JP2017039461A - Vehicle display and control method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set time for which a driver is allowed to view a display in response to a vehicle running state, and to call driver's attention to a vehicle travel direction to eventually enable safe running when time for which the driver views the display exceeds the allowable time.SOLUTION: A vehicle display comprises: display means 14 mounted in a vehicle and displaying information; line-of-sight recognition means 11 detecting a line of sight of a driver; running state detection means 12 detecting a running state from an actuation state of each part of the vehicle and a driving environment; risk determination means 131 estimating a running risk from a detection result of the running state detection means 12; and control means 13 controlling the display means 14 from a recognition result of the line-of-sight recognition means 11 and a determination result of the risk determination means 131, the vehicle display being configured such that the control means 13 changes a display state of the display means 14 when time for which the driver views the display means 14 exceeds a display view allowable time determined by the determination result of the risk determination unit 131.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle display device that is mounted on a vehicle and displays information or an operation panel, and a control method thereof.

  Vehicle display devices that use a known liquid crystal panel or the like that is mounted on a vehicle and displays an image on a display surface are widely used. A driver using such a display device for a vehicle is gazing at the front of the vehicle during normal driving, and looks at a map screen or the like displayed on the display device as necessary.

Conventionally, by using such a driver's behavior pattern, a line-of-sight recognition means for detecting the driver's line of sight is added to an on-board display device, and the driver can display the display device from the output state of the line-of-sight recognition means. It has been proposed to reduce the power consumption of the device by reducing the screen emission brightness of the display device when it is determined that the device is not visually observed.

JP 2010-012995 A JP 2011-137874 A JP 2013-225131 A

On the other hand, it is well known that if the driver keeps gazing at the display device while the vehicle is traveling, the attention to the traveling direction of the vehicle is distracted and a dangerous state is caused. Therefore, the display device for a vehicle and the control method thereof according to the present invention sets a time that allows the driver to visually observe the display device according to the traveling state of the vehicle, and when the allowable time is exceeded, An object is to alert the driver to the vehicle traveling direction by turning off the display device or the like and to enable safe driving as a result.

  According to the first aspect of the present invention, display means mounted on the vehicle for displaying information, line-of-sight recognition means for detecting the line-of-sight direction of the driver of the vehicle, operating states of each part of the vehicle, and driving environment A driving state detecting means for detecting the driving state of the vehicle from the above, a risk determining means for estimating the driving risk of the vehicle from the detection result of the driving state detecting means, a recognition result of the line-of-sight recognition means and the risk determination Control means for controlling the display means based on the judgment result of the means, and the control means is a visual display for which the time that the driver is viewing the display means is determined by the judgment result of the risk judgment means. A display device for a vehicle is provided that changes the display state of the display means when an allowable time is exceeded.

  According to the invention described in claim 2, the control means is configured to display the display visual permissible time determined by the determination result of the risk determination means when the time during which the driver is viewing the display means is exceeded. A control method for a vehicular display device, which acts as if it reduces the screen emission luminance of the display means.

According to the invention described in claim 3, the control unit is configured to perform the display when the time when the driver is viewing the display unit exceeds a display visual permissible time determined by a determination result of the risk determination unit. A control method for a vehicular display device, which acts as if to reduce the contrast of a display image of a display means.

According to the invention described in claim 4, the reduction of the screen light emission luminance or the reduction of the display contrast performed by the control unit on the display unit is performed by the driver in the driving environment of the vehicle. It is the control method of the display apparatus for vehicles characterized by it being the brightness | luminance of the lower limit which can visually recognize the display content of, or the contrast of a lower limit.

  According to the invention described in claim 5, the control means is configured such that the time when the driver is viewing the display means exceeds a display visual permissible time determined by a determination result of the risk determination means. A control method for a vehicular display device, characterized in that a warning message such as “Attention ahead” is displayed on the screen of the display means.

According to the invention described in claim 6, in addition to the invention of claim 1, it further comprises warning sound generating means for generating a warning sound, and the control means is a time during which the driver is viewing the display means. Is a vehicle display device that causes the warning sound generating means to generate a sound when the display visual permissible time determined by the determination result of the risk determining means is exceeded.

According to the seventh aspect of the present invention, in addition to the first aspect of the invention, the vehicle surrounding obstacle recognition means is provided, and the risk level judgment means is configured to detect the detection result of the traveling state detection means and the detection result. The vehicle display device is characterized in that a traveling risk of a vehicle is estimated from a detection result of a vehicle surrounding obstacle recognition means.

According to the invention described in claim 8, the risk determination means calculates a numerical risk based on the travel speed of the vehicle, or in addition to the travel speed, the steering angle of the vehicle, the wiper operation Condition, detection result of surrounding obstacle recognition means, lighting device operation state, direction indicator operation state, road surface freezing index estimated from outside air temperature, road form obtained from map information, driver information (age / driving experience) ) To calculate the degree of risk based on at least one piece of information.

  According to the ninth aspect of the present invention, in addition to the first aspect of the invention, the control means is a visual display that determines the time during which the driver is viewing the display means depending on the judgment result of the risk degree judging means. When the allowable time is exceeded, the display state of the display means is changed, and the engine output of the vehicle is limited or the brake device of the vehicle is operated so that the vehicle does not exceed the vehicle speed at which the vehicle is traveling at the time. This is a control method for a vehicle display device.

According to the invention described in claim 10, in addition to the invention of claim 9, the control means allows the driver to display the display by the line-of-sight recognition means during a period when the engine output of the vehicle is limited. When it is detected that the means is no longer visible, the control of the engine output is gently released, and this is a control method for a vehicle display device.

According to the invention described in claim 11, the control means displays the display means when the information displayed on the display means is driving support information such as an overhead view image or a back monitor image around the vehicle. A control method for a display device for a vehicle, wherein control for changing a state is prohibited.

  According to the first aspect of the present invention, when the vehicle is in a forward traveling state, the time when the driver is not observing the front and gazing at the display means mounted on the vehicle is determined according to the traveling risk of the vehicle. Since the display state of the display means changes when the allowable time is exceeded, it becomes possible to alert the driver. As a result, the driver stops gazing at the display means and returns the line of sight to the front, so that the driver can travel safely without delaying recognition of a front obstacle or the like.

  In addition, if the driver who continues to use the vehicle equipped with the vehicle display device of the present invention keeps gazing at the display means for a predetermined time or more, the display content of the display means changes and it becomes difficult to see. Since it is a habitual experience, it is customary not to look at the display means more than necessary, and it has an excellent effect of being able to acquire the habit of performing safe driving.

  According to the invention of claim 2, the screen emission brightness of the display means is reduced when the time during which the driver is viewing the display means exceeds the display visual permissible time determined by the judgment result of the risk judgment means. Since it is difficult to recognize the display contents of the display means, the driver can urge the user to return the line of sight to the traveling direction outside the vehicle.

  According to the invention of claim 3, the contrast of the display means is reduced when the time during which the driver is viewing the display means exceeds the display visual permissible time determined by the determination result of the risk determination means. Therefore, since it becomes difficult for the driver to recognize the display content of the display means, it is inevitably urged to return the line of sight to the traveling direction outside the vehicle.

  According to a fourth aspect of the present invention, the reduction of the screen light emission brightness or the reduction of the display contrast performed by the control unit on the display unit is performed by the driver in the driving environment of the vehicle. Therefore, the display means is completely turned off so that the driver does not misunderstand that the display device is malfunctioning.

According to the invention of claim 5, when the display visual permissible time is exceeded, a warning message such as “Warning ahead!” Or the like is displayed on the screen of the display means, so that a clearer warning is given to the driver. It becomes possible.

According to the invention of claim 6, since a warning sound such as a buzzer sound is emitted when the display visual permissible time is exceeded, it is possible to give a clearer alert to the driver.

  According to the invention of claim 7, in addition to the invention of claim 1, the danger determination in the vehicle traveling direction can be grasped more accurately because the danger degree judgment is performed using the vehicle peripheral obstacle recognition means together. Therefore, it is not necessary to set the display visual permissible time excessively short, and the time until the display content change of the display means relative to the actual degree of danger in the driving environment is for the driver to check the display content of the display means. Can be set in a reasonable time with a margin.

According to an eighth aspect of the present invention, in addition to the traveling speed of the vehicle, the risk determination means includes a steering angle, a wiper operating state, a detection result of a surrounding obstacle recognition means, an operating state of a lighting device, and an operation of a direction indicator. Since the risk level is calculated using at least one of the conditions, road surface freezing index estimated from outside air temperature, road form obtained from map information, and driver information (age / driving experience). A danger situation approaching the driving environment of the vehicle can be estimated, and the display visual permissible time determined from the degree of danger is appropriately set with respect to the driving situation of the vehicle.

According to the ninth aspect of the invention, in addition to the first aspect of the invention, the control means has a display visual permissible time determined by a judgment result of the risk degree judging means when the driver is viewing the display means. If exceeded, the vehicle engine output is limited or the vehicle brake device is activated to suppress further increase in vehicle speed, so the vehicle speed increases during the period when the driver is not looking in the direction of travel. Can be suppressed, and the possibility of a dangerous driving state can be reduced.

According to the invention of claim 10, since the engine output control is gently released when the engine output restriction is released from the state where the engine output of the vehicle is restricted, the driver can When the line of sight is returned to the front, it is possible to prevent the engine output from rapidly increasing and a dangerous driving state.

According to the invention of claim 11, when the information displayed on the display means is so-called driving support information such as an overhead image around the vehicle or a back monitor image, the display state of the display means Therefore, when the driver is performing a driving operation while paying attention to the back with a monitor camera, the screen display is not interrupted.

It is a block diagram for demonstrating the structure of the display apparatus for vehicles which concerns on one Embodiment of this invention. It is a block diagram for demonstrating the structure of the display apparatus for vehicles which concerns on another embodiment of this invention. It is a block diagram for demonstrating the structure of the display apparatus for vehicles which concerns on another embodiment of this invention. It is a figure showing the front view of the display apparatus for vehicles of the present invention. It is a figure which shows the example which changed the display state of the display apparatus. It is a figure showing night vision prevention processing in the control method of the display for vehicles of the present invention. It is a figure showing a gaze warning process in the control method of the display apparatus for vehicles of the present invention. It is a figure showing the calculation process of a danger in the control method of the display apparatus for vehicles of this invention. It is a figure showing the relationship between display visual tolerance time and a danger. It is a figure showing the process in case the warning information of a vehicle, or a periphery image is displayed. It is a figure showing the process which controls driving | running | working of a vehicle when the display visual permissible time is exceeded. It is a figure showing the structure of a gaze recognition means. It is a figure showing the structure of a vehicle periphery obstruction recognition means.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram for explaining the configuration of a vehicle display device according to an embodiment of the present invention, which includes a line-of-sight recognition means 11 for detecting a driver's line of sight, a vehicle speed sensor, a steering angle sensor, and the like (not shown). Based on the information, the driving state detection means 12 for detecting the driving state of the vehicle and the detection result of the line-of-sight recognition means 11 are inputted, and the degree of danger related to the driving of the vehicle is calculated from the signal of the driving state detection means 12 Control means 13 having a built-in risk judgment means 131 and display means 14 whose display state is controlled by the control means 13.

  The line-of-sight recognizing means 11, the running state detecting means 12, the control means 13, and the display means 14 constitute a vehicle display device 2 as one body in one housing as shown in FIG. Alternatively, the constituent elements 11, 12, 13, and 14 are arranged physically separated from each other and electrically connected by a wire harness to constitute the vehicle display device 2 of the present invention as a whole. Also good.

  The display means 14 will be described below as a known backlit dot matrix liquid crystal display. However, the display means 14 is not limited to the liquid crystal display device, and may be a known organic EL display or various segment type displays. However, it does not depart from the gist of the present invention.

  FIG. 4 is a front view of the display state of the vehicle display device 2 of the present invention. In this embodiment, known navigation map information 23a is displayed on the display means 14, and a camera 22 for imaging the driver's face and a near infrared illumination unit 21 serving as a light source necessary for night imaging are provided. The housing 24 is integrally stored.

  As shown in FIG. 12, the line-of-sight recognition means 11 includes a camera 22 including a known CMOS image sensor and a lens, a near-infrared illumination unit 21, and eyes from the driver's face image captured by the camera 22. Feature point extraction and an image recognition unit 111 for calculating the line-of-sight direction. Note that how to calculate the driver's line-of-sight direction by the image recognizing unit 111 is a known technique, and a description thereof will be omitted.

  FIG. 13 schematically shows a configuration of a known vehicle surrounding obstacle recognition means 16. A plurality of short-distance imaging cameras for imaging a nearby obstacle at a short distance to a vehicle, a long-distance imaging camera for imaging a long-distance obstacle ahead, and a plurality for measuring a distance to an obstacle around the vehicle Each ultrasonic sensor and a laser or radar that measures the distance to an obstacle at a long distance are used. The configuration of the vehicle surrounding obstacle recognition means is not limited to that shown in FIG. 13 and can be implemented in any form.

  Next, the operation of the control means 13 will be described with reference to FIGS. First, as shown in FIG. 8, the risk determination means 131 included in the control means 13 in this embodiment includes the vehicle traveling speed, the steering angle of the steering wheel, the operating state of the wiper, the detection result of the surrounding obstacle recognition means, and the lighting device. The driving risk X approaching the driving environment of the vehicle is calculated by using the operating state of the vehicle, the operating state of the direction indicator, the road surface freezing index estimated from the outside air temperature, the map information, and the like. However, the present invention is not limited to this, and for example, a result of detecting an oncoming vehicle by a known vehicle-to-vehicle communication function may be used, or it is needless to say that the plurality of factors may be partially combined and selectively employed. Yes.

  The values of the above factors are measured as continuous quantities such as those that are quantified to 1 or 0 based on whether the lighting device is operating or not, and those that are 0 ± α such as the steering angle. There is something.

The calculation of the degree of risk X as one embodiment is a so-called vehicle speed proportional value that increases with the vehicle speed. In another embodiment, the risk level X is calculated by multiplying the value of the factor that has been selectively adopted by an arbitrarily weighted coefficient and summing the values of the factors. .
For example, in the map information, when an intersection is approaching in front of a running vehicle, an index that increases as the distance between the intersection and the vehicle decreases is adopted as a factor value for calculating the risk level X. .

  FIG. 3 is a diagram showing a configuration in which all of the above factors are input to the risk judging means 131. Compared to the configuration of FIG. 1, the risk judgment means 131 inputs the detection result of the vehicle surrounding obstacle recognition means 16, and from the known navigation system 17 in which driver information such as age and years of driving experience is registered. Map information representing the terrain around the vehicle where the vehicle is traveling is input together with the person information.

  FIG. 9 is a view showing the relationship of the display visual permissible time T-Lim with respect to the degree of risk X. When the risk level X is 0 (safe), the value of T-Lim becomes infinite, and as the risk level X increases, the value of T-Lim decreases rapidly. Also. The minimum value of T-Lim is T-Lim (min). The value of T-Lim (min) is preferably about 1 second.

  In addition, the relationship between the risk level X and the display visual permissible time T-Lim shown in FIG. 9 does not incur a danger due to the time when the driver does not look at the vehicle in the traveling direction in the actual driving environment, and It should be appropriately set as a time when the display content of the previous display means 14 can be easily recognized.

  By operating as described above, the display visual permissible time T-Lim is calculated, and the control means 13 performs the visual line warning process shown in FIG.

The line-of-sight recognition means 11 detects the driver's line-of-sight direction, and the control means 13 determines in S20 whether or not the driver's line-of-sight direction is viewing the display means 14.
If the determination result is N, in S21b, a gaze time counter, which will be described later, is reset, and the process ends.

When the determination result is Y, the gaze time counter is used to measure the time during which the driver is viewing the display means 14 and the gaze time counter is used. Count up.

Next, in step S22, the control means 13 compares the value of the gaze time counter with the value of the display visual permissible time T-Lim, and if gaze time counter value> T-Lim is affirmed, step S22 is performed. In S23, the light emission luminance of the display means 14 is reduced. The reduction of the light emission luminance is the minimum light amount that allows the driver to recognize the display content of the display means 14, and is set to L2 for the desired daytime driving and different reduction amounts such as L4 for the nighttime driving. .
It should be noted that the amount of reduction in the light emission luminance may be maximized, that is, the display unit 14 may be turned off. However, if the display means 14 is turned off, the driver may misunderstand that the display means 14 has failed. Therefore, it is desirable that the minimum light amount be visible as described above.

  In S25, the control means 13 determines whether or not the dimming state of the display means 14 has continued for a predetermined time. If the determination result is N, the process ends. The line-of-sight warning process is repeatedly executed at a constant cycle of, for example, every 10 milliseconds by S28.

  If the result of the determination is affirmative in S25, the control means 13 overwrites the warning character “CAUTION FOR FORWARD!” On the display image of the display means 14 in S27. At that time, the reduction of the light emission luminance of the display means 14 is canceled and the driver is warned with a luminance that is easy to see. At the same time, the control means 13 is configured to drive the buzzer 132 shown in FIG.

  The display image of the vehicle display device 2 according to the present invention as described above will be described with reference to FIG. That is, the control means 13 reduces the light emission luminance of the display means 14 as shown by 23b in FIG. 5 when it is determined that the driver is gazing at the display means 14 for a long time and driving is dangerous. . However, if the driver still keeps gazing at the display means 14, the warning character 23 c of “CAUTION FOR FORWARD!” Is displayed and a warning is given by sound so as to urge the driver's line of sight toward the outside of the vehicle. It is like that.

  In S22, the control means 13 compares the value of the gaze time counter with the value of the display visual permissible time T-Lim, and if the gaze time counter value> T-Lim is negative, the control unit 13 determines in S24 that the driver Is set to the light emission luminance L1 (daytime) or L3 (nighttime) that allows the display contents of the display means 14 to be recognized most easily. At the same time, the process of erasing the warning character displayed in S27 and the warning by the sound are interrupted by S26 and the process is terminated.

  As described above, when the control means 13 adopts negative in S20, the gaze time counter is reset in S21b, so that the visual line warning process always passes through S24 and the display means 14 emits light. The brightness is kept in a normal state.

However, if the driver gazes at the display means 14 for a short time and then returns to the vehicle traveling direction and grasps the external situation, the next time the display means 14 is viewed, Since the light emission luminance of the display means 14 is not lowered, the display contents of the display means 14 can be easily recognized, and the convenience is not impaired.

  In the present embodiment, as described above, when the control means 13 determines that the driver's line of sight deviates from the traveling direction of the vehicle and the driving is dangerous, the control means 13 warns by reducing the light emission luminance of the display means 14. However, the contrast of the image displayed on the display unit 14 may be drastically reduced without changing the light emission luminance of the display unit 14 so that the display image can be recognized as the minimum contrast.

Next, the travel control process of the control means 13 will be described based on FIG. Since the processing of steps S40, S41, S42, and S43 is the same as the above-described line-of-sight warning processing, description thereof is omitted. The travel control process is repeatedly executed at a constant cycle of, for example, every 10 milliseconds, and the configuration for executing this process is such that the control means 13 and the vehicle control means 15 are electrically connected as shown in FIG. To connect to.

  When the gaze time counter value> T-Lim is Y in S43, the control means 13 stores the vehicle traveling speed Vmax when the vehicle first passes S44. Subsequently, each time this process is repeated, the control means 13 compares the stored value of the vehicle speed Vmax with the current vehicle speed. If the current vehicle speed exceeds Vmax, the control means 13 determines whether or not the engine control ECU is not shown. The engine output is instructed to decrease, or a brake request is instructed to a brake control means (not shown). It should be noted that when the driver is operating in a direction to reduce the amount of operation of the accelerator pedal, the engine output increase instruction process for maintaining the vehicle speed Vmax is not performed.

  By the above processing, the driver is gazing at the display means 14, and when the gazing time exceeds an allowable time, even if the driver keeps stepping on the accelerator pedal, the traveling speed of the vehicle does not increase. The possibility that the driver falls into an unexpected dangerous situation can be reduced.

  In S43, when the gaze time counter value> T-Lim is N, in S45, the normal engine output based on the driver's current accelerator operation amount and the engine output changed to maintain the vehicle speed Vmax. Reduce the difference gently to return to normal engine control. The travel control process is repeatedly executed in S46.

  As described above, when the driver gazes at the display means 14 and a dangerous situation occurs, the traveling speed of the vehicle does not increase, and when the driver stops gazing at the display means 14, Since the relationship with the engine output can be gradually restored to the normal state, the vehicle speed and the engine output do not change suddenly with respect to the driver's line of sight movement, resulting in a dangerous driving state that the driver cannot control. Can be prevented.

  The warning / peripheral image display process will be described below with reference to FIG. In step S30, the control means 13 determines whether vehicle warning information or surrounding images, that is, known driving support information is displayed on the display means 14. When the determination result is affirmed, the gaze time counter is reset, and when the determination result is negative, the process is terminated without performing anything. The warning / peripheral image display process is repeatedly executed in S32.

As a result, the result of S22 in the visual line warning process of FIG. 7 is N. In S24, the luminance (or contrast) of the display means 14 is set to maintain a normal visibility, and the warning character is deleted in S26. To do. At the same time, in FIG. 11, the determination result in S43 is N in the travel control process, and the driver's accelerator operation amount and engine output are maintained in the normal state.
Therefore, when the priority of the information displayed on the display unit 14 is as high as the driving support information, even if the driver continues to watch the display unit 14, the light emission luminance and contrast of the display unit 14 are reduced. There is no sacrifice in convenience.

  Hereinafter, the night vision process will be described with reference to FIG. The control means 13 determines from the information of the traveling state detecting means 12 whether or not the vehicle is traveling at night based on whether or not the lights are operating. If the determination result is N, the processing is interrupted as it is.

  If it is determined in S10 that the vehicle is traveling at night, the detection result of the line-of-sight recognition unit 11 is referred to in S11 to determine whether the driver is viewing the display unit 14 or not. If the driver is viewing the display means 14, the light emission luminance of the display means 14 is set to a level L3 that is easy to recognize in S13. If the driver is not viewing the display means 14, the light emission luminance of the display means 14 is reduced to L4, which is the nighttime visibility limit, in S12, and the process is completed. The nighttime anti-glare process is repeatedly executed in S14.

By such processing, the brightness of the display device 14 that is not viewed by the driver in the passenger compartment during night driving can be reduced to prevent dazzling, and the visibility of obstacles outside the passenger compartment can be improved, thereby enabling safe driving.
The nighttime antiglare process, the visual line warning process, the warning / peripheral image display process, and the travel control process may be performed simultaneously.

  As described above, the vehicle display device and the control method thereof according to the present invention reduce traffic accidents caused by lack of attention in the vehicle traveling direction when the driver watches the vehicle interior equipment. Can make a significant social contribution.

2 vehicle display device 11 line-of-sight recognition means 12 travel state detection means 13 control means 14 display means 15 vehicle control means 16 vehicle surrounding obstacle recognition means 17 navigation system 21 near-infrared light emitting part 22 camera 23 casing 111 image processing part

Claims (11)

  Display means mounted on the vehicle for displaying information, line-of-sight recognition means for detecting the line-of-sight direction of the driver of the vehicle, and driving state detection for detecting the driving state of the vehicle from the operating state and driving environment of each part of the vehicle Means for controlling the display means based on the recognition result of the eye gaze recognition means and the judgment result of the risk judgment means. Control means, the control means of the display means when the time when the driver is looking at the display means exceeds a display visual permissible time determined by the determination result of the risk determination means A display device for a vehicle characterized by changing a display state.   The control means acts to reduce the screen emission luminance of the display means when the time during which the driver is viewing the display means exceeds a display visual permissible time determined by the determination result of the risk determination means. The control method of the display apparatus for vehicles of Claim 1 characterized by the above-mentioned.   The control means reduces the contrast of the display image of the display means when the time during which the driver is viewing the display means exceeds a display visual allowable time determined by the determination result of the risk determination means. The method for controlling a vehicle display device according to claim 1, wherein the vehicle display device operates.   The lowering of the screen light emission luminance or the lowering of the display contrast performed by the control means on the display means is the lower limit brightness or lower limit at which the driver can view the display contents on the display means in the driving environment of the vehicle. The method for controlling a display device for a vehicle according to claim 1, wherein:   The control means, such as “Warning forward!” Is displayed on the screen of the display means when the time that the driver is viewing the display means exceeds the display visual permissible time determined by the determination result of the risk determination means. The method for controlling a vehicle display device according to claim 1, wherein warning display is performed.   In addition to the invention of claim 1, a warning sound generating means for generating a warning sound is provided, and the control means displays the time during which the driver is viewing the display means determined by the determination result of the risk level determination means. The vehicle display device according to claim 1, wherein the warning sound generating means is caused to emit a sound when a visual permissible time is exceeded.   In addition to the invention of claim 1, the vehicle surrounding obstacle recognizing means is provided, and the risk degree judging means is configured to detect the vehicle from the detection result of the traveling state detecting means and the detection result of the vehicle surrounding obstacle recognizing means. A vehicle display device that estimates the travel risk of the vehicle.   The risk level judging means calculates a numerical risk level based on the travel speed of the vehicle, or in addition to the travel speed, the steering angle of the vehicle, the wiper operating state, the detection result of the surrounding obstacle recognition means, At least one piece of information from the operating state of the device, the operating state of the direction indicator, the road surface freezing index estimated from the outside temperature, the road form obtained from the map information, and the driver information (age / driving experience) 2. The method for controlling a vehicle display device according to claim 1, wherein the degree of risk is calculated based on the risk level.   In addition to the invention of claim 1, the control means displays the display means when the time that the driver is viewing the display means exceeds a display visual permissible time determined by the determination result of the risk determination means. 2. The vehicle according to claim 1, wherein the state of the vehicle is changed, and the engine output of the vehicle is limited or the brake device of the vehicle is operated so that the vehicle does not exceed the vehicle speed at which the vehicle is traveling at the time. Display device control method.   In addition to the ninth aspect of the invention, when the control means detects that the driver stops viewing the display means by the line-of-sight recognition means during a period in which the engine output of the vehicle is limited. 10. The vehicle display device control method according to claim 9, wherein the control of the engine output is released gently.   The control means prohibits control for changing the display state of the display means when the information displayed on the display means is driving support information such as a bird's-eye view around the vehicle or a back monitor image. The method for controlling a vehicle display device according to claim 1.

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