Shift Register Unit Reducing Transistor Duty Ratio
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Solution Overview
Problem
The existing Gate Driver on Array (GOA) circuit design for display devices has a high turn-on duty ratio for transistors, leading to reduced lifespan and increased power consumption due to long operational times, which complicates the bonding process and affects the display device's overall performance.
Innovation Solution
A shift register unit comprising an input module, pull-up module, pull-down control module, and pull-down module, with a driving method that reduces the turn-on duty ratio of transistors by controlling the pull-up and pull-down operations, thereby optimizing the operation of the gate driving circuit and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the existing GOA circuit design is used to reduce bonding region and peripheral wiring space, then the device complexity and manufacturing cost are reduced, but the turn-on duty ratio of transistors becomes large, reducing device lifespan and increasing power consumption
Solution Approach 1:
The shift register unit is divided into multiple functional modules: input module (transistors T1-T2), pull-up module (transistor T3), pull-down control module (transistors T4-T5), and pull-down module (transistors T6-T7). This segmentation allows independent control of different functions, enabling the transistors to operate in a more efficient manner with reduced duty ratios, thereby extending device lifespan while maintaining the compact GOA structure
Solution Approach 2:
The circuit employs periodic clock signal control (CLK) to regulate the operation of transistors. By using periodic switching instead of continuous operation, the transistors are activated only when needed for signal transmission, which significantly reduces their turn-on duty ratio and extends operational lifespan while maintaining reliable signal propagation through the shift register
2Area of stationary object
If the existing GOA circuit design is used to achieve narrow bezel and save wiring space, then the area of the display device is reduced, but the power consumption increases due to long operational time of each TFT
Solution Approach 1:
The circuit uses periodic clock signals to control transistor switching, ensuring that transistors are activated only during necessary signal transmission periods. This periodic operation mode reduces the duty ratio from continuous or frequent switching to controlled intermittent operation, significantly lowering power consumption while maintaining the compact wiring layout required for narrow bezel designs
Solution Approach 2:
The pull-down control module is extracted as a separate functional unit with dedicated control transistors (T4-T5) that can be independently activated. This allows the circuit to selectively enable only the necessary components during operation, reducing overall power consumption while maintaining the compact GOA structure that saves wiring space
3Reliability
If the turn-on duty ratio of transistors is reduced to extend device lifespan, then the reliability is improved, but the circuit design becomes more complex
Solution Approach 1:
The shift register unit is segmented into distinct functional modules with dedicated transistors for each function: input module (T1-T2), pull-up module (T3), pull-down control module (T4-T5), and pull-down module (T6-T7). This segmentation creates clear functional boundaries that simplify control logic and reduce the duty ratio of individual transistors, extending device lifespan without creating excessive complexity through systematic module organization
Solution Approach 2:
The control voltage terminal GC1 serves multiple functions: it controls the pull-down control module to reduce duty ratio of transistors T4 and T5, and also coordinates with the clock signal to regulate the operation of other transistors in the unit. This multi-functionality reduces the need for additional dedicated control circuits, maintaining design simplicity while achieving extended device lifespan through reduced transistor duty ratios
Data Source
AI summary
The present disclosure relates to a field of display technology. Provided are a shift register unit and a driving method thereof, a gate driving circuit and a display device. The shift register unit includes an input module, a pull-up module, a pull-down control module and a pull-down module. The turn-on duty ratio of transistors in the shift register unit may be reduced, and the power consumption of the display device product may be reduced.