An electronic device with touch sensing and fingerprint sensing capabilities, comprising: a touch screen that provides touch sensing operations, the touch screen includes display pixels that produce light for displaying images, wherein the touch screen includes a specified display zone, one or more display pixels in the specified display zone produce light for illuminating a user's finger in touch with a top transparent layer to produce the returned light; the top transparent layer is formed over the touch screen as an interface for being touched by a user for the touch sensing operations; and an optical sensor module located below the touch screen to receive light that is returned from the top transparent layer and transmitted through the touch screen, the optical sensor module including a fingerprint sensor zone that overlaps or partially overlaps the illumination zone, the optical sensor module including an optical detector array of photodetectors in the fingerprint sensor zone positioned to receive at least a portion of the returned light to detect a fingerprint; characterized in that: the touch screen includes a fingerprint sensing zone for a user to touch for fingerprint sensing to generate the returned light received by the optical detector array for detecting a fingerprint; a first optical sensing zone and a second optical sensing zone; the optical module includes a first additional optical detector located on a first side of the optical detector array to receive a portion of the returned light from the first optical sensing zone, and a second additional optical detector located on a second opposite side of the optical detector array to receive a portion of the returned light from the second optical sensing zone, wherein a pulsation delay time between the first and second additional optical detectors produces detector signals indicating whether the returned light is reflected from a finger of a live person. a touch screen that provides touch sensing operations, the touch screen includes display pixels that produce light for displaying images, wherein the touch screen includes a specified display zone, one or more display pixels in the specified display zone produce light for illuminating a user's finger in touch with a top transparent layer to produce the returned light; the top transparent layer is formed over the touch screen as an interface for being touched by a user for the touch sensing operations; and an optical sensor module located below the touch screen to receive light that is returned from the top transparent layer and transmitted through the touch screen, the optical sensor module including a fingerprint sensor zone that overlaps or partially overlaps the illumination zone, the optical sensor module including an optical detector array of photodetectors in the fingerprint sensor zone positioned to receive at least a portion of the returned light to detect a fingerprint; characterized in that: the touch screen includes a fingerprint sensing zone for a user to touch for fingerprint sensing to generate the returned light received by the optical detector array for detecting a fingerprint; a first optical sensing zone and a second optical sensing zone; the optical module includes a first additional optical detector located on a first side of the optical detector array to receive a portion of the returned light from the first optical sensing zone, and a second additional optical detector located on a second opposite side of the optical detector array to receive a portion of the returned light from the second optical sensing zone, wherein a pulsation delay time between the first and second additional optical detectors produces detector signals indicating whether the returned light is reflected from a finger of a live person. the touch screen includes a fingerprint sensing zone for a user to touch for fingerprint sensing to generate the returned light received by the optical detector array for detecting a fingerprint; a first optical sensing zone and a second optical sensing zone; the optical module includes a first additional optical detector located on a first side of the optical detector array to receive a portion of the returned light from the first optical sensing zone, and a second additional optical detector located on a second opposite side of the optical detector array to receive a portion of the returned light from the second optical sensing zone, wherein a pulsation delay time between the first and second additional optical detectors produces detector signals indicating whether the returned light is reflected from a finger of a live person.