Shift Register Denoising Module for Signal Stability
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Solution Overview
Problem
The stability of shift register transmission signals is compromised by sharp spikes generated due to the coupling effect of capacitors, leading to increased noise and instability in signal output, affecting the display quality of flat panel displays.
Innovation Solution
Incorporating a denoising module in the shift register circuit, which includes an N-type or P-type transistor, to prevent spikes by cutting off the path for the coupling effect of the capacitor, ensuring stable interstage shift transmission signals and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a bootstrap capacitor is used to pull up the transmission signal in the shift register, then the signal level can be boosted to high level, but sharp spikes and noise are generated due to the coupling effect when the voltage jumps
Solution Approach 1:
The patent introduces a denoising module as an intermediary component between the capacitor and the transmission signal output terminal. This module includes a control transistor that is activated during the pull-down stage to block the coupling path, preventing the capacitor's voltage jump from coupling into the transmission signal and generating noise, while allowing the capacitor to function normally during the pull-up stage.
2Device complexity
If the shift register uses a simple pull-up and pull-down structure, then the circuit complexity is low, but the transmission signal stability is poor due to coupling effects
Solution Approach 1:
A denoising module is introduced as an intermediary component between the capacitor and the transmission signal output terminal. This module includes a control transistor that is activated during the pull-down stage to block the coupling path, preventing the capacitor's voltage jump from coupling into the transmission signal and generating noise, while allowing the capacitor to function normally during the pull-up stage.
3Reliability
If the capacitor voltage jumps from high to low level during pull-down stage, then the reset function is achieved, but the coupling effect directly causes sharp spikes in the transmission signal
Solution Approach 1:
The patent applies preliminary anti-action by activating the denoising module's control transistor before or during the capacitor discharge process. This preemptive action blocks the coupling path in advance, preventing the capacitor's voltage jump from generating harmful spikes in the transmission signal, while maintaining the necessary reset function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The denoising module stabilizes the interstage shift transmission signals and reduces noise in the shift register circuit, resulting in improved display quality and stability of the output signals in flat panel displays.
Implementation Method 1
a first capacitor C1, a first terminal of which is connected with a pull-up node PU and a second terminal of which is connected with a pull-down node PD; the pull-up module 2 and the pull-down module 3 are both connected with an output terminal OUT2 of the shift register; the pull-up module 2 and the pull-down module 3 are further connected with a transmission signal output terminal OUT1 of the shift register
Implementation Method 2
the denoising module 4 is used for denoising the shift transmission signal output by the transmission signal output terminal OUT1 at the pull-down stage
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A shift register and a driving method therefor, a gate drive circuit and a display apparatus. The shift register comprises a triggered reset module, a pull-up module, a first capacitor and a pull-down module, and further comprises a denoising module. The pull-up module is used for pulling up a signal output from an output end of the shift register and a signal output from a delivery signal output end. The pull-down module is used for pulling down a signal output from the output end of the shift register and a signal output from the delivery signal output end. The denoising module is used for cutting off the connection passage between the delivery signal output end and a second end of the first capacitor in a pull-down phase. The shift register, by providing the denoising module, makes it possible to prevent a coupling effect of the capacitor from making a delivery signal output from the delivery signal output end generate a sparkle noise or the like, when a voltage jump occurs at a pull-up node thereof, so that a shift delivery signal of the shift register is more stable, thereby making the signal output from the shift register more stable.