Display Panel Driving Method for Brightness Uniformity
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Solution Overview
Problem
Existing display panels face issues with brightness uniformity due to resistance-capacitance (RC) accumulation in the driving circuit, leading to differences in data signal reception between near-end and far-end sub-pixels, especially in large-size displays with high refresh rates, resulting in non-uniform brightness.
Innovation Solution
A method for driving a display panel that involves calculating gray scale difference values and using a look-up table to determine gray scale compensation values for each sub-pixel, adjusting the duration of data signal provision to ensure consistent charging times across rows, and employing a data line multiplexing circuit to electrically couple driving terminals with data lines, thereby compensating for RC effects and improving brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If column inversion driving is used in RGBW product, then liquid crystal performance is improved, but brightness uniformity deteriorates due to source drive circuit toggle state
Solution Approach 1:
The patent applies local quality by differentiating the driving approach for odd and even rows. Odd rows use column inversion driving while even rows use normal driving, allowing each row type to be optimized for its specific characteristics. This local differentiation resolves the brightness uniformity issue caused by universal column inversion driving while maintaining liquid crystal performance benefits where applicable.
2Ease of operation
If data signals are provided to all rows with equal duration, then driving simplicity is maintained, but brightness uniformity deteriorates due to RC accumulation differences
Solution Approach 1:
The patent changes the time parameter of data signal provision based on row position. Rows farther from the driver IC are allocated longer data signal durations to compensate for RC accumulation effects. This parameter adjustment ensures that all rows achieve comparable voltage levels despite different electrical path characteristics, resolving brightness uniformity issues while maintaining practical driving complexity.
3Device complexity
If gray scale compensation is not applied, then device complexity is reduced, but brightness uniformity deteriorates due to RC effects
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing gray scale compensation values in lookup tables (LUTs) before actual image display. The compensation values are determined based on row position and theoretical gray scale levels. During operation, the driver simply retrieves pre-computed compensation values rather than calculating them in real-time, achieving brightness uniformity improvement with minimal additional computational complexity.
Data Source
AI summary
The present application provides a method for driving a display panel, including: providing data signals to M rows of sub-pixels, wherein providing data signals to an X-th row of sub-pixels includes: determining, for each sub-pixel in the X-th row, a grayscale compensation value for a data signal provided to the sub-pixel; determining, for each sub-pixel, an actual grayscale corresponding to the sub-pixel according to the grayscale compensation value and a theoretical grayscale value Lx of the sub-pixel; and providing the data signals to the X-th row of sub-pixels according to the actual grayscales corresponding to the respective sub-pixels in the X-th row. The grayscale compensation value is determined by: calculating a grayscale difference δ by a formula δ=Lx−Lx-1, where grayscale Lx-1 is a theoretical grayscale of an adjacent sub-pixel in an (X−1)-th row; and determining the grayscale compensation value according to the grayscale difference and a grayscale compensation look-up table.