DLSS 2.0 requires motion vectors as an input to re-project the previous frame, so an equivalent of that at least can't be implemented in the display.

DLSS is also a rather heavy computation, taking 1-2 ms per frame on high end GPUs. That's a serious amount of processing power to put into a display and doing so makes it exclusive for that use. On the GPU those tensor cores can be used for other tasks when they're not doing DLSS.

You need to add Nvidias supercomputer to the screen too then.