Head wearable display device with image monitoring

A method, comprising:

• providing a waveguide display of a head wearable display device, the waveguide display implemented at least one of in or on the head wearable display device, the waveguide display comprising a waveguide and an optical system;
• receiving, by the optical system, image data corresponding to an image;
• projecting, by the optical system, the image at least through the waveguide to be displayed to a user;
• providing at least one image monitor sensor of the head wearable display device, each of the at least one image monitor sensor implemented in or on the head wearable display device, each of the at least one image monitor sensor optically coupled to the waveguide or the optical system of the waveguide display;
• capturing, by each of the at least one image monitor sensor, at least a portion of the image as a monitored image;
• outputting, by each of the at least one image monitor sensor, monitored image data corresponding to the monitored image;
• providing at least one processor, each of the at least one processor implemented in the head wearable display device or in a computing device separate from the head wearable display device;
• receiving, by the at least one processor, the monitored image data from each of the at least one image monitor sensor;
• and
• based at least on the monitored image data, determining, by the at least one processor, whether the waveguide display displayed the image correctly.