a flexible multi-path system that adapts to operational conditions.
Data Source
AI summary
The present disclosure relates to the field of display technologies and provides a shift register unit. The shift register unit includes an input circuit, a pull-up circuit, an output circuit, an auxiliary circuit, a pull-down circuit, a first storage capacitor, and a second storage capacitor. The auxiliary circuit is coupled to a first clock signal terminal, a second clock signal terminal, an input terminal and a first output terminal. The second storage capacitor is coupled between a first node and a pull-up node.