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US 7,889,153 B2Granted
Projection-type display device and software program
AssigneeRicoh Company, Ltd.
InventorsTakashi Kitaguchi, Tomofumi Kitazawa, Saburo Sasaki
Life of this patent
Estimating the term…
Abstract
A projection surface on which a predetermined projection image is projected is provided; a writing surface on which an image can be drawn directly in a superimposing manner with a projection image displayed on the projection surface is provided; and a photography part photographing an image drawn on the writing surface by means of an image-pickup part comprising two-dimensionally-disposed pixels is provided.
Claims18
A projection-type display device comprising:
- a projection part;
- a projection screen allowing an image from said projection part to transmit therethrough to display the same;
- a writing sheet on which writing is carried out by using ink, and distinctly formed from the projection screen;
- a photography part photographing a written image written on said writing sheet by using the ink, wherein:
- said photography part takes a picture of an image written on the writing sheet from an opposite side of the writing sheet than on which the image is written;
- and
- said writing sheet is in contact with one surface of said projection screen.
4 more elements
Dependencies are inferred from the claim text.