Image sensing with a waveguide display
First Claim
1. An imaging system comprising:
- a display configured as a waveguide, the display including a cover glass and a volume holographic grating configured to diffract incident light from an object positioned outside the display, the diffracted incident light having an angle of incidence relative to the volume holographic grating that satisfies the Bragg condition, the volume holographic grating diffracting the incident light through the waveguide at a predetermined angle.
1 Assignment
0 Petitions
Accused Products
Abstract
An electronic device includes an image sensing display. The display includes a cover glass and is configured as a waveguide. A volume holographic grating in the display diffracts incident light from an object positioned outside the display. The diffracted incident light has an angle of incidence relative to the volume holographic grating that satisfies the Bragg condition. The volume holographic grating diffracts the incident light through the waveguide at a predetermined angle and with a predetermined waveguide exit distance to focus at the image sensor. An image sensor is positioned at an output of the waveguide to capture the diffracted incident light propagated through the waveguide. Image processing circuitry is coupled to the image sensor to recognize a fingerprint image captured by the image sensor through the waveguide.
-
Citations
20 Claims
-
1. An imaging system comprising:
a display configured as a waveguide, the display including a cover glass and a volume holographic grating configured to diffract incident light from an object positioned outside the display, the diffracted incident light having an angle of incidence relative to the volume holographic grating that satisfies the Bragg condition, the volume holographic grating diffracting the incident light through the waveguide at a predetermined angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
10. A method comprising:
-
diffracting, via a volume holographic grating, incident light from an object positioned outside a display, the display being configured as a waveguide, the diffracted incident light having an angle of incidence relative to the volume holographic grating that satisfies the Bragg condition; and propagating the diffracted incident light through the waveguide at a predetermined angle. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. An electronic device comprising:
-
a cover glass; a display panel layer; a volume holographic grating configured to diffract incident light from an object positioned outside the display through a waveguide including the cover glass, the object being illuminated through the cover glass from the direction of the display panel layer, the diffracted incident light having an angle of incidence relative to the volume holographic grating that satisfies the Bragg condition, the volume holographic grating diffracting the incident light through the waveguide at a predetermined angle; and an image sensor positioned at an output of the waveguide to capture the diffracted incident light propagated through the waveguide. - View Dependent Claims (20)
-
Specification