Display Power Supply Circuit for High-Voltage VGH Gate Driving
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Solution Overview
Problem
The voltage of the VGH signal in existing display technologies is insufficient to meet the high refresh rate requirements of display panels, and there is a need to enhance the voltage without increasing the layout area of the power supply circuit.
Innovation Solution
A power supply circuit with a first and second power supply module, utilizing a unidirectional module and a discharging module to manage voltage signals, ensuring the generation of a higher VGH signal while maintaining a compact layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single power supply module is used to generate VGH signal, then the layout area is small, but the voltage of VGH signal is insufficient for high refresh rate requirements
Solution Approach 1:
The power supply circuit is divided into a first power supply module and a second power supply module. The first module generates a first voltage signal, while the second module generates a second voltage signal with higher voltage. This segmentation allows the system to achieve the required high VGH voltage for high refresh rates without requiring a single large-power module that would increase layout area.
Solution Approach 2:
The first power supply module and second power supply module are nested within the same driving apparatus, with the first module's output connected to the second module's input. This nested configuration allows compact integration of multiple voltage generation stages, achieving high VGH voltage through series connection while maintaining a compact overall layout.
2Productivity
If voltage is increased to meet high refresh rate requirements, then screen-off delay increases, but power consumption increases
Solution Approach 1:
A discharging module is introduced that actively discharges residual voltage from the second power supply module when switching from display mode to sleep mode. This preliminary discharge action ensures that voltage is rapidly reduced before the screen-off delay period begins, allowing the system to maintain high refresh rate performance during operation while minimizing screen-off delay and reducing unnecessary power consumption during idle periods.
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 effectively increases the voltage of the VGH signal to meet high refresh frequency requirements while controlling costs by maintaining a compact layout and reducing screen-off delay through efficient voltage discharge.
Implementation Method 1
The first unidirectional module comprises a diode or a unidirectional silicon controlled thyristor
Data Source
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AI summary
This application discloses a power supply circuit, a driving apparatus, and a display apparatus, and relates to the field of display technologies. The power supply circuit includes: a first power supply module and a second power supply module. An output end of the first power supply module is connected to a first output end of the second power supply module, and is configured to be connected to a first input end of the driving module. An output end of the first power supply module is configured to output a first voltage signal, and a first output end of the second power supply module is configured to output a second voltage signal. A second output end of the second power supply module is configured to be connected to a second input end of the driving module, so as to output a third voltage signal. Voltage signals that are output by the output end of the first power supply module, the first output end of the second power supply module, and the second output end of the second power supply module are used to instruct the driving module to generate a gate turn-on signal. The power supply circuit in this application can increase a voltage of the gate turn-on signal generated by the driving module, so that the voltage of the gate turn-on signal can meet a high refresh frequency requirement of a display panel.