Gate Driving Circuit Isolation Module for Display Device Signal Stability
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Solution Overview
Problem
Existing gate driving circuits in display technologies suffer from failures due to fluctuations in the electric potential of the first node, caused by clock signal fluctuations and parasitic capacitive coupling, leading to incorrect output signals and reduced pull-down maintenance effects over time.
Innovation Solution
The proposed gate driving circuit incorporates a pull-up module, an isolation module, a pull-down maintaining module, and an inverting module. The isolation module blocks the coupling effect of the electric potential variation of the first node on the second node, while the inverting module controls the pull-down maintaining module to stabilize the electric potential of the first node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single set of inverter is adopted to achieve pull-down maintenance of the first node, then the device complexity is reduced, but the pull-down effect decreases after long-term use and the circuit reliability deteriorates
Solution Approach 1:
The patent divides the pull-down maintenance function into two separate modules: a first pull-down maintaining module connected to the first node and a second pull-down maintaining module connected to the second node. This segmentation allows each module to independently maintain the pull-down effect, preventing the degradation that occurs with a single inverter over time.
Solution Approach 2:
The isolation module acts as an intermediary between the first node and the second node, blocking the coupling effect while allowing the pull-down maintaining modules to function independently. This mediator enables the second pull-down maintaining module to compensate for any degradation in the first module without affecting the overall circuit reliability.
2Device complexity
If the clock signal is transmitted through the first node, then the signal transmission is simplified, but the parasitic capacitive coupling causes electric potential fluctuations that affect transistor operation
Solution Approach 1:
The isolation module serves as a mediator that blocks the parasitic capacitive coupling between the first node and the second node. This allows the clock signal to be transmitted through the first node without causing harmful electric potential fluctuations in the second node, effectively eliminating the coupling effect while maintaining signal transmission simplicity.
Solution Approach 2:
The patent segments the signal transmission path by introducing separate pull-down maintaining modules for the first and second nodes. This segmentation isolates the clock signal transmission path from the pull-down maintenance path, preventing parasitic capacitive coupling from affecting the transistor operation while maintaining both functions.
3Productivity
If the electric potential of the first node fluctuates due to clock signal changes, then the signal response is dynamic, but the fluctuation spreads to the second node causing incorrect output signals
Solution Approach 1:
The isolation module acts as a mediator that blocks the propagation of electric potential fluctuations from the first node to the second node. This allows the circuit to maintain dynamic signal response at the first node while preventing these fluctuations from spreading to the second node, ensuring correct output signals.
Solution Approach 2:
The patent segments the circuit into independent functional blocks with separate pull-down maintaining modules for each node. This segmentation ensures that dynamic fluctuations at the first node are isolated from the second node, maintaining signal response dynamics while ensuring output signal correctness.
Data Source
AI summary
The present application provides a gate driving circuit and a display device including a pull-up module, an isolation module, a pull-down maintaining module, and an inverting module. A coupling effect of an electric potential variation of a first node on an electric potential of a second node is blocked by providing the isolation module. Therefore, in a case that a clock signal fluctuates so that the electric potential of the first node fluctuates, that a change of the electric potential of the first node spreads to the electric potential of the second node is blocked, and the electric potential of the second node is stabilized. A failure of the gate driving circuit is improved.