Liquid Crystal Display Panel Scan Line Crosstalk Elimination
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Solution Overview
Problem
Existing liquid crystal display panels experience horizontal crosstalk due to deviations in common-electrode voltage caused by capacitive coupling effects between data lines and the common electrode, leading to suboptimal grayscale display.
Innovation Solution
The implementation of at least two scan lines per line of pixels, alternately connected to successive pixels, ensures that the sum of pixel drive signal variations and data line signal variations equals zero, maintaining a predetermined common electrode voltage and thereby eliminating horizontal crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single scan line is used for pixel driving, then the device complexity is reduced, but horizontal crosstalk occurs due to common-electrode voltage deviation caused by capacitive coupling effects
Solution Approach 1:
The patent divides the pixel driving into multiple segments by introducing at least two scan lines (first scan line and second scan line) that alternately drive different pixel groups. This segmentation allows the common electrode voltage to be maintained at a predetermined level by balancing the capacitive coupling effects from adjacent data lines, thereby eliminating horizontal crosstalk while managing device complexity through structured multiplexing.
Solution Approach 2:
The patent implements periodic action by alternately activating the first and second scan lines in sequential time periods. During each time period, only one scan line is active while the other remains inactive, creating a periodic driving pattern that maintains the common electrode voltage at a predetermined level and prevents voltage deviation caused by capacitive coupling.
2Manufacturing precision
If multiple scan lines are introduced to eliminate horizontal crosstalk, then grayscale accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent segments the pixel array into multiple groups driven by different scan lines, allowing precise control of voltage distributions. By dividing the driving task across multiple scan lines that alternately activate, the system achieves accurate grayscale display through balanced capacitive coupling while managing complexity via systematic multiplexing architecture.
Solution Approach 2:
The patent changes the driving parameters by introducing multiple scan lines with alternating activation patterns. This parameter change enables the common electrode voltage to be maintained at a predetermined level, achieving accurate grayscale display. The systematic variation in scan line activation creates balanced electrical conditions that eliminate crosstalk while maintaining manufacturability.
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
This configuration effectively reduces the deviation of common-electrode voltage, eliminating horizontal crosstalk and enhancing the display's grayscale accuracy across the panel.
Implementation Method 1
existence of parasitic capacitors Cpc between the data lines and an upper-plate common electrode and between the data lines and a lower-plate common electrode would influence the waveform of a common-electrode voltage Vcom under the action of capacitive coupling effects
Data Source
AI summary
A liquid crystal display panel and a liquid crystal display comprising the same are disclosed. The liquid crystal display panel comprise: a plurality of pixels configured in an array, which is formed by a plurality of data lines and a plurality of scan lines that are arranged perpendicularly with respect to the plurality of data lines. The plurality of scan lines comprise: at least two scan lines arranged in correspondence with each line of pixels, the at least two scan lines being alternately connected to each successive pixel located in a corresponding line, wherein each line of pixels is scanned in a plurality of individual time periods. During each time period, when pixel drive signals are input into pixels connected to one of the at least two scan lines via corresponding data lines, the sum of the variation of the pixel drive signals and the variation of input signals of data lines corresponding to pixels connected to the rest of the at least two scan lines equals 0, so that a common electrode voltage will not deviate from a pre-determined voltage. As a result, the phenomenon of deviation generated due to couplings of the common-electrode voltage to data lines can be largely relieved, thus eliminating the phenomenon of horizontal crosstalk caused thereby in the prior art.