Gate Driving Circuit Shift Register Voltage Boosting
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Solution Overview
Problem
Conventional gate driving circuits in displays face challenges in supporting high frame rates and low temperature environments due to excessive voltage stress on driving transistors, leading to breakdown and instability.
Innovation Solution
The proposed gate driving circuit incorporates a shift register with a voltage boosting unit that steps up the gate driving signal from a reference potential to a preset potential and then to a gate high potential, reducing the cross voltage on driving transistors and preventing breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional shift register outputs a gate driving signal with high voltage difference to support high frame rate and low temperature operation, then the display performance is improved, but the driving transistor breaks down due to excessively high cross voltage
Solution Approach 1:
The gate driving signal output is segmented into two separate output ends: a first output end for generating the gate driving signal and a second output end for generating the scanning signal. This segmentation allows independent optimization of each output path, enabling the first output end to provide high voltage difference signals for high frame rate operation while the circuit architecture protects the driving transistor from excessive cross voltage through the dual-output configuration
Solution Approach 2:
A voltage coupling unit is introduced as an intermediary component electrically coupled between the node and the second output end. This voltage coupling unit mediates the voltage levels between stages, enabling proper voltage timing and level shifting so that the gate driving signal can achieve high voltage difference for high frame rate operation while the driving transistor operates within safe voltage limits
2Stability of the object's composition
If a conventional shift register increases the gate driving signal voltage difference to provide temperature compensation in low temperature environment, then the display stability is improved, but the driving transistor current becomes excessively large causing breakdown
Solution Approach 1:
The output functionality is segmented into two separate output ends, allowing the gate driving signal to be optimized for temperature compensation with high voltage difference while the scanning signal handles timing functions. This separation enables the driving transistor to operate with moderate current levels while still achieving the necessary voltage swing for low temperature compensation
Solution Approach 2:
The circuit architecture changes the voltage parameters through the voltage coupling unit and dual-output configuration, enabling the gate driving signal to achieve the high voltage difference needed for temperature compensation without proportionally increasing the current through the driving transistor, thus avoiding breakdown while maintaining stability in low temperature environments
Data Source
AI summary
The present embodiment of the invention provides a gate driving circuit and a display apparatus using the gate driving circuit. The gate driving circuit has a plurality of shift registers, and each shift register includes a first output unit, a first pull-down unit, a second output unit, a second pull-down unit, a voltage coupling unit, and a voltage boosting unit. The first output unit is coupled to a node and a first output end. The second output unit is coupled to the node and a second output end. The first pull-down unit is coupled to the first output end and a reference potential. The second pull-down unit is coupled to the second output end and the reference potential. The voltage coupling unit is coupled between the node and the second output end. The voltage boosting unit is coupled to a preset potential, the first output end, and a node and a gate high potential of a shift register at a previous stage.