Comment by Dwedit

With the gap, it's effectively three pixels wide. Basically a 3x5 font with one pixel chopped off.

On some displays, you can also divide RGB into three subpixels (R, G, and B stripes). A 3x5 pixel font (9x5 subpixels) can be drawn as a 6x5 subpixel font instead (a 2x5 pixel font).