JP5365453B2 - Rear projection type screen and rear projection type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display a three-dimensional image without using a three-dimensional image display method, such as a parallax barrier method. <P>SOLUTION: A planar projection position is a predetermined position where a structure 27 is not in contact with an elastic screen 16 as shown in Fig.(A). In the state of the planar projection position, the elastic screen 16 is maintained in the planar form. A planar image is displayed by projecting from a projector 7 in this state. A stereographic projection position is a position where a swelling part 28 of the structure 27 is pressure welded with the elastic screen 16 as shown in Fig.(B). Thus, in the state of the stereographic projection position, as shown in Fig.(B), the elastic screen 16 is in the state that it swells to the side of an observation surface 18 and is distorted according to the pressure welding of the swelling part 28. A stereographic image is displayed by projecting from a projector 7 in this state. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a rear projection screen and a rear projection display device using the same.

  In general, a rear projection screen has a projection surface on which an image is projected on one surface side and a planar surface having an observation surface for observing an image projected on the projection surface on the other surface side. The Fresnel lens sheet is arranged on the side, and the light diffusion sheet is arranged on the observation surface side. Then, an image is projected onto a Fresnel lens sheet by a projection device such as a projector, and an image transmitted through the projected light diffusion sheet is viewed from the observation surface side (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2007-219058

  In the image projected by the projection device, there are not only images in which flat display of characters or the like is preferable, but also images in which stereoscopic display is preferable in order to enhance the sense of reality. However, since the conventional rear projection screen merely observes a projected image on one side on the other side, even a stereoscopic display is preferable, it is only displayed in a plane. . Therefore, it is not possible to enhance the sense of reality by displaying a specific image in three dimensions, or to improve the playability of the image as a screen of a game device.

  Of course, if a 3D display device is used, it is possible to enhance the sense of reality by 3D image display. A stereoscopic display device generally employs a parallax barrier method, and a parallax barrier method is provided with a barrier pattern in front of a display module. The display module cuts the left and right images and arranges them alternately and observes them through the barrier pattern, thereby enabling stereoscopic display.

  Therefore, since the stereoscopic display device uses different images on the left and right, it is not possible to display the image normally used for a projector or the like as it is. In addition, there is a problem that the observer is likely to feel fatigue due to the mismatch between convergence (rotational movement of both eyes) and adjustment (focusing).

  The present invention has been made in view of such conventional problems, and a rear projection screen and a rear projection capable of displaying a stereoscopic image without using a stereoscopic image display method such as a parallax barrier method. An object of the present invention is to provide a type display device.

  In order to solve the above-mentioned problem, the rear projection screen according to the first aspect of the present invention has a projection surface on which an image is projected on one surface side and an image projected on the projection surface on the other surface side. A flat screen having an observation surface for observing the screen, and having an elastic screen capable of elastic deformation and having a bulging portion disposed on the projection surface side of the elastic screen and bulging in the screen direction A transparent structure, a planar projection position in which the structure is separated from the projection surface to maintain the elastic screen in a flat shape, and the elastic screen is bulged toward the observation surface by being pressed against the projection surface And driving means for driving the deformed stereoscopic projection position.

Further, in the rear projection screen according to the second aspect of the invention, the elastic screen provided on the front, having at least the back surface of the box body of transparent, the structure is arranged in the box body It is characterized by that.

  The rear projection screen according to the invention described in claim 3 is characterized in that the box is filled with a transparent liquid.

  According to a fourth aspect of the present invention, the rear projection screen includes a reserve tank that communicates with the box and stores the liquid.

  In the rear projection screen according to the invention described in claim 5, the liquid and the structure have substantially the same refractive index.

  Further, in the rear projection screen according to the invention described in claim 6, the elastic screen has light diffusibility.

  In the rear projection type screen according to the seventh aspect of the present invention, the bulging portion of the structure has a spherical shape.

  In the rear projection type screen according to the eighth aspect of the present invention, the bulging portion of the structure body is characterized in that the peripheral edge portion is a regular circle and has a spherical shape.

  In the rear projection screen according to the ninth aspect of the invention, the bulging portion of the structure is rectangular in a front view as viewed from the elastic screen side, and the top surface is planar. It is characterized by that.

  In the rear projection type screen according to the invention described in claim 10, the bulging portion of the structure has an elliptical peripheral edge and a spherical shape.

  In the rear projection screen according to the invention described in claim 11, the bulging portion of the structure is circular in a front view as viewed from the elastic screen side, and the top surface is planar. It is characterized by that.

  A rear projection display device according to a twelfth aspect of the invention is a rear projection display device comprising the rear projection type screen according to any one of the first to eleventh aspects, wherein the elastic screen is projected. A determination unit that determines whether the image projected on the surface side is the first image type to be projected in plane or the second image type to be stereoscopically projected; The driving unit is controlled to drive the structure to the planar projection position when the image type is the first image type, and to drive the structure to the stereoscopic projection position when the image type is the second image type. And a control means.

Further, in the rear projection display device according to the thirteenth aspect of the invention, the control means drives the structure according to the shape of the stereoscopic image when the image is a stereoscopic image type. The amount of movement at the time is controlled.

  According to a fourteenth aspect of the present invention, there is provided a rear projection display device comprising a projection unit that projects an image on the projection surface side of the screen.

  According to the present invention, it is possible to display a stereoscopic image without using a stereoscopic image display method such as a parallax barrier method that easily causes fatigue to the observer. Therefore, the playability of the image can be enhanced without causing the player to feel tired as the screen of the game device. It is also possible to display a stereoscopic image using general image data for projection without using dedicated image data for displaying a stereoscopic image.

It is a perspective view which shows the whole structure in the 1st Embodiment of this invention. (A) is a horizontal sectional view of a rear projection type screen, and (B) is a vertical sectional view of a reserve tank. FIG. 3 is an enlarged view of a part α in FIG. 2. (A) is a front view of an elastic screen, (B) is an end view taken along line bb of (A), and (C) is an end view taken along line cc of (A). It is a block diagram which shows the circuit structure of a projector. It is a block diagram which shows the circuit structure of a control unit. (A) is a flowchart which shows the process sequence of a projector. (A) is explanatory drawing which shows the state at the time of plane projection, (B) is explanatory drawing which shows the state at the time of a three-dimensional projection. (A) is a perspective view which shows the example of a display at the time of plane projection, (B) is explanatory drawing which shows the example of a display at the time of a three-dimensional projection. It is a perspective view which shows the whole structure in the 2nd Embodiment of this invention. It is a block diagram which shows the circuit structure of the embodiment. It is a flowchart which shows the process sequence in the embodiment. It is a figure which shows the modification of an elastic screen.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a perspective view showing the overall configuration of the first embodiment of the present invention. This embodiment includes a rear projection display device 5 including a rear projection screen 1 and a control unit 4 connected to each other, and a projector 7 connected to the control unit 4. The rear projection screen 1 has a box-shaped case 11 made of a rectangular parallelepiped, and a reserve tank 14 is connected to one side of the case 11 in communication. As shown in FIG. 2A, the case 11 is provided with a rectangular opening 12 in the front surface 15 and at least the back surface 13 is transparent. Further, the back surface 13 is formed of an acrylic resin having a refractive index of “1.49” similarly to the structure 27 described later.

  An elastic screen 16 having translucency and light diffusibility is stretched in the opening 12. The elastic screen 16 has a projection surface 17 on which an image is projected on the inner surface side of the case 11, and an observation surface 18 on which the image projected on the projection surface 17 is observed on the outer surface side. The elastic screen 16 is made of an elastic material such as silicone rubber or latex.

  Gear shafts 19 and 20 are rotatably mounted on both sides of the case 11 where the elastic screen 16 is avoided. Male threads are engraved on the peripheral surfaces of the portions of the gear shafts 19 and 20 that extend into the case 11 over substantially the entire length. The front end portions of the gear shafts 19 and 20 are rotatably supported on the front end surfaces of the projecting portions 11 a and 11 b that are provided on the front surface 15 and project into the case 11. Further, the base end portion where the male screw of the gear shaft 20 is not formed is through a through hole 21 provided in the back surface 13 of the case 11, as shown in FIG. Projecting to the outside of the case 11.

  A pair of waterproof seals 22 that are in sliding contact with the base end portion of the gear shaft 20 are fitted into the through holes 21. A packing 23 is press-fitted between the waterproof seal 22 and the inner and outer surfaces of the back surface 13, and an O-ring 24 is interposed between the packing 23 and the gear shaft 20. Thereby, the water-tightness of the case 11 is ensured, and the rotation of the gear shaft 20 is ensured. Further, the base end portion of the gear shaft 20 is coupled to the rotating shaft of the motor 26, and the motor 26 is fixed to the case 11 by fixing means (not shown).

  3 shows only the configuration on the one gear shaft 20 side, the configuration on the other gear shaft 19 side is the same as this, and the base end portion has a motor as shown in FIG. The motor 25 is also fixed to the case 11 by fixing means (not shown).

  A structure 27 is disposed inside the case 11. This structure 27 is transparent, and in this embodiment, is formed of an acrylic resin having a refractive index of “1.49”. The structure 27 has a slightly larger area than the elastic screen 16, is arranged in parallel with the elastic screen 16, and both ends are screwed to the pair of gear shafts 19 and 20. Therefore, when the gear shafts 19 and 20 rotate synchronously, the structure 27 can be translated in a direction away from the elastic screen 16 and a direction close to the elastic screen 16.

  A bulging portion 28 bulging in the direction of the elastic screen 16 is formed at the center of the structure 27. In the present embodiment, the bulging portion 28 is formed of a spherical surface of a regular sphere having a radius R, as shown in FIG. Therefore, the bulging portion 28 has a spherical shape with a peripheral portion that is a perfect circle.

  On the other hand, as shown in FIG. 2 (B), the reserve tank 14 is a box having an opening 29 only in the upper part, and an elastic sheet 30 is stretched over the opening 29. . A transparent liquid 31 is filled in the sealed space formed by the case 11 and the reserve tank 14. This transparent liquid 31 is paraffin oil having a refractive index of “1.48” in the present embodiment. Therefore, the liquid 31 and the structure 27 (refractive index = 1.49) immersed in the liquid 31 have substantially the same refractive index.

  The case 11 may be transparent not only on the back surface 13 but also in this case. In this case, the entire case 11 may be formed of acrylic resin. The elastic screen 16 has a rigidity capable of maintaining a flat plate shape against the water pressure by the liquid 31, and has a flexibility capable of elastic deformation when the bulging portion 28 of the structure 27 is in pressure contact. Yes. Further, the projector 7 is disposed behind the back surface 13, and the position thereof is adjusted so that the optical axis of the lens 71 is orthogonal to the central portion of the back surface 13.

  FIG. 5 is a block diagram showing an electrical configuration of the projector 7. The projector 7 includes a control unit 72, an input / output interface 73, an image conversion unit 74, a display encoder 75, a display drive unit 76, and the like. An input / output connector unit 77 is connected to the input / output interface 73. ing. Then, the control unit 4 of the rear projection display device 5 shown in FIG.

  The image compression / decompression unit 78 compresses the luminance signal and color difference signal in the image signal by processing such as ADTC and Huffman coding, and writes the data to a memory card 79 which is a removable recording medium. A readout process for reading out the image data recorded in is performed. The image data read from the memory card 79 is converted by the image conversion unit 74 so as to be unified into an image signal of a predetermined format suitable for display via the system bus 81 and then sent to the display encoder 75. .

  The image data read from the memory card 79 is also sent to the control unit 4 via the input / output interface 73 and the input / output connector 77.

  The display encoder 75 develops and stores the transmitted image signal in the video RAM 80, generates a video signal from the stored contents of the video RAM 80, and outputs the video signal to the display drive unit 76. The display driving unit 76 to which the video signal is input from the display encoder 75 drives the display element 82 which is a spatial light modulation element (SOM) at an appropriate frame rate in accordance with the transmitted image signal. Then, the light beam emitted from the light source device 83 is incident on the display element 82 through the light source side optical system, thereby forming an optical image with the reflected light of the display element 82, and an image is formed through the lens 71. Project. The lens 71 is driven by a lens motor 84 for zoom adjustment and focus adjustment.

  The control unit 72 controls the operation of each circuit in the projector 7, and includes a CPU and its peripheral circuits, a ROM 721, a RAM 722, and the like. The ROM 721 stores programs such as various settings, programs shown in flowcharts described later, data, and the like in advance, and the RAM 722 is used as a work memory or the like.

  The key / indicator unit 85 includes a main key and an indicator provided on the main body case and the like, and an operation signal thereof is sent to the control unit 72. A key operation signal from the remote controller is received by the Ir receiver 86, demodulated by the Ir processor 87, and a code signal is sent to the controller 72.

  In addition, the control unit 72 controls the light source control circuit 88 to perform time-division control on the red light source, the green light source, and the blue light source according to the image signal. The cooling fan drive control circuit 89 performs temperature detection by a plurality of sensors provided in the light source device 83 and the like, controls the rotation speed of the cooling fan, and rotates the cooling fan even after the projector body is turned off by a timer or the like. , And depending on the result of temperature detection by the temperature sensor, the projector is also turned off.

  FIG. 6 is a block diagram showing an electrical configuration of the control unit 4. The control unit 4 includes an input / output connector section 41, an input / output interface 42, a control section 43, a motor driver 44, and the like. Image data sent from the projector 7 is input to the control unit 43 via the input / output connector unit 41 and the input / output interface 42.

  The control unit 43 controls the operation of the control unit 4 and includes a CPU and its peripheral circuits, a ROM 431, a RAM 432, and the like. The ROM 431 stores in advance a program shown by a flowchart described later, and the RAM 432 is used as a work memory or the like. The motors 25 and 26 are connected to the motor driver 44, and the motor driver 44 synchronously controls the motors 25 and 26 according to instructions from the control unit 43.

  In the image data read from the memory card 79 and sent from the projector 7 to the control unit 4, “flg = 1” is recorded for an image to be stereoscopically projected and “flg = 0” for an image to be planarly projected. Is recorded. In addition, the amount of movement of the structural body 27 in the direction of the elastic screen 16 is also recorded in the image to be stereoscopically projected with “flg = 1” recorded in accordance with the stereoscopic degree when the image is projected.

  In the first embodiment having the above configuration, the control unit 72 of the projector 7 executes processing as shown in the flowchart of FIG. 7A based on a program stored in the ROM 721. First, image data is read from the memory card 79 at a frame rate according to the standard of the image data (step SA1). The read image data is output to the control unit 4 via the input / output interface 73 and the input / output connector section 77 (step SA2).

  On the other hand, the control unit 43 of the control unit 4 executes processing as shown in the flowchart of FIG. 7B based on the program stored in the ROM 431. That is, the image data output from the projector 7 in step SA2 is input via the input / output connector 41 and the input / output interface 42 (step SB1). Next, it is determined whether or not the flg of the input image data is “1” (step SB2). If flg is “0” and the image data is an image to be planarly projected, it is determined whether or not the structure 27 is at the planar projection position (step SB3).

  In determining the position of the structure 27, the driving history of the motors 25 and 26 by the motor driver 44 is stored in the RAM 432, and the position of the structure 27 is determined from the history. Here, the planar projection position of the structure 27 is a predetermined position where the structure 27 is not in contact with the elastic screen 16 as shown in FIG. In the state of the planar projection position, as shown in the figure, the elastic screen 16 is maintained in a flat shape, the reserve tank 14 is maintained in a full state, and the seat 30 is also maintained in a flat state.

  If the structure 27 is already at the planar projection position, the process proceeds to step SB7 without performing the process of step SB4, and a moved notification is output to the projector 7 (step SB7). When the structure 27 is not in the plane projection position, the motor 27 is controlled to drive the motors 25 and 26, and the gear shafts 19 and 20 are rotated in the reverse direction. (Step SB4), a movement completion notice is output to the projector 7 (step SB7). Then, the control unit 72 of the projector 7 inputs this movement amount completion notification (step SA3), and starts a projection process based on the image data read in step SA1 (step SA4).

  That is, the image data is converted by the image conversion unit 74, and the image signal is developed and stored in the video RAM 80 by the display encoder 75, and then the video signal is generated from the stored contents of the video RAM 80 and output to the display drive unit 76. . The display driving unit 76 drives the display element 82 in response to the transmitted image signal, and the light beam emitted from the light source device 83 is incident on the display element 82 via the light source side optical system, thereby displaying the display element 82. An optical image is formed by the reflected light of the element 82, and the image is projected through the lens 71.

  Then, the projected image is projected onto the projection surface 17 of the elastic screen 16 through the transparent back surface 13, the liquid 31, and the structure 27. At this time, the liquid 31 is filled in the case 11, and the back surface 13, the liquid 31, and the structure 27 have substantially the same refractive index, so that the image projected from the lens 71 is not refracted. Projection onto the projection surface 17 is possible.

  As described above, when an image is projected onto the projection surface 17, the elastic screen 16 has light diffusibility. Therefore, as shown in FIG. A planar image FP that is an image displayed on the screen 16 can be observed.

  As a result of the determination in step SB2, if flg is “1” and the image data is an image to be stereoscopically projected, it is recorded in the image data together with “flg = 1” as described above. The amount of movement of the structure 27 is read and acquired (step SB5). Thereafter, according to the read movement amount, the motor driver 44 is controlled to drive the motors 25 and 26, and the gear shafts 19 and 20 are rotated forward to move the structure 27 to the stereoscopic projection position (step SB6). ).

  Here, the stereoscopic projection position of the structure 27 is a position where the bulging portion 28 of the structure 27 is in pressure contact with the elastic screen 16 as shown in FIG. Therefore, in the state of this three-dimensional projection position, as shown in the figure, the elastic screen 16 bulges and deforms toward the observation surface 18 with the press-contact of the bulging portion 28, and the reserve tank 14 has the liquid 31 inside. The seat 30 is in a state of being elastically deformed inward due to the negative pressure generated in the reserve tank 14.

  Therefore, in the present embodiment, since the reserve tank 14 that stores the liquid 31 is provided, the elastic screen 16 does not bulge and deform toward the observation surface 18 due to the press-contact of the bulging portion 28, but the inside of the case 11. Therefore, it is possible to prevent the inconvenience that the air gap is generated.

  Then, if the structure 27 has reached the stereoscopic projection position, a movement completion notification is output to the projector 7 (step SB7). Then, as described above, the control unit 72 of the projector 7 inputs the movement amount completion notification (step SA3), and starts a projection process based on the image data read out in the step SA1 (step SA4).

  Then, the projected image is projected onto the projection surface 17 of the elastic screen 16 through the transparent back surface 13, the liquid 31, and the structure 27. At this time, the elastic screen 16 is an image displayed on the elastic screen 16 bulging from the observation surface 18 side of the elastic screen 16 as shown in FIG. The stereoscopic image SP can be observed.

  Therefore, according to the present embodiment, it is possible to display the stereoscopic image SP, which is a stereoscopic image, without using a stereoscopic image display method such as a parallax barrier method that easily causes fatigue to the observer. . Therefore, the playability of the image can be enhanced without causing the player to feel tired as the screen of the game device. It is also possible to display a stereoscopic image using general image data for projection without using dedicated image data for displaying a stereoscopic image.

  Moreover, in the present embodiment, as described with reference to FIG. 4, the bulging portion 28 has a regular circular shape and a spherical shape, so that the specific portion of the elastic screen 16 does not protrude and gently. A simple curved surface. Therefore, the projected image can be three-dimensionally displayed without a sense of incongruity by the elastic screen 16 having a gentle curved surface.

  In the present embodiment, since the structure 27 is moved to a different three-dimensional projection position according to the movement amount recorded in the image data, an appropriate bulge amount corresponding to the projected image is obtained. Thus, the elastic screen 16 can be bulged to perform appropriate three-dimensional display.

In the present embodiment, the case 11 is filled with the transparent liquid 31, but the liquid 31 may not be used. Even in this case, the image can be projected onto the elastic screen 16 through the back surface 13 and the structure 24 even if there is some influence on the projected image due to refraction at the bulging portion 28 of the structure 24. it can.
Furthermore, the back surface 13 may be opened without using the liquid 31 and without using the case 11 as a box. Even in this case, the image can be projected onto the elastic screen 16 only through the structure 24, even if there is some influence on the projected image due to refraction at the bulging portion 28 of the structure 24.

(Second Embodiment)
FIG. 10 is an overall perspective view showing a second embodiment of the present invention. In the present embodiment, the rear projection display device 5 is configured by the rear projection screen 1 and the projector 7 connected to each other without using the control unit 4 used in the first embodiment. Has been. The configuration of the rear projection screen 1 is the same as that of the first embodiment.

  FIG. 11 is a circuit diagram showing an electrical configuration of the rear projection display device 5 according to the present embodiment. In the circuit diagram of the rear projection display device 5, the same parts as those of the projector 7 described above with reference to FIG. That is, the rear-projection display device 5 includes substantially the same components as the projector 7, and the motor driver 44 replaces the input / output interface 73 and the input / output connector 77 shown in FIG. It is connected to the. The motor driver 44 is connected to the motors 25 and 26 of the rear projection screen 1 to constitute an entire circuit.

  In the second embodiment having the above-described configuration, the control unit 72 of the rear projection display device 5 executes processing as shown in the flowchart of FIG. 12 based on the program stored in the ROM 721. First, image data is read from the memory card 79 at a frame rate according to the standard of the image data (step SC1). Next, it is determined whether or not the flg of the read image data is “1” (step SC2). If flg is “0” and the image data is an image to be planarly projected, it is determined whether or not the structure 27 is at the planar projection position (step SC3).

  If the structure 27 is already at the planar projection position, the process proceeds to step SC7 without performing the process of step SC4. When the structure 27 is not in the plane projection position, the motor 27 is controlled to drive the motors 25 and 26, and the gear shafts 19 and 20 are rotated in the reverse direction. (Step SC4), the process proceeds to Step SC7. Thereby, the control part 72 starts the projection process based on the image data read at the step SC1 (step SC7).

  Then, as described above, the projected image is projected onto the projection surface 17 of the elastic screen 16 via the transparent back surface 13, the liquid 31, and the structure 27. At this time, the liquid 31 is filled in the case 11, and the back surface 13, the liquid 31, and the structure 27 have substantially the same refractive index, so that the image projected from the lens 71 is not refracted. Projection onto the projection surface 17 is possible.

  As described above, when an image is projected onto the projection surface 17, the elastic screen 16 has light diffusibility. Therefore, as shown in FIG. A planar image FP that is an image displayed on the screen 16 can be observed.

  As a result of the determination in step SC2, if flg is “1” and the image data is an image to be stereoscopically projected, the image data is recorded together with “flg = 1” as described above. The movement amount of the structure 27 is read and acquired (step SC5). After that, according to the read movement amount, the motor driver 44 is controlled to drive the motors 25 and 26, and the gear shafts 19 and 20 are rotated forward to move the structure 27 to the stereoscopic projection position (step SC6). ).

  Next, a projection process based on the image data read in step SC1 is started (step SC4). Then, the projected image is projected onto the projection surface 17 of the elastic screen 16 through the transparent back surface 13, the liquid 31, and the structure 27. At this time, the elastic screen 16 is an image displayed on the elastic screen 16 bulging from the observation surface 18 side of the elastic screen 16 as shown in FIG. The stereoscopic image SP can be observed.

  Therefore, according to the present embodiment, it is possible to display a stereoscopic image SP that is a stereoscopic image without using a stereoscopic image display method such as a parallax barrier method that easily causes fatigue to the observer. Therefore, the playability of the image can be enhanced without causing the player to feel tired as the screen of the game device. It is also possible to display a stereoscopic image using general image data for projection without using dedicated image data for displaying a stereoscopic image.

  In addition, in the present embodiment, unlike the first embodiment described above, the configuration can be simplified by not using the control unit 4.

  FIG. 13 is a diagram illustrating another modified example of the structure 27. In the structure 271 shown in FIG. 5A, the bulging portion 281 is rectangular when viewed from the elastic screen 16 side, and the top surface is planar. Therefore, according to this modification, the central portion of the elastic screen 16 is rectangular and the top surface can be bulged and deformed into a flat shape by the bulging portion 281. Therefore, in the case where the image portion that is intended to generate the stereoscopic effect of the projected image is rectangular, it is possible to effectively display an image with a stereoscopic effect.

  In the structure 272 shown in FIG. 5B, the peripheral portion of the bulging portion 282 is elliptical and has a spherical shape. Therefore, according to this modification, the central portion of the elastic screen 16 can be elliptically deformed and deformed into a spherical shape by the bulging portion 281. Therefore, when the image portion that is to produce the stereoscopic effect of the projected image has an elliptical periphery and a spherical shape, an image with a stereoscopic effect can be effectively displayed.

  In the structure 273 shown in FIG. 5C, the bulging portion 283 is circular in a front view as viewed from the elastic screen 16 side, and the top surface is planar. Therefore, according to this modification, the central portion of the elastic screen 16 can be circular and the top surface can be bulged and deformed into a flat shape by the bulging portion 281. Therefore, in the case where the image portion that is to produce the stereoscopic effect of the projected image is circular, it is possible to effectively display an image with a stereoscopic effect.

  The shape of the bulging portion is not limited to that illustrated above, and other shapes can be used as appropriate.

  Further, in the embodiment, the light diffusibility is obtained by the property of the material forming the elastic screen 16, but the surface is formed with irregularities, and the elastic screen 16 is coated with transparent beads or the like. The diffusibility may be enhanced by dispersing fillers having different refractive indexes in the material 16 or by dispersing titanium oxide particles, alumina particles, or the like.

  Furthermore, in the embodiment, the motors 25 and 26 are driven in accordance with the movement amount recorded in advance in the image data to move the structure 27. However, the shape of the image is determined, and based on the determination result. The amount of movement of the structure 27 may be determined.

DESCRIPTION OF SYMBOLS 1 Rear projection type screen 4 Control unit 5 Rear projection type display apparatus 7 Projector 11 Case 12 Opening part 13 Back surface 14 Reserve tank 15 Front surface 16 Elastic screen 17 Projection surface 18 Observation surface 19 Gear shaft 20 Gear shaft 21 Through-hole 22 Waterproof seal 23 Packing 24 O-ring 25 Motor 26 Motor 27 Structure 28 Swelling part 29 Opening part 30 Sheet 31 Liquid 41 Input / output connector part 42 Input / output interface 43 Control part 44 Motor driver 71 Lens 72 Control part 73 Input / output interface 74 Image conversion part 75 Display encoder 76 Display drive unit 77 Input / output connector unit 78 Image compression / decompression unit 79 Memory card 80 Video RAM
271 structure 272 structure 273 structure FP planar image SP stereoscopic image

Claims (14)

An elastic screen having a projection surface on which an image is projected on one surface side and an observation surface for observing the image projected on the projection surface on the other surface side and having a light-transmitting property capable of elastic deformation When,
A transparent structure having a bulging portion disposed on the projection surface side of the elastic screen and bulging in the screen direction;
A planar projection position in which the structure is separated from the projection surface to maintain the elastic screen in a flat shape, and a three-dimensional projection position in which the elastic screen is bulged and deformed toward the observation surface by being pressed against the projection surface And a rear projection type screen. It said elastic screen provided on the front, at least the back surface has a box body of transparent,
2. The rear projection screen according to claim 1, wherein the structure is disposed in the box.   3. The rear projection screen according to claim 2, wherein the box is filled with a transparent liquid.   4. The rear projection screen according to claim 3, further comprising a reserve tank that communicates with the box and stores the liquid.   5. The rear projection screen according to claim 3, wherein the liquid and the structure have substantially the same refractive index.   6. The rear projection screen according to claim 1, wherein the elastic screen has light diffusibility.   The rear projection screen according to claim 1, wherein the bulging portion of the structure has a spherical shape.   The rear projection screen according to any one of claims 1 to 6, wherein the bulging portion of the structural body has a spherical shape in a peripheral portion.   The rear projection screen according to any one of claims 1 to 6, wherein the bulging portion of the structure has a rectangular shape when viewed from the elastic screen side and has a flat top surface. .   The rear projection screen according to any one of claims 1 to 6, wherein the bulging portion of the structure has an elliptical periphery and a spherical shape.   7. The rear projection screen according to claim 1, wherein the bulging portion of the structure has a circular shape when viewed from the elastic screen side and has a flat top surface. 8. . A rear projection display device comprising the rear projection screen according to any one of claims 1 to 11,
Determining means for determining whether an image projected on the projection plane side of the elastic screen is a first image type to be planarly projected or a second image type to be stereoscopically projected;
The driving unit is controlled based on the determination result by the determining unit, and when the first image type is the first image type, the structure is driven to the planar projection position, and when the second image type is the second image type. A rear projection type display apparatus comprising: a control unit that drives the structure to the stereoscopic projection position. 13. The rear projection type according to claim 12, wherein, when the image is a stereoscopic image type, the control means controls a movement amount when driving the structure according to a shape of the stereoscopic image. Display device.   14. The rear projection type display device according to claim 12, further comprising projection means for projecting an image onto a projection surface side of the screen.

Images