Abstract:
An automotive display unit includes a display unit  13  ins talled in an accommodating portion  5  provided in a dashboard portion, a closing member  15  for closing and/or opening an proning in the accommodating portion  5 , a driving mechanism  17  vided with a motor  31  for driving the closing member  15 , and a control unit, wherein the motor  31  is a pulse motor with an encoder, whereby while referring to a pulse output from the pulse motor  31 , the control unit controls the driving of the motor  31  so as to adjust an opening width of the closing member  15  based on an opening or closing command inputted thereinto.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    The present invention relates to an automotive display device installed in a dashboard portion of an automotive vehicle.  
           [0003]    2. Description of the Related Art  
           [0004]    As a conventional automotive display device related to the aforesaid type of automotive display device there exists an automotive display device comprising a pop-up type display unit which is supported so as emerge from and submerge into the interior of the dashboard portion by means of a predetermined movable mechanism, and in such a display device the display unit is often adapted to pop up from the interior of the dashboard portion only when it is in use in consideration of design or protection against dust.  
           [0005]    In addition, in this conventional automotive display device, the position of the display unit is alternatively changed over only between a popped-up state in which the front of a screen of the display unit has completely popped up on the dashboard and an accommodated state in which the display unit is accommodated in the dashboard, and therefore there has been conceived no construction in which the pop-up height of the display unit is changed in a stepped fashion. Consequently, the pop-up height of the display unit is predetermined according to the size (in particular, vertical size) of a display unit to be used and therefore it is fixed. Due to this, in the conventional pip-up type display device, the construction of a supporting unit for supporting a display unit so as to pop up is specific to the size of a display unit to be used.  
           [0006]    With the conventional automotive display device described above, since the display unit is driven and displaced so as to emerge and/or submerge, in a case where touch switches are provided on the display unit, there may be caused a problem that an operation load which is applied to the display unit through the operation of the touch switch acts on the movable mechanism of the display unit as a load to thereby affect the operation of the movable mechanism.  
           [0007]    In addition, with the conventional automotive display device, since the display unit is pulled downwardly so as to be accommodated in the interior of the dashboard portion, a space is required in the interior of the dashboard for accommodating the display unit therein, and this causes a problem that the installation of the display device in the dashboard portion cannot be realized unless there is much space secured in the interior of the dashboard portion of the vehicle.  
           [0008]    Furthermore, with the conventional automotive display device, in a case where display units of different sizes are used, the constructions of supporting units for supporting the display units have to be replaced, this causing a problem that an increase in the number of components is called for.  
           [0009]    In a case where a large-sized display unit is used which is large enough to display on its screen information on car navigation or the like, it is often the case with such a display unit that a single display unit is used to display not only information on the car navigation but also information on the operation of electric equipment such as an air conditioner and time. Since such a large display area is not usually required to display the information on the operation of the electric equipment and time, there is a demand that only a part of the display area on the screen of the display unit may be used to display such information.  
           [0010]    In this case, only an upper portion of the display area of the screen of the display unit may be allowed to pop up on the dashboard for displaying the required information. However, with the conventional automotive display device, since the whole of the screen of the display unit is designed to pop up on an upper surface of the dashboard when the display unit is put in the popped-up state, an unnecessary portion of the screen of the display unit also pops up on the dashboard to thereby be viewed by the driver, this causing a problem that the driver is forced to be burdened visually.  
         SUMMARY OF THE INVENTION  
         [0011]    The invention has been made in view of the aforesaid problems, and therefore a first object of the invention is to provide an automotive display device in which a display unit can be accommodated when not in use without making it movable.  
           [0012]    A second object of the invention is to provide an automotive display device which can also be installed on an automotive vehicle in which there is not much space in the interior of a dashboard portion thereof.  
           [0013]    A third object of the invention is to provide an automotive display device in which the opening width of an accommodating portion in which a display unit is installed can be set according to the size of the display unit or an area on the screen which is in use.  
           [0014]    With a view to attaining the objects above, according to a first aspect of the invention, preferably, there is provided an automotive display device installed in a dashboard portion of an automotive vehicle, comprising; a display unit installed in an accommodating portion provided in the dashboard portion, and a closing member provided on the dashboard portion for closing and/or opening an opening in the accommodating portion.  
           [0015]    According to a second aspect of the invention, preferably, there is provided an automotive display device as set forth in the first aspect of the invention, wherein the closing member is supported on the dashboard portion rotatably around a transverse shaft in such a manner as to close and/or open the opening in vertical directions, and wherein the automotive display device further comprises; a driving mechanism for driving the closing member to rotate based on the power of a motor to thereby open and/or close the closing member, and a control means for controlling the driving of the driving mechanism in response to an external input to thereby close and/or open the closing member and adjusting an opening width of the opening in a state in which the opening is left open.  
           [0016]    According to a third aspect of the invention, preferably there is provided an automotive display device as set forth in the second aspect of the invention, wherein the motor of the driving mechanism is a servo motor with an encoder, and wherein the control means adjusts the opening width of the opening to a predetermined value based on a pulse output outputted from the motor as the motor revolves.  
           [0017]    According to a fourth aspect of the invention, preferably there is provided an automotive display device as set forth in the second aspect of the invention, wherein the display unit has a function to vary a display area on a screen where display actually takes place, and wherein the control means adjusts the opening width of the opening to a vertical width of the display area of the screen of the display unit in the state in which the opening is left open.  
           [0018]    According to a fifth aspect of the invention, preferably, there is provided an automotive display device as set forth in the second aspect of the invention, wherein the display unit comprises; a liquid crystal display panel, and a light source unit having a plurality of backlights adapted to be switched on and/or off independently of each other and provided at positions on a back of said liquid crystal display panel which correspond, respectively, to a plurality of sub-areas obtained by vertically dividing the screen of the liquid crystal display panel into a plurality of areas, and wherein the control means adjust the opening width of the opening in such a manner as to expose to the outside the respective sub-areas of the screen of the display unit in a stepped fashion in the state in which the opening is left open.  
           [0019]    An automotive display device as set forth in claim  2 , wherein the driving mechanism comprises; a gear provided rotatably around a predetermined stationary transverse shaft located at a position of the closing member which is away from the rotating shaft of the closing member, the motor for driving the gear to rotate via a gear mechanism, a first link member adapted to rotate around said stationary transverse shaft together with the gear a second link member having first and second arm portions extending from a bend portion in two directions in such a manner as to form an L-shape when viewed from a side and pivotally connected at a distal end portion of said first arm portion thereof to a free end of said first link member, a third link member pivotally connected at one end thereof to the portion of the second link member and at the other end to the position of the closing member which is away from the rotating shaft of the closing member, a first engagement portion provided at the bend portion of the second link member or the one end of the third link member;  
           [0020]    a second engagement portion provided at a distal end portion of the second arm portion of the second link member,  
           [0021]    a third engagement portion provided at either the one end or the other end of the third link member such that a distance from the first engagement portion thereto becomes longer than a distance between the first and second engagement portions, and a biasing means adapted to be brought into engagement with the first, second and third engagement portions so as to bias the first, second and third engagement portions such that the first, second and third engagement portions are arranged linearly, wherein the power of the motor is transmitted to the closing member via the gear mechanism, said gear, said first link member, the second link member and said third link member, whereby the closing member is closed and/or opened. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0022]    [0022]FIG. 1 is a partially cut-away side view of a main part of an automotive display device according to one embodiment of the invention;  
         [0023]    [0023]FIG. 2 is a plan view of FIG. 1;  
         [0024]    [0024]FIG. 3 is a front view of a center module in which the automotive display device shown in FIG. 1 is installed;  
         [0025]    [0025]FIG. 4 is a partially enlarged view of FIG. 1;  
         [0026]    [0026]FIG. 5 is a diagram showing a first link member;  
         [0027]    [0027]FIG. 6 is a diagram showing a second link member;  
         [0028]    [0028]FIG. 7 is a diagram showing a third link member;  
         [0029]    [0029]FIG. 8 is a diagram showing a spring member;  
         [0030]    [0030]FIG. 9 is a diagram showing a state in which a closing member shown in FIG. 1 is fully opened;  
         [0031]    [0031]FIG. 10 is a diagram showing a state in which the closing member shown in FIG. 3 is fully opened;  
         [0032]    [0032]FIG. 11 is a diagram showing a state in which the closing member shown in FIG. 3 is fully closed;  
         [0033]    [0033]FIG. 12 is a block diagram of the automotive display device shown in FIG. 1;  
         [0034]    [0034]FIG. 13 is a typical view showing the construction of a display unit;  
         [0035]    [0035]FIG. 14 is a diagram showing a state in which a small-sized display unit is installed in the display unit shown in FIG. 1;  
         [0036]    [0036]FIG. 15 is a block diagram of a first modified example of the display device shown in FIG. 1; and  
         [0037]    [0037]FIG. 16 is a block diagram of a second modified example of the display device shown in FIG. 1.  
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0038]    Now, a description will be given in more detail of preferred embodiments of the invention with reference to the accompanying drawings.  
         [0039]    [0039]FIG. 1 is a partially cut away side view of a main portion of an automotive vehicle display device according to one embodiment of the invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a front view of a center module in which the automotive display device of FIG. 1 is installed.  
         [0040]    As shown in FIG. 3, this display device  1  is incorporated into the center module  3  which is installed in a dashboard central portion of an automotive vehicle. Namely, the center module  3  in this embodiment corresponds to a dashboard portion of the invention. Provided in an upper portion of the center module  3  is an accommodating portion  5  in which the display device  1  is incorporated and accommodated. Note that reference numerals  7  and  9  in FIG. 3 denotes an equipment accommodating portion for accommodating therein on-board equipment such as a car audio component and central outlets for an air conditioner, respectively.  
         [0041]    As shown in FIG. 1, the display device  1  comprises a display unit (display)  13  installed in the accommodating portion  5  with a screen  11  facing front seats, a movable closing member  15  for closing and/or opening an opening in the accommodating portion  5 , a driving mechanism  17  for driving the closing member  15  to be closed and/or opened, a control portion (control means)  19  (refer to FIG. 13) for controlling the driving of said driving mechanism  17 , and a central control portion  21  (refer to FIG. 13). Note that this central control portion  21  may be omitted.  
         [0042]    As shown in FIGS. 1 and 2, the closing member  15  comprises a frame member  23  and a hood member  25 . The frame member  23  is rotatably pin connected at distal end portions of left and right supporting arms  23   a  thereof to supporting members  27  provided on the center module  3  with pins  29 , so that the frame member  23  is supported vertically rotatably around the pins  29  functioning as rotating shafts. The hood member  25  is substantially a plate-like member which is fixed to the frame member  23  and opens and/or closes the opening of the accommodating portion  5  as the frame member  23  rotates around the pins  29 .  
         [0043]    AS shown in FIGS. 1 and 2, the driving mechanism  17  comprises a motor  31 , a gear  33 , a reduction gear mechanism  35  for transmitting the rotating power of the motor  31  to the gear  33 , and a link mechanism  37  for driving the closing member  15  to be closed and/or opened based on the rotating power of the gear  33 . The motor  31 , the gear  33  and the gear mechanism  35  are supported by a supporting member  38  provided on the center module  3 . Note that in FIG. 2, as a matter of convenience, a warm gear  39  for the motor  31  and the gear mechanism  38 , which will be described later on, is omitted.  
         [0044]    A pulse motor with a rotary encoder is used as the motor and outputs a pulse signal as said motor rotates.  
         [0045]    The gear mechanism  35  comprises the warm gear  39  mounted on a rotating shaft of the motor and a transmission gear  41  for transmitting the rotation of the warm gear  39  to the gear  33 . The transmission gear  41  comprises a large-diameter gear portion  41   a  and a small-diameter gear portion  41   b  such that the large-diameter gear portion  41   a  mesh engages with the warm gear  39 , while the small-diameter gear portion  41   b  mesh engages with the gear  33 .  
         [0046]    The gear  33  is supported on the supporting member  38  in such a manner as to rotate around a transverse shaft and is designed to rotate around the transverse shaft when the rotating power of the motor  31  is given thereto via the gear mechanism  35 .  
         [0047]    As shown in FIG. 4, the link mechanism  37  comprises first to third pairs of link members  43 ,  45 ,  47  which are each provided on left and right and a pair of left and right spring members (biasing means)  49 . Note that as to the second pair of link members  45 , the left and right link members  45  are integrally connected by a connecting portion  51  (refer to FIG. 2).  
         [0048]    As shown in FIGS. 2, 4 and  5 , the first link member  43  is formed substantially into a rod-like shape, and a mounting portion  43   b  to a shaft  33   a  of the gear  33  which rotates together with the gear  33  is provided on one end portion (distal end portion)  43   a  of the link member  43  and a hole  43   d  for connecting to the second link member  45  is formed in the other end portion (free end portion)  43   c  thereof. Then, when the mounting portion  43   b  is mounted on the shaft  33   a , the link member  43  is designed to rotate together with the gear  33  around the transverse shaft.  
         [0049]    As shown in FIGS. 2, 4 and  6 , the second link member  45  has first and second arm portions  45   b ,  45   c  extending from a bend portion  45   a  in two directions in such a manner as to form an L-shape as viewed from a side. A hole  45   d  is formed in the bend portion  45   a  for connecting to the third link member  47 , a hole  45   e  for connecting to the first link member  43  is formed in a distal end portion of the first arm portion  45   b , and an engagement projection (second engagement portion)  45   f  is provided at a distal end portion of the second arm portion  45   c  in such a manner as to project inwards along a direction of the rotating axis of the closing member  15 .  
         [0050]    As shown in FIGS. 2, 4 and  7 , the third link member  47  is formed substantially into a rod-like shape. A hole  47   b  is formed in one end portion  47   a  of the third link member  47  for connecting to the second link member  45  and a hole  47   d  for connecting to the frame member  23  of the closing member  15  is formed in the other end portion thereof. In addition, formed in and provided at an intermediate portion of the link member is, respectively, an elongate hole  47   e  having a slightly elongate shape in a direction normal to a longitudinal direction of the link member  47  and an engagement projection (third engagement portion )  47   f  which projects inwards along a direction of the rotating axis of the closing member  15 .  
         [0051]    Here, the elongate hole  47   e  and the engagement projection  47   f  are, respectively, formed and provided on a straight line connecting the holes  47   b ,  47   d  formed in the end portions of the third link member  47 . The elongate hole  47   e  is formed in a position where the engagement projection  45  of the second link member  45  is loosely inserted when the hole  47   b  in the end portion  47   a  is connected to the hole  45   d  in the second link member  45  with a pin  55 . The engagement portion  47   f  is provided at a position where a distance from the hole  47   d  thereto becomes longer than a distance from the hole  47   d  to the elongate hole  47   e.    
         [0052]    The spring member  49  is a helical spring in which arm portions  49   a ,  49   b  at ends thereof projects like a rod from a wound portion  49   c  which is wound helically.  
         [0053]    The connection of the first link members  43  with the second link members  45  is effected by inserting pins  53  into the holes  43   d ,  45   e , whereby the two link members  43 ,  45  are connected with each other rotatably around the pins  53  acting as a transverse shaft. Note that in this embodiment the two link members are connected with each other such that the second link members  45  are positioned outwards of the first link members  43 .  
         [0054]    The connection of the second link members  45  with the third link members  47  is effected by inserting the pin  55  in the holes  45   d ,  47   d , whereby the two link members  45 ,  47  are connected with each other rotatably around the pin  55  acting as a transverse shaft. In this connected state, the second link members  45  are positioned outwards of the third link members  47 , and the engagement projections  45   f  of the second link members  45  project inwards of the third link members  47  via the elongate holes  47   e  in the third link members  47 .  
         [0055]    The connection of the third link members  47  with the frame member  23  of the closing member  15  is effected by inserting a pin  57  in holes, not shown, in left and right connecting portions  23   b  of the frame member  23  and the holes  47   d  in the link members  47 , whereby the third link members  47  are connected to the connecting portions  23   b  rotatably around the pin  57  acting as a transverse shaft. Note that the connecting portion  23   b  is provided at a position which is located away from a position where the frame member  23  is rotatably supported by the pin  29  (the distal end portion of the supporting arm  23   a ).  
         [0056]    The mounting of the spring member  49  is performed as below. With the pin  55  being inserted in the wound portion  49   c  of the spring member  49 , the two arm portions  49   a ,  49   b  which extend like a rod are crossed as shown by an arrow A in FIG. 8, so that the two arm portions  49   a ,  49   b  are brought into engagement with the two engagement projections  45   f ,  47   f  in such a manner as to hold the two engagement projections  45   f ,  47   f  between the two arm portions  49   a ,  49   b , whereby the engagement projection  45   f  is biased by the two arm portions  49   a ,  49   b  of the spring member  49  so as to be positioned on a straight line connecting the pin  55  with the engagement projection  47   f . Note that in this embodiment, the pin  55  corresponds to a first engagement portion according to the invention.  
         [0057]    In this construction, when the motor  31  is driven to rotate, the rotating power of the motor  31  is transmitted to the gear  33  via the gear mechanism  35 , and as the gear  33  rotates, the first link members  43  are driven to rotate within a predetermined rotating angle range. As this occurs, the rotating power of the link members  43  is then transmitted to the closing member  15  via the second and third link members  45 ,  47 , and as the link members  43  rotationally move, the closing member  15  rotate around the pins  29 , whereby the opening in the accommodating portion  5  is closed and/or opened.  
         [0058]    Here, FIGS. 1, 2 and  3  show a state in which the closing member  15  is opened such that the opening width of the opening in the accommodating portion  5  becomes half a maximum opening width resulting when the closing member is fully opened, FIGS. 9 and 10 show a state in which the closing member is opened such that the opening in the accommodating portion  5  is fully opened, and FIG. 11 shows a state in which the opening in the accommodating portion  5  is fully closed with the closing member  15 .  
         [0059]    When the closing member  15  is opened and/or closed as described above, in a normal state in which an excessive load is not applied to the closing member  15 , the power from the gear  33  is transmitted to the closing member  15  via the link mechanism  37  with the second arm portion  45   c  of the second link member  45  overlapping with the third link member  47  linearly (that is, in a state in which the pin  55  and the engagement projections  45   f  and  47   f  are aligned with one another linearly).  
         [0060]    On the contrary, in the event that an excessive load is applied to the closing member  15  or the like when it is opened or closed, the second arm portion  45   c  of the second link member  45  and the third link member  47  rotate relative to each other such that the pin  55  and the engagement projections  45   f  and  47   f  are arranged in substantially a “V” shape against the biasing force of the springs  49 , whereby the excessive torque is designed to be released.  
         [0061]    In addition, when the closing member  15  reaches a fully closed position and a fully opened position, a predetermined abutment portion, not shown, on the closing member  15  is constructed to be brought into abutment with a predetermined abutment portion, not shown, on the center module  3 , whereby the closing member  15  is prevented from rotating further in the closing and opening directions. Due to this, the looseness of the closing member  15  or the like resulting from a play can be prevented from occurring by constructing such that the closing member  15  is biased toward the closing and opening directions using the biasing force of the spring members  49  when the closing member  15  is fully closed and opened.  
         [0062]    [0062]FIG. 12 is a block diagram of the automotive display device according to the embodiment of the invention. Responding to an opening or closing command given by a central control unit  21 , a control unit  19  detects a pulse output outputted from the motor  31  and controls the driving of the motor  31  via a motor driving circuit  69  to thereby open and/or close the closing member  15 , whereby the opening width of the opening in the accommodating portion  5  is adjusted when the closing member  15  is opened. Note that while the control unit  19  is constructed to open and/or close the closing member  15  in response to an opening or closing command outputted by the central control unit  21  in response in turn to an operation input directing to open or close the closing member  15 , the control unit  19  may be constructed to directly respond to an operation input so as to open or close the closing member  15  without providing the central control unit  21 .  
         [0063]    To be more specific, with the closing member  15  being closed, when the central control unit  21  receives an operation input which directs to open the closing member  15 , the central control unit  21  outputs a command to open the closing member  15  to the control unit  19 . As this occurs, an opening width of the opening in the accommodating portion  5  which corresponds to the operation input is also adjusted by the control unit  19 .  
         [0064]    Responding to the command from the central control unit  21 , while counting pulses given by the motor  31 , the control unit  19  drives the motor  31  via the motor driving circuit  69  until the number of pulses so counted reaches a value corresponding to a designated opening width, whereby the closing member  15  is driven to be opened from the fully closed position to an open position corresponding to the designated opening width. As this occurs, the number of pulses counted is retained by the control unit  19  until the closing member  15  returns to the fully closed position again and is reset when the control unit  19  detects the return of the closing member  15  to the fully closed position.  
         [0065]    In addition, when the closing member  15  is fully opened, while counting pulses given by the motor  31 , the control unit  19  drives the motor  31  via the motor driving circuit  69  until the closing member reaches the fully opened position. As this occurs, that the closing member  15  has reached the fully opened position is detected by detecting that the opening operation of the closing member  15  has been stopped at the fully opened position, that even if driving pulses for driving the motor  31  are outputted further, there is no pulse outputted from the motor and hence the revolution of the motor  31  is at a halt.  
         [0066]    On the other hand, with the closing member  15  being opened at a predetermined open position, when the central control unit  21  receives an operation input directing to close the closing member  15 , the central control portion  21  outputs to the control unit  19  a command to close the closing member  15 .  
         [0067]    Responding to the command from the central control unit  21 , while counting pulses given by the motor  31 , the control unit  19  drives the motor  31  via the motor driving circuit  69  until the closing member  15  reaches the fully closed position. As this occurs, that the closing member  15  has reached the fully closed position is detected by detecting that the closing operation of the closing member  15  has been stopped at the fully closed position, that even if driving pulses for driving the motor  31  are outputted further, there is no pulse outputted from the motor and hence the revolution of the motor  31  is at a halt.  
         [0068]    In addition, when the closing member  15  is positioned at a position other than the fully closed position, the fully opened position or the designated open position, in the event that there is no pulse outputted from the motor  31  while being driven and hence the stop of revolution of the motor  31  is detected, the driving of the motor is stopped based on an understanding that something abnormal is happening in the driving mechanism  17  such as the failure of the driving mechanism  17  or the trapping of a foreign matter therein.  
         [0069]    The display unit  13  comprises a rectangular liquid crystal display panel (for example, a dot-matrix display type liquid crystal display panel)  61 , a light source unit  63  disposed on a back side of the liquid crystal display panel  61  and a control unit  65  for controlling the liquid crystal display panel  61  and the light source unit  63 . These liquid crystal display panel  61 , the light source unit  63  and the control unit  65  are accommodated in a casing  67 . The screen  11  of the liquid crystal display panel  61  is divided vertically into a plurality of sub-areas (here, into two halves) at a position indicated by a chain double-dashed line in FIG. 13. Note that for the display unit  13  according to the embodiment a large-sized display unit is adopted which can display television images and car navigation images.  
         [0070]    To deal with the construction of the display unit described above, the light source unit  63  comprises two sets of backlights  72 ,  73  for illuminating an upper portion area  11   a  and a lower portion area  11   b  of the screen  11 , respectively. The respective sets of backlights  72 ,  73  are controlled by the control unit  65  such that the backlights  72 ,  73  are turned on and/or off independently of each other. While the backlights are constituted by fluorescent lamps, incandescent lamps or LED, a surface luminescent EL device may be used for illuminating respective sub-areas  11   a ,  11   b  in a planar fashion to thereby reduce scattering in quantity of light.  
         [0071]    In addition, to deal with the above construction, according to the embodiment of the invention, the opening width of the accommodating portion  5  is constructed to change in a stepped fashion in accordance with the number of sub-areas resulting by the division of the screen  11  of the display unit  13 . That is, in the embodiment, the closing member  15  is constructed to be closed in a stepped fashion (in two steps) between the fully closed position shown in FIG. 11, an intermediately opened position as shown in FIGS. 2 and 3 in which only the lower sub-area  11   b  of the screen  11  of the display unit  13  is exposed to the outside, and the fully opened position in which the whole of the screen  11  is exposed to the outside.  
         [0072]    When outputting an opening command to the control unit  19 , the central control unit  21  outputs to the display unit  13  a command designating a display area on the screen which corresponds to the opening width of the opening. Responding to the command, the control unit  65  turns on the backlights  72 ,  73  of the light source unit  63  corresponding to the designated display area, whereby an image is displayed using the sub-areas  11   a ,  11   b of the screen  11  of the liquid crystal display panel  61 .  
         [0073]    Here, in a case where a car navigation image is displayed, the whole of the screen  11  of the display unit  13  is exposed to the outside from the opening in the accommodating  5 , the whole of the screen  11  of the display unit  13  is used for displaying a required image. In addition, in a case where only simple information is displayed such as information on the operation of on-board equipment or information constituted by simple and easy characters or symbols, a narrow display area is sufficient for the purpose, only the lower sub-area  11   b  may be exposed to the outside from the opening in the accommodating portion so that only the lower sub-area  11   b  is used for the display.  
         [0074]    Additionally, in the embodiment, while the large-sized display unit is used for the display unit  13  which can display the car navigation information, as shown in FIG. 14, in a case where a small-sized display unit  71  is used to display information on the operation on the on-board equipment or information constituted by simple and easy characters and symbols, the opening width when the closing member  15  is opened can be adjusted to the size of the screen  11  of the display unit  71 .  
         [0075]    As has been described heretofore, according to the embodiment of the invention, since the display unit  13  is installed in the accommodating portion  15  provided in the center module  3  and the display unit  13  is designed to emerge or submerge by opening or closing the opening in the accommodating portion with the closing member  15 , the display unit  13  therefore being not constructed so as be movable as in the case with the conventional display unit, even if there are provided touch switches on the display unit  13 , the supporting construction of the display unit  13  can be prevented from being affected by a load that would be generated when operating the touch switches.  
         [0076]    Additionally, since the conventional construction is not adopted in which the display unit  13  is pulled downwards so as to be accommodated into the dashboard portion (the center module  3 ), the display device  1  according to the embodiment of the invention can be installed even on an automotive vehicle which has less space in the interior of the dashboard portion.  
         [0077]    Furthermore, since the opening width of the opening can be adjusted to the size of the display unit, there is no need to replace supporting units for display units every time a display unit of a different size is used, thereby making it possible to reduce the number of components used.  
         [0078]    In addition, since the opening width of the opening in the accommodating portion  5  is adjusted to the vertical width of a display area on the screen  11  of the display unit  13  which is actually used for required display, in a case where a simple display of information such as one on the operation of on-board equipment is sufficiently implemented on the narrow display area, the required display can be effected by allowing only a portion on the screen  11  of the display unit  13  which is sufficient for the display can be exposed to the driver or the like to thereby reduce the burden visually applied to the driver or the like.  
         [0079]    Furthermore, since the motor with an encoder is used for the motor  31  for the driving mechanism  17 , the opening width of the opening in the accommodating portion  5  can be set accurately to any size based on an pulse output outputted from the motor  31 .  
         [0080]    Additionally, since the opening width of the opening can be adjusted to the vertical width of the display area of the display unit  13  where a display actually takes place in the state in which the opening in the accommodating portion  5  is opened, the opening width of the accommodating portion  5  can automatically be set to an appropriate size according to the vertical width of the display area of the display unit  13 .  
         [0081]    Furthermore, only the backlights  72 ,  73  corresponding to the portions of the screen  11  of the display unit  13  which are exposed to the outside to implement required display are automatically turned on, while the backlights  72 ,  73  corresponding to the portions on the screen  11  which are not required for the display are constructed so as to be automatically turned off, thereby making it possible to save the consumption of electric power.  
         [0082]    Additionally, as has been described above, in the event that excessive torque is applied to the first to third embodiments when the closing member  15  is opened and/or closed by virtue of the operation of the link mechanism  37  having the spring members  29 , the excessive torque can be released, and when the closing member  15  is located at the fully opened position or the fully closed position, the looseness of the closing member  15  can be prevented from by making use of the biasing force of the spring members  49 .  
         [0083]    Modified Example  
         [0084]    [0084]FIG. 15 is a block diagram of a first modified example of the display device  1  according to the embodiment of the invention. In this modified example, there are provided limit switches  81 ,  83  for detecting closed and/or opened angular positions of the closing member  15  (here, for detecting a fully closed position and a fully opened position). Then, while detecting the rotating angular position (here, for detecting a fully closed position and a fully opened position) of the closing member  15  based on detection outputs from the limit switches  81 ,  83 , the control unit  19  adjusts the opened position of the closing member  15  (here, the closing member  15  is designed to alternatively be opened and/or closed between the fully opened position and the fully closed position). Due to this, there is no need to provide the motor  31  with an encoder in this modified example.  
         [0085]    While the light source unit  63  in which the backlights  72 ,  73  can be selectively turned on and off is provided on the back of the display unit  13  in the aforesaid embodiment, in another modified example, in a case where a liquid crystal display panel  61  used is of a dot-matrix type such as using a TFT system, a light source unit may be provided on the display unit  13  which is adapted to be illuminated at all times on the whole surface thereof to illuminate the whole surface of a screen  11  when the light source unit is turned on for implementing display. In this case, when display is implemented, an area on the screen  11  which is covered with the closing member  15  and in which no display is implemented is displayed black.  
         [0086]    In addition, while the liquid crystal display unit is used for the display unit  13  in the aforesaid embodiment, an EL display unit (for example, an organic EL display unit) may be used as the display unit  13 .  
         [0087]    According to the first to sixth aspect of the invention, since the display unit is installed in the accommodating portion provided in the dashboard portion and the display unit is constructed to emerge or submerge by opening or closing the opening of the accommodating portion with the closing member, the display unit being not constructed so as to be movable as in the case with the conventional display unit, even if touch switches are provided on the display unit, it is possible to prevent the supporting construction of the display unit from being affected by a load that would be generated when the touch switches are operated.  
         [0088]    Additionally, since the conventional construction is not adopted in which the display unit is pulled downwards so as to be accommodated into the dashboard portion, the display device according to the embodiment of the invention can be installed even on an automotive vehicle which has less space in the interior of the dashboard portion.  
         [0089]    According to the second aspect of the invention, since the opening width of the opening can be adjusted to the size of the display unit, there is no need to replace supporting units for display units every time a display unit of a different size is used, thereby making it possible to reduce the number of components used.  
         [0090]    In addition, since the opening width of the opening in the accommodating portion is adjusted to the vertical width of a display area on the screen of the display unit which is actually used for required display, in a case where a large-sized display unit is used which can display a car navigation screen, when a simple display of information such as one on the operation of on-board equipment is sufficiently implemented on the narrow display area, the required display can be effected by allowing only a portion on the screen of the display unit which is sufficient for the display can be exposed to the driver or the like to thereby reduce the burden visually applied to the driver or the like.  
         [0091]    According to the third aspect of the invention, since the motor an encoder is used for the motor for the driving mechanism, the opening width of the opening in the accommodating portion can be set accurately to any size based on an pulse output outputted from the motor.  
         [0092]    According to the fourth aspect of the invention, since the opening width of the opening can be adjusted to the vertical width of the display area of the display unit where a display actually takes place in the state in which the opening in the accommodating portion is opened, the opening width of the accommodating portion can automatically be set to an appropriate size according to the vertical width of the display area.  
         [0093]    According to the fifth aspect of the invention, only the backlights corresponding to the portions of the screen of the display unit which are exposed to the outside to implement required display are turned on, while the backlights corresponding to the portions on the screen which are not required for the display are constructed so as to be turned off, thereby making it possible to save the consumption of electric power.  
         [0094]    According to the sixth aspect of the invention, since the first link members are connected to the closing member via the second link members and the third link members while the first to third three engagement projections provided on the second link members and the third link members are biased with the biasing means so that the three engagement projections are aligned with one another linearly, in the event that the excessive torque is applied to the first to third link members or the like when the closing member is opened and/or closed, the second arm portions of the second link members and the third link members rotate relative to each other against the biasing force of the biasing means such that the link members are arranged in substantially the “V” shape, whereby the excessive torque can be released. Moreover, when the closing member is located at the fully closed position or the fully opened position, the looseness of the closing member can be prevented by making use of the biasing force of the biasing means.