Liquid Crystal Display Scan Line RC Delay Compensation
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Solution Overview
Problem
Liquid crystal display panels suffer from non-uniform brightness due to differences in charging rates of sub-pixels caused by RC delays and inversion driving modes, resulting in bright and dark lines across the display.
Innovation Solution
Configuring different RC delays for scan lines by varying their resistance and width, ensuring that sub-pixels receive consistent charging rates and sustaining voltages, thereby eliminating brightness inconsistencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If HSD pixel array with 2H line inversion driving mode is used, then the number of data lines is reduced by half, but the charging time of each sub pixel is reduced and brightness uniformity deteriorates
Solution Approach 1:
The patent applies local quality by configuring different RC delay values for different scan lines. Specifically, scan lines are divided into first scan lines and second scan lines, with the second scan lines having larger RC delays than the first scan lines. This local differentiation compensates for the charging time reduction caused by the 2H inversion driving mode, ensuring that sub pixels connected to second scan lines receive adequate charging despite the reduced scanning time distributed to each scan line.
2Productivity
If 2H line inversion driving mode is used, then the scanning time distributed to each scan line is decreased, but the charging rate difference between odd and even columns increases
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring different RC delay values for different scan lines before the charging process begins. The second scan lines are designed with larger RC delays to counteract the delayed charging effect that would otherwise occur in even-numbered columns. This preliminary compensation ensures that when the 2H inversion driving mode reduces scanning time per scan line, the charging rate consistency across all columns is maintained through the pre-established RC delay differences.
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 solution achieves spatially uniform brightness across the liquid crystal display panel by compensating for charging rate differences, eliminating bright and dark lines.
Implementation Method 1
An RC delay of the second scan line is larger than that of the first scan line, so that a difference of charging rate of the data line to the first sub pixel from that of the data line to the second sub pixel can be compensated
Data Source
AI summary
A liquid crystal display panel is provided, comprising a plurality of sub pixels arranged in a pixel array, which is formed by a plurality of data lines and a plurality of scan lines perpendicular to each other. The plurality of scan lines comprises a first scan line connected with a first sub pixel, the first scan line being enabled within a first time period after a polarity inversion of a drive signal level of a data line, and at least one second scan line being enabled within a second time period after the first time period. An RC delay of the second scan line is larger than that of the first scan line.