JP2012080376A - Video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video display device which is capable of showing a viewer with a constantly clear video when allowing the viewer to stereoscopically recognize the video.SOLUTION: In a video display device 1, a display control part 4 discriminates whether it is possible for the viewer to recognize the video stereoscopically, according to a user's wearing state, etc. of eyeglasses 10. Only when possible, the display control part 4 controls a display signal generation part 3 to generate a stereoscopic display signal indicating one or more videos for allowing the video of a basic video signal to be recognized stereoscopically. In residual cases, the display signal generation part 3 generates a flat display signal indicating videos for allowing the video of the basic video signal to be recognized flatly. A display element 5 displays on a flat display face 7 the videos indicated by the generated stereoscopic display signal or flat display signal. The viewer views the displayed video.

Description

  The present invention relates to a video display device that allows a viewer to perform three-dimensional video recognition using a display element having a flat display surface.

  In recent years, in a video display device including a display element having a flat display surface, as a so-called three-dimensional (hereinafter referred to as “3D”) video display, a technique for allowing a viewer to view a stereoscopic video in a pseudo manner has been proposed. As one of the three-dimensional image recognition techniques, there is a technique for giving a three-dimensional effect to a planar image using stereoscopic vision based on parallax.

  FIG. 11 is a schematic diagram for explaining the principle of the stereoscopic recognition technique using stereoscopic vision in the prior art. In the technique of FIG. 11, there are two display modes: a flat display mode that allows a viewer to recognize a video in a planar manner, and a stereoscopic display mode that allows a viewer to recognize a video in a stereoscopic manner. In the technique of FIG. 11, a display element that displays a planar image on a display surface and glasses that selectively block the left and right fields of view of the viewer are used.

  In the flat display mode which is a normal display, as shown in FIG. 11A, only one type of video 91 viewed from a single viewpoint with respect to an object is prepared. The display element displays only the video 91 from a single viewpoint, and the glasses 90 do not block the left and right visual fields of the viewer with both eyes 94. As a result, the viewer views the video 91 from a single viewpoint simultaneously with the left and right eyes 94, so that the displayed video 91 is recognized as being displayed in a planar shape.

  In the stereoscopic display mode, as shown in FIGS. 11 (B) and 11 (C), two types of images from viewpoints shifted from each other by the amount of parallax with respect to an object are displayed as a left-eye image 92 and a right-eye image 92. Prepared as an eye image 93. The display element alternately displays the left-eye image 92 and the right-eye image 93 at high speeds, and the glasses 90 display the right-eye side view and the left-eye side view in synchronization with the switching of the left and right images. Shut off alternately. As a result, since the viewer visually recognizes the right-eye video 93 with the right eye and visually recognizes the left-eye video 92 with the left eye, the viewer recognizes that the video is displayed three-dimensionally based on the illusion of parallax. .

  FIG. 12 is a diagram for explaining viewing procedures in the stereoscopic display mode and the flat display mode of the video display device in the related art. FIG. 12A is a diagram showing a viewing procedure in the stereoscopic display mode in the conventional video display device. When the basic video signal that is the video source is a video signal for stereoscopic recognition, the display mode of the video display device is switched to the stereoscopic display mode, and the viewer wears dedicated glasses. As a result, the video described with reference to FIGS. 11B and 11C is displayed, so that the viewer can perform three-dimensional recognition of the video.

  FIG. 12B is a diagram showing a viewing procedure in the flat display mode in the conventional video display device. When the basic video signal is not a video signal for stereoscopic recognition, the display mode of the video display device is switched to the flat display mode, and the viewer removes the dedicated glasses. As a result, the video described with reference to FIG. 11A is displayed, and the viewer recognizes the video as a plane.

  In such a stereoscopic recognition technology using stereoscopic vision, in a stereoscopic display mode, when a viewer who is not wearing dedicated glasses watches a video displayed on a display element, a video for left eye and a right video are displayed. Stereoscopic viewing is difficult because the eye image is mixed and viewed. Furthermore, when the left-eye video and the right-eye video are viewed together, it is difficult for a viewer who is not wearing glasses to clearly recognize the displayed video. For this reason, the conventional video display device using the stereoscopic recognition technology is configured to appropriately switch between the stereoscopic display mode and the flat display mode.

  The display modes shown in FIGS. 11 and 12 are switched by, for example, the viewer's own operation. Further, for example, the video display device switches the display mode depending on whether or not the basic video signal is for stereoscopic recognition. Furthermore, Patent Document 1 proposes a technique related to switching of display modes.

  In the stereoscopic television system of Patent Document 1, a television receiver for displaying video and dedicated glasses are prepared. The glasses are accompanied by switching signal generating means for generating a display mode switching signal and an infrared lamp that blinks based on the switching signal. The television receiver is accompanied by a means for receiving signals from an infrared lamp.

  In a state where the glasses are directed to the front of the television receiver, the receiving means on the television receiver side receives the signal from the infrared lamp. When the glasses are stored or the glasses are removed from the front of the television receiver, the receiving means on the television receiver side cannot receive the signal from the infrared lamp. The television receiver displays a 3D image as it is on the image receiving surface while the receiving means receives the signal from the infrared lamp, while the receiving means does not receive the signal from the infrared lamp. Then, the stereoscopic image is converted into a flat image and displayed on the image receiving surface.

JP-A-1-93987

  As described above, in the conventional video display device using the stereoscopic recognition technology using stereoscopic vision, the viewer needs to wear dedicated glasses in order to stereoscopically recognize the video. Therefore, in order to clearly view the video displayed in the stereoscopic display mode, the viewer needs to search for and wear glasses or manually switch the stereoscopic display mode to the flat display mode. Therefore, the conventional video display device takes time to view.

  The stereoscopic television system of Patent Document 1 described above automatically switches between the stereoscopic display mode and the flat display mode according to whether or not a switching signal is received from an infrared lamp attached to the glasses. However, since the 3D television system of Patent Document 1 does not clearly grasp that the viewer is wearing glasses, even if the glasses are simply placed in front of the television receiver, It will be switched to the display mode. As a result, it becomes difficult for the viewer to view clear video.

  Further, in the conventional image display device using the above-described stereoscopic recognition technology, the dedicated glasses include components such as a liquid crystal shutter that is driven to selectively block the left and right fields of view, and a power source for driving the components. ing. If the viewer is not wearing glasses and the stereoscopic display mode is selected, the components of the glasses are driven even when the viewer is not watching the video, which consumes unnecessary power. become.

  An object of the present invention is to provide a video display device that allows a viewer to always view a clear video when performing stereoscopic recognition of the video.

The present invention selects a stereoscopic display signal for stereoscopically recognizing the video of the video signal and a flat display signal for planarly recognizing the video of the video signal based on the video signal representing the video. Display signal generating means capable of generating automatically,
It is determined whether or not the image can be stereoscopically recognized, and the display signal generating unit generates the stereoscopic display signal only when the stereoscopic recognition is possible. When the stereoscopic recognition is not possible, the planar display signal is generated. Display control means,
A display signal of any one of the stereoscopic display signal generated by the display signal generation means and the flat display signal generated by the display signal generation means is given, and an image based on the given display signal is displayed flat. A display device including a display element for displaying on a surface.

The present invention also provides glasses for allowing a viewer to stereoscopically recognize a video displayed on the display element based on the stereoscopic display signal;
A wearing state discriminating means for discriminating a wearing state of the glasses to a viewer;
The display control unit is configured to generate the stereoscopic display signal when the glasses are worn based on a determination result of the wearing state determination unit.

The present invention further includes a wearing sensor that is attached to the glasses, and that emits different signals when the glasses are worn by a viewer and when the glasses are not worn.
The wearing state discriminating unit discriminates the wearing state of the glasses in response to a signal output from the wearing sensor.

In addition, the present invention further includes a photographing unit that is attached to the display element and photographs a viewable area facing the display surface of the display element,
The wearing state discriminating unit discriminates the wearing state of the glasses by analyzing the video of the viewable area taken by the photographing unit and discriminating whether or not there are viewers wearing the glasses in the viewable area. It is characterized by doing.

  Further, according to the present invention, the wearing state determining unit repeatedly determines the wearing state of the glasses every predetermined time period, and when it is determined that the glasses are not worn continuously for a predetermined number of times, the glasses are not worn. The display control means is provided with a determination result indicating that it is attached.

In addition, the present invention is provided with the glasses, a glasses power supply for supplying power used to drive the glasses for stereoscopic recognition of the video,
In response to the wearing state discriminating means, the apparatus further comprises power control means for stopping power supply from the eyeglass power supply when the glasses are not worn.

  Further, according to the present invention, the display control unit determines whether or not the stereoscopic recognition of the video is possible every predetermined time period, and whenever the determination result is obtained, the stereoscopic display is performed based on the determination result. A signal or the flat display signal is generated.

In the present invention, the video signal alternately indicates a stereoscopic recognition image or a planar recognition image as time passes,
The display signal generating means, when the display control means determines that the video can be stereoscopically recognized, if the video signal indicates a stereoscopic recognition video, the stereoscopic signal indicating the stereoscopic recognition video. If a display signal is generated and the video signal indicates a video for plane recognition, the plane recognition video is converted into a video for stereoscopic recognition, and the stereoscopic display signal indicating the converted video is generated. It is characterized by that.

  According to the present invention, a video display device displays a video based on a video signal on a flat display surface of a display element in a manner capable of stereoscopic recognition, and allows the viewer to stereoscopically recognize the video. In addition to the display element, the video display device includes display signal generation means for generating a display signal to be given to the display element, and display control means for controlling the generation of the display signal. The display control means determines whether or not the viewer is in a state capable of stereoscopic recognition of the video, and causes the display signal generation means to generate one of the stereoscopic display signal and the flat display signal according to the determination result. That is, a stereoscopic display signal for displaying one or more images for stereoscopically recognizing the video is generated only when the viewer can recognize the stereoscopic image, and when the stereoscopic recognition is not possible, the video is planarly recognized. A plane display signal for displaying an image for the purpose is generated.

  As a result, the video display device of the present invention uses a stereoscopic display mode for allowing the viewer to stereoscopically recognize the video and a flat display mode for causing the viewer to recognize the video as a plane, depending on the ability of the viewer to recognize the stereoscopic image. It can be switched automatically according to the response. Therefore, the video display device of the present invention can always provide clear video to the viewer. In addition, this makes it possible for the video display device of the present invention to reduce the trouble of switching the display mode of the viewer, thereby improving usability.

  According to the invention, the video display device further includes glasses to be worn by the viewer and wearing state determining means for determining the wearing state of the glasses. The glasses are used to cause the viewer to stereoscopically recognize the video displayed on the display surface of the display element based on the stereoscopic display signal in the stereoscopic display mode. The display control means determines whether or not the viewer can recognize the stereoscopic image based on the determination result of the wearing state of the glasses. When the glasses are worn by the viewer, it is determined that the viewer can perform stereoscopic recognition of the video, and the stereoscopic display signal is generated. When the glasses are not worn, it is determined that stereoscopic recognition of the video by the viewer is impossible, and the flat display signal is generated.

  Thus, the video display device of the present invention can automatically switch the video display mode according to the wearing state of the glasses in a situation where it is necessary to request the viewer to wear the glasses in the stereoscopic display mode. . Therefore, the video display device of the present invention can always provide a clear video to the viewer regardless of whether or not glasses are worn. This also makes it possible for the video display device of the present invention to specifically reduce the trouble of switching the display mode of the viewer, thus improving usability.

  According to the present invention, the video display device of the present invention further includes a mounting sensor that is attached to the glasses and that emits a signal corresponding to the wearing state of the glasses to the viewer. In the video display device of the present invention, the wearing state of the viewer's glasses is determined in response to a signal output from the wearing sensor.

  As a result, the video display device of the present invention can directly detect the wearing state of the viewer's glasses, and thus can reliably determine the wearing state. Therefore, the video display device of the present invention can reliably switch the display mode according to the wearing state of the glasses without any error. Therefore, the video display device of the present invention can further improve the usability.

  According to the present invention, the video display device of the present invention further includes a photographing unit that is attached to the display element and photographs a viewable area facing the display surface of the display element. In the video display device of the present invention, the video of the viewable area captured by the imaging unit is analyzed. Based on the result of the analysis, the wearing state of the glasses is determined according to the presence or absence of a viewer wearing the glasses in the viewable area.

  As a result, the video display device of the present invention can switch the display mode by reliably determining the wearing state of the viewer's glasses by using the configuration associated with the display element rather than the glasses side. Therefore, since the configuration of the glasses is prevented from becoming more complicated than before, the video display device of the present invention can prevent an increase in the load on the viewer. This also allows the video display device of the present invention to determine not only the viewer's eyeglass wearing state but also the presence / absence of the viewer in the viewable area. Therefore, when only the glasses are present in the viewable area and the viewer is absent, switching to the stereoscopic display mode is not performed. Therefore, the video display device of the present invention can further improve usability.

  According to the present invention, the video display device of the present invention repeatedly determines the wearing state of the glasses every predetermined time period. When the determination result that the glasses are not worn is continuously obtained a predetermined number of times, the determination result that the glasses are not worn is given to the display control means. As a result, the flat display signal is generated only when the determination result that the glasses are not worn continues for a plurality of times.

  Thereby, the video display device of the present invention switches the display mode from the stereoscopic display mode to the flat display mode when it is determined that the glasses are not worn over a plurality of continuous determinations. Therefore, the video display apparatus according to the present invention can prevent misidentification of the glasses that are not worn, further improving usability.

  According to the present invention, the video display device of the present invention further includes a power supply for glasses that accompanies the glasses, and a power control means for the power supply for the glasses. The power supply for glasses is a power supply for supplying electric power used for driving glasses for stereoscopic recognition of the video. In the video display device of the present invention, when it is determined that the glasses are not worn, the power control means stops the power supply from the glasses power source. As a result, the video display device of the present invention can suppress unnecessary power consumption of the power supply for the glasses, and thus can improve the power consumption of the power supply for the glasses.

  Further, according to the present invention, in the video display device of the present invention, the determination of the ability of stereoscopic recognition of video and the generation of a display signal based on the determination result are repeated at predetermined time periods. As a result, a 3D display signal or a 2D display signal is appropriately generated according to the capability of 3D recognition for each predetermined time period.

  That is, the video display device according to the present invention automatically switches the display mode appropriately according to the change in the ability of the three-dimensional recognition over time in a situation where the three-dimensional display mode and the two-dimensional display mode can be switched. For example, when the stereoscopic recognition becomes possible in the planar display mode, the mode is switched to the stereoscopic display mode, and when the stereoscopic recognition becomes impossible in the stereoscopic display mode, the mode is switched to the planar display mode. As a result, the video display device of the present invention switches the display mode as appropriate according to the temporal change in the recognition state of the viewer's video under the above circumstances, so that the usability can be further improved.

  According to the present invention, in the video display device of the present invention, the video signal alternately indicates a stereoscopic recognition video and a planar recognition video over time. When it is determined that the viewer can perform stereoscopic recognition, the video display device of the present invention generates a stereoscopic display signal as it is if the video signal indicates a video for stereoscopic recognition. If the video signal indicates a video for plane recognition, the video display device converts the video for plane recognition into a video for stereoscopic recognition, and generates a stereoscopic display signal indicating the converted video.

  Thus, the video display device according to the present invention can display not only the period in which the video signal indicates the video for stereoscopic recognition but also the video signal indicates the video for plane recognition if the viewer can perform the stereoscopic recognition. Also during the period, video display in the stereoscopic display mode is performed. As a result, the video display device of the present invention can increase the display period in the stereoscopic display mode as compared with the prior art, so that the usability is further improved.

It is a block diagram which shows the structure of the video display apparatus 1 which is one Embodiment of this invention. 2 is a block diagram showing a specific functional configuration of a part of the glasses 10. FIG. 3 is a diagram for explaining a first configuration of a wearing sensor 13 included in the glasses 10. FIG. FIG. 6 is a diagram for explaining a second configuration of the wearing sensor 13 included in the glasses 10. It is a figure for demonstrating the behavior of the display element 5 and the glasses 10 at the time of a stereoscopic display mode. 4 is a timing chart for explaining display mode switching in the video display device 1. 4 is a flowchart for explaining a first example of a basic operation on the receiver 20 side. It is a flowchart for demonstrating the basic operation | movement by the side of the glasses 10 responding to the basic operation | movement by the side of the receiver 20. 6 is a flowchart for explaining a second example of the basic operation on the receiver 20 side. 12 is a flowchart for explaining a third example of the basic operation on the receiver 20 side. It is a schematic diagram for demonstrating the principle of the stereoscopic recognition technique using the stereoscopic vision in a prior art. It is a figure for demonstrating the viewing-and-listening procedure of the stereoscopic display mode of the video display apparatus in a prior art, and planar display mode.

  FIG. 1 is a block diagram showing a configuration of a video display device 1 according to an embodiment of the present invention. The video display device 1 shown in FIG. 1 has a configuration capable of displaying a video that can be three-dimensionally recognized by a viewer on a flat display surface 7 for so-called three-dimensional video display. In this specification, a video includes both a still image and a moving image. Also, for example, videos. Specifically, it is realized by sequentially displaying a plurality of frames that are still images as time elapses.

  The video display device 1 in FIG. 1 not only allows the viewer to recognize the video three-dimensionally, but also allows the viewer to recognize the video planarly. For this purpose, the video display device 1 has two display modes, a stereoscopic display mode and a flat display mode. When the stereoscopic display mode is selected, a display for allowing the viewer to stereoscopically recognize the video is performed. When the plane display mode is selected, a display for allowing the viewer to recognize the image as a plane is performed.

  The video display device 1 of FIG. 1 includes at least a display signal generation unit 3, a display control unit 4, and a display element 5 having a flat display surface 7. The video display device 1 preferably includes at least one of the glasses 10 to be worn by the viewer, the wearing state determination unit 11, the wearing sensor 13, the photographing unit 14, the glasses power supply 16, and the power supply control unit 17. Including.

  The wearing sensor 13, the power supply 16 for glasses, and the power control unit 17 are attached to the glasses 10. The imaging unit 14 is attached to the display element 5. The wearing state determination unit 11 is attached to at least one of the glasses 10 and the display element 5. In the example of FIG. 1, the wearing state determination unit 11 is attached to both the glasses 10 and the display element 5. In the example of FIG. 1, the video display device 1 is configured to include a receiver 20 in addition to the glasses 10. The display element 5, the display signal generation unit 3, the display control unit 4, and the imaging unit 14 are accommodated in the housing of the receiver 20.

  In the video display device 1 of FIG. 1, the display signal generation unit 3 generates a stereoscopic display signal and a flat display signal for displaying the video on the flat display surface 7 of the display element 5 based on the basic video signal representing the video. , Configured to be selectively generated. The stereoscopic display signal is a signal for causing the display element to display one or more videos for allowing the viewer to stereoscopically recognize the video of the basic video signal. The flat display signal is a signal for causing the display element to display a video for allowing the viewer to recognize the video of the basic video signal in a planar manner. The basic video signal is a video signal.

  The display control unit 4 determines whether or not the viewer can perform stereoscopic recognition of the video, and displays either one of the stereoscopic display signal and the flat display signal according to the determination result as a display signal generation unit. 3 to generate. That is, the display control unit 4 causes the display signal generation unit 3 to generate a stereoscopic display signal only when stereoscopic recognition is possible, and generates a planar display signal in the remaining case, that is, when stereoscopic recognition is not possible. The generated stereoscopic display signal or flat display signal is given from the display signal generator 3 to the display element 5. The display element 5 displays an image based on the given stereoscopic display signal or flat display signal on the flat display surface 7.

  Accordingly, the video display device 1 of FIG. 1 can automatically switch between the three-dimensional recognition of the video and the two-dimensional video recognition according to the viewer's three-dimensional recognition capability status. In other words, the video display device 1 can automatically switch between a stereoscopic display mode using a stereoscopic display signal and a flat display mode using a flat display signal according to the viewer's ability to recognize three-dimensional recognition. Thus, since the display mode is automatically switched according to the viewing situation of the viewer, the video display device 1 can make the viewer always clearly recognize the video. Therefore, the video display apparatus 1 of FIG. 1 can improve usability.

  In FIG. 1, glasses 10 are used for allowing a viewer to stereoscopically recognize an image displayed on the display element 5 based on a stereoscopic display signal. The wearing state determination unit 11 determines the wearing state of the glasses 10 to the viewer. When the video display device 1 includes the glasses 10, the display control unit 4 determines the ability of the viewer to recognize three-dimensional recognition based on the wearing state of the glasses 10 to the viewer.

  That is, when it is determined that the glasses 10 are worn by the viewer, the display control unit 4 determines that the viewer can stereoscopically recognize the video, and generates a stereoscopic display signal in the display signal generation unit 3. Let When it is determined that the glasses 10 are not worn, the display control unit 4 determines that stereoscopic recognition of the video by the viewer is impossible, and causes the display signal generation unit 3 to generate a flat display signal. As a result, when it is determined that the glasses 10 are attached, a stereoscopic recognition image based on the stereoscopic display signal is displayed on the display element 5, and when it is determined that the glasses are not attached, the flat display signal is displayed. An image for plane recognition based on this is displayed on the display element 5.

  Thereby, the video display device 1 automatically switches the display mode according to the wearing state of the viewer's glasses 10 in a situation where it is necessary to request the viewer to wear the glasses 10 in the stereoscopic display mode. Can do. Specifically, when the glasses are already worn, the viewer can clearly recognize the image three-dimensionally, so that the image display in the three-dimensional display mode is executed. When the glasses are not worn, it is difficult for the viewer to clearly recognize the image in the stereoscopic display mode, and thus the image display in the flat display mode is performed in which the image can be clearly recognized even with the naked eye. Therefore, the video display device 1 can make the viewer always clearly recognize the video regardless of whether or not the viewer wears the glasses 10.

  The video display device 1 switches the display mode based on the result of automatic determination of the wearing state of the viewer's glasses 10. In other words, the display mode of the video display device can be switched in response to the attachment / detachment by simply removing the glasses. As a result, the video display device 1 can specifically reduce the trouble of switching the display mode of the viewer, compared to the conventional technique that requires the viewer to perform an operation other than the eyeglass attachment / detachment. Therefore, the video display device 1 of FIG. 1 can further improve usability.

  In the video display device 1 of FIG. 1, the wearing sensor 13 is provided along with the glasses 10, and emits different signals when the glasses 10 are worn by the viewer and when they are not worn. The wearing state determination unit 11 determines the wearing state of the glasses 10 in response to a signal output from the mounting sensor 13. Based on the determination result of the mounting state in response to the output of the mounting sensor 13, switching of the display mode of the video display device 1 as described above is executed.

  Accordingly, the video display device 1 of FIG. 1 can directly detect the wearing state of the glasses 10 of the viewer by the wearing sensor 13 attached to the glasses 10, so that the wearing state of the glasses 10 can be reliably determined. it can. Therefore, the video display device 1 can reliably switch the display mode according to the wearing state of the glasses 10 without error. Therefore, the video display device 1 can further improve usability.

  In the video display device 1 of FIG. 1, the photographing unit 14 is provided along with the display element 5 and photographs a predetermined viewable area 8. The viewable area 8 is, for example, an area in a predetermined range facing the display surface 7 of the display element 5. The viewable area 8 is set so that a viewer who is present in the viewable area 8 and faces the display surface 7 can view the image being displayed on the display surface 7. The wearing state determination unit 11 analyzes the video of the viewable area 8 photographed by the photographing unit 14 and determines the presence / absence of a viewer wearing the glasses 10 in the viewable area 8, thereby determining the wearing state of the glasses 10. Determine. Based on the determination result of the mounting state in response to the imaging result of the imaging unit 14, the switching of the display mode of the video display device 1 as described above is executed.

  Accordingly, the video display device 1 of FIG. 1 can switch the display mode by reliably determining the wearing state of the viewer's glasses 10 using the configuration associated with the display element 5 instead of the glasses 10. Therefore, since the configuration for determining the capability of stereoscopic image recognition is attached to the display element 5 instead of the glasses 10, it is possible to prevent the configuration of the glasses 10 from becoming more complicated than before. Therefore, the video display device 1 of FIG. 1 can prevent an increase in viewer load caused by an increase in the weight of the glasses 10 or the like.

  When the display mode is switched in response to the photographing result of the photographing unit 14, the video display device 1 in FIG. 1 not only shows the viewer wearing the glasses 10 but also the presence of the viewer in the viewable area 8. It is possible to determine the presence or absence. Therefore, when only the glasses 10 exist in the viewable area 8 and the viewer is absent, the transition to the stereoscopic display mode is not performed. Therefore, the video display device 1 can further improve usability.

  In the video display device 1 of FIG. 1, the wearing state determination unit 11 repeatedly determines the wearing state of the glasses 10 at predetermined time intervals. When it is determined that the glasses 10 have not been worn for a predetermined number of times, the wearing state determination unit 11 provides the display control unit 4 with a determination result indicating that the glasses 10 have not been worn. As a result, a plane display signal is generated and an image for plane recognition is displayed on the display surface 7 only when the determination result in which the glasses 10 are not worn continues for a plurality of times.

  Accordingly, in the video display device 1 of FIG. 1, when it is determined that the glasses 10 are not worn over a plurality of consecutive determinations, the display mode is switched from the stereoscopic display mode to the flat display mode. Therefore, the video display device 1 can prevent misidentification of the glasses 10 not being worn, further improving usability. Misidentification of the unmounted state may be, for example, a temporary signal blur of the mounted sensor 13 or a temporary shooting failure of the shooting unit 14.

  Furthermore, in FIG. 1, the glasses 10 preferably have components for allowing a viewer to stereoscopically recognize a stereoscopic recognition video. A component related to the three-dimensional recognition of the glasses 10 may be a static configuration or a dynamic configuration. When the component related to the three-dimensional recognition of the glasses 10 has a dynamic configuration, the component may require electric power for driving. In this case, a power supply 16 for glasses is provided along with the glasses 10.

  The power supply 16 for glasses supplies power to components related to stereoscopic recognition of images in the glasses 10. In response to the determination result of the wearing state determination unit 11, the power supply control unit 17 stops the power supply from the power supply 16 for glasses when it is determined that the glasses 10 are not worn. That is, in the video display device 1, when the glasses 10 are not worn, that is, in a situation where the video display device 1 operates in the flat display mode, power supply to the configuration related to the stereoscopic recognition of the video in the glasses 10 is stopped. Is done.

  In the flat display mode, it is not necessary to drive the components related to the stereoscopic recognition of the video. Therefore, if the power supply to the driving components related to the stereoscopic recognition of the video is stopped in the flat display mode, the power consumption of the glasses power supply 16 is consumed. Can be suppressed. Therefore, the video display device 1 in FIG. 1 controls the power supply from the glasses power supply 16 in response to the determination result of the wearing state determination unit 11, thereby improving the power consumption of the glasses power supply 16 and saving power. Can be

  In FIG. 1, the display control unit 4 determines whether or not a three-dimensional image can be recognized every predetermined time period. The display control unit 4 causes the display signal generation unit 3 to generate a stereoscopic display signal or a flat display signal based on the determination result every time a determination result of capability of stereoscopic recognition of video is obtained. As a result, in the video display device 1 of FIG. 1, the determination of the capability of stereoscopic recognition of video and the generation of a display signal based on the determination result are repeated at predetermined time periods.

  That is, in a situation where the stereoscopic display mode and the flat display mode can be switched, the video display device 1 of FIG. 1 automatically switches the display mode appropriately according to the change in the capability of stereoscopic recognition with the passage of time. For example, when the stereoscopic recognition becomes possible in the planar display mode, the mode is switched to the stereoscopic display mode, and when the stereoscopic recognition becomes impossible in the stereoscopic display mode, the mode is switched to the planar display mode. Accordingly, the video display device 1 of FIG. 1 can switch the display mode as appropriate according to the temporal change in the recognition state of the viewer's video under the above-described circumstances, so that the usability can be further improved.

  In FIG. 1, the basic video signal alternately indicates a stereoscopic recognition video or a planar recognition video as time passes. When the display control unit 4 determines that the viewer can perform stereoscopic recognition of the video under such circumstances, the display signal generation unit 3 determines that the stereoscopic video if the basic video signal indicates the stereoscopic recognition video. A stereoscopic display signal indicating a recognition image is generated. In addition, when the viewer can perform stereoscopic recognition of the video under the above situation, if the basic video signal indicates a plane recognition video, the display signal generation unit 3 converts the plane recognition video into a stereoscopic recognition video. The stereoscopic display signal indicating the converted video is generated.

  In other words, the video display device 1 is a planar 3D that converts a video for plane recognition into a video for stereoscopic recognition if the viewer can stereoscopically recognize the video and the basic video signal indicates a video for plane recognition. Conversion processing, so-called 2D-3D conversion processing is performed. As a specific example of the plane / three-dimensional conversion process, for example, a plane recognition video is analyzed in units of a plurality of consecutive frames in the video, and two types of videos with different viewpoints are based on the analysis result. And a video signal indicating video from the two types of viewpoints is generated. The plane / three-dimensional conversion process is not limited to the above-described specific example, and may be other processes as long as the three-dimensional recognition video can be generated from the plane recognition video.

  As a result, the video display device 1 in FIG. 1 switches to the 3D display mode even if the basic video signal indicates a video for plane recognition, under the situation where the viewer can perform 3D recognition. The video is converted into a video for stereoscopic recognition, and the stereoscopic recognition of the video is performed. As a result, the video display device 1 can display not only the period in which the basic video signal indicates the video for stereoscopic recognition but also the basic video signal indicates the video for plane recognition if the viewer can perform the stereoscopic recognition. Also during the period, video display in the stereoscopic display mode is performed. As a result, the video display device 1 can increase the display period in the stereoscopic display mode as compared with the conventional case, so that the usability is further improved.

  In the video display device 1 of FIG. 1, for example, in the flat display mode, when the basic video signal indicates an image for plane recognition, the display signal generation unit 3 generates a plane display signal that directly indicates the image for plane recognition. Let In the planar display mode, when the basic video signal indicates a stereoscopic recognition video, the display signal generation unit 3 converts the stereoscopic recognition video into a planar recognition video and displays the converted video. Generate a signal.

  That is, if the video display device 1 cannot stereoscopically recognize the viewer's video, the video display device 1 recognizes the stereoscopic recognition video if the basic video signal indicates a plane recognition video. 3D-to-D conversion processing, that is, so-called 3D-2D conversion processing is performed. As a specific example of the stereoscopic plane conversion process, for example, only the video from one of the two viewpoints included in the stereoscopic recognition video is extracted, and only from the extracted video A video signal is generated. The three-dimensional plane conversion process is not limited to the specific example described above as long as a plane recognition video can be generated from a three-dimensional recognition video.

  As a result, the video display device 1 performs video display in the flat display mode regardless of the video type of the basic video signal in a situation where stereoscopic recognition of the video is difficult, such as when the glasses 10 are not attached. As a result, the video display device 1 allows the viewer to always recognize the video plane in a situation in which it is difficult to perform three-dimensional recognition of the video, so that the viewer can always clearly recognize the video in that situation, and the usability is further improved. improves.

  In the video display device 1 of FIG. 1, the stereoscopic recognition video indicated by the basic video signal is specifically a video from two viewpoints shifted from each other by the amount of parallax with respect to the object, so-called left eye. Video and right-eye video. Specifically, the video display apparatus 1 in FIG. 1 uses a so-called frame sequential video stereoscopic recognition technique as a stereoscopic recognition technique for video.

  In the frame-sequential video stereoscopic recognition technology, the display element 5 switches the left-eye video and the right-eye video alternately and periodically and at high speed. In addition, the glasses 10 alternately block the right eye side view and the left eye side view in synchronization with the switching of the left eye image and the right eye image. As a result, since the viewer visually recognizes the video for the right eye with the right eye and visually recognizes the video for the left eye with the left eye, the viewer recognizes that the video is displayed three-dimensionally by the illusion of parallax.

  The basic video signal described above includes video signals indicating videos from two types of viewpoints for stereoscopic recognition. Further, the basic video signal may be configured such that a video signal for stereoscopic recognition and a video signal indicating a video from one type of viewpoint for plane recognition are alternately included with time. The stereoscopic display signal generated based on the stereoscopic recognition video signal causes the display surface 7 to alternately display images from two types of viewpoints indicated by the stereoscopic recognition video signal for a predetermined period. The plane display signal generated based on the video signal for plane recognition causes the display surface 7 to display an image from one type of viewpoint indicated by the plane recognition video signal. For example, the basic video signal is realized by a broadcast signal based on the standard of television broadcasting, and the stereoscopic display signal and the flat display signal are realized by internal signals based on the standards of the video display device 1 and the display element 5.

  Specifically, the frame-sequential video display device 1 of FIG. 1 has a configuration including a receiver 20 including a display element 5 and glasses 10 worn by a viewer. Specifically, in addition to the display signal generation unit 3, the display control unit 4, and the display element 5, the receiver 20 includes a transmission unit 21, a reception unit 22, a controller 23, a video input terminal 24, a stereoscopic video determination unit 25, And a synchronization signal generator 26. The display signal generation unit 3 functionally includes a stereoscopic display signal generation unit 27, a planar display signal generation unit 28, and a stereoscopic plane display selection unit 29. The glasses 10 include a visual field control mechanism 30 for selectively controlling blocking and transmission of the viewer's left eye side field and right eye side field of view as a component related to the stereoscopic recognition of video. In addition to the visual field control mechanism 30, specifically, the glasses 10 further include a transmission unit 31, a reception unit 32, a controller 33, and a power switch 37. The visual field control mechanism 30 includes at least a left eye shutter 35 and a right eye shutter 36.

  Various signals related to video display based on basic video signals between the transmission unit 21 of the receiver 20 and the reception unit 32 of the glasses 10 and between the transmission unit 31 of the glasses 10 and the reception unit 22 of the receiver 20 Are sent and received respectively. Signal transmission / reception between the receiver 20 and the glasses 10 is wireless communication, and may be realized by infrared communication or radio wave communication, for example.

  The controller 23 of the receiver 20 is an arithmetic circuit for controlling the components inside the receiver 20. In the example of FIG. 1, the display control unit 4 and the mounting state determination unit 11 on the receiver 20 side are functional components realized by the calculation function of the controller 23. Not only the display control unit 4 and the mounting state determination unit 11 but also other components of the receiver 20, for example, at least one of the display signal generation unit 3, the stereoscopic video determination unit 25, and the synchronization signal generation unit 26 is a controller. It may be functionally realized by 23 arithmetic functions.

  The video input terminal 24 is a terminal for inputting a basic video signal to the receiver 20 from the outside. For example, when the basic video signal is a broadcast signal of a television broadcast, the video input terminal 24 is realized by an input terminal corresponding to the television broadcast signal standard. The stereoscopic video discriminating unit 25 discriminates whether a basic video signal input from the video input terminal 24 indicates a stereoscopic recognition image or a planar recognition image.

  The synchronization signal generation unit 26 generates a synchronization signal to be given from the receiver 20 to the glasses 10 in the stereoscopic display mode. In the stereoscopic display mode, the synchronization signal synchronizes the display timing of the left-eye video and the right-eye video on the display element 5 with the cutoff timing of the left-eye shutter 35 and the right-eye shutter 36 of the glasses 10. Timing signal. The synchronization signal is transmitted from the transmission unit 21 of the receiver 20 and received by the reception unit 32 of the glasses 10.

  The stereoscopic display signal generation unit 27 generates a stereoscopic display signal based on the basic video signal. The flat display signal generation unit 28 generates a flat display signal based on the basic video signal. In response to the control of the controller 23 of the receiver 20, the stereoscopic plane display selection unit 29 selectively generates and outputs one of the stereoscopic display signal and the planar display signal in the display signal generation unit 3. Let

  The stereoscopic plane display selection unit 29 is provided in at least one of the front and rear stages of the stereoscopic display signal generation unit 27 and the plane display signal generation unit 28. If the stereoscopic plane display selection unit 29 is provided in front of both the signal generation units 27 and 28, only one of the selected display signals is selectively generated and output to either one of the signal generation units. In addition, if the three-dimensional plane display selection unit 29 is provided at the subsequent stage of both the signal generation units 27 and 28, one of the two display signals generated in parallel by the both signal generation units 27 and 28 is selected. Only the display signal is selectively output.

  In the video display device 1 of FIG. 1, among the components of the glasses 10, components that require power when driven are supplied with power from the glasses power supply 16. The components that need to be supplied with power are, for example, components related to stereoscopic image recognition, and in the example of FIG. 1, the left-eye shutter 35, the right-eye shutter 36, and the shutter drive circuit 34. Specifically, the eyeglass power source 16 is realized by a small battery that can be incorporated in the eyeglasses 10, for example, a lithium battery or an alkaline manganese dry battery.

  In the video display device 1 of FIG. 1, it is preferable that the power supply to the components related to the stereoscopic recognition of video is lifted when switching from the flat display mode to the stereoscopic display mode, and when switching from the stereoscopic display mode to the flat display mode. The power supply to the components related to the stereoscopic recognition of the video is stopped or reduced to the minimum level. Specifically, the glasses 10 receive a signal from the receiver 20 related to the display mode switching, and in response to the signal, the power supply to the components related to the stereoscopic recognition of the video is suspended. As a result, during standby when the flat display mode is selected, power consumption is suppressed to the minimum level, so that power consumption of the eyeglass power supply 16 is suppressed. The component related to the stereoscopic recognition of the video is, for example, the visual field control mechanism 30 including the left eye shutter 35 and the right eye shutter 36 at a minimum.

  In order to further reduce the power consumption of the power supply 16 for glasses, specifically, the left-eye shutter 35 and the right-eye shutter 36 have a left-eye view and a right-eye view when power is not supplied. It is preferable that it is the structure to permeate. As a result, power supply to the left eye shutter 35 and the right eye shutter 36 can be stopped during the standby flat display mode, so that power consumption can be suppressed. Also, with the above-described configuration, the visual field is not blocked even when the glasses 10 are worn during the flat display mode, so that the video can be viewed without any problem, and the power consumption can be suppressed. it can.

  The left-eye shutter 35 and the right-eye shutter 36 are driven by the shutter drive circuit 34 and selectively block the viewer's left-eye view and right-eye view, respectively. Specifically, the left eye shutter 35 and the right eye shutter 36 are fitted in the rim of the frame 50 of the glasses 10 instead of the lens. Under the situation where the left eye shutter 35 and the right eye shutter 36 do not block the left eye side view and the right eye side view, respectively, the left eye side view and the right eye side view are the left eye shutter 35 and the right eye side view. Since the light passes through the shutter 36, the left eye and the right eye can see the display surface 7 of the display element 5.

  The controller 33 of the glasses 10 is an arithmetic circuit for controlling components associated with the glasses 10. In the example of FIG. 1, the power control unit 17 is a functional component realized by the calculation function of the controller 33. Not only the power supply control unit 17 but other components of the glasses 10, for example, the wearing state determination unit 11 may be functionally realized by the calculation function of the controller 33. The power switch 37 is operated by the viewer when the viewer instructs the start and stop of the stereoscopic display of the video.

  FIG. 2 is a block diagram showing a specific functional configuration of a part of the glasses 10. In the glasses 10, the controller 33 functionally realizes the decoding unit 41 and the timing signal generation unit 42. Specifically, the shutter drive circuit 34 includes a switch circuit 44, a left-eye shutter drive circuit 45, and a right-eye shutter drive circuit 46.

  When the synchronization signal from the receiver 20 is received by the receiving unit 32 of the glasses 10, the decoding unit 41 decodes the synchronization signal. The timing signal generation unit 42 generates a timing signal indicating the timing for switching the states of the left-eye shutter 35 and the right-eye shutter 36 based on the decoding result of the decoding unit 41. The switch circuit 44 controls the left-eye shutter drive circuit 45 and the right-eye shutter drive circuit 46 based on the timing signal from the timing signal generator 42. The left-eye shutter drive circuit 45 and the right-eye shutter drive circuit 46 drive the left-eye shutter 35 and the right-eye shutter 36 to selectively block the left-eye view and the right-eye view. The drive timing of the left eye shutter 35 and the right eye shutter 36, that is, the cutoff timing of the left eye field and the right eye field, is controlled by the switch circuit 44.

  In the frame sequential type video display device 1, it is necessary to switch the occlusion state and the transmission state of each eye view at high speed. Therefore, the left-eye shutter 35 and the right-eye shutter 36 are preferably realized by liquid crystal shutters capable of high-speed reaction. In the example of FIG. 1, a liquid crystal shutter is used to block the left and right fields of view. As a method for showing different images to the left eye and the right eye, a method using a polarizing plate whose angle is changed to the left or right or a colored plate whose left and right colors are changed may be used.

  FIG. 3 is a diagram for explaining a first configuration of the wearing sensor 13 included in the glasses 10. As shown in FIG. 3A, the mounting sensor 13 is specifically realized by at least one of a deployment sensor 51, a proximity sensor 52, and an objective sensor 53. The deployment sensor 51 is realized by, for example, a switch component. The proximity sensor 52 and the objective sensor 53 are realized by optical sensors, for example.

  The deployment sensor 51 is provided on at least one of the left and right hinges of the frame 50 of the glasses 10. The unfolding sensor 51 detects whether the temple (also referred to as “vine”) of the frame 50 of the glasses 10 is unfolded or folded. In order for the viewer to wear the glasses 10, it is necessary to unfold the left and right temples of the frame frame 50. Therefore, whether or not the temples are unfolded corresponds to the wearing state of the glasses 10 of the viewer. The unfolding sensor 51 outputs a signal indicating presence / absence of temple expansion as a signal indicating presence / absence of wearing of the viewer's glasses 10.

  The proximity sensor 52 is provided at a position facing the viewer when worn on the bridge of the frame 50 of the glasses 10 and in the vicinity of the bridge. As shown in FIG. 3B, the proximity sensor 52 detects the distance between the glasses 10 and an object at a position facing the frame 50. While the viewer wears the glasses 10, the viewer stays close until the distance between the frame 50 and the viewer's face is less than a predetermined distance. The proximity sensor 52 detects the distance between the frame 50 and the object itself, or detects whether the distance between the frame 50 and the viewer's face is less than a predetermined distance, and responds to the detection result. The signal is output as a signal indicating whether or not the viewer wears the glasses 10.

  The objective sensor 53 includes a pair of transmitting element 54 and receiving element 55. The transmitting element 54 and the receiving element 55 are provided on the left and right temples of the frame 50 of the glasses 10 at positions facing each other when the temples are unfolded. As shown in FIG. 3C, a signal 59 such as light or electromagnetic wave is transmitted and received between the transmitting element 54 and the receiving element 55. As shown in FIG. 3D, when a viewer's head or the like is interposed between the transmitting element 54 and the receiving element 55, the signal 59 from the transmitting element 54 is blocked and does not reach the receiving element 55. The objective sensor 53 detects whether or not the signal 59 from the transmitting element 54 is received by the receiving element 55, that is, whether or not an object exists between the transmitting element 54 and the receiving element 55, and the detection result Is output as a signal indicating whether or not the viewer wears the glasses 10.

  The wearing state determination unit 11 determines whether or not the glasses 10 are worn by the viewer, that is, whether or not the three-dimensional image can be recognized, in response to the signals from the three types of mounting sensors 13 described above. The determination result of the wearing state of the glasses 10 is given to the display control unit 4 as a viewing permission / inhibition signal indicating whether or not stereoscopic recognition of the video is possible.

  FIG. 4 is a diagram for explaining a second configuration of the wearing sensor 13 included in the glasses 10. In the example of FIG. 4, a curved reflector 56 is provided as the mounting sensor 13. The reflection plate 56 is provided at a position facing the receiver 20 when mounted on the bridge of the frame 50 of the glasses 10 and in the vicinity of the bridge. The receiver 20 further includes a transmission unit 57 and a reception unit 58 for detecting attachment. The transmitting / receiving unit 21 and the receiving unit 22 for signal transmission / reception may also serve as the transmitting unit 57 and the receiving unit 58 for mounting detection.

  The wearing detection transmitting unit 57 always transmits a signal that can be reflected by the reflecting plate 56 in the viewable area 8. The reflection plate 56 reflects the signal from the mounting detection transmission unit 57 of the receiver 20. Only when the viewer wears the glasses 10 and faces the receiver 20 in the viewable area 8 of the display element 5, the signal reflected from the reflection plate 56 is received by the wearing detection receiving unit 58. Only when the reflected signal is received by the wearing detection receiving unit 58, it is determined that the viewer wears the glasses 10 and exists in the viewable area 8 of the display element 5. Accordingly, the presence of the viewer wearing the glasses 10 can be confirmed without consuming the power of the glasses power supply 16, so that the glasses 10 can further save power.

  FIG. 5 is a diagram for explaining the behavior of the display element 5 and the glasses 10 in the stereoscopic display mode. FIG. 5A shows a change with time of an image displayed on the display element 5. FIG. 5B shows a change in driving state of the left eye shutter 35 and the right eye shutter 36 of the glasses 10 over time. FIG. 5C shows a temporal change in the blocking state of the left eye field and the right eye field of the viewer wearing the glasses 10. In the description of FIG. 5, the left-eye video and the right-eye video indicated by the stereoscopic display signal are each realized by a moving image including a plurality of frames.

  In the stereoscopic display mode, the display element 5 alternately displays the left-eye video and the right-eye video on the display surface 7 by a predetermined number of frames periodically over time based on the given stereoscopic display signal. To display. In synchronization with the switching of the left-eye video and the right-eye video on the display surface 7, the left-eye shutter 35 and the right-eye shutter 36 transmit either one of the left-eye field or the right-eye field. Either one is shut off.

  Specifically, the left-eye shutter 35 remains in the transmission state and the right-eye shutter 36 remains in the blocking state during the period in which the left-eye video is displayed on the display surface 7. As a result, the right-eye field of view is blocked, and only the left-eye field of view can view the display surface 7. During the period when the right-eye video is displayed on the display surface 7, the left-eye shutter 35 is kept in a blocking state and the right-eye shutter 36 is kept in a transmissive state. As a result, the left-eye field of view is blocked, and only the right-eye field of view can view the display surface 7. As a result, the viewer visually recognizes the right-eye video with the right eye when the right-eye video is displayed, and visually recognizes the left-eye video with the left eye when the left-eye video is displayed.

  As described above, in the video display device 1 of FIG. 1, in the stereoscopic display mode, videos from different viewpoints are viewed with the left and right eyes, respectively, so that left and right parallax occurs. The viewer recognizes that the video is displayed three-dimensionally by the illusion caused by the generated parallax. As a result, the video display device 1 can allow the viewer to stereoscopically recognize the video using the display element 5 having the flat display surface 7.

  FIG. 6 is a timing chart for explaining display mode switching in the video display device 1. In FIG. 6, the horizontal axis indicates the passage of time. FIG. 6A shows a temporal change in the presence of the viewer of the video display device 1. FIG. 6B shows the change over time of the wearing state of the viewer's glasses 10. FIG. 6C shows a change over time in the display mode of the video display device 1. FIG. 6D shows a time change of the transmission state of the synchronization signal from the receiver 20. FIG. 6E shows a change over time in the operation mode of the glasses 10. FIG. 6F shows temporal changes in the driving state of the left eye shutter 35 and the right eye shutter 36 of the glasses 10. FIG. 6G shows the temporal change of the video type indicated by the basic video signal. FIG. 6H shows a temporal change in the execution state of the plane / three-dimensional conversion processing of the video in the receiver 20.

  The video display device 1 operates, for example, in the flat display mode immediately after the operation starts. The receiver 20 in the flat display mode stops transmission of the synchronization signal, and also stops the plane three-dimensional conversion processing of the video. Therefore, when the basic video signal given immediately after the start of operation indicates a video for plane recognition, the receiver 20 generates a flat display signal from the basic video signal, and the video based on the flat display signal is flattened on the display element 5. Displayed on the display surface 7. As a result, the video display device 1 allows the viewer to clearly see the video immediately after the start of the operation.

  When the basic video signal given immediately after the start of operation indicates a stereoscopic recognition video, the receiver 20 converts, for example, the stereoscopic recognition video into a plane recognition video, and the plane indicating the converted video. A display signal is generated, and an image based on the flat display signal is displayed on the flat display surface 7 of the display element 5. As a result, the video display device 1 can allow the viewer to clearly see the video immediately after the start of the operation, regardless of the video type of the basic video signal. Further, immediately after the start of the operation of the video display device 1, the glasses 10 operate in the standby mode. The glasses 10 in the standby mode stop the operations of the left-eye shutter 35 and the right-eye shutter 36 while maintaining the transmission state. As a result, the glasses 10 in the standby mode can save power. Further, the wearing state determination unit 11 of the video display device 1 periodically determines the wearing state of the glasses 10 even during the standby mode of the glasses 10.

  If the glasses 10 are not worn at the time t0 when the viewer appears after the operation of the video display device 1 starts, the video display device 1 is kept in the flat display mode. When the viewer wears the glasses 10 at the time tx after the appearance of the viewer (hereinafter referred to as “glasses 10 wearing time tx”), in response to a signal change of the wearing sensor 13, the fact that the glasses 10 are already worn is worn. The state determination unit 11 determines. As a result, at the time t1 when it is determined that the glasses 10 have been attached (hereinafter referred to as “switching time t1”), the video display device 1 is switched from the flat display mode to the stereoscopic display mode. With the above operation, the video display apparatus 1 can automatically switch the operation mode in response to a change in the wearing state of the glasses 10.

  In FIG. 6, there is a time difference between the viewer's eyeglasses 10 wearing time tx and the switching time t1 to the stereoscopic display mode. For example, the wearing state determination unit 11 wears the glasses 10 in response to a signal from the wearing sensor 13. This is because it takes a predetermined time to determine the state. Preferably, after the viewer wears the glasses 10, the video display device 1 is switched to the stereoscopic display mode when the wearing state discriminating unit 11 continuously determines that the glasses 10 have been worn a predetermined number of times. As a result, the video display device 1 can prevent misidentification of the wearing state of the glasses 10, so that the usability can be further improved.

  In response to switching to the stereoscopic display mode, transmission of a synchronization signal from the receiver 20 is started from the time t1 when switching to the stereoscopic display mode. In response to the synchronization signal transmission, the glasses 10 are switched from the standby mode to the normal operation mode at the time t1 when switching to the stereoscopic display mode. The glasses 10 in the normal operation mode are in a state in which power can be supplied to the components related to the stereoscopic recognition of the video. As a result, the left-eye shutter 35 and the right-eye shutter 36 start selectively blocking the left-eye view and the right-eye view from the time point t1 when switching to the stereoscopic display mode. That is, from the time t1 when switching to the stereoscopic display mode, the left-eye shutter 35 and the right-eye shutter 36 alternately change the left-eye view and the right-eye view as time passes in synchronization with the synchronization signal. Cut off.

  In the example of FIG. 6, at the time point t <b> 1 when switching to the stereoscopic display mode, the basic video signal indicates a video for plane recognition. In this case, in the receiver 20, the plane recognition video of the basic video signal is converted into a stereoscopic recognition video, a stereoscopic display signal indicating the converted video is generated, and the video based on the stereoscopic display signal is displayed. It is displayed on the flat display surface 7 of the element 5. In the video based on the stereoscopic display signal, the switching timing between the left-eye video and the right-eye video is synchronized with the synchronization signal given to the glasses 10. When the viewer views the display surface 7 while wearing the glasses 10 in the normal operation mode, the displayed video is three-dimensionally recognized by the viewer. As a result, the video display device 1 can display video to the viewer during a period when it is determined that the viewer wears the glasses 10 even when the basic video signal indicates a video for plane recognition. Can be recognized three-dimensionally.

  In the example of FIG. 6, the type of video indicated by the basic video signal, that is, whether the basic video signal indicates a stereoscopic recognition video or a planar recognition video, changes with time. The video display device 1 continues the stereoscopic display mode if the glasses 10 remain worn by the viewer when the video type indicated by the basic video signal changes.

  Specifically, at the time t2 when the video type indicated by the basic video signal is switched from the video for plane recognition to the video for stereoscopic recognition, if the glasses 10 remain worn by the viewer, the receiver 20 Then, the conversion process from the image for plane recognition to the image for stereoscopic recognition is stopped. After the planar / stereo conversion process is stopped, the receiver 20 directly generates a stereoscopic display signal from the basic video signal, and an image based on the stereoscopic display signal is displayed on the flat display surface 7 of the display element 5. When the viewer views the display surface 7 while wearing the glasses 10 in the normal operation mode, the displayed video is three-dimensionally recognized by the viewer.

  If the glasses 10 remain worn by the viewer at time t3 when the video type indicated by the basic video signal is switched from the stereoscopic recognition video to the planar recognition video, the receiver 20 performs the planar recognition. The conversion process from the video for video to the video for stereoscopic recognition is resumed. After the planar / stereo conversion process is resumed, the receiver 20 converts the plane recognition video indicated by the basic video signal into a stereoscopic recognition video, generates a stereoscopic display signal indicating the converted video, and generates the stereoscopic display signal. An image based on the image is displayed on the flat display surface 7 of the display element 5. When the viewer views the display surface 7 while wearing the glasses 10 in the normal operation mode, the displayed video is three-dimensionally recognized by the viewer.

  In this manner, in the video display device 1, since the display signal generation method is automatically switched in response to switching of the video type of the basic video signal, the viewer is aware of switching of the video type of the basic video signal. Without any problem, the stereoscopic recognition of the video can be continued. As a result, the viewer can stereoscopically recognize the video within the period in which the glasses 10 are worn by the viewer regardless of the video type of the basic video signal, so that the usability of the video display device 1 is improved.

  When the viewer removes the glasses 10 at the time ty during execution of the stereoscopic display mode (hereinafter referred to as “glasses 10 removal time ty”), the glasses 10 are not worn in response to a signal change of the wearing sensor 13 or the like. Is determined by the wearing state determination unit 11. As a result, at the time t4 when it is determined that the glasses 10 are not worn (hereinafter referred to as “switching time t4”), the video display device 1 is switched from the stereoscopic display mode to the flat display mode. With the above operation, the video display apparatus 1 can automatically switch the operation mode in response to a change in the wearing state of the glasses 10.

  In FIG. 6, there is a time difference between the viewer's eyeglasses 10 removal time ty and the switching time t4 to the flat display mode, for example, the wearing state in response to the signal of the wearing sensor 13 as in the case of wearing the glasses 10. This is because it takes a predetermined time to determine the mounting state of the determination unit 11. Preferably, after the viewer's eyeglasses 10 are removed, the video display device 1 is switched to the flat display mode when the wearing state discriminating unit 11 continuously determines that the glasses 10 are not worn a predetermined number of times. As a result, the video display device 1 can prevent misidentification of the wearing state of the glasses 10, so that the usability can be further improved.

  In response to the switching to the flat display mode, the transmission of the synchronization signal is stopped from the time t4 when the switching to the flat display mode is performed, and the flat three-dimensional conversion process of the video is also stopped. Therefore, when the basic video signal given immediately after the start of operation indicates a video for plane recognition, the receiver 20 directly generates a flat display signal from the basic video signal, and the video based on the flat display signal is displayed on the display element 5. Are displayed on the flat display surface 7. As a result, the video display device 1 can allow the viewer to clearly see the video even after the switching time t4 to the flat display mode.

  At time t4 when switching to the flat display mode, the glasses 10 are switched from the normal operation mode to the standby mode in response to the stop of the synchronization signal. As a result, the power supply to the left-eye shutter 35 and the right-eye shutter 36 is stopped from the time point t4 when switching to the flat display mode, and the left-eye shutter 35 and the right-eye shutter 36 are kept in the transmission state. Stop it. As a result, the glasses 10 can save power from the time t4 when switching to the flat display mode. For example, even if the viewer leaves the viewable area 8 after the time t4 when switching to the flat display mode, waste of power consumption does not occur in the glasses 10.

  When the basic video signal indicates a video for stereoscopic recognition after the time t4 when switching to the flat display mode, for example, in the receiver 20, the video for stereoscopic recognition is converted into a video for plane recognition. A flat display signal indicating the converted video is generated, and the video based on the flat display signal is displayed on the flat display surface 7 of the display element 5. As a result, the video display device 1 allows the viewer to clearly see the video regardless of the video type of the basic video signal even after the viewer removes the glasses 10.

  As described above, the video display device 1 in FIG. 1 responds to a change in the wearing state of the glasses 10 of the viewer, that is, in response to a change in the stereoscopic recognition state of the video by the viewer. Automatically switch to flat display mode. As a result, the video display device 1 can always provide clear video to the viewer while reducing the effort of the viewer.

  The video display device 1 automatically switches the display signal generation method in response to a change in the video type indicated by the basic video signal as well as a change in the wearing state of the viewer's glasses 10. In other words, the video display device 1 allows the viewer to wear the glasses 10, that is, while the viewer desires stereoscopic recognition of the video, regardless of the change in the video type indicated by the basic video signal. 3D recognition of the video. This further improves the usability of the video display device 1.

  In the example of FIG. 6, the video display device 1 determines the wearing state of the viewer's glasses 10 even during the flat display mode. The video display apparatus 1 may perform the presence / absence of the viewer wearing the glasses 10 only while the synchronization signal from the receiver 20 is received by the glasses 10. In this case, for example, the viewer directly operates the video display device 1 to instruct that the viewer should shift to the stereoscopic display mode, and the video display device 1 instruction starts transmission of a synchronization signal in response to the instruction. . As a result, determination of the wearing state of the glasses 10 is started after the transmission of the synchronization signal is started. Thus, even in the configuration in which the wearing state of the glasses 10 is determined only during the reception period of the synchronization signal, the video display device 1 always provides a clear video to the viewer while reducing the effort of the viewer. Can do.

  FIG. 7 is a flowchart for explaining a first example of basic operations on the receiver 20 side. In the example of FIG. 7, schematically, the video display device 1 determines whether or not a stereoscopic recognition of a video is possible, such as a viewer wearing glasses 10 for stereoscopic recognition of the video, The operation mode of the video display device is switched to the stereoscopic display mode or the flat display mode according to the recognition ability, thereby allowing the viewer to clearly recognize the video. After the receiver 20 of the video display device 1 is activated, the process proceeds from step A0 to step A1. In step A1, the stereoscopic display function of the video display device 1 is activated prior to the mode switching of the video display device 1. The stereoscopic display function is various functions for stereoscopic recognition of video in the video display device 1. Generation and transmission of synchronization signals, generation of stereoscopic display signals, and the left eye shutter 35 and the right eye shutter 36 of the glasses 10. Including selective shutoff operation.

  In step A2, the controller 23 of the receiver 20 operates as the mounting state determination unit 11 and resets a counter c for counting the number of mounting state determinations to zero. In step A3, the process waits for a viewing permission / non-permission signal indicating the capability of stereoscopic recognition of video to be transmitted from the glasses 10. When the viewing availability signal from the glasses 10 is received by the receiver 20, in step A4, the controller 23 of the receiver 20 operates as the wearing state determination unit 11, and the glasses 10 are worn based on the viewing availability signal. It is determined whether or not three-dimensional recognition of the video is possible.

  When it is determined that the three-dimensional recognition of the video is impossible, the process proceeds from step A4 to step A5. In step A5, 1 is added to the current value of the mounting state discrimination counter c to update it. After the counter c is incremented, the process proceeds from step A5 to step A6, where it is determined whether or not the updated value of the counter c has exceeded an upper limit value C of the predetermined number of mounting state determinations. If the updated value of the counter c is less than or equal to the upper limit value C, the process returns from step A6 to step A3 to wait for reception of the next viewing permission / inhibition signal. The mounting state determination process in steps A3 to A6 is repeated until it is determined in step A4 that the three-dimensional recognition of the video is possible, or until the value of the updated counter c exceeds the upper limit value C.

  If it is determined in step A4 that the stereoscopic recognition of the video is possible, the process proceeds from step A4 to step A7. In step A7, the receiver 20 is switched to the stereoscopic display mode and starts an operation related to the stereoscopic recognition of the video. After switching the stereoscopic display mode, in step A8, the controller 23 of the receiver 20 operates as the display control unit 4 and causes the synchronization signal generation unit 26 to generate a synchronization signal corresponding to a predetermined reference number N frames. It transmits from the transmission part 21. After transmitting the synchronization signal, the process returns to step A2.

  When the synchronization signal of the reference number N frames is received after the stereoscopic display mode is switched, the glasses 10 performs the selective blocking operation of the left-eye shutter 35 and the right-eye shutter 36 in synchronization with the synchronization signal. , Only a predetermined N frames of the synchronization signal are performed. In addition, the display control unit 4 of the receiver 20 generates a stereoscopic display signal for displaying an image including a reference number N of frames and causes the display element 5 to display an image of N frames.

  The reason why the synchronization signal is transmitted for N frames in step A8 is to adjust the frequency of checking the viewing permission signal. The check frequency of the viewing permission / inhibition signal can be adjusted according to how many frames the synchronization signal is sent.

  If it is determined in step A6 that the three-dimensional recognition of the video is impossible by the number exceeding the upper limit value C of the number of wearing state determinations, the process proceeds from step A6 to step A9. In step A9, the receiver 20 is switched to the flat display mode, and starts an operation related to video plane recognition. After the plane display mode is switched, the processing in FIG. 7 is terminated in step A10.

  After switching to the flat display mode, for example, the glasses 10 shift to the standby mode, the generation and transmission of the synchronization signal is stopped, the flat display signal is generated from the basic video signal, and the display element 5 displays the video for flat display. . Further, for example, if the basic video signal indicates a video for stereoscopic recognition in the flat display mode, a stereoscopic display conversion process may be performed to generate a flat display signal based on the converted video.

  Through the processing of FIG. 7 described above, the video display device 1 automatically switches between the stereoscopic display mode and the flat display mode according to the wearing state of the glasses 10, that is, according to the capability of stereoscopic recognition of the viewer's video. Switch. Thereby, when the viewer does not wear the glasses 10, the video display device 1 can prevent the viewer from clearly recognizing the video by erroneously switching to the stereoscopic display mode. it can. In addition, the process is switched to the flat display mode only when the number of times that the glasses 10 are not worn is determined by the number of times exceeding the upper limit C by the processing of Step A2 to Step A7. As a result, the video display device 1 can prevent erroneous recognition of the glasses 10 not being worn.

  FIG. 8 is a flowchart for explaining the basic operation on the glasses 10 side in response to the basic operation on the receiver 20 side. Schematically, the glasses 10 determine whether or not the glasses 10 are worn for stereoscopic image recognition, and the determination result is transmitted to the receiver 20, and in response to the synchronization signal from the receiver 20. Thus, the glasses 10 perform operations necessary for stereoscopic recognition of the video. Further, the glasses 10 drive the left eye shutter 35 and the right eye shutter 36 in response to the synchronization signal transmitted in the stereoscopic display mode, and determine the wearing state of the glasses 10 during the shutter driving.

  After the video display device 1 is activated, the process proceeds from step B0 to step B1. In step B <b> 1, the controller 33 of the glasses 10 waits for the glasses power supply 16 to be in a state in which power can be supplied to the components related to stereoscopic image recognition, for example, when the operator operates the power switch 37. When the glasses power supply 16 is ready to be supplied, the process proceeds from step B1 to step B2.

  In step B2, the controller 33 of the glasses 10 operates as the wearing state determination unit 11 and resets the counter cc for counting the number of times of wearing state determination to 0. In step B <b> 3, the controller 33 of the glasses 10 operates as the wearing state determination unit 11 and checks the wearing state of the glasses 10 based on a signal from the wearing sensor 13. In step B <b> 4, the controller 23 of the glasses 10 operates as the wearing state determination unit 11 and determines whether or not the glasses 10 are worn, that is, whether or not a three-dimensional image can be recognized.

  When it is determined that the three-dimensional recognition of the video is impossible, the process proceeds from step B4 to step B5. In step B5, 1 is added to the current value of the wearing state determination counter cc to be updated. After the counter cc is incremented, the process proceeds from step B5 to step B6, where it is determined whether or not the updated value of the counter cc exceeds an upper limit value CC of the predetermined number of wearing state determinations. If the updated value of the counter cc is equal to or less than the upper limit value CC, the process returns from step B6 to step B3 and waits for the next signal output from the mounting sensor 13. The mounting state determination process in Steps B3 to B6 is repeated until it is determined in Step B4 that stereoscopic image recognition is possible, or until the updated counter cc value exceeds the upper limit value CC in Step B6. .

  If it is determined in step B4 that the three-dimensional recognition of the video is possible, the process proceeds from step B4 to step B7. In step B <b> 7, the controller 33 of the glasses 10 operates as the wearing state determination unit 11, and receives a viewing OK signal indicating that stereoscopic video recognition is possible as a viewing permission signal indicating whether stereoscopic video recognition is possible. To the machine 20.

  In step B <b> 8, the controller 33 of the glasses 10 checks whether or not the synchronization signal transmitted from the receiver 20 is received by the receiving unit 32 of the glasses 10. In step B9, it is determined whether or not a synchronization signal is received. If the synchronization signal has not been received, the process returns from step B9 to step B7, and the viewing OK signal is transmitted again. Steps B7 to B9 are repeated until a synchronization signal is obtained.

  When the synchronization signal from the receiver 20 is received, the process proceeds from step B9 to step B10. In step B10, since the video display device 1 is switched to the stereoscopic display mode, the glasses 10 also shift to the normal operation mode and start the operation related to the stereoscopic recognition of the video.

  After switching the stereoscopic display mode, the controller 33 of the glasses 10 receives the synchronization signal transmitted from the receiver 20 in step B11. In Step B12, the controller 33 of the glasses 10 generates a left / right switching signal for controlling the switching timing of the blocking state of the left eye shutter 35 and the right eye shutter 36 based on the synchronization signal. The left / right switching signal indicates, for example, a value of “0” or “1” in response to which of the left-eye shutter 35 and the right-eye shutter 36 is set to the transmissive state. In step B13, it is determined whether or not the left / right switching signal is “0” indicating transmission of the left-eye shutter.

  When the left / right switching signal is “0”, the right eye side view is blocked by the shutter drive circuit 34 switching the right eye shutter 36 to the blocking state in step B14. Further, in step B15, the shutter drive circuit 34 switches the left eye shutter 35 to the transmission state, thereby transmitting the left eye side view.

  Conversely, if the left / right switching signal is “1” indicating transmission of the right-eye shutter, the shutter drive circuit 34 switches the left-eye shutter 35 to the shut-off state in step B <b> 16, so that the left-eye side view is changed. Blocked. Further, in step B17, the shutter drive circuit 34 switches the right eye shutter 36 to the transmission state, thereby transmitting the right eye side field of view. After the shutter is driven, the process returns from step B15 and step B17 to step B2.

  When the updated counter cc value exceeds the upper limit value CC in step B6, the process proceeds from step B6 to step B18. In step B <b> 18, the controller 33 of the glasses 10 operates as the wearing state determination unit 11, and as a viewing availability signal indicating whether or not the stereoscopic recognition of the video is possible, a viewing impossible signal indicating that the stereoscopic recognition of the video is impossible Transmit to the receiver 20.

  In Step B19, the controller 33 of the glasses 10 stops the supply of power from the glasses power supply 16 to the components related to the stereoscopic recognition of the video. As a result, the glasses 10 are switched to the standby mode. After the power supply is stopped, the process of FIG. 8 ends in step B20.

  With the process of FIG. 8 described above, the video display device 1 can switch between the stereoscopic display mode and the flat display mode according to the wearing state of the glasses 10, that is, according to the capability of stereoscopic recognition of the viewer's video. it can. In addition, the process is switched to the flat display mode only when it is determined by the processes in steps B2 to B6 that the glasses 10 are not worn by the number of times exceeding the upper limit CC. As a result, the video display device 1 can prevent erroneous recognition of the glasses 10 not being worn. Furthermore, since the power supply of the eyeglass power supply 16 is stopped when shifting to the flat display mode, the power of the eyeglasses 10 can be saved.

  FIG. 9 is a flowchart for explaining a second example of the basic operation on the receiver 20 side. The basic operation on the side of the glasses 10 in response to the second example of the basic operation of the receiver 20 in FIG. 9 is based on the example in FIG.

  After the receiver 20 of the video display device 1 is activated, the process proceeds from step D0 to step D1. In step D1, prior to the mode switching of the video display device 1, the controller 23 of the receiver 20 operates as the wearing state determination unit 11, and a viewing permission / non-permission signal indicating the capability of stereoscopic recognition of video is transmitted from the glasses 10. Wait for that. When the viewing availability signal from the glasses 10 is received by the receiver 20, in step D2, the controller 23 of the receiver 20 operates as the wearing state determination unit 11, and the glasses 10 are worn based on the viewing availability signal. It is determined whether or not three-dimensional recognition of the video is possible.

  If it is determined in step D2 that stereoscopic recognition of the video is impossible, the process proceeds from step D2 to step D3. In step D3, the receiver 20 is switched to the flat display mode, and performs various operations related to flat surface recognition. That is, transition to the standby mode of the glasses 10, generation of a plane display signal, display of a plane recognition video, and the like are performed. After switching to the flat display mode, the process returns from step D3 to step D1, and waits for the next viewing permission signal. Of course, it may be configured to switch to the flat display mode when the determination that the three-dimensional recognition of the video in step D2 is impossible is continued a plurality of times.

  When it is determined in step D2 that the three-dimensional recognition of the video is possible, the process proceeds from step D2 to step D4. In step D4, the controller 23 of the receiver 20 operates as the display controller 4, and based on the determination result of the stereoscopic image determiner 25 of the receiver 20, the video indicated by the basic video signal is used for stereoscopic recognition and plane recognition. Find out which one is.

  In step D5, it is determined whether or not the basic video signal indicates a stereoscopic recognition video. If the basic video signal indicates an image for plane recognition instead of stereoscopic recognition, the process proceeds from step D5 to step D6. In step D <b> 6, the controller 23 of the receiver 20 operates as the display control unit 4 and converts the plane recognition video indicated by the basic video signal into a stereoscopic recognition video. In this case, a stereoscopic display signal is generated based on the converted video. After the plane / three-dimensional transformation, the process proceeds to step D7. When the basic video signal indicates a stereoscopic recognition video, the process proceeds directly from step D5 to step D7. In this case, a stereoscopic display signal is directly generated from the basic video signal.

  In step D7, the receiver 20 is switched to the stereoscopic display mode, and performs various operations related to the stereoscopic recognition of the video. That is, transition to the normal operation mode of the glasses 10, generation and transmission of a synchronization signal, generation of a stereoscopic display signal, display of an image for stereoscopic recognition, and the like are performed. After switching the stereoscopic display mode, the process returns from step D7 to step D1, and waits for the next viewing permission signal.

  Through the processing of FIG. 9 described above, the video display device 1 switches between the stereoscopic display mode and the flat display mode according to the wearing state of the glasses 10, and in the stereoscopic display mode, the viewer is independent of the video type of the basic video signal. 3D recognition of the video. This further improves the usability of the video display device 1.

  FIG. 10 is a flowchart for explaining a third example of the basic operation on the receiver 20 side. The basic operation on the side of the glasses 10 in response to the third example of the basic operation of the receiver 20 in FIG. 10 is based on, for example, Step B8 to Step B17 in FIG.

  In the example of FIG. 10, the video display device 1 is in a state in which the video can be three-dimensionally recognized based on the video analysis of the video in the viewable area 8 of the display surface 7 shot by the shooting unit 14 on the receiver 20 side. The operation mode of the video display device is switched to the 3D display mode or the flat display mode according to whether or not the 3D recognition is possible, so that the viewer can clearly recognize the video.

  After the receiver 20 of the video display device 1 is activated, the process proceeds from step E0 to step E1. In step E1, the video display device 1 is waited for an instruction to switch the operation mode of the video display device 1. The instruction to switch the operation mode of the video display device 1 is performed, for example, when the viewer directly operates a remote control key provided in the video display device 1 or a key provided in the receiver 20. Further, the fact that the fact that the basic video signal indicates a stereoscopic recognition video is detected may be regarded as the switching instruction. If there is the switching instruction, the process proceeds from step E1 to step E2.

  In step E <b> 2, the controller 23 of the receiver 20 functions as the wearing state determination unit 11 and causes the photographing unit 14 of the receiver 20 to photograph the video in the predetermined viewable area 8. The viewable area 8 is an area facing the display surface 7 of the display element 5, and is an area where the viewer wearing the glasses 10 can see the display surface 7. The video imaged by the imaging unit 14 may be either a still image or a moving image.

  In step E3 to step E9, the controller 23 of the receiver 20 functions as the mounting state determination unit 11. The wearing state determination unit 11 determines whether there is a viewer wearing the glasses 10 in the viewable region 8 by analyzing the video of the viewable region 8 photographed by the photographing unit 14.

  As a specific example, in step E3, the video of the viewable area 8 photographed by the photographing unit 14 is analyzed. In the analysis of the video, for example, whether or not glasses 10 are reflected in the video in the viewable area 8 and whether or not the viewer wearing the glasses 10 is reflected in the video in the viewable area 8. Is investigated.

  In step E4, it is determined whether or not glasses 10 are present in the viewable area 8 based on the video analysis result. When it is determined that the glasses 10 are not present in the viewable area 8, it is determined that the viewer cannot recognize the three-dimensional video, and the process returns from step E4 to step E1 to wait for the next switching instruction. The first determination process of the wearing state in steps E2 to E4 is repeated until the presence of the glasses 10 in the viewable area 8 is confirmed in step E4.

  If it is determined in step E4 that the glasses 10 are present in the viewable area 8, the process proceeds from step E4 to step E5. In step E5, the counter c for counting the number of wearing state determinations is reset to zero. In step E6, it is determined whether or not there is a viewer wearing the glasses 10 in the viewable area 8 based on the video analysis result. If there is no viewer wearing the glasses 10, that is, if it is determined that stereoscopic recognition of the video is impossible, the process proceeds from step E6 to step E7.

  In step E7, the processing for determining the capability of video stereoscopic recognition is on standby for a predetermined standby time tv seconds. After the standby, in step E8, 1 is added to the current value of the mounting state determination counter c and updated. After the counter c is incremented, the process proceeds from step E8 to step E9, where it is determined whether or not the updated value of the counter c has exceeded the upper limit value C of the predetermined number of wearing state determinations. If the updated value of the counter c is equal to or less than the upper limit C, the process returns from step E9 to step E6 to wait for the video analysis result of the next viewable area 8. The second determination process of the wearing state in steps E6 to E9 is repeated until it is determined in step E6 that there is a viewer who has already worn the glasses 10, or until the value of the updated counter c exceeds the upper limit value C. It is.

  If it is determined in step E6 that there is a viewer who has already worn the glasses 10, that is, if it is determined that stereoscopic video recognition is possible, the process proceeds from step E6 to step E10. In step E10, the receiver 20 is switched to the stereoscopic display mode and starts an operation related to the stereoscopic recognition of the video. After switching the stereoscopic display mode, in step E11, the controller 23 of the receiver 20 operates as the display control unit 4 and causes the synchronization signal generation unit 26 to generate synchronization signals for the reference number M frames from the transmission unit 21. Send. After transmitting the synchronization signal, the process returns to step E2. Thereby, the display of the image for M frames on the display surface 7 and the selective blocking operation of the left eye shutter 35 and the right eye shutter 36 synchronized with the image are executed.

  When it is determined in step E9 that the three-dimensional recognition of the video is impossible by the number of times exceeding the upper limit value C of the number of wearing state determinations, the process proceeds from step E9 to step E12. In step E12, the receiver 20 is switched to the flat display mode, and starts an operation related to video plane recognition. After the plane display mode is switched, the process of FIG. 10 is terminated in step E13. After switching to the flat display mode, for example, the glasses 10 shift to the standby mode, the generation and transmission of the synchronization signal is stopped, the flat display signal is generated from the basic video signal, and the display element 5 displays the video for flat display. .

  Through the processing of FIG. 10 described above, the video display device 1 can perform the three-dimensional recognition capability of the viewer's video according to the wearing state of the glasses 10 determined based on the video analysis result of the video in the viewable area 8. If the answer is NO, the stereoscopic display mode and the flat display mode are switched. As a result, the video display device 1 can make the viewer always clearly recognize the video without complicating the configuration of the glasses 10.

  The reason why the synchronization signals for M frames are transmitted in step E11 in FIG. 10 is to adjust the frequency of checking the viewable area 8. The check frequency of the viewable area 8 can be adjusted according to how many frames the synchronization signal is sent. The check of the viewable area 8 is not limited to being repeated at a predetermined time cycle. For example, the state change of the viewable area 8 using a distance measuring sensor and a human sensor provided in the receiver 20 separately from the imaging unit 14, That is, the viewable area 8 may be checked at the time when the viewer's entry / exit is detected and the state of the viewer in the viewable area 8 changes.

  In the example of FIG. 10, the determination processing of the ability to recognize video stereoscopic recognition based on the captured video of the viewable area 8 includes first determination processing for determining the presence / absence of the glasses 10 and the presence / absence of the viewer wearing the glasses 10. There are two stages of the second discrimination process. As a result, since the viewer can be switched to the stereoscopic display mode only when the viewer wearing the glasses 10 is surely present in the viewable area 8, the video display of FIG. The apparatus 1 can improve the accuracy with which the viewer can clearly recognize the video.

  In the example of FIG. 10, since the video display device 1 grasps the state change of the viewable area 8 by video analysis, the video display device 1 operates in an operation mode based on the presence or absence of the viewer wearing the glasses 10. In addition to switching, the viewer may be encouraged for clear video recognition. Encouraging viewers for clear video recognition is achieved, for example, by inviting viewers to wear glasses 10 and inviting viewers to move to an appropriate location for stereoscopic video display. Is done. Thereby, the video display apparatus 1 of FIG. 1 can make a viewer recognize a video more clearly.

  The video display device 1 according to the above-described embodiment is one of the best embodiments of the constituent elements of the present invention. The detailed configuration of the constituent elements of the present invention is not limited to the above-described configuration as long as the above-described effects can be exhibited, and various other configurations may be used. The video display device according to the present invention is an effective technique for a device that displays a video that can be stereoscopically recognized as well as a video display device that receives a broadcast of a video that can be stereoscopically recognized, and has a wide range of applications.

DESCRIPTION OF SYMBOLS 1 Image display apparatus 3 Display signal production | generation part 4 Display control part 5 Display element 7 Display surface 10 of display elements Glasses 11 Wearing state discrimination | determination part 13 Wear sensor 14 Image | photographing part 16 Power supply 17 for glasses 17 Power supply control part 20 Receiver 21 Receiver of receiver Transmitter 22 Receiver 23 of the receiver Receiver controller 24 Video input terminal 25 Stereo image discriminator 26 Synchronization signal generator 27 Stereo display signal generator 28 Planar display signal generator 29 Stereoplanar display selector 30 View control mechanism 31 Glasses transmission unit 32 Glasses reception unit 33 Glasses controller 34 Shutter drive circuit 35 Left eye shutter 36 Right eye shutter 37 Power switch 41 Decoding unit 42 Timing signal generation unit 44 Switch circuit 45 Left eye shutter drive circuit 46 Right Eye shutter drive circuit 50 Eyeglass frame 51 Deployment sensor 52 Proximity sensor SA 53 Objective sensor 54 Transmission element 55 of the objective sensor Reception element 56 of the objective sensor Reflector plate 57 Transmitter 58 for the mounting sensor Receiver for the mounting sensor

Claims (8)

Based on the video signal representing the video, it is possible to selectively generate a stereoscopic display signal for stereoscopically recognizing the video of the video signal and a flat display signal for causing the video of the video signal to be planarly recognized. Display signal generating means,
It is determined whether or not the image can be stereoscopically recognized, and the display signal generating unit generates the stereoscopic display signal only when the stereoscopic recognition is possible. When the stereoscopic recognition is not possible, the planar display signal is generated. Display control means,
A display signal of any one of the stereoscopic display signal generated by the display signal generation means and the flat display signal generated by the display signal generation means is given, and an image based on the given display signal is displayed flat. A display device comprising a display element for displaying on a surface. Glasses for allowing a viewer to stereoscopically recognize a video displayed on the display element based on the stereoscopic display signal;
A wearing state discriminating means for discriminating a wearing state of the glasses to a viewer;
The video display device according to claim 1, wherein the display control unit generates the stereoscopic display signal when the glasses are worn based on a determination result of the wearing state determination unit. A wear sensor that is attached to the glasses and emits different signals in a state where the glasses are worn by a viewer and a state where the glasses are not worn;
The video display device according to claim 2, wherein the wearing state discriminating unit discriminates the wearing state of the glasses in response to a signal output from the wearing sensor. An image capturing means for capturing a viewable area that is provided along with the display element and faces a display surface of the display element;
The wearing state discriminating unit discriminates the wearing state of the glasses by analyzing the video of the viewable area taken by the photographing unit and discriminating whether or not there are viewers wearing the glasses in the viewable area. The video display device according to claim 2, wherein:   The wearing state determination means repeatedly determines the wearing state of the glasses every predetermined time period, and when it is determined that the glasses are not worn continuously for a predetermined number of times, the glasses state is not worn. The video display apparatus according to claim 2, wherein a discrimination result is given to the display control unit. A power supply for glasses that is attached to the glasses and that supplies power used to drive the glasses for stereoscopic recognition of the video;
6. The apparatus according to claim 2, further comprising: a power control unit that responds to the wearing state determination unit and stops power supply from the glasses power supply when the glasses are not worn. The video display device according to item.   The display control means determines whether or not a three-dimensional image can be recognized every predetermined time period, and each time a determination result is obtained, the three-dimensional display signal or the flat display is based on the determination result. The video display device according to claim 1, wherein a signal is generated. The video signal alternately indicates a stereoscopic recognition image or a planar recognition image as time passes,
The display signal generating means, when the display control means determines that the video can be stereoscopically recognized, if the video signal indicates a stereoscopic recognition video, the stereoscopic signal indicating the stereoscopic recognition video. If a display signal is generated and the video signal indicates a video for plane recognition, the plane recognition video is converted into a video for stereoscopic recognition, and the stereoscopic display signal indicating the converted video is generated. The video display device according to claim 1, wherein the video display device is a video display device.