Liquid Crystal Display Pixel Substrate Storage Capacitance
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Solution Overview
Problem
The use of Demux drive solutions for reducing power consumption in LCD devices leads to two different feed-through voltages that affect the common electrode voltage, thereby impacting the display effect of liquid crystal display devices.
Innovation Solution
A pixel substrate is designed with liquid crystal pixels, TFTs, source lines, grid lines, and storage capacitances, where each source line is connected to the source/drain electrodes of multiple pixel units, and the storage capacitance of one column of pixel units is set to be larger than that of any other column, optimizing the storage capacitance distribution to mitigate the effects of feed-through voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If Demux drive solution is used to reduce power consumption, then power consumption is reduced, but feed-through voltages affect common electrode voltage and display effect deteriorates
Solution Approach 1:
The patent applies local quality by differentiating storage capacitance values across different pixel columns. Specifically, first pixel columns (containing first and second pixel units) are assigned a first storage capacitance value, while second pixel columns (containing third and fourth pixel units) are assigned a second storage capacitance value. This localized differentiation compensates for the feed-through voltage effects that vary by column position, thereby maintaining display quality while preserving the power-saving benefits of the Demux drive solution.
2Device complexity
If Demux drive solution is used, then number of source lines is reduced, but two different feed-through voltages affect common electrode voltage
Solution Approach 1:
The patent employs parameter changes by modifying the storage capacitance values assigned to different pixel columns based on their specific feed-through voltage characteristics. First pixel columns experience a first feed-through voltage and are compensated with a first storage capacitance value, while second pixel columns experience a second feed-through voltage and are compensated with a second storage capacitance value. This parameter differentiation neutralizes the harmful feed-through voltage effects while maintaining the reduced source line configuration.
3Reliability
If storage capacitance is increased to compensate for feed-through voltage, then display quality improves, but power consumption increases
Solution Approach 1:
Rather than uniformly increasing storage capacitance across all pixels, the patent applies local quality by selectively assigning different capacitance values only to specific pixel columns that require compensation. This targeted approach improves display quality where needed while avoiding unnecessary capacitance increases in columns that do not require compensation, thereby minimizing the impact on power consumption.
Solution Approach 2:
The patent uses parameter changes to optimize the balance between display quality and power consumption. By adjusting storage capacitance values specifically for first and second pixel columns based on their feed-through voltage characteristics, the system achieves adequate display quality compensation without the excessive power consumption that would result from uniformly increasing capacitance across all pixels.
Data Source
AI summary
The present disclosure provides a pixel substrate, a liquid crystal display panel and liquid crystal display device, the pixel substrate includes liquid crystal pixels, TFT, source lines, grid lines, common electrodes, and corresponding storage capacitances, the liquid crystal pixels include a plurality of pixel units, each of the source lines is connected to the source/drain electrode of at least two columns of the pixel units, and the storage capacitance corresponding to one column of the pixel units is larger than the storage capacitance corresponding to any other column of the pixel units. The present disclosure reduces the effect of the feed-through voltage on the display effect while reducing the power consumption.