None of today's laptop screens are suitable for color-accurate work, they are comparable pieces of sh*t, but fortunately at least get better by time.
There is no such "coating" on glossy, modern glossy screens try to diffract incoming light into being swallowed by the screen instead of being reflected. That works alos like a water surface that depending on the angle either lets you see through (screen looks like a black hole when turned off) or reflects (screen looks like a mirror when turned off).
Unfortunately to reduce manufacturing costs it isn't done very well on most screens. You'd need thicker layers of different glass for that and the result also depends alot on the frequency/color and angle of the incoming light.
By the way, matte screens do
not reflect less light (in fact even slightly more) and are
less color accurate because the rough/uneven surface spreads/distorts colors more. You can easily see that when looking at large unicolored surfaces (like the gray/light blue areas of this forum). On matte screens they appear to have a twinkling and silky appeal that changes with viewing angle.
Some of the "professionals" on this forum also mention how graphic-professional monitors often come with large hoods to help against reflections from the sides and above. This argument has nothing to do with glossy at all. All screens reflect light including matte ones and because most of those screens are in fact matte those hoods are offered for matte screens mostly.

Besides, those hoods serve another function, namely to keep the eyes from adapting to enviromental lighting temperature and brightness.
The reason why "print" professionals prefer matte is that it resembles paper's "inaccuracies" like lack of contrast and color intensity more than glossy screens do. Video and Web professionals should really be prefering glossy screens, simply because of the fact that end-users nowadays use more glossy than matte (both as computer screens and as TV screens).
In a properly setup workplace for professional color acurate pre-press work you don't need to worry about most of these things aside from the more paper-like appeal of matte. These workplaces are setup with normed indirect lighting of correct color temperature and normed "gray" wall painting while using hardware calibrated monitors.
If I find time I may write a more detailed post about all this, because it's astounding how many "professional" people with no real idea about the technical aspects post their "oppinion" instead of knowledge.