ExtremeTech has written a guide to help you get the best image quality possible on your LCD display, you can read it over here.
Still, I see people use LCD displays as if they were CRTs: pull them out of the box, connect them to the PC (usually via VGA), and run them at some non-native resolution. On top of that, the LCD makers exacerbate the situation. I recently unpacked an LCD display with DVI and HDMI inputs. But a VGA cable was pre-connected, implying that it was the cable that should be used. With that annoying thought in mind, let's dive into our LCD image quality tips.