Integrated light emitting display, IR light source, and sensors for detecting biologic characteristics
A bio-sensor device, integrated with a display portion, includes a surface for touching by a body part, such as a finger. A light source, such as an array of LEDs, emit light through the surface so as to be reflected and partially absorbed by the body part An array of photodetectors detects light reflected back by the body part and generates signals corresponding to an image of the light reflection, which corresponds to the light absorption pattern in the body part. The light absorption pattern may correlate to a fingerprint, a blood vessel pattern, blood movement within the blood vessels, combinations thereof, or other biometric feature. A processor receives the signals from the photodetectors and analyzes the signals to determine a characteristic of the body part. The characteristic may be used to authenticate the user of the bio-sensor device by comparing the detected characteristic to a stored characteristic.
1. A bio-sensor device comprising:
a display portion having a light passing panel, the display portion emitting visible light from a two-dimensional array of pixels to generate an image, the pixels generating light having a first set of peak wavelengths;
an infrared light source optically coupled into an edge of the light passing panel, wherein the light passing panel acts as a light guide to guide the light from the infrared light source and emit the light from the infrared light source through a light emitting surface of the light passing panel;
a two-dimensional array of photodetectors arranged to detect light reflected back by a body part contacting the light passing panel, the photodetectors generating first signals corresponding to the light reflected back by the body part;
a controller coupled to the display portion and the infrared light source, the controller being configured to control pixels in the display portion to emit light within the first set of peak wavelengths while separately controlling the infrared light source; and
detection circuitry coupled to the photodetectors configured for analyzing the first signals corresponding to at least reflections of the infrared light from the body part.
2. The device of claim 1 wherein light from the infrared light source is extracted from the light passing panel at areas where the body part contacts the light passing panel over the display portion.
3. The device of claim 1 wherein the detection circuitry detects a fingerprint, where crests of the fingerprint contact the light passing panel and extract light from the light passing panel.
4. The device of claim 1 wherein the detection circuitry detects a blood vessel pattern in the finger.
5. The device of claim 1 wherein the detection circuitry detects a combined pattern of a fingerprint and blood vessels in the finger.
6. The device of claim 1 wherein light from the display portion is reflected off the body part to detect a fingerprint.
7. The device of claim 1 wherein the detection circuitry detects a combined pattern of a fingerprint and blood vessels in a finger.
8. The device of claim 1 wherein the display portion comprises blue, green, and red pixels.
9. The device of claim 1 wherein the photodetectors are distributed among the pixels in the display portion.
10. The device of claim 1 wherein the photodetectors are outside of the display portion.
11. The device of claim 1 wherein the photodetectors are laterally spaced from the pixels in the display portion.
12. The device of claim 1 wherein the infrared light source comprises one or more light emitting diodes.
13. The device of claim 1 wherein the photodetectors are located behind the light guide such that reflected light from the body part passes through the light guide for detection by the photodetectors.
14. The device of claim 1 further comprising a processor, the processor being configured to process data from the photodetectors, compare the data to stored data, and indicate authentication of a user of the device.
15. The device of claim 1 wherein the body part is a finger, the device further comprising a processor configured to detect a positional relationship between a finger print and blood vessels in the finger.
16. The device of claim 1 wherein the controller controls selected pixels in the display portion to emit selected wavelengths to determine different types of biological features of the body part.
17. The device of claim 16 wherein the controller controls the selected pixels in the display portion to detect a fingerprint and controls the infrared light source to detect a blood characteristic in a finger.