Row Drive Circuit Pre-Charging for Display Panel Bright Line Elimination
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Solution Overview
Problem
Liquid crystal display panels with dual-gate pixel driving structures face issues with inconsistent charging of adjacent pixels due to excessive step-voltage in the data signal, leading to reduced image quality and the formation of bright and dark lines.
Innovation Solution
A row drive circuit with cascaded row drive units and auxiliary circuit units that pre-charge and control the charging of sub-pixels, using timing signals to manage the gate driving signals and prevent inconsistent charging by skipping pre-charging when necessary, ensuring all sub-pixels are fully charged and have the same brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual-gate pixel driving structure is used to send two dot signals, then flicker of images is prevented, but charging consistency of adjacent pixels is affected due to excessive step-voltage in data signal
Solution Approach 1:
The patent introduces a pre-charging phase before the main charging phase. The first gate driving signal pre-charges the pixel electrodes to an initial voltage level, and then the second gate driving signal completes the charging to the target voltage. This preliminary action allows the pixel to gradually adapt to voltage changes, reducing the impact of excessive step-voltage and ensuring consistent charging across adjacent pixels while maintaining the dual-gate flicker prevention mechanism.
2Manufacturing precision
If pre-charging is performed for all rows, then charging completeness is improved, but display quality deteriorates due to bright and dark lines caused by inconsistent charging
Solution Approach 1:
The patent implements selective pre-charging based on the polarity of the data signal. The control circuit determines whether pre-charging should be applied to each row based on the data signal polarity, enabling the row drive circuit to skip pre-charging for certain rows. This local differentiation ensures that pre-charging is applied only where needed, maintaining charging completeness while avoiding the bright and dark line artifacts that would result from uniform pre-charging across all rows.
Solution Approach 2:
The patent makes the pre-charging function dynamic and conditional rather than static and universal. The row drive circuit can dynamically adjust whether to perform pre-charging based on real-time data signal polarity detection. This dynamic control allows the system to optimize charging completeness for each specific case while maintaining display quality, eliminating the fixed pre-charging approach that causes uniform brightness issues.
Data Source
AI summary
Disclosed are a row drive circuit (100) of an array substrate and a display device. The row drive circuit (100) includes N row drive units (10) arranged in cascade and auxiliary circuit units (20). The Nth row drive unit (10) is configured to output Nth gate driving signal to pre-charge and charge the Nth row of sub-pixels, when its signal input end receives the gate driving signal output by (N−2)th row drive unit (10). The Nth auxiliary circuit unit (20) is configured to control Nth row drive unit (10) skip pre-charging the sub-pixels, when (N−1)th timing control signal received by the first timing signal input end of Nth auxiliary circuit unit (20) and (N+1)th timing control signal received by the second timing signal input end of Nth auxiliary circuit unit (20) are high level. N is positive integer greater than or equal to two. The present disclosure solves the problem that the charging saturation of two adjacent pixels which both share one data line is inconsistent due to the large step voltage of the data voltage, when the data signal is converted. As such bright lines and dark lines may be generated in the display panel. Therefore, the display device has a good displaying effect.