Gate Driving Circuit with Stepwise Pull-Up Node Leakage Control
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Solution Overview
Problem
The potential of the pull-up node in gate driving circuits is increased at a faster speed due to constant output potential, leading to leakage issues.
Innovation Solution
A gate driving circuit with a pull-up control module that stepwise increases the potential of the pull-up node, accompanied by an inversion module to output an anti-leakage control signal and a feedback module to reduce leakage to a low potential line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the output potential of the pull-up control module is kept constant, then the structure is simple, but the potential of the pull-up node increases too quickly causing leakage
Solution Approach 1:
The pull-up control module transitions from a constant output potential to a dynamic output potential that changes over time. The module generates a first output potential during a first time period and switches to a second output potential during a second time period, allowing the pull-up node potential to increase rapidly initially and then stabilize, preventing leakage while maintaining operational effectiveness.
Solution Approach 2:
The pull-up control module employs periodic action by dividing the operation into distinct time periods with different output potentials. The first output potential is applied during the first time period to quickly raise the pull-up node potential, and the second output potential is applied during the second time period to maintain the potential at an appropriate level, preventing excessive increase and leakage.
2Speed
If the potential of the pull-up node is increased quickly, then the response speed is fast, but leakage occurs
Solution Approach 1:
The solution divides the potential increase process into periodic stages: a first time period where the first output potential quickly raises the pull-up node potential (fast response), and a second time period where the second output potential maintains the potential at a controlled level (preventing leakage). This periodic control achieves both fast response and leakage prevention.
Solution Approach 2:
The output potential of the pull-up control module is made dynamic rather than static, allowing it to adapt to different operational phases. The module provides high potential initially for fast response, then transitions to a maintained potential level to prevent leakage, achieving both speed and reliability requirements.
3Reliability
If a feedback module is added to reduce leakage, then leakage control improves, but device complexity increases
Solution Approach 1:
The feedback function is merged into the pull-up control module itself rather than being implemented as a separate external circuit. The module internally generates different output potentials at different time periods based on the pull-up node state, achieving leakage control through integrated temporal control rather than additional feedback components.
Solution Approach 2:
Instead of adding complex continuous feedback circuitry, the solution uses periodic action with discrete time periods. The pull-up control module automatically switches between first and second output potentials at appropriate times, achieving leakage control through time-based control rather than complex continuous feedback mechanisms.
Data Source
AI summary
The present application provides a gate driving circuit and a display panel. The gate driving circuit includes a plurality of cascaded gate driving units, where each of the plurality of cascaded gate driving units includes a pull-up control module, an inversion module and a feedback module. The potential of the pull-up node is stepwise increased by the pull-up control module, so that the feedback module can be controlled to be turned off by the inversion module when the potential of the pull-up node is lower, thereby improving a phenomenon of leakage of the pull-up node through the feedback module.