Shift Register Unit Noise Reduction via Pulling-Down Enhancement
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Solution Overview
Problem
Existing shift register units for liquid crystal display panels can only partially remove noise from the output signal during operational periods, leading to errors and potential safety issues due to the signal being in a floating state during other times.
Innovation Solution
A shift register unit comprising a first capacitor, input buffering, pulling-up, reset control, and pulling-down modules, along with a pulling-down enhancement module, which pre-charge and discharge the capacitor to continuously reduce noise levels during specific phases, ensuring signal stability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shift register unit uses traditional noise removal method during operational periods, then noise is partially removed during active phases, but the output signal remains in a floating state during inactive phases causing large noise and errors
Solution Approach 1:
The patent applies preliminary action by introducing a pulling-down enhancement module that actively discharges the first capacitor during inactive phases before the signal enters a floating state. This preliminary discharge action prevents the accumulation of noise that would otherwise occur during idle periods, ensuring the output signal remains stable and ready for the next operational phase.
Solution Approach 2:
The patent implements continuity of useful action by extending the noise removal function beyond operational periods. The pulling-down enhancement module ensures continuous noise removal during both active and inactive phases, eliminating the gap where traditional methods left the signal in a noisy floating state. This continuous action maintains signal integrity throughout the entire operational cycle.
2Reliability
If the first capacitor is not continuously discharged, then the circuit maintains simplicity, but noise accumulates during inactive phases causing error output signals
Solution Approach 1:
The patent uses an intermediary approach by introducing the pulling-down enhancement module as a mediator between the first capacitor and the output terminal. This intermediate component specifically addresses the noise accumulation problem during inactive phases without requiring a complete redesign of the entire circuit, thus improving reliability with minimal added complexity.
Solution Approach 2:
The patent applies local quality by targeting the specific problem area (noise accumulation at the first capacitor during inactive phases) with a dedicated pulling-down enhancement module. Rather than complicating the entire circuit, the solution locally enhances the discharge function where it is most needed, maintaining overall circuit simplicity while improving output signal accuracy.
Data Source
AI summary
There is provided a shift register unit and driving method for the shift register unit, a shift register and a display device. The shift register unit comprises a first capacitor (C1), an input buffering module (31), a pulling-up module (32), a reset control module (33), a pulling-down module (34) and a pulling-down enhancement module (35); the pulling-down module (34) is configured to reduce the level at the signal output terminal (OUTPUT) and discharge the first capacitor (C1) during a first noise-removal phase; the pulling-down enhancement module (35) is configured to control, in cooperation with the pulling-down module (34), to continuously reduce the level at the signal output terminal (OUTPUT) and continuously discharge the first capacitor (C1) during a second noise-removal phase. Noise in the output signals of the shift register can be reduced and reliability of the shift register can be improved.