So why have monitor manufacturers such as Apple, Samsung and HP decided to bring glossy screens to the desktop computer? If reflections and brightly lit rooms can cause such a problem for glossy screen surfaces but not matte surfaces, why on earth would you go for glossy? As is often the case, the answer lies with science and specifically, the way in which light behaves when it strikes both glossy and matte screens.
A matte screen (anti-glare or AG) is effective at busting glare and eliminating reflection because it scatters (or diffuses) the light that strikes it. But it isn’t just the light striking the outside of the screen that behaves in this way – it’s the light the monitor produces, too. So instead of the image passing straight through like light shining through glass, it too is diffused and scattered as demonstrated by this little diagram:
A glossy screen, on the other hand, reflects much of the light striking the outside of the screen back directly, a bit like a mirror. Some of this reflection can be reduced by special chemical anti-reflective (AR) coatings which can absorb some of this light, but so far, there has been no way to eliminate it. This time, the light produced by the monitor isn’t diffused and passes through quite directly as shown below:
Essentially the image displayed by the glossy monitor will have more intense and vibrant colours and will be clearer than its matte counterpart (all else being equal).
There is also a value associated with matte surfaces called the ‘haze value’ which indicates how strongly it will diffuse light – the higher the haze value, the more the light hitting the monitor and the light produced by the monitor will be scattered . If you use a low haze value, then the glare reduction won’t be quite as great but the image will remain relatively clear and a bit more ‘punchy’. By using a high haze value, which monitors such as the Dell UltraSharp series are currently famed for, you will reduce the punchiness and the clarity of the image but will have very effective glare reduction.
For monitors in the latter category, people often comment on a ‘dirty’ or ‘grainy’ appearance on whites and other light colours. Some people are actually so sensitive to this that they notice the effect even on screens with a more moderate haze value. As with the reflections you get with glossy, everyone has their own sensitivity or ‘threshold of annoyance’, if you prefer. So next time you curse at your glossy screen or stare lovingly at your matte computer monitor, just remember that there are two sides to every coin.
About the author
This is a guest post by Adam Simmons, who is an expert in the field of display technology and shares his expertise on pcmonitors.org.