Patent ID: 8079714
Filing Date: 2011-12-20
Classification: G03B,G06F,H04N

Abstract:
1. A projector for acquiring a coordinate of a bright spot, the bright spot being formed by an indicating light incident onto a projection area, the projector comprising: a light source configured to project and a zooming system, wherein a light ray emitted from the light source is projected onto the projection area to display a projection image via the zooming system; a half transparent and half reflecting mirror provided on a light path between the light source and the zooming system, for reflecting an external light ray, which is reflected from the projection area and then incident on the half transparent and half reflecting mirror via the zooming system, wherein reflection of the light ray and the indicating light from the projection area results in the external light ray which comprises the projection image and a bright spot image of the bright spot; an imager configured to capture the external light ray reflected by the half transparent and half reflecting mirror; and a processor configured to acquire the coordinate of the bright spot according to the bright spot image captured by the imager.