The Samsung S90C uses a unique subpixel structure. Instead of having all three subpixels in a row, each pixel forms a triangle, with the larger green subpixel at the top. This leads to color fringing, which is noticeable when displaying any content with horizontal lines, and it’s especially bad when the TV is used as a PC monitor. For example, on a bright window on a Windows PC, you might notice a green fringe at the top since that is where the green subpixel is.
Similarly, you can instead notice a purple fringe at the bottom of bright windows, as that is where the red and blue subpixels are. Furthermore, with this subpixel arrangement, text has just okay clarity on a PC, as Windows ClearType settings aren’t designed for this subpixel structure and can’t correct it.