Gate Driving Circuit Leak Current Elimination
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Solution Overview
Problem
The existing gate driving circuits in liquid crystal display devices suffer from leak current issues due to voltage differences between power supplies, leading to potential burnout of power supply chips and instability in the gate driving units, particularly at high temperatures, which affects the display's reliability and service life.
Innovation Solution
The proposed gate driving circuit incorporates additional transistors and a configuration where the second power supply is lower than the first, creating discharge paths and eliminating leak current loops by ensuring that pull-down transistors are effectively turned off, and using low-frequency pulse signals to reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first power supply VSS1 and the second power supply VSS2 are used with negative voltages to pull down node voltages, then the gate driving unit can switch off the gate signal output end and the pull-up part, but a leak current path exists due to voltage difference between the power supplies, causing potential burnout and reduced reliability
Solution Approach 1:
The patent introduces a third power supply VSS3 with a voltage lower than both VSS1 and VSS2 as an intermediary. This third power supply serves as a mediator to eliminate the leak current path between VSS1 and VSS2 by providing a common reference potential, thereby resolving the harmful effect of leak current while maintaining the switching function of the gate driving unit
Solution Approach 2:
The patent changes the voltage parameter of the power supply system by adding VSS3 with a specifically designed lower voltage level. This parameter change creates a new voltage hierarchy where VSS3 < VSS2 < VSS1, which fundamentally alters the current flow characteristics and eliminates the leak current path that existed in the two-power-supply configuration
2Reliability
If additional transistors and power supply configuration are added to eliminate leak current, then reliability is improved, but device complexity increases
Solution Approach 1:
The third power supply VSS3 serves multiple functions simultaneously: it acts as a reference potential for eliminating leak current paths, provides a common ground for the pull-down transistors, and enables proper voltage level coordination between different parts of the circuit. This multi-functionality justifies the added component by providing several critical functions that improve reliability
Data Source
AI summary
The present invention relates to a gate driving circuit including a multiple of gate driving units. Each of the gate driving units comprises a pull-up control part, a pull-up part, a transfer part, a key pull-down part, a pull-down holding part and a boost part. In this case, the key pull-down part and the transfer part are configured, respectively, to pull potential on a gete signal output end down to and hold potentials on the control ends of the pull-up part and the transfer part at a potential of the first power supply or the second power supply, and also to pull potential on the output end of the transfer part ransfer signal down to and/or hold at a potential of the second power supply, wherein the potential of the second power supply is lower than that of the first power supply.