Display Panel Data Line Polarity Segmentation for Power Reduction
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Solution Overview
Problem
Conventional display panels experience increased power consumption due to high voltage requirements for large-size and high-resolution displays, particularly in technologies like In-plane Switching (IPS) or Multi-domain Vertically Alignment (MVA), and existing polarity inversion methods do not effectively reduce power usage.
Innovation Solution
The display panel design involves interleaving adjacent even and odd data lines, ensuring most data lines are maintained on a single polarity, thereby reducing the swing voltage and power consumption, and improving the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarity inversion driving methods (Line Inversion, Dot Inversion, Column Inversion) are used to prevent liquid crystal polarization, then display quality is improved, but power consumption increases due to increased swing voltage requirements
Solution Approach 1:
The patent segments the data lines into two independent groups: even-numbered data lines (D0, D2, D4, ...) and odd-numbered data lines (D1, D3, D5, ...). Each group is driven independently with its own polarity sequence, allowing them to operate at half the swing voltage of conventional single-polarity inversion methods. This segmentation enables the even and odd data lines to be updated at different times, reducing the overall swing voltage requirements and power consumption while maintaining display quality.
2Ease of manufacture
If DC common voltage is used for large-size panels, then manufacturing simplicity is improved, but swing voltage on data lines increases to about two times the common voltage amount
Solution Approach 1:
The patent introduces dynamic polarity switching for different data line groups. Instead of using a static DC common voltage for all data lines, the system dynamically switches the polarity of even and odd data lines at different times. The even data lines are updated first with one polarity, then the odd data lines are updated with the opposite polarity. This dynamic approach allows the use of DC common voltage while reducing the effective swing voltage on individual data lines to half of what would be required with conventional single-polarity inversion.
3Power
If adjacent even and odd data lines are interleaved and updated at different times, then swing voltage is reduced to half, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent implements periodic polarity inversion with a specific sequence: even data lines are inverted first, then odd data lines are inverted in the next period. This periodic action creates a regular, predictable pattern that simplifies the control logic compared to more complex inversion schemes. The source driver follows a systematic sequence of updating even and odd data lines alternately, which reduces swing voltage to half while maintaining manageable device complexity through regular, repeating patterns.
Data Source
AI summary
A display panel is disclosed. The display units with the same position at odd rows and even rows are electrically coupled to different data lines, such that most of the time each of the data lines on the display panel is maintained on a single polarity, respectively. Accordingly, the swing voltage of the data lines on the display panel is reduced when scanning an image, such that the power consumption of the display panel is further reduced in order to achieve the object of saving power.