According to the present disclosure, an electronic device may include a housing forming a first portion of an outer surface of the electronic device and a display received in the housing and forming a second portion of the outer surface. The display may include a biometric sensor formed between a first pixel and a second pixel and a waveguide substantially perpendicular to the biometric sensor and extending from the biometric sensor to the second portion. In an electronic device, light or ultrasonic waves may be put to use in sensing the user's biometric information (e.g., fingerprint information) using a biometric sensor positioned in a portion of the display, presenting better performance.