You really can't since the standard display resolution of the NES is only 256 pixels horizontal by 240 pixels vertical and it doesn't use a standard computer RBG color palette, but NTSC 54 colors (six of them gray levels). It is less noticeable on a very small LED, like 32 inch or less. It looks pretty bad on the big ones.
The Super NES has a little better resolution and 32768 colors:
Progressive: 256x224, 512x224, 256x239, 512x239
Interlaced: 512x448, 512x478