Abstract:
The present invention relates to an in-car computing device comprising a computer unit ( 12 ), a display screen ( 20 ) for displaying information ( 54 - 58, 82 ), a cursor ( 62 ) and option menus with individual option menu items, and a control element ( 22, 23, 24 ) for moving said cursor on the display screen two-dimensionally and for selecting of option menu items. The in-car computing device further comprises first means ( 34 ) for detecting a display region of predetermined information ( 54 - 58, 82 ) on the display, second means ( 36 ) for determining a pull-in region ( 60 ) of a predetermined size for a display region, and third means ( 30 ) for applying an operating force to said control element ( 22 ) when the cursor ( 62 ) is in said pull-in region ( 60 ) such that said cursor is moved into the corresponding display region.

Description:
CROSS-REFERENCE TO RELATED APPLICATION  
         [0001]    This application claims priority of German patent application DE 101 26 421.6 filed May 31, 2001.  
         BACKGROUND OF THE INVENTION  
         [0002]    The present invention relates to an in-car computing system comprising a computer unit, a display screen for displaying information, a cursor and option menus with individual option menu items, and a control element for moving said cursor on the display screen two-dimensionally and for selecting option menu items. The present invention also relates to a method of controlling a cursor for an in-car computing device comprising a display screen for displaying information, option menu items and a cursor, and a control element for moving said cursor and for selecting an option menu.  
           [0003]    In-car computing devices of the afore-mentioned kind are known in the art. More and more, such in-car computing devices are built into modern vehicles. The operation and control of such devices is usually achieved by a central control element, for example in form of a rotary switch button, which allows not only the selection of certain menu items but also the input of data, for example cities and streets, into a navigation system. In addition to an alphanumeric input, there is an alternative possibility with navigation systems to select the destination on a map displayed on a display screen by moving the cursor on the destination. Since the mentioned rotary switch button only allows a movement of the cursor in one direction, the input of the destination has to be carried out in two steps which makes this alternative type of input complicated. More appropriate are control elements which allow a movement of the cursor in two dimensions simultaneously. This kind of control elements, for example, comprises crossed rocker switches, sliding controllers being slidable in x and y directions and a joystick-like control element.  
           [0004]    Although the selection of the destination on the map is possible with such control elements, the operation is not very ergonomic due to outer influences within a vehicle. Particularly it is difficult for a user to move the cursor on streets displayed on the screen (only streets are useful destinations).  
           [0005]    Similar ergonomic problems also arise with other applications which require a free two-dimensional movement of the cursor for selecting any function. For example, such a function is an Internet function which allows to select randomly distributed hyperlinks by moving the cursor on the respective hyper-link. Such an input into an in-car computing device necessarily requires an eye-hand-coordination in addition, since the user is otherwise not able to recognize whether the desired location on the display screen has been reached by the cursor. Also, this fact may be improved under ergonomic considerations.  
           [0006]    Ergonomic aspects relating to standard personal computers have been discussed in DE 199 07 620 A1, DE 198 58 647 A1 or DE 44 00 790 A1, for example.  
         SUMMARY OF THE INVENTION  
         [0007]    In view of the above, the object of the present invention is to provide an in-car computing device which achieves an ergonomically improved operation, which is less demanding with respect to the eye-hand-coordination.  
           [0008]    This object is solved by the in-car computing device as mentioned before by providing a first means for detecting a display region of predetermined information on the display screen, second means for determining a pull-in (or attracting) region of a predetermined size for a display region, and third means for applying an operating force to said control element when the cursor is in said pull-in region such that said cursor is moved into the corresponding display region.  
           [0009]    Hence, the in-car computing device comprises means which operates or actuates the control element independently of the operation by the user if the cursor is in a predetermined position on the display screen relative to said predetermined information. If the cursor moves into the pull-in region of the display region of a predetermined information by manually operating the control element, or in other words, if the distance between the cursor and the display region falls below a predetermined value, said third means applies a force to said control element as to move the cursor into the display region as long as the user does not apply a larger counter-force. This “attracting” feature or characteristic of the display region and the cursor is comparable with a magnet (the display region in the present case), which magnetically attracts a magnetic material (the cursor in the present case). Here, the pull-in region generated by said second means is comparable with the sphere of activity of a magnet. Is the magnetic material outside the sphere of activity, it is not attracted. The same applies to the cursor which will not be moved into the display region if it is outside the pull-in region. The user of the in-car computing device haptically feels this behavior by moving the control element respectively. The user is in other words able to feel the attracting force of the display region.  
           [0010]    The advantage of this in-car computing device is on the one hand side that the operation is considerably simplified due to the simplified positioning of the cursor on a desired information. On the other hand side, the user “feels” the movement of the cursor and its automatic positioning on the display region via the operation of the control element without having to look at the display screen. Therewith, the demands on the hand-eye-coordination are significantly reduced.  
           [0011]    Preferably, the information displayed on the display screen are streets, which are required for inputting destinations in a navigation system. In other words, the streets of a navigation map cover particular display regions on the display screen and the second means determines a pull-in region of predetermined size associated to a display region close to the cursor. These pull-in regions are comparable with margin regions of predetermined width extending on the left and right sides of the displayed streets. If the cursor enters such a pull-in region by operating the control element, said third means will apply an operating force to the control element as to move the cursor in the display region. The user is able to feel this force and may recognize without having optical contact to the display screen that the cursor is lying on an object, for example, a street, of the navigation system.  
           [0012]    In the same manner, the information displayed on the display screen may also be so-called hyperlinks which are used in an Internet mode of the in-car computing device. Such hyperlinks are part of typical Internet pages which may be displayed on the display screen. According to the invention, a pull-in region is determined for each hyperlink. Is the cursor on a pull-in region, it will automatically be attracted on the hyperlink, wherein a respective operating force is applied to the control element.  
           [0013]    Also in this case the input and the selection, respectively, of information is significantly simplified.  
           [0014]    Preferably, the control element is a crossed rocker switch (two rocker switches arranged at right angles), a sliding controller or a toggle switch. Generally, the control element has to allow a movement of the cursor in four directions, namely x- and y-directions, so that the cursor may be positioned on any point of the display screen by operating the control element.  
           [0015]    In a preferred embodiment of the present invention, upon actuation of the control element in one of said two directions, for moving said cursor, said third means apply an operating force to said control element to move said cursor in the other direction in order to hold said cursor in the display region.  
           [0016]    This means that the cursor automatically follows the course of a street if the control element is pushed in one direction by the user. The respective movement in a perpendicular direction thereto is generated by the third means which applies an operating force to the control element.  
           [0017]    The advantage of this measure is that the user gets a feeling about the course of the street by the automatic operation of the control element. The user is only able to move the cursor off the street by overcoming the operating force caused by the third means. The result of this measure is a further improvement of ergonomics.  
           [0018]    Preferably, the magnitude of the operating force is adjustable and is preferably dependent on the type of the street.  
           [0019]    I.e. in other words, said different street types hold the cursor on the desired position with different forces which are transferred by the third means to the control element. The user is therewith able to feel the different magnitudes of the operating forces and as a result may recognize on which street type the cursor actually is. A further improvement of ergonomics of the system is, therefore, achievable.  
           [0020]    In a further embodiment of the present invention, the third means applies to said control element a force counteracting the operating force if the cursor reaches the margin of the display screen during the operation of the control element.  
           [0021]    I.e. in other words, the third means generates a limit stop which only acts if the cursor reaches the margin of the display screen. Therewith, the user is able to get a feeling about the position of the cursor within the display screen very easily. More preferably, this artificially generated limit stop will start a further function when overpressed (for example scrolling the map detail on the display screen).  
           [0022]    The object underlying the present invention is also solved by a method comprising the steps of:  
           [0023]    Detecting a display region of a predetermined information on the display screen, detecting a distance between said cursor and an adjacent display region, and automatically applying a force to said control element if the distance to a display region falls below a predetermined value, as to move the cursor onto this display region or to hold the cursor on the display region.  
           [0024]    The function underlying this method corresponds to the function already described in connection with the inventive in-car computing device, so that it is refrained from describing the function again.  
           [0025]    Preferably, the information displayed on the display screen are streets which are part of a displayed map detail of a navigation system. Preferably, the displayed information may also be hyperlinks of an Internet page.  
           [0026]    Most preferably, upon manual actuation of the control element in one of said two directions for moving said cursor, an operating force is generated, moving the cursor in the other direction so that it does not leave the display region.  
           [0027]    I.e. in other words, the control element is locked as to avoid that the cursor is moved off the preselected position and hence out of the sphere of activity by wrong operation of the control element.  
           [0028]    Most preferably, a force counteracting the manual operating force is applied to said control element, if the cursor reaches the margin of the display screen. Therewith, a limit stop for the control element is provided which may also be overcome by an increased operating force. Overcoming the “artificial” limit stop is, for example, necessary if the map detail or the Internet page displayed on the display screen is to be scrolled or turned over.  
           [0029]    Further advantages and embodiments of the present invention can be taken from the following description and the enclosed drawings.  
           [0030]    It is to be understood that the features mentioned above and those yet to be explained below can be used not only in the respective combinations indicated but also in other combinations or in isolation without leaving the scope of the present invention. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0031]    An embodiment of the invention is shown in the drawings and will be explained in more detail in the description below with reference to same. In the drawings:  
         [0032]    [0032]FIG. 1 a  is a schematic block diagram of an in-car computing device;  
         [0033]    [0033]FIG. 1 b  is a schematic illustration of a control element;  
         [0034]    [0034]FIG. 2 is a schematic diagram of a screen mask for illustrating the method according to the present invention;  
         [0035]    [0035]FIGS. 3 a  and  3   b  are two different screen masks of a navigation system; and  
         [0036]    [0036]FIGS. 4 a  and  4   b  are schematic diagrams of an Internet page, pull-in regions being shown in FIG. 4 b  for explaining the method according to the present invention.  
     
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS  
       [0037]    In FIG. 1, an in-car computing device is shown as block diagram and is referenced with reference numeral  10 . Such an in-car computing device comprises a computer unit  12 , which is, for example, a standard personal computer. Typically, the computer unit  12  is, however, adapted to the conditions within a vehicle. The computer unit  12  serves as a control center for a plurality of different peripheral devices, wherein in FIG. 1, for example, a navigation system  14 , a telephone system  16 , and an Internet communications unit  18  are shown. These peripheral systems are already employed in vehicles presently.  
         [0038]    The navigation system  14  comprises a GPS receiver, wheel and steering sensors in case of a coupled navigation, as well as a storage medium which stores navigation data. These navigation data are, for example, courses of streets. The software for calculating the routes and other necessary data runs on the computer unit  12  which on demand receives respective data from the navigation system  14 . Nowadays, it is possible to run this calculation on a central server which receives data from the in-car computing device, processes this data and sends the result back to the in-car computing device.  
         [0039]    For displaying information as well as option menus, a display screen  20  is provided and located typically in the central dashboard of a vehicle so as to be in the field of view of the driver. The display screen  20  is preferably an LCD-screen and receives signals from the computer unit  12 .  
         [0040]    For operating the computer unit  12  and hence the peripheral devices  14 - 18  which are controllable by the computer unit  12 , a control element  22  is provided. This control element  22  is provided as a sliding controller  23  (path-dependent controller) in the present embodiment which allows to be slided freely in x and y directions. Furthermore, the control element  22  allows to be rotated about the longitudinal axis and to be pushed in the direction of the longitudinal axis, so that a rotary switch button  24  is realized in addition. In FIG. 1 b , this control element  22  is shown schematically, the possible directions of movement being indicated by arrows.  
         [0041]    The in-car computing device  10  described before with the mentioned components is offered by the assignee of the present application under the commercial name “CarPC”. Moreover, the in-car computing device corresponds to systems which are presently employed in vehicles.  
         [0042]    Contrary to the prior approaches, the in-car computing device  10  in FIG. 1 a  comprises a force feedback unit and a force-applying unit  30 , respectively. This unit  30  receives control data from the computer unit  12  and serves to apply an operating force to the control element  22  in response to these data. The force is, for example, generated by electrically operated actuators which are coupled mechanically with the control element  22 . The force-applying unit  30  is configured such that a force acting in the directions indicated by arrows in FIG. 1 b  can be applied. With this force-applying unit  30 , different functions may be realized, for example it is conceivable to implement an index known from mechanical control elements. Moreover, the unit  30  also allows to prevent any movement of the control element  22  in particular directions.  
         [0043]    The computer unit  12  comprises a respective control unit  32  for controlling the force-applying unit  30 , the function of this control unit  32  being described with reference to FIGS. 2 and 3 a ,  3   b , in connection with the navigation system  14 .  
         [0044]    It is known that car navigation systems serve to show the driver the route to a destination which the user has input before. Normally, the selection of the destination is made by inputting alphanumeric characters. However, it is also possible to seek the destination on a map detail displayed on the display screen  20  and to select the desired destination by moving the cursor thereon. The control unit  32  supports the user with this selection as follows:  
         [0045]    In FIG. 2, a screen mask  50  is shown which serves to select a destination. In the displayed map detail  52 , a plurality of streets  54 ,  56 , and  58  are illustrated.  
         [0046]    The control unit  32  comprises means  34  which detects the position of the streets  54 - 58  on the display screen. Means  34  determines a display region on the display screen which is covered by the streets  54 - 58 . on the basis of this calculated display region and display regions, respectively, a unit  32  determines a margin region  60  (also called pull-in region) for each display region and to each street, respectively, on the left and right side of the respective street. These margin regions  60  are shown in FIG. 2 in gray color. The width of these margin regions may be preset by the user, wherein in the present embodiment different widths are selected and indicated with A and B. As an alternative, it is also conceivable that the width of the margin regions is selected dependent on the type of the street; for example, a large width for highways and a small width for city streets, or vice versa.  
         [0047]    It is to be noted that the margin regions  60  displayed in FIG. 2 are shown only for illustration purposes. In the normal operation mode of the navigation system, these margin regions are calculated but not displayed on the display screen  20 . Moreover, it is to be noted that it is not necessary to calculate the margin regions for all streets displayed on the display screen. Rather this serves for better understanding of the functioning of the present invention. It is sufficient to determine and calculate the margin regions for the streets directly adjacent to the cursor. In other words, the distance between the cursor and the adjacent streets is calculated.  
         [0048]    The control unit  32  further comprises a unit  38  which serves to calculate the position of the cursor on the display screen. In FIG. 2, several cursors  62   a ,  62   b  and  62   c  are shown for illustrating the function of the control unit  32 .  
         [0049]    The function of the control unit  32  is to check whether the cursor  62  is on a street  54 - 58  or in a margin region  60 , first. If this is not the case, as for example for cursor  62   a , this check is not followed by further actions.  
         [0050]    If the user moves the cursor  62   a  in the margin region  60  of the street  54  by a respective operation of the control element  22 , as for example shown by cursor  62   b , the check carried out by the control unit  32  yields the result that the cursor  62   b  is in the margin region  60 , i.e. the distance between the cursor and the street is below a predetermined distance A. The result is that the computer unit  12  supplies a control signal to the force-applying unit  30 , which actuates the control element  22  by use of respective electric actuators and independently of the user, i.e. automatically, so that the cursor  62  is moved on the street  54 , what is shown by cursor  62   c . It is to be understood that the afore-mentioned check of the cursor position and the comparison with the position of the margin region  60  is carried out continuously also during the actuation of the control element  22 .  
         [0051]    The margin region  60 , therefore, acts like a magnetic field which traps the cursor  62  and attracts the cursor on the street  54 .  
         [0052]    The advantage of the control described before is particularly that the user feels by way of the automatic actuation or operation of the control element  22  caused by the force-applying unit  30  that the cursor  62  is automatically attracted on the street. Hence, the user has not to look at the display screen  20 .  
         [0053]    In FIG. 2, a region  64  is shown in which both streets  54  and  56  intersect. Hence, the respective margin regions  60  intersect as well. The control unit  32  recognizes such an intersection and will move the cursor  62  on the street having the highest priority. The priority may be preset by the user or may be automatically generated, for example, dependent on the street type. It would be conceivable to assign the highest priority to the biggest streets (for example highways) and to assign the least priority to the least streets. In case that two streets having the same priority intersect, the decision on which street the cursor is attracted may be made randomly. A preferred solution, however, is to attract or move the cursor  62  on the intersection of both streets, where the user has then the possibility to move the cursor further on the desired street. Here, the afore-mentioned priority rule may be applied in the way that the actuation of the control element is easier in the direction of the street with the higher priority than in other directions.  
         [0054]    In this case (cursor on an intersection), upon actuating the control element the user has the impression as if the control element would be guided by a gate (like a shifting gate of a transmission).  
         [0055]    By means of the control unit  32  and the force-applying unit  30 , it is hence possible to move the cursor to the desired destination very ergonomically. The user is supported insofar as the cursor has not to be moved exactly on, for example, the desired destination street. Rather, this will be made by the system when the calculated distance to the street falls below the predetermined value. Additionally, the driver (user) receives a feedback from the force-applying unit  30  and the control element  22 , so that he is not urged to look at the display screen. Since the “magnetic effect” of the streets on the display screen does not cease when the cursor is on a street, the system also operates in the afore-mentioned manner if the user moves the cursor off the street inadvertently.  
         [0056]    If the user, however, wants to move the cursor off the street to another street, he has merely to overcome the force caused by the force-applying unit  30 , which is of course limited in terms of magnitude.  
         [0057]    With respect to FIGS. 3 a  and  3   b , a further function of the control unit  32  in combination with the force-applying unit  30  is described below.  
         [0058]    In FIG. 3 a , a map detail is shown as screen mask  50  for inputting a destination. The cursor  62  is on the street  54  drawn in FIG. 3 a . If the user wants to move the cursor  62  on this street, it is only necessary to push the control element  22  in y direction (see FIG. 1 b ). If the cursor moves into the margin region—not shown—due to the transverse course of the street  54 , the force-applying unit  30  immediately applies an operating force to the control element  22  in x direction,  50  that the cursor is moved back on the street. Hence the cursor follows the course of the street although the user operates the control element only in one direction. The user gets a feeling about the course of the street  54  by means of the control element  22 . Only if the user overpresses the operating force caused by the force-applying unit  30 , the cursor  62  leaves the street  54 .  
         [0059]    If the cursor  62  reaches the margin of the display screen  50  by the user&#39;s operation of the control element  22 , the force-applying unit  30  generates a force which simulates a limit stop. If the user overcomes this force, the map detail will be replaced by a respective neighboring map detail. Of course, other changes of the map detail, for example slowly scrolling, etc. are conceivable.  
         [0060]    If the map detail is changed, it is necessary to re-adapt the position of the control element  22 . Otherwise, particular screen regions would not be reachable any more. As to achieve a respective re-adaption, the force-applying unit  30  is activated. The unit applies to the control element a force, urging the control element into a position which corresponds to the cursor position on the screen. This process may be carried out fast and with a relative high force so that the user feels this adaption. Of course, this process may also be carried out slowly and hence hardly noticeable for the user.  
         [0061]    If the user likes to enlarge the map detail shown in FIG. 3, he may, for example, rotate the control element  22 . A map detail on an enlarged scale is shown in FIG. 3 b.    
         [0062]    If the user has found the desired destination on the map detail, he can then input this destination by activating the menu item “Enter”  66  as shown in FIG. 3 b  into the navigation system. Moreover, further menu items  68  and  70 , respectively, may be selected which, however, are not described in detail here. It is to be understood that also other option menu items or additional menu items may be displayed on the display screen  20 .  
         [0063]    In the afore-mentioned embodiment, the streets shown in a map detail, form the “magnetic” regions, which have influence on the control of the force-applying unit  30 . However, it is apparent for a person skilled in the art that any other information could also have this magnetic effect. For example, in FIGS. 4 a  and  4   b  it is shown that also so-called hyperlinks of an Internet page may have such magnetic effect.  
         [0064]    In FIG. 4 a , an Internet page  80  is illustrated which is displayed on the display screen  20  after activating the Internet communication unit  18 . Such an Internet page  80  comprises typically one or a plurality of hyperlinks which are indicated by an underline in FIGS. 4 a  and  4   b , and which are referenced by reference numeral  82 .  
         [0065]    Such hyperlinks  82  allow the user to reach other related Internet pages by moving the cursor  62  on the hyperlink  82  and activating it.  
         [0066]    Also in this case the control unit  32  detects the screen position of the hyperlink  82  and determines a margin region  60  around the display region of the hyperlink. The margin region  60  is shown in FIG. 4 b  in gray color. If the cursor is moved in the margin region  60 , the force-applying unit  30  is activated in response thereto with the result that the electric actuators operate the control element  22  such that the cursor is automatically moved on the hyperlink. By pushing the control element  22 , the user may then activate this hyperlink.  
         [0067]    The advantages of this control are similar to that already described in connection with the navigation system so that it is referred to the respective description above. However, one main advantage is that moving the cursor on hyperlinks is simplified for the user and that the user receives a feedback thereof by means of the automatic operation of the control element  22 .  
         [0068]    Similar to the afore-mentioned embodiment, the Internet page displayed on the screen is scrolled or turned over by moving the cursor to the margin of the screen and by overpressing the counteracting force (for simulating a limit stop) generated by the force-applying unit  30 .  
         [0069]    In addition to the hyperlinks  82  shown in FIG. 4 b , also menu items  66  displayed on the screen margin may have a magnetic effect so that the control unit  32  also determines a margin region  60 .  
         [0070]    Furthermore, the control unit  32  in combination with the force-applying unit  30  make sure that the user has to apply an increased operating force as to move the cursor off a hyperlink  82 . This ensures that the user is able to select a hyperlink  82  also during vibrations in the vehicle.  
         [0071]    In view of the above, it is apparent that the functions provided by the control unit  32  and the force-applying unit  30  may be applied not only to streets of a navigation system but also to any other information, for example hyperlinks of an Internet page. The in-car computing device  10  may be configured such that the user is allowed to preselect the kind of displayed information which the magnetic effect is to be assigned to.