Power Supply Segmentation for LCD Voltage Drop
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Solution Overview
Problem
As LCDs increase in size and resolution, the length of power lines needed to supply power to driving units increases, leading to significant voltage drops due to impedance, which limits the driving capability and response speed of units at the far ends.
Innovation Solution
A power supply system with a switch unit and voltage detector is implemented near nodes in the power line, allowing auxiliary power to be supplied when the terminal voltage falls below a threshold, enhancing the driving capability and response speed of driving units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the number of driving units increases and/or the layout length increases to support larger LCD screens, then the screen size and resolution are improved, but the power line length increases causing significant voltage drop that limits driving capability and response speed
Solution Approach 1:
The power supply system is segmented into multiple independent power supply units distributed along the power line. Each power supply unit serves a specific segment or region of the circuit device, rather than relying on a single centralized power supply. This segmentation reduces the distance power needs to travel through the power line, minimizing voltage drop and improving driving capability at remote locations.
Solution Approach 2:
Auxiliary power supply units act as intermediaries between the main power supply and remote driving units. These intermediary power supplies boost or maintain voltage levels at critical points along the power line, compensating for voltage drops caused by impedance in long power lines and ensuring adequate power delivery to distant components.
2Ease of operation
If the power line length increases to reach far-end driving units, then all driving units can be powered, but the impedance on the power line generates significant voltage drop influencing driving capability and response speed
Solution Approach 1:
The system performs preliminary voltage compensation by introducing auxiliary power supply units at strategic locations before voltage drop becomes problematic. These units proactively maintain voltage levels along the power line, ensuring that remote driving units receive adequate power before they need to operate, thus maintaining fast response speeds.
Solution Approach 2:
Different segments of the power line receive different power supply configurations tailored to their specific needs. Regions with higher power demand or longer distances from the main power supply are equipped with auxiliary power units, while regions closer to the main supply use standard power delivery. This localized approach optimizes response speed where needed without unnecessarily complicating the overall system.
3Reliability
If the voltage operating range of far-end driving units is limited due to voltage drop, then power line impedance effects are reduced, but longer charging time is required to charge these driving units
Solution Approach 1:
The auxiliary power supply units ensure continuous and uninterrupted power delivery to remote driving units by compensating for voltage drop in real-time. This continuous power supply eliminates charging delays that would otherwise occur when voltage sags, maintaining steady charging current and reducing overall charging time while preserving voltage stability.
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 system improves the driving capability and response speed of driving units by maintaining stable voltage levels and reducing charging time, especially for units at the far ends of the power line.
Implementation Method 1
The voltage detector, coupled to the circuit device and the switch unit, is used for detecting a voltage of the node
Implementation Method 2
The power supply unit, coupled to the circuit device via a power line, is used for supplying basic power for the circuit device via the power line
Implementation Method 3
The impedance on the power line generates a significant voltage drop
Data Source
AI summary
A power supply system for a circuit device includes a power supply unit, a switch unit and a voltage detector. The power supply unit, coupled to the circuit device via a power line, is used for supplying basic power for the circuit device via the power line, wherein the power line is coupled to the circuit device via a plurality of nodes. The switch unit, near to a node among the plurality of nodes, is coupled to the circuit device via the power line. The voltage detector, coupled to the circuit device and the switch unit, is used for detecting a voltage of the node and controlling the switch unit to be closed to allow the circuit device to receive auxiliary power via the switch unit when detecting that the voltage of the node is lower than a first threshold value.