Display Panel Polarity Inversion for Flicker and Power Reduction
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Solution Overview
Problem
In liquid crystal displays, existing polarity inversion methods such as frame inversion, column inversion, and dot inversion lead to flicker phenomena and high power consumption due to frequent polarity changes in data voltage signals.
Innovation Solution
A display panel with N columns of sub-pixels, each comprising a first and second pixel unit of opposite polarity, connected to separate data lines, where the polarity signals on these lines are alternated between frames to minimize simultaneous polarity changes across sub-pixels of the same color, reducing the need for frequent data line inversions and balancing loads on data lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If dot inversion is used to improve display quality and reduce flicker, then picture quality is improved, but data line polarity must be frequently inverted resulting in high power consumption
Solution Approach 1:
The invention divides the pixel array into multiple pixel units, each containing sub-pixels of different colors (e.g., red, green, blue sub-pixels in a 1xM arrangement). By segmenting the inversion operation to occur at the pixel unit level rather than individual sub-pixel level, the frequency of data line polarity inversions is reduced while still achieving flicker reduction. This segmentation allows adjacent pixel units to be driven with opposite polarities, eliminating the need for frequent data line polarity changes required by traditional dot inversion.
Solution Approach 2:
The invention transitions from traditional 1x1 pixel units to 1xM pixel units (where M≥2), adding a dimensional aspect to the pixel organization. This dimensional change enables multiple sub-pixels of different colors to be arranged in series within each pixel unit, allowing the inversion operation to affect multiple sub-pixels simultaneously through a single data line polarity change, thereby reducing the overall inversion frequency and power consumption.
2Reliability
If frame inversion or column inversion is used for polarity inversion, then liquid crystal polarization damage is prevented, but flicker phenomenon occurs during frame switching
Solution Approach 1:
The invention segments the pixel array into multiple pixel units within each pixel column, where each pixel unit contains sub-pixels of different colors arranged in series. By performing inversion at the pixel unit level rather than at the frame or column level, the invention enables more granular control over polarity distribution. This segmentation allows adjacent pixel units to have opposite polarities, creating a smoother transition that reduces flicker while still preventing liquid crystal polarization damage.
Solution Approach 2:
The invention applies different polarity assignments to different pixel units within the same column, creating local quality variations in the polarity distribution. Each pixel unit can be independently assigned a polarity opposite to its adjacent pixel units, allowing localized optimization of both flicker reduction and liquid crystal protection without requiring global frame or column inversion.
Data Source
AI summary
Provided are a display panel, a driving method thereof and a display device, for improving the quality of displayed images and reducing the power consumption. The display panel includes first and second pixel units of opposite polarities, and first and second data lines for transmitting signals of opposite polarities. The first and the second pixel units each includes at least two sub-pixels of different colors. The first data line is connected to the first pixel units in the (j−1)th and jth columns of sub-pixels. Sub-pixels in the first pixel unit in the (j−1)th column have different colors from those in the first pixel unit in the jth column. The second data line is connected to the second pixel units in the jth and (j+1)th columns. Sub-pixels in the second pixel unit in the jth column have different colors from those in the second pixel unit in the (j+1)th column.