Patent ID: 7462794

Claim:
A keypad assembly comprising: a keypad having a light guide panel, the interior of which light propagates through from one lateral surface of the light guide panel to another lateral surface of the light guide panel opposite to the one lateral surface, at least one key button disposed on the upper surface of the light guide panel, at least one reflective pattern locally formed on the light guide panel to reflect a part of the propagated light towards the key button, and at least one protrusion formed on the lower surface of the light guide panel; at least one light emitting device positioned to face the one lateral surface of the light guide panel and adapted to couple light to the interior of the light guide panel; and a switch board having at least one switch formed on its upper surface, which faces the keypad, wherein as the key button is pressed, a portion of the light guide panel deformed towards the switch board activates the switch.