Patent ID: 6956561
Filing Date: 2005-10-18
Classification: H01H,H04M

Abstract:
1. A keypad backlighting apparatus comprising: an upper case having a plurality of button holes formed in a predetermined pattern; an electroluminescence (EL) keypad attached to the upper case and having buttons exposed through the button holes; a printed circuit board (PCB) adjacent the EL keypad and having a backlight driving circuit for supplying power to the EL keypad; and a lower case, coupled to the upper case, for supporting the EL keypad, wherein the PCB has a plurality of actuators arranged in a same pattern with the button of the EL keypad such that each actuator contacts a corresponding button, wherein the EL keypad comprises: a flexible EL pad having a plurality of raised domes protruding through the button holes of the upper case, button blocks formed of a predetermined material in lower cavities of the domes, each dome and button block pair defining one button of the EL keypad and wherein the button block contacts a corresponding actuator when depressed, a transparent film having a conductive pattern, a light emitting layer formed by coating light-emitting ink on a surface of the transparent film, a dielectric layer formed on the light emitting layer, and a first electrode installed on the dielectric layer.