Liquid Crystal Display Data Line Polarity Control
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Solution Overview
Problem
Liquid crystal display devices face challenges in optimizing the polarity of data voltages supplied to data lines, leading to visible lines and luminance differences, which affect image quality and user discrimination between driving modes.
Innovation Solution
A liquid crystal display device and driving method that alternate the polarity of data voltages between positive and negative for different data lines in a cyclical pattern, determined by a mode control signal, to minimize visible lines and maintain consistent luminance across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the polarity of data voltage is fixed for all data lines, then the device complexity is reduced, but visible lines and luminance differences occur affecting image quality
Solution Approach 1:
The patent applies periodic action by alternating the polarity of data voltages between positive and negative in a cyclic manner across different data lines. Specifically, in the first frame, data lines D1-D3 receive positive polarity voltages while D4-D6 receive negative polarity voltages, then this pattern inverts in subsequent frames. This periodic polarity switching eliminates visible lines and luminance differences by dynamically adjusting voltage polarities to compensate for fixed pattern artifacts.
2Object-affected harmful factors
If different polarity patterns are applied to different data lines, then visible lines are reduced, but the complexity of voltage control increases
Solution Approach 1:
The patent applies segmentation by dividing data lines into distinct groups based on their polarity assignments. In the first frame, data lines are segmented into two groups: D1-D3 assigned positive polarity and D4-D6 assigned negative polarity. This segmentation allows independent polarity control for different data line groups, enabling effective visible line reduction while maintaining manageable control complexity through systematic group-based assignment.
3Stability of the object's composition
If polarity inversion is applied across all data lines, then luminance consistency is improved, but image quality degradation may occur due to gray level variations
Solution Approach 1:
The patent applies local quality by differentiating polarity assignments based on specific data line characteristics and positions. Rather than uniformly inverting polarity across all data lines, the system assigns positive polarity to D1-D3 and negative polarity to D4-D6 in the first frame, then inverts this pattern. This localized, differentiated approach maintains luminance consistency while accounting for gray level variations across different data lines, preventing image quality degradation.
Data Source
AI summary
A liquid crystal display device, including: pixels; data lines and scan lines coupled to the pixels; and a driver configured to supply a scan signal to the scan lines, and supply a data voltage to the data lines. The data lines include first to third data lines, to which a data voltage having a positive polarity is supplied, and which are adjacent to each other, and fourth to sixth data lines, to which a data voltage having a negative polarity is supplied, and which are adjacent to each other.