Most smartphone makers prefer to ship their phones with LCD screens at its more cost-effective.
However AMOLED screens are more vulnerable to screen burn-in than their LCD counterparts.
While most smartphone manufacturers display resolution in their devices, not many advertise whether they are AMOLED or LCD.
With Apple also joining the LCD vs. AMOLED race with its next iPhone 7 featuring an AMOLED screen.
Therefore, an all-black image displayed on an AMOLED screen shouldnt release any light at all.
To try this method, start by downloading the all-black AMOLED test image above.
Next, turn your smartphones brightness all the way up, and take the gadget into a dark room.
If you see any light releasing from the smartphoneany light at allyour gadget has an LCD screen.
In the smartphone spec page, check for the keywords AMOLED or LCD under the Display category.
source: www.techworm.net
