Gate Pulse Compensation Circuit for Stable GOA Display Startup
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Solution Overview
Problem
Conventional compensation circuits for gate-on-Array (GOA) circuits in display devices fail to maintain consistent waveforms of gate driving pulse signals due to environmental changes and electrical stress, leading to poor display quality or failure to start up.
Innovation Solution
A compensation circuitry comprising a pre-processing circuit, peak detector, discharge circuit, voltage buffer, and charge pump circuit, which adjusts and regulates the voltage difference between the highest and lowest levels of gate driving pulse signals, ensuring a consistent waveform by using a peak voltage to modulate the waveform of the gate driving pulse signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional compensation circuits are used for temperature compensation only, then temperature stability is improved, but the circuit cannot compensate for other factors such as electrical stress and load changes
Solution Approach 1:
The patent extends the compensation circuit to perform multiple compensation functions simultaneously. The circuit now compensates for temperature changes, electrical stress, and load variations by using the peak voltage detection and charge pump mechanisms to adjust the gate driving pulse signal in response to any voltage deviation, making the compensation system universal rather than temperature-specific
Solution Approach 2:
The patent implements a feedback mechanism where the peak voltage of the gate driving pulse signal is continuously detected and fed back to the charge pump circuit. This feedback loop enables the circuit to automatically adjust and compensate for voltage deviations caused by any factor including temperature, electrical stress, or load changes, achieving comprehensive compensation
2Reliability
If the gate driving pulse signal voltage difference is not stabilized, then the circuit is simpler, but display quality deteriorates and startup reliability is reduced
Solution Approach 1:
The compensation circuit is designed to automatically detect and correct voltage deviations without external intervention. The peak voltage detection circuit continuously monitors the gate driving pulse signal and the charge pump circuit automatically adjusts the voltage level based on detected deviations, enabling the system to self-correct and maintain stable operation
Solution Approach 2:
The patent changes the voltage parameter of the gate driving pulse signal dynamically to maintain optimal operation. By adjusting the voltage level of the gate driving pulse signal in real-time based on detected peak voltages and environmental conditions, the circuit ensures consistent display quality and reliable startup across varying operating conditions
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 ensures continuous and real-time compensation for factors affecting the gate driving circuit, maintaining a stable voltage difference between the highest and lowest voltages of the gate driving pulse signals, thereby improving display quality and reliability.
Implementation Method 1
The peak detector receives the pre-processed gate driving pulse signal and performs a charging operation to obtain a peak voltage of the pre-processed gated driving pulse signal
Implementation Method 2
The discharge circuit receives the pre-processed gate driving pulse signal and provides the peak detector with a discharge loop for discharge
Implementation Method 3
The charge pump circuit acquires the peak voltage from an output terminal of the voltage buffer and modulates a waveform of the gate driving pulse signal according to the peak voltage
Data Source
AI summary
A compensation circuitry of gate driving pulse signal is adapted to receive a gate driving pulse signal and includes a pre-processing circuit, a peak detector, a discharge circuit, a voltage buffer and a charge pump circuit. The pre-preprocessing circuit performs a pre-processing operation to the gate driving pulse signal to adjust a voltage thereof. The pre-processed gate driving pulse signal then is transmitted to the peak detector for obtaining a peak voltage after a charging operation, and also is transmitted to the discharge circuit to determine whether to enable the discharge circuit so that providing the peak detector with a discharge loop when the discharge circuit is enabled. The charge pump circuit acquires the peak voltage through the voltage buffer and then modulates a waveform of the gate driving pulse signal according to the peak voltage. A display device using the above compensation circuitry also is provided.