Wearable device

A device comprising:

• an optical signal transmitter configured to transmit optical signals including a first optical signal having a first wavelength and a second optical signal having a second wavelength;
• an optical signal sensor configured to receive reflected optical signals generated upon reflection of the optical signals by blood vessels of an object, wherein the reflected optical signals include:
• a first reflected optical signal caused by the first optical signal, and
• a second reflected optical signal caused by the second optical signal;
• one or more processors configured to:
• process the received reflected optical signals and generate pattern information regarding the blood vessels of the object based on the first reflected optical signal and the second reflected optical signal;
• determine a user's key input motion based on data acquired by processing the reflected optical signals,
• determine 3D positions of a first joint and a second joint of the object, wherein the first joint represents a connection between a palm and a first phalange of a finger and the second joint represents a connection between the first phalange and a second phalange of the finger, and
• generate an input value based on the 3D positions of the first joint and the second joint, wherein the input value matches the key input motion.

A wearable device comprising:

• an optical signal transmitter configured to transmit optical signals;
• an optical signal sensor configured to receive reflected optical signals generated upon reflection of the optical signals by blood vessels of an object;
• one or more processors unit configured to:
• process the received reflected optical signals;
• and
• calculate the distance and angle of the wearable device with the object based on data acquired by processing the reflected optical signals;
• and
• an image display configured to output an image to the outside, wherein:
• the optical signal transmitter transmits a first optical signal and a second optical signal having different first and second wavelengths;
• the optical signal sensor receives a first reflected optical signal caused by the first optical signal and a second reflected optical signal caused by the second optical signal;
• the one or more, processors are configured to:
• generates pattern information regarding the blood vessels of the object based on the first reflected optical signal and the second reflected optical signal;
• and
• calculate the distance and angle of the wearable device with the object by comparing the pattern information with pre-stored blood vessel information;
• and
• the image display outputs the image of a fixed size to a fixed position based on the distance and angle.