Voltage Drop Compensation for Large AMOLED Displays
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Solution Overview
Problem
Large-sized AMOLED display devices face issues with uneven display brightness due to voltage drops across different pixel rows, caused by varying resistances in signal transmission wires, leading to inconsistent power supply and display effects.
Innovation Solution
A voltage drop compensation method and device that determine impedance distribution across pixel rows, construct a voltage drop model, and perform grayscale compensation based on calculated voltage drops to ensure uniform brightness across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the panel size and resolution of AMOLED display devices are increased, then the visual effect is improved, but the voltage drop across different pixel rows increases, resulting in uneven display brightness
Solution Approach 1:
The patent applies local quality by determining different compensation grayscales for different pixel rows based on their specific positions and impedance characteristics. Each pixel row receives a customized compensation value tailored to its local electrical properties, ensuring uniform brightness across the entire display panel despite variations in wire resistance
Solution Approach 2:
The patent changes the grayscale parameter dynamically for different pixel rows to compensate for voltage drops. By calculating and applying position-dependent compensation grayscales, the system adjusts the driving parameters to maintain consistent display brightness across the panel
2Device complexity
If the same power supply voltage is used for all pixel rows, then the power supply system is simple, but the voltage drop causes different pixel rows to receive different actual voltages, leading to brightness inconsistency
Solution Approach 1:
The patent implements self-service by having the display panel automatically measure its own impedance distribution and calculate compensation values internally. The panel drives itself to achieve uniform brightness without requiring external complex power supply adjustment circuits
Solution Approach 2:
The patent uses feedback by measuring the actual impedance distribution of the display panel and using this information to calculate and apply appropriate compensation grayscales. The system continuously monitors and adjusts based on the measured electrical characteristics to maintain brightness uniformity
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 method and device effectively compensate for voltage drops, ensuring uniform display brightness and improving the overall display effect by adjusting grayscales in real-time, particularly for large-sized AMOLED displays.
Implementation Method 1
because wires for transmitting electrical signals to the respective pixel units correspondingly have different resistances, respectively, and this easily results in a fact that the same power supply voltage signal has different degrees of voltage drop (IR drop) after being transmitted through the wires
Data Source
AI summary
A voltage drop compensation method and a device thereof, and a display device are disclosed. The voltage drop compensation method includes: obtaining an impedance distribution of the plurality of rows of pixels, and constructing a voltage drop model based on the impedance distribution of the plurality of rows of pixels; obtaining a source-end input current of the display panel; determining an input value of the voltage drop model based on the source-end input current, and determining at least one voltage drop corresponding to the at least one pixel row to be compensated according to the input value; and determining, according to the at least one voltage drop, at least one compensation grayscale which is in one-to-one correspondence with the at least one pixel row to be compensated respectively and performing grayscale compensation on the at least one pixel row to be compensated based on the at least one compensation grayscale.