Apparatus and method for detecting biometric information

A radial artery tracking method comprising:

• sequentially driving a plurality of light-emitting elements and radiating light from the plurality of light-emitting elements to an object;
• detecting optical signals through a light-receiving element according to the sequential driving of the plurality of light-emitting elements;
• determining, by a processor, at least two highest level signals among the detected optical signals;
• and
• determining, by the processor, a line connecting positions of at least two of the plurality of light-emitting elements corresponding to the determined at least two highest level signals as a tracking line.

A method of detecting biometric information of an object, the method comprising:

• sequentially driving a plurality of light-emitting elements and radiating light from the plurality of light-emitting elements to the object;
• detecting optical signals through a light-receiving element according to the sequential driving of the plurality of light-emitting elements;
• measuring a time delay between two or more highest level signals among the detected signals;
• and
• analyzing biometric information based on the measured time delay.

A biometric signal measurer comprising:

• a plurality of light emitting elements configured to sequentially turn on and off and radiate light to a target area on a skin of a subject to deflect the radiated light from the target area;
• and
• at least one optical sensor configured to detect the deflected light and disposed at a center position of a perimeter formed by connecting the plurality of light emitting elements;
• wherein while one of the plurality of light emitting elements is turned on, remaining ones of the plurality of light stay turned off.