Voltage Drop Compensation for In-Panel Display Power Supply
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Solution Overview
Problem
Large display panels face issues with poor brightness uniformity and high power consumption due to voltage drops in the power supply, leading to cross talk effects and instability in display performance.
Innovation Solution
A voltage drop compensation system comprising a voltage detection circuit and a voltage compensation circuit, connected to each row of pixel units via an ELVDD signal line, which detects real-time voltages and compensates data voltages to maintain equal absolute voltage differences, thereby stabilizing brightness and reducing cross talk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display screen size increases, then the display area is enlarged, but the trace impedance of the power supply voltage signal line increases causing voltage drop
Solution Approach 1:
The power supply voltage signal line is divided into multiple segments, each with its own compensation circuit. The display screen is divided into multiple regions (first display region, second display region, third display region) with different compensation strategies applied to each region based on their specific voltage drop characteristics.
Solution Approach 2:
The compensation circuit dynamically adjusts compensation voltages based on detected voltage drops. Different compensation voltages are applied to different regions: a first compensation voltage to the first display region, a second compensation voltage to the second display region, and a third compensation voltage to the third display region, optimizing power delivery across the entire large screen.
2Area of stationary object
If voltage drop occurs in the power supply line, then the display area can be large, but brightness uniformity deteriorates
Solution Approach 1:
Different compensation strategies are applied to different regions of the display. The first display region receives a first compensation voltage, the second display region receives a second compensation voltage, and the third display region receives a third compensation voltage, tailored to the specific voltage drop characteristics of each region.
Solution Approach 2:
The compensation circuit includes a detection function that monitors voltage drops in real-time and automatically adjusts compensation voltages accordingly. The circuit detects the actual voltage at pixel units and applies appropriate compensation to maintain uniform brightness across the display.
3Reliability
If voltage drop occurs in the power supply line, then the display can function, but power consumption increases
Solution Approach 1:
The compensation circuit proactively compensates for voltage drops before they affect display performance. By detecting voltage drops and applying compensation voltages in advance, the system maintains proper pixel unit operation without requiring increased overall power consumption.
Solution Approach 2:
The system dynamically adjusts compensation voltages based on actual voltage drop conditions. By optimizing the compensation voltage magnitude for each region's specific needs, the system maintains display functionality while minimizing unnecessary power consumption.
4Reliability
If voltage drop occurs in the power supply line, then the display can operate, but cross talk effect worsens
Solution Approach 1:
The compensation circuit continuously monitors voltage conditions and adjusts compensation voltages to maintain stable pixel unit operation. This feedback mechanism prevents voltage fluctuations that could cause cross-talk between adjacent pixel units, ensuring clean signal transmission.
Solution Approach 2:
Regional compensation strategies are applied to different display regions, with each region receiving tailored compensation voltages based on its specific electrical characteristics. This localized approach stabilizes voltage levels locally, preventing signal interference and cross-talk effects.
Data Source
AI summary
A voltage drop compensation system and method for a power supply inside a display panel, to solve technical problems of poor uniformity of screen brightness and high power consumption of the whole screen due to voltage drop of the power supply inside the display panel. The voltage drop compensation system includes a voltage detection circuit and a voltage compensation circuit, where the voltage detection circuit is configured to detect an ELVDD voltage of pixel units in each row; and the voltage compensation circuit is configured to compensate a data voltage of pixel units in each row based on a detected ELVDD voltage.