Alternating Pixel Data Line Connections for LCD Crosstalk Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal displays (LCDs) face issues with crosstalk and flicker due to coupling between data lines and pixel electrodes, which affect lateral visibility.
Innovation Solution
A display device configuration with high level and low level pixels, where data voltages of the same and different polarities are applied to specific data lines, and the connection direction between pixels and data lines is alternated in odd and even-numbered pixel rows, ensuring equal numbers of high and low level pixels connect to positive and negative data lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data voltages are applied to data lines connected to pixels, then image display function is achieved, but crosstalk occurs due to coupling between data lines and pixel electrodes
Solution Approach 1:
The patent applies periodic polarity inversion to data line voltages, alternating between positive and negative polarities in a systematic pattern. This periodic action causes the coupling effect between data lines and pixel electrodes to oscillate, making the crosstalk signal average to zero over time, thereby eliminating visible crosstalk while maintaining normal image display functionality
Solution Approach 2:
The patent changes the voltage polarity parameter of data lines dynamically, applying different polarities (positive and negative) to different data lines or alternating polarities over time. This parameter change transforms the static coupling problem into a dynamic situation where the coupling effect cancels itself out, reducing crosstalk without affecting the liquid crystal modulation function
2Reliability
If data voltages are applied to data lines connected to pixels, then image display function is achieved, but flicker occurs due to coupling between data lines and common electrodes
Solution Approach 1:
The patent employs periodic polarity inversion of data line voltages, systematically alternating between positive and negative polarities. This periodic action causes the coupling-induced voltage fluctuations at the common electrode to oscillate at a frequency that is not visible to the human eye, thereby eliminating perceptible flicker while maintaining stable image display
Solution Approach 2:
The patent dynamically changes the voltage polarity parameter of data lines, applying alternating positive and negative voltages. This parameter modulation transforms the static coupling problem into a dynamic situation where the coupling effect produces high-frequency voltage variations that do not manifest as visible flicker, ensuring display stability
3Reliability
If equal numbers of high and low level pixels connect to positive and negative data lines, then crosstalk and flicker are reduced, but device complexity increases due to alternating connection directions
Solution Approach 1:
The patent segments the pixel array into regions with alternating connection patterns, where odd and even pixel rows connect to data lines in opposite directions. This segmentation allows equal distribution of high and low level pixels to positive and negative data lines, achieving crosstalk and flicker reduction through systematic polarity balancing while maintaining manageable structural complexity
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 improves lateral visibility by preventing crosstalk and flicker, maintaining equivalence in pixel connections regardless of data voltage polarity, thereby enhancing the display's overall performance.
Implementation Method 1
Voltage applied to the electrodes form an electric field so as to align liquid crystal molecules of the liquid crystal layer, to control transmittance of light
Data Source
AI summary
A display device includes a display panel including unit areas. Each of the unit areas includes pixels arranged in a matrix formation; and data lines (DLs) connected to the pixels. The display device is configured to: apply data voltages of a same polarity to first DLs positioned between adjacent pixel columns; and apply DVs of different polarities to second DLs positioned at respective sides of each pixel column. Each of the pixels is connected to one of the second DLs. A connection direction between the pixels and the DLs in each of a plurality of pixel rows is changed in a determined pixel column interval. Connection directions between the pixels and the DLs are opposite each other in odd-numbered pixel rows adjacent in a column direction. Connection directions between the pixels and the DLs are opposite each other in even-numbered pixel rows adjacent in the column direction.