Multi-primary display mask-based dithering with low blooming sensitivity

A color electrophoretic display comprising:

• a display panel including an active matrix of display pixels coupled to a color electrophoretic medium, each display pixel being capable of displaying at least three primary colors;
• device memory comprising stored color image data;
• and
• a master controller coupled to the display panel and the device memory, and configured to provide color instructions to each display pixel by executing the following steps:
• receiving color image data for each display pixel from the device memory;
• defining a separation cumulate for each display pixel by converting the color image data with a look up table;
• defining a separation cumulate threshold array corresponding to the color image data, wherein each portion of the separation cumulate threshold array includes at least two display pixels and a separation cumulate threshold for each of the at least three primary colors for that portion;
• and
• sending instructions to each display pixel to display the one of the at least three primary colors of the separation cumulate for which the separation cumulate of that display pixel exceeds the separation cumulate threshold for the portion of separation cumulate threshold covering that display pixel.