GOA Input Module CMOS Transmission Gate for Scan Signal Drive
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display (LCD) technologies face challenges in ensuring strong enough drive current for the trigger node in gate driver on array (GOA) substrates, affecting the quality of scan signals.
Innovation Solution
The proposed GOA substrate incorporates a cascade-connected circuit structure with a CMOS transmission gate and transistors, including P-channel and N-channel MOSFETs, to enhance the drive current and stability of the circuit, utilizing a reset module, latch module, and output module to manage and amplify the scan signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional transistor configuration is used in GOA circuit units, then device complexity is reduced, but drive current of trigger node is insufficient affecting scan signal quality
Solution Approach 1:
The patent combines a CMOS transmission gate (comprising second and third transistors) with a first transistor in the input module to create a composite switching structure. This merged configuration provides stronger drive current capability while maintaining integrated circuit compatibility, directly resolving the contradiction between drive current strength and device complexity.
Solution Approach 2:
The input module with the enhanced transistor configuration serves multiple functions: it provides strong drive current to the trigger node, enables fast signal transmission, and maintains compatibility with standard CMOS fabrication processes. This multi-functionality allows the circuit to achieve high performance without proportionally increasing complexity.
2Reliability
If drive current of trigger node is increased to improve scan signal quality, then scan signal quality improves, but power loss increases
Solution Approach 1:
The patent employs dynamic control of the transistor switching states through clock signals (first clock signal and second clock signal that are inverted to each other). This dynamic operation allows the circuit to achieve high drive current only when needed for signal transmission, reducing power loss during idle states while maintaining scan signal quality.
Solution Approach 2:
The use of periodic clock signals to control the switching of transistors in the input module enables the circuit to deliver high drive current in periodic pulses synchronized with the scan operation. This periodic action ensures strong signal quality during active periods while minimizing power consumption during non-active periods.
3Speed
If conventional transistor configuration is used, then manufacturing is simpler, but level transmission speed is reduced
Solution Approach 1:
The patent merges a CMOS transmission gate with an additional transistor in the input module to create a high-speed switching structure. This combined configuration provides lower on-resistance and faster charging/discharging capability, significantly improving level transmission speed while remaining compatible with standard manufacturing processes.
Data Source
AI summary
A GOA substrate includes GOA circuit units connected in cascade. The GOA circuit unit includes an output module, a reset module, a latch module, and an input module. The output module is used for outputting the scan signal based on a trigger signal. The reset module is used for resetting the trigger signal based on the reset signal. The latch module is used to hold and pull down the electric potential of the trigger signal. The input module is used for receiving the scan signal outputted by the previous stage GOA circuit unit. The input module includes a first CMOS transmission gate and a first transistor. The input module can lower the equivalent on-resistance of the transistor, elevate the drive current between the input terminal and the output terminal, so to increase level transmission speed, lower drive power loss of the transistor and improve the stability of the circuit.