Display Device Sub-pixel Polarity Inversion for Vertical Crosstalk Reduction
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Solution Overview
Problem
Liquid crystal display devices face vertical crosstalk issues due to parasitic capacitance coupling, which affects the uniformity and quality of the display frame.
Innovation Solution
A display device with a specific pixel drive arrangement where sub-pixels are connected to interleaved gate and data lines, using opposite polarities on adjacent data lines to offset parasitic capacitance, achieving a positive-to-negative polarity ratio of 1:1 for bright area sub-pixels in the column direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the same colors of sub-pixels are arranged in a checkerboard pattern with 4-domain two-pixel rendering technology, then the aperture ratio and view angle are increased, but vertical crosstalk is induced due to parasitic capacitance coupling
Solution Approach 1:
The patent applies asymmetry by using different polarity arrangements for odd and even data lines. Odd data lines use one polarity sequence while even data lines use the opposite polarity sequence, creating an asymmetric driving pattern that prevents uniform parasitic capacitance coupling across all pixels, thereby eliminating vertical crosstalk while maintaining the checkerboard pattern benefits
Solution Approach 2:
The patent inverts the polarity sequence for adjacent data lines. While one data line drives sub-pixels with a positive-negative-positive sequence, the adjacent data line uses a negative-positive-negative sequence. This inversion causes the parasitic capacitance effects to oppose each other, canceling out the vertical crosstalk that would otherwise be generated by the checkerboard pattern arrangement
2Stability of the object's composition
If the checkerboard pattern arrangement of 4-domain sub-pixels with two different polarities is used, then the flicker of the display frame is decreased, but the frame taste is deteriorated due to induced vertical crosstalk
Solution Approach 1:
The patent introduces asymmetry in the driving scheme by assigning different polarity sequences to odd and even data lines. This asymmetric approach maintains the beneficial flicker-reduction effect of the checkerboard pattern while breaking the symmetry that causes uniform parasitic capacitance coupling, thereby eliminating vertical crosstalk and improving frame taste
Solution Approach 2:
The patent employs periodic polarity inversion in the driving sequence. By systematically alternating the polarity sequence between adjacent data lines and between different scanning periods, the patent creates a periodic pattern that averages out the parasitic capacitance effects over time, reducing vertical crosstalk while preserving the display frame uniformity achieved through the checkerboard arrangement
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 enhances the uniformity and quality of the display frame by eliminating vertical crosstalk and improving the frame's appearance.
Implementation Method 1
A liquid crystal display device mainly utilizes an electric field to control rotations of liquid crystal molecules to make light rays penetrate through the liquid crystal molecules to display an image
Implementation Method 2
control rotations of liquid crystal molecules
Implementation Method 3
the same colors of sub-pixels cannot mutually offset in one frame time due to the parasitic capacitance coupling, so that the vertical crosstalk of the display frame is induced
Data Source
AI summary
A display device is disclosed. Plural sub-pixels of display panel are electrically connected to a gate line set of corresponding row. Each data line is electrically connected to two adjacent sub-pixels of same pixel. The first gate line of each gate line set is electrically connected to one of odd-numbered and even-numbered ones of sub-pixels of pixels of same row. The second gate line of each gate line set is electrically connected to the other one of the odd-numbered and even-numbered ones of sub-pixels of pixels of same row. In one frame time, the data signal drives the two adjacent sub-pixels of same pixel through the nth and (n+1)th data lines using opposite polarities, and the data signal drives the column-direction adjacent two sub-pixels through the nth and (n+1)th data lines using opposite polarities.