Selective Charge Sharing in LCD Source Lines
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Solution Overview
Problem
LCD drivers using the dot inversion method experience significant power dissipation due to fluctuations in voltage levels of display data signals, which is not effectively addressed by existing charge sharing technologies.
Innovation Solution
A charge sharing method for LCD drivers that selectively connects source lines based on data changes, using Z-inversion and dynamically determining which groups of source lines to connect for charge sharing, thereby reducing power consumption while maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If dot inversion method is used to improve display quality, then display quality is improved, but power dissipation increases considerably
Solution Approach 1:
The source lines are segmented into multiple groups (first group and second group) based on their polarity characteristics. Odd-numbered source lines forming a first group and even-numbered source lines forming a second group are selectively connected to different charge sharing lines, allowing independent charge sharing for each group and reducing overall power dissipation while maintaining display quality
Solution Approach 2:
The charge sharing configuration is made dynamic by selectively connecting source lines to charge sharing lines based on real-time data changes. The determination unit dynamically decides which source lines should share charges based on the data received, optimizing power consumption for each frame rather than using a static charge sharing scheme
2Loss of energy
If charge sharing is performed among all source lines, then power dissipation is reduced, but display quality may deteriorate due to improper charge sharing timing
Solution Approach 1:
The determination unit receives data for multiple source lines and dynamically determines whether charge sharing should be performed based on the actual data changes. This feedback mechanism ensures that charge sharing is only activated when necessary, preventing display quality deterioration while still achieving power savings when beneficial
Solution Approach 2:
Different charge sharing strategies are applied to different groups of source lines based on their specific characteristics. The first group of source lines (odd-numbered) and second group (even-numbered) are treated differently, with each group having its own charge sharing line, allowing optimized charge sharing for each local group while maintaining overall display quality
Data Source
AI summary
A charge sharing method, device, and system is disclosed. For example, a charge sharing method for a display driver is disclosed. The method includes: receiving a first row of data for a first row of source lines; receiving a second row of data for a second row of source lines; for each source line of at least a first group of the source lines, determining whether a change amount between data for that source line from the first row of data and data for that source line from the second row of data is above a threshold; and performing selective charge sharing based on the determinations.