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EP-3379394-B1 - IMAGE DISPLAY APPARATUS AND METHOD FOR CONTROLLING THE SAME

EP3379394B1EP 3379394 B1EP3379394 B1EP 3379394B1EP-3379394-B1

Inventors

  • WAKIMOTO, SHINGO

Dates

Publication Date
20260506
Application Date
20180322

Claims (4)

  1. A method for controlling the image display apparatus (1) of claim 4, the method comprising: controlling (S101) the motor controller (32a) to lift the light curtain (L) to a maximum lifted position; controlling (S102) the motor controller (32a) to lower the light curtain (L); controlling (S103) the imager (21) to repeatedly capture images of the display screen (SC); the position detector (25b) detecting (S104) a reflected position (E), based on the captured images from the imager, where the light outputted by the laser light source unit (31) is reflected during the period for which the light curtain is being lowered; outputting the result of the detection of the reflected position from the position detector to the change controller (25c); the change controller evaluating (S105), based on the result of the detection of the reflected position, whether or not a coincidence situation in which the reflected position (E) coincides with the target position (D) during the period for which the light curtain is lowered has occurred; in a case where the coincidence situation occurs during the period for which the light curtain is being lowered, the change controller either: controlling (S106) the motor controller (32a) to move the reflected position (E) to the target position (D) after the coincidence situation has occurred, or controlling the motor controller to stop (S106) lowering the light curtain when the coincidence situation occurs; in a case where the coincidence situation does not occur during the period for which the light curtain is lowered, until the reflected position reaches a first position (E1) in a projection image (P1), the change controller controlling (S107) the motor controller (32a) to move the light curtain to a θ-direction minimum position, which is the lowest possible position of the light curtain, and further performing the steps of: determining (S108) whether a line formed by the reflected position (E) is parallel to a lower end (L1) of the light curtain, in the case that the line formed by the reflected position is not parallel to the lower end, the change controller outputting (S109) to the motor controller a first control signal (S) configured to run a motor (32d) in such a way that the line formed by the reflected position becomes parallel to the lower end, the motor controller controlling the motor driver (32c) in accordance with the first control signal to cause the line formed by the reflected position to be parallel to the lower end (L1), the change controller outputting to the motor controller (S110) a second control signal configured to cause the motor (32d) to lift the light curtain to a position such that the reflected position is lower than the first position (E1) and is within the projected image (P1), the motor controller controlling the motor driver (32b) in accordance with the second control signal to lift the light curtain, the change controller measuring (S111) the relationship between a number of revolutions (G) produced by the motor lifting the light curtain and an amount of movement (M) of the reflected position (E) resulting from the number of revolutions, the change controller determining (S112), based on the relationship between the number of revolutions and the amount of movement, a target number of revolutions (T), which allows the reflected position to be moved to the target position (D), the change controller outputting (S113) to the motor controller a third control signal that causes the motor to produce the target number of revolutions (T), the motor controller controlling the motor driver in accordance with the third control signal to cause the motor (32d) to produce the target number of revolutions (T), such that the reflected position (E) moves to the target position (D), attempting to detect the reflected position (S114) after the reflected position has moved to the target position, and in the case that the reflected position has been detected, the change controller outputting (S115) to the motor controller a fourth control signal that causes the motor to lift the light curtain until no reflected position is detected, the motor controller controlling the motor driver (32b) in accordance with the fourth control signal to lift the light curtain until no reflected position is detected.
  2. The method according to claim 1, wherein the change controller (25c) increases an amount of the light outputted from the laser light source unit (31) in a case where the position detector (25b) does not detect the reflected position (E) at a target position (D) on a side opposite the laser light source unit (31) with respect to the image on the display surface (SC) even after the change controller controls the changer (32).
  3. The method according to claim 1 or claim 2, wherein the change controller (25c) increases sensitivity of the imager (21) in a case where the position detector (25b) does not detect the reflected position (E) at a target position (D) on a side opposite the laser light source unit (31) with respect to the image on the display surface (SC) even after the change controller controls the changer (32).
  4. An image display apparatus (1) comprising: a projector (2) configured to display an image on a display surface (SC); a laser light source unit (31) configured to output light; an imager (21) configured to capture an image of the display surface to produce a captured image; a position detector (25b) configured to detect a reflected position (E), based on the captured images from the imager, where the light outputted by the laser light source unit (31) is reflected; characterized in that the image display apparatus (1) further comprises: a motor controller (32a) that is configured to control a light curtain (L) projected on the display surface (SC), the light output by the laser light source unit (31) forming the light curtain (L); a changer (32) that includes the motor controller (32a), motor drivers (32b and 32c), motors (32d and 32e) and an adjustment mechanism (32f, 32g) configured to change an angle of the light outputted from the laser light source unit (31) with respect to the display surface (SC) in accordance with a drive action of the motor drivers; and a change controller (25c) configured to control the motor controller (32a) to lower the light curtain (L), and to control the imager (21) to repeatedly capture images of the display screen (SC).

Description

BACKGROUND 1. Technical Field The present invention relates to an image display apparatus and a method for controlling the same. 2. Related Art JP-A-2015-159529 describes what is called an interactive projector that outputs planar detection light along a projection surface and detects the detection light reflected off a pointing element, such as a pen and a finger, to identify the position of the pointing element. The projector described in JP-A-2015-159529 projects an image that assists adjustment of the orientation of the detection light based on the detection light reflected off a jig placed by a user on the projection surface. The user adjusts the orientation of the detection light while looking at the image. In the case of the projector described in JP-A-2015-159529, to adjust the orientation of the detection light, the user needs to place the jig on the projection surface, and the adjustment task is therefore cumbersome. US 2015/204659 A1 discloses a reflector that is used for adjusting a radiation direction of a radiation unit in a position detection apparatus that performs a process based on a detected position of reflected light of light radiated from the radiation unit. The reflector includes a first reflection surface that reflects the light radiated from the radiation unit, and a second reflection surface that intersects with the first reflection surface and reflects the light radiated from the radiation unit. SUMMARY An advantage of some aspects of the invention is to provide a technology that allows reduction in cumbersomeness of the detection light orientation adjustment task as compared with the case where the user places the jig on the projection surface. According to a first aspect of the invention there is provided a method for controlling an image display apparatus according to claim 1. According to the aspect described above, the angle of the light outputted from the output section with respect to the display surface is changed based on the result of the detection of the reflected position, where the light outputted by the output section is reflected. Therefore, as compared with a case where a user places a jig on the display surface and adjusts the orientation of the light outputted by the output section, the cumbersomeness of the adjustment task can be reduced. According to the aspect described above, the angle of the light outputted from the output section with respect to the display surface can be automatically adjusted by controlling the drive action of the drive section. According to the aspect described above, for example, even in a case where low-intensity reflected light does not allow the position detector to detect the target position as the reflected position even after the change controller controls the drive action of the drive section, the reflected position can be moved to the target position. According to a second aspect of the invention there is provided an image display apparatus according to claim 4. According to the aspect described above, as compared with the case where the user places a jig on the display surface and adjusts the orientation of the light outputted by the output section, the cumbersomeness of the adjustment task can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS Embodiments of the invention will now be described by way of example only with reference to the accompanying drawings, wherein like numbers reference like elements. Fig. 1 diagrammatically shows an image display apparatus according to a first embodiment.Fig. 2 is a side view of the image display apparatus viewed in the direction indicated by the arrow shown in Fig. 1.Fig. 3 shows a projector and a light curtain generator.Fig. 4 shows the directions in which a laser light source unit is adjusted.Fig. 5 is a flowchart for describing the action of the image display apparatus.Fig. 6 shows a state in which a light curtain is located in a θ-direction maximum position.Fig. 7 shows an example of a screen having an area where a protrusion is provided.Fig. 8 shows a captured image in a case where a first position is present in a projection image.Fig. 9 shows a captured image in a case where the light curtain is located in a θ-direction minimum position.Fig. 10 shows a captured image in a case where the line formed by a reflected position is caused to be parallel to a lower end.Fig. 11 shows a captured image in a case where the reflected position is located in a target position.Fig. 12 diagrammatically shows a variation. DESCRIPTION OF EXEMPLARY EMBODIMENTS An embodiment according to the invention will be described below with reference to the drawings. In the drawings, the dimension and scale of each portion differ from actual values as appropriate. Further, since the embodiment described below is a preferable specific example of the invention, a variety of technically preferable restrictions are imposed on the embodiment. The scope of the invention is, however, determined by the appended claims. First