Optical id sensing using illumination light sources positioned at a periphery of a display screen

Abstract

An electronic device includes a display screen, which includes a cover glass, a transparent layer disposed under the cover glass disposed under the cover glass, and a display illumination layer disposed under the transparent layer. The electronic device further includes an optical ID sensing module disposed under the display illumination layer and configured to form an image of a fingerprint pattern or a palmprint pattern of a hand of a user. The electronic device further includes a light source disposed at an edge side of the transparent layer, and is configured to emit a light beam to be coupled into the transparent layer through the edge side. A portion of the light beam may be transmitted through the cover glass to illuminate the hand for imaging of fingerprint pattern or the palmprint pattern by the optical ID sensing module.

1 .- 15 . (canceled) 
     
     
         16 . An electronic device comprising:
 a display screen comprising:
 a cover glass having a front surface and a back surface opposite to the front surface; and 
 a display illumination layer disposed under the cover glass; 
   an optical identification (ID) sensing module disposed under the display illumination layer, the optical ID sensing module configured to form an image of a fingerprint pattern or a palmprint pattern of a hand of a user placed within a field of view (FOV) of the optical ID sensing module; and   a light source disposed under the back surface of the cover glass, the light source configured to emit a light beam from an emitting surface that is substantially perpendicular to the back surface of the cover glass, a portion of the light beam being coupled into the cover glass through the back surface of the cover glass and being transmitted through the front surface of the cover glass to illuminate the hand for imaging of the fingerprint pattern or the palmprint pattern by the optical ID sensing module.   
     
     
         17 . The electronic device of  claim 16 , wherein the light beam emitted by the light source is incident on the back surface of the cover glass at a non-normal incidence angle. 
     
     
         18 . The electronic device of  claim 16 , further comprising:
 a light coupler disposed under the cover glass at a border region of the display screen;   wherein the light source is disposed under the cover glass and adjacent the light coupler, and the light beam emitted by the light source is coupled into the cover glass through the light coupler.   
     
     
         19 . The electronic device of  claim 18 , further comprising a first dark coating applied to a bottom surface of cover glass at the border region of the display screen, the first dark coating exposing the light coupler, wherein the light source is disposed under the first dark coating. 
     
     
         20 . The electronic device of  claim 19 , further comprising a second dark coating applied to a bottom surface of the light coupler. 
     
     
         21 . The electronic device of  claim 16 , wherein the cover glass has a slanted surface at an edge thereof, and wherein the light source is disposed under the cover glass adjacent the edge, the slanted surface configured to reflect the light beam emitted by the light source and coupled into the cover glass. 
     
     
         22 . The electronic device of  claim 21 , further comprising a high-reflection coating applied to the slanted surface of the cover glass. 
     
     
         23 . The electronic device of  claim 21 , wherein the slanted surface forms an angle with respect to a top surface of the cover glass, the angle ranging from about 100 degrees to about 175 degrees. 
     
     
         24 . The electronic device of  claim 21 , further comprising a dark coating applied to a bottom surface of the cover glass adjacent the edge, the dark coating exposing the light source. 
     
     
         25 . The electronic device of  claim 16 , wherein the light source is configured to emit the light beam in a near infrared (NIR) wavelength range, an ultraviolet (UV) wavelength range, or a visible wavelength range. 
     
     
         26 . The electronic device of  claim 16 , wherein the display illumination layer comprises a plurality of organic light-emitting diodes (OLEDs). 
     
     
         27 . The electronic device of  claim 16 , wherein the display screen further comprises a touch sensing layer disposed between the cover glass and the display illumination layer.