JP2018120267A - On-vehicle display method and on-vehicle display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle display method and an on-vehicle display device that can suppress a degradation of convenience.SOLUTION: An on-vehicle display device comprise: a brain wave sensor 60 for detecting a brain activity of a crew; a display DP visible to the crew; and a controller 10 for determining whether or not the crew feels discomfort on the basis of the brain activity detected by the brain wave sensor 60 when an image is displayed on the display DP, and changes the image displayed on the display DP when it is determined that the crew feels discomfort.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an in-vehicle display method and an in-vehicle display device that control an image provided to a vehicle occupant.

  Conventionally, as a technique for controlling an image provided to a vehicle occupant, for example, there is a technique described in Patent Document 1. In the technique described in Patent Document 1, when the amount of information displayed as a navigation image on the display is relatively small and the screen change is relatively small, an image that provides information instead of the navigation image Appears on the display.

JP 2005-009991 A

However, the amount of information displayed on the display changes depending on the driving load and the like. For this reason, in the technique described in Patent Document 1, there is a problem that information becomes complicated depending on the state of the occupant, and convenience may be reduced.
The present invention has been made paying attention to the above-described problems, and an object thereof is to provide an in-vehicle display method and an in-vehicle display device that can suppress a decrease in convenience.

  According to one aspect of the present invention, when it is determined that there is a sense of incongruity of the occupant from the brain activity of the occupant detected when the image is displayed on a display that is visible to the occupant of the vehicle, the image displayed on the display To change.

  According to the present invention, when there is a sense of incongruity with an occupant with respect to an image displayed on the display, the deterioration of convenience can be suppressed by changing the image displayed on the display. It becomes possible to provide a display method and a vehicle-mounted display device.

It is a block diagram showing the structure of the vehicle-mounted display apparatus of 1st embodiment of this invention. It is explanatory drawing showing an example of an electroencephalogram measurement. It is a figure showing the change of the electric potential measured with the electrode put on the skin near the eyeball. It is a figure showing the image before performing the process which reduces information amount. It is a figure showing the image which performed the process which reduces information amount with respect to the image shown to FIG. 4A. It is a flowchart showing the display control process of 1st embodiment of this invention. It is a figure showing the modification of 1st embodiment of this invention, and is a figure showing the image before performing the process which reduces information content. It is a figure showing the modification of 1st embodiment of this invention, and is a figure showing the image which performed the process which reduces information amount with respect to the image shown to FIG. 6A. It is a block diagram showing the structure of the vehicle-mounted display apparatus of 2nd embodiment of this invention. It is a flowchart showing the display control process of 2nd embodiment of this invention. It is a flowchart showing the display control process of 3rd embodiment of this invention. It is a flowchart showing visibility adjustment processing. It is a flowchart showing an information amount adjustment process. It is a flowchart showing a display content adjustment process.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. However, the drawings are schematic. Moreover, it is a matter of course that the drawings include portions having different dimensional relationships and ratios. Further, the following embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, structure, and arrangement of components. Etc. are not specified as follows. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
(Configuration of in-vehicle display device)
The configuration of the in-vehicle display device 1 will be described with reference to FIGS.
The in-vehicle display device 1 is mounted on a vehicle, and as shown in FIG. 1, an ambient condition sensor 2, an operation state sensor 4, a biological information sensor 6, a display DP, a speaker SP, a controller 10, and the like. .
The ambient condition sensor 2 detects the ambient condition of the vehicle, and sequentially outputs information indicating the detected ambient condition to the controller 10. The ambient condition sensor 2 includes, for example, a plurality of sensors that respectively acquire information on the ambient condition of the vehicle. In the first embodiment, as an example, a case will be described in which the ambient condition sensor 2 includes a map database 20, a GPS receiver 22, and a communication device 24.

The map database 20 is a storage device that stores map data. The map database 20 is composed of a storage medium such as a semiconductor memory or a disk medium, for example. In addition to map data in a general car navigation system such as a road shape including curvature and width, road type, number of lanes, etc., the map database 20 includes the position of the lane boundary, the traffic zone classification, and the position of the features around the road. In addition, high-definition map data including information on the shape and the like is stored.
The GPS receiver 22 calculates the latitude, longitude, and altitude of the vehicle based on the radio wave received from the artificial satellite, and matches the map data stored in the map database 20 to determine the current position of the vehicle in the map data. get. That is, the GPS receiver 22 and the map database 20 constitute a positioning device that detects the current position of the vehicle in the map data.

  The communicator 24 is a communication interface that acquires the surrounding situation of the vehicle from the outside by wireless communication. The communication device 24 can receive various information from, for example, an intelligent road traffic system (ITS) that transmits traffic information such as traffic congestion information and traffic regulation information in lane units, weather information, and the like in real time. ITS includes inter-vehicle communication, road-to-vehicle communication, VICS (registered trademark) (Vehicle Information and Communication System), telematics, and the like. The communicator 24 detects the acceleration / deceleration of other vehicles around the vehicle, the relative position with respect to the vehicle, and the like, for example, by inter-vehicle communication.

The driving state sensor 4 detects the driving state of the vehicle, and sequentially outputs information indicating the detected driving state to the controller 10. The driving state sensor 4 is composed of, for example, a plurality of sensors that respectively acquire information on the driving state of the vehicle. In the first embodiment, as an example, a case in which the driving state sensor 4 includes an accelerator opening sensor 40, a brake switch 42, and a steering operation amount sensor 44 will be described.
The accelerator opening sensor 40 detects the accelerator opening of the vehicle from the amount of depression of the accelerator pedal of the vehicle, for example. The brake switch 42 detects the operating state of the vehicle brake by the driver, that is, the operating state of the brake. The steering operation amount sensor 44 detects the operation angle of the steering wheel of the vehicle or the steering angle of the steering wheel.

  The biological information sensor 6 detects biological information of a vehicle occupant (driver) and sequentially outputs the detected biological information to the controller 10. The occupant's biological information is biological information that includes brain activity information and can estimate a sense of discomfort felt by the occupant. The biometric information of the occupant can be detected based on at least one of the occupant's brain wave, cerebral blood flow, heart rate, respiration, perspiration, and face image. Among these biological information, the brain activity of the occupant is detected from the electroencephalogram and cerebral blood flow. In the first embodiment, a case where the biological information sensor 6 includes an electroencephalogram sensor 60, a camera 62, and a heart rate sensor 64 will be described as an example.

  The electroencephalogram sensor 60 is a sensor that detects an occupant's electroencephalogram in real time during driving of the vehicle. The electroencephalogram sensor 60 includes a plurality of electrodes attached to the head of the occupant. The plurality of electrodes are arranged at Fz, Fcz, Cz, CPz, which are positions related to the cognitive function, in the top of the occupant as shown in FIG. 2, for example, in accordance with the International 10-20 Law. In FIG. 2, the electrodes 8 arranged on Fz, Fcz, Cz, and CPz are represented as an electrode 8Fz, an electrode 8Fcz, an electrode 8Cz, and an electrode 8CPz, respectively. The plurality of electrodes 8 may be formed of, for example, a wearable electrode cap or headphones, or may be formed of a plurality of electrodes provided on the headrest so as to be easily placed on the head of the passenger. Good.

The camera 62 is disposed at a position where the face of the occupant (driver) is photographed from the front in the passenger compartment of the vehicle P. For example, a CCD camera or a combination of a near infrared LED and an infrared camera can be used. It is. The camera 62 captures an image of the occupant in order to detect the sight line, facial expression, movement, etc. of the occupant.
The heart rate sensor 64 is a sensor that measures the occupant's heart rate in real time during driving of the vehicle, and includes an electrode attached to a steering and a seat provided in the vehicle. The heart rate sensor 64 measures the occupant's heart rate as biometric information that can estimate the driving load (driving workload) received by the occupant (driver) with respect to the occupant of the vehicle.

The display DP is connected to the controller 10 and is disposed on a console or the like in the vehicle cabin so that the occupant can visually recognize the display DP. As the display DP, for example, a display provided in the navigation system or a display arranged on the instrument panel is used. Further, when receiving an output image signal (described later) from the controller 10, the display DP displays an image (navigation image or the like) included in the output image signal.
The speaker SP is connected to the controller 10 and is disposed on a console or the like in the vehicle interior. The speaker SP outputs sound corresponding to an image (navigation image or the like) included in the output image signal.

The controller 10 is composed of a microcomputer, for example. The microcomputer has, for example, a configuration including a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like.
FIG. 1 shows a functional configuration example of the controller 10. The controller 10 implements a computer program stored in the ROM with a CPU, thereby providing a brain information acquisition unit 10A, a caution state acquisition unit 10B, a discomfort database 10C, a discomfort determination unit 10D, and a display state acquisition unit 10E. The functions of the information amount determination unit 10F and the image control unit 10G are realized.

The brain information acquisition unit 10 </ b> A acquires the brain information of the occupant using the biological information received from the biological information sensor 6. The brain information acquisition unit 10A that has acquired the brain information of the occupant outputs an information signal including the acquired brain information (may be described as “brain information signal” in the following description) to the discomfort determination unit 10D. 1st embodiment demonstrates the case where the pattern of the brain wave of a passenger | crew measured with the some electrode 8 is acquired as a biological information of a passenger | crew. Therefore, the brain information signal includes an electroencephalogram pattern measured by the plurality of electrodes 8.
The attention state acquisition unit 10B measures the attention state of the occupant. The attention state acquisition unit 10B that measures the attention state of the occupant outputs an information signal including the measured attention state (in the following description, may be described as “attention state signal”) to the uncomfortable feeling determination unit 10D. The occupant's attention state is biological information that can be estimated that the occupant's attention is directed to the screen of the display DP. The caution state of the occupant can be detected using at least one of an electrooculogram and a face image corresponding to the occupant's brain wave.

  The electrooculogram is a diagram showing a recording of a steady potential generated between before and after the eyeball and a change in potential correlated with eye movement, and an electrode placed on the skin near the eyeball (for example, placed at a position Fz in FIG. 2). Electrode 8Fz). In the first embodiment, as an example, the case where the configuration of the attention state acquisition unit 10B is configured to measure the attention state of the occupant using an electrocardiogram corresponding to the electroencephalogram detected by the electroencephalogram sensor 60 will be described. When the attention state is measured using an electrooculogram, for example, as shown in FIG. 3, the change in the potential V measured by the electrode 8Fz is measured, and the eyeball is stopped from the movement of the mixed electrooculogram. A potential V indicating that the current is being detected is detected. In FIG. 3, the point in time when the potential V indicating that the eyeball is stationary is detected by the symbol PT.

In the discomfort database 10C, an electroencephalogram pattern used for detecting the discomfort of the occupant is stored. The electroencephalogram pattern stored in the sense of incongruity database 10C is an electroencephalogram pattern when it is determined that the passenger has a sense of discomfort in the past. That is, the brain activity when it is determined that there is a sense of discomfort in the past is stored in the discomfort database 10C.
The discomfort determination unit 10D receives the brain information signal and the attention state signal. Then, at the timing of receiving the attention state signal including the attention state at the time point PT, refer to the brain wave pattern included in the brain information signal, that is, the brain wave pattern at the time point PT among the brain wave patterns measured in real time. To do. Further, by comparing the electroencephalogram pattern at the time point PT with the electroencephalogram pattern stored in the uncomfortable feeling database 10C, it is determined whether or not the occupant feels uncomfortable (whether or not the uncomfortable feeling is felt). The discomfort determination unit 10D that has determined whether or not there is a discomfort outputs an information signal including the determination result (may be described as “discomfort determination signal” in the following description) to the information amount determination unit 10F and the image control unit 10G. To do. The discomfort determination unit 10D determines that there is discomfort, for example, when the degree of match between the brain wave pattern at the time point PT and the brain wave pattern stored in the discomfort database 10C is higher than a preset match degree threshold. judge.

That is, the brain activity when it is determined that there is a sense of discomfort in the past is stored in the discomfort database 10C. Then, the discomfort determination unit 10D determines the presence or absence of discomfort according to the comparison between the brain information detected by the brain information acquisition unit 10A and the brain information stored in the discomfort database 10C.
The display state acquisition unit 10E acquires the display state of the image displayed on the display DP. The display state acquisition unit 10E that acquired the display state outputs an information signal including the acquired display state (may be described as “display state signal” in the following description) to the information amount determination unit 10F. In the first embodiment, as an example, a case will be described in which the display state acquired by the display state acquisition unit 10E is the number of characters included in the image displayed on the display DP.

  The information amount determination unit 10F stores a preset information amount threshold value α1. In the first embodiment, since the display state is the number of characters, the information amount threshold α1 is a preset number of characters. Further, the information amount determination unit 10F receives an input of the uncomfortable feeling determination result signal and the display state signal. Then, when the uncomfortable feeling determination result signal includes a determination result that there is an uncomfortable feeling, it is determined whether or not the number of characters included in the display state signal exceeds the information amount threshold value α1. The information amount determination unit 10F that has determined whether or not the number of characters exceeds the information amount threshold value α1 uses the information signal including the determination result (in the following description, may be described as “information amount determination signal”) as an image. Output to the control unit 10G.

The information amount threshold value α1 is set by the following procedure, for example.
Initially (at the time of shipment, etc.), an information amount (number of characters) such as nationwide average data generally displayed is set. Then, when the determination result that there is a sense of incongruity is acquired, the average value of the value obtained by adding the information amount threshold value α1 to the information amount (number of characters) at that time is the information amount threshold value used in the information amount determination unit 10F after the next time. Set (update) as α1.
The image control unit 10G receives a sense of incongruity determination signal and an information amount determination signal, and receives a command signal from the input device IF. Then, an output image signal is generated according to the unnaturalness determination signal, the information amount determination signal, and the command signal, and the generated output image signal is output to the display DP.
The input device IF is, for example, a navigation system touch panel (also used as a display DP). Further, as the input device IF, for example, a remote controller or the like can be used. The command signal is, for example, a signal for causing the display DP to output a navigation image from the current location to the destination when the occupant inputs the destination.

The output image signal is generated in the following procedure.
When the uncomfortable feeling determination result signal includes a determination result that there is no uncomfortable feeling, for example, an output image signal for displaying a navigation image or the like on the display DP is generated according to the command signal.
When the uncomfortable feeling determination result signal includes a determination result that there is a sense of incongruity, an output image signal for controlling the information amount of the image displayed on the display DP is generated according to the information amount determining signal. Specifically, when the information amount determination signal includes a determination result that the number of characters included in the display state signal exceeds the information amount threshold value α1, an output image that reduces the information amount of the image displayed on the display DP. Generate a signal. In the first embodiment, since the display state is the number of characters, the process of reducing the information amount of the image displayed on the display DP is, for example, as shown in FIG. This is a process to reduce the number of characters included. FIG. 4A is a diagram illustrating an image (an image before the process) before performing the process of reducing the information amount. FIG. 4B is a diagram illustrating an image (processed image) obtained by performing a process of reducing the information amount on the image illustrated in FIG. 4A. On the other hand, when the information amount determination signal includes a determination result that the number of characters included in the display state signal is equal to or less than the information amount threshold value α1, an output image signal that increases the information amount of the image displayed on the display DP is generated. . In the first embodiment, since the display state is the number of characters, the process of increasing the information amount of the image displayed on the display DP is a process of increasing the number of characters included in the image displayed on the display DP.

(Processing performed by the in-vehicle display device 1)
One example of processing performed by the in-vehicle display device 1 will be described with reference to FIGS. 1 to 4 and FIG. In the following description, the process performed by the in-vehicle display device 1 may be referred to as “display control process”.
As shown in FIG. 2, when the display control process is started (START), first, the process of step S100 is performed.
In step S100, in order to provide information required by the occupant, a process of displaying a navigation image or the like on the display DP ("display display" shown in the figure) is performed. When the process of step S100 is performed, the display control process proceeds to step S102. In step S102, in order to determine whether or not there is a sense of discomfort, the discomfort determination unit 10D determines whether or not the occupant feels discomfort with respect to the image displayed on the display DP ("display" shown in the figure). I feel uncomfortable inside ”).

If it is determined in step S102 that the occupant is feeling uncomfortable (“Yes” shown in the figure), the display control process proceeds to step S104. On the other hand, if it is determined in step S102 that the occupant does not feel uncomfortable ("No" shown in the figure), the display control process proceeds to step S100.
In step S104, in order to obtain parameters for changing the image, the display state obtaining unit 10E obtains an information amount for the image displayed on the display DP ("acquire information amount" shown in the figure). ")I do. When the process of step S104 is performed, the display control process proceeds to step S106. In step S106, in order to acquire the parameter for changing the image, the information amount determination unit 10F determines whether the information amount that is the number of characters acquired in step S104 exceeds the information amount threshold α1. ("Information amount> Information amount threshold value α1" shown in the figure) is performed.

If it is determined in step S106 that the information amount exceeds the information amount threshold value α1 (“Yes” shown in the figure), the display control process proceeds to step S108. On the other hand, when it is determined in step S106 that the information amount is equal to or less than the information amount threshold value α1 (“No” shown in the figure), the display control process proceeds to step S110.
In step S108, the image control unit 10G performs a process of reducing the information amount of the image displayed on the display DP ("decrease information amount" shown in the figure) (for example, from the state of FIG. 4A to the state of FIG. 4B). To). Thereby, in step S108, it is suppressed that the information provided to a passenger | crew becomes complicated. If the process of step S108 is performed, the display control process returns to the process of step S100 (RETURN).
In step S110, the image control unit 10G performs a process of increasing the information amount of the image displayed on the display DP ("increase the information amount" shown in the figure) (for example, from the state of FIG. 4B to the state of FIG. 4A). To). Thereby, in step S110, it is possible to improve the convenience in obtaining information during driving. When the process of step S110 is performed, the display control process returns to the process of step S100 (RETURN).

(Operation)
With reference to FIGS. 1 to 5, an example of an operation performed using the vehicle-mounted display device 1 of the first embodiment will be described.
When the vehicle is running, the brain wave of the occupant is measured by the brain wave sensor 60. In addition to this, when the vehicle travels, for example, a navigation image representing a travel route from the current location to the destination is displayed on the display DP in accordance with the operation of the input device IF by the occupant. When the electrode 8Fz detects the potential V indicating that the eyeball is stationary in the state where the image is displayed on the display DP, the discomfort determination unit 10D detects the occupant with respect to the image displayed on the display DP. It is determined whether or not the user feels uncomfortable. The image displayed on the display DP is not limited to an image provided manually according to the operation of the input device IF by the occupant. For example, the map data and the current vehicle information such as an image showing information on tourist facilities are displayed. The image may be automatically provided according to the position.

When the uncomfortable feeling determination unit 10D determines that the occupant feels uncomfortable, the information amount determination unit 10F determines whether the information amount acquired by the display state acquisition unit 10E exceeds the information amount threshold value α1. . When the information amount determination unit 10F determines that the information amount acquired by the display state acquisition unit 10E exceeds the information amount threshold value α1, the image control unit 10G decreases the information amount of the image displayed on the display DP. Processing (see FIGS. 4A and 4B) is performed.
That is, in the in-vehicle display device 1 according to the first embodiment, the controller 10 determines whether or not the passenger feels uncomfortable from the brain activity detected by the electroencephalogram sensor 60 when an image is displayed on the display DP. If determined, the displayed image is changed.

Therefore, in the case of the in-vehicle display device 1 according to the first embodiment, when it is determined that an occupant such as a driver feels uncomfortable with respect to the image displayed on the display DP, the occupant feels uncomfortable. Can be changed. The above-described electroencephalogram sensor 60 corresponds to a sensor that detects the occupant's brain activity.
Further, as described above, in the in-vehicle display method implemented by the operation of the in-vehicle display device 1 of the first embodiment, the brain activity of the occupant is detected when an image is displayed on the display DP, and the detected brain Judgment of occupant discomfort from activities. If it is determined that there is a sense of discomfort, the image displayed on the display DP is changed.

In the in-vehicle display method of the first embodiment, the caution state of the occupant is detected, and when the caution state with respect to the image displayed on the display DP is detected, it is determined whether or not there is a sense of discomfort.
Furthermore, in the vehicle-mounted display method according to the first embodiment, the image displayed on the display DP is changed by changing (decreasing or increasing) the display state (number of characters) of the image displayed on the display DP.
In addition, in the in-vehicle display method of the first embodiment, brain activity when it is determined that there is a sense of incongruity in the past is accumulated, and the sense of incongruity is determined according to the comparison between the detected brain activity and the accumulated brain activity. The presence or absence of is determined.
The above-described first embodiment is an example of the present invention, and the present invention is not limited to the above-described first embodiment, and the present invention may be applied to other forms than this embodiment. Various modifications can be made according to the design or the like as long as they do not depart from the technical idea.

(Effects of the first embodiment)
If it is the vehicle-mounted display method using the vehicle-mounted display apparatus 1 of 1st embodiment, it will become possible to show the effect described below.
(1) When an image is displayed on the display DP, the occupant's brain activity is detected, the presence / absence of the occupant's discomfort is determined from the detected brain activity, and when it is determined that there is a discomfort, the display DP displays Change the image.
For this reason, if there is a sense of incongruity with the passenger on the image displayed on the display DP, the image displayed on the display DP can be displayed on the display DP by changing the image displayed on the display DP. Is possible. As a result, it is possible to prevent the information provided to the passenger from becoming complicated, and it is possible to provide an in-vehicle display method capable of suppressing a decrease in convenience.

(2) When the caution state of the passenger is detected and the caution state with respect to the image displayed on the display DP is detected, it is determined whether or not there is a sense of discomfort. As a result, it is possible to determine whether or not the passenger feels uncomfortable with respect to the image displayed on the display DP at an appropriate timing, and it is possible to improve the accuracy of determining the presence or absence of the uncomfortable feeling.
(3) The image displayed on the display DP is changed by changing the display state of the image displayed on the display DP. As a result, an image corresponding to the occupant's state can be displayed on the display DP without requiring complicated processing.

(4) The brain activity when it is determined that there is a sense of discomfort in the past is accumulated, and the presence or absence of discomfort is determined according to the comparison between the detected brain activity and the accumulated brain activity. As a result, it is possible to determine whether or not there is a sense of incompatibility by comparing the data with a past record determined in the past and the data detected at the present time, and it is possible to improve the accuracy of determining whether or not there is a sense of discomfort.
Moreover, if it is the vehicle-mounted display apparatus 1 of 1st embodiment, it will become possible to show the effect described below.
(5) When an image is displayed on the display DP visible to the occupant, the presence or absence of the occupant's discomfort is determined from the brain activity detected by the brain wave sensor 60 that detects the occupant's brain activity. And if it determines with a sense of incongruity, the controller 10 which changes the image currently displayed on the display DP is provided.

  For this reason, if there is a sense of incongruity with the passenger on the image displayed on the display DP, the image displayed on the display DP can be displayed on the display DP by changing the image displayed on the display DP. Is possible. As a result, it is possible to prevent the information provided to the occupant from being complicated, and it is possible to provide the vehicle-mounted display device 1 that can suppress a decrease in convenience.

(Modification of the first embodiment)
(1) In the first embodiment, the image displayed on the display DP is changed by changing the display state of the image displayed on the display DP. However, the present invention is not limited to this. That is, the image displayed on the display DP may be changed by changing the visibility of the image displayed on the display DP. Further, the image displayed on the display DP may be changed by changing the display content of the image displayed on the display DP. Therefore, the image displayed on the display DP may be changed by changing at least one of the visibility, display state, and display content of the image displayed on the display DP.

(2) In the first embodiment, the image displayed on the display DP is changed at the timing when it is determined that there is an uncomfortable feeling of the occupant when the occupant feels uncomfortable with respect to the image displayed on the display DP. However, the present invention is not limited to this. That is, if it is determined that the passenger feels uncomfortable when the image displayed on the display DP is changed, the timing for changing the image displayed on the display DP may be changed. Note that the time point when the image displayed on the display DP is changed is, for example, from the image before the process of reducing the amount of information shown in FIG. 4A to the image shown in FIG. 4A shown in FIG. 4B. On the other hand, it is the time when the image is changed to the image on which the processing for reducing the information amount is performed.
In this case, the time for changing the image displayed on the display DP is delayed from the timing at which it is determined that there is a sense of incongruity of the occupant, thereby ensuring time for the occupant to visually recognize the information included in the image that has experienced the sense of discomfort. Is possible.

(3) In the first embodiment, the display state is the number of characters, and the process of changing the information amount of the image displayed on the display DP is the process of changing the number of characters included in the image. However, the present invention is not limited to this. Absent. That is, for example, as shown in FIG. 6, the process of changing the information amount of the image may be a process of changing the enlargement ratio of the map included in the navigation image. FIG. 6A is a diagram illustrating an image before the process of reducing the information amount (an image before the process). FIG. 6B is a diagram illustrating an image (processed image) obtained by performing a process of reducing the information amount on the image illustrated in FIG. 6A.
In this case, the information amount threshold α1 may be a preset map enlargement ratio, the number of icons displayed on the preset map, or the like.

(4) In the first embodiment, the configuration of the attention state acquisition unit 10B is configured to measure the caution state of the occupant using an electrocardiogram corresponding to the electroencephalogram detected by the electroencephalogram sensor 60, but is not limited thereto. Not what you want. That is, the configuration of the caution state acquisition unit 10B is detected from the occupant's line of sight from the occupant's face image captured by the camera 62, thereby estimating that the occupant's attention is directed to the screen of the display DP. It is good also as a structure which measures a state.
(5) In the first embodiment, when the display state of the image displayed on the display DP (the number of characters included in the image) is less than the information amount threshold α1, the information amount of the image displayed on the display DP is increased. However, the present invention is not limited to this. That is, when the display state of the image displayed on the display DP is less than the information amount threshold α1, the information amount of the image displayed on the display DP may be maintained.

(Second embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.
(Configuration of in-vehicle display device)
The configuration of the second embodiment will be described with reference to FIGS. 1 to 6 and FIG. In the drawings and the following description, the same components as those in the first embodiment described above are denoted by the same reference numerals. Moreover, in the following description, description may be abbreviate | omitted about the structure similar to 1st embodiment mentioned above.

As shown in FIG. 7, the in-vehicle display device 1 includes an ambient condition sensor 2, an operation state sensor 4, a biological information sensor 6, a display DP, a speaker SP, and a controller 10. Since the configuration other than the controller 10 is the same as that of the first embodiment described above, the description thereof is omitted.
The controller 10 includes a brain information acquisition unit 10A, a caution state acquisition unit 10B, a discomfort database 10C, a discomfort determination unit 10D, a display state acquisition unit 10E, a driving load detection unit 10H, and an image control unit 10G. Prepare. The configurations of the brain information acquisition unit 10A, the attention state acquisition unit 10B, and the discomfort database 10C are the same as those in the first embodiment described above.

  The uncomfortable feeling determination unit 10D receives input of a brain information signal, a caution state signal, and an output image signal. Then, the brain wave pattern included in the brain information signal is referenced at the timing of receiving the output image signal. Furthermore, the presence or absence of discomfort experienced by the occupant is determined by comparing the electroencephalogram pattern at the timing of receiving the output image signal with the electroencephalogram pattern stored in the discomfort database 10C. The discomfort determination unit 10D that has determined whether or not there is a discomfort outputs a discomfort determination signal to the driving load detection unit 10H and the image control unit 10G. Note that the timing of receiving the output image signal is, for example, an output image signal for the passenger to input a destination using the input device IF and to output a navigation image from the current location to the destination on the display DP. It is the timing of receiving the input.

The display state acquisition unit 10E acquires the display state of the image displayed on the display DP, and outputs a display state signal to the image control unit 10G.
The driving load detection unit 10H receives an input of the uncomfortable feeling determination result signal. And when the discomfort determination result signal includes a determination result that there is discomfort, the driving state of the vehicle by the occupant (driver) is acquired. Furthermore, the driving load which a passenger | crew (driver | operator) receives is detected using the acquired driving | running state. The driving load detection unit 10H that has detected the driving load outputs an information signal including the detected driving load (may be described as “driving load signal” in the following description) to the image control unit 10G.

The driving state by the occupant can be acquired using, for example, at least one of the steering angle of the steering wheel, the occupant's heart rate, and the occupant's brain wave.
When the driving load is detected using the steering angle of the steering, the steering angle included in the operation state signal, the steering entropy obtained by quantifying the steering fluctuation (for example, see Japanese Patent Application Laid-Open No. 11-227491), and the like are used. . In this case, the level of the driving load is detected using a steering entropy method for calculating the degree of instability of the driver from the smoothness of the steering operation (steering angle).

When the driving load is detected using the occupant's heart rate, the driving load is detected by referring to the heart rate included in the heart rate signal and by increasing or decreasing the heart rate. In this case, when the heart rate increases, it is detected that the driving load is high, and when the heart rate decreases, it is detected that the driving load is low.
When detecting the driving load using the occupant's brain wave, frequency analysis of the brain wave included in the brain wave signal is performed. Then, the higher the appearance frequency of the β wave, the more concentrated on driving, and it is detected that the driving load is high. On the other hand, the lower the appearance frequency of the β wave, the lower the necessity of concentrating on driving and detecting that the driving load is low.

In the second embodiment, as an example, the configuration of the driving load detector 10H stores a preset driving load threshold value α2, and the level of the driving load is determined by comparing the acquired driving state with the driving load threshold value α2. A case of detection will be described. Therefore, in the second embodiment, the driving load threshold value α2 is set to the steering angle entropy (see, for example, JP-A-11-227491), a preset heart rate, and a preset β wave appearance frequency. And according to the acquired driving | running state, the corresponding driving load threshold value (alpha) 2 is used.
The image control unit 10G receives the input of the uncomfortable feeling determination signal, the driving load signal, and the display state signal, and receives the command signal from the input device IF. Then, an output image signal is generated according to the uncomfortable feeling determination signal, the driving load signal, the display state signal, and the command signal, and the generated output image signal is output to the unnatural feeling determination unit 10D and the display DP. The configuration of the input device IF is the same as that of the first embodiment described above.

The output image signal is generated in the following procedure.
When the uncomfortable feeling determination result signal includes a determination result that there is no uncomfortable feeling, for example, an output image signal for displaying a navigation image or the like on the display DP is generated according to the command signal.
When the uncomfortable feeling determination result signal includes a determination result that there is uncomfortable feeling, an output image signal for controlling the information amount of the image displayed on the display DP is generated according to the driving load signal and the display state signal. . Specifically, when the driving load signal includes a determination result that the acquired driving load exceeds the driving load threshold α2, an output image signal that reduces the information amount of the image displayed on the display DP is generated. (See, eg, FIGS. 4A and 4B, FIGS. 6A and 6B). On the other hand, when the driving load signal includes a determination result that the acquired driving load is equal to or less than the driving load threshold α2, an output image signal that increases the information amount of the image displayed on the display DP is generated (for example, (See FIGS. 4A and 4B and FIGS. 6A and 6B).

(Processing performed by the in-vehicle display device 1)
An example of the display control process performed by the in-vehicle display device 1 will be described with reference to FIGS. 1 to 7 and FIG.
As shown in FIG. 8, when the display control process is started (START), first, the process of step S200 is performed. Since the processing from step S200 to step S204 is the same as the processing from step S100 to step S104 in the first embodiment described above, description thereof will be omitted.

In step S206, in order to acquire a parameter for detecting the driving load, the driving load detection unit 10H performs a process of acquiring the driving state of the vehicle by the driver ("Acquire driving state" shown in the figure). When the process of step S206 is performed, the display control process proceeds to step S208. In step S208, the operation load detection unit 10H determines whether or not the operation load detected using the operation state acquired in step S206 exceeds the operation load threshold α2 (“operation load> operation” shown in the figure). Load threshold α2 ").
If it is determined in step S208 that the driving load exceeds the driving load threshold value α2 (“Yes” shown in the figure), the display control process proceeds to step S210. On the other hand, if it is determined in step S208 that the driving load is equal to or less than the driving load threshold α2 (“No” shown in the figure), the display control process proceeds to step S212.

In step S210, the image control unit 10G performs a process of reducing the information amount of the image displayed on the display DP ("decrease information amount" shown in the figure) (for example, from the state of FIG. 4A to the state of FIG. 4B). To). Thereby, in step S210, it suppresses that the information provided to a passenger | crew becomes complicated. When the process of step S210 is performed, the display control process returns to the process of step S200 (RETURN).
In step S212, the image control unit 10G performs a process of increasing the information amount of the image displayed on the display DP ("increase the information amount" shown in the figure) (for example, from the state of FIG. 4B to the state of FIG. 4A). To). Thereby, in step S212, it is possible to improve convenience in obtaining information during driving. When the process of step S212 is performed, the display control process returns to the process of step S200 (RETURN).

(Operation)
With reference to FIGS. 1-8, an example of the operation | movement performed using the vehicle-mounted display apparatus 1 of 2nd embodiment is demonstrated.
When the vehicle is running, the brain wave of the occupant is measured by the brain wave sensor 60. In addition to this, when the vehicle travels, for example, a navigation image representing a travel route from the current location to the destination is displayed on the display DP in accordance with the operation of the input device IF by the occupant. At the timing when the navigation image is displayed on the display DP, the discomfort determination unit 10D determines whether or not the occupant feels discomfort with respect to the image displayed on the display DP.
When the uncomfortable feeling determination unit 10D determines that the occupant feels uncomfortable, the driving load detection unit 10H acquires the driving state of the vehicle by the driver, and further detects the driving load of the driver. In addition, it is determined whether or not the detected driving load exceeds the driving load threshold value α2.

  When the driving load detection unit 10H determines that the driving load exceeds the driving load threshold α2, the image control unit 10G reduces the information amount of the image displayed on the display DP (see FIGS. 4A and 4B). See). As a result, even when the driving load is high and the driving operation is busy, the information displayed on the display DP can be easily viewed. On the other hand, when the driving load detection unit 10H determines that the driving load is equal to or less than the driving load threshold α2, the image control unit 10G increases the information amount of the image displayed on the display DP (FIGS. 4A and 4B). (See). As a result, it is possible to improve convenience in obtaining information during driving in a situation where the driving load is low.

That is, in the vehicle-mounted display device 1 according to the second embodiment, the controller 10 determines whether or not the passenger feels uncomfortable from the brain activity detected by the electroencephalogram sensor 60 when an image is displayed on the display DP. If it is determined that there is a sense of incongruity, the image displayed on the display DP is changed according to the driving load received by the occupant.
As described above, in the in-vehicle display method implemented by the operation of the in-vehicle display device 1 according to the second embodiment, when it is determined that there is an uncomfortable feeling of the occupant when an image is displayed on the display DP, the driving received by the occupant The image displayed on the display DP is changed according to the load.

Further, in the in-vehicle display method of the second embodiment, when the information amount of the image displayed on the display DP is detected and it is determined that there is a sense of incongruity of the passenger at the timing when the image is displayed on the display DP, The image displayed on the display DP is changed.
The above-described second embodiment is an example of the present invention, and the present invention is not limited to the above-described second embodiment, and the present invention may be applied to other forms than this embodiment. Various modifications can be made according to the design or the like as long as they do not depart from the technical idea.

(Effect of the second embodiment)
If it is the vehicle-mounted display method using the vehicle-mounted display apparatus 1 of 1st embodiment, it will become possible to show the effect described below.
(1) When the information amount of the image displayed on the display DP is detected, and it is determined that the passenger feels uncomfortable at the timing when the image is displayed on the display DP, the information is displayed on the display DP according to the detected information amount. Change the image. As a result, if there is a possibility that the occupant is visually recognizing the image displayed on the display DP, it is displayed on the display DP according to the amount of information of the image displayed on the display DP. It is possible to change the image.

(2) The driving load received by the occupant (driver) is detected, and the image displayed on the display DP is changed according to the detected driving load. As a result, since the image displayed on the display DP is changed according to the visibility that changes depending on the driving load, it is possible to make the information displayed on the display DP easier to see and the convenience in obtaining information during driving. It becomes possible to improve the property.

(Modification of the second embodiment)
(1) In the second embodiment, the image displayed on the display DP is changed when it is determined that the passenger feels uncomfortable at the timing when the image is displayed on the display DP. However, the present invention is not limited to this. In other words, the image displayed on the display DP may be changed when it is determined that the passenger feels uncomfortable after a predetermined threshold time has elapsed since the image was displayed on the display DP.
In this case, if it is determined that there is a sense of incongruity of the occupant in a situation in which the occupant may be viewing the image displayed on the display DP until the threshold time has elapsed, the image displayed on the display DP is changed. It becomes possible to do. Note that changing the image displayed on the display DP includes erasing the image displayed on the display DP.

(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described with reference to the drawings.
(Configuration of in-vehicle display device)
The configuration of the third embodiment will be described with reference to FIGS. In the following description, the same components as those in the first embodiment described above are shown with the same reference numerals. Moreover, in the following description, description may be abbreviate | omitted about the structure similar to 1st embodiment mentioned above.
The in-vehicle display device 1 of the third embodiment is the same as that of the first embodiment described above except for the configuration of the image control unit 10G. For this reason, description of components other than the image control unit 10G is omitted.

  The image control unit 10G receives an input of an uncomfortable feeling determination signal, an information amount determination signal, and a command signal. Then, an output image signal is generated according to the unnaturalness determination signal, the information amount determination signal, and the command signal, and the generated output image signal is output to the display DP. In addition, the image control unit 10G can set parameters of brightness, saturation, hue, enlargement ratio, number of characters, and font size in several stages. In addition, the image control unit 10G displays the visibility of the image displayed on the display DP, the display state of the image displayed on the display DP, and the display on the display DP, regardless of the content of the image, according to the sense of incongruity determination signal. Adjust the display content of the displayed image.

  In the following description, the process for adjusting the visibility of an image may be referred to as a “visibility adjustment process”. In addition, the process for adjusting the display state of an image may be referred to as “display state adjustment process”. Further, the process of adjusting the display content of the image may be described as “display content adjustment process”.

(Visibility adjustment processing)
In the visibility adjustment process, first, the level of the brightness parameter is increased so as to become brighter than the current brightness value. When an input of an uncomfortable feeling determination result signal including a determination result that there is a sense of incongruity is received in a state where the brightness parameter level is raised, the brightness parameter is lowered so that the brightness parameter becomes darker than the current brightness value. When receiving a discomfort determination result signal including a determination result that there is a sense of incongruity in either a state where the brightness parameter level is raised or a state where the brightness parameter level is lowered, the brightness value is set to the initial state. Next, adjust the saturation.

  The saturation is first adjusted in the direction of increasing the vividness of the image. And, in the state where the saturation is adjusted in the direction to increase the vividness of the image, upon receiving an input of the uncomfortable determination result signal including the determination result that there is an uncomfortable feeling, the saturation is reduced in the direction of decreasing the vividness of the image Adjust to. Input the discomfort judgment result signal including the judgment result that there is a sense of incongruity whether the saturation is adjusted to increase the vividness of the image or the saturation is adjusted to decrease the vividness of the image. When receiving, the saturation is returned to the initial state, and then the hue is adjusted.

To adjust the hue, first, the image is adjusted in the direction of making the color warm. Then, in the state where the hue is adjusted in the direction in which the image is in the warm color system, upon receiving an input of the unnatural feeling determination result signal including the determination result that there is a sense of incongruity, the hue is adjusted in the direction in which the image is in the cold color system. When receiving a discomfort judgment result signal including a judgment result that there is a sense of incongruity in either a state in which the hue is adjusted in the direction to make the image warm, or a state in which the hue is adjusted in the direction to make the image cool The hue is returned to the initial state, and the visibility adjustment process is terminated.
In other words, even when the parameters of brightness, saturation, and hue are adjusted, it is determined that there is no sense of incongruity in the state where it is determined that there is a sense of incongruity of the occupant, and the visibility adjustment processing is terminated. The process proceeds to the display state adjustment process.

(Display state adjustment processing)
In the display state adjustment process, first, the enlargement ratio of the image is increased from the current enlargement ratio. When an uncomfortable feeling determination result signal including a determination result that there is a sense of incongruity is received in a state where the current enlargement ratio is increased, the enlargement ratio of the image is reduced from the current enlargement ratio. When receiving a discomfort judgment result signal including a judgment result that there is a sense of incongruity even when the enlargement ratio of the image is increased from the current enlargement ratio or the enlargement ratio of the image is reduced from the current enlargement ratio The image enlargement ratio is returned to the initial state, and then the number of characters is adjusted.

  The adjustment of the number of characters is first adjusted in the direction of decreasing the number of characters. When the input of a sense of incongruity determination result including a determination result that there is a sense of incongruity is received in a state where the saturation is adjusted in the direction of decreasing the number of characters, the number of characters is adjusted in the direction of increasing. If you receive a discomfort judgment result signal that includes the judgment result that there is a sense of incongruity, whether you are adjusting the direction to decrease the number of characters or adjusting the number of characters, return the number of characters to the initial state. Next, the font size is adjusted.

The font size is first adjusted in the direction of increasing the font size. Then, when an input of an uncomfortable feeling determination result signal including a result of determining that there is a sense of incongruity is received in a state where the font size is adjusted to increase, the font size is adjusted to decrease. Whether the font size is adjusted to a larger direction or the font size is adjusted to a smaller size, if you receive a discomfort judgment result signal that includes the judgment result that there is a sense of discomfort, change the font size to the initial state. The display state adjustment process is terminated.
That is, even when the parameters of the enlargement ratio, the number of characters, and the font size are adjusted, if it is determined that the passenger feels uncomfortable, it is determined that the display state is not uncomfortable, and the display state adjustment process is terminated. To display content adjustment processing.

(Display content adjustment processing)
In the display content adjustment process, first, the display content is adjusted by displaying an image acquired from a database (not shown) that stores the display content on the display DP. When displaying the image acquired from the database on the display DP, for example, generally popular displays are presented in order. Further, for example, by presenting images representing the contents of information classified for each category in order, information that does not feel uncomfortable may be determined and similar information may be presented. When an image obtained from the database is displayed on the display DP and an input of an uncomfortable feeling determination result signal including a result of determining that there is an uncomfortable feeling is received, the display of the image is stopped and the display content adjustment process is ended.

(Processing performed by the in-vehicle display device 1)
An example of display control processing performed by the in-vehicle display device 1 will be described with reference to FIGS. 1 to 8 and FIGS. 9 to 12.
As shown in FIG. 9, when the display control process is started (START), first, the process of step S300 is performed.
In step S300, in order to provide information required by the occupant, a process of displaying a navigation image or the like on the display DP ("display display" shown in the figure) is performed. When the process of step S100 is performed, the display control process proceeds to step S400. In step S400, in order to determine whether or not there is a sense of incongruity, the discomfort determination unit 10D determines whether or not the occupant feels a sense of discomfort with respect to the image displayed on the display DP ("display" shown in the figure). I feel uncomfortable inside ”).

If it is determined in step S400 that the occupant is feeling uncomfortable ("Yes" shown in the figure), the display control process proceeds to step S500. On the other hand, if it is determined in step S400 that the occupant does not feel uncomfortable ("No" shown in the figure), the display control process proceeds to step S300.
In step S500, the image control unit 10G performs visibility adjustment processing (“visibility adjustment processing” shown in the drawing). When the process of step S500 is performed, the display control process proceeds to step S600.

As shown in FIG. 10, when the visibility adjustment process is started (START), first, the process of step S510 is performed.
In step S510, in order to change the luminance of the image displayed on the display DP, processing for adjusting the luminance parameter ("luminance adjustment" shown in the figure) is performed. When it is determined that the occupant feels uncomfortable in the state where the process of step S510 is performed, the visibility adjustment process proceeds to step S520. In step S520, in order to change the saturation of the image displayed on the display DP, a process for adjusting the saturation parameter ("saturation adjustment" shown in the figure) is performed. When it is determined that the occupant has a sense of discomfort in the state where the process of step S520 is performed, the visibility adjustment process proceeds to step S530. In step S530, in order to change the hue of the image displayed on the display DP, a process for adjusting the hue parameter ("hue adjustment" shown in the drawing) is performed. When the process of step S530 is performed, the visibility adjustment process is ended (END).

In step S600, processing similar to that in step S400 ("discomfort during display" shown in the figure) is performed. If it is determined in step S600 that the occupant is feeling uncomfortable ("Yes" shown in the figure), the display control process proceeds to step S700. On the other hand, if it is determined in step S600 that the occupant does not feel uncomfortable ("No" shown in the figure), the display control process proceeds to step S300.
In step S700, the image control unit 10G performs display state adjustment processing (“display state adjustment processing” shown in the figure). When the process of step S700 is performed, the display control process proceeds to step S800.

As shown in FIG. 11, when the display state adjustment process is started (START), first, the process of step S710 is performed.
In step S710, in order to change the enlargement ratio of the image displayed on the display DP, a process of adjusting the enlargement ratio of the image (“enlargement ratio adjustment” shown in the figure) is performed. When it is determined that the occupant feels uncomfortable in the state where the process of step S710 is performed, the display state adjustment process proceeds to step S720. In step S720, in order to change the number of characters of the image displayed on the display DP, a process of adjusting the number of characters included in the image ("character number adjustment" shown in the figure) is performed. When it is determined that the occupant feels uncomfortable in the state where the process of step S720 is performed, the display state adjustment process proceeds to step S730. In step S730, in order to change the font size of the character included in the image displayed on the display DP, a process of adjusting the font size of the character included in the image ("font size adjustment" shown in the drawing) is performed. When the process of step S730 is performed, the display state adjustment process is ended (END).

In step S800, the same processing as in step S400 ("discomfort during display" shown in the figure) is performed. If it is determined in step S800 that the occupant is feeling uncomfortable ("Yes" shown in the figure), the display control process proceeds to step S900. On the other hand, when it is determined in step S800 that the occupant does not feel uncomfortable ("No" shown in the figure), the display control process proceeds to step S300.
In step S900, display content adjustment processing ("display content adjustment processing" shown in the figure) is performed by the image control unit 10G. When the process of step S900 is performed, the display control process returns to the process of step S300 (RETURN).

As shown in FIG. 12, when the display content adjustment process is started (START), first, the process of step S910 is performed.
In step S910, in order to provide a high-demand image, a process of displaying generally popular displays in order from the images acquired from the database on the display DP ("display popular images" shown in the figure). ")I do. When it is determined that the occupant feels uncomfortable in the state where the process of step S910 is performed, the display content adjustment process proceeds to step S920. In step S920, a process of stopping the display of the image on the display DP ("stop display" shown in the figure) is performed in order to eliminate the discomfort of the passenger. When the process of step S920 is performed, the display content adjustment process is ended (END).

(Operation)
With reference to FIGS. 1-12, an example of the operation | movement performed using the vehicle-mounted display apparatus 1 of 3rd embodiment is demonstrated.
When the vehicle is running, the brain wave of the occupant is measured by the brain wave sensor 60. In addition to this, when the vehicle travels, for example, a navigation image representing a travel route from the current location to the destination is displayed on the display DP in accordance with the operation of the input device IF by the occupant. In a state where the navigation image is displayed on the display DP, the uncomfortable feeling determination unit 10D determines whether or not the occupant feels uncomfortable with respect to the image displayed on the display DP.

When the uncomfortable feeling determination unit 10D determines that the occupant feels uncomfortable, the image control unit 10G performs the visibility adjustment process regardless of the content of the image. If it is determined that the occupant feels uncomfortable in the state in which the visibility adjustment processing is performed, the image control unit 10G performs the display state adjustment processing regardless of the content of the image. If it is determined that the passenger feels uncomfortable with the display state adjustment process being performed, the image control unit 10G performs the display content adjustment process regardless of the content of the image.
That is, in the in-vehicle display device 1 according to the third embodiment, the controller 10 determines whether or not the passenger feels uncomfortable from the brain activity detected by the electroencephalogram sensor 60 when an image is displayed on the display DP. If it is determined that there is a sense of incongruity, the image control unit 10G performs a visibility adjustment process, a display state adjustment process, and a display content adjustment process in accordance with the determination result of whether or not there is a sense of discomfort regardless of the content of the image. Do in order.

As described above, in the in-vehicle display method implemented by the operation of the in-vehicle display device 1 according to the third embodiment, when it is determined that the passenger feels uncomfortable, the visibility of the image displayed on the display DP is adjusted. If it is determined that the passenger feels uncomfortable after adjusting the visibility of the image, the display state of the image displayed on the display DP is adjusted. Further, if it is determined that the passenger feels uncomfortable after adjusting the display state of the image, the display content of the image displayed on the display DP is adjusted.
The above-described third embodiment is an example of the present invention, and the present invention is not limited to the above-described third embodiment, and the present invention is not limited to the above-described third embodiment. Various modifications can be made according to the design or the like as long as they do not depart from the technical idea.

(Effect of the third embodiment)
If it is a vehicle-mounted display method using the vehicle-mounted display device 1 of the third embodiment, the following effects can be achieved.
(1) If it is determined that the passenger feels uncomfortable when an image is displayed on the display DP, the visibility of the image displayed on the display DP is adjusted. If it is determined that the passenger feels uncomfortable after adjusting the visibility of the image, the display state of the image displayed on the display DP is adjusted. Further, if it is determined that the passenger feels uncomfortable after adjusting the display state of the image, the display content of the image displayed on the display DP is adjusted.

  For this reason, when it is determined that there is a sense of incongruity when the image is displayed on the display DP, the image is displayed on the display DP according to the determination result of whether or not there is a sense of incongruity regardless of the content of the image. The image can be adjusted according to the presence or absence of the passenger's discomfort. As a result, it is possible to reduce the sense of incongruity experienced by passengers by adjusting the visibility, display status, and display content in order for images in which the passenger feels uncomfortable, and suppress the deterioration in convenience. It is possible to provide an in-vehicle display method that can be performed.

(Modification of the third embodiment)
(1) In the third embodiment, the parameters of brightness, saturation, and hue are adjusted in the visibility adjustment process, but the present invention is not limited to this. That is, for example, when the configuration of the display DP is a configuration that can change the angle, the visibility adjustment processing may be performed using a device that can adjust the angle of the display DP. As an apparatus that can adjust the angle of the display DP, for example, as disclosed in Japanese Patent Laid-Open No. 7-319398, a configuration including a step motor or the like can be used.

  As described above, the present invention naturally includes various embodiments that are not described herein. Accordingly, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle-mounted display apparatus, 2 ... Ambient condition sensor, 4 ... Driving state sensor, 6 ... Biological information sensor, 8 ... Electrode, 10 ... Controller, 10A ... Brain information acquisition part, 10B ... Attention state acquisition part, 10C ... Discomfort Database, 10D ... Discomfort determination unit, 10E ... Display state acquisition unit, 10F ... Information amount determination unit, 10G ... Image control unit, 10H ... Driving load detection unit, 20 ... Map database, 22 ... GPS receiver 22 ... Communication device, 40 ... accelerator opening sensor, 42 ... brake switch, 44 ... steering operation sensor, 60 ... brain wave sensor, 62 ... camera, 64 ... heart rate sensor, DP ... display, SP ... speaker, IF ... input device

Claims (10)

Detecting the occupant's brain activity while displaying an image on a display that is visible to the occupant of the vehicle,
From the detected brain activity to determine the presence or absence of the passenger discomfort,
An on-vehicle display method characterized by changing an image displayed on the display when it is determined that the discomfort is present. Detecting the occupant's attention state;
The vehicle-mounted display method according to claim 1, wherein the presence or absence of the uncomfortable feeling is determined when the attention state with respect to the displayed image is detected. Detecting the amount of information in the image displayed on the display;
The in-vehicle display method according to claim 1 or 2, wherein when it is determined that there is a sense of incongruity, the displayed image is changed according to the detected amount of information. Detecting the driving load received by the passenger,
The in-vehicle display method according to any one of claims 1 to 3, wherein the displayed image is changed according to the detected driving load.   5. The method according to claim 1, wherein the displayed image is changed by changing at least one of visibility, display state, and display content of the displayed image. The on-vehicle display method described in item 1.   6. The method according to claim 1, wherein the image displayed is changed when it is determined that the user feels uncomfortable after a predetermined threshold time has elapsed since the image was displayed on the display. The on-vehicle display method described in item 1.   The timing for changing the displayed image is changed when it is determined that the discomfort is present at the time when the displayed image is changed. The in-vehicle display method described in 1. When it is determined that there is a sense of incongruity, the visibility of the displayed image is adjusted,
When it is determined that there is the uncomfortable feeling after adjusting the visibility, the display state of the displayed image is adjusted,
The in-vehicle display according to any one of claims 1 to 7, wherein when the display state is adjusted, the display content of the displayed image is adjusted when it is determined that the discomfort is present. Method. Accumulating the brain activity when it is determined that there is a sense of discomfort in the past,
The vehicle-mounted display according to any one of claims 1 to 8, wherein the presence or absence of the uncomfortable feeling is determined according to a comparison between the detected brain activity and the accumulated brain activity. Method. A sensor that detects the occupant's brain activity;
A display visible to the occupant;
A controller that determines whether or not the passenger feels uncomfortable from the brain activity detected by the sensor when an image is displayed on the display, and changes the displayed image when it is determined that the discomfort is present. A vehicle-mounted display device.

Images