Charge Sharing Switch Circuits for Zigzag Pixel Data Lines
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Solution Overview
Problem
Liquid crystal display devices with zigzag pixel arrangements and column inversion driving types face high power consumption due to frequent charging and discharging of data lines, making it difficult to implement charge sharing effectively, which limits power-saving capabilities.
Innovation Solution
Incorporating first and second charge sharing switch circuits that alternately couple pixels to data lines, allowing data lines with the same polarity to share charges while those with different polarities do not, thereby optimizing power usage during display operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If column inversion driving type is adopted with zigzag pixel arrangement, then display quality is improved, but power consumption increases due to frequent charging and discharging of data lines
Solution Approach 1:
The patent segments the data lines into multiple groups based on their polarity assignments. Data lines are divided such that lines with the same polarity are grouped together, enabling selective charge sharing within groups while maintaining the zigzag pixel arrangement and column inversion driving type. This segmentation allows the system to retain display quality while reducing power consumption through targeted charge sharing operations.
2Use of energy by moving object
If charge sharing operation is implemented, then power consumption is reduced, but it becomes unfeasible in zigzag pixel arrangement with column inversion driving type without causing much more power consumption
Solution Approach 1:
The patent introduces dynamic control mechanisms through switch circuits that selectively connect data lines based on their polarity assignments. The charge sharing operation is dynamically activated only when necessary, controlled by timing signals that coordinate with the column inversion driving type. This dynamic approach enables charge sharing to reduce power consumption while avoiding the complexity of implementing it continuously across all data lines in the zigzag arrangement.
3Use of energy by moving object
If data lines with respective positive and negative polarities are connected together to share charges, then about 50% dynamic power can be saved, but much more power consumption is caused in zigzag pixel arrangement with column inversion driving type
Solution Approach 1:
The patent applies local quality by differentiating the treatment of data lines based on their polarity assignments. Data lines are selectively grouped and charged shared only when they share the same polarity, while lines with different polarities are kept separate. This localized approach to charge sharing enables power savings in specific regions of the display without causing excessive power consumption across the entire system, thereby maintaining power consumption stability.
Data Source
AI summary
A display device includes multiple first data lines, multiple second data lines, multiple pixel columns, at least a first charge sharing switch circuit and at least a second charge sharing switch circuit. The second data lines are alternately arranged with the first data lines. Each of the pixel columns includes multiple first pixels and multiple second pixels. The first pixels of each of the pixel columns are coupled to one of the first data lines, and the second pixels of each of the pixel columns are coupled to one of the second data lines. The first charge sharing switch circuit each is electrically coupled to at least a part of the first data lines. The second charge sharing switch circuit each is electrically coupled to at least a part of the second data lines. A display device driving method and a source driving circuit also are provided.