Opera DVD players

A Bluray player will also play a DVD. I have never experienced problems playing a DVD on a Bluray player into a HD screen. One other thing to be aware of: if you have an older tv it may not have an hdmi connection for the video part but only scart. Modern disc players only have hdmi video connections, and not scart.

Thanks willemj . Nearly all my DVD's are not Bluray, do you think the up /down  scaling (whatever it is) would cause a problem ? I know it can with a TV .

These days, a new disc player would be either a Bluray Player (there are some great Bluray opera discs) or even UHD Bluray. I would suggest an Oppo 203. It has both (very good) analogue and digital outputs. And it has superb UHD video quality. It can play files from a NAS as well. Apparently it is also Roon ready and can be used as a *very* basic pre amplifier (the 205 has a bit more potential for that).
If you already have a good DAC and don't care for UHD Bluray, a basic Bluray player will be fine as well, as long as it has an optical/coaxial digital stereo output to connect it to your DAC.