JP2019163006A - Head-up display device - Google Patents

Abstract

To mainly enable a reflection member to return to a display position from a protection position.SOLUTION: A head-up display device 2 includes: a display device 4; a reflection member 6 which can reflect operation information 3 from the display device 4 toward the front of a cabin 5; and a protection mechanism 11 for enabling the reflection member 6 to perform angle change between a display position 7 and a protection position 9. The protection mechanism 11 includes: a sensor 31 for external light detection; and a control part 34 for stopping a display of the display device 4 and performing a protection mode for retracting the reflection member 6 to the protection position 9 when a detection signal 32 from the sensor 31 for external light detection exceeds a threshold 33. The sensor 31 for external light detection is installed on a periphery part 35 of the surface of the display device 4. The control part 34 is provided with a display resumption determination part 61 for determining whether or not to resume the display by temporarily returning the reflection member 6 to the display position 7 and detecting external light 8 with the sensor 31 for external light detection during the protection mode.SELECTED DRAWING: Figure 7

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 (for example, see Patent Document 1).

  There are various types of head-up display devices, and a display device capable of displaying driving information and a reflecting member capable of reflecting driving information (display image) from the display device toward the front of the passenger compartment are provided. 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 passenger compartment by the reflecting member, thereby generating a virtual image of the driving information in front of the passenger compartment. Driving information can be visually recognized without causing a large line-of-sight movement to the occupant driving the vehicle. At this time, by providing the reflecting member, it becomes possible to lengthen the optical path of the driving information from the display device or to enlarge the driving information. It becomes possible to plan.

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

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

  Then, by directing the reflecting member to the protection position, the external light entering 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 external light. it can. Incidentally, when the reflecting member is a magnifying mirror, if there is no protection mechanism, outside light is condensed at a magnification corresponding to the magnification of the reflecting member and strongly illuminates the display device. When the reflecting member is set to the protection position, the display of the display device is stopped.

JP 2017-218933 A

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

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

In order to solve the above problems, the present invention provides:
A display device capable of displaying driving information;
A reflective member capable of reflecting driving information from the display device toward the front of the passenger compartment;
In the head-up display device provided with a protection mechanism capable of changing the angle between a display position where the operation information can be displayed and a protection position where the display device can be protected from the incidence of external light.
The protection mechanism is an external light detection sensor capable of detecting external light;
When a detection signal from the outside light detection sensor exceeds a predetermined threshold, the display unit is stopped, and a control unit is set in a protection mode for retracting the reflecting member to a protection position.
The outside light detection sensor is installed on the outer periphery of the surface of the display device,
While the control mode is in the protection mode, the control unit temporarily returns the reflecting member to the display position and detects external light by the external light detection sensor, thereby determining whether or not display can be resumed. A display resumption determining unit is provided.

  According to the present invention, the reflecting member can be returned from the protection position to the display position by the above-described configuration.

It is a figure which shows the state which mounted the head-up display apparatus concerning this Embodiment with respect to a vehicle. It is a block diagram of the head-up display apparatus of FIG. It is a figure which shows the state of the angle change of the reflection member of FIG. It is a control system diagram of a head-up display device. It is a perspective view which shows the attachment state of the external light detection sensor (illuminance sensor or temperature sensor) provided in the outer peripheral part of the surface of a display apparatus. It is a flowchart which shows the control for protection modes by a control part. In order to explain whether or not display resumption can be resumed by the display resumption judgment unit, the amount of incident external light, the output (detection signal) of the sensor for detecting external light, the on / off control of the backlight, and the angle control of the reflecting member, 5 is a time chart in which graphs representing 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.

  <Configuration> The configuration of this embodiment will be described below.

  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. In addition, about a direction, it is set as the vehicle front-back direction X, the vehicle width direction Y, and the up-down direction Z on the basis of the vehicle 1.

This head-up display device 2 is
A display device 4 capable of displaying the driving information 3;
It is assumed that a reflection member 6 capable of reflecting the driving information 3 from the display device 4 toward the front of the passenger compartment 5 is provided.
Then, the reflection member 6 can be changed in angle between a display position 7 that can display the operation information 3 as shown in FIG. 3 and a protection position 9 that can protect the display device 4 from the incidence of external light 8. A mechanism 11 is provided.

  Here, the vehicle 1 such as an automobile is provided with a passenger compartment 5 for a passenger to board. A front window glass 12 is provided at the front of the passenger compartment 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 driving information 3 to be visually recognized without causing a large line-of-sight movement to a passenger driving facing the front.

  The head-up display device 2 includes a main body casing 14 that houses the display device 4 and the reflection member 6 therein. The main body casing 14 is installed in the passenger compartment 5 (inside the instrument panel 13) with its width direction substantially directed in the vehicle width direction Y. In the upper part of the instrument panel 13 and the main body casing 14, an opening serving as a part for emitting the operation information 3 into the passenger compartment 5 is provided. A transparent dustproof cover 15 can be attached to the opening. The dust-proof cover 15 may be flat, but in order to prevent the dust-proof cover 15 from being reflected on the front window glass 12, the dust-proof cover 15 has a concave shape that is recessed downward as viewed from the side. A control board 16 can be installed inside the main casing 14.

  Driving information 3 is general information for driving assistance. 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.), route information (for example, intersection information, Left and right turn display), destination information (for example, arrival time and mileage to the destination), traffic information, service information (for example, parking lot information, gas station information, neighboring facility information), And other indications.

  As the display device 4, a liquid crystal panel 4a, an organic EL panel, or the like can be used. Also, a projector using a DLP unit can be used. The display device 4 has a rectangular display surface. In the case of the liquid crystal panel 4a, a backlight 17 is provided on the back side. The backlight 17 is configured such that an LED 17b or a heat sink 17c serving as a light source is installed on the back side of a cylindrical 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 board) and a connector 18a.

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

  And the 1st reflective mirror 6a is installed in the position of the rear side (vehicle back side) of main part casing 14, and the 2nd reflective mirror 6b is installed in the position of the front side (vehicle front side) of main part casing 14, An optical path of the operation information 3 is formed in the main body casing 14. The number and arrangement of the reflecting 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 will be described later.

  The second reflecting mirror 6b is attached so as to be rotatable integrally with the rotating shaft 22 so that the angle is changed by turning around the rotating shaft 22, and the angle changing mechanism 21 is an output shaft of the drive motor 23. And a driven gear 25 that transmits the driving force of the driving gear 24 to the rotary shaft 22.

  The rotating shaft 22 extends substantially horizontally in the width direction of the main casing 14. Thus, the reflecting member 6 (second reflecting mirror 6b) can be rotated in the vehicle longitudinal 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 is configured to drive the driving information 3 reflected by the first reflecting mirror 6a through the dust cover 15. This is the direction of reflection toward the inside of the chamber 5. In the passenger compartment 5, there is provided a reflecting portion 27 (FIG. 1) that reflects the driving information 3 reflected in the passenger compartment 5 toward the passenger in the driver's seat. The reflector 27 can be the front window glass 12 of the vehicle 1 or a dedicated reflector (combiner). The front window glass 12 becomes the reflection portion 27 by performing a reflection process (for example, providing a fine reflection surface or a reflection 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 driver's seat occupant is superimposed on an external scenery visible 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 interior of the main body casing 14 from the dust cover 15 and being reflected by the reflecting member 6 to reach the display device 4. The reflecting member 6 (second reflecting mirror 6b) is moved to the protection position 9 as necessary during use of the head-up display device 2. Inside the main casing 14, an absorbing material or the like for absorbing the external light 8 reflected by the reflecting member 6 at the protection position 9 may be provided.

  In contrast to the basic configuration as described above, this embodiment has the following configuration.

(1) As shown in FIG. 4, the protection mechanism 11 includes an external light detection sensor 31 that can detect the external light 8, and
When the detection signal 32 from the sensor 31 for detecting outside light exceeds a predetermined threshold value 33, the control unit 34 enters a protection mode in which the display of the display device 4 is stopped and the reflecting member 6 is retracted to the protection position 9. It has.
The sensor 31 for detecting outside light is installed on the outer peripheral portion 35 on the surface of the display device 4.
While in the protection mode, the control unit 34 temporarily returns the reflecting 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 to restart the display. A display resumption determining unit 61 is provided.

  Here, the external light detection sensor 31 is a sensor for detecting the external light 8, and any sensor can be used as long as the external light 8 can be detected. The outside light detection sensor 31 can be provided in an auxiliary manner with respect to the position of the opening of the main casing 14, for example, separately from the one installed on the outer peripheral portion 35 on the surface of the display device 4 (FIG. 2). .

  The detection signal 32 may be different 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 as necessary.

  The threshold 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 determined for each head-up display device 2 according to the configuration of the display device 4 and the reflecting member 6. The threshold 33 can be set in advance and stored in the storage unit 38 such as a memory. As the storage unit 38, one mounted on the control board 16 can be used.

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

  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, or the like.

  The control unit 34 can be provided in a 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 (the liquid crystal panel 4a), the backlight 17, the angle changing mechanism 21 (the drive motor 23), and the like to control them. Note that the storage unit 38 can also be set in a memory or the like built in a one-chip microcomputer constituting the control circuit.

  And the control part 34 makes the reflection member 6 into a protection mode etc. according to the process as described in the flowchart of FIG. 6, for example.

  That is, almost simultaneously with the start of use of the head-up display device 2, in step 1, the incident amount of the external light 8 is detected based on the output of the external light detection sensor 31 (detection signal 32). Then, the process proceeds to Step 2.

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

  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 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 33), the process proceeds to step 4, and in step 4, “HUD may exceed the guaranteed temperature. The guidance for stopping the display is output to the display device 4 of the head-up display device 2 (HUD) or the instrument device (the 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 switched from operation (display) to stop (non-display), and the backlight 17 is turned off. Then, the process proceeds to Step 6.

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

  Thereafter, 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 determines whether or not the display can be restarted.

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

  First, in step 7, the resumption detection operation is performed after a predetermined time (h time) has elapsed since the reflecting member 6 was set to the protection position 9. In the restart detection operation, the angle of the reflecting 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 based on the output of the external light detection sensor 31, and it is determined whether the external light 8 is hitting the screen of the display device 4.

  When 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 reflecting 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 on from being turned off, and the process proceeds to step 3 to display the display device 4 in a normal display (display restart).

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

  Then, the display restart determination unit 61 determines whether or not display can be restarted in the following manner while performing the restart detection operation of the reflecting member 6.

  FIG. 7 shows the amount of incident external light 8, the output of the sensor (the detection signal 32 of the sensor 31 for detecting external light), and (on / off) control of the backlight 17 to show how to determine whether or not to resume display. 4 is a time chart in which graphs representing the (angle) control of the reflecting 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 just before time (2) from a weak state as shown in time (1), reaches a peak when time (3) is passed, and reaches at time (6). Suppose that it starts to fall from the peak, returns to the weak state at time (8), and changes so that the weak state continues as it is.

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

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

  At time (3), the detection signal 32 of the external light detection sensor 31 exceeds the threshold 33. Therefore, the backlight 17 is turned off, the reflecting member 6 is rotated to the protection position 9, and the protection mode is started. Before entering the protection mode, a message indicating “entering the protection mode” may be transmitted to the passenger on the display device 4 or the like.

  While the output of the external light detection sensor 31 exceeds the threshold 33 as in the time (4) to (8), after the time (4) when a 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 greater than the threshold value 33, the reflecting member 6 is returned to the protection position 9. The predetermined time (h time) and the predetermined time interval described above can be arbitrarily determined.

  During this time, the backlight 17 is turned off and the display device 4 is in a non-display state, so that the occupant does not notice the rotation of the reflecting member 6. In addition, since the measurement by the external light detection sensor 31 performed by rotating the reflecting 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 is It is small and there is no possibility that the display device 4 is destroyed.

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

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

  Then, at time (9), since the output of the sensor 31 for detecting external light becomes equal to or less than the threshold value 33, the protection mode is terminated and the reflecting member 6 is rotated to the display position 7. Then, the backlight 17 is turned on, and the display on the display device 4 is resumed. Before ending the protection mode and restarting the display, the display device 4 may transmit a message “restart display” to the passenger.

  (2) Furthermore, the external light detection sensor 31 detects at least two or more positions away from the outer peripheral portion 35 on the surface of the display device 4 in the opposite direction 36 or the opposite direction 37 (for example, FIG. 5). You may install so that it may be prepared.

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

  The diagonal direction 37 is a direction connecting one of two opposing corners on the rectangular display surface of the display device 4.

  Two or more positions may be detected by one external light detection sensor 31 or 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 an illuminance sensor 41 and a temperature sensor 42.

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

  The temperature sensor 42 detects the amount of incident external 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 using a preset conversion equation or the like.

  Since at least one illuminance sensor 41 and one temperature sensor 42 are detected, one or more illuminance sensors 41 and temperature sensors 42 are used. The illuminance sensor 41 and the temperature sensor 42 can be provided as appropriate at the positions of the middle part and the end part (corner part) of the side constituting the outer peripheral part 35 of the display device 4. The plurality of sensors 31 for detecting external light may be attached to any of the four sides or the four corners of the display device 4 as long as at least one set is separated in the opposite direction 36 or the opposite direction 37. .

  For example, two illuminance sensors 41 and temperature sensors 42 may be provided at both end portions of one side constituting the outer peripheral portion 35 of the display device 4 (separated in the opposite direction 36). In addition, for example, the two illuminance sensors 41 and the temperature sensor 42 may be provided in the middle part of the opposite side constituting the outer peripheral part 35 of the display device 4 (separated in the opposite direction 36). However, as in this embodiment, it is most preferable to detect the external light detection sensor 31 with respect to the positions of the four corners of the display device 4.

  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 together.

  <Operation> The operation of this embodiment will be described below.

  The head-up display device 2 reflects the driving information 3 (displayed image) from the display device 4 toward the front of the passenger compartment 5 by the reflecting member 6, so that the virtual image 28 of the driving information 3 is displayed in front of the passenger compartment 5. Thus, the driving information 3 can be viewed without causing the occupant who is driving facing the front to move the line of sight.

  At this time, by providing the reflecting member 6, it is possible to lengthen the optical path of the operation information 3 from the display device 4 (so that the imaging position becomes far), or to enlarge the operation information 3. Therefore, it is possible to achieve a far display and a large angle of view of the driving information 3. As described above, the reflecting member 6 is an important component for displaying the driving information 3 at a distance, increasing the angle of view, and the like.

  The head-up display device 2 having the reflecting member 6 is provided with a protection mechanism 11 so that the display device 4 is protected from a temperature rise due to the incidence of external light 8 (mainly sunlight) by the protection mechanism 11. I have to. The protection mechanism 11 controls the display device 4 (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). The angle is changed between the display position 7 where the information 3 can be displayed and the protection position 9 where the display device 4 can be protected against the incidence of the external light 8.

  By directing the reflecting member 6 toward the protection position 9, the external light 8 entering 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 do. Incidentally, when the reflecting member 6 (second reflecting mirror 6b) is a magnifying mirror, the external light 8 is condensed and displayed at a magnification corresponding to the magnifying magnification of the reflecting member 6 if the protection mechanism 11 is not provided. The device 4 will be strongly illuminated. When the reflecting 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 is lowered by the stop of the display.

  The protection mechanism 11 includes the external light detection sensor 31 and the control unit 34, so that the control unit 34 can detect when the detection signal 32 from the external light detection sensor 31 exceeds a predetermined threshold 33. The display of the display device 4 can be stopped and the protection mode in which the reflecting member 6 is retracted to the protection position 9 can be automatically switched to.

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

  For example, when the external light 8 entering the inside of the main body casing 14 hits the surface (display surface) of the display device 4 locally, the detection result is different from the actual result. The outside light 8 entering the main body casing 14 varies in various ways depending on the position of the sun, the orientation of the vehicle 1 and the weather, but the outside light detection sensor 31 is only provided in the opening. And it cannot respond to the change of the external light 8 which enters the inside of the main body casing 14. If the correct detection result cannot be 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 sensor 31 for detecting external light, the display resumption determining unit 61,

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

  The control unit 34 includes a display restart determination unit 61. The display resumption determination unit 61 performs a resumption detection operation for temporarily returning the reflecting member 6 from the protection position 9 to the display position 7 in the protection mode, thereby removing the actual incident amount of the external light 8 on the display position 7. Direct detection by the light detection sensor 31 determines whether or not display can be resumed.

  In this manner, by determining whether or not the display device 4 can be restarted, it is possible to accurately determine whether or not the display can be restarted.

  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 casing 14, the actual external light for the display device 4 is detected. Therefore, it is difficult to accurately determine whether display can be resumed.

  Then, the display resumption determining unit 61 moves the reflecting member 6 from the protection position 9 to the display position 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 33. Returning to step 7, the display on the display device 4 is resumed.

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

  Note that display is not performed during the restart detection operation. In the restart detection operation, the external light detection sensor 31 returns the reflecting member 6 to the display position 7 for a moment (a short time necessary for detecting the incident amount of the external light 8). During the detection operation, the display device 4 is not affected by the incident external light 8.

  (Effect 2) Installation of external light detection sensor 31

  The sensor 31 for detecting external light may be provided so as to be able to detect at least two or more positions separated in the opposite direction 36 or the opposite direction 37 with respect to the outer peripheral portion 35 on the surface of the display device 4. 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 a change in the external light 8 entering the inside of the main casing 14.

  Therefore, it is possible to accurately determine the time when the protection mode is set by correctly detecting the actual incident amount of the external light 8 regardless of the change of the external light 8. Thereby, the display apparatus 4 can be protected more effectively and reliably.

  (Effect 3) Illuminance sensor 41 or temperature sensor 42

  The ambient light detection sensor 31 may be at least one of the illuminance sensor 41 and the temperature sensor 42. Thereby, the sensor 31 for detecting external light is installed at at least two or more positions away from the opposite side direction 36 or the diagonal direction 37 in the outer peripheral portion 35 of the surface of the display device 4 to adjust the illuminance, temperature, light quantity, etc. It can be directly measured to make it suitable for obtaining the actual amount of incident external light 8 on the display device 4.

  At this time, the external light detection sensor 31 directly detects the incident amount of the external light 8 like the illuminance sensor 41, thereby simplifying the control.

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

DESCRIPTION OF SYMBOLS 2 Head-up display apparatus 3 Driving | operation information 4 Display apparatus 5 Car compartment 6 Reflective member 7 Display position 8 External light 9 Protection position 11 Protection mechanism 31 Sensor for external light detection 32 Detection signal 33 Threshold value 34 Control part 35 Outer peripheral part 36 Opposite side direction 37 Diagonal direction 41 Illuminance sensor 42 Temperature sensor 61 Display restart judgment unit

Claims (3)

A display device capable of displaying driving information;
A reflective member capable of reflecting driving information from the display device toward the front of the passenger compartment;
In the head-up display device provided with a protection mechanism capable of changing the angle between a display position where the operation information can be displayed and a protection position where the display device can be protected from the incidence of external light.
The protection mechanism is an external light detection sensor capable of detecting external light;
When a detection signal from the outside light detection sensor exceeds a predetermined threshold, the display unit is stopped, and a control unit is set in a protection mode for retracting the reflecting member to a protection position.
The outside light detection sensor is installed on the outer periphery of the surface of the display device,
While the control mode is in the protection mode, the control unit temporarily returns the reflecting member to the display position and detects external light by the external light detection sensor, thereby determining whether or not display can be resumed. A head-up display device comprising a display resumption determination unit. The head-up display device according to claim 1,
The head-up display, wherein the sensor for detecting outside light is provided so as to be capable of detecting at least two positions separated in the opposite direction or the diagonal direction with respect to the outer peripheral portion of the surface of the display device. apparatus. The head-up display device according to claim 1 or 2,
The head-up display device, wherein the external light detection sensor is at least one of an illuminance sensor and a temperature sensor.