Gate Driving Circuit Bootstrap for Stable Display Gate Signals
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Solution Overview
Problem
The stability and reliability of gate driving circuits in display devices are compromised due to unstable output signals caused by voltage changes in capacitors, leading to insufficient threshold voltage compensation and reduced luminance in pixels.
Innovation Solution
The gate driving circuit incorporates a first and second control circuit to manage voltages at control nodes, utilizing transistors and capacitors to stabilize node voltages, and includes a reset circuit for initialization, enhancing stability and reliability through capacitive storage of voltage differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a capacitor is used to store clock signal voltage in the gate driving circuit stage, then the circuit can operate with standard components, but the output signal becomes unstable when the capacitor voltage changes
Solution Approach 1:
The patent introduces a bootstrap circuit as an intermediary mechanism between the capacitor and the output stage. This bootstrap circuit actively compensates for capacitor voltage changes by adjusting the drive signal, thereby maintaining stable output signals despite capacitor voltage fluctuations. The bootstrap circuit acts as a mediator that isolates the output stability from capacitor voltage variations.
2Stability of the object's composition
If the capacitor voltage changes due to coupling, then the clock signal voltage changes, but this causes the output signal to become unstable and reduces circuit reliability
Solution Approach 1:
The bootstrap circuit implements a feedback mechanism that continuously monitors the capacitor voltage and adjusts the output drive signal accordingly. When capacitor voltage changes are detected, the feedback loop automatically compensates by modifying the gate drive signal to maintain stable output. This closed-loop feedback ensures that output stability is maintained despite internal voltage fluctuations.
3Device complexity
If the gate driving circuit uses conventional capacitor coupling, then the circuit design is simple, but the pixel cannot sufficiently operate threshold voltage compensation
Solution Approach 1:
The bootstrap circuit performs preliminary action by pre-charging the capacitor and establishing stable voltage conditions before the pixel operates. This pre-conditioning ensures that when the pixel performs threshold voltage compensation, the capacitor provides stable coupling without voltage fluctuations that would interfere with the precision of the compensation operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves the stability and reliability of gate signal output, ensuring consistent pixel operation and luminance by maintaining stable voltage levels across control nodes.
Implementation Method 1
a second capacitor including a first electrode connected to the first node and a second electrode connected to the second node
Data Source
AI summary
A gate driving circuit includes a first control circuit for controlling a voltage of a first control node, a second control circuit for controlling a voltage of a second control node, and an output circuit for outputting a first clock signal or a first voltage as a gate signal based on the voltage of the first control node and the voltage of the second control node. The second control circuit includes a switching circuit connected to a first node and a second node, and for receiving the second clock signal, a second capacitor including a first electrode connected to the first node and a second electrode connected to the second node, and a fourth capacitor including a first electrode for receiving a second voltage and a second electrode connected to the second node.