Illuminated keyboard structures

An input mechanism, comprising:

• an input surface operative to receive an input;
• a domed structure operative to collapse in response to the input;
• a switch housing overmolded over at least part of the domed structure, at least a portion of the switch housing being transparent, the input surface being movable relative to the switch housing;
• a transparent substrate positioned under the switch housing;
• electrical traces on the transparent substrate, the electrical traces operative to transmit a signal generated by the domed structure;
• and
• a light emitting element optically coupled to the transparent substrate;
• wherein
• the transparent substrate redirects light from the light emitting element to the input surface.

An input structure for an electronic device, comprising:

• a light emitting element;
• a backlight integrated membrane comprising a layer at least partially surrounding the light emitting element;
• terminals on the backlight integrated membrane;
• a housing structure on the backlight integrated membrane;
• a domed structure positioned on the backlight integrated membrane at least partially within the housing structure and about the terminals;
• and
• a key cap positioned above the domed structure and having an illuminable portion, wherein:
• the layer defines a light guide that directs light through the domed structure and toward the illuminable portion of the key cap;
• and
• a vent extending through the layer and positioned below the domed structure.