In practice no digital TV actually works like this. The screen isn't instantly updated the moment the pixel data arrives on the line (which is exactly how analog CRTs work, which is why you have to adjust vertical hold, etc.)
You can still get lag on CRTs — phosphors don't light up instantly — but digital TV adds all kinds of opportunities for screwing up timing, and ironically it's the fancier TVs that do more processing (e.g. Interpolating frames, decoding 3D, et .).
You can still get lag on CRTs — phosphors don't light up instantly — but digital TV adds all kinds of opportunities for screwing up timing, and ironically it's the fancier TVs that do more processing (e.g. Interpolating frames, decoding 3D, et .).