Dual-Module Power Supply Circuit for High-Voltage VGH Driving
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Solution Overview
Problem
The voltage of the VGH signal in existing display technologies is low, failing to meet the high refresh rate requirement of display panels.
Innovation Solution
A power supply circuit comprising a first and second power supply module, where the first module outputs a VCI signal to trigger the second module, and both modules work together to generate a gate turn-on signal with a higher voltage by combining the second voltage signal ELVDD and the third voltage signal AVDD, thereby meeting the high refresh frequency requirement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the driving module generates VGH signal based on AVDD signal and VCI signal only, then the circuit structure is simple, but the voltage of VGH signal is low and cannot meet high refresh rate requirement
Solution Approach 1:
The power supply circuit is divided into two independent power supply modules: first power supply module outputs VCI signal, second power supply module outputs ELVDD signal. This segmentation allows each module to be optimized independently, with the second module providing higher voltage capability to boost VGH signal voltage for high refresh rate operation.
Solution Approach 2:
The patent combines outputs from both power supply modules by connecting the output end of the first power supply module to the first output end of the second power supply module, which is configured to be connected to the first input end of the driving module. This merging allows the driving module to receive both VCI and ELVDD signals simultaneously, enabling generation of high-voltage VGH signal that meets high refresh rate requirements.
2Power
If both power supply modules work together to output multiple voltage signals, then the voltage of gate turn-on signal increases to meet high refresh frequency requirement, but the layout area and cost increase
Solution Approach 1:
The second power supply module is designed with multiple output ends: first output end outputs ELVDD signal to first input end of driving module, second output end outputs AVDD signal to second input end of driving module. This multi-functionality allows a single power supply module to provide multiple voltage signals, reducing the need for separate dedicated circuits for each function and thereby controlling layout area.
Solution Approach 2:
The patent changes the voltage parameter by having the second power supply module output ELVDD signal with voltage higher than VCI signal from the first module. This parameter change enables the driving module to generate gate turn-on signal with sufficiently high voltage for high refresh frequency operation, while the modular design keeps the circuit area controlled.
Data Source
AI summary
A 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. The voltage signals are used to instruct the driving module to generate a gate turn-on signal.