JP2011075771A - Projection type display device with position detecting function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection type display device with a position detecting function that can detect XYZ coordinates of an object even though many light emitting elements and light receiving elements are not used. <P>SOLUTION: The projection type display device with a position detecting function 100 is constituted by adding a position detecting function to a projection type display device including an image projection device 200. The image projection device 200 is provided with the plurality of light emitting elements 12 emitting position detecting light composed of infrared light toward a detection area, so as to form intensity distribution of the position detecting light. A data processing part 50 detects the XYZ coordinates of the object Ob based on a result obtained by detecting light reflected on the object Ob in the detection area 10R by a photodetector 30, and also allows the image projection device 200 to perform various modes based on the Z coordinate. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a projection display device with a position detection function capable of projecting an image and optically detecting the position of a target object in a detection region set on the image projection side.

  In recent years, electronic devices such as mobile phones, car navigation systems, personal computers, ticket machines, and bank terminals have used display devices with a position detection function in which a touch panel is arranged on the front surface of an image generation device such as a liquid crystal device. The display device with a detection function inputs information while referring to an image displayed on the image generation device. Such a touch panel is configured as a position detection device that detects the position of a target object within a detection region (see, for example, Patent Document 1).

  The position detection device described in Patent Document 1 is an optical type, and in a direct-view display device, a detection region is set on the image display surface side, and a plurality of light emitting diodes and a plurality of phototransistors are provided on both sides of the detection region. It has an arranged configuration. In such a position detection device, when the target object enters the detection area, the light is blocked by the target object. Therefore, the position of the target object can be detected by specifying a phototransistor that is blocked by the light.

  On the other hand, an object detection sensor that detects the distance to the target object is provided in the projection display device, and when the target object is located near the front of the projection display device, the amount of light projected from the projection display device is reduced. There has been proposed a technique for preventing eyes from being damaged when a person looks into a lens of a projection display device (see, for example, Patent Document 2).

FIG. 7 of Japanese Patent Laid-Open No. 2001-142463. FIG. 1 of JP2008-250242A

  The inventor of the present application sets a detection region on the projection side of an image such as the vicinity of a screen in a projection display device, and detects a XYZ coordinate of a target object in the detection region, that is, with a position detection function A projection display device is proposed. However, with the configuration described in Patent Document 2, only the position in the projection direction (Z-axis direction) can be detected. Further, when detecting the XY coordinates, employing the configuration described in Patent Document 1 is not practical because a large number of light emitting diodes and phototransistors need to be arranged around the detection region.

  In view of the above problems, an object of the present invention is to provide a projection display device with a position detection function that can detect XYZ coordinates of a target object without using a large number of light emitting elements and light receiving elements. It is in.

  In order to solve the above-described problems, the present invention is a position detection function for projecting an image from an image projection device and optically detecting the position of a target object in a detection region set on the side on which the image is projected. The image projection device is a position-detecting display device that emits position detection light composed of infrared light toward the detection region and forms an intensity distribution of the position detection light in the detection region. A light source unit, a photodetector that detects the position detection light reflected by the target object in the detection region, and a data processing unit that performs data processing of a light reception result of the photodetector. When the projection direction is the Z-axis direction and two directions intersecting the projection direction of the image are the X-axis direction and the Y-axis direction, the data processing unit is configured so that the position detection light source unit is in the X-axis direction. Formed the intensity distribution An X-coordinate detector that detects an X-coordinate of the target object based on a detection result of the photo detector, and the light detection when the position detection light source unit forms the intensity distribution in the Y-axis direction. A Y-coordinate detection unit that detects a Y-coordinate of the target object based on a detection result in the detector, and a detection result in the photodetector when the position detection light source unit forms the intensity distribution in the Z-axis direction. And a Z-coordinate detection unit that detects the Z-coordinate of the target object.

  In the present invention, when adding the XYZ coordinate detection function to the projection display device, position detection light composed of infrared light is emitted from the position detection light source unit provided in the image projection device toward the detection region, The position detection light reflected by the target object in the detection area is detected by a photodetector. Here, since the position detection light emitted from the position detection light source unit forms an intensity distribution in the detection region, if the relationship between the position in the detection region and the intensity of the position detection light is known in advance, the position detection light The detection unit can detect the XYZ coordinates of the target object based on the light reception result of the photodetector. In addition, since the position detection light source unit, the light detector, and the data processing unit are all provided in the image projection apparatus, they are convenient to carry, and there are many position detection light sources and light receiving elements around the detection area. There is no need to provide it.

  In the present invention, it is preferable that the data processing unit includes a mode determination unit that causes the image projection apparatus to perform different modes based on the Z coordinate. In the case of a projection display device, there is a request to switch the operation of the image projection device depending on which position in the projection direction the target object exists. In the present invention, however, the Z coordinate of the target object is detected. Can respond to such requests.

  In the present invention, when the mode determination unit determines that the distance of the target object from the image projection device is within a set close distance based on the Z coordinate, the mode determination unit is configured to display the display light projected from the image projection device. It is preferable to cause the image projection apparatus to perform a safe mode for reducing luminance. According to such a configuration, when a person looks into the projection lens of the image projection apparatus, the brightness of the display light is reduced, so that the eyes can be prevented from being damaged.

  In the present invention, when the Z coordinate is within the XY coordinate determination setting range, the mode determination unit uses the X coordinate detected by the X coordinate detection unit and the Y coordinate detected by the Y coordinate detection unit as the target object. It is preferable to cause the image projection apparatus to perform an XY coordinate determination mode in which the XY coordinates are determined. According to such a configuration, a certain range in the projection direction of the display light can be set as the setting range for XY coordinate determination. For example, when a person passes in front of the image display device, the presence of the target object is determined. Since it is not regarded as input, it is possible to prevent erroneous input.

  In the present invention, the mode determination unit is configured such that the Z coordinate is out of both the set close distance and the set range for XY coordinate determination, and the X coordinate and the target object are separated from the image projection apparatus. When both of the Y coordinates are detected, it is preferable to cause the image projection apparatus to perform an entry information generation mode for generating entry information indicating that the target object has entered the detection area. According to such a configuration, it is possible to predict in advance that an input will be made in the near future, so that preparations can be made. Further, when a person passes in front of the image display device, it can be quickly determined that the presence of the target object is not regarded as an input.

  In the present invention, the mode determination unit may update an image display condition in the image projection device based on the Z coordinate when both the X coordinate and the Y coordinate are not detected even when the Z coordinate is detected. It is preferable to cause the image projection apparatus to perform a display condition change mode. If both the X coordinate and the Y coordinate are not detected even when the Z coordinate is detected, the Z coordinate can be determined as the screen position. Therefore, since the distance between the image projection apparatus and the screen is known, the brightness adjustment of the display light, the image adjustment, and the like can be automatically performed according to the distance.

  In the present invention, it is preferable that the position detection light source unit emits the position detection light from a front surface portion where a projection lens that projects the image is positioned in the image projection apparatus. If comprised in this way, the emission direction of the light for image display and the position detection light can be adjusted only by adjusting the direction which the front part of an image projector is facing.

  In this invention, it is preferable that the said photodetector is provided in the said front part of the said image projector. Both the image display light and the position detection light are emitted in the same direction, and the photodetector needs to be directed in the same direction. Therefore, if the light detector is provided on the front surface portion of the image projection apparatus, it is only necessary to adjust the direction in which the front surface portion of the image projection apparatus faces, and the emission direction of the image display light and the position detection light, and the light detector The direction in which the center of the optical axis faces can be adjusted.

It is explanatory drawing which shows typically the structure of the projection type display apparatus with a position detection function to which this invention is applied. It is explanatory drawing of the image projection apparatus used for the projection type display apparatus with a position detection function to which this invention is applied. It is explanatory drawing which shows the structure of the data processing part etc. of the projection type display apparatus with a position detection function to which this invention is applied. It is explanatory drawing which shows the positional relationship etc. of the detection area | region and light emitting element in the projection type display apparatus with a position detection function to which this invention is applied. It is explanatory drawing which shows a mode that the light emitting element forms the intensity distribution of position detection light in a detection area | region in the projection type display apparatus with a position detection function to which this invention is applied. It is explanatory drawing which shows the signal processing content in the projection type display apparatus with a position detection function to which this invention is applied. It is explanatory drawing which shows the control content with respect to the light emitting element in the projection type display apparatus with a position detection function to which this invention is applied. It is a flowchart which shows the process example for performing mode determination in the projection type display apparatus with a position detection function to which this invention is applied.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, it is assumed that the axes intersecting each other are the X axis, the Y axis, and the Z axis, and an image is projected in a direction along the Z axis. In the drawings referred to below, for convenience of explanation, the X-axis direction is represented as a horizontal direction and the Y-axis direction is represented as a vertical direction. In the drawings referred to below, one side in the X-axis direction is the X1 side, the other side is the X2 side, one side in the Y-axis direction is the Y1 side, and the other side is the Y2 side.

[Overall configuration of projection display device with position detection function]
FIG. 1 is an explanatory diagram schematically showing a configuration of a projection display device with a position detection function to which the present invention is applied. FIGS. 1 (a) and 1 (b) are views of a projection display device with a position detection function. It is explanatory drawing which shows a mode that the part was seen from diagonally upward, and explanatory drawing which shows a mode that it looked at from the horizontal direction. FIG. 2 is an explanatory diagram of an image projection apparatus used in a projection display apparatus with a position detection function to which the present invention is applied. FIGS. 2A and 2B are views when the image projection apparatus is viewed from the front side. It is explanatory drawing and explanatory drawing which shows the electrical structure etc. of a projection type display apparatus with a position detection function. FIG. 3 is an explanatory diagram showing a configuration of a data processing unit and the like of a projection display device with a position detection function to which the present invention is applied.

  A projection display device 100 with a position detection function shown in FIGS. 1A and 1B and FIGS. 2A and 2B is an image projection device 200 called a liquid crystal projector or a digital micromirror device. The image projection apparatus 200 enlarges and projects the image display light L1 toward the screen 290 from the projection lens 210 (see FIG. 2A) provided on the front surface portion 201 of the housing 250. Therefore, the image projection apparatus 200 includes an optical device 280 that generates color image display light inside the housing 250 and emits it through the projection lens 210. In this embodiment, the screen 290 is a horizontally long rectangle.

  As described below, the projection display device 100 with a position detection function according to the present embodiment optically determines the position of the target object Ob in the detection area 10R set on the image projection side (front of the screen 290). It has a function to detect. In the projection display device 100 with a position detection function according to this embodiment, the XY coordinates of the target object Ob are handled as input information for designating a part of the projected image, and the image is switched based on the input information. .

  In realizing such a position detection function, the projection display device 100 with a position detection function according to the present embodiment emits position detection light L2 made of infrared light toward the detection region 10R and outputs the position detection light to the detection region 10R. A position detection light source unit 11 that forms an intensity distribution of L2 is provided. Further, the projection display device 100 with a position detection function includes a photodetector 30 that detects the position detection light L3 reflected by the target object Ob in the detection region 10R, and a target object Ob based on the light reception result of the photodetector 30. And a data processing unit 50 for detecting the position of.

  As shown in FIGS. 2A and 2B, in the projection display device 100 with a position detection function of this embodiment, the position detection light source unit 11 includes a plurality of light emitting elements 12 that emit infrared light, and these. In this embodiment, the position detection light source unit 11 (the light emitting element 12 and the light source drive unit 14) is provided in the image projection apparatus 200. Yes. More specifically, the front surface 201 of the image projection apparatus 200 is provided with a projection lens 210 at a substantially central position in the X-axis direction, and the projection lens 210 is disposed on both sides in the X-axis direction in the front surface 201. A plurality of light emitting elements 12 are provided.

  In this embodiment, the light emitting element 12 (the first light emitting element 12a, the second light emitting element 12b, the third light emitting element 12c, and the fourth light emitting element 12d) is configured by an LED (light emitting diode) or the like, and is a position made of infrared light. The detection lights L2a to L2d are emitted as diverging light. The position detection light L2 (position detection light L2a to L2d) preferably has a wavelength range that is efficiently reflected by the target object Ob such as a finger or a touch pen. Therefore, if the target object Ob is a human body such as a finger, it is desirable that the infrared ray has a high reflectivity on the surface of the human body (particularly near infrared light close to the visible light region, for example, near 850 nm in wavelength) or 950 nm. In this embodiment, each of the light emitting elements 12 emits infrared light having a peak wavelength in the wavelength region near 850 nm. An optical member such as a scattering plate or a prism sheet may be disposed on the light emitting surface side of the light emitting element 12.

  The light source driving unit 14 includes a light source driving circuit 140 that drives the light emitting element 12 and a light source control unit 145 that controls each lighting pattern of the plurality of light emitting elements 12 via the light source driving circuit 140. The light source driving circuit 140 includes a first light source driving circuit 140a that drives the first light emitting element 12a, a second light source driving circuit 140b that drives the second light emitting element 12b, and a third light source driving that drives the third light emitting element 12c. The circuit 140c and the 4th light source drive circuit 140d which drives the 4th light emitting element 12d are provided. The light source controller 145 controls all of the first light source driving circuit 140a, the second light source driving circuit 140b, the third light source driving circuit 140c, and the fourth light source driving circuit 140d.

  In the present embodiment, the light detector 30 and the data processing unit 50 are also provided in the image projection device 200, similarly to the position detection light source unit 11, and the data processing unit 50 is disposed inside the image projection device 200. ing.

  The photodetector 30 is provided on one side in the Y-axis direction with respect to the projection lens 210 in the front surface portion 201 of the image projection apparatus 200. The photodetector 30 includes a photodiode, a phototransistor, and the like. In this embodiment, a photodiode is used. Here, the photodetector 30 is electrically connected to the data processing unit 50, and the detection result of the photodetector 30 is output to the data processing unit 50.

  As shown in FIG. 3, the data processing unit 50 includes a position detection unit 51 that detects the XYZ coordinates of the target object Ob based on the detection result of the photodetector 30. The position detection unit 51 includes a signal processing unit 52 that processes a detection signal from the photodetector 30, an X coordinate detection unit 53, a Y coordinate detection unit 54, and a Z coordinate detection unit 55, and performs signal processing. The unit 52 includes an amplifier 521, a filter 522, an A / D conversion circuit 523, and the like.

  In the projection display device 100 with a position detection function according to the present embodiment, the data processing unit 50 includes a mode determination unit 56 that causes the image projection device 250 to perform different modes based on the Z coordinate. In addition, the data processing unit 50 includes a safe mode execution unit 571 that executes various modes, a display condition change unit 572, an XY coordinate determination unit 573, and an approach information generation unit 574 based on the determination by the mode determination unit 56. . A detailed description of the function of the data processing unit 50 will be described later with reference to FIG.

(Intensity distribution of position detection light)
FIG. 4 is an explanatory diagram showing the positional relationship between the detection region 10R and the light emitting element 12 in the projection display device 100 with a position detection function to which the present invention is applied, and FIGS. 4 (a) and 4 (b) show the light emission. FIG. 10 is an explanatory diagram showing a state in which an intensity distribution is formed by position detection light emitted from the element 12, and an explanatory diagram showing a positional relationship between a detection region 10R and the central optical axis of the light emitting element 12. FIG. 5 is an explanatory diagram showing how the light emitting element 12 forms an intensity distribution of position detection light in a detection region in the projection display device 100 with a position detection function to which the present invention is applied.

  As shown in FIGS. 1A and 4, in this embodiment, the detection region 10 </ b> R is a horizontally long rectangle, and in the image projection apparatus 200, four light emitting elements 12 (first light emitting element 12 a, second light emitting element 12 b, first The three light emitting elements 12c and the fourth light emitting elements 12d) are arranged at positions corresponding to the corners of a virtual square.

  As shown in FIG. 4, all of the four light emitting elements 12 (the first light emitting element 12a, the second light emitting element 12b, the third light emitting element 12c, and the fourth light emitting element 12d) are centered at different positions on the detection region 10R. The optical axis is pointing. All of the four light emitting elements 12 have the central optical axis directed to the outer peripheral end of the detection region 10R. More specifically, the first light emitting element 12a has the central optical axis 121a facing the corner portion 10Ra of the detection region 10R, and the second light emitting element 12b has an angle with the center position 10Ro of the detection region 10R interposed therebetween. The central optical axis 121b is directed to the corner portion 10Rb opposite to the portion 10Ra. Further, the third light emitting element 12c and the fourth light emitting element 12d have the central optical axes 121c and 121d directed at positions different from the first light emitting element 12a and the second light emitting element 12b. More specifically, the third light emitting element 12c has the central optical axis 121c facing the corner portion 10Rc of the detection region 10R, and the fourth light emitting element 12d has an angle with the center position 10Ro of the detection region 10R interposed therebetween. The central optical axis 121d is directed to the corner portion 10Rd opposite to the portion 10Rc.

  In the projection display device 100 with a position detection function of the present embodiment, the position detection light L2 emitted from the light emitting element 12 forms an intensity distribution of the position detection light L2 in the detection region 10R to detect the position of the target object Ob. For this reason, it is preferable that the intensity level of the intensity distribution formed in the detection region 10R is high. Therefore, in this embodiment, each of the four light emitting elements 12 (the first light emitting element 12a, the second light emitting element 12b, the third light emitting element 12c, and the fourth light emitting element 12d) detects the position emitted from the light emitting element 12. Reflecting mirrors 13a to 13d are provided that guide position detection light, which is directed toward the outside of the detection region 10R, out of the light L2 into the detection region 10R. In this embodiment, the reflection mirrors 13a to 13d have a shape corresponding to the shape on the detection region 10R toward which the central optical axis of the light emitting element 12 is directed, and extend from the side position of the light emitting element 12 toward the emission direction of the position detection light L2. Exist. More specifically, the reflecting mirrors 13 a to 13 d include two reflecting surfaces parallel to the central optical axis in two directions orthogonal to each other among the four directions surrounding the central optical axis of the light emitting element 12.

  In the projection display device 100 with the position detection function configured as described above, when the first light emitting element 12a is turned on, an intensity distribution is formed around the corner portion 10Ra of the detection region 10R as shown in FIG. The Further, when the second light emitting element 12b is turned on, an intensity distribution centering on the corner portion 10Rb of the detection region 10R is formed as shown in FIG. 5B. Further, when the third light emitting element 12c is turned on, an intensity distribution centering on the corner portion 10Rc of the detection region 10R is formed as shown in FIG. Further, when the fourth light emitting element 12d is turned on, an intensity distribution centering on the corner portion 10Rd of the detection region 10R is formed as shown in FIG.

  Therefore, for example, when the first light emitting element 12a and the fourth light emitting element 12d are turned on, as shown in FIG. 4A and FIG. 5E, the position is from the one side X1 in the X-axis direction toward the other side X2. A first intensity distribution L2Xa for X coordinate detection in which the intensity of the detection light monotonously decreases is formed. On the other hand, when the second light emitting element 12b and the third light emitting element 12c are turned on, as shown in FIGS. 4A and 5F, the other side X2 in the X-axis direction is directed toward the one side X1. An X coordinate detection second intensity distribution L2Xb in which the intensity of the position detection light monotonously decreases is formed.

  Further, as will be described later with reference to FIG. 7E, when all the four light emitting elements 12 (the first light emitting element 12a, the second light emitting element 12b, the third light emitting element 12c, and the fourth light emitting element 12d) are turned on. In the Z axis direction, a Z coordinate detection intensity distribution is formed in which the intensity of the position detection light monotonously decreases from the image projection apparatus 200 toward the screen 290.

(Basic principle of coordinate detection)
In the projection display device 100 with a position detection function according to the present embodiment, the data processing unit 50 uses the intensity distribution of the position detection light described with reference to FIGS. 4 and 5 to detect the target object in the detection region 10R. The position of Ob is detected. Therefore, the configuration of the light intensity distribution and the principle of coordinate detection will be described with reference to FIG.

  FIG. 6 is an explanatory diagram showing the intensity distribution of the position detection light used in the projection display device 100 with a position detection function to which the present invention is applied and the processing contents in the data processing unit 50. FIG. b) and (c) are explanatory diagrams showing the intensity distribution of the position detection light in the X-axis direction, explanatory diagrams showing the intensity of the position detection light reflected by the target object, and the intensity of the position detection light reflected by the target object being equal. It is explanatory drawing which shows a mode that the intensity distribution of position detection light is adjusted so that it may become.

  In the projection display device with a position detection function 100 according to this embodiment, when the position detection light L2 is emitted from the position detection light source unit 11, the distance of the position detection light source unit 11 from the light emitting element 12 and the position of the central optical axis thereof. As a result, an intensity distribution of the position detection light L2 is formed in the detection region 10R. For example, when detecting the X coordinate, as shown in FIGS. 6A and 6B, first, in the first period for X coordinate detection, from one side X1 in the X axis direction toward the other side X2. After forming the first intensity distribution L2Xa for X coordinate detection whose intensity decreases monotonically, the intensity decreases monotonously from the other side X2 in the X axis direction toward the one side X1 in the second period for X coordinate detection. A second intensity distribution L2Xb for detecting X coordinates is formed. Preferably, in the first period for X coordinate detection, after forming the first intensity distribution L2Xa for X coordinate detection in which the intensity decreases linearly from one side X1 in the X-axis direction to the other side X2, X In the second coordinate detection period, an X coordinate detection second intensity distribution L2Xb is formed in which the intensity decreases linearly from the other side X2 in the X-axis direction toward the one side X1. Therefore, when the target object Ob is arranged in the detection region 10R, the position detection light L2 is reflected by the target object Ob, and a part of the reflected light is detected by the photodetector 30. Here, the X coordinate detection first intensity distribution L2Xa formed in the first X coordinate detection period and the X coordinate detection second intensity distribution L2Xb formed in the second X coordinate detection period are set as distributions set in advance. Then, the X coordinate of the target object Ob can be detected based on the detection result of the photodetector 30 by the following method or the like.

  For example, in the first method, the difference between the X coordinate detection first intensity distribution L2Xa shown in FIG. 6B and the X coordinate detection second intensity distribution L2Xb is used. More specifically, since the first intensity distribution L2Xa for X coordinate detection and the second intensity distribution L2Xb for X coordinate detection are set in advance, the first intensity distribution L2Xa for X coordinate detection and the X coordinate are set. The difference from the detection second intensity distribution L2Xb is also a function set in advance. Therefore, the detection value LXa at the photodetector 30 when the first X coordinate detection intensity distribution L2Xa is formed in the first X coordinate detection period and the second intensity for X coordinate detection in the second period for X coordinate detection. The X coordinate of the target object Ob can be detected by obtaining the difference from the detection value LXb at the photodetector 30 when the distribution L2Xb is formed. According to this method, even when ambient light other than the position detection light L2, for example, an infrared component included in external light is incident on the light detector 30, when obtaining the difference between the detection values LXa and LXb, Since the intensity of the included infrared component is offset, the infrared component included in the ambient light does not affect the detection accuracy.

  Next, in the second method, the detection value LXa at the photodetector 30 when the first intensity distribution L2Xa for X coordinate detection is formed in the first period for X coordinate detection, and the second period for X coordinate detection. Based on the adjustment amount when the control amount (drive current) for the light emitting element 12 is adjusted so that the detection value LXb at the photodetector 30 when the second intensity distribution L2Xb for X coordinate detection is formed becomes equal. This is a method of detecting the X coordinate of the target object Ob. This method can be applied when the X coordinate detection first intensity distribution L2Xa and the X coordinate detection second intensity distribution L2Xb shown in FIG. 6B change linearly with respect to the X coordinate.

  First, as shown in FIG. 6 (b), the X coordinate detection first intensity distribution L2Xa and the X coordinate detection second intensity distribution L2Xb are absolute values in the first X coordinate detection period and the second X coordinate detection period. Are formed in the opposite direction in the X-axis direction. In this state, if the detection value LXa at the photodetector 30 in the first period for X coordinate detection is equal to the detection value LXb at the photodetector 30 in the second period for X coordinate detection, the target object Ob is X It can be seen that it is located in the axial center.

  On the other hand, when the detection value LXa at the photodetector 30 in the first period for X coordinate detection is different from the detection value LXb at the photodetector 30 in the second period for X coordinate detection, detection is performed. The control amount (driving current) for the light emitting element 12 is adjusted so that the values LXa and LXb are equal, and as shown in FIG. 6C, the X coordinate detection first time is again detected in the first X coordinate detection period. The first intensity distribution L2Xa is formed, and the second intensity distribution L2Xb for X coordinate detection is formed in the second period for X coordinate detection. As a result, if the detection value LXa at the photodetector 30 in the first X coordinate detection period and the detection value LXb at the photodetector 30 in the second X coordinate detection period are equal, the X coordinate detection second period is detected. The X coordinate of the target object Ob is determined by the ratio or difference between the control amount adjustment amount ΔLXa for the light emitting element 12 in one period and the control amount adjustment amount ΔLXb for the light emitting element 12 in the second period for X coordinate detection. Can be detected. According to such a method, even when ambient light other than the position detection light L2, for example, an infrared component included in external light is incident on the photodetector 30, the detection values LXa and LXb are equalized with respect to the light emitting element 12. When the control amount is adjusted, the intensity of the infrared component included in the ambient light is canceled out, so that the infrared component included in the ambient light does not affect the detection accuracy.

  Next, also in the third method, similarly to the second method, the detection value LXa at the photodetector 30 when the first intensity distribution L2Xa for X coordinate detection is formed in the first period for X coordinate detection, and X The control amount (drive current) for the light emitting element 12 was adjusted so that the detection value LXb at the photodetector 30 when the second intensity distribution L2Xb for X coordinate detection was formed in the second period for coordinate detection was equal. This is a method of detecting the X coordinate of the target object Ob based on the adjustment amount at the time. This method can be applied when the X coordinate detection first intensity distribution L2Xa and the X coordinate detection second intensity distribution L2Xb shown in FIG. 6B change linearly with respect to the X coordinate.

  First, as shown in FIG. 6 (b), the X coordinate detection first intensity distribution L2Xa and the X coordinate detection second intensity distribution L2Xb are absolute values in the first X coordinate detection period and the second X coordinate detection period. Are formed in the opposite direction in the X-axis direction. In this state, if the detection value LXa at the photodetector 30 in the first period for X coordinate detection is equal to the detection value LXb at the photodetector 30 in the second period for X coordinate detection, the target object Ob is X It can be seen that it is located in the axial center.

  On the other hand, when the detection value LXa at the photodetector 30 in the first period for X coordinate detection is different from the detection value LXb at the photodetector 30 in the second period for X coordinate detection, detection is performed. For example, by adjusting the control amount (drive current) for the light emitting element 12 in the period where the detection value is low or the detection value is high so that the values LXa and LXb are equal, A first intensity distribution L2Xa for X coordinate detection is formed in the first period, and a second intensity distribution L2Xb for X coordinate detection is formed in the second period for X coordinate detection. In the example illustrated in FIG. 6B, for example, the control amount for the light emitting element 12 in the first period for X coordinate detection is decreased by the adjustment amount ΔLXa. Alternatively, the control amount for the light emitting element 12 in the second period for X coordinate detection is increased by the adjustment amount ΔLXb. As a result, the control amount is adjusted if the detection value LXa at the photodetector 30 in the first period for X coordinate detection is equal to the detection value LXb at the photodetector 30 in the second period for X coordinate detection. Depending on the ratio or difference between the control amount for the light emitting element 12 in the later X coordinate detection first period and the control amount for the light emitting element 12 in the second period of X coordinate detection after adjusting the control amount The X coordinate of the object Ob can be detected. According to such a method, even when ambient light other than the position detection light L2, for example, an infrared component included in external light is incident on the photodetector 30, the detection values LXa and LXb are equalized with respect to the light emitting element 12. When the control amount is adjusted, the intensity of the infrared component included in the ambient light is canceled out, so that the infrared component included in the ambient light does not affect the detection accuracy.

  In the case where any of the above methods 1 to 3 is adopted, similarly, in the first period for Y coordinate detection, the Y coordinate detection in which the intensity monotonously decreases from one side Y1 in the Y axis direction toward the other side Y2. After the first intensity distribution is formed, the second intensity distribution for Y coordinate detection in which the intensity monotonously decreases from the other side Y2 in the Y-axis direction toward the one side Y1 in the second period for Y coordinate detection is formed. Then, the Y coordinate of the target object Ob can be detected. Further, if the intensity distribution in the Z-axis direction is formed in the Z coordinate detection period, the Z coordinate of the target object Ob can be detected.

  As described above, when acquiring the position information in the detection area 10R of the target object Ob based on the detection result of the photodetector 30, for example, a microprocessor unit (MPU) is used as the data processing unit 50, thereby A configuration in which processing is performed according to execution of predetermined software (operation program) can be employed. In addition, a configuration in which processing is performed by a signal processing unit using hardware such as a logic circuit may be employed.

(X coordinate detection operation)
With reference to FIG. 7, an operation of detecting the position of the target object Ob in the detection area 10 </ b> R in the projection display device 100 with a position detection function of the present embodiment will be described. FIG. 7 is an explanatory diagram showing the intensity distribution of position detection light formed by the projection display device 100 with a position detection function to which the present invention is applied. FIGS. 7A and 7B are views of the target object Ob. FIGS. 7C and 7D are explanatory diagrams of the intensity distribution for detecting the Y coordinate when detecting the Y coordinate of the target object Ob. FIGS. It is.

  In the projection display device 100 with a position detection function of this embodiment, in order to detect the XY coordinates of the target object Ob in the detection region 10R, the first period for X coordinate detection and the second period for X coordinate detection described below. Is used to detect the X coordinate, and the Y coordinate is detected in the first period for Y coordinate detection and the second period for Y coordinate detection. Furthermore, in the projection type display device 100 with a position detection function of this embodiment, the Z coordinate is detected by the Z coordinate detection period. Here, each time from the first X coordinate detection period to the Z coordinate detection period is, for example, about several milliseconds.

  To detect the X coordinate of the target object Ob in the detection region 10R in the projection display device 100 with a position detection function of the present embodiment, first, in the first period for X coordinate detection, as shown in FIG. First, the first light emitting element 12a and the fourth light emitting element 12d are turned on, and the second light emitting element 12b and the third light emitting element 12c are turned off. As a result, an X coordinate detection first intensity distribution L2Xa in which the intensity of the position detection light monotonously decreases from one side X1 in the X-axis direction toward the other side X2 is formed. In the first intensity distribution L2Xa for X coordinate detection of the present embodiment, the intensity of the position detection light continuously decreases linearly from one side X1 in the X-axis direction toward the other side X2. In the first intensity distribution for X coordinate detection L2Xa, the position in the X-axis direction and the intensity of the position detection light have a certain relationship. For this reason, the amount of light reflected by the target object Ob and detected by the photodetector 30 is proportional to the intensity of the position detection light in the first intensity distribution L2Xa for X coordinate detection, and is a value defined by the position of the target object Ob. It is.

  Next, in the second period for X coordinate detection, as shown in FIG. 7B, the first light emitting element 12a and the fourth light emitting element 12d are turned off, and the second light emitting element 12b and the third light emitting element 12c are turned off. Light up. As a result, an X coordinate detection second intensity distribution L2Xb in which the intensity of the position detection light monotonously decreases from the other side X2 in the X-axis direction toward the one side X1 is formed. In the second intensity distribution L2Xb for X coordinate detection of this embodiment, the intensity of the position detection light continuously decreases linearly from the other side X2 in the X-axis direction toward the one side X1. In the second intensity distribution for X-coordinate detection L2Xb, the position in the X-axis direction and the intensity of the position detection light have a certain relationship, like the first intensity distribution for X-coordinate detection L2Xa. For this reason, the amount of light reflected by the target object Ob and detected by the photodetector 30 is proportional to the intensity of the position detection light in the X coordinate detection second intensity distribution L2Xb, and is a value defined by the position of the target object Ob. It is.

  Therefore, the difference or ratio between the light amount detected by the photodetector 30 in the first period for X coordinate detection and the light amount detected by the photodetector 30 in the second period for X coordinate detection is the position of the target object Ob. Is a value defined by. Therefore, the X coordinate detection unit 53 of the data processing unit 50 determines the detection result of the photodetector 30 in the first period for X coordinate detection and the detection result of the photodetector 30 in the second period for X coordinate detection. Based on this, the X coordinate of the target object Ob can be detected.

(Y coordinate detection operation)
To detect the Y coordinate of the target object Ob in the detection region 10R in the projection display device 100 with a position detection function of the present embodiment, first, in the first period for Y coordinate detection, as shown in FIG. In addition, the second light emitting element 12b and the fourth light emitting element 12d are turned on, and the first light emitting element 12a and the third light emitting element 12c are turned off. As a result, a Y coordinate detection first intensity distribution L2Ya in which the intensity of the position detection light monotonously decreases from one side Y1 in the Y-axis direction toward the other side Y2 is formed. In the first intensity distribution L2Ya for Y coordinate detection of this embodiment, the intensity of the position detection light continuously decreases linearly from one side Y1 in the Y direction toward the other side Y2. In the first intensity distribution L2Ya for Y coordinate detection, the position in the Y-axis direction and the intensity of the position detection light have a certain relationship. For this reason, the amount of light reflected by the target object Ob and detected by the light detector 30 is proportional to the intensity of the position detection light in the first intensity distribution L2Ya for Y coordinate detection, and is a value defined by the position of the target object Ob. It is.

  Next, in the second period for Y coordinate detection, as shown in FIG. 7D, the second light emitting element 12b and the fourth light emitting element 12d are turned off, and the first light emitting element 12a and the third light emitting element 12c are turned off. Light up. As a result, a second intensity distribution L2Yb for Y coordinate detection in which the intensity of the position detection light monotonously decreases from the other side Y2 in the Y-axis direction toward the one side Y1 is formed. In the second intensity distribution L2Yb for Y coordinate detection of this embodiment, the intensity of the position detection light continuously decreases linearly from the other side Y2 in the Y-axis direction toward the one side Y1. In the second intensity distribution L2Yb for Y coordinate detection, as in the first intensity distribution L2Ya for Y coordinate detection, the position in the Y-axis direction and the intensity of the position detection light have a certain relationship. For this reason, the amount of light reflected by the target object Ob and detected by the photodetector 30 is proportional to the intensity of the position detection light in the Y coordinate detection second intensity distribution L2Yb, and is a value defined by the position of the target object Ob. It is.

  Therefore, the difference or ratio between the light amount detected by the photodetector 30 in the first period for Y coordinate detection and the light amount detected by the photodetector 30 in the second period for Y coordinate detection is the position of the target object Ob. Is a value defined by. Therefore, the Y coordinate detection unit 54 of the data processing unit 50 determines the detection result of the photodetector 30 in the first period for Y coordinate detection and the detection result of the photodetector 30 in the second period for Y coordinate detection. Based on this, the Y coordinate of the target object Ob can be detected.

(Z coordinate detection operation)
In the projection display device 100 with a position detection function of this embodiment, in order to detect the Z coordinate of the target object Ob in the detection region 10R, as shown in FIG. All of the element 12a, the second light emitting element 12b, the third light emitting element 12c, and the fourth light emitting element 12d are turned on. As a result, a Z coordinate detection intensity distribution L2Z in which the intensity of the position detection light monotonously decreases toward the screen 290 from the side where the image projection apparatus 200 is positioned in the Z-axis direction is formed. In such a Z-coordinate detection intensity distribution L2Z, the position in the Z-axis direction and the intensity of the position detection light have a certain relationship. For this reason, the amount of light reflected by the target object Ob and detected by the photodetector 30 is proportional to the intensity of the position detection light in the Z coordinate detection intensity distribution L2Z and is a value defined by the position of the target object Ob. . Therefore, the Z coordinate detection unit 55 of the data processing unit 50 can detect the Z coordinate of the target object Ob based on the detection result of the photodetector 30 in the Z coordinate detection period.

(Each mode of the projection display device 100 with a position detection function)
3, in the projection display device 100 with a position detection function according to this embodiment, the data processing unit 50 includes a mode determination unit 56, a safe mode execution unit 571, a display condition change unit 572, an XY in addition to the position detection unit 51. A coordinate determination unit 573 and an approach information generation unit 574 are provided. That is, in the projection display device with a position detection function 100 according to the present embodiment, the following modes are executed depending on which position from the image projection device 200 to the screen 290 the target object Ob exists.

First, the mode determination unit 56 determines that the position (Z coordinate) of the target object Ob from the image projection apparatus 200 is expressed by the following formula: Z ≦ Zcr
When it is determined that the distance is within the set close distance Zcr, the safe mode execution unit 571 is instructed to decrease the brightness of the projection light source of the image projection apparatus 200 and the brightness of the display light projected from the image projection apparatus 200 as shown in FIG. The image projection apparatus 200 is caused to perform a safe mode for reducing the image quality. For this reason, even when a person looks into the projection lens 210 of the image projection apparatus 200, the brightness of the display light is reduced, so that the eyes can be prevented from being damaged. In this embodiment, the set closest distance Zcr is set to 20 cm.

Further, the mode determination unit 56 determines that the position (Z coordinate) of the target object Ob from the image projection device 200 is expressed by the following formula: Zmin ≦ Z ≦ Zmax
As shown in FIG. 4, when the X and Y coordinates are within the set range for determining the XY coordinates (Zmin to Zmax), the X and Y coordinates detecting unit 54 detects the X and Y coordinates detected by the X coordinate detecting unit 53. The image projection apparatus 200 is caused to perform a Y coordinate determination mode in which the Y coordinate is determined as the XY coordinates of the target object Ob. Therefore, since a certain range in the projection direction of the display light can be set as the XY coordinate determination setting range, for example, the target object Ob exists in the certain effective range Zp from the screen 290 toward the image projection apparatus 200. Sometimes, the XY coordinates of the target object Ob are handled as input information. However, when a person passes in front of the image display device 200, the presence of the target object Ob is not regarded as input, and thus erroneous input or the like can be prevented. it can. In this embodiment, the effective range Zp is set to 5 cm. In this embodiment, first, the effective range Zp is set in advance, and then the distance from the image projection apparatus 200 to the screen 290 is set as the maximum value Zmax. Thereafter, the following formula Zmin = Zmax− Zp
Thus, the minimum value Zmin is set.

  In addition, the mode determination unit 56 determines that the position (Z coordinate) of the target object Ob from the image projection apparatus 200 is out of both the set close distance and the set range for determining the XY coordinate, and the X coordinate and When both of the Y coordinates are detected, the image projection apparatus 200 is instructed to enter the entry information generation unit 574 to cause the image projection apparatus 200 to perform an entry information generation mode for generating entry information indicating that the target object Ob has entered the detection region 10R. . Therefore, since it can be predicted in advance that the target object Ob enters the detection area 10R and input in the near future, the preparation can be performed. Further, when a person passes in front of the image display apparatus 200, it is possible to quickly determine that the presence of the target object Ob is not regarded as an input. In this embodiment, the approach information generation unit 574 outputs the X coordinate detected by the X coordinate detection unit 53 and the Y coordinate detected by the Y coordinate detection unit 54 as provisional coordinates as the approach information generation mode. Therefore, since the image projection apparatus 200 can predict in advance what kind of input will be performed, it can prepare for the next operation.

  Furthermore, when both the X coordinate and the Y coordinate are not detected even when the Z coordinate is detected, the mode determination unit 56 instructs the display condition changing unit 572 to perform an image on the image projection apparatus 200 based on the Z coordinate. The image projection apparatus 200 is caused to perform a display condition change mode for changing the display condition. That is, when both the X coordinate and the Y coordinate are not detected even when the Z coordinate is detected, the Z coordinate can be determined as the position of the screen 290. Therefore, since the distance between the image projection apparatus 200 and the screen 290 is known, the brightness adjustment of the display light, the image adjustment, and the like can be automatically performed according to the distance.

  The mode determination unit 56, the safe mode execution unit 571, the display condition change unit 572, the XY coordinate determination unit 573, and the entry information generation unit 574 can be configured by hardware such as a logic circuit. In this embodiment, the mode determination unit 56, the safe mode execution unit 571, the display condition change unit 572, the XY coordinate determination unit 573, and the approach information generation unit 574 execute software (operation program) shown in FIG. 8 from the microprocessor unit. It is constituted by.

(Mode decision processing example)
FIG. 8 is a flowchart showing a processing example for determining a mode in the projection display device 100 with a position detection function to which the present invention is applied.

In this embodiment, after the projection type display device 100 with a position detection function and the screen 290 are arranged, display conditions are initially set. Specifically, an image is projected from the image projection apparatus 200 toward the screen 290, and the position detection light L2 is emitted from the position detection light source unit 11 to detect the Z coordinate of the target object Ob. At the time of such initial setting, since no person or the like exists in the detection area 10R, the screen 290 becomes the target object Ob. Therefore, in this case, the X coordinate and the Y coordinate cannot be detected. The Z coordinate detected in this way is set as the maximum value Zmax. As a result, the following formula Zmin = Zmax−Zp
Thus, the minimum value Zmin is automatically set. Further, the Z coordinate obtained at the time of the initial setting corresponds to the distance between the image projection apparatus 200 and the screen 290, and accordingly, the brightness adjustment of the display light, the image adjustment, and the like are performed according to the distance.

Thereafter, the following processing is performed while projecting an image from the image projection apparatus 200 toward the screen 290 and emitting the position detection light L2 from the position detection light source unit 11. First, in step ST1, the Z coordinate of the target object Ob is detected by the Z coordinate detector 55. Next, in step ST2, the mode determination unit 56 determines that the Z coordinate of the target object Ob is expressed by the following formula: Z ≦ Zcr
It is determined whether or not the above is satisfied.

  As a result, if the above equation is satisfied, in step ST3, the mode determination unit 56 instructs the safe mode execution unit 571 to assume that there is a person near the image projection device 200, and decreases the luminance of the projection light source. To reduce the luminance of the display light.

When it is determined in step ST2 that the above equation is not satisfied, the mode determination unit 56 determines in step ST4 that the following equation Zmin ≦ Z ≦ Zmax
It is determined whether or not the above is satisfied.

  As a result, if the above equation is satisfied, in step ST5, the mode determination unit 56 causes the X coordinate detection unit 53 and the Y coordinate detection unit 54 to detect the X coordinate of the target object Ob and the X coordinate of the target object Ob. Next, in step ST6, the mode determination unit 56 determines whether or not the X coordinate and the Y coordinate are detected. In this determination, if the X coordinate and the Y coordinate are detected, in step ST7, the mode determination unit 56 instructs the XY coordinate determination unit 573 to detect the X coordinate and the Y coordinate detected by the X coordinate detection unit 53. The image projection apparatus 200 is caused to perform a Y coordinate determination mode in which the Y coordinate detected by the detection unit 54 is determined as the XY coordinate of the target object Ob. As a result, in the projection display device 100 with a position detection function, the image is switched based on the XY coordinates (input information) of the target object Ob.

In step ST6, when the X coordinate and the Y coordinate are not detected, the screen 290 is the target object Ob. Therefore, since the Z coordinate corresponds to the distance between the image projection apparatus 200 and the screen 290, the mode determination unit 56 instructs the display condition changing unit 572 in step ST8, and displays light according to the distance. Make brightness adjustments and image adjustments. Therefore, even when the position of the image projection apparatus 200 or the screen 290 is changed after the initial setting, the brightness of the display light and the image can be adjusted to the optimum conditions. Further, the Z coordinate obtained this time is set as the maximum value Zmax, and again, the following formula Zmin = Zmax−Zp
Thus, the minimum value Zmin is automatically set. Therefore, even when the positions of the image projection device 200 and the screen 290 are changed, the optimum range can be set as the effective range Zp.

On the other hand, in step ST4, the following formula Zmin ≦ Z ≦ Zmax
If not satisfied, the mode determination unit 56 causes the X coordinate detection unit 53 and the Y coordinate detection unit 54 to detect the X coordinate of the target object Ob and the X coordinate of the target object Ob in step ST9. Next, in step ST10, the mode determination unit 56 determines whether or not the X coordinate and the Y coordinate are detected. In this determination, when the X coordinate and the Y coordinate are detected, the mode determination unit 56 instructs the entry information generation unit 574 in step ST11 to indicate that the target object Ob has entered the detection region 10R. Generate entry information. At that time, the approach information generation unit 574 outputs the X coordinate detected by the X coordinate detection unit 53 and the Y coordinate detected by the Y coordinate detection unit 54 as provisional coordinates as the approach information generation mode. Therefore, the image projection apparatus 200 can predict in advance what kind of input will be performed.

  If the X coordinate and the Y coordinate are not detected in step ST11, the process returns to step ST1 and the above processing is repeated.

(Main effects of this form)
As described above, in the present embodiment, when the projection display device 100 with a position detection function is configured by adding a position detection function to the projection display device, a position formed of infrared light toward the detection region 10R. A position detection light source unit 11 that emits detection light is provided, and the position detection light reflected by the target object Ob in the detection region 10 </ b> R is detected by the photodetector 30. Here, since the position detection light emitted from the position detection light source unit 11 forms an intensity distribution in the detection region 10R, the relationship between the position in the detection region 10R and the intensity of the position detection light can be grasped in advance. For example, the data processing unit 50 can detect the XYZ coordinates of the target object Ob based on the light reception result of the photodetector 30.

  The position detection light source unit 11 is provided in the image projection apparatus 200 and emits position detection light from the image projection apparatus 200 toward the detection region 10R. For this reason, it is not necessary to provide many light emitting elements 12 around the detection region 10R. Further, the position detection light source unit 11, the photodetector 30, and the data processing unit 50 are all provided in the image projection apparatus 200. For this reason, since all the elements necessary for position detection are provided in the image projection apparatus 200, it is convenient to carry, and if the orientation of the image projection apparatus 200 is adjusted, the optical axis direction of the photodetector 30 is adjusted. can do.

  Further, the position detection light source unit 11 emits the position detection light from the front surface part 201 where the projection lens 210 that projects an image in the image projection apparatus 200 is located. For this reason, the emission direction of the light for image display and the position detection light can be adjusted only by adjusting the direction in which the front surface portion 201 of the image projection apparatus 200 faces. Further, the light detector 30 is also provided on the front surface portion 201 of the image projection apparatus 200, as with the position detection light source unit 11. For this reason, the photodetector 30 can be reliably directed in the same direction as the image display light and the position detection light. Therefore, the emission direction of the image display light and the position detection light and the direction in which the optical axis center of the photodetector 30 faces can be adjusted only by adjusting the direction in which the front surface portion 201 of the image projection apparatus 200 faces. .

  Furthermore, in the projection display device with a position detection function 100 according to the present embodiment, the Z coordinate of the target object Ob is detected, and the mode determination unit 56 of the data processing unit 50 is different from the image projection device 200 based on the Z coordinate. To do. In the case of the projection type display device, there is a request to switch the operation of the image projection device 200 depending on which position in the projection direction the target object Ob exists. Since the coordinates are detected, such a request can be met.

[Other embodiments]
In the above-described embodiment, the intensity distribution of the position detection light L2 is formed in different directions by turning on / off the plurality of light emitting elements 12, but the position detection light is further combined with the balance of the light emission intensities of the plurality of light emitting elements 12. An intensity distribution of L2 may be formed.

10R ··· Detection area, 11 ··· Light source for position detection, 12 · · Light emitting element, 30 · · Photodetector, 50 · · Data processing unit, 51 · · Position detection unit, 52 · · Signal processing unit, 53 ..X coordinate detection unit, 54 ..Y coordinate detection unit, 55 ..Z coordinate detection unit, 56 ..Mode determination unit, 100 ..Projection type display device with position detection function, 200 ..Image projection device, 201 ..Front part 210 ..Projection lens 280 ..Optical device 290 ..Screen 571 ..Safe mode execution part 572 ..Display condition change part 573 ..XY coordinate determination part 574 ..Entry information Generator, Ob ... Target object

Claims (8)

A projection display device with a position detection function for projecting an image from an image projection device and optically detecting a position of a target object in a detection region set on a side on which the image is projected,
The image projection device emits position detection light composed of infrared light toward the detection area and forms an intensity distribution of the position detection light in the detection area; and A photodetector that detects the position detection light reflected by the target object; and a data processing unit that performs data processing of a light reception result of the photodetector;
When the projection direction of the image is the Z-axis direction and the two directions intersecting the projection direction of the image are the X-axis direction and the Y-axis direction,
The data processing unit includes an X coordinate detection unit that detects an X coordinate of the target object based on a detection result of the photodetector when the light source unit for position detection forms the intensity distribution in the X-axis direction; A Y-coordinate detection unit that detects a Y-coordinate of the target object based on a detection result of the photodetector when the light source unit for position detection forms the intensity distribution in the Y-axis direction, and the position detection A Z-coordinate detection unit that detects a Z-coordinate of the target object based on a detection result of the photodetector when the light source unit forms the intensity distribution in the Z-axis direction. Projection type display device with position detection function.   The projection display device with a position detection function according to claim 1, wherein the data processing unit includes a mode determination unit that causes the image projection device to perform different modes based on the Z coordinate.   When the mode determination unit determines that the distance of the target object from the image projection apparatus is within a set closest distance based on the Z coordinate, the mode determination unit decreases the luminance of the display light projected from the image projection apparatus. The projection display device with a position detection function according to claim 2, wherein the image projection device performs a safe mode.   When the Z coordinate is within the XY coordinate determination setting range, the mode determination unit uses the X coordinate detected by the X coordinate detection unit and the Y coordinate detected by the Y coordinate detection unit as the XY coordinates of the target object. The projection display device with a position detection function according to claim 2 or 3, wherein the image projection device is made to perform an XY coordinate determination mode to be determined.   The mode determination unit is configured such that the Z coordinate is out of both the set close distance and the set range for XY coordinate determination, and the X coordinate and the Y coordinate are both the target object from the image projection apparatus. 5. The image projection apparatus is made to perform an entry information generation mode for generating entry information indicating that the target object has entered the detection area when an object is detected. A projection display device with a position detection function according to the item.   The mode determination unit changes a display condition to change an image display condition in the image projection device based on the Z coordinate when both the X coordinate and the Y coordinate are not detected even when the Z coordinate is detected. The projection display device with a position detection function according to claim 2, wherein the image projection device is caused to perform a mode.   The said position detection light source part radiate | emits the said position detection light from the front part in which the projection lens which projects the said image in the said image projector is located, The Claim 1 thru | or 6 characterized by the above-mentioned. Projection type display device with position detection function.   The projection display device with a position detection function according to claim 7, wherein the photodetector is provided on the front portion of the image projection device.