JPH089277A - On-vehicle display device - Google Patents

Abstract

PURPOSE:To display the stable images and also to prevent occurrence of faults for an on-vehicle display device by projecting a liquid crystal display over the top part of a dashboard when a vehice is driven and then cooling the display by the air stream flowing in an air conditioning duct. CONSTITUTION:A liquid crystal display 16 is projected over a top part 50a of a dashboard 50. An air duct 70 included in the dashboard 50 is divided into a 1st duct 70a which supplies the cooling air to the display 16 and a 2nd duct 70b which sends the air to a blow-out port 18 respectively. Then the display 16 is projected over the dashboard 50 only as necessary to display the desired information. Meanwhile the display 16 is stored in the dashboard 50 when not in use. Furthermore the display 16 is cooled by the cooling air for air conditioning. Thus it is possible to prevent the faults of the display 16 that are caused by the heat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device for an automobile navigation system or a vehicle television system.

[0002]

2. Description of the Related Art In-vehicle television sets using a liquid crystal display have been installed in luxury cars and the like. A liquid crystal display is used to display images on the television device, and is generally placed below a center console or the like. In addition, a car navigation system is now partly mounted on a vehicle. This car navigation system normally displays an image showing the current position on the display for the television.

[0003]

As described above, the display is placed under the center console or the like.
When watching the television, the driver generally sees the image on the display when the vehicle is stopped, so there is no particular inconvenience even if the driver is placed under the center console or the like. However, when this display is used for the image display of the car navigation system, when the driver tries to confirm the current position while driving, it is necessary to drop the line of sight directed toward the front of the vehicle to the display of the center console. For this reason, not only is it difficult to see the image displayed on the display due to the large movement of the line of sight, but also the safety confirmation in the front is neglected, which is very dangerous.

Therefore, the inventor of the present invention has devised to place the display on the upper part of the dashboard so as to minimize the movement of the line of sight during driving and enable the navigation display to be visually recognized while confirming the front of the vehicle. did. But,
When a liquid crystal display is placed on the dashboard, it is expected that the liquid crystal display with low heat resistance (60 ° C for normal liquid crystal and 85 ° C for vehicle) will be heated by the sunlight passing through the front window, causing thermal breakdown. Was done.
Further, the liquid crystal display has a problem that it is difficult to see the image display during use when the liquid crystal display is placed at a position where it is affected by external solar radiation. That is, when the temperature of the liquid crystal display is changed by being heated by solar radiation from the outside, the characteristics of the liquid crystal are changed and the image quality is changed. Further, in a liquid crystal display, light is transmitted from the back side by a backlight system in order to obtain a bright image, so that a large amount of heat is generated by itself, and this heat synergizes with the above-mentioned solar heat to accelerate the change in image quality.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to mount an image on a vehicle above which a stable image can be stably displayed above the dashboard without causing a failure. The present invention is to provide a display device.

[0006]

In order to achieve the above object, the vehicle-mounted display device according to the first aspect of the present invention is, in the first aspect, an openable / closable lid body disposed on a top portion of a dashboard, and the lid body. A liquid crystal display located below and inside the dashboard, a driving means for opening the lid and pushing up the liquid crystal display, and a control means for controlling the driving means to push up the liquid crystal display when the vehicle is used to push the dashboard. It has a control means that protrudes from the top and stores the liquid crystal display in the dashboard when the vehicle is not used, and an air duct for introducing the airflow in the air conditioning duct to the liquid crystal display side. Characterize.

In a preferred embodiment, the vehicle-mounted display device of the present invention further includes a switching means for switching between a state in which the air duct can be introduced into the liquid crystal display side by the air duct and a state in which it cannot. It is characterized in that the control means switches the air flow to the liquid crystal display side by the switching means while the cooler is operating.

Further, in a second aspect of the vehicle-mounted display device of the present invention, a liquid crystal display that can be positioned on the dashboard and inside the dashboard, and an air flow in an air conditioning duct is introduced to the liquid crystal display side. An air duct for switching the air flow to the liquid crystal display side by the air duct, and a switching means for switching the air flow to a state where the air flow is not possible; And a control means for switching the introduction of the air flow to a state in which the air flow can be introduced.

[0009]

In the vehicle-mounted display device constructed as described above, the control means for controlling the driving means causes the liquid crystal display to protrude from the top of the dashboard when the vehicle is used. Therefore, the driver can visually recognize the image on the liquid crystal display located above the dashboard while checking the front of the vehicle. At this time, the airflow in the air conditioning duct is introduced through the air duct to cool the liquid crystal display. Therefore, thermal destruction of the liquid crystal display due to solar radiation can be prevented. Further, since the temperature of the liquid crystal display is stable, there is no change in image quality, and the image display is easy to see. Further, when the vehicle is not in use, the control means causes the driving means to house the liquid crystal display in the dashboard, and the lid body is positioned above the liquid crystal display, so that the lid body can be protected from strong sunlight passing through the front window. When exposed, heat does not transfer to the liquid crystal display located below the lid. For this reason, thermal destruction of the liquid crystal display due to solar radiation can be prevented even when the liquid crystal display is housed in the dashboard.

Further, in a preferred aspect of the present invention, the control means switches the airflow to the liquid crystal display side by the switching means only during the operation of the cooler. Therefore, the liquid crystal display can be cooled by the airflow cooled by the cooler.

Further, in the second aspect of the present invention, the control means switches the state in which the air flow can be introduced to the liquid crystal display side by the switching means only during the operation of the cooler, and through the air duct. The airflow cooled by the cooler is introduced to cool the liquid crystal display. Therefore, thermal destruction of the liquid crystal display due to solar radiation can be prevented. Further, since the temperature of the liquid crystal display is stable, there is no change in image quality, and the image display is easy to see.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a dashboard in which an in-vehicle display device according to an embodiment of the present invention is arranged. This on-vehicle display device operates as a display of a car navigation system and can also be used as a display of an on-vehicle television device. In this embodiment, as shown in FIG. 1, the liquid crystal display 16 is configured to protrude from the top portion 50a of the dashboard 50. A heat shield lid 12 made of a heat insulating resin is disposed above the liquid crystal display 16, and a light shield side wall 14 attached to the lid 12 is disposed laterally. That is, the lid 12 acts to shield the liquid crystal display 16 from heat, and the end portion 12a on the liquid crystal display side extends beyond the liquid crystal display 16 so that light from above can be applied to the surface of the liquid crystal display 16. It prevents the screen from being difficult to see due to the reflection. Similarly, the sidewalls 14 prevent lateral light from striking the surface of the liquid crystal display 16. An air conditioner outlet 18 is disposed below the liquid crystal display 16, and a center console 22 is attached below the outlet 18.

Next, the circuit configuration of the vehicle-mounted display device of the present invention will be described with reference to FIG. The vehicle-mounted display device includes a navigation circuit 40 for obtaining the current position of the vehicle and displaying it on a map, a television circuit 45 for receiving a television, a pop-up operation and a cooling operation of a liquid crystal display 16 which will be described later. It mainly consists of a control circuit 30 for performing. This control circuit 30
It consists of a one-chip program IC, and has an a terminal connected to the ignition switch on the input side and a normally open switch for setting the liquid crystal display 16 to be open while the ignition is on.
It has a terminal, a c terminal connected to a storage switch for closing the liquid crystal display 16 in an arbitrary state, and a d terminal connected to a display appearance switch for causing the liquid crystal display 16 to appear. Further, as inputs, an h terminal connected to a switch of an air conditioner (hereinafter referred to as an air conditioner), an i terminal connected to a starter switch of the cooler, and a j terminal connected to an individual cooling switch described later, The liquid crystal display 16 is provided with a k terminal connected to a temperature adjustment switch for setting ON / OFF of automatic temperature adjustment, and further, ON / OFF signals from the navigation circuit 40 and the television circuit 45 are input. E terminal and the navigation circuit 40
Also, an f terminal to which a video signal from the television circuit 45 is input and a g terminal connected to the temperature sensor 20 attached to the liquid crystal display 16 are provided. On the other hand,
On the output side, the x terminal connected to the first relay 32 for controlling the electric power to the motor M1 that pops up the liquid crystal display 16 and the electric power to the motors M2 and M3 that perform the cooling operation described later are controlled. It has y and z terminals connected to the second and third relays 34 and 36, respectively.

The pop-up mechanism of the vehicle-mounted display device of this embodiment will be described with reference to FIG. FIG. 3 is a partially cutaway sectional view of the dashboard 50 shown in FIG. 1, and FIG.
6 is stored in the dashboard 50,
In FIG. 3B, the liquid crystal display 16 has a dashboard 5
It shows a state of being projected from 0. As shown in FIG. 3A, when the liquid crystal display 16 is housed in the dashboard 50, the lid 12 is closed so that the surface of the lid 12 and the surface of the dashboard 50 become flat. Is configured. The lid 12 is a plate-shaped member made of a heat insulating resin. A support piece 58 for supporting the upper part of the liquid crystal display 16 is erected on the lower surface of the lid body 12, and a pin 56 attached to one end of the liquid crystal display 16 has a through hole 58a of the support piece.
Has been inserted into. A sliding member 62 fixed to the dashboard 50 side by a member (not shown) is arranged beside the liquid crystal display 16, and the other end of the liquid crystal display 16 is fitted into a sliding hole 62a of the sliding member 62. The pin 60 attached to the part is inserted.

Side walls 14 for light shielding of the liquid crystal display are attached to the sides of the lid 12 (front side and rear side in FIG. 3) (note that the side wall 14 is on the rear side for convenience of illustration). Note that it is shown only). And
A driven gear 54 pivotally supported by a shaft 64 fixed to the dashboard 50 side is attached to an end portion of the lid body 12 on the left side in the drawing. The driven gear 54 is arranged so as to mesh with the drive gear 52 on the motor M1 side.

The motor M1 includes a first relay 32 shown in FIG.
The drive gear 52 is rotated in the clockwise direction by the electric potential from to drive the lid 12 counterclockwise around the shaft 64 to open it, and at this time, the support piece 58 of the lid 12 is opened. The liquid crystal display 16 is pulled up through the pin 56 supported by the. At this time, the other pin 60 of the liquid crystal display 16 slides in the sliding hole 62a of the sliding member 62 to the right in the figure. The motor M1 is stopped by the action of a limit switch (not shown) while the liquid crystal display 16 shown in FIG. 3 (B) is completely pushed up, and this state is maintained.

On the other hand, the motor M1 is reversely rotated by the reverse potential applied from the first relay 32 to rotate the drive gear 52 counterclockwise to drive the lid body 12 clockwise around the shaft 64. Then, the liquid crystal display 16 is pushed downward. The motor M1 is stopped by the action of a limit switch (not shown) while the lid 12 shown in FIG. 3 (A) is completely closed, and maintains this state.

Next, a mechanism for cooling the liquid crystal display 16 will be described with reference to FIG. 4 is shown in FIG.
Air duct 70 located in the dashboard 50 of
The cross section of FIG. The air duct 70 includes a first duct 70a for sending cool air to the liquid crystal display 16 side,
It is bifurcated with a second duct 70b for blowing air to the outlet 18 side. At the branch position between the air duct 70 and the first duct 70a, cool air is introduced into the first duct 70a.
The 1st switching plate 72 for sending to the side is arrange | positioned. Further, a second switching plate 74 for sending the cool air to the second duct 70b side is arranged at a branch position between the air duct 70 and the second duct 70b. The first switching plate 72 is driven by the above-described motor M2 (see FIG. 2), allows air to be blown to the liquid crystal display 16 side in the open state shown by the solid line in the figure, and conversely in the closed state shown by the dotted line. Prevents air from flowing into the liquid crystal display 16. Further, the second switching plate 74 is driven by the motor M3 described above, and in the open state shown by the solid line in the figure, the outlet 1 is opened.
Blow to the 8 side is allowed, and on the contrary, in the closed state shown by the dotted line, cool air is prevented from being blown out from the blowout port 18.
(Note that the opening / closing mechanism of the first and second switching plates 72, 74 is substantially the same as the opening / closing mechanism of the lid 12 described above with reference to FIG. 3, so illustration and description thereof will be omitted).

Next, a remote control device for the navigation circuit 40 will be described with reference to FIG. FIG. 5 shows a plan view of the remote control device 80. The remote control device 80 enables the driver to easily operate the navigation system while driving, and also allows an occupant sitting in the passenger seat or the rear seat to switch the navigation system. An on / off switch 80a for the circuit 40, a scroll switch 80b for scrolling the map created by the navigation circuit 40 up and down, left and right, and a function switch 80c for switching various functions are provided, and the above switches are pressed. And an infrared signal is transmitted to a light receiver 42 (see FIG. 2) of the navigation circuit 40 attached to the dashboard 50 side. The on / off switch 80a operates to operate the navigation circuit 40 when pressed once, and stops the navigation circuit 40 when pressed again.

Now, the control operation of the control circuit 30 shown in FIG. 2 will be described with reference to the flow charts of FIGS. FIG. 6 shows the main routine of the control circuit 30. The control circuit 30 constantly monitors whether or not the ignition is turned on by the input from the terminal a (S6).
1). Then, when the ignition is turned on (S61
Yes), a pop-up routine described later is started (S62), and a cooling routine is further started (S6).
3). After that, it is determined whether the ignition is turned off (S64). While the ignition is not turned off (No in S64), the pop-up routine (S6) is performed.
2) and the activation of the cooling routine (S63) are repeated at a predetermined cycle. Then, when the ignition is turned off (Yes in S64), this main routine is once ended, and the monitoring whether or not the ignition is turned on is started again (S61).

Next, step 62 of the main routine described above.
The pop-up routine that is started in step 2 will be described in detail with reference to the flowchart in FIG. First, the control circuit 30 determines whether or not the operator has set the normally open switch to open the liquid crystal display 16 while the ignition is ON, based on the input from the terminal b shown in FIG. 2 ( S101). Here, the normally open switch is ON
If yes (Yes in S101), step 1
Proceed to 04 and immediately open the liquid crystal display 16. That is, after it is determined that the ignition is ON in step 61 of the main routine described above, a positive potential is applied to the motor M1 by the first relay 32 shown in FIG. 2, and the motor M1 is started to start the motor M1. ), The lid 12 is opened counterclockwise, and the liquid crystal display 16 is projected from the dashboard 50.

On the other hand, when the normally open switch is not turned on (No in S101), the process proceeds to step 102, and it is determined whether the navigation circuit 40 is turned on or not by checking the signal from the navigation circuit 40 from the e terminal. It is judged by inputting (S102). For example, when the on / off switch 80a of the remote control device 80 described above with reference to FIG. 5 is pressed, a signal is sent to the photodetector 42 side shown in FIG. 2, and the navigation circuit detects this through the photodetector 42. 40 starts operation and outputs a signal to the e terminal side of the control circuit 30. In response to this, the determination in step 102 as to whether the navigation circuit is ON becomes Yes, and the process proceeds to step 104, and the liquid crystal display 16
open. If the navigation circuit 40 is not turned on (No in S102), it is further determined whether the display appearance switch for causing the liquid crystal display 16 to appear is turned on (S103). Then, the display appearance switch is turned on (Yes in S103).
s), the liquid crystal display 16 is opened (S104). On the other hand, when the display appearance switch is not turned on (No in S103), the process proceeds to step 105.

In step 105, the control circuit 30
Determines whether or not the storage switch is turned on by inputting from the c terminal. Here, when the storage switch is turned on (Yes in S105), the liquid crystal display 16
Is closed (S109). That is, the control circuit 30 applies a reverse potential to the motor M1 by the first relay 32 shown in FIG. 2, starts the motor M1 and closes the lid body 12 clockwise as shown in FIG. 3 (A). The liquid crystal display 16 is housed in the dashboard 50. On the other hand, unless the storage switch is turned on (No in S105), step 106
Then, it is determined whether the operation of the navigation circuit 40 has stopped or not. For example, when the navigation circuit 40 is turned off by the on / off switch 80a of the remote control device 80 described above (Yes in S106).
s), the liquid crystal display 16 is closed (S109). Then, unless the navigation circuit 40 is turned off (No in 106), it is determined whether or not there is a video input within a fixed time (S107). That is, the control circuit
Navigation circuit 40 and television circuit 4 via terminals
When the video signal applied to the liquid crystal display 16 from 5 is monitored, and there is no video input even after a fixed time elapses after this pop-up routine is started, in other words, when nothing is displayed on the liquid crystal display 16 ( Yes at 107), the liquid crystal display 16 is closed (S109). Further, if there is a video input before the elapse of a certain period of time, or before the elapse of the certain period of time (S107
No), it is determined whether the ignition is turned off (S108).

If the ignition is turned off (Yes in S108), the liquid crystal display 16 is immediately closed (S109). That is, when the ignition is turned off and the temperature of the interior of the vehicle becomes high because the driver's vehicle is separated from the vehicle, the liquid crystal display 16 is displayed on the dashboard 50.
Store inside to protect. In other words, as long as the ignition is turned on, there is a high probability that an occupant will be inside the vehicle, and there is almost no possibility of reaching a temperature high enough to destroy the liquid crystal display 16. When the ignition is not turned off (No in S108), the pop-up routine is once terminated and returns to the main routine described with reference to FIG.

As described above, in this embodiment, various switches are provided, and the liquid crystal display 16 can be set to be projected from the dashboard 50 only when necessary so that desired information can be displayed, and when it is unnecessary, the liquid crystal display 16 can be displayed. Since 16 is housed in the dashboard 50 so as not to obstruct the driving field of view, it is optimal for display in a car navigation system.

Next, the cooling routine in step 63 of the main routine of FIG. 6 will be described in detail with reference to the flowchart of FIG. First, the control circuit 30 indicates whether or not the air conditioner is switched on, as shown in FIG.
It is judged by the input from the terminal (S201). here,
If the air conditioner is switched on (S20
If the answer is 1 (Yes), it is further determined whether the air conditioner is in the cooling state, that is, whether the cooler is activated (S202). In the case of the cooling state (Yes in S202), it is then determined whether the liquid crystal display 16 is opened (whether it is projected on the dashboard 50) (S203). Here, when the liquid crystal display 16 is opened (Yes in S203)
s), that is, when the cooling is performed and the liquid crystal display 16 is open, the process proceeds to step 204. On the other hand, if any of the above steps 201 to 203 is No, for example, if the inside of the vehicle is being heated by the air conditioner, the process proceeds to step 212, it is determined whether the first switching plate 72 is opened, and the first switching plate 72 is opened. When the switching plate 72 is opened and warm air is flowing into the liquid crystal display 16 side (Yes in S212), the first switching plate 72 is closed (S2).
11). On the other hand, when the first switching plate 72 is closed (No in S212), all the processes in the cooling routine are finished without cooling the liquid crystal display 16 described later.

The control circuit 30 controls the step 203 described above.
When it is determined that the display is open in step S4, it is determined whether an individual cooling switch, which will be described later, is turned on (S).
204). Here, it is assumed that the individual cooling switch is not turned on (No in S204). Next, it is determined whether or not a temperature adjustment switch described later is turned off (S206). Here, it is assumed that the temperature adjustment switch is not turned off (No in S206). After that, the control circuit 30 inputs a signal from the temperature sensor 20 (see FIG. 2) attached to the liquid crystal display 16 from the g terminal, and determines whether or not the liquid crystal display 16 is below the set temperature (40 degrees). (S208). That is, it is not necessary to cool the liquid crystal display 16 when the liquid crystal display 16 is 40 degrees or less, and excessive cooling may change the characteristics of the liquid crystal display 16 and make the display unclear. Here, if the display is 40 degrees or more (S
Yes in 208), and proceeds to step 209.

In step 209, the control circuit 30
Applies a positive potential to the motor M2 by the first relay 34 shown in FIG. 2, starts the motor M2, and drives the first switching plate 7 as shown by the solid line in FIG.
Open two. As a result, the cool air sent from the cooler side through the air duct 70 is filled in the small chamber created by the lid 12, the liquid crystal display 16, and the side wall 14 to cool the liquid crystal display 16. And the control circuit 3
In 0, it is determined whether or not the temperature has been cooled to a set temperature (for example, 30 ° C.) or lower (S210). Here, if the liquid crystal display 16 is not cooled to the set temperature, step 210 becomes No and the system stands by in this state. And
When the liquid crystal display 16 is cooled to the set temperature (Yes in S210), the first switching plate 72 is closed (S21).
1), stop the introduction of cold air to the liquid crystal display 16,
All processing ends. Since the series of cooling routines described above is repeated each time step 63 of the main routine shown in FIG. 6 is started, cooling of the liquid crystal display 16 is repeatedly executed as long as the cooler is in the ON state.

Here, the process in the case where the operator desires to keep the liquid crystal display 16 continuously cooled and sets the temperature adjustment switch described above to OFF will be described with reference to FIG. When the cooling routine is started and cooling is performed and the liquid crystal display 16 is open, Steps 201 to 203 are all Yes, and after the determination in Step 204, it is determined whether or not the temperature adjustment switch is OFF. (S206). Here, the control circuit 30
The fact that the temperature adjustment switch is set to OFF is detected from the k terminal (Yes in S206), the first switching plate 72 is immediately opened (S207), and all processing is ended. That is, the cooling is continued regardless of the temperature of the liquid crystal display 16. After that, for example, by turning off the switch of the air conditioner (No in step 201), step 21
At 2, the control circuit 30 determines whether or not the first switching plate 72 is open. Here, since the first switching plate 72 is open,
When step 212 becomes Yes, the process proceeds to step 211 and the first switching plate 72 is closed.

Further, since the operator wants to cool the liquid crystal display 16 but does not want to cool the inside of the vehicle, the process when the individual cooling switch described above is set to ON will be described with reference to FIG. When the cooling routine is started and cooling is being performed and the liquid crystal display 16 is open, all of steps 201 to 203 are Yes.
Then, it is determined whether or not the individual cooling switch is turned on (S204). Here, the control circuit 30 detects ON of the individual cooling switch from the j terminal (Yes in S204).
s), the first switching plate 72 is opened and the second switching plate 74 is closed (S205). That is, the control circuit 30 applies a positive potential to the motor M2 by the second relay 34,
4 to open the first switching plate 72 as shown by the solid line in FIG. 4, and apply a reverse potential to M3 by the third relay 36 to start the motor M3 to activate the second switching plate 74. Close as indicated by the dotted line. Thereby, the cool air is filled into the small chamber created by the lid body 12, the liquid crystal display 16 and the side wall 14 without being blown out from the air outlet 18, and the liquid crystal display 16 is cooled.

After that, for example, the air conditioner switch is turned on.
By performing FF (No in step 201), in step 212, the control circuit 30 determines whether the first switching plate 72 is open. Here, since the first switching plate 72 is open, the step 212 is performed. Is Yes, Step 2
11, the first switching plate 72 is closed, and the second switching plate 72 is closed.
The switching plate is opened and the cooling routine ends.

As described above, according to this embodiment,
Since the cold air of the air conditioner is introduced to cool the liquid crystal display 16, the failure of the liquid crystal display 16 due to heat can be prevented. Furthermore, the liquid crystal display 16 placed on the dashboard 50 is heated by direct sunlight, and at the same time, a large amount of heat is generated because light is transmitted from the rear by a backlight system for the purpose of obtaining a bright image. Therefore, the characteristics of the liquid crystal are not stable and the image quality is likely to change. However, according to the present embodiment, the temperature of the liquid crystal display 16 is automatically kept constant, so that the stable image quality can be always provided.

In the above-described embodiment, the pop-up mechanism of the liquid crystal display 16 has the dashboard 5
Although it is arranged on the top portion 50a of 0, it is also possible to arrange this pop-up mechanism in the center console 22 shown in FIG. Further, although the liquid crystal display 16 is shared by the navigation circuit 40 and the television circuit 45 in the above-described embodiment, the pop-up type liquid crystal display 16 of this embodiment is dedicated to the navigation circuit 40 and the center console is used for the television circuit 45. It is also possible to arrange another display on the 22 side.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a vehicle-mounted display device according to an embodiment of the present invention is arranged.

FIG. 2 is a block diagram showing a circuit configuration of an in-vehicle display device according to an embodiment of the present invention.

3 is a partially cutaway sectional view of the vehicle-mounted display device of FIG.

4 is a cross-sectional view of the duct in the dashboard of FIG.

FIG. 5 is a plan view of the remote control device.

FIG. 6 is a flowchart showing a main routine of the vehicle-mounted display device of the embodiment.

FIG. 7 is a flowchart showing a pop-up routine of the vehicle-mounted display device of the embodiment.

FIG. 8 is a flowchart showing a cooling routine of the vehicle-mounted display device according to the embodiment.

[Explanation of symbols]

 12 lid 14 side wall 16 liquid crystal display 20 temperature sensor 30 control circuit 50 dashboard 70 air duct 70a first duct 72 first switching plate

Claims (3)

[Claims] 1. A lid body which is arranged on the top of a dashboard and which can be opened and closed, a liquid crystal display which is arranged below the lid body and inside the dashboard, and which opens the lid body and displays the liquid crystal display. A drive means for pushing up, a control means for controlling the drive means, pushing up the liquid crystal display when the vehicle is used to project from the top of the dashboard, and storing the liquid crystal display in the dashboard when the vehicle is not used; An in-vehicle display device comprising: an air duct for introducing an air flow in a conditioning duct to the liquid crystal display side. 2. A switching means for switching between a state in which an air flow can be introduced to the liquid crystal display side by the air duct and a state in which the air flow cannot be introduced, and the control means is arranged to operate the switching means while the cooler is operating. The vehicle-mounted display device according to claim 1, wherein the air flow is introduced into the liquid crystal display side by means of a switch. 3. A liquid crystal display positionable on and in the dashboard, an air duct for introducing an air flow in an air conditioning duct to the liquid crystal display side, and the liquid crystal display side by the air duct. A switching means for switching the air flow to the liquid crystal display side, and a control means for switching the air flow to the liquid crystal display side while the cooler is operating. An in-vehicle display device having.