Gate Driving Circuit Leakage Prevention via Bias Shielding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Gate driving circuits in display devices experience unwanted leakage current, leading to malfunctions, which existing technologies have not effectively addressed.
Innovation Solution
A gate driving circuit with a differential structure that includes odd-numbered and even-numbered stage circuits, utilizing bias transistors to supply a bias voltage to shield metals, preventing leakage current and gate output deviations by using distinct low-level voltages and clock signals in each stage circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional gate driving circuit is used, then the circuit can operate, but leakage current occurs causing malfunction
Solution Approach 1:
The gate driving circuit is divided into multiple stage circuits (first stage, second stage, etc.) where each stage is independently configured with specific transistors and capacitors. This segmentation allows each stage to be optimized separately to prevent leakage current while maintaining overall circuit functionality.
Solution Approach 2:
Different stage circuits are configured with different transistor types and capacitor connections based on their specific positions in the circuit. For example, odd-numbered stages use one configuration while even-numbered stages use another, allowing each local region to have optimal properties for preventing leakage current.
2Reliability
If a differential structure with different stage circuits is used, then leakage current is prevented, but device complexity increases
Solution Approach 1:
The differential structure uses asymmetric configurations where odd-numbered stage circuits and even-numbered stage circuits have different transistor types and capacitor connections. This asymmetry is deliberately designed to prevent leakage current by creating complementary driving signals that cancel out unwanted effects.
Solution Approach 2:
Despite the different configurations, both odd and even stage circuits perform the same fundamental function of generating gate signals. The universal functionality is maintained through consistent use of clock signals, low-level voltages, and output stages, while only the internal transistor arrangements differ.
Data Source
AI summary
A gate driving circuit includes a first type of stage circuit for outputting a first gate signal and a second type of stage circuit for outputting a second gate signal, and further including a bias transistor for supplying, when turned-on, a bias voltage to a shield metal positioned to overlap with a semiconductor layer of a specific transistor among a plurality of transistors included in the first type of stage circuit, thereby preventing a leakage current from occurring inside the gate driving circuit.