LCD Data Modulator for 2-Dot Inversion Brightness Deviation
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Solution Overview
Problem
The 2-dot inversion method in liquid crystal display (LCD) devices experiences brightness deviation between pixel cells due to varying charging speeds when data signal polarities change, leading to inefficient power consumption and image quality issues.
Innovation Solution
A liquid crystal display device and method that modulates the grayscale value of data signals to compensate for brightness deviations by alternately outputting first and second-polarity data signals at intervals of at least two successive periods, using a data modulator to adjust the voltage levels of the data signals supplied to the data lines, ensuring consistent image display across pixel cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If 2-dot inversion method is used to reduce power consumption, then power consumption is reduced, but brightness deviation occurs between pixel cells
Solution Approach 1:
The patent applies parameter changes by adjusting the grayscale values of data signals based on their polarity. Specifically, when polarity inversion occurs between adjacent pixel cells, the grayscale values are modified to compensate for the brightness deviation caused by the polarity change. This allows the 2-dot inversion method to maintain both low power consumption and uniform brightness across all pixel cells.
2Stability of the object's composition
If polarity inversion is performed between adjacent pixel cells, then flicker is reduced, but charging speed varies causing brightness deviation
Solution Approach 1:
The patent compensates for the charging speed variation by dynamically adjusting the grayscale values of data signals. When polarity inversion causes charging speed differences between adjacent pixel cells, the grayscale parameters are modified to ensure that all pixel cells achieve the same brightness level, thereby maintaining flicker reduction while eliminating brightness deviation.
3Adaptability or versatility
If data signal polarity changes between periods, then inversion driving is achieved, but charging speed reduces causing brightness deviation
Solution Approach 1:
The patent maintains inversion driving capability while compensating for charging speed reduction by adjusting the grayscale values of data signals. When polarity changes between periods, the grayscale parameters are modified to ensure consistent charging performance and uniform brightness across all pixel cells, thereby preserving the benefits of inversion driving without the associated brightness deviation.
Data Source
AI summary
An LCD device includes at least one data line, a plurality of first pixel cells connected in common to one side of the data line, a timing controller for alternately outputting first and second-polarity data signals at intervals of at least two successive periods, a data modulator for outputting the first and second-polarity data signals supplied from the timing controller, the data modulator modulating a grayscale value of one of the first and second-polarity data signals respectively supplied in two successive periods from the timing controller, and outputting the modulated data signal, and a data driver for receiving the first and second-polarity data signals from the data modulator, and alternately outputting the first and second-polarity data signals at intervals of at least two successive periods, to supply the first and second-polarity data signals to the data line.