Projector and electronic device having projector function

Patent metadata

Field	Value
Publication number	US-9606637-B2
Application number	US-201414244458-A
Country	US
Kind code	B2
Filing date	Apr 3, 2014
Priority date	Apr 4, 2013
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A projector includes a laser beam scanning portion, a light detecting portion, and a control portion performing control of predicting a prediction region where a detection object exists on the basis of detection of the detection object, changing a modulation pattern of a laser beam when the laser beam is scanned on the prediction region, acquiring the position of the detection object on the basis of reflected light of the laser beam emitted in a detection object detection pattern, and setting the position of the detection object to an indication position.

First claim

What is claimed is:

1. A projector comprising:
a laser beam scanning portion scanning a laser beam having a first characteristic that forms an image on a projection surface;
a light detecting portion receiving reflected light of the laser beam scanned by the laser beam scanning portion, reflected by a detection object; and
a control portion performing control of predicting a region where the detection object exists on the basis of detection of the detection object, changing a characteristic of the laser beam to a second characteristic when the laser beam is scanned on the region, acquiring a position of the detection object on the basis of the reflected light of the laser beam emitted with the second characteristic, and setting the position of the detection object to an indication position indicated by the detection object;
wherein the control portion acquires a centerline passing through a substantially central portion of a region where the detection object exists by the reflected light of the laser beam emitted with the second characteristic and sets the position of the detection object acquired on the basis of the centerline to the indication position indicated by the detection object.

2. The projector according to claim 1 , wherein
the control portion detects the detection object in a state where the characteristic of the laser beam is set to the first characteristic and changes the characteristic of the laser beam to the second characteristic when the laser beam is scanned on the region on the basis of the detection of the detection object.

3. The projector according to claim 1 , wherein
the control portion sets an intersection between the centerline and a first scanning line in which the detection object is detected to the indication position indicated by the detection object.

4. The projector according to claim 1 , wherein the control portion acquires the centerline on the basis of the reflected light of the laser beam emitted with the second characteristic in each of a plurality of scanning lines.

5. The projector according to claim 1 , wherein
the control portion sets a characteristic change section in which the characteristic of the laser beam is changed to the second characteristic in the region in a scanning line scanned subsequent to a prescribed scanning line on the basis of the detection of the detection object in the prescribed scanning line.

6. The projector according to claim 5 , wherein
the control portion controls the characteristic to emit the laser beam of a single color as the second characteristic to the characteristic change section.

7. The projector according to claim 6 , wherein
the control portion controls the characteristic to emit the laser beam of a white or red color as the second characteristic.

8. The projector according to claim 6 , further comprising red, green, and blue laser beam sources emitting laser beams of colors different from each other to the laser beam scanning portion, wherein
the control portion controls the red, green, and blue laser beam sources to change the characteristic of the laser beams emitted from the red, green, and blue laser beam sources to the second characteristic of the single color when the laser beams are scanned on the region.

9. The projector according to claim 5 , wherein
the control portion sets the characteristic change section in correspondence to a detection position of the detection object in at least a single scanning line immediately prior to a scanning line in which the characteristic change section is set.

10. The projector according to claim 9 , wherein
the control portion sets the characteristic change section in correspondence to detection positions of the detection object in a plurality of scanning lines including an immediately prior single scanning line.

11. The projector according to claim 5 , wherein
the control portion performs control of setting a width of the characteristic change section to be smaller than a width of the region of the detection object in a scanning direction of the scanning line.

12. The projector according to claim 11 , wherein
the characteristic change section includes a detection section in which the characteristic of the laser beam is changed to the second characteristic, and
the control portion performs control of emitting the laser beam having a modulation range more restricted than the characteristic of an image region where the image is formed to adjustment sections located on both sides of the detection section in the region of the detection object.

13. The projector according to claim 12 , wherein
the control portion restricts a gradation value of the laser beam emitted to regions of the adjustment sections closer to the detection section to be smaller.

14. The projector according to claim 12 , wherein
the adjustment sections located on both sides of the detection section have widths substantially equal to each other in the scanning direction of the scanning line.

15. The projector according to claim 5 , wherein
the control portion changes the characteristic of the laser beam emitted to the characteristic change section to the second characteristic during a period until a frame subsequent to a frame in which the detection object is detected is displayed after the detection object is detected.

16. The projector according to claim 5 , wherein
the control portion sets the characteristic change section on the basis of acquired information of the detection object in a frame prior to a frame in which the detection object is detected when the indication position indicated by the detection object is acquired in the frame prior to the frame in which the detection object is detected.

17. The projector according to claim 12 , wherein
the control portion acquires the centerline passing through the substantially central portion of the region where the detection object exists on the basis of data of a detection position of the detection object in a case where a difference between the detection position of the detection object and a position of a center point of the detection section in the scanning direction of the scanning line is not more than a prescribed value.

18. The projector according to claim 5 , wherein
the control portion performs control of acquiring a width of the detection object in the scanning direction and setting a width of the characteristic change section to be smaller than a width of the detection object in a direction along the scanning direction.

19. A projector comprising:
a laser beam scanning portion scanning a laser beam having a first characteristic that forms an image on a projection surface;
a light detecting portion receiving reflected light of the laser beam scanned by the laser beam scanning portion, reflected by a detection object; and
a control portion that acquires a centerline of the detection object and sets the position of the detection object acquired on the basis of the centerline to an indication position indicated by the detection object, wherein
the control portion controls predicting a region where the detection object exists on the basis of detection of the detection object, and changes a characteristic of the laser beam to a second characteristic when the laser beam is scanned on the region.

20. The projector according to claim 19 , wherein
the control portion acquires a position of the detection object on the basis of the reflected light of the laser beam emitted with the second characteristic, and sets the position of the dete

Assignees

• Funai Electric Co

Inventors

• Chikaoka Atsuhiko

Classifications

• H04N9/3194

  including sensor feedback · CPC title

• G06F3/033

  Pointing devices displaced or positioned by the user {, e.g. mice, trackballs, pens or joysticks}; Accessories therefor (digitisers characterised by the transducing means G06F3/041) · CPC title

• G06F1/1673

  Arrangements for projecting a virtual keyboard · CPC title

• H04N9/3129

  scanning a light beam on the display screen (scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161) · CPC title

• G06F3/0325 Primary

  using a plurality of light emitters or reflectors or a plurality of detectors forming a reference frame from which to derive the orientation of the object, e.g. by triangulation or on the basis of reference deformation in the picked up image · CPC title