Gate Driving Circuit Noise Suppression for Stable Scan Signals
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Solution Overview
Problem
Gate driving signals in electronic devices are susceptible to noise interference from temperature and pixel circuits, leading to abnormality and potential short circuits in other gate driving circuits.
Innovation Solution
A gate driving circuit design incorporating a pull-up circuit, pull-down circuit, output transistor, coupling capacitor, control transistor, and noise suppression circuit to stabilize the gate driving signals by suppressing noise and isolating interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gate driving circuits are used to scan pixel rows, then the display can be operated, but noise interference from temperature and pixel circuits causes signal abnormality and potential short circuits
Solution Approach 1:
A noise suppression circuit is introduced as an intermediary component between the gate driving circuit and the pixel circuit. This circuit includes a first terminal connected to the gate driving circuit, a second terminal connected to the pixel circuit, and a control terminal that receives a control signal. The noise suppression circuit actively suppresses noise at the operating node, isolating the harmful interference while allowing the gate driving signal to pass through, thus resolving the contradiction between maintaining display operation and preventing noise-induced abnormalities.
2Productivity
If the n-th gate driving signal generates noise, then the display can be driven, but other gate driving circuits operating based on the same signal become abnormal or short circuited
Solution Approach 1:
The noise suppression circuit extracts and removes the noise component from the gate driving signal before it affects other circuits. By actively suppressing noise at the operating node, the circuit separates the useful gate driving signal from the harmful noise, allowing multiple gate driving circuits to operate simultaneously without causing abnormalities or short circuits in others.
3Reliability
If noise suppression circuit is added to reduce noise interference, then the stability of gate driving circuit is improved, but the device complexity increases
Solution Approach 1:
The noise suppression circuit is designed with multi-functionality: it suppresses noise at the operating node, isolates interference from the pixel circuit, and protects other gate driving circuits simultaneously. By integrating these multiple functions into a single circuit structure controlled by a control signal, the design improves reliability without proportionally increasing device complexity.
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 design enhances the stability of gate driving circuits by reducing noise interference, minimizing the risk of abnormality and short circuits, thereby extending the life of the gate driving device.
Implementation Method 1
A coupling capacitor is connected between the second terminal of the output transistor and the control terminal of the output transistor
Implementation Method 2
The noise suppression circuit is connected to the operating node, the second terminal of the output transistor, and the second terminal of the control transistor. The noise suppression circuit suppresses noise at the operating node, noise at the second terminal of the output transistor, and noise at the second terminal of the control transistor
Data Source
AI summary
A gate driving circuit is provided. The gate driving circuit includes a pull-up circuit, a pull-down circuit, an output transistor, a control transistor, and a noise suppression circuit. The pull-up circuit pulls up a voltage value at an operating node according to an (n−1)th control signal. The pull-down circuit pulls down the voltage value at the operating node according to an (n+1)th control signal. The output transistor outputs a gate driving signal according to a first clock signal and the voltage value at the operating node. The control transistor outputs an n-th control signal according to the first clock signal and the voltage value at the operating node. The noise suppression circuit suppresses noise at the operating node, noise at a second terminal of the output transistor, and noise at a second terminal of the control transistor according to the (n+1)th control signal.