Array Substrate Common Electrode Polarity for Dot Reversal Power Reduction
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Solution Overview
Problem
The existing dot reversal driving mode in liquid crystal displays results in high power consumption due to large voltage swings between positive and negative polarity gray scales during the switching process.
Innovation Solution
An array substrate with pixel units arranged in a matrix form, featuring crisscrossed gate lines and data lines, where common electrodes with equal sums of rows and columns share the same voltage polarity, and adjacent units have reverse polarities, reducing the voltage swing of the data line driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dot reversal driving mode is adopted to improve display quality, then display picture quality is improved, but power consumption increases due to large voltage swing
Solution Approach 1:
The invention divides the pixel array into multiple regions with different polarity patterns (e.g., 2x2 blocks or stripe patterns). By segmenting the display into regions that share common electrode connections, the voltage swing requirement is reduced while maintaining dot reversal benefits within each segment. This allows adjacent pixels in the same segment to share common electrodes with the same polarity, reducing the overall voltage swing needed for dot reversal driving.
Solution Approach 2:
The invention applies different polarity configurations to different regions of the pixel array. Within each segmented region, pixels follow a local dot reversal pattern, while adjacent regions may have inverted polarity patterns. This local quality approach allows the system to maintain dot reversal benefits locally while reducing global voltage swing requirements through regional polarity optimization.
2Reliability
If voltage polarity is reversed frequently to prevent liquid crystal polarization damage, then liquid crystal material durability is improved, but power consumption increases due to voltage swing
Solution Approach 1:
The invention merges adjacent pixels into larger segments (e.g., 2x2 blocks) that share common electrode connections. By combining multiple pixels into segments with shared common electrodes, the system reduces the number of independent voltage reversal operations needed. This merging allows frequent polarity reversal for liquid crystal protection while reducing the cumulative power consumption through fewer switching events.
Solution Approach 2:
The invention implements a periodic polarity reversal scheme at the segment level rather than at the individual pixel level. By applying polarity reversal periodically to entire segments or regions rather than to each pixel individually, the system maintains liquid crystal material durability through regular polarity changes while significantly reducing the frequency of voltage switching events and associated power consumption.
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 effectively reduces power consumption while maintaining the dot reversal driving mode by minimizing the voltage swing between positive and negative polarity gray scales, thereby enhancing the efficiency of the display apparatus.
Implementation Method 1
rotation angles of liquid crystal molecules in the liquid crystal layer can be changed by changing a potential difference at two ends of the liquid crystal layer, such that light transmittance of the liquid crystal has a change
Data Source
AI summary
An array substrate (40), a driving method thereof and a display apparatus, relate to a field of display technique. The array substrate (40) comprises a plurality of pixel units (33) arranged in a matrix form and divided by a plurality of crisscrossed gate lines (31) and data lines (32), each of the pixel units (33) comprises pixel electrodes (331) and further comprises common electrodes (332); in the matrix of the pixel units (33), voltage polarities of the common electrodes (332) corresponding to pixel units (33) with a sum of numbers of rows and columns being equal are the same; voltage polarities of the common electrodes (332) of adjacent pixel units (33) are reverse. By adopting the array substrate of such a structure, the voltage swing of the data line (32) driving voltage between the positive and negative polarity gray scale is greatly reduced while the dot reversal driving is realized, thereby effectively reducing the power consumption of the array substrate (40) in the dot reversal driving mode.