JP7055559B2 - Head-up display device - Google Patents

Description

The present invention relates to a head-up display device.

A head-up display device is mounted on a vehicle such as an automobile (see, for example, Patent Document 1).

There are various types of head-up display devices, but they are equipped with a display device that can display driving information and a reflective member that can reflect driving information (display image) from the display device toward the front of the vehicle interior. Things exist.

In the head-up display device having such a configuration, the driving information from the display device is reflected toward the front of the vehicle interior by the reflecting member, so that a virtual image of the driving information is generated in front of the vehicle interior, and the front surface. It is possible to visually recognize the driving information without causing a large movement of the line of sight to the occupant who is driving facing. At this time, by providing a reflective member, it is possible to lengthen the optical path of the driving information from the display device and enlarge the driving information. Therefore, the driving information 3 can be displayed far away and has a large angle of view. It will be possible to make it.

When the head-up display device has a reflective member, a protective mechanism capable of protecting the reflective member is also provided.

This protection mechanism changes the angle of the reflective member between the display position where driving information can be displayed and the protection position where the display device can be protected from the incident (due to temperature rise) of external light (mainly sunlight, etc.). It is designed to do.

Then, by pointing the reflective member to the protective position, the external light that has entered the inside of the head-up display device is deflected (angle changed) so as not to illuminate the display device, so that the display device can be protected from the external light. can. Incidentally, when the reflecting member is a magnifying glass and there is no protection mechanism, the external light is condensed at a magnification corresponding to the magnifying magnification of the reflecting member and strongly illuminates the display device. When the reflective member is placed in the protected position, the display on the display device is stopped.

Japanese Unexamined Patent Publication No. 2017-218933

However, in the head-up display device described in Patent Document 1, once the reflective member reaches the protected position, it cannot be returned to the display position.

Therefore, the present invention mainly aims to solve the above-mentioned problems.

In order to solve the above problems, the present invention
A display device that can display driving information and
A reflective member that can reflect driving information from the display device toward the front of the passenger compartment, and
In a head-up display device provided with a protection mechanism capable of changing the angle of the reflective member between a display position capable of displaying driving information and a protection position capable of protecting the display device from the incident of external light.
The protection mechanism is a sensor for detecting external light that can detect external light, and
When the detection signal from the external light detection sensor exceeds a predetermined threshold value, the display device is provided with a control unit for stopping the display of the display device and setting the protection mode to retract the reflective member to the protected position.
The external light detection sensor is installed on the outer peripheral portion of the surface of the display device.
While the protection mode is set, the control unit temporarily returns the reflective member to the display position and detects external light with the external light detection sensor to determine whether or not the display can be restarted. It is characterized by having a display restart determination unit.

According to the present invention, the reflective member can be returned from the protected position to the display position by the above configuration.

It is a figure which shows the state which the head-up display device which concerns on this embodiment is mounted on a vehicle. It is a block diagram of the head-up display device of FIG. It is a figure which shows the state of changing the angle of the reflective member of FIG. It is a control system diagram of a head-up display device. It is a perspective view which shows the mounting state of the external light detection sensor (illuminance sensor or temperature sensor) provided in the outer peripheral part of the surface of a display device. It is a flowchart which shows the control for the protection mode by a control part. The incident amount of external light, the output (detection signal) of the external light detection sensor, the on / off control of the backlight, and the angle control of the reflective member to explain whether or not the display can be resumed by the display restart determination unit. , It is a time chart in which graphs showing the display state of the display device over time are arranged vertically.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.
1 to 7 are for explaining this embodiment.

<Structure> Hereinafter, the configuration of this embodiment will be described.

As shown in FIG. 1 (FIG. 2), a head-up display device 2 (HUD) that can be mounted on a vehicle 1 such as an automobile is provided. The directions are the vehicle front-rear direction X, the vehicle width direction Y, and the vertical direction Z with respect to the vehicle 1.

This head-up display device 2
Display device 4 capable of displaying operation information 3 and
It is assumed that the driving information 3 from the display device 4 is provided with a reflective member 6 capable of reflecting the driving information 3 toward the front of the vehicle interior 5.
Then, the angle of the reflective member 6 can be changed between the display position 7 capable of displaying the operation information 3 as shown in FIG. 3 and the protection position 9 capable of protecting the display device 4 from the incident of external light 8. The mechanism 11 is provided.

Here, the vehicle 1 such as an automobile is provided with a vehicle compartment 5 for the occupants to board. A front window glass 12 is provided in the front portion of the vehicle interior 5, and an interior panel such as an instrument panel 13 is installed below the front window glass 12. The head-up display device 2 can be installed inside the instrument panel 13. The instrument panel 13 is provided with an opening for passing the operation information 3.

The head-up display device 2 is a device that allows an occupant who is driving facing the front to visually recognize the driving information 3 without causing a large movement of the line of sight.

The head-up display device 2 has a main body casing 14 that houses the display device 4 and the reflective member 6 inside. The main body casing 14 is installed in the vehicle interior 5 (inside the instrument panel 13) with its width direction oriented substantially in the vehicle width direction Y. At the upper part of the instrument panel 13 and the main body casing 14, an opening that serves as an exit portion of the driving information 3 into the vehicle interior 5 is provided. A transparent dustproof cover 15 can be attached to this opening. The dustproof cover 15 may be flat, but in order to prevent the dustproof cover 15 from being reflected on the front window glass 12, it has a concave shape that is recessed downward when viewed from the side. A control board 16 can be installed inside the main body casing 14.

The driving information 3 is general information that supports driving. The driving information 3 includes, for example, speed information, road information (for example, lane display, preceding vehicle display, oncoming vehicle display, pedestrian display, obstacle display, etc.), course information (for example, intersection information, etc.). Right / left turn display, etc.), destination information (for example, arrival time, mileage to the destination, etc.), traffic jam information, service information (for example, parking lot information, gas station information, surrounding facility information), etc. , Other indications, etc.

As the display device 4, a liquid crystal panel 4a, an organic EL panel, or the like can be used. Further, a projector using a DLP unit or the like can also be used. The display device 4 is said to have a rectangular display surface or the like. In the case of the liquid crystal panel 4a, the backlight 17 is provided on the back surface side. The backlight 17 is said to have an LED 17b as a light source, a heat sink 17c, or the like installed on the back surface side of a tubular reflector 17a. A liquid crystal panel 4a is installed on the surface side of the reflector 17a. The liquid crystal panel 4a is connected to the control board 16 via a cable 18 (for example, a flexible printed circuit board or the like) and a connector 18a.

The reflecting member 6 is a reflecting mirror. A plane mirror or a curved mirror can be used as the reflector. In this embodiment, the first reflecting mirror 6a and the second reflecting mirror 6b are provided in order from the side closer to the display device 4 (in the optical path) inside the main body casing 14, and the first reflecting mirror 6a is ( The plane mirror (infrared transmission type) and the second reflecting mirror 6b are curved mirrors (concave mirror or magnifying mirror).

Then, the first reflector 6a is installed at the position on the rear side (rear side of the vehicle) of the main body casing 14, and the second reflector 6b is installed at the position on the front side (front side of the vehicle) of the main body casing 14. An optical path for operation information 3 is formed in the main body casing 14. The number and arrangement of the reflective members 6 are not limited to the above.

In this embodiment, the first reflecting mirror 6a is fixed, and the angle of the second reflecting mirror 6b can be changed by the angle changing mechanism 21 as described later.

The second reflecting mirror 6b is rotatably attached to the rotating shaft 22 so that the angle can be changed by rotation about the rotating shaft 22. The angle changing mechanism 21 is the output shaft of the drive motor 23. It is provided with a drive gear 24 attached to the drive gear 24 and a driven gear 25 for transmitting the driving force of the drive gear 24 to the rotary shaft 22.

The rotating shaft 22 is supposed to extend substantially horizontally in the width direction of the main body casing 14. As a result, the reflecting member 6 (second reflecting mirror 6b) can be rotated in the vehicle front-rear direction X and the vertical direction Z.

The angle of the second reflecting mirror 6b can be changed between the display position 7 and the protection position 9, but the display position 7 transmits the driving information 3 reflected by the first reflecting mirror 6a to the vehicle through the dustproof cover 15. It is the direction of reflection toward the inside of the room 5. A reflecting portion 27 (FIG. 1) is provided in the vehicle interior 5 to reflect the driving information 3 reflected in the vehicle interior 5 toward the occupant in the driver's seat. The reflective portion 27 may be the front window glass 12 of the vehicle 1, or may be a dedicated reflector (combiner). The front window glass 12 becomes a reflecting portion 27 by performing a reflection process (for example, providing a fine reflecting surface or providing a reflecting film). The driving information 3 reflected by the reflecting unit 27 is imaged as a virtual image 28 (FIG. 1) at a position in front of the reflecting unit 27, and the occupant in the driver's seat is superimposed on the external landscape seen through the front window glass 12. The virtual image 28 of the driving information 3 can be visually recognized.

The protection position 9 is a position for preventing the external light 8 from entering the inside of the main body casing 14 from the dustproof cover 15 in the opposite direction and being reflected by the reflecting member 6 to prevent the external light 8 from reaching the display device 4. The reflecting member 6 (second reflecting mirror 6b) is moved to the protection position 9 as necessary while the head-up display device 2 is in use. An absorbent material or the like for absorbing the external light 8 reflected by the reflective member 6 at the protection position 9 may be provided inside the main body casing 14.

In contrast to the above basic configuration, this embodiment is provided with the following configuration.

(1) As shown in FIG. 4, the protection mechanism 11 includes an external light detection sensor 31 capable of detecting external light 8 and an external light detection sensor 31.
When the detection signal 32 from the external light detection sensor 31 exceeds a predetermined threshold value 33, the display of the display device 4 is stopped, and the control unit 34 is set to the protection mode in which the reflection member 6 is retracted to the protection position 9. It is equipped with.
The external light detection sensor 31 is installed on the outer peripheral portion 35 of the surface of the display device 4.
While the protection mode is set, the control unit 34 temporarily returns the reflective member 6 to the display position 7 and detects the external light 8 with the external light detection sensor 31 to determine whether or not the display can be restarted. The display restart determination unit 61 for performing is provided.

Here, the external light detection sensor 31 is a sensor for detecting the external light 8, and may be any sensor as long as it can detect the external light 8. The external light detection sensor 31 can be provided as an auxiliary to, for example, the position of the opening of the main body casing 14, in addition to the one installed on the outer peripheral portion 35 of the surface of the display device 4 (FIG. 2). ..

The detection signal 32 may differ depending on the type of the external light detection sensor 31 to be used, but can be converted into data indicating the incident amount of the external light 8 and used as needed.

The threshold value 33 is determined as the intensity of the external light 8 that does not affect the display device 4. The threshold value 33 is specifically set for each head-up display device 2 according to the configuration of the display device 4 and the reflective member 6. The threshold value 33 can be set in advance and stored in a storage unit 38 such as a memory. As the storage unit 38, one mounted on the control board 16 or the like can be used.

The surface of the display device 4 is a display surface of the display device 4, a surface of a frame member provided on the outer periphery of the display device 4, and the like.

The outer peripheral portion 35 is a portion outside the effective display range 39 (FIG. 5) on the display surface of the display device 4, a frame member of the display device 4, and the like.

The control unit 34 can be provided in the control circuit mounted on the control board 16 in terms of hardware or software. For the control circuit, for example, a computer such as a one-chip microcomputer can be used. The control unit 34 can send commands to the display device 4 (liquid crystal panel 4a), the backlight 17, the angle changing mechanism 21 (drive motor 23), and the like to control them. The storage unit 38 can also be set in a memory built in a one-chip microcomputer constituting a control circuit.

Then, the control unit 34 sets the reflective member 6 into a protection mode or the like according to a process as described in the flowchart of FIG. 6, for example.

That is, almost at the same time as starting to use the head-up display device 2, in step 1, the incident amount of the external light 8 is detected by the output (detection signal 32) of the external light detection sensor 31. Then, the process proceeds to step 2.

In step 2, it is determined whether or not the screen of the display device 4 is exposed to the external light 8.

If it is determined in step 2 that the external light 8 is not shining, the process proceeds to step 3, and the display device 4 is set to the normal display in step 3.

If it is determined in step 2 that the external light 8 is shining (with an intensity exceeding the threshold value 33), the process proceeds to step 4, and in step 4, "the HUD may exceed the guaranteed temperature, so it is forced. The guidance for the stop of the display such as "Temporarily stop the display is temporarily stopped." Is output to the display device 4 of the head-up display device 2 (HUD) or the instrument device (meter display) mounted on the vehicle 1. .. Then, the process proceeds to step 5.

In step 5, the display signal to the display device 4 is changed from operation (display) to stop (non-display), and the backlight 17 is turned off from on. Then, the process proceeds to step 6.

In step 6, the angle of the mirror (reflecting member 6 (particularly, the second reflecting mirror 6b)) is rotated from the display position 7 to the protection position 9. The above is the process for entering the protected mode.

After that, the process proceeds to step 7, and the display restart determination unit 61 provided in the control unit 34 causes the reflection member 6 to perform the restart detection operation, and also determines whether or not the display can be restarted.

The display restart determination unit 61 can be provided in the control circuit mounted on the control board 16 in terms of hardware or software.

First, in step 7, the restart detection operation is performed after a predetermined time (h time) has elapsed since the reflective member 6 was set to the protection position 9. In the restart detection operation, the angle of the reflective member 6 is changed from the protection position 9 to the display position 7 for a short time (determined so that the display device 4 is not damaged) at predetermined time intervals. Then, the process proceeds to step 8.

In step 8, the incident amount of the external light 8 is detected by the output of the external light detection sensor 31, and it is determined whether or not the external light 8 hits the screen of the display device 4.

If it is determined in step 8 that the external light 8 is not shining, the process proceeds to step 9 while keeping the angle of the reflective member 6 at the display position 7, and the display signal to the display device 4 is activated from the stop in step 9. At the same time, the backlight 17 is turned from off to on, and the process proceeds to step 3 to set the display device 4 to the normal display (display restart).

If it is determined in step 8 that the external light 8 is shining, the process returns to step 6 (continuation of the protection mode). After that, the above is repeated.

Then, the display restart determination unit 61 determines whether or not the display can be restarted as follows while the reflection member 6 is performing the restart detection operation.

FIG. 7 shows the incident amount of the external light 8 and the output of the sensor (detection signal 32 of the external light detection sensor 31) and the (on / off) control of the backlight 17 for showing the state of determining whether or not the display can be restarted. It is a time chart in which graphs showing the (angle) control of the reflective member 6 and the display state (of the display device 4) over time are arranged vertically.

First, for example, the incident amount of the external light 8 starts to increase immediately before the time (2) from a weak state like the time (1), peaks after the time (3), and reaches the peak at the time (6). It is assumed that the weak state starts to fall from the peak, returns to the weak state in time (8), and changes so that the weak state continues as it is.

In this case, in the time (1), since the output of the external light detection sensor 31 is sufficiently smaller than the threshold value 33, the display of the display device 4 is turned on.

At time (2), the incident amount of the external light 8 (or the illuminance of sunlight) has increased, but the detection signal 32 of the external light detection sensor 31 is still smaller than the threshold value 33. Therefore, the brightness of the backlight 17 is increased according to the incident amount of the external light 8.

In the time (3), the detection signal 32 of the external light detection sensor 31 exceeds the threshold value 33. Therefore, the backlight 17 is turned off, the reflective member 6 is rotated to the protection position 9, and the protection mode is started. Before entering the protection mode, the display device 4 or the like may convey a message to the effect that "the protection mode is entered" to the occupant.

While the output of the external light detection sensor 31 exceeds the threshold value 33 as in the time (4) to (8), after the time (4) when the predetermined time (h time) has elapsed from the time (3), The reflection member 6 is temporarily rotated to the display position 7 at predetermined time intervals, and the detection signal 32 of the external light detection sensor 31 is confirmed. When the detection signal 32 of the external light detection sensor 31 is equal to or higher than the threshold value 33, the reflective member 6 is returned to the protected position 9. The predetermined time (h hours) and the predetermined time interval described above can be arbitrarily determined.

During this period, the backlight 17 is turned off and the display device 4 is in the non-display state, so that the occupant does not notice the rotation of the reflective member 6. Further, since the measurement by the external light detection sensor 31 performed by rotating the reflective member 6 to the display position 7 is performed in a sufficiently short time (for example, several tens of ms or less), the temperature rise of the display device 4 due to the external light 8 does not occur. It is small and there is no risk of damaging the display device 4.

The restart detection operation may be performed at regular time intervals, for example, at time intervals of time (4) to (8) (or until the first time (9) when the threshold value is 33 or less). Or, it may be performed at a time interval other than the above. For example, when the actual incident amount of the external light 8 on the display position 7 is sufficiently larger than the threshold value 33, the time interval is lengthened, and as the actual incident amount of the external light 8 on the display position 7 becomes closer to the threshold value 33, the time interval is lengthened. The time interval may be shortened (stepwise or steplessly).

In addition to the above, the time interval for the restart detection operation may be determined by referring to external information such as the position of the vehicle 1 and the current time.

Then, since the output of the external light detection sensor 31 becomes the threshold value 33 or less in the time (9), the protection mode is terminated and the reflection member 6 is rotated to the display position 7. Then, the backlight 17 is turned on and the display of the display device 4 is restarted. Before exiting the protection mode and resuming the display, the display device 4 may convey a message to the effect of "resuming the display" to the occupant.

(2) Further, the external light detection sensor 31 detects at least two or more positions separated from the outer peripheral portion 35 of the surface of the display device 4 in the opposite side direction 36 or the diagonal direction 37 (for example, FIG. 5). It may be installed so that it can be prepared.

Here, the opposite side direction 36 is a direction connecting any one of the two sets of opposite sides on the rectangular display surface of the display device 4.

The diagonal direction 37 is a direction connecting any of two sets of opposite corners on the rectangular display surface of the display device 4.

The detection of two or more positions may be performed by one external light detection sensor 31 or by a plurality of external light detection sensors 31.

(3) As shown in FIG. 5, the external light detection sensor 31 may be at least one of the illuminance sensor 41 and the temperature sensor 42.

Here, the illuminance sensor 41 detects the amount of incident light 8 on the surface of the display device 4 by measuring the illuminance of the light on the surface of the display device 4. The illuminance measured by the illuminance sensor 41 can be directly used as the incident amount of the external light 8.

The temperature sensor 42 detects the amount of incident light 8 on the surface of the display device 4 by measuring the temperature of the surface of the display device 4. The temperature measured by the temperature sensor 42 can be converted into the incident amount of the external light 8 by using a conversion formula or the like set in advance.

Since each of the illuminance sensor 41 and the temperature sensor 42 detects one place, at least two or more are used. The illuminance sensor 41 and the temperature sensor 42 can be appropriately provided at the positions of the intermediate portions and the end portions (corner portions) of the sides constituting the outer peripheral portion 35 of the display device 4. The plurality of external light detection sensors 31 may be attached to any of the four sides or the four corners of the display device 4 as long as there is at least one set of sensors separated in the opposite side direction 36 or the diagonal direction 37. ..

For example, two illuminance sensors 41 and a temperature sensor 42 may be provided at both ends of one side constituting the outer peripheral portion 35 of the display device 4 (separated from each other in the opposite side direction 36). Further, for example, the two illuminance sensors 41 and the temperature sensor 42 may be provided in the middle portion of the opposite sides constituting the outer peripheral portion 35 of the display device 4 (separated from each other in the opposite side direction 36). However, as in this embodiment, it is most preferable to provide the external light detection sensor 31 at each of the four corners of the display device 4 for detection.

It is preferable to use only one of the illuminance sensor 41 and the temperature sensor 42, but it is also possible to use them in combination.

<Action> The action of this example will be described below.

The head-up display device 2 reflects the driving information 3 (display image) from the display device 4 toward the front of the vehicle interior 5 by the reflecting member 6, so that the virtual image 28 of the driving information 3 is reflected in front of the vehicle interior 5. The driving information 3 can be visually recognized without causing a large movement of the line of sight to the occupant who is driving facing the front.

At this time, by providing the reflective member 6, it is possible to lengthen the optical path of the operation information 3 from the display device 4 (so that the image formation position is far away) and to enlarge the operation information 3. Therefore, it becomes possible to display the driving information 3 in a distant place and to increase the angle of view. As described above, the reflective member 6 has an important configuration for displaying the operation information 3 at a distance and increasing the angle of view.

The head-up display device 2 having the reflective member 6 is provided with a protection mechanism 11, and the protection mechanism 11 protects the display device 4 from a temperature rise due to the incident of external light 8 (mainly sunlight or the like). I have to. The protection mechanism 11 controls the display device 4 (the liquid crystal panel 4a of the liquid crystal panel 4a) and the backlight 17, or operates the angle changing mechanism 21 to operate the reflecting member 6 (in this embodiment, the second reflecting mirror 6b). It is assumed that the angle of the display device 4 is changed between the display position 7 capable of displaying the information 3 and the protection position 9 capable of protecting the display device 4 against the incident of the external light 8.

By directing the reflective member 6 toward the protection position 9, the external light 8 that has entered the inside of the head-up display device 2 is deflected so as not to illuminate the display device 4, so that the display device 4 is protected from the external light 8. Can be done. By the way, when the reflecting member 6 (second reflecting mirror 6b) is a magnifying glass and there is no protection mechanism 11, the external light 8 is condensed and displayed at a magnification corresponding to the magnifying magnification of the reflecting member 6. It will illuminate the device 4 strongly. When the reflective member 6 is set to the protection position 9, the display of the display device 4 is stopped, and the temperature of the display device 4 can be lowered by stopping the display.

Then, the protection mechanism 11 includes the external light detection sensor 31 and the control unit 34, so that the control unit 34 receives when the detection signal 32 from the external light detection sensor 31 exceeds a predetermined threshold value 33. It is possible to stop the display of the display device 4 and automatically switch to the protection mode in which the reflection member 6 is retracted to the protection position 9.

At this time, for example, the external light detection sensor 31 is provided only at the position of the opening (emission portion) of the main body of the head-up display device 2 (which is the farthest from the display device 4 in terms of optical path). Since the external light detection sensor 31 provided at one location of the opening detects the external light 8 from various directions, the actual external light with respect to the display device 4 installed inside the main body casing 14 Since the incident amount of 8 cannot be directly detected, it becomes difficult to obtain a correct detection result.

For example, when the external light 8 entering the inside of the main body casing 14 locally hits the surface (display surface) of the display device 4, the detection result will be different from the actual one. Further, the external light 8 entering the inside of the main body casing 14 changes variously depending on the position of the sun, the direction of the vehicle 1, changes in the weather, etc., but only the external light detection sensor 31 is provided in the opening. Therefore, it is not possible to cope with such a change in the external light 8 entering the inside of the main body casing 14. If the correct detection result is not obtained, the display device 4 may not be effectively protected.

<Effect> According to this embodiment, the following effects can be obtained.

(Effect 1) About the external light detection sensor 31 and the display restart determination unit 61, etc.

The external light detection sensor 31 is provided on the outer peripheral portion 35 of the surface of the display device 4 (for example, a portion outside the effective display range 39 on the display surface of the display device 4, a frame member provided on the display device 4, or the like). I did it. As a result, the actual incident amount of the external light 8 entering the inside of the main body casing 14 to the display device 4 can be accurately detected, and the protection mode can be set at the optimum time.

Then, the control unit 34 is provided with a display restart determination unit 61. The display restart determination unit 61 performs a restart detection operation for temporarily returning the reflective member 6 from the protection position 9 to the display position 7 in the protection mode, and outside the actual incident amount of the external light 8 on the display position 7. By directly detecting with the light detection sensor 31, it is determined whether or not the display can be restarted.

In this way, it is possible to accurately determine whether or not the display can be restarted by performing the propriety determination based on the detection result of the actual incident amount of the external light 8 on the display device 4.

On the other hand, for example, when the incident amount of the external light 8 is detected only by the external light detection sensor 31 provided at the position of the opening of the main body casing 14, the actual external light for the display device 4 is detected. Since the incident amount of 8 cannot be detected, it is difficult to accurately determine whether or not the display can be restarted.

Then, the display restart determination unit 61 displays the reflective member 6 from the protection position 9 when the incident amount of the external light 8 detected by the external light detection sensor 31 attached to the surface of the display device 4 falls below the threshold value 33. Return to 7 and restart the display by the display device 4.

As described above, the display interruption time in the protection mode can be further shortened while reliably protecting the display device 4.

It should be noted that the display is not performed during the restart detection operation. Further, since the restart detection operation is to return the reflective member 6 to the display position 7 for a moment (a short time required to detect the incident amount of the external light 8) by the external light detection sensor 31, it is restarted. During the detection operation, the display device 4 is not affected by the incident light of the outside light 8.

(Effect 2) Installation of sensor 31 for detecting external light

The external light detection sensor 31 may be provided so as to be capable of detecting at least two or more positions separated from the outer peripheral portion 35 of the surface of the display device 4 in the opposite side direction 36 or the diagonal direction 37. As a result, the outer peripheral portion 35 on the surface of the display device 4 can be detected in a wide range, so that it is possible to cope with changes in the external light 8 that has entered the inside of the main body casing 14.

Therefore, regardless of the change in the external light 8, the actual incident amount of the external light 8 can be correctly detected, and the timing for switching to the protection mode can be accurately determined. Thereby, the display device 4 can be more effectively and surely protected.

(Effect 3) About the illuminance sensor 41 or the temperature sensor 42

The external light detection sensor 31 may be at least one of an illuminance sensor 41 and a temperature sensor 42. As a result, the external light detection sensor 31 is installed at at least two or more positions on the outer peripheral portion 35 of the surface of the display device 4 apart from each other in the opposite side direction 36 or the diagonal direction 37, and the illuminance, temperature, amount of light, etc. are measured. It can be directly measured and suitable for obtaining the actual incident amount of the external light 8 on the display device 4.

At this time, the control is simplified by using the external light detection sensor 31 to directly detect the incident amount of the external light 8 like the illuminance sensor 41.

Further, by setting the external light detection sensor 31 as the temperature sensor 42, the surface temperature of the outer peripheral portion 35 of the surface of the display device 4 can be detected and used as the incident amount of the external light 8.

2 Head-up display device 3 Operation information 4 Display device 5 Vehicle interior 6 Reflective member 7 Display position 8 External light 9 Protective position 11 Protection mechanism 31 External light detection sensor 32 Detection signal 33 Threshold 34 Control unit 35 Outer circumference 36 Opposite side direction 37 Diagonal direction 41 Illuminance sensor 42 Temperature sensor 61 Display restart judgment unit

Claims (3)

A display device that can display driving information and
A reflective member that can reflect driving information from the display device toward the front of the passenger compartment, and
In a head-up display device provided with a protection mechanism capable of changing the angle of the reflective member between a display position capable of displaying driving information and a protection position capable of protecting the display device from the incident of external light.
The protection mechanism is a sensor for detecting external light that can detect external light, and
When the detection signal from the external light detection sensor exceeds a predetermined threshold value, the display device is provided with a control unit for stopping the display of the display device and setting the protection mode to retract the reflective member to the protected position.
The external light detection sensor is installed on the outer peripheral portion of the surface of the display device.
While the protection mode is set, the control unit temporarily returns the reflective member to the display position and detects external light with the external light detection sensor to determine whether or not the display can be restarted. A head-up display device characterized by having a display restart determination unit. In the head-up display device according to claim 1,
The head-up display is characterized in that the external light detection sensor is provided so as to be able to detect at least two or more positions separated from each other in the diagonal direction or the diagonal direction with respect to the outer peripheral portion of the surface of the display device. Device. In the head-up display device according to claim 1 or 2.
A head-up display device, wherein the external light detection sensor is at least one of an illuminance sensor and a temperature sensor.

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