Not necessarily (read the "Glossy screens" section) (more examples).The other option is glossy, but that's horrible
(...and as you probably know, matte screens without special coating do also impair display quality, because they diffuse light, and that, at least in my experience, is particularily bad for readability of physically small text.)
It usually means that there are tiny little red, green, and blue dots everywhere on the screen. Visit http://www.tftcentral.co.uk/articles/panel_coating.htm and scroll down to "Panel Manufacturer Trends". The "AG" images show closeups of different types of matte screens.[...] I don't understand what means "grainy", the back light didn't spread evenly?