Source Driving Circuit for Liquid Crystal Panel Power Reduction
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Solution Overview
Problem
The existing liquid crystal display (LCD) driving methods, particularly the row inversion method, lead to increased power consumption in source drivers due to the need to switch between positive and negative driving voltages for sub-pixels, which affects the efficiency and brightness of the display.
Innovation Solution
The proposed liquid crystal panel and driving circuit configuration includes source driving circuits with multiple output ends connecting sub-pixels of the same polarity, allowing for the same polarity voltage to be applied across sub-pixels within a scanning frame, reducing the need for voltage switching and thus lowering power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the row inversion method is applied to the RGBW pixel structure with four sub-pixels, then the brightness and flicker performance are improved, but the source driver has to switch between positive and negative voltages which increases power consumption
Solution Approach 1:
The patent divides the pixel structure into four separate sub-pixels (R, G, B, W) instead of using a conventional three-sub-pixel structure. Each sub-pixel is independently controlled with its own data line, allowing for optimized voltage application to each sub-pixel type. This segmentation enables the source driver to apply voltages more efficiently by grouping sub-pixels with the same polarity requirements, thereby reducing the overall power consumption while maintaining brightness performance.
2Object-affected harmful factors
If the driving voltage polarity is inverted for each row to reduce flicker, then the display quality is improved, but the source driver experiences increased power consumption due to voltage switching
Solution Approach 1:
The patent implements a periodic voltage inversion scheme where the polarity of the driving voltage is inverted in a systematic pattern across rows and time periods. Specifically, adjacent rows have opposite polarities, and the inversion pattern repeats periodically. This periodic action maintains the flicker-reduction benefits of row inversion while allowing the source driver to predict and prepare voltage transitions, thereby optimizing power consumption compared to arbitrary or frequent polarity changes.
Data Source
AI summary
The present disclosure relates to a liquid crystal panel and the driving circuit. The liquid crystal panel includes a plurality of source driving circuits and a plurality of sub-pixel rows extending along a row direction. Each of the sub-pixel rows includes a plurality of sub-pixels of different colors and the sub-pixels are arranged periodically along the row direction. Within one scanning frame, polarity of driving voltage of at least one sub-pixel within the arranging period is opposite to that of other sub-pixels. Each of the source driving circuit includes at least two output ends respectively connecting to at least two sub-pixels having the same polarity of driving voltage within the same scanning frame to provide the driving voltage of the same polarity to the at least two sub-pixels. In this way, the power consumption of the source driving circuit may be reduced.