Boosted Gate Driving Circuit for Stable Display Signal Output
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Solution Overview
Problem
Gate driving circuits in display apparatuses can become defective due to transistor deterioration, leading to instability in gate signal output.
Innovation Solution
A gate driving circuit design incorporating multiple stages with control circuits, output circuits, and boosting circuits to stabilize gate signal output, utilizing transistors connected in series and parallel configurations to manage voltage levels and timing, and including capacitors for voltage boosting and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transistors are used in the gate driving circuit, then the circuit can operate and output gate signals, but the transistors deteriorate over time causing circuit defects and signal instability
Solution Approach 1:
The patent changes the voltage level parameter by introducing a boosted voltage (ELVDD + ΔV) through a voltage boosting circuit. This parameter change allows the circuit to operate with higher voltage margins, compensating for transistor deterioration over time and maintaining stable gate signal output throughout the transistor's lifespan.
Solution Approach 2:
The patent implements prior cushioning by pre-charging a capacitor (Cst) connected to the gate of the first transistor before the transistor needs to switch. This pre-charged capacitor provides a voltage buffer that compensates for voltage drops caused by transistor deterioration, ensuring stable operation even as transistors age.
2Reliability
If voltage boosting circuits are added to stabilize gate signal output, then signal stability improves, but circuit complexity increases
Solution Approach 1:
The voltage boosting circuit is designed to serve multiple functions: it boosts the voltage for the first transistor, charges the capacitor Cst, and provides compensation for transistor deterioration. This multi-functionality reduces the need for separate circuits for each function, thereby limiting the increase in overall circuit complexity while achieving signal stability.
Data Source
AI summary
A stage of a gate driving circuit includes a first control circuit connected to a first voltage input terminal receiving a first voltage and a second voltage input terminal receiving a second voltage lower than the first voltage, the first control circuit being configured to control voltage levels of a first control node and a second control node; a first output circuit connected to a first clock terminal and a third voltage input terminal receiving a third voltage, the first output circuit being configured to output a gate signal according to the voltage levels of the first control node and the second control node; and a second output circuit connected to a second clock terminal and the second voltage input terminal, the second output circuit being configured to output a carry signal according to the voltage levels of the first control node and the second control node.