An information detection and display apparatus, and detecting method and displaying method thereof are provided. The information detection and display apparatus includes: an optical sensor; a protective layer disposed on the optical sensor; and a display screen disposed underneath the optical sensor, wherein the display screen serves as a light source when the optical sensor is used for detecting optical information. The information detection and display apparatus can be used for generating optical fingerprint image, detecting finger touching, and displaying information. Thus, the information detection and display apparatus has multiple functions and applications.