Projection type display apparatus
AssigneeCanon Kabushiki Kaisha
InventorAkihiro Fujiwara
Life of this patent
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Abstract
A projection type display apparatus includes a projection portion for projecting an image onto a surface to be projected, a light receiving portion disposed apart from the projection portion by a base line length and used for detecting a reference image projected onto the surface to be projected, and a scanning portion for scanning the reference image on the surface to be projected in a direction of the base line length, in which the projection portion is focused based on information about a scanning position of the reference image upon predetermined detection with the light receiving portion. With the projection type display apparatus, a system can be configured with a simple processing circuit, and cost reduction can be realized.
Claims6
A projection type display apparatus, comprising:
- a projection portion for projecting a reference image formed on an image forming element onto a surface to be projected;
- a light receiving portion placed apart from the projection portion by a base line length and used for detecting the reference image projected onto the surface to be projected;
- and
- a transmitting portion for transmitting an image signal to the image forming element of said projection portion in such a way that the reference image is electronically scanned by said projection portion without using mechanical scanning means on the surface to be projected in a direction of the base line length,
- wherein focusing in the projection portion is performed based on information about a scanning position of the reference image upon predetermined detection with the light receiving portion.
Dependencies are inferred from the claim text.