Low profile keyboard backlight module

A low profile keyboard backlight module, comprising a bottom membrane layer, a top membrane layer and an intermediate membrane layer sandwiched between said bottom membrane layer and said top membrane layer, wherein:

• said bottom membrane layer is an electrically insulative layer;
• said intermediate membrane layer is laminated on a top surface of said bottom membrane layer, comprising a conducting layer, an insulative layer and a light-emitting layer attached together through lamination, wherein the conducting layer comprises a first conducting layer, a second conducting layer, a plurality of bottom electrodes integrally formed on the top surface of the bottom membrane layer and a plurality of second upper electrodes bonded to a bottom surface of the top membrane layer with the plurality of second upper electrodes respectively disposed corresponding to the respective plurality of bottom electrodes;
• said top membrane layer is an electrically insulative layer bonded to a top surface of said intermediate membrane layer opposite to said bottom membrane layer, comprising an elastic layer located at a top surface thereof and supporting a set of keys;
• wherein the first conducting layer and the plurality of bottom electrodes are made by a one-step processing process, the second conducting layer and the plurality of second upper electrodes are made by a one-step processing process;
• wherein when the plurality of second upper electrodes are forced, the plurality of second upper electrodes will touch the respective plurality of bottom electrodes.