Exactly correct. If you wanted "authentic" warping you could install a unity lens with warping around the edges on the face of the OLED. I built a simple hexago

Exactly correct. If you wanted "authentic" warping you could install a unity lens with warping around the edges on the face of the OLED. I built a simple hexagonal phosphor simulator module in HDL that one could use in an FPGA to reproduce the characteristics of any tube[1]. It has been suggested that I build a "retro" terminal kit out of it (but with selectable phosphor colors :-). [1] My thought was that you could "restore" old test equipment for which tubes were no longer available without changing the interface the electronics in the gear expected.