Display Panel Drive Circuit With Dynamic Voltage Backup
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Solution Overview
Problem
Existing display driver circuits face challenges in efficiently managing power supply to display panels, leading to high power consumption and potential under-voltage issues, which affect the display quality, especially when handling varying load currents.
Innovation Solution
A drive device comprising a power management circuit and an internal driver circuit that coordinate power supply to a digital power supply terminal, with the power management circuit providing a continuous supply when the voltage is sufficient and the internal driver circuit assisting when the voltage drops below a reference level, using a low dropout regulator to convert and maintain the necessary voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the internal driver circuit continuously supplies power to the digital power supply terminal, then the display panel can maintain stable operation, but the power consumption increases
Solution Approach 1:
The internal driver circuit dynamically adjusts its power supply operation based on real-time voltage detection. When the digital power supply terminal voltage is sufficient, the internal driver circuit stops supplying power; when voltage drops below the reference level, it activates to supplement power. This dynamic on/off control based on voltage conditions resolves the contradiction between maintaining stable operation and reducing power consumption.
Solution Approach 2:
The internal driver circuit autonomously monitors the voltage at the digital power supply terminal and self-regulates its power supply operation without external control. It detects voltage levels and automatically activates or deactivates its power supply function, enabling the system to self-manage power distribution and reduce overall power consumption while maintaining stability.
2Device complexity
If the power management circuit supplies power alone, then the device complexity is reduced, but under-voltage issues occur affecting display quality
Solution Approach 1:
The power supply function is segmented between two independent circuits: the power management circuit and the internal driver circuit. Each circuit can operate independently or in coordination based on system needs. The power management circuit handles primary power supply while the internal driver circuit provides supplemental power when needed, dividing the power supply task to prevent under-voltage without requiring one complex unified circuit.
Solution Approach 2:
The system changes the operating parameters of the power supply system by introducing a reference voltage threshold that triggers the internal driver circuit's activation. When the digital power supply terminal voltage falls below this parameter threshold, the internal driver circuit activates to raise the voltage back to acceptable levels, ensuring display quality is maintained through parameter-based control.
3Reliability
If the internal driver circuit operates continuously to maintain voltage, then under-voltage is prevented, but the loss of energy increases
Solution Approach 1:
The internal driver circuit operates periodically rather than continuously, activating only when the voltage at the digital power supply terminal drops below the reference voltage threshold. This periodic activation based on voltage conditions prevents under-voltage issues while minimizing energy loss by keeping the circuit inactive during periods when voltage is already sufficient.
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
This coordinated power supply approach reduces power consumption and prevents under-voltage, ensuring stable display performance by sharing power supply pressure between the circuits, thereby improving driving flexibility and maintaining display quality.
Implementation Method 1
an internal driver circuit, configured to convert a second power supply voltage provided by a power supply terminal into a third power supply voltage and provide the third power supply voltage to the digital supply power terminal
Data Source
AI summary
A drive device for a display panel, a drive method thereof and a display apparatus. The drive device for the display panel includes: a power management circuit and an internal driver circuit; wherein the power management circuit is configured to provide a first power supply voltage to a digital power supply terminal, the internal driver circuit is configured to convert a second power supply voltage provided by a power supply terminal into a third power supply voltage and provide the third power supply voltage to the digital power supply terminal, and the digital power supply terminal is configured to provide a drive voltage to the display panel.