20120146917 | KEY INPUT APPARATUS CAPABLE OF DISPLAYING KEY INPUT USING LIGHT AND METHOD OF EMITTING THE LIGHT - A key input apparatus capable of displaying a key input using light and a method of emitting the light are provided. The key input apparatus includes: a display unit; a key input unit configured to output a key signal in response to pressing a particular key corresponding to the character or number among a plurality of the keys, and distinguish the particular key from the other keys using light; and a control unit configured to output information on the character or number to the display unit in response to the key signal, and control a period of time for which the particular key is distinguishable using light to be longer than a period of time for which the particular key has been pressed. | 06-14-2012 |