Gate Driver Circuit With Stabilization Transistor for Leakage Control
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Solution Overview
Problem
The output stability of gate signals in display apparatuses is deteriorated due to leakage currents in gate drivers.
Innovation Solution
A gate driver design incorporating a pull-up circuit, pull-down circuit, gate signal control circuit, and a stabilization transistor, where the stabilization transistor is turned off during specific periods to reduce leakage current, thereby stabilizing the output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gate driver is used to drive gate lines in a display panel, then the display operation is enabled, but leakage current flows in the gate driver which deteriorates the output stability of gate signals
Solution Approach 1:
The patent extracts and addresses the leakage current issue by introducing a specific circuit configuration with transistors (T1-T6) and capacitors (C1, C2) that isolates and manages the leakage current paths. The stabilization transistor TST is specifically designed to counteract the harmful leakage current effects on the output node, thereby improving gate signal stability without affecting the overall display operation.
Solution Approach 2:
The patent employs parameter changes by dynamically controlling the on/off states of transistors T1-T6 and TST based on different operating phases (input phase, output phase, reset phase). By changing the conduction states of these transistors at different times, the circuit optimizes the voltage levels at intermediate nodes (N1-N5) and minimizes leakage current effects during critical signal output periods, thereby stabilizing the gate signal output.
2Reliability
If a stabilization transistor is added to reduce leakage current, then the output stability is improved, but the device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by designing a circuit where transistors T1-T6 serve multiple purposes: T1 and T2 control the input signal phase, T3 and T4 manage the output signal phase, T5 and T6 handle reset operations, and TST specifically stabilizes the output against leakage. This universal design allows a single circuit block to perform signal input, signal output, reset, and stabilization functions simultaneously, reducing the need for separate dedicated circuits for each function.
Solution Approach 2:
The patent merges the stabilization function directly into the gate driver circuit by integrating transistor TST within the existing multi-transistor configuration. Rather than adding a completely separate stabilization circuit, the patent combines the leakage compensation function with the signal processing transistors, sharing common nodes and control signals. This merging approach reduces overall circuit complexity while achieving both signal driving and stabilization objectives.
Data Source
AI summary
A gate driver includes a plurality of stages. A stage of the stages includes a pull-up circuit which applies a high voltage to an output node which outputs a gate signal, a pull-down circuit which applies a low voltage lower than the high voltage to the output node, a gate signal control circuit which controls the pull-up circuit and the pull-down circuit, and a stabilization transistor connected to the pull-down circuit. The stabilization transistor is turned off when the gate signal has the low voltage.