Optical ID sensing using illumination light sources positioned at a periphery of a display screen
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. An electronic device comprising:
a display screen comprising:
a cover glass;
a touch sensing layer disposed under the cover glass, the touch sensing layer having an edge surface; and
a display illumination layer disposed under the touch sensing layer;
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 adjacent the edge surface of the touch sensing layer, the light source configured to emit a light beam from a surface of the light source that faces the edge surface of the touch sensing layer, so that the light beam is coupled into the touch sensing layer through the edge surface and a portion of the light beam that is coupled into the touch sensing layer is transmitted through the cover glass to illuminate the hand for imaging of fingerprint pattern or the palmprint pattern by the optical ID sensing module.
2. The electronic device of claim 1 , wherein the display illumination layer comprises a plurality of organic light-emitting diodes (OLEDs).
3. The electronic device of claim 2 , wherein the display illumination layer further comprises a plurality of thin film transistors (TFTs) electrically coupled to the plurality of OLEDs for operating the plurality of OLEDs.
4. The electronic device of claim 1 , wherein the touch sensing layer comprises touch sensing circuitries.
5. The electronic device of claim 1 , wherein the light source comprises a light-emitting diode (LED), a laser diode (LD), or a vertical-cavity surface-emitting lasers (VCSEL).
6. The electronic device of claim 1 , 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.
7. The electronic device of claim 1 , wherein the display screen further comprises a dark coating applied to a back surface of the cover glass at a border of the display screen, and wherein the light source is disposed under the dark coating.
8. An electronic device comprising:
a display screen comprising:
a cover glass;
a touch sensing layer disposed under the cover glass, the touch sensing layer having an edge surface; and
an organic light-emitting diode (OLED) layer disposed under the touch sensing layer;
an optical identification (ID) sensing module disposed under the OLED 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 adjacent the edge surface of the touch sensing layer, the light source configured to emit a light beam from a surface of the light source that faces the edge surface of the touch sensing layer, so that the light beam is coupled into the touch sensing layer through the edge surface and a portion of the light beam that is coupled into the touch sensing layer is transmitted through the cover glass to illuminate the hand for imaging of fingerprint pattern or the palmprint pattern by the optical ID sensing module.
9. The electronic device of claim 8 , wherein the light source comprises a light-emitting diode (LED), a laser diode (LD), or a vertical-cavity surface-emitting lasers (VCSEL).
10. The electronic device of claim 8 , wherein the light source is configured to emit the light beam in a near infrared (NIR) wavelength range.
11. The electronic device of claim 10 , wherein the optical ID sensing module comprises an optical filter configured to transmit light in the NIR wavelength range, and block visible light.
12. The electronic device of claim 8 , wherein the light source is configured to emit the light beam in an ultraviolet (UV) wavelength range or a visible wavelength range.
13. The electronic device of claim 8 , further comprising a processor communicatively coupled to the optical ID sensing module, the display screen, and the light source, the processor configured to:
detect a trigger event for operating the optical ID sensing module; and
in response to detecting the trigger event:
turn off the OLED layer;
turn on the light source; and
cause the optical ID sensing module to capture the image of the fingerprint pattern or the palmprint pattern of the hand illuminated by the light beam emitted by the light source.
14. The electronic device of claim 8 , wherein the display screen further comprises a dark coating applied to a back surface of the cover glass at a border of the display screen, and wherein the light source is disposed under the dark coating.
15. The electronic device of claim 14 , wherein the light source is configured emit the light beam in a first wavelength range, and the dark coating is partially transparent to light in the first wavelength range.