Cascaded Shift Register Layout for Stable Display Panel Gate Driving
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Solution Overview
Problem
The fluctuation of gate drive signals in cascaded shift registers of a display panel's driver circuit affects the accuracy of pixel signal refresh, impacting display quality due to fluctuations in output control signals.
Innovation Solution
A driver circuit with cascaded N-level shift registers, including a shift control module, shift output module, output control module, transmission control module, potential maintaining module, and drive output module, ensures independent control of signal levels and maintains fixed potential to stabilize gate drive signals, improving display accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cascaded N-level shift registers are used in the driver circuit, then the display panel can achieve multi-level signal control and flexible display functionality, but the gate drive signal fluctuates when nodes in the shift register change, affecting signal accuracy and display quality
Solution Approach 1:
The shift register is divided into multiple independent nodes (first node, second node, third node, fourth node) with dedicated control modules for each. The shift control module, shift output module, output control module, and transmission control module independently manage each node's signal state, preventing signal fluctuations when nodes change states during cascaded operation.
Solution Approach 2:
A potential maintaining module is introduced as an intermediary component that receives a fixed level signal and maintains the signal level of the third node. This intermediary mechanism stabilizes the gate drive signal by compensating for fluctuations caused by node changes in the cascaded shift register structure.
2Ease of operation
If the output control signal transmission path is dynamically controlled by the shift signal, then the display panel achieves flexible control over signal output, but the fluctuation of the output control signal affects the accuracy of the gate drive signal
Solution Approach 1:
The potential maintaining module serves as a mediator between the dynamically controlled output control signal and the gate drive signal. It receives the shift signal-controlled transmission path and maintains a stable fixed level signal to compensate for fluctuations, ensuring accurate gate drive signal output while preserving flexible control capability.
Solution Approach 2:
The system dynamically changes the transmission path parameter of the output control signal based on the shift signal, while the potential maintaining module keeps the signal level parameter stable. This parameter separation allows flexible control of signal transmission while maintaining signal accuracy for gate drive.
Data Source
AI summary
The present disclosure provides a display panel and a display apparatus. The display panel includes a driver circuit including shift registers. The shift register includes a shift control module, configured to receive an input signal, a first clock signal and a second clock signal, and control signals of a first node and a second node; a shift output module, configured to receive the signal of the first node, the signal of the second node, a first level signal and a second level signal, and control an output shift signal; an output control module, configured to receive an output control signal and the shift signal, and control a signal of a third node; a transmission control module, configured to receive the signal of the second node and a signal of the third node, and control a signal of the fourth node; a potential maintaining module; and a drive output module.