Display Panel Gate Driving Circuit for Stable High-Voltage Output
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Solution Overview
Problem
The stability of the gate driving signal in display panels is compromised due to voltage level transitions affecting internal nodes, leading to instability in the gate driving circuit.
Innovation Solution
A gate driving circuit with a cascade signal selection module, pull-up control module, filter modules, and output modules, including P-type and N-type transistors, to stabilize the gate driving signal by regulating voltage levels and reducing leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage level transitions are implemented in the gate driving circuit, then the gate driving signal can be generated and transmitted, but the stability of the voltage level of internal nodes deteriorates, leading to reduced stability of the gate driving signal
Solution Approach 1:
The patent introduces a compensation capacitor connected between the internal node and a reference voltage line. This capacitor acts as an intermediary element that compensates for voltage fluctuations at the internal node during signal transitions. By storing and releasing charge, the capacitor stabilizes the internal node voltage level, thereby maintaining the stability of the gate driving signal despite voltage level transitions in the circuit.
Solution Approach 2:
The patent employs a compensation capacitor that is pre-charged to a specific voltage level before signal transitions occur. This beforehand cushioning of voltage through the capacitor prepares the internal node to withstand upcoming voltage transitions, reducing the impact of these transitions on the stability of the gate driving signal. The capacitor acts as a buffer that absorbs voltage variations before they can affect the signal stability.
2Reliability
If the gate driving circuit operates with voltage level transitions, then signal transmission is enabled, but leakage current increases, reducing the high voltage level stability
Solution Approach 1:
The compensation capacitor serves as an intermediary that isolates the high voltage level from leakage current paths. By connecting the capacitor between the internal node and the reference voltage line, it provides a controlled path for charge storage and release, preventing leakage current from directly affecting the high voltage level. This intermediary structure maintains voltage level stability by compensating for charge losses due to leakage.
Solution Approach 2:
The patent utilizes the voltage-dependent characteristics of the compensation capacitor to dynamically adjust the circuit's electrical parameters. As the capacitor charges and discharges, it changes the effective impedance and voltage levels at critical nodes, thereby adapting the circuit's behavior to minimize leakage current effects and maintain high voltage level stability during operation.
Data Source
AI summary
The present disclosure provides a gate driving circuit and a display panel. by the control of one of the fourth node, the output end of the second output module, and the first node of the shift register of the next stage, the voltage regulating module may utilize a low voltage signal to stabilize or reduce the gate voltage of the second transistor, so that the second transistor is stable or preferably in the cut-off state to reduce the leakage current. In this way, voltage level of the second gate driving signal can be maintained at a high voltage level or a pulse amplitude.