LCD Pixel Drain Electrode Symmetry for Crosstalk Reduction
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Solution Overview
Problem
Liquid crystal displays (LCDs) using column inversion drive methods experience image quality degradation and vertical crosstalk when displaying boxes with higher gray levels than the background, and vertical flickering occurs due to differences in data voltages of positive and negative polarity.
Innovation Solution
The LCD design incorporates pairs of first and second pixels with specific sub-pixel electrode configurations, where the first and second drain electrodes are connected in a symmetrical manner to minimize polarity differences across data lines, ensuring uniform optical characteristics and preventing image quality degradation during column inversion drive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If column inversion drive method is used to minimize power consumption, then power consumption is reduced, but image quality degrades and vertical crosstalk occurs
Solution Approach 1:
The pixel electrode is divided into first and second sub-pixel electrodes, and the drain electrode is divided into first and second drain electrodes. This segmentation allows independent control of voltage application to different sub-regions, enabling the system to maintain image quality while using column inversion drive by compensating for polarity-induced distortions in specific sub-pixel regions.
Solution Approach 2:
Different sub-pixel electrodes are assigned different connection configurations to adjacent data lines. The first sub-pixel electrode connects to the first data line while the second sub-pixel electrode connects to the second data line, creating local variations in electrical characteristics that compensate for the global polarity inversion effect, thereby maintaining uniform image quality across the display.
2Use of energy by moving object
If column inversion drive is applied, then power consumption decreases, but vertical crosstalk and gray level distortion occur
Solution Approach 1:
By segmenting the pixel electrode into sub-pixel electrodes with different data line connections, the patent creates localized electrical pathways that are less susceptible to vertical crosstalk. The first sub-pixel electrode connected to the first data line and the second sub-pixel electrode connected to the second data line experience different electromagnetic interference patterns, reducing the cumulative crosstalk effect.
Solution Approach 2:
The asymmetric connection configuration where adjacent pixels have different sub-pixel to data line mappings breaks the symmetry of the column inversion drive pattern. This asymmetry prevents the constructive interference that causes vertical crosstalk and gray level distortion, allowing power-saving inversion drive to function without these harmful effects.
3Productivity
If data voltages of same polarity are applied vertically, then column inversion drive is enabled, but vertical flickering occurs due to polarity differences
Solution Approach 1:
The segmentation of pixel electrodes into sub-pixel electrodes with alternating data line connections creates a staggered polarity pattern across the display. During column inversion drive, adjacent sub-pixels experience different polarity sequences, which when viewed collectively, average out the flickering effect and maintain stable optical characteristics throughout the frame cycle.
Solution Approach 2:
The patent utilizes the periodic nature of the column inversion drive cycle in combination with the segmented electrode structure. The alternating polarity applications to different sub-pixel groups create a periodic pattern that, when integrated across the entire display, produces stable average optical output, eliminating vertical flickering while maintaining high frame speed capability.
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 maintains minimal or no degradation of image quality and achieves uniform optical characteristics for all pixels, reducing vertical crosstalk and flickering issues.
Implementation Method 1
applying voltages to the field-generating electrodes to generate an electric field in the LC layer that determines the orientations of LC molecules therein to adjust polarization of incident light
Implementation Method 2
adjust polarization of incident light
Implementation Method 3
An LCD displays images by applying voltages to the field-generating electrodes to generate an electric field in the LC layer that determines the orientations of LC molecules therein
Data Source
AI summary
A liquid crystal display includes first pixels and second pixels, a plurality of gate lines to transmit gate signals, and a plurality of pairs of first and second data lines crossing the gate lines, the pairs of first data lines and second data lines facing each other with a pixel interposed there between. Each of the first pixels and the second pixels includes pixel electrode and each pixel electrode includes a first sub-pixel electrode and a second sub-pixel electrode. A first drain is electrode disposed on the right of the first data line, and a second drain electrode is disposed on the left of the second data line. The first drain electrode is connected to the first sub-pixel electrode while the second drain electrode is connected to the second sub-pixel electrode in the first pixels, and the first drain electrode is connected to the second sub-pixel electrode while the second drain electrode is connected to the first sub-pixel electrode in the second pixels. The first drain electrode of the first pixel has substantially the same shape as the second drain electrode of the second pixel, and the first drain electrode of the second pixel has substantially the same shape as the second drain electrode of the first pixel.