Abstract:
A method for operating a display device Involves displaying at least one virtual object from a virtual observation position by virtual reality glasses, continuously detecting a position of the virtual reality glasses, determining, using the continuously detected position of the virtual reality glasses, whether the glasses are disposed in a specified region, and displaying the virtual object from the same virtual observation position by means of the display device as long as the virtual reality glasses are disposed in the specified region. A system includes virtual reality glasses.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is based on and hereby claims priority to German Application No. 10 2014 009 699.8 filed on Jun. 26, 2014, the contents of which are hereby incorporated by reference. 
     BACKGROUND 
     The invention relates to a method for operating a display device and a system with a display device. 
     Virtual reality glasses are increasingly used for example to support realistic product presentations during a sales talk. Virtual reality glasses are a certain form of a so-called head-mounted display, which is a visual output device worn on the head. It presents images on a display screen close to the eye or projects them directly onto the retina. In addition, virtual reality glasses also have sensors for detecting displacement of the head. This enables the display of the calculated illustration to be adapted to the movement of the wearer of the glasses. As a result of the physical proximity, the displayed image areas of the head-mounted display appear significantly larger than the free-standing display screens and in the extreme case even cover the entire field of view of the user. Because the display follows all head movements of the wearer as a result of the head mounting, he gets the impression of moving directly in a landscape generated by a computer. 
     By such virtual reality glasses therefore, a type of virtual reality can be displayed, wherein the display and simultaneous perception of reality in its physical properties in an interactive virtual environment that is computer generated in real time is usually referred to as virtual reality. 
     In particular, if such virtual reality glasses are used for the presentation of a virtual product, it can be of interest that the image that is currently being seen by a user wearing the virtual reality glasses can also be displayed on an external display screen. This can for example be used to allow a salesperson and/or an associate of the user of the virtual reality glasses to see the same as the user wearing the virtual reality glasses sees. A challenge in this connection is to be able to decide, using suitable criteria, when the image displayed to the user by the virtual reality glasses should also be displayed on an external monitor. 
     SUMMARY 
     It is one possible object to provide a method for operating a display device and a system with a display device by which it can be determined in a simple manner when an image displayed by the virtual reality glasses should also be displayed by means of the display device. 
     The inventor proposes a method for operating a display device, at least one virtual object is displayed from a virtual observation position by virtual reality glasses. During this a position of the virtual reality glasses is continuously detected. Using the continuously detected position of the virtual reality glasses, it is determined whether said glasses are in a specified region. The virtual object is displayed from the same virtual observation position by the display device while the virtual reality glasses are disposed in the specified region. 
     It is thus provided to continuously check whether the virtual reality glasses are disposed in a specified region. Using said criterion it is decided whether the image reproduced by the virtual reality glasses should be reproduced on the display device that is different from the virtual reality glasses, for example a computer display screen, a television screen or similar, for example for other observers. The proposals are based on the knowledge that the display by an external display device of similar contents as the wearer of the virtual reality glasses can see only makes sense while the virtual reality glasses are also actually being worn by a user. 
     If the user removes the virtual reality glasses, the position of the virtual reality glasses changes automatically such that the glasses are disposed outside of the specified region. Using said information, it can be determined in a simple way that the image possibly still being displayed as above by the virtual reality glasses is no longer relevant for other people, so that the image is also no longer displayed on the external display device. 
     The specified region corresponds here to a defined volume, for example a cube with a cubic meter spatial content, which is disposed about the head of the user wearing the virtual reality glasses so that the head is substantially disposed centrally within said cube. However, the volume and the dimensions of the specified region can also be selected to be larger for example. It is crucial that the specified region is chosen to be large enough for a preferably seated user to be able to move his head forwards, backwards, to the left and to the right as far as he usually would do when wearing the virtual reality glasses, without leaving the specified region with the virtual reality glasses being worn. In other words, the specified region is disposed and dimensioned such that the virtual reality glasses remain within the specified region within the usual range of movement of the user. The size and arrangement of the specified region can for example also be adjusted depending on the body size of a respective user that is wearing the virtual reality glasses and/or using his respective individual range of movement while wearing the virtual reality glasses. 
     Preferably, the virtual object displayed by the display device is hidden once it is determined that the virtual reality glasses are disposed outside of the specified region. This is because it can be assumed therefrom that once the virtual reality glasses are outside of the specified region they have been taken off by the user, so that the content that may be continuing to be displayed by the virtual reality glasses is also no longer of interest for other people, because the user can no longer see said image contents because the virtual reality glasses themselves have been taken off. Alternatively, a display mode of the display device can also be set that displays the virtual object from a predetermined perspective instead of hiding the virtual object. This means that the virtual object is displayed starting from a specified virtual observation position with a virtual direction of view starting from the same specified virtual observation position. Or the display mode of the display device can also be set such that a type of virtual round trip around the virtual object is displayed. During this a virtual camera moves on a specified path around the virtual object, wherein the object is displayed on the display device from the perspective of the virtual camera. 
     Another advantageous embodiment provides that infrared light is emitted by an infrared light source disposed on the virtual reality glasses, especially two infrared LEDs, wherein the position of the virtual reality glasses is determined by a detecting device using the infrared light detected by the same. The advantage in this procedure is primarily that the infrared light cannot be perceived by the human eye, so that other people sitting or standing in the surroundings of the user wearing the virtual reality glasses are not disturbed by the infrared-based position detection. 
     According to another advantageous embodiment, it is provided that it is additionally detected whether a user has put the virtual reality glasses on, wherein the virtual object is only displayed by the display device in this case. For example, the virtual reality glasses can comprise suitable contact-sensitive sensors, which can be used in a contact region of the virtual reality glasses, which is usually in contact with the user when the virtual reality glasses are being worn, for checking whether a user has actually put the virtual reality glasses on. In other words, it is preferably not sufficient that the virtual reality glasses are disposed in the specified region. In addition, the condition must still be fulfilled that the virtual reality glasses have actually been put on by a user. This is because only in this case can it be assumed therefrom that the contents displayed by the virtual reality glasses are also seen by the user, and thus are also only at all relevant to consideration by any other people. 
     Another advantageous embodiment provides that the virtual object displayed by the display device is hidden once it is determined that the user has taken the virtual reality glasses off. 
     According to another advantageous embodiment, it is provided that a motor vehicle is displayed as the virtual object. A potential buyer can thus view for example his own special requested configuration of the motor vehicle in a simple way by the virtual reality glasses, wherein a salesperson or possibly also an associate can conveniently have the same contents displayed on the display device as are displayed to the potential buyer by the virtual reality glasses. Moreover, the use of the virtual reality glasses in the automobile context brings among other things the advantage that for example car dealerships do not need to provide a plurality of different vehicle versions with different equipment, because very different vehicle configurations can be displayed in a particularly realistic way and in a simple way by the virtual reality glasses. 
     The inventor also proposes a system that comprises a display device and virtual reality glasses, which are designed to display at least one virtual object from a virtual observation position. Moreover, the system comprises a detecting device that is designed to continuously detect a position of the virtual reality glasses and, using the continuously detected position of the virtual reality glasses, to determine whether the glasses are disposed in a specified region. Furthermore, the proposed system comprises a control device that is designed to activate the display device such that the virtual object is displayed from the same virtual observation position by the display device if the virtual reality glasses are disposed in the specified region. Advantageous embodiments of the proposed method are to be considered to be advantageous embodiments of the proposed system, wherein the system carries out the method. 
     Other advantages, features and details are revealed in the following description of preferred exemplary embodiments and using the figures. The features and combinations of features mentioned above in the description and the features and combinations of features mentioned below in the description of figures and/or shown in the figures alone are not only able to be used in the respectively specified combination, but also in other combinations or on their own without departing from the scope. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and other objects and advantages of the present invention will become more apparent and more readily appreciated from the following description of the preferred embodiments, taken in conjunction with the accompanying drawings of which: 
         FIG. 1  shows a schematic representation of a system with virtual reality glasses for displaying virtual reality content; 
         FIG. 2  shows a perspective view of a partly illustrated salesroom within a car dealership, wherein a user is wearing virtual reality glasses, by which a virtual motor vehicle is being displayed; 
         FIG. 3  shows a representation of a virtual motor vehicle that is displayed by the virtual reality glasses; 
         FIG. 4  shows a schematic frontal view of the motor vehicle displayed by the virtual reality glasses, wherein a virtual observation position of the user is identified; 
         FIG. 5  shows a schematic top view of the virtual motor vehicle, wherein again the virtual observation position of the user is identified; and 
         FIG. 6  shows a computer monitor, by which the same virtual environment is displayed together with the virtual motor vehicle as it is seen by the user through the virtual reality glasses. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. 
     In  FIG. 1  a system  10  that is identified as a whole by  10  for displaying virtual reality content is shown. The system  10  comprises a display device  12  in the form of a computer display screen. Moreover, the system  10  comprises virtual reality glasses  14 , a detecting device  16  and a control device  18 . The virtual reality glasses  14  are in the present case designed to display a virtual motor vehicle that is not shown here from diverse virtual observation positions. Moreover, two infrared LEDs  20 , by which infrared light can be emitted, are disposed on the virtual reality glasses  14 . 
     The detecting device  16  is designed to continuously detect a position of the virtual reality glasses  14  and, using the continuously detected position of the virtual reality glasses  14 , to determine whether the glasses are disposed in a specified region that is not illustrated here. For this, infrared light is emitted by the infrared LEDs  20 , wherein the position of the virtual reality glasses  14  can be determined by the detecting device  16  using said detected infrared light. Moreover, the virtual reality glasses  14  can also comprise contact-sensitive sensors, by which it can be detected whether a user that is not illustrated here has put the virtual reality glasses  14  on. 
     A salesroom  22  in an unspecified car dealership is represented in  FIG. 2 . A user  24  has put the virtual reality glasses  14  on, wherein a salesperson  26  is seated opposite the user  24 . Both the content displayed by the virtual reality glasses  14  and the content displayed by the computer display screen  12  can be controlled by the control device  18 . In  FIG. 2  the previously mentioned specified region  28  is also schematically represented in the form of a cube. The detecting device  16  can detect the position of the virtual reality glasses  14  relative to the coordinate axes x 1 , y 1  and z 1 . Moreover, the exact dimensions and the position of the specified region  28  are available to the detecting device  18 . This allows the detecting device  18  to determine in a simple way, using the detected position of the virtual reality glasses  14 , whether the glasses are located within the specified region  28 . 
     In  FIG. 3  the virtual motor vehicle  32  already mentioned above is shown, which is displayed within a virtual environment  30  by the virtual reality glasses  14 . Once the virtual reality glasses  14  are pivoted relative to the coordinate axes x 1 , y 1  and/or z 1 , there is an adjustment of the viewing angle to the virtual motor vehicle  32  by adjusting the view of the virtual motor vehicle  32  about the coordinate axes x 2 , y 2  and/or z 2  according to the detected pivoting motion of the virtual reality glasses  14 . 
     Moreover, the wearer  24  can also move his head for example in translation in the direction of the axes x 1 , y 1  and/or z 1 , wherein said movements cause a corresponding translational movement of the virtual reality glasses  14  because the user  24  is wearing the virtual reality glasses  14 . Said translational movements of the virtual reality glasses  14  are converted during this such that the virtual observation position of the user  24  changes within the virtual environment  30 . He can thus for example lean forward somewhat in order to observe the motor vehicle  32  in more detail, and can lean back somewhat in order to view the motor vehicle  32  from a greater distance and similar. 
     The virtual observation position according to  FIG. 3  is identified in  FIGS. 4 and 5  with the circle symbol  34 . As can be seen in the front view of the motor vehicle  32  in  FIG. 4  or in the top view of the vehicle  32 , the virtual observation position according to  FIG. 3  is disposed to the right of the center of the motor vehicle  32 . 
     In  FIG. 6  the display screen  12  is illustrated, wherein the same virtual environment  30  and thus the same virtual motor vehicle  32  as can be perceived by the user  24  are displayed. If the virtual viewing angle of the virtual motor vehicle  32  is changed by pivoting the head of the user  24 , then at the same time the content displayed on the display screen  12  is changed in just the same way. In other words, exactly the same is displayed on the display screen  12  as the user  24  can see through the virtual reality glasses  14 . However, this only makes sense if the user  24  has also put the virtual reality glasses  14  on, because otherwise it would be irrelevant for the salesperson  26  and possibly for another associate of the user  24  that is not shown for what the virtual reality glasses  14  are currently showing to appear on the display screen  12 , since the user  24  cannot see this because the virtual reality glasses  14  are not being worn. 
     Therefore, the position of the virtual reality glasses  14  is continuously detected by the detecting device  16  and, using the determined position of the virtual reality glasses  14 , a check is made as to whether the glasses are disposed in the specified region  28 . The motor vehicle  32  disposed within the virtual environment  30  is only displayed by the display screen  12  while the virtual reality glasses  14  are disposed in the specified region  28 . The virtual environment  30  and also the motor vehicle  32  are thus hidden once it is determined that the virtual reality glasses  14  are disposed outside of the specified region  28 . This is usually carried out if the user  24  takes the virtual reality glasses  14  off. Using the position detection of the virtual reality glasses  14  and the determination of whether the virtual reality glasses  14  are disposed within the specified region  28 , it can be determined in a fairly reliable way whether the user  24  has yet put the virtual reality glasses  14  on. 
     In addition, it can still be detected whether the user  24  has actually put the virtual reality glasses  14  on, wherein only in this case will the motor vehicle  32  be displayed within the virtual environment  30  by the display screen  12  exactly as is carried out by the virtual reality glasses  14 . For example, using suitable contact-sensitive sensors on the virtual reality glasses  14  it can be detected whether the virtual reality glasses  14  are actually currently being worn by the user  24  or whether he has already taken them off. 
     Thus if the virtual reality glasses  14  are actually still located in the specified region  28 , although the user  24  has taken them off, for example because he is currently still holding them in his hands and in front of his face, the motor vehicle  32  together with the virtual environment  30  will nevertheless no longer be displayed by the display screen  12  because in any case the user  24  will no longer be seeing the virtual environment  30  together with the virtual motor vehicle  32  because of the virtual reality glasses  14  having been taken off. 
     The invention has been described in detail with particular reference to preferred embodiments thereof and examples, but it will be understood that variations and modifications can be effected within the spirit and scope of the invention covered by the claims which may include the phrase “at least one of A, B and C” as an alternative expression that means one or more of A, B and C may be used, contrary to the holding in Superguide v. DIRECTV, 69 USPQ2d 1865 (Fed. Cir. 2004).