Liquid Crystal Display Panel Data Line Crosstalk Compensation
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Solution Overview
Problem
Liquid crystal display panels experience horizontal crosstalk due to deviations in common electrode voltage caused by capacitive coupling effects from data lines, leading to suboptimal grayscale display and increased complexity in design.
Innovation Solution
The introduction of additional data lines with opposite polarity signals, either per column or per group of columns, ensures that the sum of signal changes is zero, neutralizing the capacitive coupling effect and maintaining the common electrode voltage within predetermined limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional data lines with opposite polarity signals are introduced, then horizontal crosstalk is reduced and common electrode voltage stability is improved, but device complexity increases
Solution Approach 1:
The patent introduces compensation data lines that carry signals with opposite polarity to the original data lines. These compensation signals act as counterweights that neutralize the capacitive coupling effects, thereby stabilizing the common electrode voltage and reducing horizontal crosstalk.
Solution Approach 2:
The patent converts the harmful capacitive coupling effect into a beneficial compensation mechanism. By intentionally introducing compensation data lines that generate opposite polarity signals, the harmful coupling effect is transformed into a useful compensation effect that stabilizes the common electrode voltage.
2Manufacturing precision
If compensation data lines are added to neutralize capacitive coupling, then horizontal crosstalk is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent segments the data line function into two independent parts: original data lines for pixel driving and compensation data lines for coupling neutralization. This segmentation allows each type of data line to perform its specific function independently, improving grayscale precision while maintaining manageable manufacturing complexity through functional separation.
3Stability of the object's composition
If data lines with opposite polarity signals are used, then common electrode voltage deviation is reduced, but device structure becomes more complex
Solution Approach 1:
The compensation data lines serve as intermediary elements that mediate between the original data lines and the common electrode. These intermediaries carry opposite polarity signals that neutralize the direct coupling effect, thereby stabilizing the common electrode voltage waveform without requiring fundamental changes to the basic display structure.
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 approach significantly reduces horizontal crosstalk and simplifies the manufacturing process by maintaining the common electrode voltage stability, enhancing display performance and production yield.
Implementation Method 1
there is a parasitic capacitance Cpc between the data line and an upper plate common electrode, as well as between the data line and a bottom plate common electrode, thus the change of waveform of a common electrode voltage Vcom will be affected under a capacitive coupling effect
Data Source
AI summary
The present disclosure provides a liquid crystal display panel, comprising a plurality of pixels disposed in an array formed by a plurality of data lines and a plurality of scan lines in an orthogonal configuration, wherein the plurality of data lines comprise a first data line corresponding to each column of pixels; and at least one second data line corresponding to each column of pixels or corresponding to at least two adjacent columns of pixels in a group, said at least one second data line not being connected with any pixel in any column, and the sum of change of an input signal of said at least one second data line and that of a pixel driving signal of each column of pixels or of said at least two adjacent columns of pixels in a group being zero, so that a common electrode voltage would not deviate from a predetermined voltage. Therefore, according to the embodiments of the present disclosure, the phenomenon that the common electrode voltage would deviate due to the couple effect of the data lines can be greatly reduced, thus the horizontal crosstalk resulted from the coupled common electrode voltage can be reduced.