Repairing readers (if it means new display) is usually not worth the monies. The display is the most expensive, and hardest to reach part in a reader. So it's expensive for parts AND the work time it takes to actually perform the replacement itself once you got the parts.
For Kobo's stock software I can't help you, but KOReader is open source so it could probably be done, and you'd have to ask KOReader devs for a pointer.
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