IF your display is non-custom, you could find a replacement for it by opening your 01 and looking at the reference. Now I am looking for a replacement for my T3's display, and it seems I'll be able to find it here in Spain. It might cost 60% of what Korg charges me for a replacement.
I do not know if the 01 has a custom or non-custom display. As far as I know, the M1, T3, X5, Trinity have non custom display (purely graphical or alphanumeric). The X3, N346 have custom displays. I think the 01 has a large graphical display, but I wouldn't swear it.
If yours is a custom display, I think you could only call Korg and order a display.
(if you want this in Spanish just email to me)
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you can e-mail me at: robertico at europe dot com.