Mobile terminal having an input device

摘要

An input device and a mobile terminal having the input device are provided. The input device includes a key button with a transparent material having an internal space, an illumination sensor located in an internal space of the key button to sense ambient illumination of the key button, a light-emitting portion located at one side of the illumination sensor to output a light signal to the outside of the key button for detecting a touch applied to the key button, and an input signal generation unit configured to generate a touch input signal according to the light signal being input to a light-receiving portion of the illumination sensor.