Display Grayscale Compensation for Transmission-Line Voltage Drops
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Solution Overview
Problem
Voltage drops along data and source driver power lines in display panels cause uneven grayscale rendering due to impedance, affecting display quality.
Innovation Solution
A display device incorporating a data conversion circuit, voltage drop estimation circuit, and compensation circuit to convert grayscale data into current data, estimate transmission line voltage drops, and generate pixel compensation values to compensate for these drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If data lines and source driver power lines are used to transmit signals and power across the display panel, then the display panel can be driven with multiple source drivers, but voltage drops occur due to impedance, causing uneven grayscale rendering
Solution Approach 1:
The patent applies preliminary action by estimating voltage drops and calculating compensation values before actual grayscale data is transmitted. The compensation values are pre-calculated based on pixel position and transmission line characteristics, then applied to adjust the grayscale data in advance, ensuring uniform grayscale rendering despite voltage drops during transmission
Solution Approach 2:
The patent changes parameters by adjusting grayscale data values based on position-dependent compensation factors. Different pixel positions receive different compensation values to counteract position-specific voltage drops, transforming the uniform grayscale input into position-adjusted grayscale output that compensates for transmission losses
2Adaptability or versatility
If multiple source drivers are connected to the same source driver power line, then the display panel can be driven with multiple source drivers, but different voltage drops occur at different positions of the power line
Solution Approach 1:
The patent applies local quality by providing position-specific compensation values to different pixel groups based on their location relative to source drivers. Each region receives tailored compensation according to its specific voltage drop characteristics, allowing the system to maintain reliable operation across multiple source driver connections with varying impedance conditions
Data Source
AI summary
A display device and a grayscale compensation method thereof. The display device includes a data conversion circuit, a voltage drop estimation circuit, and a compensation circuit. The data conversion circuit converts a plurality of original grayscale data of a target pixel block into current data. The voltage drop estimation circuit converts the current data into transmission line voltage drop information of the target pixel block. The compensation circuit converts the transmission line voltage drop information into at least one pixel compensation value of the target pixel block, and uses the at least one pixel compensation value to compensate the original grayscale data of the target pixel block, so as to generate a plurality of compensated grayscale data of the target pixel block.