Source Driving Device With Segmented Code Mapping For Current Reduction

The patent applies local quality by assigning different code-to-code mapping relations to different source driving channels. Specifically, odd-numbered channels use one mapping relation while even-numbered channels use another, causing level shifters in different channels to switch at different times. This local differentiation in mapping relations distributes the switching events temporally, preventing simultaneous switching and the resulting large instantaneous currents, while each channel still maintains accurate signal transmission through its dedicated mapping relation.

The patent implements periodic action by systematically alternating the switching timing of level shifters across different source driving channels. By using different code-to-code mapping relations for odd and even channels, the patent creates a periodic distribution of switching events throughout the frame conversion process. This periodic staggering maintains the overall frame conversion speed while preventing concentration of switching currents at any single moment, thereby reducing temperature rises and improving chip reliability.

The patent applies segmentation by dividing the source driving channels into distinct groups (odd-numbered and even-numbered channels) and assigning different code-to-code mapping relations to each group. This segmentation approach prevents simultaneous switching of level shifters across all channels while avoiding the need for completely unique mapping relations in every channel. The segmented strategy effectively reduces instantaneous currents with minimal increase in system complexity compared to using identical mapping relations everywhere.