Shift Register Circuit with Boot Capacitor for Low Power Gate Driving
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current gate driver circuits face issues with high dynamic power consumption and clock feedthrough due to direct connection of driving transistors with clock signals, leading to performance degradation and increased complexity.
Innovation Solution
A switch capacitor voltage self-lift circuit is introduced, which includes a shift register unit with an input storing module, storage retrieving module, and a pulling-down and maintaining module, where the output transistor is connected to a high voltage supply, and the storing and retrieving modules are controlled by clock signals, avoiding direct connection to clock signals and using a single low power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If driving transistors are directly connected to clock signals, then driving capability is improved, but dynamic power consumption and clock feedthrough increase
Solution Approach 1:
The patent introduces a boot capacitor as an intermediary element between the driving transistor and the clock signal. The boot capacitor stores voltage and provides it to the driving transistor through a boot transistor, rather than directly connecting the driving transistor to the clock signal. This intermediary approach maintains the driving capability while reducing dynamic power consumption and clock feedthrough effects.
2Power
If driving transistors are directly connected to clock signals, then driving capability is improved, but circuit complexity increases
Solution Approach 1:
The patent designs the boot capacitor and boot transistor to serve multiple functions: they provide voltage boosting for the driving transistor, acts as a storage element, and eliminate the need for direct clock signal connection. This multi-functional design achieves driving capability enhancement without proportionally increasing circuit complexity.
3Device complexity
If a single low power supply is used, then circuit complexity is reduced, but voltage stability may deteriorate
Solution Approach 1:
The patent uses the boot capacitor to pre-store voltage before it is needed by the driving transistor. This preliminary charging action ensures that when the driving transistor needs to operate, stable voltage is already available from the capacitor, maintaining voltage stability even with a single low power supply configuration.
Data Source
AI summary
The present disclosure includes a shift register unit circuit, including input storing module, configured to receive an input signal at an input terminal and store the input signal; storage retrieving module, configured to retrieve the input signal from the input storing module under influence of at least a first clock signal; output driving module, configured to transfer the input signal to an first output terminal under control of the storage retrieving module; and pulling-down and maintaining module, configured to pull down a voltage at the output terminal to low voltage level after output operation is completed, and maintain the voltage at low voltage level until the output driving module receives a next input signal. The present disclosure also includes a gate driver circuit including such shift register units and a method for generating gate driving signal.