Optical-based skin detection sensor, wearable device including optical-based skin detection sensor, and optical-based skin detection method using the same

A wearable device comprising;

• a skin detection sensor comprising:
• a first light emitting unit configured to output first output light of a first wavelength range;
• a second light emitting unit configured to output second output light of a second wavelength range different from the first wavelength range;
• a light receiving unit configured to sense first reflected light and second reflected light reflected, respectively, from a predetermined object in which the first output light and the second output light are detected within a predetermined distance;
• and
• a controller configured to determine whether the predetermined object is skin based on reflected light data for the first reflected light and the second reflected light sensed in the light receiving unit;
• and
• a processor configured to:
• determines that it is in a wearing state upon determining that the type of the predetermined object is skin, and
• controls activation of the wearable device based on the determined wearing state.

A method of detecting optical-based skin by at least one processor of a wearable device, the method comprising:

• outputting first output light of a first wavelength range based on a first light emitting unit;
• outputting second output light of a second wavelength range different from the first wavelength range based on a second light emitting unit;
• sensing first reflected light and second reflected light reflected, respectively, from a predetermined object in which the first output light and the second output light are detected within a predetermined distance based on a light receiving unit;
• determining whether the predetermined object is skin based on reflected light data for the sensed first reflected light and the second reflected light;
• determining that it is in a wearing state upon determining that the type of the predetermined object is skin;
• and
• controlling activation of the wearable device based on the determined wearing state.