A mobile computing device comprising: an active matrix organic light emitting diode (AMOLED) display (1200, 1300, 1500, 1600); and a camera having a sensor located beneath the AMOLED display, such that light received by the sensor passes through a transmit/receive region of a light-emitting area of the AMOLED display, wherein the transmit/receive region has a pixel density that is lower than other regions of the light-emitting area and that includes circuit elements arranged such that they diffract visible light that passes through the transmit/receive region, wherein the AMOLED display includes: a first light-blocking layer (1222, 1322, 1522, 1665) that includes a first pattern of opaque portions that are positioned above, and aligned with, the circuit elements to prevent light transmitted into the transmit/receive region from reaching the circuit elements; and a second light-blocking layer (1260, 1360, 1560, 1660) between the first light blocking layer and the camera and that includes a second pattern of opaque portions that is aligned with the first pattern, such that at least a portion of light transmitted into the transmit/receive region and diffracted by the first pattern of opaque portions is blocked by the second pattern of opaque portions from reaching the sensor of the camera, wherein an aperture of the first light-blocking layer defines an opening (1211, 1311, 1511, 1611) having a central axis which is parallel to a propagation direction of the light, and wherein an inside edge, being the closest edge to the central axis, of the second light-blocking layer is located below the first light-blocking layer and farther away from the central axis than a line parallel to the central axis and extending from an inside edge of the first light-blocking layer that defines the opening. an active matrix organic light emitting diode (AMOLED) display (1200, 1300, 1500, 1600); and a camera having a sensor located beneath the AMOLED display, such that light received by the sensor passes through a transmit/receive region of a light-emitting area of the AMOLED display, wherein the transmit/receive region has a pixel density that is lower than other regions of the light-emitting area and that includes circuit elements arranged such that they diffract visible light that passes through the transmit/receive region, wherein the AMOLED display includes: a first light-blocking layer (1222, 1322, 1522, 1665) that includes a first pattern of opaque portions that are positioned above, and aligned with, the circuit elements to prevent light transmitted into the transmit/receive region from reaching the circuit elements; and a second light-blocking layer (1260, 1360, 1560, 1660) between the first light blocking layer and the camera and that includes a second pattern of opaque portions that is aligned with the first pattern, such that at least a portion of light transmitted into the transmit/receive region and diffracted by the first pattern of opaque portions is blocked by the second pattern of opaque portions from reaching the sensor of the camera, wherein an aperture of the first light-blocking layer defines an opening (1211, 1311, 1511, 1611) having a central axis which is parallel to a propagation direction of the light, and wherein an inside edge, being the closest edge to the central axis, of the second light-blocking layer is located below the first light-blocking layer and farther away from the central axis than a line parallel to the central axis and extending from an inside edge of the first light-blocking layer that defines the opening. a first light-blocking layer (1222, 1322, 1522, 1665) that includes a first pattern of opaque portions that are positioned above, and aligned with, the circuit elements to prevent light transmitted into the transmit/receive region from reaching the circuit elements; and a second light-blocking layer (1260, 1360, 1560, 1660) between the first light blocking layer and the camera and that includes a second pattern of opaque portions that is aligned with the first pattern, such that at least a portion of light transmitted into the transmit/receive region and diffracted by the first pattern of opaque portions is blocked by the second pattern of opaque portions from reaching the sensor of the camera, wherein an aperture of the first light-blocking layer defines an opening (1211, 1311, 1511, 1611) having a central axis which is parallel to a propagation direction of the light, and wherein an inside edge, being the closest edge to the central axis, of the second light-blocking layer is located below the first light-blocking layer and farther away from the central axis than a line parallel to the central axis and extending from an inside edge of the first light-blocking layer that defines the opening.