Liquid Crystal Panel Dual Common Line Voltage Segmentation
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Solution Overview
Problem
Conventional liquid crystal panels with dot-inversion driving technology improve display quality but increase power consumption of the source driver, requiring higher output voltage differences to maintain stable liquid crystal voltage, which in turn increases costs.
Innovation Solution
The liquid crystal panel employs two common lines with alternating current voltages of opposite polarities to reduce the voltage difference required by the source driver, allowing it to apply 7.5V to the liquid crystals with a 10V voltage difference, compared to the conventional 15V, thereby decreasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If dot-inversion driving technology is adopted to improve display quality, then display quality is improved, but power consumption of the source driver increases
Solution Approach 1:
The common electrode is divided into two separate common lines (first common line and second common line), each independently controlling different pixel units. This segmentation allows alternating polarity driving where adjacent pixel units have opposite polarities, reducing the voltage difference required from the source driver while maintaining display quality through dot-inversion driving.
Solution Approach 2:
Different pixel units are assigned different polarities through the segmented common lines. First pixel units use one polarity while second pixel units use the opposite polarity, creating local quality differences that enable reduced voltage operation in the source driver while maintaining overall display performance.
2Stability of the object's composition
If higher output voltage difference is used to maintain stable liquid crystal voltage, then liquid crystal voltage stability is improved, but power consumption increases
Solution Approach 1:
The common electrode is segmented into two independent common lines that can be controlled with alternating polarities. This allows the liquid crystal voltage to be maintained stably by distributing the voltage control across two lines with opposite polarities, reducing the required voltage difference from the source driver while preserving voltage stability.
Solution Approach 2:
Instead of using a single common line with high voltage difference, the patent uses two common lines with alternating opposite polarities. This inverted approach maintains voltage stability through polarity alternation rather than high voltage magnitude, reducing power consumption.
Data Source
AI summary
A liquid crystal panel includes a plurality of pixel units, each of which include gating lines, data lines, a pixel electrode and a thin film transistor (TFT). Common electrodes of first pixel units in a same row are electrically connected via a first common line, and common electrodes of second pixel units in the same row are electrically connected via a second common line. The first common line is connected with a first common voltage and the second common voltage is connected with a second common voltage. The first common voltage and the second common voltage are alternating current voltages and have opposite polarities in the same frame. The liquid crystal panel can decrease power consumption of a source driver and lower cost of the liquid crystal panel.