JP5208293B2 - POSITION DETECTION DEVICE, POSITION DETECTION SYSTEM, VIDEO DISPLAY DEVICE, AND VIDEO DISPLAY SYSTEM - Google Patents

Description

  The present invention relates to a position detection device that detects a position where an indicator that indicates a display screen indicates the display screen, and a video display device that uses the position detection device.

  2. Description of the Related Art There is a video display device that allows a user to specify a screen on which video is displayed using a pointer, and to draw characters, run a game, and the like. Such a video display device includes a position detection device that detects a position instructed by a user by imaging light projected on a screen from an indicator used by the user with an imaging unit.

  In the conventional position detection device, a light emitting element is provided at the tip of an indicator that indicates the screen, and light projected on the screen from the light emitting element is captured by a video camera provided on the back of the screen. The indication position of the indicator on the screen is detected (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 5-150901 (paragraph 0007, FIG. 1)

  In a place where a plurality of video display devices are installed close to each other such as a game center, light is projected from an indicator other than the indicator to be originally used, such as an indicator of the adjacent video display device. There is a case. In this case, the image display apparatus on which the light is projected detects the position where the light is projected as the designated position, even though the light is projected from an indicator other than the indicator that should be used originally. . Therefore, there is a problem that it is erroneously detected that the position on the screen is instructed even though the user of the video display apparatus has not instructed the position.

  The present invention has been made to solve the above problems, and a position detection device and a position detection system capable of preventing erroneous detection due to light being projected from an indicator other than the indicator to be originally used. An object is to provide a video display device and a video display system.

  A position detection apparatus according to the present invention is a position detection apparatus that detects an instructed position on a screen on which an image is displayed, and an indicator that projects light onto the screen, and unique ID information of the indicator Storage means for storing the output, output means for outputting a light emission timing signal indicating a unique timing at which the indicator projects light, following the unique ID information recorded by the storage means, and the indicator The light is projected from the indicator based on the image of the screen imaged by the imaging unit and the imaging unit that images the screen on which the light is projected from the indicator in synchronization with the timing of projecting the light. Calculating means for calculating a position on the screen, wherein the indicator is the light emission timing signal inputted following the unique ID information from the output means. Those for projecting light on the screen at a specific timing based on.

  According to the present invention, since the indicator projects light at a specific timing, and the imaging means images the screen in synchronization with the specific timing, light is emitted from the indicator other than the indicator that should be originally used to the screen. Even when projected, the timing at which light is projected does not coincide with the timing at which the screen is imaged. Therefore, it is possible to prevent erroneous detection due to light being projected from an indicator other than the indicator to be originally used.

  In addition, since the indicator projects light based on the light emission timing signal input from the output means following the unique ID information, the indicator that is not the indicator that should be originally used is output from the output means. Even if the light emission timing signal is received, light is not projected onto the screen based on the light emission timing signal. For this reason, it is possible to prevent a malfunction in which the screen is instructed by an indicator that is not an indicator that should be used.

It is a block diagram of the image display apparatus by embodiment of this invention. It is a block diagram of the indicator 2 by embodiment of this invention. It is a wave form diagram for demonstrating the timing of light emission and imaging by embodiment of this invention. It is a figure which shows the position of the light detected by the imaging means 3 by embodiment of this invention. It is a figure which shows an example of the coordinate calculation in the image processing means 4 by embodiment of this invention. It is a block diagram of the image display apparatus by other embodiment of this invention. It is a block diagram of the indicator 32 by other embodiment of this invention. It is a wave form diagram for demonstrating the timing of light emission and imaging by other embodiment of this invention. It is a wave form diagram for demonstrating the timing of light emission and imaging by other embodiment of this invention. It is a block diagram of the image display apparatus by other embodiment of this invention. It is a block diagram of the image display apparatus by other embodiment of this invention.

Embodiment 1 FIG.
Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a configuration diagram of a video display device configured using a position detection device according to an embodiment of the present invention. In FIG. 1, the video display device includes a projection device 12, a display screen 11, an external interface 30, a computer 31, and a position detection device 1, and the position detection device 1 includes synchronization signal generation means 6, invisible light. The projection unit 5, the imaging timing generation unit 13, the imaging unit 3, and the image processing unit 4 are provided, and separately include indicators 2A and 2B (hereinafter, the indicators are collectively referred to as the indicator 2). ing.

  The computer 31 controls the video information held therein and outputs the controlled video information to the projection device 12 as a video signal. The video information is controlled by application software installed in the computer 31 based on position information input from an external interface 30 such as a LAN (Local Area Network) or a USB (Universal Serial Bus). The video signal output from the computer 31 includes a vertical synchronization signal, a horizontal synchronization signal, and an RGB image signal.

  The projection device 12 is a rear projector that projects an image on the display screen 11. The projection device 12 projects an image on the back surface 11 b side of the display screen 11 based on the image signal output from the computer 31. The image projected on the back surface 11 b is imaged on the display surface 11 a of the display screen 11, and the image is displayed on the display surface 11 a side of the display screen 11. Further, the projection device 12 outputs a synchronization signal indicating a blanking period during which the projection device 12 does not project an image to the synchronization signal generation unit 6.

As a method of the projection device 12, for example, a DLP ^™ (Digital Light Processing) method of projecting an image by reflecting light from a light source (not shown) using DMD ^™ (Digital Micromirror Device) can be used.

In the projection of the image by the projection device 12, there are a period for projecting an image (outputting an effective image) and a blanking period for not projecting an image (no output of an effective image). If the projection method is determined, the period can be calculated in advance. For example, in the case of the DLP ^TM method, the blanking period can be calculated based on the rotation of the color wheel.

  The position detection device 1 detects an arbitrary position on the display screen 11 designated by the indicator 2 used by the user as position information, and outputs the position information to the computer 31 via the external interface 30. Hereinafter, each component of the position detection device 1 will be described.

  The synchronization signal generation means 6 generates a light emission synchronization signal for causing the indicator 2 to emit light with reference to the synchronization signal output from the projection device 12. The light emission synchronization signal has a trigger for causing the indicator 2 to emit light during a blanking period in which no image is projected from the projection device 12. The generated light emission synchronization signal is output to the invisible light projection unit 5 and the imaging timing signal generation unit 13.

  The invisible light projection unit 5 generates a light emission timing signal at a timing when a trigger for causing the indicator 2 to emit light is generated based on the light emission synchronization signal generated by the synchronization signal generation unit 6, for example, a pulse of invisible light such as infrared rays. Is projected onto the display screen 11.

  The indicator 2 receives the invisible light output from the invisible light projection means 5 and analyzes the light emission timing signal from the received invisible light. And according to the analyzed light emission timing signal, the light of a red, green, or blue wavelength is projected on the display screen 11 from the display surface 11a side at the specific timing.

  The imaging timing signal generation unit 13 generates an imaging timing signal that specifies the timing at which the imaging unit 3 images the display screen 11 based on the light emission synchronization signal input from the synchronization signal generation unit 6, and outputs the imaging timing signal to the imaging unit 3. To do. The imaging timing signal is a signal having a trigger that is synchronized with the generation of the trigger for causing the indicator 2 to emit light in the light emission synchronization signal or delayed by several μs. The trigger is a trigger that causes the imaging unit 3 to image the display screen 11.

  The imaging unit 3 images the light projected from the indicator 2 from the back surface 11 b side of the display screen 11 based on the imaging timing signal output from the imaging timing generation unit 13. The image pickup means 3 is housed and installed in a housing (not shown) so as to be close to the projection apparatus 12, and the front face of the projection apparatus 12 and the front face of the image pickup means 3 are displayed as shown in FIG. It is installed so as to be arranged in a plane substantially parallel to the screen 11. Thereby, it becomes easy to include the range in which the projection device 12 projects an image on the display screen 11 in the imaging range of the imaging means 3. In addition, the imaging unit 3 does not block the optical path through which the projection device 12 projects an image on the display screen 11.

  The imaging means 3 is provided with an optical filter (not shown) for distinguishing light according to the wavelength. After the light projected from the indicator 2 is distinguished for each wavelength and converted into an electrical signal, image processing is performed. Output to means 4. As a general method for distinguishing the light projected from the indicator 2 for each wavelength and converting it into an electrical signal, a color camera having RGB three-color filters in the imaging means 3 may be used. However, it is required that the light emission wavelength of the indicator 2 and the RGB filter of the color camera match each other and that the color overlap is small.

  The image processing means 4 calculates the two-dimensional coordinates on the display screen 11 of the light projected from the indicator 2 based on the image picked up by the image pickup means 3 and outputs it to the external interface 30 as position information. The calculation method will be described later. When there are a plurality of indicators, each indicator is discriminated by inputting an electrical signal of light distinguished for each wavelength from the imaging means 3.

  Next, the configuration of the indicator 2 will be described. FIG. 2 is a configuration diagram of the indicator 2 according to the embodiment of the present invention. As shown in FIG. 2, the indicator 2 includes a light receiving unit 26, a light emitting unit 21, a switch 22, a driver 23, a lens 24, a synchronization conversion unit 27, and a battery 25, which are housed in a housing 200. ing.

  The light receiving unit 26 receives the invisible light projected from the invisible light projection unit 5 and converts the received light into an electrical signal. The synchronous conversion unit 27 detects a light emission timing signal from the electrical signal input from the light receiving unit 26 and outputs a control signal for controlling the driver 23 to the switch 22 based on the detected light emission timing signal.

  The light emitting unit 21 includes three types of light emitting diodes 21a, 21b, and 21c having different wavelengths. The light emitting diode 21a is red (660 nm), the light emitting diode 21b is green (550 nm), and the light emitting diode 21c is blue (440 nm). Each emits light. The switch 22 changes the wavelength of light projected from the indicator 2 by selecting and switching one or a plurality of light emitting diodes to emit light among the light emitting diodes 21a, 21b, and 21c. Further, the control signal input from the synchronous conversion unit 27 is output to the driver 23 as it is.

  The driver 23 drives the light emitting unit 21 according to the control signal output from the synchronous conversion unit 27, thereby causing one or more light emitting diodes selected by the switch 22 to emit light. The lens 24 is provided at the tip of the indicator 2 in order to efficiently project the light output from one or a plurality of light emitting diodes. The battery 25 is a power source for driving the indicator 2. Note that a switch (not shown) that can be pushed down by the user pressing the indicator 2 against the screen 11 is provided at the tip of the indicator 2 and emits light only while the switch is pressed down. The diode is configured not to emit light.

  In the embodiment of the present invention, the indicator 2A and the indicator 2B are used, and the indicator 2A is set to project the red light by selecting the light emitting diode 21a by operating the switch 22. Further, the indicator 2B is set to project the green light by selecting the light emitting diode 21b by operating the switch 22. At this time, the wavelengths of light projected by the indicator 2A and the indicator 2B are made not to overlap.

  Next, the light emission timing of the indicator 2 will be described with reference to FIG. 3, (a) is a vertical synchronizing signal of the video signal input from the computer 31 to the projection device 12, (b) is an image output of the video signal input from the computer 31 to the projection device 12, and (c) is a video. The light output of the projection device 12 based on the signal, (d) is a synchronization signal indicating a blanking period, (e) is a light emission synchronization signal output from the synchronization signal generating means 6, and (f) is an image pickup device 3 on the display screen 11. (G) is an output of the non-visible light projection means 5.

  When a video vertical synchronization signal and an image signal are input from the computer 31 to the projection device 12 at timings such as those shown in FIGS. 3A and 3B, the projection device 12 is connected to the display screen 11. The image signal is converted into an optical signal and output at a timing as shown in FIG. As shown in FIG. 3C, the optical output of the projection device 12 includes an effective image area in which a video is projected and a blanking period in which no video is projected. A synchronization signal (FIG. 3 (d)) indicating the ranking period is output. The synchronization signal in FIG. 3D takes either “H” or “L” value, the period of “H” value indicates the period during which the image is projected, and the period of “L” value. A blanking period in which no image is projected is shown.

  The synchronization signal generation means 6 generates the light emission synchronization signal shown in FIG. 3E based on the synchronization signal input from the projection device 12, and outputs it to the invisible light projection means 5 during the blanking period in which the video signal is not projected. To do. The timing at which the trigger for causing the indicator 2 to emit light in the light emission synchronization signal can be immediately after the value of the synchronization signal is changed from “H” to “L”, or after a predetermined time has elapsed since the change. You can also. The non-visible light projection means 5 displays the light emission timing signal shown in FIG. 3G with non-visible light at a specific timing during the blanking period based on the light emission synchronization signal input from the synchronization signal generation means 6. Projects onto the screen 11.

  The light receiving unit 26 of the indicator 2 receives the non-visible light pulse projected from the non-visible light projecting unit 5, converts it into an electrical signal, and outputs it to the synchronization converting unit 27. The synchronous conversion unit 27 detects a light emission timing signal from the electrical signal input from the light receiving unit 26, and sends a control signal for driving the light emitting diodes 21 a to 21 c based on the detected light emission timing signal via the switch 22 to the driver 23. Output to. The control signal is a signal in which a trigger for driving the driver 23 is generated while a trigger for causing the indicator 2 to emit light is generated in the light emission timing signal.

  The driver 23 performs control so that one of the light emitting diodes 21 a to 21 c in the light emitting unit 21 is driven only during a period in which a trigger for driving the driver 23 is generated in the control signal input from the synchronous conversion unit 27. . Since the trigger in the control signal is generated during the blanking period, the light emitting diodes 21a to 21c emit light during the blanking period during which the effective image is not output during the period in which the image is projected on the display screen 11 from the projection device 12. To be controlled.

  FIG. 4 is a diagram showing the positions of the indicator 2A and the indicator 2B detected by the imaging means 3 according to the embodiment of the present invention. As shown in FIG. 4, when the light emitted from the indicator 2A and the indicator 2B is simultaneously projected onto the display surface 11a of the display screen 11, the light 20A of the indicator 2A (wavelength 660 nm) and the indicator 2B (wavelength 550 nm) The light 20B is projected on the back surface 11b side of the display screen 11.

  In the imaging means 3, the light of the indicator 2A and the indicator 2B is distinguished by an optical filter provided therein, and only the light 20A and the light 20B are detected as images as shown in FIG. Then, the imaging unit 3 images the light 20A and the light 20B according to the imaging timing signal of FIG. 3 (f) input from the image processing unit 4. Note that the imaging timing signal is such that the trigger that causes the imaging unit 3 to image the display screen 11 is generated 10 μs after the trigger for causing the indicator 2 to emit light in the light emission synchronization signal, or the indicator 2 emits light. At the same time as the effective period of the trigger to be ended, a trigger for the imaging means 3 to image the display screen 11 is generated. As a result, it is possible to perform imaging in accordance with the light emission of the indicator 2. The imaging unit 3 converts the captured image into an electrical signal and outputs it to the image processing unit 4.

  The image processing means 4 separates the electrical signal SR of the light 20A and the electrical signal SB of the light 20B from the electrical signal input from the imaging means 3, and the indicators 2A and 2B indicated on the display screen 11 The indicated position is obtained by calculating each independently. FIG. 5 is a diagram illustrating a horizontal synchronization signal, a vertical synchronization signal, and an output signal of the imaging device 3. An example of coordinate calculation for detecting the positions of the indicator 2A and the indicator 2B in the x and y coordinate directions shown in FIG. 4 in the image processing unit 4 will be described below with reference to FIG.

In FIG. 5, (a) is a horizontal synchronizing signal, (b) is a signal for detecting the red light 20A projected from the indicator 2A, and (c) is the position of the blue-green light 20B projected from the indicator 2B. The signal which detects is shown. In (a), the starting point SH _O of the horizontal synchronizing signal corresponds to the horizontal left end (x = 0) on the display screen 11, and the end point SH _e is the horizontal right end (x = X) on the display screen 11. ). By the time tR _H of the light 20A of the indicator 2A shown from SH _O to (b) until SR _H initially detected, it is possible to calculate the horizontal position of the light 20A on the display screen 11 (Rx). Similarly, the horizontal position (Bx) of the light 20B on the display screen 11 can be calculated from the time tBH from SH 2 _O to SB _H for detecting the light 20B of the indicator 2B shown in (c).

5, (d) is a vertical synchronization signal, (e) is a signal for detecting red light 20A projected from the indicator 2A, and (f) is a position of blue-green light 20B projected from the indicator 2B. The signal which detects is shown. In (d), the starting point SV _O of the vertical synchronization signal corresponds to the lower end (y = 0) on the display screen 11, and the end point SV _e corresponds to the upper end (y = Y) on the display screen 11. The vertical position (Ry) of the light 20A on the display screen 11 can be calculated from the time tR _H from SV _O to SR _V for first detecting the light 20A of the indicator 2A shown in (e). Similarly, the vertical position (By) of the light 20B on the display screen 11 can be calculated from the time tB _V from SV _O to SB _V for detecting the light 20B of the indicator 2B shown in (f). .

  The two-dimensional position information of the indicator 2A and the indicator 2B calculated by the image processing means 4 is input to the computer 31 via the external interface 30. The computer 31 controls the video information held based on the input position information. The video controlled by the computer 31 is displayed by projecting it on the display screen 11 in real time.

  As described above, according to the video display apparatus according to the first embodiment, the indicator 2 projects light at a specific timing based on the light emission timing signal, and the imaging unit 3 determines the imaging timing signal determined by the light emission timing signal. The indicator 2 captures the display screen 11 in accordance with the timing at which the indicator 2 projects light. Therefore, erroneous detection due to the imaging means 3 imaging the screen 11 on which light from other than the indicator 2 is projected is detected. Can be prevented.

  Further, according to the video display device according to the first embodiment, the front surface of the camera provided in the imaging unit 3 and the front surface of the projection device 12 are arranged in the same plane substantially parallel to the display screen 11. Since it is installed, the image pickup means 3 does not block the optical path of the light projected from the projection device 12 onto the display screen 11, and the quality of the image projected on the display screen 11 is not deteriorated.

  Further, according to the video display device according to the first embodiment, the indicator 2 projects light during the blanking period in which no effective video is projected from the projection device 12, and the imaging unit 3 projects the light of the indicator 2. Since the display screen 11 is imaged in synchronization with the image, the imaging means 3 captures an image in which the light projected from the indicator 2 on the back surface 11 b side of the display screen 11 interferes with the image projected from the projection device 12. Can prevent false detection.

  In addition, according to the video display device according to the first embodiment, since it is possible to select and project light of three different wavelengths on the indicator 2, a plurality of indicators 2 can be used simultaneously. In addition, by adjusting the switch 22 so that the wavelengths of light projected from the respective indicators 2 do not overlap, the indication positions of the respective indicators 2 can be calculated simultaneously and independently.

  In addition, according to the video display device according to the first embodiment, the imaging unit 3 distinguishes and converts the light of a predetermined wavelength projected from the indicator 2 into an electrical signal. The light projected on the screen 11 is distinguished, and the indication position of the indicator 2 can be accurately detected without misrecognizing outside light other than the indicator 2.

  Further, according to the video display device according to the first embodiment, the indicator 2 drives the light emitting diodes 21a to 21c only during the period in which the trigger is generated in the light emission timing signal, so that power consumption can be reduced. The life of the battery 25 can be extended.

Embodiment 2. FIG.
In a place where a plurality of video display devices are arranged close to each other, light is projected onto the display screen 11 from an indicator other than the indicator to be originally used, such as the indicator 2 of the adjacent video display device. There is. Even if light is projected from an indicator other than the indicator to be originally used, the timing at which the light is projected and the timing at which the display screen 11 is imaged are not the same in most cases, and this is not a problem. However, when an indicator other than the indicator to be originally used projects light onto the video display device based on the light emission timing signal output from the adjacent video display device, the timing and display of the light projection The timing at which the screen 11 is imaged coincides. Therefore, in the following, the indicator identifies the light emission timing signal input to the indicator, and when the input light emission timing signal is not output from the corresponding video display device, light is not projected. The video display device thus described will be described.

  FIG. 6 is a block diagram of a video display apparatus configured using a position detection apparatus according to another embodiment of the present invention. In FIG. 6, the same or corresponding components as those in FIG. The video display apparatus of FIG. 6 is different from FIG.

  The ID storage means 7 has an infrared receiving means (not shown) and is specific to the indicator 32 transmitted by infrared communication from the indicator 32A and the indicator 32B (hereinafter collectively referred to as the indicator 32) in FIG. ID information is received and stored. Further, the ID storage unit 7 outputs the stored ID information to the invisible light projection unit 52.

  The synchronization signal generation means 62 in the present embodiment generates a light emission synchronization signal for causing the indicator 32 to emit light with reference to the synchronization signal output from the projection device 12. The generated emission synchronization signal is output to the invisible light projection unit 52 and the imaging timing signal generation unit 13. Further, the synchronization signal generation unit 62 outputs the synchronization signal output from the projection device 12 to the invisible light projection unit 52 as it is.

  The invisible light projection unit 52 in the present embodiment outputs an ID identification signal based on the synchronization signal input from the synchronization signal generation unit 62 and the ID information input from the ID storage unit 7. In addition, a light emission timing signal is output based on the light emission synchronization signal input from the synchronization signal generation means 62. The output of the ID identification signal is performed during a period when a video based on the video signal is projected, and the output of the light emission timing signal is performed during a blanking period during which no video is projected.

  The indicator 32 in the present embodiment receives invisible light output from the invisible light projection means 52 and analyzes ID information from the received invisible light. Only when the analyzed ID information matches the ID information registered in the indicator 32, the light having a predetermined wavelength is displayed at a specific timing in accordance with the light emission timing signal analyzed from the subsequently received invisible light. Projection is performed on the display screen 11 from the 11a side.

  Next, the configuration of the indicator 32 will be described. FIG. 7 is a configuration diagram of the indicator 32 according to the embodiment of the present invention. In FIG. 7, the same or corresponding components as those in FIG. The indicator 32 in FIG. 7 is different from the indicator 2 in FIG. 2 in that the indicator 32 includes an ID identification unit 28 and an ID information output unit 29.

  In the present embodiment, the light receiving unit 36 receives the invisible light projected from the non-visible light projecting unit 52, converts the light into an electrical signal, and outputs the electrical signal to the ID identifying unit 28. The ID identifying unit 28 detects ID information from the electrical signal output from the light receiving unit 36 and determines whether or not it matches ID information registered in an ID storage unit (not shown) in the indicator 32. If the detected ID information matches the recorded ID information, a control signal is output to the switch 22.

  The ID information output unit 29 is a communication circuit such as an infrared ray, and transmits ID information stored in an ID storage unit (not shown) in the indicator 32 to the ID storage unit 7 in the position detection device 1. To do. The transmission of ID information is performed when an ID information transmission switch (not shown) is turned on. This ID information transmission switch, for example, allows the user to place the indicator 32 in the indicator folder (not shown) of the video display device. It shall be turned on when it is stored.

  Next, the output of the invisible light projection unit 52 will be described with reference to FIG. In FIG. 8, the same signals as those in FIG. 7, (h) the output of the invisible light projection means 52 is different from the output of the (g) invisible light projection means 5 in FIG. 3 in that it includes ID information.

  The user needs to register the ID information in the indicator 32 in the ID storage means 7 in advance before using the indicator 32. When the user stores the indicator 32 in an indicator folder (not shown) of the video display device, ID information is transmitted from the ID information output unit 29 of the indicator 32 to the ID storage means 7. ID information is assigned to each indicator, and the amount of information is, for example, 8 bits.

  The ID storage means 7 sequentially stores the ID information (8 bits) of each indicator 32 and outputs the ID information to the invisible light projection means 52. For example, the ID storage unit 7 stores the ID information of the indicator 32A as 1 and the ID information of the indicator 32B as 2.

  When the user uses the indicator 32, the ID storage means 7 outputs the ID information stored in the non-visible light projection means 52. The invisible light projection unit 52 generates an ID identification signal based on the ID information output from the ID storage unit 7 and the synchronization signal output from the synchronization signal generation unit 62, converts the ID identification signal into a pulse of invisible light, and displays it. Project onto the screen 11. In addition, a light emission timing signal is generated based on the light emission synchronization signal output from the synchronization signal generating means 62 and similarly projected onto the display screen 11.

  As shown in FIG. 8 (h), the non-visible light projection means 52 outputs a light emission timing signal synchronized with the imaging timing in the period “L” where the value of the synchronization signal in FIG. 8 (d) indicates the blanking period. Then, control is performed so that only the registered ID identification information is output in the period “H” in which the value of the synchronization signal in FIG.

  Here, as an example of ID assignment in the ID identification signal, the output of the non-visible light projection unit 52 when the ID information is 8 bits and any value of 00h to 7Fh is assigned to each indicator in hexadecimal notation will be described. To do.

  For example, when the ID information of the indicator 32A is 01 and the ID information of the indicator 32B is 02, the non-visible light projection unit 52 indicates “1” and “2” indicated by double frames in FIG. The ID identification signal is output during this period, and IDs are registered in the ID storage means 7 during the periods “0”, “3”, and “7F” indicated by single frames (00h in hexadecimal, and from 03h to 7Fh). The ID identification signal is not output as it is not.

  In the indicator 32, the non-visible light pulse projected from the non-visible light projection means 52 is received by the light receiving unit 36. The invisible light pulse received by the light receiving unit 36 is converted into an electric signal and output to the ID identifying unit 28. The ID identification unit 28 determines whether or not the ID information included in the ID identification signal illustrated in FIG. 8H matches the ID information registered in the indicator 32. When it is determined that the ID information matches, a control signal for driving the light emitting diodes 21a to 21c is output to the driver 23 by using the subsequently input light emission timing signal as a trigger.

  As described above, according to the video display device according to the second embodiment, the invisible light projection unit 52 outputs the light emission timing signal following the unique ID information of each indicator 32 stored in the ID storage unit 7. Since the indicator 32 projects the light based on the light emission timing signal that is subsequently input only when the input ID information matches the ID information registered in the indicator 32. Even in a place where a plurality of video display devices are arranged close to each other, the imaging means 3 of one video display device images the display screen 11 on which light is projected from the indicator 32 of another video display device. Can prevent false detection.

  In this embodiment, the invisible light projection means 5 has 128 ID information output timings as shown in FIG. 8 (h), and among these, the IDs registered in the ID storage means 7 are prepared. Although control was performed so that an ID identification signal is output only for a period, it is not necessary to prepare output timing of ID information for all IDs, and only ID identification information registered in the ID storage means 7 is transmitted. There is no problem even if the control is performed.

  In this embodiment, communication from the ID information output unit 29 to the ID storage unit 7 is performed by infrared rays or the like, but the same effect can be obtained by using other wireless communication units such as RFID.

Embodiment 3
In the case where the projector 12 is configured to time-divide light output from a single light source using a three-plate color wheel of R, G, and B, the effective area of the image output from the projector 12 is the color wheel The data is output in units of R, G, and B. Hereinafter, the light emission timing of the indicator 32 and the imaging timing of the imaging unit 3 when the output of the projection device 12 is divided into R, G, and B will be described with reference to FIG. In FIG. 9, the same signals as those in FIG.

  When the color wheel is rotated at a triple speed of the video signal, the effective area of the video output from the projection device 12 is output after being divided into nine as shown in FIG. There are nine blanking periods during the period. In FIG. 9 (i), R, G, and B shown for each effective image area indicate which of R, G, and B the image output in the effective image area corresponds to.

  For example, when controlling the indicator 32 and the imaging means 3 in synchronization with the second blanking period output by the projection device 12, the synchronization signal output from the projection device 12 is as shown in FIG. A value “L” is output between the effective image region indicating the first R and the effective image region indicating the first G, and a value “H” is output during the other periods.

  The synchronization signal generation means 62 outputs the light emission synchronization signal shown in FIG. 9K to the invisible light projection means 52 and the imaging timing signal generation means 13 during the period when the value of the synchronization signal is “L”. As shown in FIG. 9 (m), the non-visible light projection means 52 sequentially outputs the ID identification information of the indicator 32 during the period when the value of the synchronization signal is “H”, and the value of the synchronization signal is “L”. In a certain period, the light emission timing signal “OUT” is output based on the light emission synchronization signal. The indicator 32 emits light based on the light emission timing signal. The imaging timing signal generation unit 13 generates an imaging timing signal shown in FIG. 9L based on the light emission synchronization signal, and the imaging unit 3 images the display screen 11 based on the imaging timing signal.

  As described above, according to the video display device according to the third embodiment, the projection video device 12 outputs the synchronization signal indicating the blanking period between the R, G, and B image outputs. Even in the case where the time 12 processes the light output from the single light source 12, the light emission timing signal can be projected within the blanking period during which no video is projected.

  In the above description, the projection device 12 performs the time division processing on the light output from the single light source using the R, G, B three-plate color wheel. However, the light having the R, G, B wavelength is used. It is also possible to output an image using a laser light source that outputs.

  In the above description, light emission and imaging are performed in synchronization with the second blanking period. However, the synchronized blanking period may be any of the nine blanking periods.

Embodiment 4
In the above description, the configuration of one video display device has been described. However, by constructing a video display system using a plurality of video display devices connected via a network, the light emission timing between the multiple video display devices in the video display system. Can be shared.

  FIG. 10 is a block diagram relating to a video display device including a position detection device according to another embodiment of the present application. 10, the same or corresponding components as those in FIG. 6 are denoted by the same reference numerals and description thereof is omitted.

  The computer 310 in FIG. 10 has connection means for connecting to an external computer, and is connected to the computer 310 in another video display device that is arranged in proximity. The computer 310 receives the light emission synchronization signal from the synchronization signal generation means 63 in FIG. 10 and transmits it to the computer in the other video display device. Since the light emission synchronization signal is similarly transmitted from the computer 310 in another video display device, the light emission synchronization signal can be shared among a plurality of video display devices.

  In addition, the computer 310 generates a synchronization signal so that the light emission timing in the light emission synchronization signal received from the computer 310 in the other video display device and the light emission timing in the light emission synchronization signal input from the synchronization signal generation unit 63 do not match. The light emission synchronization signal input from the means 63 is changed and output to the synchronization signal generation means 63. The synchronization signal generation unit 63 outputs the light emission synchronization signal input from the computer 310 to the invisible light projection unit 52 and the imaging timing signal generation unit 13.

  As described above, according to the video display device according to the fourth embodiment, light is emitted from the indicator 32 of another video display device by setting the light emission timings among the plurality of video display devices so as not to coincide with each other. It is possible to prevent malfunction caused by imaging the projected display screen 11.

  In the present embodiment, the light emission synchronization signal is shared, but the synchronization signal output from the projection device 12 may be shared.

Embodiment 5
In the fourth embodiment, the light emission timing is shared among a plurality of video displays in the video display system, but the ID information of the indicator can also be shared.

  FIG. 11 is a block diagram relating to a video display device including a position detection device according to another embodiment of the present application. 11, parts that are the same as or correspond to those in FIG. 10 are given the same reference numerals, and descriptions thereof are omitted.

  A computer 311 in FIG. 11 has connection means for connecting to an external computer, and is connected to a computer 311 in another video display device arranged close to the computer 311. The computer 311 inputs the ID information from the ID storage unit 73 in FIG. 11 and transmits it to the computer in another video display device. Similarly, the ID information is transmitted from the computers in the other video display apparatuses, so that the ID information can be shared among a plurality of video display apparatuses.

  Further, the computer 311 changes the ID information input from the ID storage unit 73 so that the ID information received from the computer in the other video display device and the ID information input from the ID storage unit 73 do not match. And output to the ID storage means 73.

  The ID storage unit 73 stores the ID information input from the computer 311 and outputs it to the invisible light projection unit 53. The invisible light projecting means 53 projects the ID information input from the ID storage means 73 onto the indicator 42A and the indicator 42B (hereinafter collectively referred to as the indicator 42) in FIG. 11 by invisible light. The indicator 42 registers the ID information projected from the non-visible light projection means 53 in its ID storage means (not shown) in the indicator 42 as its own ID information. Registration of ID information by the indicator 42 is performed in advance before the user uses the indicator 42.

  As described above, according to the video display device according to the present embodiment, the instruction of the other video display device is set by setting the ID information so as not to match the indicator of the other video display device arranged in proximity. It is possible to prevent malfunction caused by imaging the display screen 11 on which light is projected from the body.

In the above description, the DLP ^TM method is used as the method of the projection device 12, but a 3LCD method or an LCOS method can also be used.

  In the above description, the light emitting diodes 21a to 21c are driven by pressing the indicator against the display screen 11. However, a light source having high directivity such as a laser beam is mounted on the indicator so that the indicator is separated from the display screen 11. If the display screen 11 can be irradiated with light in a spot manner, the position can be indicated without pressing the indicator against the display screen 11.

  In the above description, it is assumed that the indicator can emit at least one of red, blue, and green, and the imaging unit 3 distinguishes the light output from the indicator according to the wavelength. By increasing the types of wavelengths of light projected from the indicator, and simultaneously increasing the types of wavelengths that can be distinguished, the imaging means 3 can increase the number of indicators that can be used simultaneously. In addition, by simultaneously lighting the light emitting diodes of the indicators, it is possible to increase the number of indicators that can be used simultaneously.

  In the embodiment of the present invention, two indicators are used, but one or three or more indicators may be used. When more than three indicators are used, individual indicators can be distinguished by selecting two or more light emitting diodes at the same time.

  Note that, in the above description, the synchronization signal generation means 6 and the synchronization signal generation means 62 are the light emission synchronization signals generated by the trigger for causing the indicator to be generated immediately after the value of the synchronization signal is switched from “H” to “L” or after a predetermined period. However, the trigger for causing the indicator to emit light may be any trigger that is generated in synchronization with the blanking period of the video signal output from the projection device 12.

  In the above description, invisible light such as infrared rays is projected from the invisible light projecting unit 5 or the invisible light projecting unit 52, but the same effect can be obtained by transmitting a light emission timing signal or ID identification information using radio waves or the like. Play.

  In the above description, the indication position of the indicator is detected as a two-dimensional coordinate position on the display screen 11. However, the position may be detected as a one-dimensional coordinate of only the X axis or the Y axis. .

  In the above description, the image processing unit 4 calculates the position at which the light is projected based on the time from the start of the horizontal synchronization signal and the vertical synchronization signal to the first detection of the output signal. An output signal may be detected, and a position where light is projected may be calculated based on a plurality of detection signals. According to this, even when light is distributed with a spread on the screen, the position of the light can be detected more accurately.

  In the above description, the ID identification signal is output during the period when the value of the synchronization signal is “H”. However, if the light emission timing signal is output during the period when the value of the synchronization signal is “L”, The ID identification signal may be output during a period when the value of the synchronization signal is “L”.

  In the above description, the ID storage unit 5 includes the non-visible light receiving unit (not shown). However, the computer 31 includes the non-visible light receiving unit and outputs the ID information received from the indicator to the ID storage unit 5. You may do it.

  2A, 2B, 32A, 32B, 42A, 42B Indicator, 3 Imaging means, 4 Image processing means, 5, 52, 53 Invisible light projection means, 6, 62, 63 Synchronization signal generation means, 7, 73 ID storage means , 13 Imaging timing signal generation means, 11 display screen, 12 projector, 30 external interface, 31, 310, 311 computer, 21 light emitting unit, 22 switch, 23 driver, 24 lens, 25 battery, 26 light receiving unit, 28 ID identification Part, 29 ID information output part, 200 case.

Claims (4)

In a position detection device for detecting an indicated position on a screen on which an image is displayed,
An indicator that projects light onto the screen;
Storage means for storing unique ID information of the indicator;
An output means for outputting a light emission timing signal indicating a specific timing at which the indicator projects light following the unique ID information recorded by the storage means;
Imaging means for imaging the screen on which light is projected from the indicator in synchronization with the timing at which the indicator projects light;
A calculation unit that calculates a position on the screen on which light is projected from the indicator based on an image of the screen captured by the imaging unit;
The position detector according to claim 1, wherein the indicator projects light onto the screen at a specific timing based on the light emission timing signal input subsequent to the specific ID information from the output means. A position detection system comprising a plurality of the position detection devices according to claim 1,
Among the position detection devices constituting the position detection system, the ID information in the indicator of the first position detection device does not match the ID information in the indicator of the position detection device other than the first position detection device. A position detection system characterized by being set as follows. Video output means for outputting video;
A screen for displaying video output from the video output means;
An indicator that projects light onto the screen;
Storage means for storing unique ID information of the indicator;
Following the ID information recorded by the storage means, an output means for outputting a light emission timing signal indicating a specific timing at which the indicator projects light;
Imaging means for imaging the screen on which light is projected from the indicator in synchronization with the timing at which the indicator projects light;
A calculation unit that calculates a position on the screen on which light is projected from the indicator based on an image of the screen captured by the imaging unit;
The video display device, wherein the indicator projects light onto the screen at a specific timing based on the light emission timing signal input subsequent to the ID information from the output means. A video display system comprising a plurality of video display devices according to claim 3,
Among the video display devices constituting the video display system, the ID information in the indicator of the first video display device does not match the ID information in the pointer of the video display device other than the first video display device. A video display system characterized by setting as follows.

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