JP2018159835A - Projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection device capable of acquiring information on an external environment in a wider range than a screen and controlling a light source device based on the information. A projection device (10) includes a light source device (60), a display element (51) that modulates a light source light from the light source device (60) to form a projected image, and a projection lens (220A) on which the projected image is incident and emits the projected light. An image pickup element 49 in which the display element 51 is arranged so as to be able to take an image, and a control unit 38 for controlling the display element 51, the light source device 60, and the image pickup element 49 are provided. Then, the control unit 38 determines the presence or absence of an object in the region outside the projected image captured by the image sensor 49, and if it is determined that the object exists in the region outside the projected image, the control unit 38 changes the projection condition of the projected light. To do. [Selection diagram] Fig. 3

Description

  The present invention relates to a projection apparatus.

  2. Description of the Related Art Today, data projectors are widely used as image projection apparatuses that project a screen of a personal computer, a video image, an image based on image data stored in a memory card or the like onto a screen. This projector focuses light emitted from a light source on a micromirror display element called DMD (digital micromirror device) or a liquid crystal plate to display a color image on a screen.

  Projectors that are projection devices have been used for a wide range of applications from business presentations to home use with the spread of video equipment such as personal computers and DVD players. For example, Patent Documents 1 and 2 disclose a projection apparatus that detects a user's operation in a projection area on a screen and performs a point instruction on a projection image using a laser pointer.

  Specifically, Patent Document 1 discloses a projection apparatus including a light source capable of emitting light source light and infrared light of projection light, an image sensor having sensitivity to infrared light, and a position detection unit. Has been. In the projection apparatus described in Patent Document 1, an image of an object illuminated with infrared light emitted from a light source is captured by an image sensor, and based on the captured reflected image, the position detection unit determines the user's operation position on the screen. It comes to detect.

  On the other hand, in the projection apparatus described in Patent Document 2, the external light pointed to the screen by the laser pointer is detected by the optical sensor unit, and the pointed position in the detected external light is recognized. .

JP, 2006-57363, A Japanese Patent Laying-Open No. 2015-158644

  In the projection apparatus shown in Patent Document 1 described above, since the position detection unit detects the user's operation position on the screen based on the captured reflection image, the region of the reflection image and the projection image can be recognized. It was difficult. For example, since a reflected image is displayed brightly in a bright room, the detection of the range of the reflected image tends to be ambiguous, and it is difficult to detect the user's operation position. In addition, since the optical path between the projection device and the image sensor cannot be seen, the boundary between the captured image and the reflected image becomes ambiguous, making it difficult to perform image analysis.

  On the other hand, unlike the patent document 1, the projection apparatus disclosed in Patent Document 2 acquires screen information via the projection optical system and the display element without using a dedicated optical system such as a photographing lens or a photographing element. Yes. However, since the information that can be acquired through the projection optical system and the display element is information related to the irradiation position of the laser pointer in the projected image, the use of the information is limited.

  An object of the present invention is to provide a projection device that can acquire information on a wide range of external environments and control a light source device based on the information.

  A projection device according to the present invention includes a light source device, a display element that modulates light source light from the light source device to form a projection image, a projection lens that receives the projection image and emits projection light, and the display An image sensor disposed so as to be capable of capturing an image; and a control unit that controls the display element, the light source device, and the image sensor, wherein the control unit is an area outside the projected image captured by the image sensor. The presence or absence of the target object is determined, and when it is determined that the target object exists in the region outside the projection image, the projection condition of the projection light is changed.

  ADVANTAGE OF THE INVENTION According to this invention, the information of the external environment of the range wider than the range projected on a screen can be acquired, and a light source device can be controlled based on the information.

It is an external appearance perspective view which shows the projector which concerns on embodiment of this invention. It is a figure which shows the functional block of the projection apparatus which concerns on embodiment of this invention. It is a plane schematic diagram which shows the internal structure of the projection apparatus which concerns on embodiment of this invention. The state of the display element in the projector which concerns on embodiment of this invention is shown, (a) is a schematic diagram which shows the state which controls a display element and projects a projection image on a screen, (b). FIG. 6 is a schematic diagram showing a state in which the display element is controlled and the screen and its periphery are imaged by the imaging element via the projection lens. It is a front schematic diagram of the display element concerning the embodiment of the present invention, and is a schematic diagram showing the effective part field and effective part outside field provided on the image formation side of a display element. It is the conceptual diagram which showed the example which the control part which concerns on embodiment of this invention determines that the person outside the projection range of a screen is reflected in the effective outside area | region of a display element, and there exists a person. It is a timing chart which shows operation | movement of the mirror of the projector which concerns on embodiment of this invention, (a) is a figure which shows the example which radiate | emits white light in the ON state of a display element. (B) is a figure which shows the example in which light source light injects into a mirror in a display element being an OFF state. (C) is a figure which shows the example in which light source light is not incident on a mirror, when a display element is an OFF state. The flowchart which showed the process which a control part controls the emitted light of a light source device, when the projection apparatus which concerns on 1st Embodiment of this invention projects the projection image formed with the display element on a screen by a time division drive. It is. FIG. 6 is a flowchart illustrating a process in which a control unit halves light from a light source device as a modification of the projection device according to the first embodiment of the present invention. It is a block diagram which shows the structure which connects an information processing apparatus to a projection apparatus, and projects and displays a projection image on a screen as a specific example of the projection apparatus which concerns on 2nd Embodiment of this invention. It is the figure which showed the modification of the image formation surface of the display element which concerns on embodiment of this invention.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of the projection apparatus 10. In the following description, left and right in the projection device 10 indicate the left and right direction with respect to the projection direction, and front and rear indicate the screen side direction of the projection device 10 and the front and rear direction with respect to the traveling direction of the light beam.

  As shown in FIG. 1, the projection device 10 has a substantially rectangular parallelepiped shape, and has a lens cover 19 that covers the projection port on the side of the front panel 12 that is a side plate in front of the housing of the projection device 10. At the same time, the front panel 12 is provided with a plurality of exhaust holes 17. Further, although not shown, an Ir receiver for receiving a control signal from the remote controller is provided.

  Further, a key / indicator unit 37 is provided on the top panel 11 of the casing, and the key / indicator unit 37 switches a power switch key, a power indicator for notifying power on / off, and switching on / off of projection. Keys and indicators such as an overheat indicator for notifying when a projection switch key, a light source device, a display element, a control circuit or the like is overheated are arranged.

  In addition, an input / output connector portion provided with a D-SUB terminal, an S terminal, an RCA terminal, an audio output terminal, and the like for inputting a video signal to which a USB terminal or an analog RGB video signal is input to the rear panel is provided on the rear surface of the housing; Various terminals (group) 20 such as a power adapter plug are provided. In addition, a plurality of intake holes are formed in the back panel. A plurality of exhaust holes 17 are formed in the right side panel, which is a side plate of the casing (not shown), and the left side panel 15 and the front panel 12, which are side plates shown in FIG. An intake hole 18 is also formed in the corner of the left panel 15 near the rear panel and the rear panel 13.

  Next, the projector control unit of the projector 10 will be described with reference to the functional block diagram of FIG. The projection device control unit includes a control unit 38, an input / output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, an image sensor 49, and the like.

  The control unit 38 controls the operation of each circuit in the projection apparatus 10, and includes a CPU, a ROM that stores operation programs such as various settings fixedly, and a RAM that is used as a work memory. ing.

  The image signal of various standards input from the input / output connector unit 21 by the projection device control unit is in a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus (SB). After being converted so as to be unified into the image signal, it is output to the display encoder 24.

  The display encoder 24 develops and stores the input image signal in the video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to the display driving unit 26.

  The display driving unit 26 functions as a display element control unit. The display driving unit 26 drives the display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal output from the display encoder 24. The display driving unit 26 irradiates the light beam emitted from the light source device 60 to the display element 51 using a DMD (digital micromirror device) through a light source side optical system described later, thereby displaying the display element 51. A projected image is formed by the reflected light of the projected light, and the projected image is projected and displayed on a screen (not shown) via the projection lens unit 220. Here, the surface on which the projected image is formed with the reflected light of the display element 51 is referred to as an image forming surface.

  The movable lens group 235 (see FIG. 3) of the projection lens unit 220 is driven by the lens motor 45 for zoom adjustment and focus adjustment. Further, the fixed lens group 225 and the movable lens group 235 included in the projection lens unit 220 of FIG. 3 to be described later are collectively referred to as a projection lens 220A.

  The image sensor 49 is arranged so as to be able to capture an image forming surface of the display element 51. External light incident from the projection port is reflected on the image forming surface. Therefore, the image sensor 49 can capture a scene in front of the projection port. Then, the control unit 38 captures an image forming surface of the display element 51 when the imaging element 49 is turned off, so that a wider range than the projected image projected on the screen when the display element 51 is turned on is obtained. The information of the effective outside area to be shown can be acquired.

  Here, the on state means a projection state in which the display element 51 forms a projection image on the image forming surface and projects the projection image onto the screen, while the off state means that the display element 51 displays the projection image. It means a state where it is not formed on the image forming surface. And the control part 38 is controlled to image a screen via the image formation surface of the display element 51 at the time of OFF. The state when the display element 51 is on and off will be described in detail with reference to FIG.

  The image compression / decompression unit 31 performs a recording process in which the luminance signal and the color difference signal of the image signal are data-compressed by a process such as ADCT and Huffman coding, and are sequentially written in a memory card 32 that is a detachable recording medium.

  Further, the image compression / decompression unit 31 reads the image data recorded on the memory card 32 in the reproduction mode, decompresses each image data constituting a series of moving images in units of one frame, and converts the image data into an image conversion Based on the image data that is output to the display encoder 24 via the unit 23 and stored in the memory card 32, a process for enabling display of a moving image or the like is performed.

  Then, an operation signal of the key / indicator unit 37 constituted by a main key and an indicator provided on the top panel 11 of the housing is directly output to the control unit 38. A key operation signal from the remote controller is received by the Ir receiver 35, and a code signal demodulated by the Ir processor 36 is output to the controller 38.

  An audio processing unit 47 is connected to the control unit 38 via a system bus (SB). The sound processing unit 47 includes a sound source circuit such as a PCM sound source, converts the sound data into analog in the projection mode and the playback mode, and drives the speaker 48 to emit loud sounds.

  In addition, the control unit 38 controls the display element 51 and the light source device 60. Specifically, the control unit 38 controls the display driving unit 26 as a display element control unit and the light source control circuit 41 as a light source control unit. The light source control circuit 41 performs individual light emission control at a predetermined timing from the excitation light source and the red light source device so that light of a predetermined wavelength band required at the time of image generation is emitted from the light source device 60, and red, green, and Emits light in the blue wavelength band.

  When the projection lens 220A emits projection light, the display driving unit 26 causes the light source light from the light source device 60 to enter the image forming surface, while when the image forming surface is imaged by the image sensor 49, the display driving unit 26 is an effective unit. The angles of the plurality of mirrors 51a in the effective area ER are switched so that the outer area is imaged. That is, the display driving unit 26 controls the tilt of the mirror 51a. Since the mirror 51a in the effective outside region OR is always in the off state, even if the mirror 51a in the effective region ER is in the on state, the effective outside region can be obtained by imaging with the image sensor 49. It is possible to detect whether or not there is a person HB in the OR.

  Furthermore, the control unit 38 has a function as a determination processing unit, and determines the presence / absence of an object in the effective outside region based on the image forming surface imaged by the imaging element 49. And when it determines with the control part 38 having a target object in an effective part outside area | region, the light source light from the light source device 60 is light-extinguished or dimmed. The effective area and the effective area will be described in detail with reference to FIG.

  Further, the control unit 38 causes the cooling fan drive control circuit 43 to perform temperature detection using a plurality of temperature sensors provided in the light source device 60 and the like, and controls the rotation speed of the cooling fan based on the temperature detection result. Further, the control unit 38 causes the cooling fan drive control circuit 43 to maintain the rotation of the cooling fan even after the projection apparatus 10 body is turned off by a timer or the like, or depending on the result of temperature detection by the temperature sensor, Control such as turning off the power is also performed.

  Next, the internal structure of the projection apparatus 10 will be described with reference to FIG. FIG. 3 is a schematic plan view showing the internal structure of the projection apparatus 10. The projection apparatus 10 includes a control circuit board 241 in the vicinity of the right panel 14. The control circuit board 241 includes a power circuit block, a light source control block, and the like. In addition, the projection device 10 includes a light source device 60 at the side of the control circuit board 241, that is, at a substantially central portion of the housing of the projection device 10. Further, the light source side optical system 170 and the projection lens unit 220 are disposed in the projection device 10 between the light source device 60 and the left panel 15.

  The light source device 60 includes an excitation light irradiation device 70 that is a blue wavelength band light source and an excitation light source, a red light source device 120 that is a red wavelength band light source, and a green light source device that is a green wavelength band light source. 80. The green light source device 80 includes an excitation light irradiation device 70 and a fluorescent plate device 100. In the light source device 60, a light guide optical system 140 that guides blue wavelength band light, green wavelength band light, and red wavelength band light is disposed. The light guide optical system 140 condenses each color wavelength band light emitted from each color light source device 70, 80, 120 at the entrance of the light tunnel 175.

  The excitation light irradiation device 70 is disposed in the vicinity of the rear panel 13 at a substantially central portion in the left-right direction of the projection device 10 housing. The excitation light irradiation device 70 includes a light source group including a blue laser diode 71, a reflection mirror group 75, a condenser lens 78, a heat sink 81, and the like. The light source group includes a blue laser diode 71 which is a plurality of semiconductor light emitting elements arranged so that the optical axis is parallel to the back panel 13. The reflection mirror group 75 converts the optical axis of the emitted light from each blue laser diode 71 by 90 degrees toward the front panel 12. The condensing lens 78 condenses the emitted light from each blue laser diode 71 reflected by the reflecting mirror group 75. The heat sink 81 is disposed between the blue laser diode 71 and the right panel 14.

  The light source group includes a plurality of blue laser diodes 71, which are semiconductor light emitting elements, arranged in a matrix. On the optical axis of each blue laser diode 71, a collimator lens 73 that converts each beam into parallel light is arranged so as to enhance the directivity of the emitted light from each blue laser diode 71. Further, the reflection mirror group 75 is formed by aligning a plurality of reflection mirrors in a stepped manner and integrated with the mirror substrate 76 to adjust the position, so that the cross-sectional area of the light beam emitted from the blue laser diode 71 is uniform. The image is reduced in the direction and emitted to the condenser lens 78.

  A cooling fan 261 is disposed between the heat sink 81 and the back panel 13, and the blue laser diode 71 is cooled by the cooling fan 261 and the heat sink 81. Further, a cooling fan 261 is disposed between the reflection mirror group 75 and the back panel 13, and the reflection mirror group 75 and the condenser lens 78 are cooled by the cooling fan 261.

  The red light source device 120 includes a red light source 121 arranged so that its optical axis is parallel to the blue laser diode 71, and a condensing lens group 125, which is an optical device that condenses the light emitted from the red light source 121. Provided. The red light source 121 is a red light emitting diode that is a semiconductor light emitting element that emits light in a red wavelength band. The red light source device 120 includes an optical axis of red wavelength band light emitted from the red light source device 120, an optical axis of blue wavelength band light emitted from the excitation light irradiation device 70, and a green wavelength band emitted from the fluorescent plate 101. It arrange | positions so that the optical axis of light may cross | intersect. Furthermore, the red light source device 120 includes a heat sink 130 disposed on the right panel 14 side of the red light source 121. A cooling fan 261 is disposed between the heat sink 130 and the front panel 12, and the red light source 121 is cooled by the cooling fan 261 and the heat sink 130.

  The fluorescent plate device 100 constituting the green light source device 80 is disposed on the optical path of the excitation light emitted from the excitation light irradiation device 70 and in the vicinity of the front panel 12. The fluorescent plate device 100 is a fluorescent plate 101 that is a fluorescent wheel arranged so as to be parallel to the front panel 12, that is, orthogonal to the optical axis of the emitted light from the excitation light irradiation device 70, and the fluorescent plate 101 is rotated. A driving motor 110 and a condensing lens group 111 that condenses the light bundle of excitation light emitted from the excitation light irradiation device 70 on the fluorescent plate 101 and condenses the light bundle emitted from the fluorescent plate 101 toward the rear panel 13. And a condensing lens 115 that condenses the light beam emitted from the fluorescent plate 101 toward the front panel 12. A cooling fan 261 is disposed between the motor 110 and the front panel 12, and the fluorescent plate device 100 and the like are cooled by the cooling fan 261.

  The fluorescent plate 101 includes a fluorescent emission region that receives the emission light from the excitation light irradiation device 70 via the condenser lens group 111 as excitation light and emits fluorescence of green wavelength band light, and the emission light from the excitation light irradiation device 70. A diffusion transmission region that transmits or diffuses and transmits certain excitation light is continuously arranged in the circumferential direction.

  The substrate of the fluorescent plate 101 is a metal substrate made of copper, aluminum, or the like. An annular groove is formed on the surface of the substrate on the side of the excitation light irradiation device 70, and the bottom of the groove is formed by silver evaporation or the like. The mirror is processed, and a green phosphor layer is laid on the mirrored surface. Furthermore, in the case of a transmission region among the diffusion transmission regions that transmit or diffusely transmit the excitation light, a transparent substrate having translucency is inserted into the cutout hole portion of the substrate. In the case of a region that diffuses and permeates, a transparent base material having a surface with fine irregularities formed by sandblasting or the like is inserted.

  When the green phosphor layer of the phosphor plate 101 is irradiated with blue wavelength band light as excitation light from the excitation light irradiation device 70, the green phosphor in the green phosphor layer is excited and green. Green wavelength band light is emitted in all directions from the phosphor. The fluorescent light beam is emitted toward the rear panel 13 and enters the condenser lens group 111. On the other hand, the blue wavelength band light from the excitation light irradiation device 70 that has entered the diffuse transmission region that transmits or diffuses and transmits the incident light in the fluorescent plate 101 is transmitted or diffused through the fluorescent plate 101, and in other words the back side of the fluorescent plate 101 (in other words For example, the light enters the condenser lens 115 arranged on the front panel 12 side.

  The light guide optical system 140 includes a condensing lens that condenses the light bundles of the red, green, and blue wavelength bands, and a reflection mirror that converts the optical axes of the light bundles of the respective color wavelength bands into the same optical axis, It consists of a dichroic mirror. Specifically, the light guide optical system 140 includes a blue wavelength band light emitted from the excitation light irradiation device 70, a green wavelength band light emitted from the fluorescent plate 101, and a red wavelength band emitted from the red light source device 120. A first dichroic mirror 141 that transmits both the blue and red wavelength band light, reflects the green wavelength band light, and converts the optical axis of the green wavelength band light by 90 degrees toward the left panel 15 at the position where the light intersects. Is arranged. That is, the first dichroic mirror 141 is arranged at approximately 45 ° with respect to each color wavelength band light.

  Further, the blue wavelength band light is reflected on the optical axis of the blue wavelength band light transmitted through or diffused through the fluorescent plate 101, that is, between the condensing lens 115 and the front panel 12, and the optical axis of the blue light is changed. A first reflecting mirror 143 that converts 90 degrees in the direction of the left panel 15 is disposed. A condensing lens 146 is disposed on the left panel 15 side of the first reflecting mirror 143, and a second reflecting mirror 145 is disposed on the left panel 15 side of the condensing lens 146. A condensing lens 147 is disposed on the rear panel 13 side of the second reflecting mirror 145. The second reflection mirror 145 converts the optical axis of the blue wavelength band light reflected by the first reflection mirror 143 and incident via the condenser lens 146 to the rear panel 13 side by 90 degrees.

  A condensing lens 149 is disposed on the left panel 15 side of the first dichroic mirror 141. Further, a second dichroic mirror 148 is disposed on the left panel 15 side of the condenser lens 149 and on the rear panel 13 side of the condenser lens 147. The second dichroic mirror 148 reflects the red wavelength band light and the green wavelength band light, converts the 90 ° optical axis to the back panel 13 side, and transmits the blue wavelength band light.

  The optical axis of the red wavelength band light transmitted through the first dichroic mirror 141 and the optical axis of the green wavelength band light reflected by the first dichroic mirror 141 so as to coincide with the optical axis of the red wavelength band light are collected. The light enters the lens 149. Then, the red and green wavelength band light transmitted through the condensing lens 149 is reflected by the second dichroic mirror 148 and is condensed at the entrance of the light tunnel 175 via the condensing lens 173 of the light source side optical system 170. . On the other hand, the blue wavelength band light that has passed through the condenser lens 147 passes through the second dichroic mirror 148 and is condensed at the entrance of the light tunnel 175 via the condenser lens 173.

  The light source side optical system 170 includes a condenser lens 173, a light tunnel 175, a condenser lens 178, an optical axis conversion mirror 181, a condenser lens 183, an irradiation mirror 185, and a condenser lens 195. The condenser lens 195 emits a projection image emitted from the display element 51 disposed on the back panel 13 side of the condenser lens 195 toward the projection lens unit 220, and thus is also a part of the projection lens unit 220. Yes.

  In the vicinity of the light tunnel 175, a condenser lens 173 that condenses the light source light at the entrance of the light tunnel 175 is disposed. Therefore, the red wavelength band light, the green wavelength band light, and the blue wavelength band light are collected by the condenser lens 173 and enter the light tunnel 175. The light beam incident on the light tunnel 175 is converted into a light beam having a uniform intensity distribution by the light tunnel 175.

  On the optical axis on the back panel 13 side of the light tunnel 175, an optical axis conversion mirror 181 is disposed via a condenser lens 178. The beam bundle emitted from the exit of the light tunnel 175 is condensed by the condenser lens 178 and then the optical axis is converted to the left panel 15 side by the optical axis conversion mirror 181.

  The light beam reflected by the optical axis conversion mirror 181 is condensed by the condenser lens 183 and then irradiated by the irradiation mirror 185 to the display element 51 through the condenser lens 195 at a predetermined angle. The display element 51 that is a DMD is provided with a heat sink 190 on the back panel 13 side, and the display element 51 is cooled by the heat sink 190.

  The light beam, which is the light source light irradiated to the image forming surface of the display element 51 by the light source side optical system 170, is reflected as a projection image on the image forming surface of the display element 51, and is passed through the projection lens unit 220 as projection light. Projected on. Here, the projection lens unit 220 includes a condenser lens 195, a movable lens group 235, and a fixed lens group 225. The movable lens group 235 is formed to be movable by a lens motor. The movable lens group 235 and the fixed lens group 225 are built in the fixed lens barrel. Therefore, the fixed lens barrel including the movable lens group 235 is a variable focus lens, and is formed so that zoom adjustment and focus adjustment are possible. The fixed lens group 225 and the movable lens group 235 are the projection lens 220A described above. In addition, an imaging element 49 that images the image forming surface of the display element 51 is disposed on the left front side of the display element 51.

  By configuring the projection device 10 in this way, when the fluorescent plate 101 is rotated and light is emitted from the excitation light irradiation device 70 and the red light source device 120 at different timings, light of each wavelength band of red, green, and blue is guided. Since the light is sequentially incident on the condenser lens 173 and the light tunnel 175 via the optical system 140 and further incident on the display element 51 via the light source side optical system 170, the DMD which is the display element 51 of the projection apparatus 10 is used as data. Accordingly, by displaying each color light in a time-sharing manner, a color image can be projected on the screen.

  Next, the on and off states of each mirror of the display element 51 that is a DMD controlled by the control unit 38 will be described with reference to the drawings. 4A, the control unit 38 according to the embodiment of the present invention controls the light source control circuit 41, the light source device 60, the display element 51, the display driving unit 26, and the imaging element 49, and projects a projected image on the screen. (ON light) A state in which the LI is projected (that is, shows an ON state and is also called an ON state).

  4B, the control unit 38 according to the embodiment of the present invention controls the light source control circuit 41, the light source device 60, the display element 51, the display driving unit 26, and the image sensor 49, and thereby the external light. Is projected from the projection port and projected on the image forming surface of the display element 51 via the projection lens 220A and its surroundings by the imaging element 49 (that is, an off state, also referred to as an off state). Is shown.

  Here, one of the plurality of mirrors provided on the image forming surface of the display element 51 is schematically illustrated as a mirror 51a and will be described below. The mirror 51a is formed in such a manner that each of the plurality of mirrors forms a row and a column.

  As shown in FIG. 4 (a), the light source device shown in FIG. 3 is used for white projection in which the red light source, the blue light source, and the excitation light source for exciting the green phosphor are turned on in a time-sharing manner. 60, when the light source control circuit 41 is controlled by the control unit 38 shown in FIG. 2, the light source light SL is reflected by the irradiation mirror 185, and the light source light SL is applied to each mirror 51a on the image forming surface of the display element 51. Irradiate. The display drive unit 26 shown in FIG. 2 controls the inclination of each mirror 51a of the display element 51 so as to form the projection image LI by modulating the light emitted from the light source device 60 (light source light SL) shown in FIG. Is done. Then, the display element 51 projects and displays the ON light as the formed projection image LI on the screen (not shown) as projection light through the projection lens 220A.

  In this way, in the on state, the control unit 38 controls the light source control circuit 41 as the light source control unit to turn on the light source device 60 with a predetermined brightness, and through the projection lens 220A (see FIG. Projection image LI is projected onto the image (not shown).

  On the other hand, as shown in FIG. 4B, when the red light source, the blue light source, and the excitation light source that excites the green phosphor are turned on in a time-sharing manner, The light emitted from the light source device 60 (light source light SL) is reflected by the mirrors 51a of the display element 51 to become off-light LF. The inclination of each mirror 51a of the display element 51 is controlled by the display driving unit 26 so that the light source light SL is turned off. When the mirror 51a is turned off, the projection aperture that is incident through the projection lens 220A is turned off in the off-field that turns off all of the red light source, blue light source, and excitation light source that excites the green phosphor of the light source device 60 shown in FIG. More forward external light OL is reflected by each mirror 51 a of the display element 51. The image sensor 49 is arranged so as to be able to image the external light OL reflected by each mirror 51a.

  In this manner, the control unit 38 illustrated in FIG. 2 can acquire information outside the projection apparatus 10 based on the information captured by the image sensor 49.

  Note that both the white projection in FIG. 4A and the black projection in FIG. 4B are all in the neutral state in which the mirror 51a in the effective outside region OR of the display element 51 is not always charged. ing. Therefore, the effective outside area OR is an uncontrollable area.

  On the other hand, the mirror 51a in the effective area ER is a controllable area. Therefore, even if the mirror 51a in the projection image area ER1 that is a part of the effective area ER is in the ON state, the mirror 51a in the effective area ER located in the outside projection image area ER2 that is around the projection image area ER1. In the off state, it is possible to detect whether or not there is a person HB in the area outside the projected image ER2 of the effective area ER by imaging the effective area ER with the imaging element 49.

  The image forming surface 52 set on the display element 51 will be described with reference to FIG. As shown in FIG. 5, on the image forming surface 52 of the display element 51 according to the embodiment of the present invention, a plurality of mirrors 51a are arranged in a region excluding the outer periphery of the image forming surface 52, and the mirror 51a is turned on / off. The effective part region ER that can be controlled and the effective part region ER that is located outside the effective part region ER and in which a plurality of mirrors 51a are arranged and in a neutral state in which no charge is always applied are set. Is done.

  The aspect ratio of the rectangular outer shape of the effective area ER of the display element 51 is various such as 16:10, 16: 9, 4: 3, and the like. In the present embodiment, an example in which the aspect ratio of the effective area ER of the display element 51 is 16: 9 is shown.

  The effective outside area OR is provided in an uncontrollable area outside the effective area ER on the image forming surface 52, and is always in a neutral state. Therefore, the effective outside area OR is an area where the projection image LI is not formed. Yes.

  Next, FIG. 6 shows that the control unit 38 according to the embodiment of the present invention shows that a person in the outside projection image area ER2 in the effective area ER is reflected in the effective area ER of the display element 51 and there is a person. The conceptual diagram which showed the example to determine is shown.

  The image pickup device 49 picks up the external light OL by picking up an image of the image forming surface 52 of the display device 51 when it is turned off as shown in FIG. The control unit 38 illustrated in FIG. 2 can acquire information outside the projection device 10 by imaging the external light OL by the imaging element 49. For example, the control unit 38 can detect that the person HB has entered the outside projection image area ER2 that is the effective area ER shown in FIG.

  In the embodiment of the present invention, it is assumed that the presence or absence of the person HB is determined by the external light OL reflected by the mirrors 51a in the outside projection image area ER2 at the off time, and is incident on the outside projection image area ER2 at the on time. The external light OL is not determined. Further, the target object is a person HB such as an explainer who explains the projection image using the projection device 10, but the target object is not limited to the person HB, and the area outside the projection image of the display element 51 is not limited to the person HB. Included are things that may enter ER2.

  Next, when the display element 51 modulates the light emitted from the light source device 60 to form a projection image LI, and the projection lens 220A projects the projection image LI modulated by the display element 51, the imaging element 49 A field configuration of one frame when imaging external information will be described.

  FIG. 7 is a timing chart showing a field configuration of one frame according to the embodiment of the present invention. FIG. 7A shows the timing when white light is emitted while the mirror 51a of the display element 51 is on. FIG. 7B shows the timing when black projection is performed because the mirror 51a of the display element 51 is in the OFF state. In the effective part region ER of the display element 51, a state in which the light source light from the light source device 60 is incident is shown. FIG. 7C shows a state where the light source light from the light source device 60 is not incident on the effective area ER of the display element 51. 7A to 7C, it is shown that the mirror in the projection image outside region ER2 of the display element 51 is fixed in the off state.

  As shown in FIGS. 7A to 7C, for example, in one frame corresponding to 1/120 [second], a red field, a blue field, a green field, and an off field (the above-described off state). It is composed of.

  FIG. 7A shows the timing at which red wavelength band light, blue wavelength band light, and green wavelength band light are emitted from the light source device 60 to the effective area ER of the display element 51. Light of any color is formed for each pixel by the light of each color emitted from the device 60. The light source device 60 emits red wavelength band light, blue wavelength band light, and green wavelength band light at each timing, and emits an arbitrary color for each pixel if the mirror composed of the DMD of the display element 51 is in an ON state. A color image can be projected.

  In the case of FIG. 7A, since red wavelength band light, blue wavelength band light, and green wavelength band light are emitted, white light is emitted. The light source device 60 is controlled by the light source control circuit 41 so as to be lit and driven in a time-sharing manner according to each color field.

  On the other hand, in the off-field, the mirror 51a in the effective area ER of the display element 51 is driven by the display driving unit 26 so that the projection image LI formed by the display element 51 is not guided to the projection lens 220A in the off state. The light source light SL from the light source device 60 is turned off. The off field is set to a period shorter than each field period as compared with the red field, the blue field, or the green field, and the effective element region ER is not temporarily projected by the mirror 51a, and is displayed by the image sensor 49. This shows that after the image forming surface of the display element 51 including the 51 effective area ER is imaged, the effective area ER is projected again. That is, in the off-field, the emission of the light source light SL from the light source device 60 is turned off, and at the same time, all the mirrors 51a in the effective area ER of the display element 51 are driven to the off state by the display driving unit 26. ing.

  FIG. 7B shows a state where the light source light from the light source device 60 is incident in the effective area ER. On the other hand, FIG. 7C shows a state where the light source light from the light source device 60 is not incident in the effective area ER. Further, as shown in FIG. 7B, all of the light source light incident from the light source device 60 becomes the off-light LF as shown in FIG. 4B.

  Thereby, the control unit 38 displays the display element 51 including the mirror 51a by the imaging element 49 at the off-field timing when each mirror 51a in the effective area ER of the display element 51 shown in FIG. To obtain information outside the projection apparatus 10.

  FIG. 7A shows an example in which the DMD used for the display element 51 is all white. However, in actual DMD, millions of pixels are independent and repeatedly turned on / off, and the actual observation period of external light OL is an off-field when the light source is off and when the DMD is off. As a color at the timing of not observing, not only white projection but also red projection, blue projection, or projection of various colors may be used.

  Further, in FIGS. 7B and 7C, each mirror 51a in the effective area ER of the display element 51 is always in an off state, so that the image sensor 49 displays the display element at the off-field timing. In addition to acquiring information outside the projection apparatus 10 and capturing information outside the projection apparatus 10, the imaging element 49 captures the display element 51 even during the red field, blue field, and green field periods, so that the effective portion is always externally provided. It is possible to monitor whether or not there is a person HB entering the outside projection image area ER2 in the area ER.

  FIG. 7B shows a black projection. FIG. 7C shows a state in a light source off mode such as a blank mode, or before projection or during switching. The state in which all such light sources (red light source, blue light source, green excitation light source) are turned off may be one frame out of 120 frames.

  Next, control at the time of projection of the projection apparatus 10 according to the embodiment of the present invention will be described in detail using a flowchart. FIG. 8 is a flowchart showing processing for controlling the light source device 60 when the projection apparatus 10 according to the embodiment of the present invention projects the projection image LI formed by the display element 51 onto the screen.

  First, when the main power supply of the projection apparatus 10 is turned on by the user, the light source device 60 emits red wavelength band light, blue wavelength band light, and green wavelength band light by the light source control circuit 41 being controlled by the control unit 38. To do. At the same time, the display drive unit 26 drives each mirror 51a in the projection image region ER1 within the effective region ER of the display element 51 under the control of the control unit 38, and drives to turn on the light in a time division manner (step S101). Thereby, the display element 51 forms the projection image LI in the on state, and projects and displays the projection image LI of a color image on the screen via the projection lens 220A.

  The control unit 38 determines whether or not it corresponds to an off-field in one frame of the effective area ER (step S103), and waits until it becomes an off-field of one frame (N in step S103). When the control unit 38 enters the off-field of one frame in the effective region ER (Y in Step S103), the control unit 38 emits light from the light source device 60 (that is, red wavelength band light, blue wavelength band light, and green wavelength band light). And the light source light) are turned off, and at the same time, the display drive unit 26 turns off each mirror 51a in the effective portion region ER of the display element 51.

  The control unit 38 controls the image sensor 49 to image the image forming surface 52 of the display element 51 (step S105). Based on the image forming surface 52 imaged by the image sensor 49, the control unit 38 determines whether or not there is a person in the area outside the projected image ER2 of the effective area ER (step S107). When it is determined that there is a person in the outside projected image area ER2 of the effective area ER (Y in Step S107), the control unit 38 controls to turn off the light source light from the light source device 60 (Step S107). S109), the time-division driving of the projection apparatus 10 is terminated.

  On the other hand, when it is determined that there is no person in the outside projected image area ER2 of the effective area ER (N in step S107), the control unit 38 continues to perform lighting driving by time division to turn off the next frame. It is determined whether or not the field is applicable (step S103), and an off-field is awaited (N in step S103).

  As described above, according to the embodiment of the present invention, the control unit 38 determines whether or not there is a person in the projected image outside region ER2 of the effective region ER based on the image forming surface 52 imaged by the imaging element 49. Determine. When it is determined that there is a person in the outside projected image area ER2 of the effective area ER, the control unit 38 performs control so that the light source light of the light source device 60 is turned off.

  As described above, the projection apparatus 10 acquires information on the effective area ER that is wider than the projection image area ER1 of the display element 51, thereby obtaining an external environment in a wider range than the projection image (projection light) LI. Information can be acquired and the light source device 60 can be controlled based on the information.

  In the embodiment of the present invention, the control unit 38 turns off the light source light from the light source device 60, but this embodiment is not limited to this. For example, the control unit 38 may reduce the light source light from the light source device 60. Here, the case where the control unit 38 reduces the light source light from the light source device 60 will be described with reference to the flowchart shown in FIG.

(Modification 1 of the first embodiment)
FIG. 9 is a flowchart illustrating a process in which the control unit 38 halves the light source light from the light source device 60 as the first modification of the first embodiment. The flowchart of FIG. 9 is different from the flowchart of FIG. 8 in the subsequent processing in the case of corresponding to Y in step S107. For this reason, the same processes as those in the flowchart of FIG. 8 are denoted by the same steps, and different processes will be described.

  As a first modification of the first embodiment, the control unit 38 determines the presence / absence of an object in the projected image outside region ER2 of the effective portion region ER based on the image forming surface 52 imaged by the imaging element 49 ( In step S107), when it is determined that there is a person in the outside projected image ER2 of the effective area ER (Y in step S107), the light amount is set so that the light source light from the light source device 60 is halved (step S201). ).

  Then, the number of halves of the light source light is determined. If the number of halves is 30 or more (Y in step S203), the light source light from the light source device 60 is controlled to be turned off (off) (step S109), the lighting drive by the time division of the projection apparatus 10 is finished.

  On the other hand, if the process for setting the light quantity to half is not more than 30 times, that is, from the first time to the 29th time (N in step S203), the control unit 38 reduces the light source light from the light source device 60 by half. In the illuminated state, the light source device 60 is driven to perform lighting by time division (step S101).

  The control unit 38 forms the projection image LI with the light source light reduced by half, and continues to determine whether or not it corresponds to the off-field of the next frame while projecting and displaying the color image (step S103). ), And waits for an off-field (N in step S103).

  As described above, according to the first modification of the first embodiment, the control unit 38 can not only turn off the light source device 60 but also reduce the light amount by setting the light amount to half. When it is determined that there is a person in the region ER2 outside the projected image, the projected image LI projected on the screen can be darkened. In addition, the control unit 38 can gradually darken the projected image LI to be projected and displayed by setting the number of times that the light amount by the light source device 60 is halved. Can be stopped.

  In addition, in the projection apparatus 10 using DMD, in many cases, the rotation speed of the fluorescent plate 101 that is a fluorescent wheel, that is, the rotation frequency is 120 Hz (7200 rotations per minute) that is twice the power supply frequency of 60 Hz, or It is regulated at a triple speed of 180 Hz (10800 revolutions per minute). Further, it is generally said that the time from the moment when a person feels dazzling until the eyes are closed is 0.25 seconds, and various standards are determined by whether or not they are within 0.25 seconds. For this reason, in the first modification of the first embodiment, 120 Hz is constantly monitored, that is, 30 times, which is 0.25 seconds. However, 30 times is only an example, and is not limited to this number.

  Moreover, the example which halves the light quantity of the light source light from the light source device 60 is an illustration, and is not limited to this. For example, the control unit 38 may set the light amount of the light source light from the light source device 60 to be reduced to 1/3 or 1/4. By setting in this way, it can be set to stop when the number of times of light reduction is 60 times or more or 120 times or more, so when a person to the outside projected image area ER2 of the effective area ER is detected In addition, it can be faded in steps.

(Modification 2 of the first embodiment)
As a second modification of the first embodiment, the control unit 38 is a case where there is a person in the outside projection image area ER2 of the effective area ER, and the projection image of the effective area ER for a predetermined time. When staying in the outer region ER2, the light source light from the light source device 60 can be controlled not to be extinguished or dimmed. In addition, the state where a person exists is defined as a case where a person entered is detected 30 times or more continuously.

  For example, the control unit 38 captures the effective area ER of the image forming surface 52 and recognizes the person or presence, and the person moves from the projected image outside area ER2 of the effective area ER to the projected image area ER1. Control is performed so that the light source light from the light source device 60 is extinguished or dimmed only when moving. On the other hand, when the person does not move from the projection image outside area ER2 of the effective area ER to the projection image area ER1, the control unit 38 continues the emission of the light source device 60 (so as not to turn off or reduce the light). Control.

  In this case, even when the control unit 38 recognizes the presence of a person in the projection image outside region ER2 of the effective part region ER, for example, the control unit 38 sets the number of frames in which the existence of a person is recognized in the projection image outside region ER2 of the effective part region ER. When the number of frames exceeds a predetermined number of frames (for example, when the presence of more than 240 frames is recognized), the light is turned off or dimmed. Conversely, the effective area ER is projected during the predetermined number of frames. When the movement of the person from the outside image area ER2 to the projection image area ER1 cannot be detected, the light source device 60 is controlled to continue emission. Note that the second modification of the first embodiment is not limited to the predetermined number of frames, and may be measurement of a predetermined time.

  As described above, according to the second modification of the first embodiment, even when the control unit 38 recognizes the presence of a person in the outside projected image area ER2 of the effective part area ER, the predetermined number of frames. Or a predetermined time is measured, and the light source light from the light source device 60 is not extinguished or dimmed based on the predetermined number of frames and the situation of the projection image outside region ER2 of the effective area ER for the predetermined time. Can be controlled.

(Second Embodiment)
As a second embodiment of the present invention, an application example of recognizing the presence of a person in the effective area ER and controlling the projection image LI projected on the effective area ER will be described. FIG. 10 is a configuration diagram showing a configuration in which the information processing apparatus 500 is connected to the projection apparatus 10 and the projection image LI is projected and displayed on the screen as the second embodiment.

  In the second embodiment, the control unit 38 determines a position where a person (object) exists in the effective area ER based on the captured image forming surface, and changes the projection light according to the position of the person. The associated operation function is displayed superimposed on the projection light.

  As shown in FIG. 10, the projection apparatus 10 is connected to the information processing apparatus 500 through a VGA cable CB1 and a USB cable CB2. The information processing apparatus 500 supplies an image signal to be projected and displayed on the screen to the projection apparatus 10 via the VGA cable CB1. The projection device 10 projects and displays a projection image corresponding to the image signal supplied from the information processing device 500 on the screen.

  In FIG. 10A, the projection apparatus 10 projects and displays the image signal supplied from the information processing apparatus 500 on the projection image area ER1 of the screen. The control unit 38 causes the imaging element 49 to image the effective part region ER including the projection image outside region ER2 in the off state, that is, in the off-field timing of one frame. Since the image of the outside projection image area ER2 is reflected by the plurality of mirrors 51a in the effective area ER of the display element 51, the imaging element 49 acquires information on the outside projection image area ER2 by imaging the display element 51. can do.

  In this case, the control unit 38 determines the position where the hand of the person HB such as the presenter exists in the effective part area ER based on the effective part area ER of the imaged display element 51, and the hand of the person HB The position information is output to the information processing apparatus 500. When the information processing apparatus 500 obtains the position information of the hand of the person HB, the information processing apparatus 500 can recognize that the person HB is located on the left side of the projection image outside region ER2, and accordingly, according to the position of the hand of the person HB. Thus, the icon IC1, which is an associated operation function, is superimposed on the projection image (projection light) LI projected on the screen.

  Note that the icon IC1 indicates, for example, an operation function associated with the projection image LI, and functions of an application that causes the information processing apparatus 500 to display the projection image LI include functions such as page turning and scrolling, for example. GUI (Graphical User Interface) or the like.

  In FIG. 10B, the projection apparatus 10 similarly displays the same image signal supplied from the information processing apparatus 500 in the projection image area ER1 of the screen. Similarly to FIG. 10A, the control unit 38 images the display element 51, and based on the effective area ER of the imaged display element 51, the control unit 38 sets the human HB in the area outside the projected image ER2 of the effective area ER. The position where the hand is present is determined, and the position information of the hand of the person HB is output to the information processing apparatus 500. When the information processing apparatus 500 acquires the position information of the hand of the person HB, the information processing apparatus 500 can recognize that the person HB is located on the right side of the outer area OR2 of the screen. Thus, the icon IC2 associated with the projected image LI projected on the screen can be displayed in a superimposed manner.

  As described above, according to the second embodiment, the control unit 38 is based on the captured image information of the display element 51, and the person HB existing in the outside projected image area ER2 of the effective area ER of the display element 51. The position information of the hand of the person HB is output to the information processing apparatus 500. When the information processing apparatus 500 acquires the position information of the hand of the person HB, the information processing apparatus 500 can recognize the position where the person HB is located in the projected image outside area ER2 on the screen. Thus, the associated operation function can be superimposed and displayed on the projection image (projection light) LI projected on the projection image area ER1 of the screen.

  As described above, the projection apparatus 10 projects the information on the external environment wider than the range of the projection image area ER1 emitted to the effective part area ER of the display element 51, thereby projecting the projection image area ER1 on the screen. The icons IC1, IC2, etc. can be superimposed and displayed on the projected image LI.

  In the second embodiment, the control unit 38 outputs the position information of the person HB to the information processing apparatus 500 and displays the icon IC1 or the like that is an operation function. However, the present invention is not limited to this. is not. For example, the information processing apparatus 500 may automatically correct the shape of the projection image LI displayed on the screen based on the position information of the person HB.

  Specifically, the information processing apparatus 500 acquires the position information of the person HB, thereby performing a keystone correction on the projection image LI projected on the projection image area ER1 of the screen, or changes in the position information of the person HB. Accordingly, position correction can be performed in real time. The shape correction may be performed by the image conversion unit 23 of the projection device 10 or the information processing device 500 may perform the shape correction.

  As described above, the projection device 10 of the present invention modulates the light source device 60, the light source light from the light source device 60, forms the projection image LI, and the projection image LI is incident and emits the projection light. A projection lens 220 </ b> A that performs imaging, an imaging element 49 that is arranged so as to image the image forming surface 52 of the display element 51, and a control unit 38 that controls the display element 51 and the light source device 60. The image forming surface 52 of the display element 51 includes an effective area ER including a projection image area ER1 and an outside projection image area ER2 that define the size of the projection image LI to be formed, and an effective area provided outside the effective area ER. An outside region OR.

  Thereby, the control unit 38 determines the presence / absence of a person in the area outside the projected image ER2 in the effective area ER based on the image forming surface 52 imaged by the imaging element 49, and the outside of the projected image in the effective area ER. When it is determined that there is a person who is the object in the region ER2, the light source light from the light source device 60 can be controlled to be turned off or dimmed. As described above, the projection device 10 can control the light source device 60 by acquiring information on the external environment in a wider range than the projection image region ER1 projected on the screen.

  Further, when the display driving unit 26 receives an instruction from the control unit 38 and emits projection light by the projection lens 220A, the display driving unit 26 causes the light source light from the light source device 60 to enter the image forming surface 52 of the display element 51. When the image forming surface 52 is imaged by the image sensor 49, the angle of the mirror 51a is switched so that an area including the effective area ER of the display element 51 is imaged.

  As described above, the control unit 38 controls the display driving unit 26 so that when the projection lens 220A emits the projection light, the control unit 38 causes the light source light SL from the light source device 60 to enter the effective part region ER, When the image forming surface 52 is picked up by the image pickup device 49, the angle of the mirror 51a can be switched so as to pick up an image of the display element 51 including the region outside the projected image ER2.

  Further, the control unit 38 is a case where the person HB exists in the outside projection image area ER2 of the effective area ER, and the person HB stays in the outside projection image area ER2 of the effective area ER for a predetermined time. In this case, it is possible to perform control so that the light source light SL from the light source device 60 is not extinguished or dimmed. Even when the control unit 38 recognizes the presence of the person HB in the outside projected image area ER2 of the effective area ER, the control unit 38 measures the predetermined number of frames and the predetermined time, and determines the predetermined number of frames and the predetermined time. The light source light SL from the light source device 60 can be controlled not to be extinguished or dimmed according to the situation of the outside projection image area ER2.

  Further, the control unit 38 determines a position where the person HB exists in the outside projected image area ER2 of the effective part area ER based on the captured image forming surface 52, and the projection light according to the position of the person HB. You may make it display the operation function linked | related to (2) on projection light. Thereby, the control unit 38 can superimpose and display icons IC1, IC2 and the like as operation functions on the projection image LI projected on the projection image area ER1 of the screen.

  The light source control circuit 41 further controls the light source light from the light source device 60. The light source control circuit 41 receives an instruction from the control unit 38 and turns off or reduces the light source light SL from the light source device 60. It may be. The control unit 38 can reduce or extinguish the light source light from the light source device 60 by controlling the light source control circuit 41.

  Further, the light source device 60 can emit red, green, or blue wavelength band light. Thereby, the projection apparatus 10 can project and display the projection image LI formed in the display element 51 by a color image.

  Further, the embodiment described above is presented as an example, and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  For example, in step S107 of the first embodiment, the control unit 38 is configured to determine whether or not there is a person HB in the area outside the projected image ER2 of the effective area ER. When the effective region ER is imaged by the imaging element 49, the mirror 51a of the display element 51 is easily affected by disturbance light. For example, it is assumed that unexpected reflection or the like occurs in a bright room. Therefore, when the effective area ER is imaged, image processing may be performed so that the color that is the source of the disturbance light is canceled in the image sensor 49.

  Specifically, when red is incident on the image sensor 49, image processing is performed so that blue and green are erased, and when green is incident on the image sensor 49, red and blue are erased. Processing may be performed.

  Further, for example, in the first embodiment, when the person HB is recognized in the outside projected image area ER2 of the effective area ER in step S107, the emission of the light source device 60 is turned off. Here, in the first embodiment, a warning message may be displayed by projection or output from the speaker 48 before the light source light from the light source device 60 is turned off.

  Specifically, when the presence of the person HB is recognized in the outside projected image area ER2 of the effective portion area ER of the display element 51, the projected image LI for 12 frames or 24 frames is projected and displayed. Warnings such as “Please move away from the screen!” Or “You may feel dazzling because it is close to the light source device!”.

  In this case, the control unit 38, after a warning, when a person has withdrawn from the projected image outside area ER2 of the effective area ER for a predetermined time or until a predetermined number of frames elapses, Light extinction or dimming can be avoided.

  As described above, the control unit performs control to change the projection condition of the projection light. Control for changing the projection condition includes control of the light source device and control of the display element. As the control of the light source device, any one of turning off the light source light from the light source device, dimming, and outputting a message is performed. As control of the display element, the projected image can be darkened by performing gamma correction on the image information.

  In the first embodiment, the control unit 38 causes the image sensor 49 to image the image forming surface 52, and based on the imaged image forming surface 52, the control unit 38 moves the human to the outside projected image region ER2 of the effective region ER. The presence or absence was to be judged. Thus, when the aspect ratio of the projected image area ER1 of the input image is different from the aspect ratio of the effective area ER of the display element 51, a wider range than the projected image area ER1 can be detected. You can set the area.

  For example, as shown in FIG. 11, on the image forming surface 52A, when the aspect ratio of the input image is 4: 3, the projection image region ER1 also has an aspect ratio of 4: 3. On the other hand, if the aspect ratio of the effective area ER is 16: 9, the right and left ends of the projection image area ER1 can detect the presence or absence of the person HB as the detection target area DR.

  The detection target area DR that is the outside projection image area ER2 is provided outside the projection image area ER1. On the image forming surface 52A, the vertical and horizontal lengths of the effective area ER having an aspect ratio of 16: 9 and the projected image area ER1 having an aspect ratio of 4: 3 are aligned and the vertical length of the effective area ER is set. Is adjusted to the vertical length of the projection image area ER1, the aspect ratio 16: 9 set in the effective area ER has a larger horizontal ratio than the projection image area ER1, and thus the aspect ratio 4: A region that is wider than the region 3 is set as the detection target region DR.

The invention described in the first claim of the present application will be appended below.
[1] a light source device;
A display element that modulates light source light from the light source device to form a projected image;
A projection lens that receives the projection image and emits projection light; and
An image sensor arranged to image the display element;
A control unit that controls the display element, the light source device, and the imaging element;
With
The control unit determines the presence or absence of an object in a region outside the projection image captured by the imaging device, and determines that the object is in the region outside the projection image, the projection condition of the projection light is determined. A projection apparatus characterized by changing.
[2] The area outside the projection image is an effective area that is located outside the projection image area projected on the projection surface and that can control a plurality of mirrors provided in the display element. The projection device according to [1].
[3] A display element control unit that controls angles of a plurality of mirrors provided in the display element is further provided,
When the projection lens emits the projection light, the display element control unit causes the light source light from the light source device to enter the image forming surface, and on the other hand, when the image forming surface is imaged by the imaging device. The projection device according to [2], wherein the angles of the plurality of mirrors in the effective area are switched.
[4] The control unit, when the object is present in the area outside the projected image in the effective area of the display element, and the object is present in the area outside the projected image for a predetermined time, The projection device according to [2] or [3], wherein the light source light from the light source device is not extinguished or dimmed.
[5] The control unit determines a position where the object is present in the area outside the projection image of the effective area of the imaged display element, and applies the projection light according to the position of the object. The projection apparatus according to any one of [2] to [4], wherein the associated operation function is displayed superimposed on the projection light.
[6] The projection device according to any one of [1] to [5], wherein the light source device emits red, green, or blue wavelength band light.
[7] The projection apparatus according to any one of [1] to [6], wherein the object is a person.
[8] The control for changing the projection condition of the projection light is control of the light source device for turning off or reducing light source light, outputting a message, or control of the display element. The projection device according to any one of [1] to [7].

DESCRIPTION OF SYMBOLS 10 Projector 11 Top panel 12 Front panel 13 Back panel 14 Right panel 15 Left panel 17 Exhaust hole 18 Intake hole 19 Lens cover 21 Input / output connector part 22 Input / output interface 23 Image conversion part 24 Display encoder 25 Video RAM
26 Display drive unit 31 Image compression / decompression unit 32 Memory card 35 Ir reception unit 36 Ir processing unit 37 Key / indicator unit 38 Control unit 41 Light source control circuit 43 Cooling fan drive control circuit 45 Lens motor 47 Audio processing unit 48 Speaker 49 Imaging Element 51 Display element 60 Light source device 60A Light source device 60B Light source device 60C Light source device 70 Excitation light irradiation device 70B Excitation light irradiation device 70C Excitation light irradiation device 71 Blue laser diode 71C Laser diode 73 Collimator lens 75 Reflective mirror group 75C Reflective mirror 76 Mirror Substrate 78 Condensing lens 80 Color light source device 80 Green light source device 80B Green light source device 80C Green light source device 81 Heat sink 100 Fluorescent plate device 100B Fluorescent plate device 100C Fluorescent plate device 101 Fluorescent plate 101B Fluorescent plate 101C Fluorescent Optical plate 110 Motor 111 Condensing lens group 111C Condensing lens group 115 Condensing lens 120 Red light source device 120A Red light source device 120C Red light source device 121 Red light source 124 Spectroscopic plate 125 Condensing lens group 125A Optical device 125C Condensing lens group 130 Heat sink 140 Light guiding optical system 141 First dichroic mirror 141B First dichroic mirror 141C First dichroic mirror 143 First reflecting mirror 145 Second reflecting mirror 146 Condensing lens 147 Condensing lens 148 Second dichroic mirror 148B Second dichroic mirror 149 Optical lens 170 Light source side optical system 173 Condensing lens 175 Light tunnel 178 Condensing lens 181 Optical axis conversion mirror 183 Condensing lens 185 Irradiation mirror 190 Heat sink 195 Lens lens 220 Projection lens unit 225 Fixed lens group 220A Projection lens 235 Movable lens group 241 Control circuit board 261 Cooling fan 300B Blue light source device 301C Blue laser diode 303C Collimator lens 321B Blue light source 325B Condensing lens group

Claims (8)

A light source device;
A display element that modulates light source light from the light source device to form a projected image;
A projection lens that receives the projection image and emits projection light; and
An image sensor arranged to image the display element;
A control unit that controls the display element, the light source device, and the imaging element;
With
The control unit determines the presence or absence of an object in a region outside the projection image captured by the imaging device, and determines that the object is in the region outside the projection image, the projection condition of the projection light is determined. A projection apparatus characterized by changing.   The area outside the projection image is an effective area that is located outside the projection image area projected on the projection surface and that can control a plurality of mirrors provided in the display element. The projection apparatus according to 1. A display element control unit for controlling the angles of a plurality of mirrors provided in the display element;
When the projection lens emits the projection light, the display element control unit causes the light source light from the light source device to enter the image forming surface, and on the other hand, when the image forming surface is imaged by the imaging device. The projection apparatus according to claim 2, wherein the angles of the plurality of mirrors in the effective area are switched.   When the object is present in the area outside the projected image of the effective area of the display element and the object is present in the area outside the projected image for a predetermined time, the light source device The projection device according to claim 2, wherein the light source light from the light source is not turned off or dimmed.   The control unit determines a position where the object exists in the area outside the projection image of the effective part area of the imaged display element, and is associated with the projection light according to the position of the object The projection apparatus according to claim 2, wherein an operation function is superimposed on the projection light.   The projection apparatus according to claim 1, wherein the light source device emits red, green, or blue wavelength band light.   The projection apparatus according to claim 1, wherein the object is a person.   The control for changing the projection condition of the projection light is control of the light source device for turning off or reducing light source light or outputting a message, or control of the display element. The projection device according to any one of 1 to 7.

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