If you are someone that wears polarised sunglasses and are interested in the Xperia Z2, then you should know that due to the polarisation of the display, the Xperia Z2 is not viewable in landscape mode. This means that if you wanted to take pictures, for example, you would need to remove your sunglasses.
All phones have this filter, but manufacturers normally ensure that the angle where the blackout occurs is not in the portrait or landscape planes. Typically manufacturers use a 45 degree polarisation angle to avoid such issues. Obviously this will only affect you if you wear polarised sunglasses. Polarised lenses contain a special filter that blocks this type of intense reflected light, reducing glare. The quick video below shows the issue in action on the Xperia Z2.