US Patent 10236142 Luminous keyboard

A luminous keyboard includes a key structure, a supporting plate, a switch circuit board, a light guide plate, a top-view light-emitting element and a reflecting element. The supporting plate includes a supporting plate opening. The supporting plate is located under the key structure. The switch circuit board is located over the supporting plate. The light guide plate is located under the supporting plate, and includes a light guide plate opening. The top-view light-emitting element is inserted into the light guide plate opening. The reflecting element is arranged between the top-view light-emitting element and the key structure. After the light beam is transmitted through the supporting plate opening, the light beam is transmitted through the switch circuit board and reflected to the light guide plate by the reflecting element. Then, the light beam is guided to a periphery region of the key structure by the light guide plate.