Display device for vehicle

Abstract

In a display device (1) for a vehicle, a brightness adjustment unit (13) adjusts the brightness of a driver (D) when the age of the driver (D) estimated by an age estimation unit (11) is relatively large on the basis of a change in the brightness state around the vehicle on the basis of the illuminance detected by an illuminance sensor (2) for detecting the illuminance around the vehicle. When the age of the driver (D) is relatively small, the response of the brightness adjustment of the virtual image (S) with respect to the detected change in illuminance is relatively accelerated, and when the age of the driver (D) is relatively small, the response of the brightness adjustment of the virtual image (S) with respect to the detected change in illuminance is relatively slowed.

Description

Technical Field

[0001] The present invention relates to a display device for a vehicle. Background Art

[0002] In an augmented reality head-up display (AR-HUD) device mounted on a vehicle such as a car, there is a device that uses an illuminance sensor mounted on the vehicle side to adjust the brightness of a virtual image. The illuminance sensor detects the brightness in the upward direction outside the vehicle and is mainly used for automatic lights that function as headlights. Therefore, there is a case where the brightness detected by the illuminance sensor is different from the brightness felt by the driver looking ahead.

[0003] On the other hand, since there are individual differences in the way the driver perceives the brightness of the virtual image displayed in front of him, there is a device that uses an illumination sensor and the pupil diameter of the driver's pupil to adjust the brightness of the virtual image (for example, see Patent Document 1). In addition, there is a technology that determines the display content and display position of the virtual image for each driver based on attribute information such as the driver's age and gender (for example, see Patent Document 2).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2018-43724

[0007] Patent Document 2: Japanese Patent Application Publication No. 2019-59245 Summary of the invention

[0008] Technical problem that the invention aims to solve

[0009] However, the way of perceiving surrounding brightness tends to change with age (e.g., reference "Vision 1 Structure and Initial Function of the Visual System", P192, a graph showing changes in brightness perception with age). In addition, when a vehicle passes through a tunnel during the day on a sunny day, for example, the surroundings of the vehicle change from a bright state to a dark state, and then from a dark state to a bright state, and sometimes it is temporarily difficult to see the virtual image that the driver visually confirms in front of the vehicle. Dark adaptation and light adaptation usually slow down the adaptation time with age, so for example, when a vehicle moves from a bright place to a dark place, the virtual image is too bright and it may be difficult to see the front, so there is room for improvement.

[0010] An object of the present invention is to provide a vehicle display device capable of adjusting the brightness of a displayed virtual image with high accuracy.

[0011] Technical solutions to the problem

[0012] In order to achieve the above-mentioned purpose, the vehicle display device involved in the present invention is characterized in that it includes an image display unit, which projects a display image onto a projected component of the vehicle so that the driver of the vehicle can visually confirm a virtual image corresponding to the display image projected onto the projected component; an illuminance detection unit, which detects the illuminance around the vehicle; an age acquisition unit, which acquires the age of the driver; and an adjustment unit, which adjusts the brightness of the virtual image based on the illuminance detected by the illuminance detection unit and the age acquired by the age acquisition unit, and the adjustment unit adjusts the brightness of the virtual image based on the change of the light and dark state around the vehicle based on the illuminance detected by the illuminance detection unit. When the age of the driver acquired by the age acquisition unit is relatively old, the response of the brightness adjustment of the virtual image to the change of the detected illuminance is relatively fast, and when the age of the driver is relatively young, the response of the brightness adjustment of the virtual image to the change of the detected illuminance is relatively slow.

[0013] Effects of the Invention

[0014] According to the vehicle display device according to the present invention, it is possible to adjust the brightness of a displayed virtual image with high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram showing a schematic configuration of a vehicle display device according to an embodiment.

[0016] Figure 2 It is a block diagram showing a schematic configuration of a vehicle display device according to an embodiment.

[0017] Figure 3 This is a flowchart showing the flow of brightness adjustment of a virtual image in the vehicle display device according to the embodiment.

[0018] Figure 4 It is a diagram showing an example of an age classification coefficient table in the embodiment.

[0019] Figure 5 This is a schematic diagram showing an example of changes in brightness of a virtual image when a vehicle passes through a tunnel. DETAILED DESCRIPTION

[0020] Hereinafter, the embodiment of the vehicle display device involved in the present invention will be described in detail with reference to the accompanying drawings. In addition, the present invention is not limited to the following embodiments. That is, the constituent elements in the following embodiments include elements that can be easily thought of by those skilled in the art or substantially the same elements, and various omissions, substitutions, and changes can be made within the scope of not departing from the main purpose of the invention.

[0021] [Implementation Method]

[0022] like Figure 1 As shown, the vehicle display device 1 involved in the present embodiment is, for example, a head-up display (HUD) mounted on a vehicle 100 such as an automobile. The vehicle display device 1 projects the display image displayed on the display device 6 onto the windshield W as the projection component via the reflector 5, so that the driver D of the vehicle 100 can visually recognize it as a virtual image S. The display image includes, for example, numbers, characters, symbols, graphics, icons, etc. representing information related to the vehicle 100, information outside the vehicle, etc. The vehicle display device 1 can, for example, display the virtual image S in a superimposed manner on vehicles, pedestrians, traffic lights, signs, lanes, etc. in the actual scene in front of the driver D. The vehicle display device 1 is, for example, arranged on the inner side of a dashboard (not shown) in the vehicle cabin.

[0023] The windshield W has a semi-transmissive property that reflects a part of the incident light and transmits the other part, and therefore, the display image projected from the vehicle display device 1 is reflected as the display light L toward the eye point EP of the driver D while transmitting the foreground of the vehicle. The eye point EP is assumed to be the viewpoint position of the driver D in advance. The driver D recognizes the display image reflected by the windshield W as a virtual image S. For the driver D, the virtual image S is recognized in front of the windshield W.

[0024] The vehicle display apparatus 1 includes an illuminance sensor 2 , a driver camera 3 , a housing 4 , three reflective mirrors 5A to 5C, a display device 6 , and a processing unit 7 .

[0025] The illuminance sensor 2 is an example of an illuminance detection unit, and detects the illuminance of the vehicle 100. The illuminance sensor 2 is installed, for example, on the inner side of the dashboard or the interior mirror (not shown) in the vehicle interior, and detects the illuminance in front of the vehicle, for example, around the vehicle 100. The illuminance sensor 2 is activated when the ACC (accessory) power supply or the IG (ignition) power supply of the vehicle 100 is turned on, and continues to detect the illuminance until these powers are turned off. The illuminance sensor 2 is connected to the processing unit 7, for example, via a signal line Ta. The illuminance sensor 2 outputs the illuminance detected by the illuminance sensor 2 to the processing unit 7 via the signal line Ta as illuminance information.

[0026] The driver camera 3 is an example of a photographing unit, and the camera lens (not shown) is arranged toward the driver D, and continuously acquires facial images including the face F of the driver D. The driver camera 3 is, for example, arranged on the upper part of the steering column (not shown) in the vehicle cabin, and is arranged behind the steering wheel (not shown) when viewed from the driver D. The driver camera 3 can, for example, photograph the face F of the driver D, and acquire a still image (frame) obtained from the captured dynamic image as a facial image. As the shooting environment of the driver camera 3, for example, the sensor size is set to "VGA (640×480)" and the frame rate is set to "30 [fps]". The driver camera 3 is connected to the processing unit 7 via the signal line Tb. The driver camera 3 outputs the acquired facial image to the processing unit 7 via the signal line Tb.

[0027] The driver camera 3 has, for example, a light source not shown in the figure. The light source is, for example, an LED (Light Emitting Diode) that emits near-infrared light toward the driver D. The light source is turned on (emitted infrared light) in response to a lighting signal input from a control unit not shown in the figure, and is turned off in response to an off signal. The driver camera 3 receives reflected light of the light irradiated from the light source to the face F of the driver D to photograph the face of the driver D. The driver camera 3 is activated when the ACC power supply of the vehicle 100 is turned on, and continues to photograph the face of the driver D until the power supply is turned off.

[0028] The housing 4 is formed of, for example, synthetic resin, and is fixed to a vehicle body (not shown). Figure 1 As shown, the housing 4 accommodates and supports the reflectors 5A to 5C and the display device 6 therein.

[0029] The reflectors 5A to 5C are disposed on the optical path of the display light L from the display device 6 to the windshield W, and reflect the display light L emitted from the display device 6 toward the windshield W. The reflectors 5A to 5C are constituted by, for example, a plane mirror, a concave mirror, or the like.

[0030] The display device 6 is an example of an image display unit, and emits a display image that is visually recognized as a virtual image S by the driver D of the vehicle 100 as display light L. That is, the vehicle display device 1 projects the display image displayed by the display device 6 onto the windshield W using the reflectors 5A to 5C, so that the driver D can visually recognize the virtual image S corresponding to the display image projected onto the windshield W. The display device 6 is, for example, a light-transmitting display that transmits light from the back side to the front side. As a light-transmitting display, for example, a TFT (Thin Film Transistor) liquid crystal display is used. The display device 6 is started when the ACC power supply of the vehicle 100 is turned on, and is continuously driven until the power supply is turned off.

[0031] The processing unit 7 executes various processes in the vehicle display device 1. The processing unit 7 is composed of various computers, for example. Figure 2 As shown, the processing unit 7 of this embodiment is functionally configured to include an age estimation unit 11, a pupil diameter calculation unit 12, a brightness adjustment unit 13, and an image output unit 14. The age estimation unit 11, the pupil diameter calculation unit 12, the brightness adjustment unit 13, and the image output unit 14 perform various functions, for example, by executing a program by a computer (e.g., a microcomputer) constituting the processing unit 7. The various functions include well-known image processing, detection processing of the pupil E, and the like. The processing unit 7 is connected to the display device 6 via a signal line Tc. The processing unit 7 outputs a display image displayed by the display device 6 to the display device 6 via the signal line Tc.

[0032] The age estimation unit 11 estimates the age of the driver D based on the facial image captured by the driver camera 3. The age estimation unit 11 estimates the age of the driver D by analyzing the facial image using, for example, known image processing. The age estimation unit 11 stores the estimated age as age information in a memory provided in the processing unit 7, or updates the age information stored in the memory to new age information.

[0033] The pupil diameter calculation unit 12 detects the pupil E of the driver D based on the facial image captured by the driver camera 3, and calculates the pupil diameter PD of the pupil E. The pupil diameter calculation unit 12 uses, for example, known image processing to roughly search for the pupil E of the driver D from a facial image of one frame, and detects the pupil E based on the result. Known image processing includes, for example, the Viola-Jones method, a model-based method using a 3D model of the eyeball, a template matching method, a particle method, and the like. In addition, the pupil diameter calculation unit 12 calculates the pupil diameter PD of the pupil E based on the detected pupil E. The pupil diameter calculation unit 12 sequentially calculates the pupil diameter PD based on a plurality of consecutive frames acquired by the driver camera 3, and stores the calculated pupil diameter PD in correspondence with each frame as pupil diameter information in the memory in the processing unit 7. The pupil diameter PD of the driver D varies between approximately 2 mm and 8 mm according to changes in the brightness around the vehicle (for example, see the reference document "Vision 1 Structure and Initial Function of the Visual System", P19, a graph showing the relationship between brightness and pupil diameter). In the present embodiment, changes in brightness felt by the driver D are detected based on changes in the pupil diameter PD of the driver D.

[0034] The brightness adjustment unit 13 adjusts the brightness of the virtual image S based on the illuminance detected by the illuminance sensor 2 , the age estimated by the age estimation unit 11 , and the pupil diameter PD calculated by the pupil diameter calculation unit 12 . Specifically, when a coefficient pre-set according to age, i.e., an age distinction coefficient which becomes relatively smaller as the age increases and relatively larger as the age decreases, is set to "y", the reference frame number is set to "X", and the frame number for age adjustment calculation obtained by multiplying the reference frame number X by the age distinction coefficient y is set to "Z", the average value of the pupil diameter PD of the amount of the age adjustment calculation frame number Z is set to "Φave" [mm], the minimum value of the pupil diameter PD pre-conceived is set to "Φmin" [mm], the maximum value of the pupil diameter PD pre-conceived is set to "Φmax" [mm], and the value expressed as a percentage of the illuminance detected by the illuminance sensor 2 relative to the maximum value of the illuminance that can be detected by the illuminance sensor 2 is set to "Q" [%], the brightness adjustment unit 13 adjusts the brightness of the virtual image based on the adjustment value V [%] calculated by the following formula (1).

[0035] [Formula 1]

[0036]

[0037] For example, Figure 4 As shown, the age classification coefficient y is "1.0" for "~20s" (under 29 years old), "0.9" for "30s" (30-39 years old), "0.8" for "40s" (40-49 years old), "0.7" for "50s" (50-59 years old), "0.6" for "60s" (60-69 years old), and "0.5" for "70s~" (over 70 years old). The dark adaptation time of the vision of driver D slows down as he ages (for example, refer to "International Institute for Traffic Safety: Research on the Causes of Accidents among Older Drivers", https: / / www.iatss.or.jp / common / pdf / research / h494.pdf, P12, Figure 2 .2-2, a graph showing the progression of aging and dark adaptation), so Figure 5 As shown, for example, when the vehicle 100 moves from a bright place to a dark place, the display of the virtual image S visually recognized by the driver D may be too bright and make it difficult for the driver D to see the front. Figure 5The bright place shown is, for example, the outside of the tunnel T during the daytime on a sunny day, and the dark place is inside the tunnel T. Therefore, in the present embodiment, in order to cope with the changes in dark adaptation caused by aging, different values ​​of age distinction coefficients y are set according to age. The age distinction coefficient y is a coefficient set in advance according to age, and is relatively small if the age is old and relatively large if the age is young. For example, when the driver D is 20 years old, y=1.0, and when the driver D is 70 years old, y=0.5. In addition, the change in adaptation time caused by aging slows down not only in dark adaptation, but also in light adaptation, so the age distinction coefficient y shown in the figure is used.

[0038] The reference frame number X is a smoothing degree arbitrarily set by a system designer in order to smooth the change of pupil diameter PD over time. The reference frame number X adopts a value of about 2 to several tens.

[0039] The age adjustment calculation frame number Z is obtained by multiplying the reference frame number X by the age classification coefficient y. For example, when the reference frame number X=10, Z=10 when the driver D is 20 years old, and Z=5 when the driver D is 70 years old.

[0040] The average value Φave [mm] of the pupil diameter PD for the number of frames Z for age adjustment calculation is, for example, assuming that the plurality of pupil diameters PD for the number of frames Z for age adjustment calculation is “PD 1 , P.D. 2 ,…,PD z ”(Z=1,2,…,Z),Φave[mm] becomes PD 1 +PD 2 +···+PDz / Z.

[0041] The pre-assumed minimum value Φmin [mm] of the pupil diameter PD is the minimum value of the pupil diameter PD of the driver D that changes between 2 and 8 mm in accordance with the above-mentioned change in the brightness around the vehicle, and is, for example, 2 mm.

[0042] The maximum value Φmax [mm] of the pupil diameter PD assumed in advance is the maximum value of the pupil diameter PD of the driver D which varies between 2 and 8 mm in accordance with the above-mentioned change in the brightness around the vehicle, and is, for example, 8 mm.

[0043] The brightness adjustment value V of the virtual image S is a value obtained by averaging P and Q, which is a value obtained by averaging the illuminance detected by the illuminance sensor 2 as a percentage relative to the maximum value of the illuminance detectable by the illuminance sensor 2, when the average value Φave of the pupil diameter PD for the age adjustment calculation frame number Z is expressed as a percentage relative to the minimum value (Φmin) and the maximum value (Φmax) of the pupil diameter PD assumed in advance, described later. The illuminance adjustment value V of the virtual image S changes the response of the brightness adjustment of the virtual image S according to the change of the light and dark state around the vehicle based on the illuminance detected by the illuminance sensor 2. For example, when the age of the driver D is relatively old, the brightness adjustment value V of the virtual image S becomes a value at which the response of the brightness adjustment of the virtual image S to the change of the detected illuminance is relatively fast. On the other hand, when the age of the driver D is relatively young, the brightness adjustment value V of the virtual image S becomes a value at which the response of the brightness adjustment of the virtual image S to the change of the detected illuminance is relatively slow.

[0044] The image output unit 14 drives and controls the TFT liquid crystal display of the display device 6, for example, and outputs a display image that the driver D visually recognizes as a virtual image S through the display device 6. The image output unit 14 outputs a display image adjusted by the brightness adjustment unit 13 based on the adjustment value V of the brightness of the virtual image S through the display device 6.

[0045] Next, refer to Figure 3 The flowchart shown describes the flow of brightness adjustment control of the virtual image S in the vehicle display device 1. The vehicle display device 1 is activated when the ACC power supply of the vehicle 100 is turned on, and repeatedly performs the processing described below until the power supply is turned off.

[0046] In step S1 , the age estimation unit 11 estimates the age of the driver D based on the facial image captured by the driver camera 3 , and stores the estimated age in a memory as age information.

[0047] Next, in step S2 , the brightness adjustment unit 13 stores the illuminance detected by the illuminance sensor 2 in the memory as illuminance information.

[0048] Next, in step S3, the pupil diameter calculation unit 12 detects the pupil E of the driver D based on the face image captured by the driver camera 3, and calculates the pupil diameter PD of the pupil E. The pupil diameter calculation unit 12 stores the calculated pupil diameter PD in a memory as pupil diameter information.

[0049] Next, in step S4 , the brightness adjustment unit 13 reads the age information, the illuminance information, and the pupil diameter information from the memory, substitutes them into the above-mentioned equation (1) to calculate the adjustment value V, and stores the calculated adjustment value V in the memory.

[0050] Next, in step S5 , the brightness adjustment unit 13 reads the adjustment value V stored in the memory in step S4 , and adjusts the brightness of the virtual image S based on the adjustment value V. The image output unit 14 outputs the display image adjusted by the brightness adjustment unit 13 .

[0051] In step S6, the brightness adjustment unit 13 determines whether to terminate the present process. If the present process is not terminated, the process returns to step S2. For example, in step S6, when the ACC power supply of the vehicle 100 is disconnected, the processing unit 7 terminates the present process according to the disconnection signal input from the vehicle 100 side.

[0052] Through the above-mentioned processing, the brightness adjustment unit 13 calculates the adjustment value V according to the change of the light and dark state of the vehicle surroundings based on the illuminance detected by the illuminance sensor 2 based on the age estimated by the age estimation unit 11 and the pupil diameter calculated by the pupil diameter calculation unit 12, and uses the adjustment value V to adjust the brightness of the virtual image S. As a result, when the vehicle surroundings change from a bright state to a dark state, when the age of the driver D is relatively old, the brightness of the virtual image S can be relatively darkened compared to the relatively young driver D. On the other hand, when the vehicle surroundings change from a dark state to a bright state, when the age of the driver D is relatively old, the brightness of the virtual image S can be relatively brightened compared to the relatively young driver D.

[0053] As described above, in the vehicle display device 1 involved in the present embodiment, the brightness adjustment unit 13 relatively speeds up the response of the brightness adjustment of the virtual image S to the change in the detected illuminance based on the change in the light and dark state around the vehicle based on the illuminance detected by the illuminance sensor 2 when the age of the driver D estimated by the age estimation unit 11 is relatively old, and relatively slows down the response of the brightness adjustment of the virtual image S to the change in the detected illuminance when the age of the driver D is relatively young.

[0054] Regarding the conventional brightness adjustment of the virtual image S, for example, during a sunny day, the vehicle 100 passes through a tunnel T (see Figure 5 ), when the surroundings of the vehicle change from a bright state to a dark state, the brightness of the virtual image S1 is relatively darkened, and when the surroundings of the vehicle change from a bright state to a dark state, the brightness of the virtual image S2 is relatively darkened.

[0055] The vehicle display device 1 is configured as described above. For example, when the vehicle 100 passes through the tunnel T (see FIG. 1 ) during the daytime on a sunny day, the vehicle 100 can be displayed. Figure 5), when the vehicle surrounding changes from a bright state to a dark state, when the age of the driver D is relatively old, the brightness of the virtual image S becomes darker relatively quickly compared to the relatively young driver D, and the situation that the virtual image S projected overlapping with the actual scene is too bright and difficult to see the front can be reduced. On the other hand, when the vehicle surrounding changes from a dark state to a bright state, when the age of the driver D is relatively old, the brightness of the virtual image S becomes brighter relatively quickly compared to the relatively young driver D, and the situation that the virtual image S projected overlapping with the actual scene is too dark and difficult to see can be reduced. As a result, the commercial quality of the vehicle display device 1 can be improved.

[0056] In addition, in the vehicle display device 1 according to the present embodiment, the brightness adjustment unit 13 adjusts the brightness of the virtual image S based on the adjustment value V[%] calculated by the above formula (1). As described above, the vehicle display device 1 can reduce the situation where the virtual image S is relatively too bright and difficult to see the front, or the virtual image S is too dark and difficult to see, when the driver D drives the vehicle 100 through the tunnel T, so as to improve the marketability of the device.

[0057] In addition, in the vehicle display device 1 according to the present embodiment, the age estimation unit 11 estimates the age of the driver D based on the facial image captured by the driver camera 3. This can save the driver D from having to operate the device to input his or her age, for example, and can improve the convenience of the driver D. In addition, by suppressing the erroneous input of the driver D's age, the function of the device can be effectively exerted.

[0058] In the above embodiment, the age estimation unit 11 estimates the age of the driver D based on the facial image captured by the driver camera 3 , but the present invention is not limited thereto. For example, the age estimation unit 11 may be configured to allow the driver D to directly input his age.

[0059] In the above embodiment, as described above, the vehicle display device 1 is activated when the ACC power supply of the vehicle 100 is turned on, and repeatedly performs Figure 3 The processing shown continues until the power supply etc. is turned off.

[0060] In the above embodiment, the illuminance sensor 2 is provided exclusively for the vehicle display device 1 , but the present invention is not limited thereto, and an illuminance sensor provided for automatic lighting of the headlights of the vehicle 100 may also be used.

[0061] In addition, in the above-mentioned embodiment, the driver camera 3 is provided on the steering column, but the present invention is not limited thereto, and the driver camera 3 may be provided on the instrument panel, the control panel, the interior mirror, or the like.

[0062] Furthermore, in the above-described embodiment, the housing 4 accommodates the three reflectors 5A to 5C, but the number is not limited to this.

[0063] Furthermore, in the above-described embodiment, the vehicle display device 1 is applied to a vehicle 100 such as an automobile, but the present invention is not limited thereto and may be applied to, for example, a ship, an airplane, etc. other than a vehicle.

[0064] Description of Reference Numerals

[0065] 1Vehicle display device

[0066] 2 Illuminance sensor (illuminance detection unit)

[0067] 3. Driver's camera (photography unit)

[0068] 6Display device (image display unit)

[0069] 11Age estimation unit (age acquisition unit)

[0070] 12Pupil diameter calculation unit

[0071] 13Brightness adjustment unit (adjustment unit)

[0072] 14 Image output unit

[0073] 100 Vehicles

[0074] D. Driver

[0075] E Pupil

[0076] S, S1, S2 virtual image

[0077] W Windshield (projected part)

Claims

1. A vehicle display device, characterized in that: have: an image display unit that projects a display image onto a projection component of a vehicle so that a driver of the vehicle can visually recognize a virtual image corresponding to the display image projected onto the projection component; an illumination detection unit configured to detect illumination around the vehicle; an age acquisition unit, the age acquisition unit acquiring the age of the driver; as well as an adjustment unit configured to adjust the brightness of the virtual image based on the illuminance detected by the illuminance detection unit and the age acquired by the age acquisition unit, The adjustment unit performs the following processing according to a change in the brightness and darkness of the surroundings of the vehicle based on the illuminance detected by the illuminance detection unit: When the age of the driver acquired by the age acquisition unit is relatively old, the response of the brightness adjustment of the virtual image to the change in the detected illuminance is made relatively fast, When the driver is relatively young, the response of the brightness adjustment of the virtual image to the detected change in the illuminance is made relatively slow.

2. The vehicle display device according to claim 1, characterized in that: Also available: a photographing unit configured to photograph the driver's face; and a pupil diameter calculation unit that detects the driver's pupil based on the image captured by the imaging unit and calculates the pupil diameter of the detected pupil, When a coefficient pre-set according to age, i.e., an age discrimination coefficient which becomes relatively smaller as the age increases and relatively larger as the age decreases, is set as "y", a reference frame number is set as "X", and the age adjustment calculation frame number obtained by multiplying the reference frame number X by the age discrimination coefficient y is set as "Z", an average value of the pupil diameter corresponding to the age adjustment calculation frame number Z is set as "Φave" [mm], a pre-conceived minimum value of the pupil diameter is set as "Φmin" [mm], a pre-conceived maximum value of the pupil diameter is set as "Φmax" [mm], and a value expressed as a percentage of the illuminance detected by the illuminance detection unit relative to the maximum value of the illuminance detectable by the illuminance detection unit is set as "Q" [%], the adjustment unit adjusts the brightness of the virtual image based on the adjustment value V [%] calculated by the following formula (1), [Formula 1] 3. The vehicle display device according to claim 1 or 2, characterized in that: The age acquisition unit includes at least estimating the age of the driver based on the image captured by the imaging unit.

Images