What feature characterizes a multi-touch mobile device display?

A multi-touch mobile device display is characterized by its ability to process multiple contact points for advanced gestures. This feature enables users to interact with the device in a more dynamic way. For instance, you can pinch to zoom, swipe with multiple fingers, or perform simultaneous actions, which adds a layer of functionality and user engagement. Multi-touch technology typically works by using capacitive sensing, which detects changes in the electric field when a finger comes in contact with the screen.

The other options do not accurately describe the defining feature of multi-touch displays. The second option suggests that the device only supports single-point touch interactions, which contradicts the very essence of multi-touch technology. The third option relates to display technology that may not necessarily involve touch capabilities, such as LCD screens that modify their appearance based on voltage rather than touch input. Lastly, the fourth option describes certain display types that do not generally pertain to touch functionality, such as emissive displays without requiring a backlight, but again, this does not directly relate to the multi-touch feature. Hence, the ability to recognize multiple contact points clearly differentiates multi-touch displays from other types of touch technologies.