So, uh, you think modern display technology is the reason for not having PS1 games on PS4, because... reasons? Unless Sony has actually claimed this to be a reason, I don't see any reason to consider it a plausible reason, and even if Sony has said claimed this to be a reason, I still don't consider it a plausible reason.
Also, I'll take the PS1 games on PS4 yesterday, thank you! I took PS1 on PS4 for granted after they were supported on PS3 and was sorely disappointed by Sony's incompetence with the issue. I have pretty much zero expectations at this point and even if Sony does manage to get PS1 games on PS4, it'll still be very late.