JP4961891B2 - Interactive rear projection television system - Google Patents

Description

  The present invention relates to an interactive rear projection television system capable of easily and accurately inputting an arbitrary position coordinate on a screen of a rear projection television by a remote operation without malfunction, and more specifically, a Fresnel center outside an image display area. The present invention relates to an interactive rear projection television system that is compatible with a thin rear projection television having a circular Fresnel lens sheet.

  A rear projection television, which is a rear projection display device, includes a transmissive screen (hereinafter referred to as a screen) that projects image light emitted from the projection device. In general, this screen diffuses the substantially parallel light and a Fresnel lens sheet for deflecting the image light projected from the projection device to the observer side into parallel light or substantially parallel light (hereinafter referred to as substantially parallel light). And a light diffusion sheet for widening the viewing angle of the image. Conventionally, a three-tube type CRT projection device in which the three primary colors are projected from different tubes has been common, but with the recent demand for digitization, high definition and compactness, LCD (Liquid Crystal) A single light source type projection apparatus (hereinafter, also referred to as “single light source projection apparatus” in the present application) using a display (DLP), a digital light processing (DLP), or the like has been used. When this single light source projection device is used, there is an advantage that a still image and a character display become clearer by the pixel display which is a feature of the single light source projection device.

  On the other hand, in such rear projection television, in recent years, an interactive television system that detects a position coordinate on a screen specified by a remote operation by an observer with a detection device and performs image processing and data processing based on the detected information. Has been developed. Common interactive television systems include touch panels and stylus pens such as those found on liquid crystal displays, but these systems allow an observer to touch an indication means such as a finger on the display screen. However, it is inconvenient when an observer who is away from a large screen tries to indicate the position on the screen, such as a rear projection television. For this reason, in a rear projection television having a large screen, an interactive television system has been proposed in which the position on the screen, which is a display screen, can be indicated from a location away from the screen.

  For example, in Patent Document 1, a plurality of persons can simultaneously input a large screen display with a pointer and project video light on a screen as a display device that can easily check the visible light output from each pointer. A projection unit that displays an image, a plurality of pointers that project input lights having different light colors from the front of the screen, a camera that shoots the screen from the back of the screen, and an image captured by the camera There has been proposed an interactive display device including an input detection unit that distinguishes which one of the plurality of pointers is a light projected by the pointer. In this interactive display device, an input operation is performed using a plurality of pointers that project visible light having different light emission characteristics. Therefore, the visible light output from each pointer can be easily distinguished, and a plurality of people can be distinguished. It is said that there is an advantage that input operation to a large screen can be performed at the same time.

  Further, for example, Patent Document 2 includes a video camera that responds to a non-visible light emitter as a pointer on a screen as a light beam projection type image display device having an input function using a pointer, There has been proposed a light beam projection type image display apparatus that generates pointer position coordinate data based on a video signal obtained from the video camera and performs drawing processing or calculation processing using the pointer position coordinate data as pointer input information. In this display device, a light emitting element that outputs infrared laser light is incorporated as a pointer for indicating the position on the screen, and the position where the infrared laser light output from the pointer hits the screen is It is detected by a sensor provided on the back of the screen. Then, the input position of the user is identified from the position, but since the infrared rays are invisible, the position can be confirmed by displaying an image at the identified position.

In Patent Documents 1 and 2 described above, the configuration of the screen constituting the display device is not described in detail, but it is considered that the screen is a general circular Fresnel lens sheet with the Fresnel center at the center of the sheet.
JP-A-8-95157 Japanese Patent Laid-Open No. 5-150753

  9 and 10 show a case where the pointer light 110 (light emitted from the pointer) from obliquely below or obliquely above is incident on the lens surface 103 and the non-lens surface 104 with respect to the circular Fresnel lens sheet 101. FIG. It is explanatory drawing of the advancing direction of light. As shown in FIGS. 9 and 10, the circular Fresnel lens sheet 101 includes a Fresnel lens surface 103 that deflects image light projected from the projection device side to the viewer side, and a non-lens surface that does not contribute to substantial deflection. The Fresnel lens sheet 102 is formed so that the Fresnel lens 102 is on the viewer side. When the pointer light 110 is applied to the screen surface having the Fresnel lens sheet 101, the pointer light 110 incident from the viewer side is displayed. Passes through the lens surface 103 and the non-lens surface 104 and is refracted toward the projection device.

  However, the diameter of the pointer light 110 is usually several millimeters (for example, 4 to 5 mm), whereas the pitch P of the Fresnel lens 102 is about 100 μm, which is one tenth of the diameter of the pointer light. The pointer light 110 incident on the Fresnel lens sheet 101 is emitted to the projection apparatus side in a state where the light refracted by the lens surface 103 and the light refracted or reflected by the non-lens surface 104 are mixed, or within the Fresnel lens sheet 101. Since it becomes stray light, even if the camera as described in Patent Documents 1 and 2 is provided on the projection device side on the back of the screen, it is actually the case that the pointing position of the pointer light 110 is accurately detected. There is a problem that is quite difficult. In addition, the arrow of the code | symbol 126 has shown the direction in which the projection apparatus is installed.

  Specifically, as shown in FIG. 9, when the pointer light 110 is incident on the Fresnel lens sheet 101 obliquely from below, a part of the pointer light 110 incident on the lens surface 103 is refracted and proceeds into the housing. The refracted light is divided into a large amount of light 111a not directed in the direction of the projection device and a small amount of light 111b directed in the direction of the projection device. On the other hand, a part of the pointer light 110 incident on the non-lens surface 104 is also refracted light and travels into the housing. It is divided into a very small amount of light 112b and stray light (not shown). In any case, when the observer indicates a predetermined position on the screen with the pointer light 110, most of the refracted light transmitted through the Fresnel lens sheet 101 is directed to a plurality of directions other than the direction of the projection device 111a, 112a, the pointer light 110 cannot be distinguished from transmitted refracted light when the pointer light 110 points to another position on the screen. As a result, the camera arranged on the viewer side determines which position the detected light is. It cannot be accurately detected whether the pointer light is pointing.

  Further, as shown in FIG. 10, when the pointer light 110 is incident on the Fresnel lens sheet 101 obliquely from above, a part of the pointer light 110 incident on the lens surface 103 is refracted and proceeds into the housing. The refracted light is divided into a large amount of light 113a not directed in the direction of the projection device and a small amount of light 113b directed in the direction of the projection device. On the other hand, of the light incident on the lens surface 103, the light that hits the non-lens surface 104 is reflected by the non-lens surface 104 and travels into the housing, but the refracted light is a lot of light 114a that does not go in the direction of the projection device, It is divided into a very small amount of light 114b directed toward the projection device and stray light (not shown). In any case, when the observer indicates a predetermined position on the screen with the pointer light 110, most of the refracted light transmitted through the Fresnel lens sheet 101 is directed to a plurality of directions other than the direction of the projection device 113a, 114a, the pointer light 110 cannot be distinguished from the transmitted refracted light when the pointer light 110 points to another position on the screen. As a result, the camera arranged on the viewer side determines which position the detected light is. It cannot be accurately detected whether the pointer light is pointing.

  Particularly in recent rear projection televisions, single light source projection devices such as LCD and DLP have been used, and further thinning of the television housing is required. Especially for thinning, the circular Fresnel is designed so that the Fresnel center is inside the sheet but outside the image display area, unlike the conventional circular Fresnel lens sheet where the center is Fresnel. A screen having a lens sheet or a circular Fresnel lens sheet having no Fresnel center in the sheet as a constituent member has been studied. When such a Fresnel lens sheet is applied by replacing it with a conventional lens sheet having a Fresnel center at the center of the sheet as applied in Patent Documents 1 and 2, particularly, the pointer light 110 is refracted on the non-lens surface 104. As a result, a lot of transmitted light becomes light directed to a plurality of directions other than the direction of the projection device, and the pointer light 110 is distinguished from transmitted refracted light when pointing to another position on the screen. There was a problem that it was easy to stop.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a thin rear projection television having a circular Fresnel lens sheet having a Fresnel center outside the image display area. It is an object of the present invention to propose a simple interactive rear projection television system in which an observer can easily and accurately input the position coordinates by remote control without malfunction.

  The present inventor has been studying an interactive thin rear projection television system that is unlikely to malfunction, using a circular Fresnel lens sheet having a Fresnel center outside the image display area. Only when it is provided on the axis line, even when the pointer light is indicated on the periphery of the screen or when the observer indicates the pointer light toward the screen from a position other than the front of the screen, the pointer light indicates The present invention has been completed by discovering that the determined position can be detected very accurately.

That is, the interactive rear projection television system of the present invention for solving the above-described problems is a circular Fresnel having a Fresnel center outside the display area where an image is displayed and a Fresnel lens on the viewer side. A transmission type screen having at least a lens sheet, and a position for detecting an indication position on the screen designated by an indication device provided on an axis of the Fresnel center and held by an observer located away from the screen A detection device, and a projection device that is provided on an axis of the Fresnel center and displays an image on a display area of the screen and forms information related to the indicated position detected by the position detection device on the screen. at least possess, the position detecting device, the said projection device scree Between, or, it characterized that you have arranged between, on the opposite side of the housing wall of the with the projection device screen.

  According to the present invention, when a circular Fresnel lens sheet having a Fresnel center outside the display area where an image is displayed and disposed so that the Fresnel lens is on the viewer side is used as a constituent member of the screen, The observer who is away from the position points the position coordinates toward the screen using the pointing device, but the pointing position is detected without error by the position detecting device provided on the axis of the Fresnel center. . This is because, in a circular Fresnel lens sheet that has a Fresnel center outside the display area where an image is displayed and is arranged so that the Fresnel lens is on the observer side, the indicator light incident on the lens surface is deflected and the Fresnel Although it always goes in the axial direction of the center, the indicator light incident on the non-lens surface is particularly greatly deflected and does not go in the axial direction of the Fresnel center, so if the position detection device is arranged on the axial line of the Fresnel center, This is because even if the light traveling in the axial direction at the center of the Fresnel is weak light with a small light quantity, it can be accurately detected as pointer light without being confused with other light. Note that light traveling in the axial direction of the Fresnel center may be weak light with a small amount of light, so if the position detection device is not arranged on the axis of the Fresnel center, the position detection device is in the vicinity of the projection device. Even if it is arrange | positioned, the weak light cannot be accurately detected as light of pointer light.

Further, according to the present invention, the position detecting device is provided on the axis of the Fresnel center, and the Fresnel lens sheet used is a circular Fresnel lens sheet having a structure having the Fresnel center outside the display area where the image is displayed. Therefore, the position detection apparatus can display the display image or the processed image on the screen without worrying about the presence of the position detection apparatus without blocking the image light projected from the projection apparatus.
Further, according to the present invention, the position detection device is disposed between the projection device and the screen or between the projection device and the housing wall on the opposite side of the screen on the Fresnel center axis. The detection device can detect the light directed in the axial direction of the Fresnel center even if it is weak light with a small amount of light without being confused with other light, and can also block the image light projected from the projection device. The display image or the processed image can be displayed on the screen without worrying about the presence of the position detection device.

  In the interactive rear projection television system of the present invention, the circular Fresnel lens sheet has a Fresnel center in the sheet, or the circular Fresnel lens sheet does not have a Fresnel center in the sheet. It is characterized by.

  According to these inventions, as a circular Fresnel lens sheet that has a Fresnel center outside the display area where an image is displayed and is arranged so that the Fresnel lens is on the viewer side, a sheet having a Fresnel center in the sheet, Alternatively, a sheet that does not have a Fresnel center in the sheet can be used. In any of these sheets, the indicator light incident on the lens surface is deflected and always goes in the axial direction of the Fresnel center, but is incident on the non-lens surface. The indicator light is particularly deflected so as not to be directed in the axial direction of the Fresnel center. Therefore, if the position detection device is arranged on the Fresnel center axis of these Fresnel lens sheets, the light directed in the axial direction of the Fresnel center is not generated. Even weak light with a small amount of light can be detected without being confused with other light.

In the interactive rear projection television system of the present invention, the position detection device is provided adjacent to or in contact with the projection device .

  In the interactive rear projection television system of the present invention, the pointing device is a device that emits at least a specific wavelength indicating light, and the position detecting device is a device that detects at least the indicating light.

  According to the present invention, the pointing device is a device that emits at least a specific wavelength indicating light, and the position detecting device is a device that detects the pointing light. Therefore, by the position detecting device that detects the signal light having the specific wavelength, Arbitrary signal processing can be performed. Note that “at least” is because the indicating device may include, for example, emitting light for a detection start signal in addition to emitting the indicating light of a specific wavelength.

  In the interactive rear projection television system of the present invention, the position detection device is a camera including a light receiving element that detects the maximum value of the indication light of the specific wavelength as the indication position.

  In the positional relationship between the projection device, the screen, and the observer, the observer is always in a position where the image light can be seen. Therefore, when viewed from the projection device, the light quantity of the instruction light emitted by the observer is small and weak due to the reverse nature of the light. Even if it is light, it will always be visible. Therefore, even if the indicator light that is incident on the lens surface of the used Fresnel lens sheet, is deflected, and is directed toward the axial direction of the Fresnel center is small in intensity, the Fresnel center is not included in the indicator light that is directed toward the axial direction. The maximum value is shown on the axis. According to the present invention, since the position detection device is a camera that detects the maximum value of the indication light of the specific wavelength as the indication position, the indication light directed in the axial direction of the Fresnel center is obtained by the camera arranged on the axis of the Fresnel center. It can be detected without being confused with other light.

  In the interactive rear projection television system of the present invention, the indication light of the specific wavelength is infrared light, and the image light projected from the projection device is configured by light shielded from the infrared light of the specific wavelength. It is characterized by being.

  According to the present invention, the indication light of the specific wavelength is infrared light, and the image light projected from the projection device is composed of light shielded from the infrared light of the specific wavelength. Thus, the indication light emitted from the indication device and the image light can be detected without confusion. As a result, the indicated position can be detected without error.

  In the interactive rear projection television system of the present invention, the indicator light of the specific wavelength is infrared light, and a cut filter for shielding the infrared light of the specific wavelength is provided between the projection device and the screen. It is characterized by.

  According to the present invention, the indicator light of the specific wavelength is infrared light, and the cut filter for shielding the infrared light of the specific wavelength is provided between the projection device and the screen. Thus, the indication light emitted from the indication device and the image light can be detected without confusion. As a result, the indicated position can be detected without error.

  In the interactive rear projection television system of the present invention, the indication light emitted from the indication device is unpolarized light, the image light projected from the projection device is polarized light, and the screen and the position detection device In the meantime, a polarizing filter that shields image light reflected by the circular Fresnel lens sheet is provided.

  According to this invention, the indication light emitted from the indication device is non-polarized light, the image light projected from the projection device is polarized light, and a circular Fresnel lens sheet is provided between the screen and the position detection device. Since the polarizing filter that shields the reflected image light is provided, the position detecting device can detect the unpolarized light emitted from the pointing device and the image light that is the polarized light without confusion. As a result, the indicated position can be detected without error.

  In the interactive rear projection television system of the present invention, the interactive rear projection television system includes a control unit that converts and stores the indicated position detected by the position detection device into an image position on the screen, and the projection device stores the projection device. It is a device that displays a locus of a designated position in synchronization with the image.

  According to this aspect of the invention, the projection device displays the locus of the indicated position stored by the control unit in synchronization with, for example, a moving image. For example, the projection device can accurately grasp the range in which the image is processed or can capture the image as a background. It is possible to superimpose an image to be designated and operate it.

  In the interactive rear projection television system of the present invention, the interactive rear projection television system includes a storage device that converts and stores the indicated position detected by the position detection device into an image position on the screen, and the projection device stores the projection device. Position information is imaged and displayed together with the image at a predetermined position on the screen.

  According to the present invention, the projection device images the position information stored in the storage device and displays it together with the image at a predetermined position on the screen. Point out according to the motion of the moving image to display the image, display the range of the indicated position in the moving image as a still image, or superimpose the instruction signal separately in the moving image It is possible to perform image display such as capturing an image of a certain moment within a specified range to be watched and enlarging or displaying a still image. Here, “point out” means that, for example, when a moving ball is specified, the ball is automatically tracked.

  According to the interactive rear projection television system of the present invention, a circular Fresnel lens sheet having a Fresnel center outside the display area where an image is displayed and arranged so that the Fresnel lens is on the viewer side is used as a component of the screen. When used as an observer, a viewer away from the screen uses a pointing device to indicate the position coordinates toward the screen. The pointing position is a position detection provided on the axis of the Fresnel center. It can be detected without error by the device. In the interactive rear projection television system of the present invention, the position detecting device is provided on the axis of the Fresnel center, and the Fresnel lens sheet used has a structure having the Fresnel center outside the display area where the image is displayed. Since it is a circular Fresnel lens sheet, the position detection device does not block the image light projected from the projection device, and displays the display image or processed image on the screen without worrying about the presence of the position detection device. can do.

  The interactive rear projection television system of the present invention that exhibits such effects is preferable as an interactive rear projection television system that allows an observer to input arbitrary position coordinates on a screen easily and accurately by remote control without malfunction. Can be used. In particular, it can be preferably used in a rear projection display device with a clear display such as a rear projection television system using a single light source projection device such as an LCD or DLP.

  Hereinafter, an interactive rear projection television system of the present invention (hereinafter sometimes simply referred to as a “PTV system”) will be described with reference to the drawings. The technical scope of the present invention is not limited to the following embodiments.

  FIG. 1 is a configuration diagram showing an example of the PTV system of the present invention. In the PTV system 1 of the present invention, a transmissive screen 10 is disposed on the surface of the housing 3 on the observer side, and a rear surface on which a projection device 40 for projecting the image light 5 is disposed on the rear surface side of the screen 10. More specifically, it is a projection type image display device, and has a Fresnel center 2 outside a display area A on which an image is displayed and is arranged so that a Fresnel lens 12 (see FIGS. 2 and 3) is on the viewer side. The transmissive screen 10 having at least the circular Fresnel lens sheet 11 and the pointing device 20 which is provided on the axis L of the Fresnel center 2 and is held by the observer M located away from the screen 10 is instructed. A position detection device 30 that detects the indicated position S on the screen 10 and an image displayed on the display area A of the screen 10 and detected by the position detection device 30. The information relating to have been instructed position S has at least a projection device 40 to be formed on the screen 10. Reference numeral 50 represents a control unit. Below, the structure of the PTV system 1 of this invention is demonstrated in detail in order.

(screen)
As shown in FIG. 1, the screen 10 constituting the PTV system 1 of the present invention is a transmissive type capable of transmitting the image light 5 projected from the projection device 40 arranged on the back side thereof to the viewer side. It is a screen. The screen 10 has a display area A where the image light 5 is projected and an image is displayed, and a non-display area B where the image light 5 is not projected and an image is not displayed. The screen 10 includes at least a circular Fresnel lens sheet 11 for deflecting the image light 5 expanded as diffused light from the projection device 40 in the direction of the viewer. The screen 10 also includes a light diffusing sheet 16 for expanding the viewing angle by diffusing the deflected image light in the horizontal direction or the vertical direction as needed, and a support sheet for supporting the light diffusing sheet 16. (Not shown) A front sheet (not shown) having a function of preventing external light such as a fluorescent lamp from being reflected or reflected on the front surface of the screen may be provided.

  2 and 3 are a schematic perspective view (A) and a cross-sectional view (B) showing an example of a circular Fresnel lens sheet constituting the screen 10, respectively. The circular Fresnel lens sheet 11 (hereinafter also referred to as “Fresnel lens sheet 11”) has a Fresnel center 2 outside the display area A, that is, in the non-display area B, and includes a lens surface 13 and a non-lens surface 14. Reference numeral 12 denotes a lens sheet disposed on the viewer side. More specifically, the circular Fresnel lens sheet 11 shown in FIGS. 2 and 3 is common in that it has the Fresnel center 2 outside the display area A, but FIG. 2 shows the Fresnel center 2 having the Fresnel center 2 in the sheet. A lens sheet 11A is shown, and FIG. 3 shows a Fresnel lens sheet 11B having no Fresnel center 2 in the sheet. The PTV system 1 of the present invention has a structural feature in that the Fresnel lens sheet 11 having such a form is used.

In the circular Fresnel lens sheet 11, the lens surface 13 constituting the Fresnel lens 12 has an angle θ _{1 with} respect to the flat surface 15 on the projection device 40 side in order to deflect the image light 5 projected from the projection device 40 toward the viewer. Increases gradually from the Fresnel center 2 continuously or stepwise. Specifically, although depending on the specifications of the Fresnel lens sheet 11, the angle θ ₁ usually increases gradually in the range of about 0 ° to 70 ° as the distance from the Fresnel center 2 increases. In addition, although the pitch P of the lens surface of the Fresnel lens 11 may be constant or may be changed, it is usually formed at a constant pitch within a range of 0.5 mm to 0.01 mm. On the other hand, the non-lens surface 14 of the Fresnel lens 12 is an essential surface for forming a lens surface 13 of the Fresnel lens 12, typically, the angle theta ₂ is approximately about against the flat surface 15 of the projection device 40 side 65 It is formed within the range of ° to about 90 °.

  Such a circular Fresnel lens sheet 11 may have various conventionally known technical elements as necessary. For example, either a light diffusing agent or a dye may be included in the sheet, or a non-reflective layer or a mat layer may be provided on the surface on the projection device 40 side or the surface on the observer side. Further, the above-described light diffusion sheet 16, support sheet, and front sheet provided on the screen 10 as necessary may have various conventionally known technical elements such as a light diffusion agent and a dye. May be included or provided. Further, the light diffusion sheet 16 may be one in which a cylindrical lens is formed on one or both sides, one in which a so-called fly-eye lens is formed, or one in which a black stripe layer or a colored layer is formed. . In addition, each sheet includes, for example, a non-glare layer, an antireflection layer, a low reflection layer, a hard coat layer, an antistatic layer, an antiglare layer, a contamination prevention layer, a polarizing filter layer, an electromagnetic wave shielding layer, and the like depending on the purpose. It may be provided.

(Indicator, position detector)
Next, the instruction device 20 and the position detection device 30 will be described. As shown in FIG. 1, the pointing device 20 is a device possessed by an observer M who is away from the screen 10 and is a device for pointing a predetermined position on the screen 10. On the other hand, as shown in FIG. 1, the position detection device 30 is a device corresponding to an instruction signal such as an instruction light 21 emitted from the instruction device 20, and indicates an indicated position on the screen 10 indicated by the instruction device 20. This is a device for detecting S. The position detection device 30 is a device corresponding to the type of instruction signal issued from the instruction device 20.

  As the indication device 20, for example, a device that emits indication light 21 having a specific wavelength can be used. As the indication light 21 having the specific wavelength, visible light mainly included in the image light 5 is not suitable, and light in a specific wavelength range among infrared light and ultraviolet light other than visible light can be used. it can. As a light source capable of emitting infrared light, for example, a GaAs type light emitting diode capable of generating infrared light of about 800 nm to 1000 nm, a GaAs compound semiconductor laser diode, or the like can be used.

  When the pointing device 20 that emits the pointing light 21 having such a specific wavelength is used, the position detecting device 30 has a light receiving element corresponding to the pointing device 21, and the pointing light 21 detected by the light receiving element is used as the image light 5 or the like. It can be identified without being confused with other lights.

  Further, the pointing device 20 may be a device that generates non-polarized light. In this case, if the image light 5 projected from the projection device 40 is polarized light, a position detection device 30 in which a polarization filter 33 is provided between the screen 10 and the position detection device 30 is used as shown in FIG. Thus, the indication light 21 made of non-polarized light emitted from the indication device 20 can be detected without being confused with the image light 5 projected from the projection device 40. The polarizing filter 33 is preferably a polarizing plate attached to the position detection device 30, and specifically, is preferably disposed on the front surface of the light receiving element included in the position detection device 30.

  Further, a polarizing filter 42 can be provided at a location where the image light 5 is projected from the projection device 40. As the polarizing filter 42 at this time, a right polarizing plate that passes only clockwise polarized light (referred to as right polarized light) or a left polarizing plate that allows transmission of only counterclockwise polarized light (referred to as left polarized light) can be used. By attaching the polarizing filter 42 to the projection device 40, the image light 5 can be converted into polarized light. At this time, if the right polarizing plate is attached to the projection device 40, the image light 5 that has passed through the right polarizing plate is projected onto the screen 10 as light having only the right polarized light. The light reaching the detection device 30 also has only right polarization. At this time, if a left polarizing plate that allows only left polarized light to pass through is attached to the front surface of the position detection device 30, light having only right polarization is cut by the left polarizing plate. not enter. On the other hand, the indicator light 21 from the indicator device 20 is usually non-polarized light including right polarized light and left polarized light. Therefore, the indicator light 21 emitted from the indicator device 20 passes through the screen 10 and the indicator light The left polarized light of 21 passes through the left polarizing plate in front of the position detection device 30 and is detected by the position detection device 30. As a result, when the image light 5 from the projection device 40 and the instruction light 21 from the pointing device 20 are projected onto the screen 10 and these lights are reflected or transmitted and reach the position detecting device 30, Only the instruction light 21 from the apparatus 20 is detected.

  In the above case, even if the left polarizing plate is used instead of the right polarizing plate mounted on the projection device 40, the same applies except that the relationship between the polarized light and the polarizing plate is reversed left and right. When the image light 5 from the pointing device 20 and the pointing light 21 from the pointing device 20 are projected, and these lights are reflected or transmitted and reach the position detecting device 30, only the pointing light 21 from the pointing device 20 is detected. Will be. Thus, by attaching different polarizing filters (polarizing plates) to the projection device 40 and the position detection device 30, the image light 5 from the projection device 40 is not incident on the position detection device 30. Only the indicator light 21 enters. In this way, the position detection device 30 can detect only the indication light 21 from the indication device 20 from which unnecessary light is omitted.

  Since the configuration and operation of the polarizing plate are already known, a detailed description thereof will be omitted in the present application, but an outline will be described below. That is, the right polarizing plate is composed of a linear polarizing plate that transmits only linearly polarized light and a quarter-wave plate that converts the linearly polarized light into right polarized light. Specifically, among the image light 5 emitted from the projection device 40, only linearly polarized light passes through the linearly polarizing plate, and the linearly polarized light that has passed through is converted into right polarized light by the quarter wavelength plate, and the screen 10 Projected on. On the other hand, the left polarizing plate is composed of a ¼ wavelength plate that converts right polarized light into linearly polarized light, and a linear polarizing plate in which a transmission axis is arranged so as not to pass this linearly polarized light. Here, the transmission axis is an axis unique to the linear polarizing plate, and is an axis through which only linearly polarized light having a vibration plane in the same direction as the axial direction can pass through the linear polarizing plate. The light that enters the quarter-wave plate includes right-polarized light that exits the projection device 40 and is reflected by the screen 10, and light that includes polarized light in all directions from the pointing device 20 (unpolarized light). The right polarized light reflected by the screen 10 and the right polarized light in the light including the polarized light in all directions include the linearly polarized light A and the linearly polarized light A by the quarter wavelength plate. It can be changed to light B, respectively. Since the vibration plane of the linearly polarized light A and the transmission axis of the linearly polarizing plate are orthogonal, the linearly polarized light A cannot pass through the linearly polarizing plate. And finally the light obtained is the light which passed the linearly polarizing plate among the light B containing the linearly polarized light A.

  The linear polarizing plate can be realized by a transparent plastic material coated with a Gran-Thomson prism, a Nicol prism, or a dichroic dye material. The quarter-wave plate can be realized by a quartz plate, a barium titanate crystal, or the like. The thickness of the quarter-wave plate is determined according to the wavelength, but the wavelength serving as a reference for determining the thickness is the wavelength of a representative color out of the light output from the projection device 40, the output The upper limit value and lower limit value of the wavelength of the emitted light may be averaged or a weighted average considering the amount of light to be output.

  Further, in order to change the linearly polarized light to the right polarized light, it is necessary to arrange the transmission axis of the linearly polarizing plate and the fast axis of the quarter wavelength plate so as to have a certain relationship. The quarter wavelength plate has two directions of vibration planes that are orthogonal to each other so that linearly polarized light incident on the quarter wavelength plate can pass through the quarter wavelength plate without changing its polarization state. The fast axis refers to an axis having the same direction as the direction in which the light propagation speed is faster among the two directions. In the above description, the right polarizing plate and the left polarizing plate are combined. However, the present invention is not limited to this, and linear polarizing plates whose transmission axes are orthogonal to each other may be combined. Furthermore, in the above description, it has been described that circularly polarized light is generated using a quarter wave plate, but elliptical polarized light may be generated using another wave plate.

  In the above description, the number of pointing devices 20 is not mentioned, but a single pointing device 20 may be used, or a plurality of pointing devices may be used. When a plurality of instruction devices 20 are used, the frequency and intensity of light from the instruction device 20 are made different from each other, or the polarization state of light from the instruction device 20 is made to be different. It is possible to detect the designated position by the device 20.

  For example, when two indicator devices that emit infrared light are used, one indicator device V is provided with a left polarizing plate that transmits only left polarized light, and the other indicator device W is provided with a right that transmits only right polarized light. If a polarizing plate is provided, infrared light having left polarized light is projected from one indicator device V, and infrared light having right polarized light is projected from the other indicator device W. In front of the position detection device 30, a variable polarizing plate that can select polarized light to be transmitted among right polarized light and left polarized light is installed. The variable polarizing plate is composed of a quarter-wave plate, a half-wave plate, and a linear polarizing plate. The half-wave plate is composed of TN (Twisted Nematic) liquid crystal, and voltage When no voltage is applied, the direction of the vibration plane of the incident linearly polarized light is rotated 90 degrees, but when a predetermined voltage is applied, the direction of the vibration plane of the incident linearly polarized light is not changed. .

  When left polarized light from one indicating device V and right polarized light from the other indicating device W are incident on the variable polarizing plate, the vibration plane of the light after passing through the half-wave plate is applied with voltage. Sometimes the light from one indicating device V is in the vertical direction and therefore passes through the variable polarizer and the linear polarizer. At this time, since the vibration plane of the light from the other pointing device W is in the horizontal direction, neither the variable polarizing plate nor the linear polarizing plate passes through. On the other hand, the reverse occurs when no voltage is applied, and the light from one indicating device V does not pass through the variable polarizing plate, but the light from the other indicating device W passes through the variable polarizing plate. In this way, even when a plurality of indicating devices are used, it is possible to cope with the polarization state of light from each indicating device differently.

  Next, the position detection device 30 will be described in detail. The position detection device 30 is a device corresponding to an instruction signal (for example, an instruction light 21) emitted from the instruction device 20, and is a device for detecting an instruction position S on the screen 10 instructed by the instruction device 20. is there. When the pointing device 20 is a device that emits at least a specific wavelength indicating light 21, the position detecting device 30 is also a device that detects at least the indicating light 21. This is because, in addition to emitting indicator light 21 having a specific wavelength, for example, 20 may include emitting light for a detection start signal. The position detection device 30 can detect the indicator light 21 having a specific wavelength, and the PTV system 1 of the present invention can perform arbitrary signal processing.

  For example, when the pointing device 20 is a device that emits infrared light as the pointing light 21, if the position detection device 30 has a light receiving element capable of detecting infrared light, the red indicated on the screen 10 The position of outside light can be identified.

  Further, for example, when the image light 5 is polarized light and the instruction light 21 from the instruction device 20 is non-polarized light as described above, a polarizing plate is provided on the front surface of the light receiving element as illustrated in FIG. The provided position detection device 30 is used. The position detection device 30 can identify the indication light 21 from the indication device 20 and the video light 5 projected from the projection device 40 without confusion, and the indication position indicated by the indication device 20 is incorrect. Can be detected.

  Of the light receiving elements corresponding to the instruction light 21 having a specific wavelength, as a light receiving element when infrared light is applied as the instruction light 21, for example, a light receiving element such as a photodiode such as CdS or a phototransistor is preferably used. The position detection device 30 having such a light receiving element is preferably a camera that can detect the maximum value of the indication light 21 having a specific wavelength as the indication position.

  The indicator light that is incident on the lens surface 13 of the Fresnel lens sheet 11 and is deflected toward the axis L of the Fresnel center 2 (see reference numerals 111b and 112b in FIG. 10 and reference numerals 113b and 114b in FIG. 11)). The maximum value is shown on the axis L of the Fresnel center 2, but the position detection device 40 is a camera that detects the maximum value of the indication light 21 having a specific wavelength as the indication position. With the arranged camera, it is possible to detect the instruction light traveling in the direction of the axis L of the Fresnel center 2 without being confused with other light (for example, image light). In order to recognize the maximum value of the indication light 21 having a specific wavelength as the indication position, it is desirable to provide a device that performs O / E conversion on the light received by the light receiving element.

  In addition, when the indication light 21 having a specific wavelength emitted from the indication device 20 is infrared light, as shown in FIG. 5, a cut filter that shields infrared light having the specific wavelength between the projection device 40 and the screen 10. 43 can also be provided. With such a configuration, since the infrared light component having a specific wavelength is cut from the image light 5 projected from the projection device 40, the image light 5 that has passed through the cut filter 43 and the instruction light 21 from the instruction device 20. And can be distinguished. As a result, when an infrared light component having a specific wavelength is included in the light detected by the position detection device 30, the position of the infrared light becomes the indication position S indicated by the indication device 20. Examples of the cut filter 43 that shields infrared light having a specific wavelength include an interference filter, a dielectric multilayer filter, and a colored glass filter.

  FIG. 6 is a layout diagram showing the configuration of the PTV system 1 of the present invention when the circular Fresnel lens sheet 11A shown in FIG. 2 is used as a constituent member of the screen 10, and FIG. 7 is a circular Fresnel lens shown in FIG. FIG. 2 is a layout diagram showing a configuration of the PTV system 1 of the present invention when a sheet 11B is used as a constituent member of a screen 10. In the present invention, the position detection device 30 is provided on the axis L of the Fresnel center 2 as shown in FIGS. 6 and 7. If the position detection device 30 is provided on the axis L of the Fresnel center 2, even between the projection device 40 and the screen 10, between the projection device 40 and the housing wall 6 on the opposite side of the screen 10. However, in any case, it is preferably provided at a position close to the projection device 40, and more preferably provided adjacent to or in contact with the projection device 40.

  In the present invention, the position detection device 30 is provided on the axis L of the Fresnel center 2, but the circular Fresnel lens sheet 11 used in the present invention has a Fresnel center in a non-display area B that is outside the display area A in which an image is displayed. 2 and the Fresnel lens 12 is arranged on the viewer side. Therefore, when an observer M who is away from the screen 10 indicates the position coordinates on the screen 10 with the indicating light 21 using the pointing device 20, as shown in FIGS. The indicator light 21 incident on the lens is deflected and travels in the axial direction of the Fresnel center 2, but the indicator light 21 incident on the non-lens surface 14 is particularly greatly deflected and does not travel in the axial direction of the Fresnel center 2. If the position detection device 30 is arranged on the axis L of the Fresnel center 2, even if the amount of light traveling in the axial direction of the Fresnel center 2 is small, it can be detected without being confused with other light. Note that light traveling in the axial direction of the Fresnel center 2 refers to, for example, reference numerals 111b and 112b in FIG. 10 and reference numerals 113b and 114b in FIG.

  Since the Fresnel center 2 is the lens center of the circular Fresnel lens sheet 11, the projection device 40 is usually disposed on the axis of the Fresnel center 2. By doing so, the image light 5 projected from the projection device 40 is deflected to the viewer side in the front direction of the screen 10, and the viewer can see the image projected on the screen 10 as a good image. it can. In the present invention, since the position detection device 30 is provided on the axis L of the Fresnel center 2, it proceeds in the opposite direction to the image light 5 such as the indication light 21 from the indication device 20 emitted from the observer M. As shown in FIGS. 10 and 11, there is also light (111 a, 112 a, 113 a, 114 a) that does not go on the axis L of the Fresnel center 2, but the indicator light 21 that is refracted by the lens surface 13 is strong or weak. Contains light (111b, 112b, 113b, 114b) that goes to any position on the axis of the Fresnel center 2 at least. As a result, if the position detection device 30 is arranged on the axis L of the Fresnel center 2, the indication light 21 from the indication device 20 emitted from the observer M is detected separately from other light such as outside light and stray light. can do.

  In addition, it is particularly preferable to provide the position detection device 30 adjacent to or in contact with the projection device 40. The reason is that the position where the projection device 40 is provided is a light emission source of the image light 5 to be projected, and that Since the projection device 40 is provided on the axis L of the Fresnel center 2, the axis of the Fresnel center 2 is used as the installation position of the position detection device 30 that detects the indicator light 21 that travels in the opposite direction to the image light 5. A position on L and as close as possible to the projection device 40 is most desirable. Then, if the position detection device 30 provided on the axis L of the Fresnel center 2 is as close as possible to the projection device 40, the shape of the indication light 21 detected by the position detection device 30 is further reduced to a substantially circular shape. Since it becomes small and becomes circular shape with many light quantities, it is preferable. On the other hand, even if it is on the axis L of the Fresnel center 2, when it moves away from the projection device 40, the shape of the indication light 21 detected by the position detection device 30 becomes a substantially circular shape, and a slightly blurred circular shape. Become a shape. However, since the position detection device 30 is provided on the axis L of the Fresnel center 2 in any case, the center position of the circle often has the most light amount, although the shape is large or small. The position represents the position coordinate indicated by the indication light 21 from the indication device 20 emitted from the observer M, and the indication position S can be detected without error.

  On the other hand, when the position detection device 30 is not provided on the axis L of the Fresnel center 2, the shape of the indication light 21 detected by the position detection device 30 is unlikely to be a circular shape and is like an elliptical shape. Therefore, the center position cannot be easily determined, and the position coordinates indicated by the pointing light 21 emitted from the pointing device 20 emitted from the observer M cannot be easily determined.

  As described above, in the present invention, since the circular Fresnel lens sheet 11 having the Fresnel center 2 is used outside the display area where the image is displayed, the position detection device 30 is provided on the axis L of the Fresnel center 2. However, the position detection device 30 does not block the image light 5 projected from the projection device 40. As a result, the display image or the processed image projected on the screen 10 by the image light 5 projected from the projection device 40 is not affected by the position detection device 30 provided on the axis L of the Fresnel center 2. Is displayed.

(Projection device)
Next, the projection device 40 will be described. The projection device 40 is a device that displays an image in the display area A of the screen 10 and forms information on the designated position S detected by the position detection device 30 on the screen 10. The projection device 40 of the circular Fresnel lens sheet 11 used is used. It is provided on the axis of the Fresnel center 2. As the projection device 40, a single light source projection device such as LCD (Liquid Crystal Display) or DLP (Digital Light Processing) that can meet the recent demands for digitization, high definition and compactness can be preferably used. A conventional three-tube CRT can also be used. The single light source projection apparatus is often small and can be easily provided on the axis of the Fresnel center 2. However, since the three-tube CRT is large, the middle tube is usually the Fresnel center 2. It is preferable to provide it so that it may be on the axis line.

  Further, the projection device 40 may project the image light 5 directly toward the screen 10 as shown in FIGS. 6A and 7A, or FIG. 6B and FIG. As shown in FIG. 7B, the image light 5 may be reflected by the reflection mirror 4 and projected onto the screen 10. In any case, the diffusion angle θ of the image light 5 projected from the projection device 40 tends to be larger due to the recent demand for thinning of the PTV system. The device 40 is preferably used.

  The projection device 40 is preferably a device that displays the locus of the designated position S stored in the control unit 50 in synchronism with the image, or the position information stored in the hard disk 53 in the control unit 50 is imaged and screened. It is desirable that the device display an image together with an image at a predetermined position on the screen. As a result, for example, it is possible to accurately grasp the range in which the image is processed, or to superimpose and operate an image that is designated by capturing the image as a background. In this way, in order to display the locus of the designated position in synchronization with the image, for example, when the designated position cannot be accurately designated due to camera shake (for example, a predetermined key is displayed by projecting a keyboard). In the case), it is necessary to perform processing for recognizing that the designated position is at the center as the locus plane, or processing for recognizing that the designated position is at the position where the number of passages of the designated position is the largest.

  Further, the projection device 40 has a storage device that stores position information related to the indicated position detected by the position detection device 30, images the position information, and displays it together with the image at a predetermined position on the screen 10. A device is desirable. This is particularly effective for various processing of moving images, for example. For example, an arbitrary position is pointed out according to the movement of the moving image to display an image, or the range of the designated position in the moving image is displayed as a still image. Or by superimposing an instruction signal separately to capture an image of a certain range within a specified range to be watched in a moving image, and to display an image such as a still image display. it can. Here, “point out” means that, for example, when a moving ball is specified, the ball is automatically tracked.

(Control system)
Next, a control system for the entire PTV system of the present invention will be described. The basic configuration of the PTV system 1 of the present invention shown in FIG. 1 includes a screen 10, a position detection device 30 that detects a pointing position S indicated on the screen 10 by the pointing device 20, and a detection by the position detection device 30. A control unit 50 that processes the processed position signal, converts the processed position signal into an image signal as necessary to obtain image information, and sends the image information to the projection device 40 as a video signal in addition to the original image information; And a projection device 40 that projects the video signal from the control unit 50 onto the screen 10 as the video light 5.

  In such a PTV system 1, the control unit 50 is connected to the position detection device 30 and the projection device 40, receives the position signal detected by the position detection device 30, performs image processing on the position signal as necessary, and performs projection. The image is emitted from the device 40 and displayed on the screen 10. As specific modes of the control unit 50, for example, (1) the indication position S detected by the position detection device 30 is converted into image information and stored, and the projection device 40 uses the locus of the indication position S as an image. Alternatively, the position information related to the indicated position S detected by the position detection device 30 may be stored in the storage device, and then the position information may be imaged by the projection device 40. The image may be displayed together with the image at a predetermined position on the screen 10. As the storage device at this time, the control unit 50 may be provided, or the projection device 40 may be provided.

  FIG. 8 is a configuration diagram illustrating an example of hardware of the control unit 50. As illustrated in FIG. 8, the control unit 50 controls the entire PTV system, and includes a CPU 51, a position information control unit 31 that converts an instruction signal detected by the position detection device 30 into image information, and position information. Image information control unit 41 that converts image information converted by control unit 31 into an image signal, main storage unit 52, hard disk unit 53, CPU 51 / position information control unit 31 / image information control unit 41 / main storage unit 52 / the hard disk unit 53 is connected to the bus 54. Note that the position information control unit 31 may be included in the control unit 50 as illustrated in FIG. 8 or may be included in the position detection device 30. Similarly, the image information control unit 41 may be included in the control unit 50 as illustrated in FIG. 8 or may be included in the projection device 40. Such a configuration is an example of the PTV system of the present invention, and is not limited to the illustrated configuration.

  The main storage unit 52 is a storage unit when the processing program of the control unit 50 executed by the CPU 51 is executed, and also functions as a storage unit when the processing program of the position information control unit 31 and the image information control unit 41 is executed. .

  The hard disk 53 stores position information of the indicated position S detected by the position detection device 30 and image data obtained by converting the position information into image information formed on the screen 10. 20 is a device that stores the position information specified by 20 and identified by the position information control unit 31, the identification information of the pointing device 20, and the like. The hard disk 53 stores processing programs of the control unit 50, the position information control unit 31, and the image information control unit 41 executed by the CPU 51. The stored information is stored in the main storage unit 52 when the processing program is executed. Forwarded to

  The position information control unit 31 receives an instruction from the CPU 51, A / D converts the detection signal detected by the position detection device 30, and sends the obtained digital data to the main storage unit 52.

  The image information control unit 41 receives image information formed on the screen 10 from the CPU 51 and outputs the image information to the projection device 40 based on the image information.

  The position detection device 30 and the projection device 40 may be operated while being synchronized, or may be operated without being synchronized. In the case of operating in synchronization, it is desirable to take an image with the position detection device 30 during the vertical blanking period of the projection device 40.

  After receiving the position information from the position information control unit 31, the control unit 50 executes a process according to the position information. For example, when a plurality of menus are displayed on the screen and the designated position S designates any one menu on the screen, it is interpreted that the menu at the designated designated position S is selected, and Process to open the menu. As an execution result, data for generating an image for displaying the opened menu is sent to the image information control unit 41. The image information control unit 41 generates a predetermined image signal according to this data, and sends the generated image signal to the projection device 40. The sent image signal is converted into video light 5 in the projection device 40, and the video light 5 is projected onto the screen 10.

  As described above, the PTV system of the present invention is a general home television system, for example, expanding a favorite part in a program or converting a person in a play into another person previously input. In addition to improving the performance of the image, such as performing an instruction as an input function of the game, the signal transmitting means (infrared rays, electromagnetic waves, specific wavelengths of the specific wavelength) instead of the position specifying means using the mouse which is a PC terminal It can be used as an indicator light or the like.

  Further, in industrial use used as a large screen, the screen is a large screen in particular, and therefore the size of the projection point of the indication light 21 from the indication device 20 may be too small, and the position detection device 30 detects it. In this case, there is a concern that it has been thought that the resolution is insufficient and is erroneously detected. However, in the PTV system 1 of the present invention, such a concern is unnecessary, and the indication position S can be accurately detected. .

  Further, in the PTV system of the present invention, the indicated position S can be accurately detected, and therefore, it can be preferably used for, for example, a presentation system, an electronic conference system, a control system, a monitoring system, a plant control system, and the like.

  When applied to a presentation system, a predetermined image is displayed, and various functions are added by performing image processing according to an instruction position S of a presenter (corresponding to the observer M in the above). Can do. More specifically, for example, it is possible to enlarge / reduce or move only a certain portion of an image, not only a still image but also a moving image. As a result, an unprecedented presentation can be performed when a presenter located at a position away from the large-screen screen gives an instruction with an instruction light or the like.

  When applied to an electronic conference system, it is possible to display a predetermined image and display information according to the designated position of the chairperson and chairperson (corresponding to the observer in the above). More specifically, for example, it becomes possible to display the back data of the information on the indicated position, and as a result, the moderator or the chair located at a position away from the screen of the large screen indicates with the instruction light or the like, An unconventional electronic conference can be held. Note that “back data” means related data such as original numerical data in a diagram created by, for example, a table creation software.

  When applied to a control system or monitoring system, display a predetermined image and collect information on the control or monitoring target according to the indicated position of the controller or the monitor (corresponding to the observer in the above). And the subsequent instructions and control work can be performed based on the information. As a result, an unprecedented control can be performed by the controller at a position away from the large-screen screen using an instruction light or the like.

It is a block diagram which shows an example of the PTV system of this invention. It is a schematic cross section which shows an example of the circular Fresnel lens sheet which comprises a screen. It is a schematic cross section which shows another example of the circular Fresnel lens sheet which comprises a screen. It is explanatory drawing which shows the form which provided the polarizing filter between the screen and the position detection apparatus. It is explanatory drawing which shows the form which provided the cut filter which shields the infrared light of a specific wavelength between a projection apparatus and a screen. FIG. 3 is a layout diagram illustrating a configuration of a PTV system when the circular Fresnel lens sheet illustrated in FIG. 2 is used as a constituent member of a screen. FIG. 4 is a layout view showing a configuration of a PTV system when the circular Fresnel lens sheet shown in FIG. 3 is used as a constituent member of a screen. It is a block diagram which shows an example of the hardware of a control part. It is explanatory drawing of the advancing direction of the light when the instruction | indication light from diagonally downward is made to inject into a lens surface and a non-lens surface with respect to the circular Fresnel lens sheet in which a Fresnel center does not exist in a substantial image display area. It is explanatory drawing which shows explanatory drawing of the advancing direction of the light at the time of making the indicator light from diagonally upper direction inject into a lens surface and a non-lens surface with respect to the circular Fresnel lens sheet which does not have a Fresnel center in a substantial image display area. is there.

Explanation of symbols

1 Interactive rear projection television system (PTV system)
2 Fresnel center 3 Housing 4 Reflecting mirror 5 Video light 6 Housing wall 10 Screen 11 Circular Fresnel lens sheet 12 Fresnel lens 13 Lens surface 14 Non-lens surface 15 Flat surface 16 Light diffusing sheet 20 Indicator device 21 Indicator light 30 Position detector DESCRIPTION OF SYMBOLS 31 Position detection control part 32 Position information control part 33 Polarization filter 40 Projection apparatus 41 Image information control part 42 Polarization filter 43 Cut filter 50 Control part 51 CPU
52 Main memory 53 Hard disk A Display area B Non-display area L Fresnel center axis M Observer S Instructed position P Lens surface pitch θ ₁ Angle of lens surface to flat surface θ ₂ Angle of non-lens surface to flat surface θ Diffusion Corner

Claims (11)

A transmissive screen having at least a circular Fresnel lens sheet that has a Fresnel center outside the display area where an image is displayed and is arranged so that the Fresnel lens is on the viewer side
A position detection device that is provided on the axis of the Fresnel center and detects an indicated position on the screen indicated by an indication device possessed by an observer away from the screen;
A projection device that is provided on the axis of the Fresnel center, displays an image on a display area of the screen, and forms information related to the indicated position detected by the position detection device on the screen;
At least have a,
The position detecting device, between the screen and the projection device, or interactive rear projection television is characterized that you have arranged between, on the opposite side of the housing wall of the with the projection device screen system.   The interactive rear projection television system according to claim 1, wherein the circular Fresnel lens sheet has a Fresnel center in the sheet.   2. The interactive rear projection television system according to claim 1, wherein the circular Fresnel lens sheet does not have a Fresnel center in the sheet. The interactive rear projection television system according to claim 1, wherein the position detection device is provided adjacent to or in contact with the projection device .   5. The interactive type according to claim 1, wherein the pointing device is a device that emits at least a specific wavelength of pointing light, and the position detecting device is a device that detects at least the pointing light. Rear projection television system.   6. The interactive rear projection television system according to claim 5, wherein the position detection device is a camera including a light receiving element that detects the maximum value of the indication light of the specific wavelength as the indication position.   The instruction light of the specific wavelength is infrared light, and the image light projected from the projection device is configured by light shielded from the infrared light of the specific wavelength. Interactive rear projection television system described in 1.   The indicator light of the specific wavelength is infrared light, and a cut filter for shielding the infrared light of the specific wavelength is provided between the projection device and the screen. 6. The interactive rear projection television system according to 6.   The indication light emitted from the indication device is non-polarized light, the image light projected from the projection device is polarized light, and is reflected by the circular Fresnel lens sheet between the screen and the position detection device. 5. The interactive rear projection television system according to claim 1, further comprising a polarizing filter for shielding the image light. A controller that converts and stores the indicated position detected by the position detection device into an image position on the screen;
The interactive rear projection television system according to claim 1, wherein the projection device is a device that displays a locus of an instruction position stored in the control unit in synchronization with the image. A storage device for converting and storing the indicated position detected by the position detection device into an image position on the screen;
The interactive type according to claim 1, wherein the projection device images the position information stored in the storage device and displays the image together with the image at a predetermined position on the screen. Rear projection television system.

Images