Which type of mobile device display detects changes in an electrostatic field and supports single touch?

A capacitive display detects changes in an electrostatic field because it uses the electrical properties of the human body to sense touch. When a finger approaches the screen, it alters the electrostatic field at that location. This change is then registered by the display's sensors, allowing it to recognize the touch. Capacitive screens are renowned for their responsiveness and clarity, making them common in modern smartphones and tablets.

In the context of single-touch support, capacitive screens can indeed function with single points of contact. However, they are also capable of multi-touch detection, which allows for more complex gestures, but in this instance, the question emphasizes the capability to support single touch specifically.

The other options pertain to different technologies or functions. For example, multi-touch refers to the ability to detect multiple touch points simultaneously, which while often enabled by capacitive displays, is not what the question is asking. LCD (Liquid Crystal Display) and OLED (Organic Light Emitting Diode) refer to types of display technologies that describe how images are produced on the screen but do not inherently define the touch interface capabilities.