PROJECTOR AND METHOD OF CONTROLLING PROJECTOR

• US 20100103385A1
• Filed: 10/26/2009
• Published: 04/29/2010
• Est. Priority Date: 10/29/2008
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: KUBOTA, Shinji
• Granted Patent: US 8,382,291 B2
• Time in Patent Office: Days
• US Class Current: 353/70
• CPC Class Codes: G03B 21/147 Optical correction of image distortions, e.g. keystone
• CPC Class Codes: H04N 9/3185 Geometric adjustment, e.g. keystone or convergence optical or mechanical adjustment of convergence H04N9/317; using scanning means H04N3/22; optical or mechanical adjustments of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/14
• CPC Class Codes: H04N 9/3194 including sensor feedback

Abstract

A projector adapted to perform display by projecting an image on a projection surface, includes: a light source; a light modulator adapted to modulate light from the light source into image light representing the image; a projection optical system adapted to project the image light modulated by the light modulator on the projection surface; a keystone distortion correction section adapted to perform a keystone distortion correction process for correcting keystone distortion of the image to be projected on the projection surface; a detection section adapted to detect start of movement of the projector; and a control section adapted to cancel the keystone distortion correction process in the keystone distortion correction section in response to detection of start of movement of the projector in the detection section.

Claims

1. A projector adapted to perform display by projecting an image on a projection surface, comprising:

a light source;

a light modulator adapted to modulate light from the light source into image light representing the image;

a projection optical system adapted to project the image light modulated by the light modulator on the projection surface;

a keystone distortion correction section adapted to perform a keystone distortion correction process for correcting keystone distortion of the image to be projected on the projection surface;

a detection section adapted to detect start of movement of the projector; and

a control section adapted to cancel the keystone distortion correction process in the keystone distortion correction section in response to detection of the start of movement of the projector in the detection section.

2. The projector according to claim 1, further comprising:

a storage section adapted to store guide pattern data representing a guide pattern indicating a center of a maximum area capable of modulating the light from the light source in the light modulator,

wherein the control section cancels the keystone distortion correction process in the keystone distortion correction section, and make the light modulator modulate the image light representing the guide pattern based on the guide pattern data stored in the storage section.

3. The projector according to claim 1, wherein

the detection section is provided with an angular velocity sensor adapted to detect an angular velocity of the projector, and detects the movement of the projector in response to the angular velocity detected by the angular velocity sensor exceeding a first value previously determined.

4. The projector according to claim 1, wherein

the detection section detects stop of movement of the projector, and

the control section, in response to detection of the stop of movement of the projector in the detection section, makes the keystone distortion correction section restart the keystone distortion correction process.

5. The projector according to claim 4, wherein

the detection section is provided with an angular velocity sensor adapted to detect an angular velocity of the projector, and detects stop of movement of the projector in the case in which the angular velocity detected by the angular velocity sensor exceeds a first value previously determined, then becomes lower than a second value lower than the first value, and a predetermined time has elapsed while the angular velocity is kept lower than the second value.

6. A method of controlling a projector adapted to perform display by projecting an image on a projection surface, the method comprising:

(a) performing a keystone distortion correction process for correcting keystone distortion of the image to be projected on the projection surface;

(b) detecting start of movement of the projector; and

(c) canceling the keystone distortion correction process in response to detection of start of movement of the projector.

7. The method of controlling projector according to claim 6, further comprising:

(d) projecting a guide pattern indicating a center of a maximum area capable of modulating light from a light source while the keystone distortion correction process is canceled.

8. The method of controlling projector according to claim 6, further comprising:

(e) detecting stop of movement of the projector; and

(f) restarting the keystone distortion correction process in response to detection of the stop of movement of the projector.