Shift Register Noise Reduction via Switching Modules
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Solution Overview
Problem
In Thin Film Transistor Liquid Crystal Displays, noise interference occurs during the non-operating time of shift registers due to the absence of a pulling-down transistor, leading to increased noise levels at the signal output terminal.
Innovation Solution
The integration of two electronic switching modules, one between the pulling-up node and the low level signal terminal, and another between the pulling-down node and the signal output terminal, which are activated during the non-operating time to discharge noise voltage and maintain the nodes at a low level, effectively reducing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the shift register operates without additional switching modules during non-operating time, then the device complexity is low, but noise interference increases at the signal output terminal
Solution Approach 1:
The shift register circuit is segmented by adding independent switching modules (fifth TFT M5 and sixth TFT M6) that operate separately from the main signal path. These modules are activated only during non-operating time to pull down noise voltage at the pulling-up node and signal output terminal, thus reducing noise interference without affecting the main signal transmission function
Solution Approach 2:
The switching modules are activated in advance during non-operating time before the next signal cycle begins. By preemptively pulling down the voltage at the pulling-up node and signal output terminal, the circuit prevents noise accumulation and ensures clean signal levels are ready for the next operating cycle, thus reducing noise interference proactively
2Object-affected harmful factors
If electronic switching modules are added to reduce noise, then noise interference is reduced, but the manufacturing complexity increases
Solution Approach 1:
The fifth TFT M5 and sixth TFT M6 are designed with multi-functionality: they serve as switching modules for noise reduction during non-operating time, while also functioning as part of the overall signal control mechanism. Their gates are controlled by the same input signal terminal, integrating them into the existing control structure and simplifying the manufacturing process by reusing control signal routing
3Reliability
If the shift register uses the conventional four-TFT structure, then the device complexity is low, but the signal output stability deteriorates during non-operating time
Solution Approach 1:
The fifth TFT M5 acts as an intermediary element between the pulling-up node and the low level signal terminal during non-operating time. It mediates the voltage level at the pulling-up node by providing a controlled discharge path to ground, preventing voltage drift and ensuring stable baseline levels for the next signal cycle, thus improving signal output stability
Data Source
AI summary
A shift register an integrated gate line driving circuit, an array substrate and a display are disclosed. Two electronic switching modules are added to the existing shift register, wherein one of the two electronic switching modules is arranged among a puling-down node, a low level signal terminal and a pulling-up node, and the other is arranged among the pulling-down node, the low level signal terminal and a signal output terminal; during the non-operating time of the shift register and when the pulling-down node is at a low level, the two electronic switching modules are turned on, and discharge the pulling-up node and the signal output terminal respectively to pull down the noise voltage, thereby effectively reducing the noise interference of the shift register during the non-operating time.