Shift Register Noise Reduction Module for TFT-LCD Stability
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Solution Overview
Problem
Traditional shift registers in TFT-LCDs face issues with noise at the output terminal, leading to instability and reduced service life, particularly due to complex circuit designs and poor performance of amorphous silicon transistors.
Innovation Solution
A shift register design incorporating an input module, pull-up module, pull-up control module, output module, and noise reducing module, where the noise reducing module maintains a stable node level to eliminate output terminal noise, and a gate driving circuit with multiple shift registers connected in series to enhance stability and reduce transistor count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional amorphous silicon transistors are used in shift register circuits, then the display driving circuits become relatively complex and performance stability deteriorates, but using low-temperature poly-silicon transistors improves stability and simplifies circuits
Solution Approach 1:
The patent changes the material parameter of the transistor from amorphous silicon to low-temperature poly-silicon, which fundamentally alters the electrical characteristics and stability of the shift register circuit. This material parameter change enables both improved performance stability and circuit simplification simultaneously.
2Reliability
If traditional shift register designs are used, then noise at the output terminal increases and working stability deteriorates, but adding a noise reducing module eliminates noise and extends service life
Solution Approach 1:
The patent extracts and separates the noise reduction function into an independent noise reducing module that is connected to specific nodes in the shift register. This modular approach allows noise elimination without completely redesigning the entire circuit, thereby improving working stability while controlling the increase in device complexity.
3Duration of action of stationary object
If more transistors are added to reduce noise and improve stability, then service life extends and noise reduces, but the transistor count increases and manufacturing complexity rises
Solution Approach 1:
The patent segments the shift register circuit into distinct functional modules (input module, output module, pull-up module, noise reducing module), each with specific transistor assignments. This segmentation allows for optimized transistor placement and reduces overall manufacturing complexity while achieving the desired service life extension through improved noise performance.
Data Source
AI summary
A shift register and an operation method thereof as well as a gate driving circuit and a display device. The shift register includes The shift register includes an input module, a pull-up module, a pull-up control module, an output module, and a noise reducing module. It can reduce noises at the output terminal effectively.