Patent ID: 11940759
Assignee: ENVISICS LTD
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 19:
20. A projector arranged to project an image within a display area on a display plane, wherein the image comprises a light feature comprising a dark region surrounded by a light region, and the projector comprises a light sensor spatially separated from the display plane, wherein the display area and the light sensor are arranged such that, when operated in an aligned state, light forming the light feature of the image on the display plane is at least partially disposed around, without impinging on, a reference point of the light sensor, wherein the aligned state defines a selected alignment between the reference point of the light sensor and a reference point on the display plane; and wherein, when operated in the aligned state, a reference point in the dark region of the light feature is coincident with the reference point of the light sensor.