Gate Driving Circuit Noise Reduction via Pull-Up Node Control
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Solution Overview
Problem
In gate driving circuit units, the competing connection relationship between pull-up and pull-down nodes leads to insufficient charging of the pull-up node due to noise interference, preventing the output of gate driving signals when the pull-down node potential is high.
Innovation Solution
A gate driving circuit unit is designed with a pull-up node noise-reduction circuit and a pull-up control circuit that controls the electrical connection between the pull-up node and the input end, ensuring the pull-up node is charged effectively by preventing potential interference from the pull-down node, even at high pull-down node voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the pull-up node is charged by an input signal from the input end, then the gate driving signal can be outputted, but the potential at the pull-up node is pulled down by the pull-down node through a noise-reduction TFT simultaneously, causing insufficient charging
Solution Approach 1:
The patent applies preliminary action by controlling the noise-reduction TFT to be turned off during the charging phase. Specifically, the control signal generation circuit generates a control signal that turns off the noise-reduction TFT before the pull-up node charging occurs, preventing the potential pulling down effect in advance. This ensures the pull-up node can be fully charged without interference, and the noise-reduction TFT is turned on only after charging is complete to eliminate noise.
2Object-affected harmful factors
If the noise-reduction TFT is turned on to reduce noise, then noise interference is reduced, but the pull-up node cannot be charged when the potential at the pull-down node is relatively high
Solution Approach 1:
The patent implements periodic action by sequentially switching the noise-reduction TFT between on and off states based on different operational phases. The control signal generation circuit produces periodic control signals that turn off the noise-reduction TFT during the charging phase and turn it on during the noise-reduction phase. This time-division multiplexing approach ensures both charging reliability and noise reduction are achieved at different time periods.
3Stability of the object's composition
If the pull-down node potential is kept high to maintain circuit state, then the circuit state is maintained, but it becomes impossible to charge the pull-up node
Solution Approach 1:
The patent applies dynamics by making the noise-reduction TFT's on/off state dynamic rather than static. The TFT's state is continuously adjusted based on the operational phase: it is turned off when charging is needed and turned on when noise reduction is needed. This dynamic control, implemented through the control signal generation circuit, allows the circuit to switch between different operational modes, resolving the conflict between maintaining high pull-down node potential for stability and enabling pull-up node charging.
Data Source
AI summary
A gate driving circuit unit, a gate driving circuit and a display device are provided. The gate driving circuit unit includes a pull-up node noise-reduction circuit and a pull-up control circuit. The pull-up node noise-reduction circuit is electrically connected to an input end, a pull-down node and a pull-up node, and configured to control the pull-up node to be electrically connected to, or electrically disconnected from, the input end under the control of a potential at the pull-down node. The pull-up control circuit is electrically connected to the pull-up node and the input end, and configured to control the pull-up node to be electrically connected to the input end at an input stage.