System and method for driving electrowetting display device

A method of driving a group of sub-pixels of a display device, the method comprising:

• determining that a first sub-pixel of the group of sub-pixels is currently in an open state;
• determining a first target reflectance value for the first sub-pixel;
• determining that the first target reflectance value is greater than a first threshold value and less than a second threshold value;
• determining that the first target reflectance value is closer to the second threshold value than the first threshold value;
• setting a first reflectance of the first sub-pixel to the second threshold value in response to determining that the first target reflectance value is closer to the second threshold value than the first threshold value;
• calculating a first difference between the second threshold value and the first target reflectance value;
• and
• decreasing a second target reflectance value of a second sub-pixel in the group of sub-pixels by an amount related to the first difference.

A display device comprising:

• a group of sub-pixels comprising a first sub-pixel;
• and
• a display controller comprising:
• an input line for receiving data relating to a target reflectance of the group of sub-pixels;
• and
• a plurality of output lines coupled to the group of sub-pixel to control reflectance values of the group of sub-pixels;
• wherein the display controller is configured to:
• determine that the first sub-pixel of the group of sub-pixels is currently in an open state;
• receive, via the input line, a first target reflectance value for the first subpixel;
• determine that the first target reflectance value is closer to a second threshold value than a first threshold value;
• control the first sub-pixel via one of the plurality of output lines to set the first reflectance of the first sub-pixel to the second threshold value in response to determining that the first target reflectance value is closer to the second threshold value than the first threshold value;
• calculate a first difference between the second threshold value and the first target reflectance value;
• and
• decrease a second target reflectance value of a second sub-pixel in the group of sub-pixels by an amount corresponding to the first difference.