Liquid Crystal Panel Driving Method for RC Delay Compensation
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Solution Overview
Problem
Conventional liquid crystal panels with dual gate line and single data line architecture face issues with uneven display brightness due to RC delay in signal transmission lines, leading to insufficient charging of sub-pixels and affected display quality.
Innovation Solution
A driving method and device that utilize position and compensation lookup tables to determine target sub-pixels requiring grayscale compensation, using adjacent sub-pixels for compensation, and adjust grayscale values to match adjacent sub-pixels, thereby improving display brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the impedance of the signal transmission line is reduced by using high conductivity material, then the RC delay is reduced, but the manufacturing cost increases greatly
Solution Approach 1:
The patent changes the driving method parameters (polarity inversion pattern) from conventional 2-dot inversion to a pattern where sub-pixels connected to the same data line have different polarity inversion timing. This parameter change in the driving scheme resolves the RC delay issue without requiring hardware changes to the transmission line material, thus avoiding increased manufacturing cost while improving signal transmission effectiveness
2Speed
If the width of the signal transmission line is increased to reduce impedance, then the RC delay is reduced, but the aperture ratio of the panel decreases
Solution Approach 1:
The patent resolves this contradiction by changing the electrical driving parameters (polarity inversion timing) rather than modifying the physical dimensions of the transmission line. The different polarity inversion timing for sub-pixels on the same data line compensates for RC delay effects without requiring wider transmission lines, thus preserving the aperture ratio while achieving uniform sub-pixel charging
Solution Approach 2:
The patent replaces the mechanical/physical solution (increasing transmission line width) with an electrical control solution (different polarity inversion timing). This substitution allows the system to achieve the same functional goal of reducing RC delay impact without the physical constraints that would reduce the aperture ratio
3Stability of the object's composition
If 2-dot inversion driving method is used to reduce image flicker, then image flicker is reduced, but uneven brightness of adjacent sub-pixels occurs due to RC delay
Solution Approach 1:
The patent applies local quality by implementing different polarity inversion timing specifically for sub-pixels connected to the same data line, while maintaining the overall 2-dot inversion framework. This localized adjustment compensates for RC delay effects on specific sub-pixels without disrupting the global image stability provided by the 2-dot inversion method
Solution Approach 2:
The patent segments the polarity inversion control by applying different inversion timing to different groups of sub-pixels (those connected to the same data line). This segmentation allows independent optimization of charging characteristics for each group, resolving the brightness uniformity issue while maintaining overall image 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 method ensures that sub-pixels with insufficient charging are adequately compensated, resulting in consistent display brightness between adjacent sub-pixels, addressing the issue of uneven brightness caused by RC delay without increasing hardware costs.
Implementation Method 1
The liquid crystal panel technology is a display technology of rotating a specific angle based on a voltage applied onto a liquid crystal molecule. By changing a driving voltage applied onto two ends of the liquid crystal molecule, the liquid crystal molecule is driven to generate a corresponding rotation, a propagation direction of light of a light source generated from a backlight unit is changed
Data Source
AI summary
A driving method and a driving device of a liquid crystal panel are provided. The driving method includes: creating a position lookup table provided with a first value and a second value respectively indicating a sub-pixel not requiring grayscale compensation and a target sub-pixel requiring grayscale compensation and further for indicating which reference sub-pixel will be used for performing grayscale compensation; creating a compensation lookup table and setting a compensated grayscale value of the target sub-pixel according to a one-to-one relationship between a current grayscale value of the target sub-pixel and a grayscale value of a corresponding reference sub-pixel; and during driving the liquid crystal panel to display, determining the target sub-pixel requiring grayscale compensation and obtaining the corresponding reference sub-pixel according to the position lookup table, obtaining the compensated grayscale value from the compensation lookup table and driving the target sub-pixel to display according to the compensated grayscale value.