Shift Register Unit Switch for Noise Reduction
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Solution Overview
Problem
Existing shift register designs in flat panel displays generate noise at the output of next stage shift register units due to the presence of capacitors, which affects the scanning signal integrity.
Innovation Solution
Incorporating a switch between the capacitor and the output terminal, which is turned off when the capacitor is charged, to prevent noise coupling and improve signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitor is connected with the outputting terminal OUTPUT to provide an output signal, then the shift register unit can maintain signal levels and perform resetting functions, but noise is generated at the output due to the capacitor when the shift register unit is in the first control state
Solution Approach 1:
The patent extracts the noise-generating component (capacitor C1) from the direct signal path by introducing a switching element that isolates the capacitor from the output terminal during specific operating states. This allows the capacitor to maintain its signal-holding function while preventing it from coupling noise to the output.
Solution Approach 2:
The patent introduces a switching element as an intermediary between the capacitor and the output terminal. This mediator controls the connection state dynamically, enabling the capacitor to perform its resetting function when needed while blocking noise transmission during normal operation.
2Adaptability or versatility
If the shift register units are layered and connected in cascade to achieve progressive scanning, then the scanning signal can be distributed to multiple gate lines, but noise from previous stage outputs affects next stage outputs
Solution Approach 1:
The patent segments the shift register unit into functionally independent modules by introducing switching elements that isolate different operational states. This segmentation allows each stage to operate independently without noise coupling to adjacent stages, while maintaining the cascade connection for progressive scanning.
Solution Approach 2:
The patent makes the connection between the capacitor and output terminal dynamic through the use of controllable switching elements. The switching state changes based on the operational mode, allowing the system to adapt between signal holding and noise isolation as needed for proper cascade operation.
Data Source
AI summary
A shift register unit, a gate driving circuit, an array substrate and a display apparatus are disclosed to reduce noises generated at an output of a next stage shift register unit caused by an output of a pervious stage shift register unit. The shift register unit at each stage comprises at least a signal inputting terminal INPUT, a signal outputting terminal OUTPUT and a capacitor CAP connected with the outputting terminal OUTPUT so as to provide an output signal to the outputting terminal OUTPUT, wherein the shift register unit further comprises a switch located between the capacitor CAP and the outputting terminal OUTPUT, and the switch is in a turned-off state when the capacitor CAP is charged.