Luminous membrane keyboard with light-guiding spacer

A luminous membrane keyboard with a light-guiding spacer, comprising:

• a key comprising a protrusion;
• a first layer comprising a first circuit film and a first electrode layer, the first electrode layer being attached to the first circuit film;
• a second layer comprising a second circuit film and a second electrode layer, the second electrode layer being attached to the second circuit film;
• a light-guiding spacer comprising at least one opening, the light-guiding spacer being interposed between the first layer and the second layer, wherein the light-guiding spacer, the first layer, and the second layer are stacked on each other, the key is disposed outside one of the first layer and the second layer, and the protrusion is arranged corresponding to the at least one opening;
• and
• at least one insulating pad, the at least one insulating pad being disposed between the first circuit film and the first electrode layer, wherein the first layer forms a first raised portion within the opening via the disposition of the insulating pad, and the first raised portion and the second layer are spaced apart from and opposite to each other within the opening.