JP2019089436A - Head-up display device - Google Patents

Abstract

To chiefly enable accurate detection of an amount of incidence of actual external light to a display device.SOLUTION: A head-up display device 2 includes: a display device 4 which can display driving information 3; a reflection member 6 which can reflect the driving information 3 from the display device 4 toward the front of a cabin 5; and a protection mechanism 11 which can change an angle of the reflection member 6 between a display position 7 and a protection position 9. The protection mechanism 11 includes: an external light detection sensor 31 which can detect external light 8, and a control unit 34 which stops the display on the display device 4 and sets a protection mode in which the reflection member 6 retreats to the protection position 9 when a detection signal 32 from the external light detection sensor 31 exceeds a predetermined threshold 33. The external light detection sensor 31 is provided so as to be able to detect at least two or more positions separated in an opposite side direction 36 or an orthogonal direction 37 with respect to an outer periphery 35 of the surface of the display device 4.SELECTED DRAWING: Figure 2

Description

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

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

  There are various types of head-up display devices, but they have 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 Things exist.

  In the head-up display device having such a configuration, the reflection information reflects the driving information from the display device toward the front of the vehicle compartment, thereby generating a virtual image of the driving information in front of the vehicle compartment, and the front surface The driving information can be viewed without causing the occupant who is driving facing the eye movement. At this time, by providing the reflection member, it is possible to lengthen the optical path of the operation information from the display device or to expand the operation information, thereby making it possible to achieve a large angle of view of the display. It will be.

  And when a head-up display apparatus has a reflecting member, providing a protection mechanism which can protect a reflecting member is also performed.

  This protection mechanism changes the angle between the display position where the reflection member can display the operation information and the protection position where the display device can be protected from the incident (increase in temperature due to outside light (mainly, sunlight etc.) It is supposed to

  Then, by directing the reflective member to the protection position, the outside light entering the inside of the head-up display device is deflected so as not to illuminate the display device, and thus the display device can be protected from the outside light. Incidentally, in the case where the reflecting member is a magnifying glass, without the protective mechanism, the external light is condensed at a magnification according to the magnification of the reflecting member to strongly illuminate the display. When the reflecting member is placed in the protection position, the display on the display device is stopped.

JP 2005-331624 A

  However, in the head-up display device described in Patent Document 1 described above, an external light detection sensor used to detect external light and set the reflection member to a protection position or the like is a main body of the head-up display device. Since it was provided at the position of the opening (outgoing portion), the actual amount of incident external light to the display device could not be detected directly, and the correct detection result could not be obtained.

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

In order to solve the above problems, the present invention is
A display device capable of displaying driving information;
A reflective member capable of reflecting the driving information from the display device toward the front of the cabin;
A head-up display device comprising: a reflection member, a display position capable of displaying operation information, and a protection mechanism capable of changing an angle between protection positions capable of protecting the display device from the incidence of external light;
An ambient light detection sensor capable of detecting ambient light by the protection mechanism;
The control unit stops the display of the display device when the detection signal from the ambient light detection sensor exceeds a predetermined threshold, and sets the reflection member in a protection mode to retract to a protection position.
The outside light detecting sensor may be provided so as to be able to detect at least two or more positions separated in opposite directions or in a diagonal direction with respect to an outer peripheral portion of a surface of the display device.

  According to the present invention, with the above configuration, it is possible to accurately detect the actual amount of incident external light on the display device.

It is a figure showing the state where the head up display device concerning this embodiment was carried to vehicles. 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 reflective member of FIG. It is a control systematic diagram of a head up display device. It is a figure which shows the attachment state of the sensor (illuminance sensor or temperature sensor) for external light detection provided in the outer peripheral part of the surface of a display apparatus. It is a figure which shows the attachment state of the sensor (external light detection element which made the rectangular frame shape) for the external light detection provided in the outer peripheral part of the surface of a display apparatus.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.
1 to 6 are for explaining this embodiment.

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

  As shown in FIG. 1, a head-up display device 2 that can be mounted on a vehicle 1 such as a car is provided. In addition, about a direction, it is set as the vehicle longitudinal 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
As shown in FIG. 2, a display device 4 capable of displaying 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, as shown in FIG. 3, the reflective member 6 can be angle-changeable protected between the display position 7 capable of displaying the operation information 3 and the protection position 9 capable of protecting the display device 4 from the incident of the external light 8 A mechanism 11 is provided.

  Here, in a vehicle 1 such as a car, a passenger compartment 5 for a passenger to board is provided. 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 provided 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 makes it possible to visually recognize the driving information 3 without causing the occupant driving while facing the front to make a large eye movement.

  The head-up display device 2 has a main body casing 14 in which the display device 4 and the reflection member 6 are accommodated. The main casing 14 is installed in the passenger compartment 5 (in the instrument panel 13) with its width direction directed substantially in the vehicle width direction Y. In the upper part of the main body casing 14, an opening serving as an emission part of the driving information 3 into the compartment 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 or the like which is recessed downward as viewed from the side. The control board 16 can be installed inside the main body casing 14.

  The driving information 3 is general information to support driving, for example, speed information, road information (for example, lane display, leading car display, oncoming car display, pedestrian display, etc.), course information (For example, right turn indication or left turn indication), destination information (for example, arrival time or travel distance to destination), traffic jam information, service information (for example, parking lot information, gas station information, etc. Peripheral facility guidance) and other displays can be used.

  The display device 4 can use a liquid crystal panel 4a, an organic EL panel, or the like. In addition, a projector using a DLP unit can also be used. The display device 4 has a rectangular display surface or the like. In the case of the liquid crystal panel 4a, a backlight 17 is provided on the back side. The back light 17 has an LED 17 b serving as a light source, a heat sink 17 c and the like installed on the back side of the cylindrical reflector 17 a. The 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 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 for the reflecting mirror. 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 light path) inside the main body casing 14, and the first reflecting mirror 6a An infrared transmitting type) planar mirror and the second reflecting mirror 6b are curved mirrors (concave mirrors or magnifying mirrors).

  The first reflecting mirror 6a is installed at the rear side (vehicle 1 rear side) position of the main body casing 14, and the second reflecting mirror 6b is installed at the front side of the main body casing 14 (vehicle 1 front side). The optical path of the operation information 3 is formed in the main body casing 14. The number and the 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 changing mechanism 21 can change the angle of the second reflecting mirror 6b as described later.

  The second reflecting mirror 6 b is mounted rotatably integrally with the rotating shaft 22, and is thus changed in angle by rotation about the rotating shaft 22, and the angle changing mechanism 21 is an output shaft of the drive motor 23. And a driven gear 25 for transmitting the driving force of the drive gear 24 to the rotating shaft 22. As shown in FIG.

  The rotation 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 second reflecting mirror 6 b is capable of changing the angle between the display position 7 and the protection position 9, but the display position 7 is a car that passes driving information 3 reflected by the first reflecting mirror 6 a through the dustproof cover 15. It is a direction of reflection toward the inside of the chamber 5. In the compartment 5, a reflection portion 27 (FIG. 1) is provided for reflecting the driving information 3 reflected into the compartment 5 toward the driver at the driver's seat. The reflecting portion 27 may be the front window glass 12 of the vehicle 1 or may be a dedicated reflecting plate (combiner). The front window glass 12 becomes a reflection portion 27 by performing a reflection process (for example, providing a fine reflection surface or providing a reflection film). The driving information 3 reflected by the reflection unit 27 is imaged as a virtual image 28 (FIG. 1) at a position in front of the reflection unit 27, and the driver's seat occupant overlaps the external scenery viewed through the front window glass 12. It becomes possible to visually recognize the virtual image 28 of the driving information 3.

  The protection position 9 is a position for preventing the external light 8 from being incident from the dustproof cover 15 back to the inside of the main body casing 14 and being reflected by the reflection member 6 to reach the display device 4. The reflecting member 6 (second reflecting mirror 6 b) is moved to the protection position 9 as needed during use of the head-up display device 2. Inside the main body casing 14, an absorbent or the like may be provided to absorb the external light 8 reflected by the reflection member 6 at the protection position 9.

  In contrast to the basic configuration as described above, in this embodiment, the following configuration is provided.

(1) As shown in FIG. 4, an external light detection sensor 31 capable of detecting the external light 8 by the protection mechanism 11;
When the detection signal 32 from the ambient light detection sensor 31 exceeds the predetermined threshold 33, the control unit 34 stops the display of the display device 4 and sets the reflection member 6 in the protection mode to retract to the protection position 9 Is equipped.
Then, the ambient light detection sensor 31 can detect at least two or more positions away from each other in the opposite direction 36 or the diagonal direction 37 (for example, FIG. 5) with respect to the outer peripheral portion 35 of the surface of the display device 4 To be able to

  Here, the ambient light detection sensor 31 is a sensor for detecting the ambient light 8 and any sensor may be used as long as the ambient light 8 can be detected.

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

  The threshold value 33 is set as a value of a size such that the outside light 8 does not affect the display device 4. The threshold 33 can be set in advance and stored in the storage unit 38 such as a memory.

  The control unit 34 can be provided as hardware or software in a control circuit mounted on the control board 16. For example, a computer such as a one-chip microcomputer can be used as the control circuit. The control unit 34 can send commands to the display device 4 (the liquid crystal panel 4a thereof), the angle change mechanism 21 (the drive motor 23), and the like to control them.

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

  The outer peripheral portion 35 is a portion that is 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 opposite direction 36 is a direction connecting any one of two pairs of opposing sides in the rectangular display surface of the display device 4.

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

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

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

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

  The temperature sensor 42 measures the temperature of the surface of the display device 4 to detect the amount of incident external light 8 on the surface of the display device 4. The temperature measured by the temperature sensor 42 can be converted into the amount of incident external light 8 using a conversion equation set in advance.

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

  For example, two illuminance sensors 41 and two temperature sensors 42 may be provided at both ends of one side of the outer peripheral portion 35 of the display device 4 (away in the opposite direction 36). Further, for example, two illuminance sensors 41 and two temperature sensors 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 provide the ambient light detecting sensor 31 for each of the four corner portions of the display device 4 in order to detect.

  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.

(3) As shown in FIG. 6, the ambient light detection sensor 31 may be a light receiving element 51 having a rectangular frame shape.
The light receiving element 51 may be attached to the outer peripheral portion 35 of the surface of the display device 4 via the opaque member 52 capable of blocking the influence of light from the display device 4.

  Here, the light receiving element 51 is an element that generates an electrical signal according to the amount of light received by receiving light. The light receiving element 51 is an external light detection sensor 31 that can detect two or more positions with one light receiving element. The light receiving element 51 can be made into a relatively free shape in accordance with the outer peripheral portion 35 of the display device 4. For example, the light receiving element 51 may be formed substantially in an I shape, an L shape, a U shape, a C shape, or the like in a plan view along a side constituting the outer peripheral portion 35 of the display device 4 . However, it is most preferable to detect that the light receiving element 51 has a rectangular frame shape along the entire circumference of the outer peripheral portion 35 of the display device 4 as in this embodiment. The output line 53 from the light receiving element 51 may be merged with the cable 18 or the like.

  The light from the display device 4 is, for example, light from the backlight 17 in the case of the liquid crystal panel 4a. If the influence of the light from the display device 4 is already blocked, the opaque member 52 is not particularly required, but it is preferable to provide the opaque member 52.

  The light-impermeable member 52 may be made of any material such as resin, rubber, or metal as long as it can block the influence of light. Further, the opaque member 52 may be a sheet or a film such as a coating film.

  <Operation> The operation of this embodiment 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 passenger compartment 5 by the reflecting member 6 to make a virtual image 28 of the driving information 3 forward of the passenger compartment 5. In order to make it possible to visually recognize the driving information 3 without causing a passenger driving toward the front to cause a large eye movement. 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 image forming position becomes far) or to expand the operation information 3 Thus, it is possible to achieve a wide angle of view of the display. Thus, the reflective member 6 is an important component for achieving a wide angle of view.

  The head-up display device 2 having the reflection 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 incidence of external light 8 (mainly sunlight etc.) I have to. The protection mechanism 11 can protect the display member 4 against the display position 7 where the reflection information 6 (in this embodiment, the second reflection mirror 6b in this embodiment) can display the driving information 3 and the incidence of the external light 8 The angle is changed between the protection positions 9.

  Since the external light 8 entering the inside of the head-up display device 2 is deflected so as not to illuminate the display device 4 by directing the reflecting member 6 to the protection position 9, the display device 4 is protected from the external light 8. Can. Incidentally, when the reflection member 6 (second reflection mirror 6b) is a magnifying glass, without the protection mechanism 11, the external light 8 is condensed at a magnification according to the magnification of the reflection member 6 and displayed. The device 4 will be strongly illuminated. When setting the reflecting member 6 to the protection position 9, the display of the display device 4 is stopped, and the temperature decrease of the display device 4 can be achieved by stopping the display.

  When the protection mechanism 11 includes the ambient light detection sensor 31 and the control unit 34, the control unit 34 detects that the detection signal 32 from the ambient light detection sensor 31 exceeds the predetermined threshold 33, It is possible to automatically switch to the protection mode in which the display of the display device 4 is stopped and the reflection member 6 is retracted to the protection position 9.

  At this time, for example, the ambient light detection sensor 31 is provided at only one position at the opening (outgoing portion) of the main body of the head-up display device 2 (farthest from the display device 4 in the optical path). Otherwise, the external light detection sensor 31 provided at one position of the opening detects the external light 8 from various directions, so the display device 4 installed inside the main body casing 14 is actually used. The amount of incident external light 8 can not be detected directly, which makes it difficult to obtain correct detection results.

  For example, in the case where the external light 8 entering the inside of the main body casing 14 is locally applied to the surface (display surface) of the display device 4, the detection result is different from the actual result. Moreover, although the external light 8 which enters the inside of the main body casing 14 changes variously according to the position of the sun, the direction of the vehicle 1, the change of the weather, etc., the sensor 31 for detecting external light is provided at only one place in the opening. However, such changes in the ambient light 8 entering the interior of the main body casing 14 can not be accommodated. Then, if the correct detection result can not be obtained, there is a possibility that the display device 4 can not be protected effectively.

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

  (Effect 1) About the sensor 31 for detecting external light

  The sensor 31 for detecting external light is provided on an outer peripheral portion 35 of the surface of the display device 4 (for example, a portion to be 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. As a result, it is possible to accurately detect the actual amount of incident external light 8 entering the interior of the main body casing 14 to the display device 4, and to set the protection mode at an optimal time.

  Further, the outside light detecting sensor 31 is provided so as to be able to detect at least two or more positions away from each other in the opposite direction 36 or the diagonal direction 37 with respect to the outer peripheral portion 35 of the surface of the display device 4. As a result, the outer peripheral portion 35 of 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, it is possible to correctly detect the actual incident amount of the external light 8 regardless of the change of the external light 8 and to accurately determine the time to set the protection mode. Thereby, the display device 4 can be protected more effectively and reliably.

  (Effect 2) About the illuminance sensor 41 or the temperature sensor 42

  The ambient light detection sensor 31 may be at least one of the illumination sensor 41 and the temperature sensor 42. As a result, the ambient light detection sensor 31 is installed at at least two or more positions separated in the opposite direction 36 or the diagonal direction 37 in the outer peripheral portion 35 of the surface of the display device 4 to detect illuminance, temperature, light intensity, and the like. The measurement can be made directly to be suitable for obtaining the actual amount of incident external light 8 to the display device 4 or the like.

  At this time, by directly detecting the incident amount of the external light 8 as in the illuminance sensor 41, the control of the external light detection sensor 31 can be simplified.

  Further, by setting the ambient light detection sensor 31 as the temperature sensor 42, it is possible to detect the surface temperature of the outer peripheral portion 35 of the surface of the display device 4 and to set the incident amount of the ambient light 8.

  (Effect 3) About the rectangular frame-shaped light receiving element 51

  The ambient light detection sensor 31 may be a light receiving element 51 shaped like a rectangular frame. Thereby, the amount of light reception can be directly measured at the position of the entire circumference of the outer peripheral portion 35 of the surface of the display device 4, and the actual amount of incident external light 8 or the like to the display device 4 can be obtained. Therefore, it is possible to obtain more accurate detection results.

  At this time, by directly detecting the incident amount of the external light 8 as in the light receiving element 51, the control of the external light detection sensor 31 can be simplified.

  In addition, the light receiving element 51 may be attached to the outer peripheral portion 35 of the surface of the display device 4 through the light non-transmissive member 52. Thereby, the influence of the light from (the back light 17 of) the display device 4 can be cut off surely, and the detection accuracy of the external light 8 can be enhanced.

Reference Signs List 2 head-up display device 3 operation information 4 display device 5 compartment 6 reflection member 7 display position 8 outside light 9 protection position 11 protection mechanism 31 sensor for detecting outside light 32 detection signal 33 threshold 34 control unit 35 outer periphery 36 opposite side 37 Diagonal direction 41 illuminance sensor 42 temperature sensor 51 light receiving element 52 opaque member

Claims (3)

A display device capable of displaying driving information;
A reflective member capable of reflecting the driving information from the display device toward the front of the cabin;
A head-up display device comprising: a reflection member, a display position capable of displaying operation information, and a protection mechanism capable of changing an angle between protection positions capable of protecting the display device from the incidence of external light;
An ambient light detection sensor capable of detecting ambient light by the protection mechanism;
The control unit stops the display of the display device when the detection signal from the ambient light detection sensor exceeds a predetermined threshold, and sets the reflection member in a protection mode to retract to a protection position.
A head-up display characterized in that the ambient light detection sensor is capable of detecting at least two or more positions separated in opposite directions or diagonal directions with respect to an outer peripheral portion of a surface of the display device. apparatus. In the head-up display device according to claim 1,
The head-up display device, wherein the ambient light detection sensor is at least one of an illuminance sensor and a temperature sensor. In the head-up display device according to claim 1,
The ambient light detection sensor is a light receiving element having a rectangular frame shape,
A head-up display device characterized in that the light receiving element is attached to the outer peripheral portion of the surface of the display device through an opaque member capable of blocking the influence of light from the display device.