LCD Sub-Pixel Interleaving for Flicker Reduction
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Solution Overview
Problem
LCDs face issues with Vcom coupling and flicker due to inverted data signal polarity from adjacent data lines, affecting display performance, especially when displaying RGBW colors.
Innovation Solution
The LCD design involves interleaving sub-pixels of the same color along the column direction and applying data signals with alternating polarities to adjacent sub-pixels, using a data driver with opposite polarity output ports to connect data lines directly or in a cross manner, ensuring equal positive and negative polarities for each color sub-pixel during pure color frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inverted data signal polarity is applied from adjacent data lines to sub-pixels, then grayscale display is achieved, but Vcom coupling and flicker issues occur
Solution Approach 1:
The patent applies different polarity patterns to different regions (rows and columns) of the display panel. Specifically, even-numbered rows use one polarity pattern while odd-numbered rows use the opposite pattern, and similarly for columns. This local differentiation eliminates the uniform polarity inversion that causes Vcom coupling and flicker, while maintaining grayscale display capability through controlled polarity variation in each local region.
Solution Approach 2:
The patent inverts the conventional approach by using double inversion (both row and column inversion) instead of simple column inversion. By inverting polarity in both dimensions and ensuring equal numbers of positive and negative polarities within each color period, the harmful coupling effects are cancelled out while the desired grayscale control is maintained.
2Ease of operation
If dot inversion or column inversion is used for grayscale display, then sub-pixel control is achieved, but adjacent rows have inverse polarity causing display issues
Solution Approach 1:
The patent segments the display panel into multiple independent inversion regions defined by row and column groups. Each segment can have its own polarity pattern, allowing independent optimization. By dividing the display into segments with controlled polarity distributions, the patent achieves both ease of grayscale control and high display performance without the inverse polarity issues of conventional methods.
3Illumination intensity
If RGBW color display is implemented with conventional polarity inversion, then color transmission is improved, but data transient causes serious Vcom coupling
Solution Approach 1:
The patent implements periodic polarity reversal within each color period, ensuring that positive and negative polarities are equally distributed. This periodic action maintains the high brightness of RGBW display while systematically eliminating Vcom coupling that occurs during data transients, as the coupled signals cancel out over each complete period.
Data Source
AI summary
A LCD includes the sub-pixels arranged at least in two adjacent rows. The sub-pixels of the same color are interleaved with each other along the column direction. When the LCD displays a pure color frame, within the even-number arranging periods of the sub-pixels arranged along the column direction, a number of the sub-pixels of the same color being applied with the data signals having positive polarity are the same with the sub-pixels of the same color being applied with the data signals having negative polarity. In this way, the common electrode coupling caused by the transition of the data signals may be avoided. This eliminates the flicker issues and enhances the display performance of the LCD.