JP2020199886A - Head-up display device and head-up display system - Google Patents

Abstract

To provide a head-up display device in which a driver can visually recognize information easily.SOLUTION: A head-up display device provided with a head lamp in a vehicle comprises: a light source which can change the correlation color temperature of the emitted white light; a control unit which adjusts the correlation color temperature of the white emission light of the light source; and a projection unit which forms the white emission light of the light source as video light and projects the video light to a projection object member arranged on the front side of a driver seat to display a virtual image so as to be overlapped on the scenery for a driver. A control device adjusts the correlation color temperature of the white emission light of the light source in accordance with the correlation color temperature of the irradiation light of the head lamp. Concretely, by providing a difference equal to or greater than 1000 K in the correlation color temperature between the irradiation light of the head lamp and the video light by the head-up display device, the difference in the hue between two lights can be made clear, and the driver can visually recognize the information easily even when the light distribution and the video light (virtual image) overlap each other.SELECTED DRAWING: Figure 1

Description

The present invention relates to a head-up display device and a head-up display system mounted on a vehicle.

Conventionally, there is a head-up display device as one of means for providing information such as route guidance and obstacle warning to a vehicle driver (for example, Patent Document 1). The head-up display device projects an image light onto a projected member arranged in front of the driver to superimpose the image light on the landscape and display a virtual image on the driver. As a result, the movement of the line of sight when visually recognizing information can be minimized.

JP 2016-55691

However, since the driver visually recognizes the virtual image by superimposing it on the landscape in front of the vehicle, when the image light of the head-up display device (the virtual image) is superimposed on the irradiation light of the headlamp, both the irradiation light and the image light are basically. Since it is white light, the image light becomes a protective color for the irradiation light and may be difficult to see.

The present invention has been made in view of this, and provides a head-up display device and a head-up display system in which a driver can easily visually recognize information.

In order to achieve the above object, in one aspect according to the configuration of the present disclosure, a head-up display device provided in a vehicle together with a head lamp, a light source capable of changing the correlated color temperature of emitted white light, and the light source. A control unit that adjusts the correlated color temperature of the white emitted light and the white emitted light of the light source are formed as image light and projected onto a projected member arranged in front of the driver's seat to create a landscape for the driver. The control device includes a projection unit that superimposes and displays a virtual image, and the control device is configured to adjust the correlated color temperature of the white emitted light of the light source according to the correlated color temperature of the irradiation light of the head lamp. According to this aspect, the image light of the head-up display device and the irradiation light of the headlamp can be different in color even if the basic light is white, so that the display by the head-up display device is used. It is possible to improve the discriminating power of information.

In some embodiments, the control unit is configured to adjust the correlated color temperature of the white emitted light of the light source to be different by 1000 K or more with respect to the correlated color temperature of the irradiation light of the headlamp. According to this aspect, it is possible to make a difference in the correlated color temperature between the image light and the irradiation light so that the driver can clearly recognize the difference in color, so that the image light, which is necessary information, has a reliable discriminating power. Can be given.

Further, in one embodiment, the control unit is configured to adjust the correlated color temperature of the white emitted light of the light source to 4000 K or less. According to this aspect, the image light produced by the head-up display device has a slightly yellowish color, and the headlamp is usually white light that is easy to see. Therefore, the image light can be identified while ensuring the visibility of the headlamp. You can increase your strength.

In some embodiments, the control unit is configured to adjust so that the correlated color temperature of the white emitted light of the light source is always lower than the correlated color temperature of the irradiation light of the headlamp. According to this aspect, the higher the correlated color temperature of the irradiation light by the head lamp, the easier it is to secure the visibility in front of the vehicle, and the lower the correlated color temperature, the less eye fatigue. Therefore, the color of the irradiation light of the head lamp By lowering the correlated color temperature of the image light when making a difference in color while keeping the taste, it is possible to use the advantages of both in a well-balanced manner.

In some embodiments, the control unit is configured to adjust the correlated color temperature of the white emitted light of the light source only when the headlamp is lit. According to this aspect, when the headlamp is not turned on and there is no concern that the image light and the irradiation light of the headlamp overlap, when white with high discriminating power is used for the image light and the headlamp is turned on. It is possible to accurately adjust the correlated color temperature according to the situation, such as making a difference in color.

In some embodiments, the head-up display device is configured to supply light emitted from a light engine configured as a common light source with the headlamps via a light guide. According to this aspect, by using the light engine as a common light source, the cooling function and the like can be integrated in one place, and the correlated color temperature can be efficiently controlled by relating the headlamp and the head-up display device. it can.

In some embodiments, the control unit determines the correlated color temperature of the white emitted light of the light source according to the correlated color temperature of the irradiation light of the headlamp and the object color of the object to be irradiated by the irradiation light of the headlamp. It was configured to adjust. According to this aspect, the visibility of the information on the head-up display can be further improved.

Further, as another aspect according to the configuration of the present disclosure, a head-up display system mounted on a vehicle, a head lamp that illuminates the front of the vehicle, a light source that can change the correlated color temperature of the emitted white light, and the above. A control unit that adjusts the correlated color temperature of the white emitted light of the light source and the white emitted light of the light source are formed as image light and projected onto a projected member arranged in front of the driver to the driver. A head-up display device having a projection unit that superimposes a landscape and displays a virtual image is provided, and the control unit changes the correlated color temperature of the white emitted light of the light source to the correlated color temperature of the irradiation light of the head lamp. It provides a head-up display system that adjusts accordingly. According to this aspect, since the color of the light can be different as described above, the discriminating power of the display information by the head-up display device can be improved.

As is clear from the above description, according to the present invention, it is possible to provide a head-up display device and a head-up display system in which a driver can easily visually recognize information.

It is the schematic for demonstrating the head-up display apparatus which concerns on this invention. It is sectional drawing for demonstrating the structure of the head-up display apparatus. It is a front view of the light source module provided in the head-up display device. It is sectional drawing along the IV-IV line of FIG. It is a figure which shows the XY chromaticity diagram. It is a block diagram of a head-up display device. It is explanatory drawing of the correlation color temperature. It is the schematic for demonstrating the head-up display system as another embodiment. It is a block diagram of a head-up display system.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The embodiments are not limited to the invention, but are exemplary, and all the features and combinations thereof described in the embodiments are not necessarily essential to the invention.

In each figure, assuming that the driver is viewed from the driver's seat of the vehicle, each direction of the vehicle and components (upper: lower: left: right: front: rear = Up: Lo: Le: Ri). : Fr: Re) will be described.

(Overview of head-up display device)
FIG. 1 is an explanatory diagram showing an outline of the head-up display device 20 according to the first embodiment of the present invention. The head-up display device 20 is mounted on the vehicle C provided with the headlamp 10.

The headlamp 10 forms the irradiation light B2 emitted from the provided light source into a desired light distribution pattern such as low beam light distribution or high beam light distribution, and projects the irradiation light B2 to the front of the vehicle C. Conventionally known configurations such as a projector type and a reflector type are used, and the type does not matter.

The head-up display device 20 has a light source module 30, and the light source module 30 emits white light B1. As will be described in detail later, the correlated color temperature of the white light B1 emitted from the light source module 30 is configured to be adjustable.

The head-up display device 20 is used in a predetermined display area of the projected member provided in front of the driver's seat (in the present embodiment, a predetermined area of the windshield 50), and various types of traveling that are effective mainly for the driving operation of the driver D. The image of the information is projected as image light formed by the white light B1 and displayed so as to superimpose the scenery seen through the windshield 50 from the driver's seat.

Hereinafter, the image formed by the light projected by the head-up display device 20 (visible to the driver D as a virtual image) is referred to as video light.

The right side of FIG. 1 shows an example of implementation of the head-up display device 20. The high beam light distribution A is formed by the headlamp 10 and projected in front of the vehicle C, and the arrow M, which is an image light indicating the traveling direction, is projected on the windshield 50 by the head-up display device 20. The driver D superimposes the arrow M on the landscape in front of the vehicle C through the windshield 50 and visually recognizes the arrow M as a virtual image.

Here, the landscape in front of the vehicle C is illuminated by the high beam light distribution A, in other words, the driver D superimposes on the high beam light distribution A and visually recognizes the arrow M.

Since the basic color of both the arrow M formed by the white light B1 and the high beam light distribution A formed by the irradiation light B2 is the same white, the irradiation light B2 is used in order to avoid obscuring the visibility due to the protective color. The correlated color temperature of the white light B1 is adjusted according to the correlated color temperature.

With this configuration, the difference in color of the arrow M with respect to the high beam light distribution A becomes clear, and the arrow M, which is useful information, is shown in a form that is easily visible to the driver D.

(Configuration of head-up display device)
FIG. 2 is a cross-sectional view showing the configuration of the head-up display device 20. The head-up display device 20 is housed in the housing 21 and installed in front of the driver's seat such as a dashboard. A scanning mechanism 22, a light source module 30, a control unit 24, and a projection lens 25 are housed in the housing 21 as components.

The projection lens 25 is a plano-convex aspherical lens in which the entrance surface on the bottom surface side is flat and the exit surface on the top surface side is a convex surface, and a windshield of a desired image light formed by the scanning mechanism 22 having a specific size. It is provided so as to project onto a predetermined display area on the 50. An opening 21a is provided on the upper wall of the housing 21 to allow light from the projection lens 25 to pass through. A translucent cover 21b that transmits light may be provided so as to cover the opening 21a.

The scanning mechanism 22 is a scanning device having a reflector capable of tilting in two axes. The scanning mechanism 22 is arranged at a position where the white light B1 emitted from the light source module 30 can be reflected by the reflecting mirror on the projection lens 25, and the white light B1 scans the incident surface of the projection lens 25 at high speed by the reciprocating motion of the reflecting mirror. To do. The control unit 24 controls the tilt of the scanning mechanism 22 and controls the lighting of the light source module 30 in accordance with the scanning of the white light B1, so that desired image light is formed by stacking the lights.

The image light thus formed is inverted vertically and horizontally through the projection lens 25 and projected onto the windshield 50, and is visually recognized by the driver D as a virtual image formed in front of the vehicle C. As a result, the driver D can visually recognize the vehicle C from the traveling path without moving the line of sight.

The control unit 24 controls the head-up display device 20 for determining the shape and position of the image light to be formed, adjusting the lighting timing and brightness of the light source module 30, and controlling the driving direction and speed of the reflecting mirror of the scanning mechanism 22. Control in an integrated manner.

In the present embodiment, the scanning mechanism 22 is used for the head-up display device 20, but the present invention is not limited to this, and other conventionally known mechanisms such as a plurality of light sources can be used as long as arbitrary image light can be formed by light. Other configurations such as a pixel optical device such as an LED array or a liquid crystal shutter arranged in a matrix, or a light deflector such as a DMD (Digital Mirror Device) may be used.

(Light source module)
The light source module 30 will be described in detail. FIG. 3 is a view of the light source module 30 as viewed from the front of the vehicle C (that is, from the FR direction). FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG.

The light source module 30 includes a substrate 31, four first LED elements (light emitting elements) 32a to 32d, four second LED elements 34a to 34d, a wavelength conversion member 36, and a reflection member 38. Hereinafter, when the first LED elements 32a to 32d are collectively referred to, or when there is no particular distinction, they are simply referred to as "first LED element 32". Similarly, when the second LED elements 34a to 34d are collectively referred to, or when no particular distinction is made, they are simply referred to as "second LED element 34".

The substrate 31 is formed in a flat plate shape by a material having high thermal conductivity. The four first LED elements 32a to 32d and the four second LED elements 34a to 34d are arranged on the substrate 31. That is, they are arranged on the same substrate 31.

The first LED element 32a, the second LED element 34b, the first LED element 32c, and the second LED element 34d are arranged on the substrate 31 so as to be arranged in the left-right direction in this order. Further, in parallel with these, the second LED element 34a, the first LED element 32b, the second LED element 34c, and the first LED element 32d are arranged on the substrate 31 so as to be arranged in the left-right direction in this order. As a result, the first LED element 32 is adjacent to the second LED element 34 in the left-right direction and the up-down direction. Therefore, naturally, the second LED element 34 is adjacent to the first LED element 32 in the left-right direction and the up-down direction.

The first ED element 32 is an LED element that emits blue light having a main wavelength in the wavelength range of 420 to 485 nm. The second LED element is an LED element that emits amber-colored light having a main wavelength in the wavelength range of 577 to 587 nm.

The wavelength conversion member 36 is arranged on the optical path of the four first LED elements 32a to 32d and the four second LED elements 34a to 34d. In the present embodiment, the wavelength conversion member 36 faces the light emitting surfaces 32a'to 32d'of the four first LED elements 32a to 32d and the light emitting surfaces 34a' to 34d' of the four second LED elements 34a to 34d. Is placed in.

The wavelength conversion member 36 converts a part of the blue light emitted by the first LED element 32 into yellow light having a main wavelength in the wavelength range of 550 to 570 nm, and at least the blue light emitted by the first LED element 32. Make a part transparent. Further, the wavelength conversion member 36 substantially transmits the amber-colored light emitted by the second LED element 34. For example, the wavelength conversion member 36 may transmit 50% or more of the amber-colored light emitted by the second LED element 34.

Specifically, the wavelength conversion member 36 contains a phosphor. This phosphor absorbs a part of the blue light emitted by the first LED element 32 and emits yellow light to lumbar cyan. At least a part of the blue light emitted by the first LED element 32 is emitted from the wavelength conversion member 36 without being absorbed by the phosphor. Further, the amber-colored light emitted by the second LED element 34 is emitted from the wavelength conversion member 36 without being substantially absorbed by the phosphor (for example, 70% or more is not absorbed by the phosphor). The amber-colored light emitted by the second LED element 34 is particularly diffused by the phosphor and emitted from the wavelength conversion member 36.

The blue light transmitted through the wavelength conversion member 36 and the light converted to yellow by the wavelength conversion member 36 are mixed to generate white light. In the present embodiment, the white light is further mixed with amber-colored light transmitted through the wavelength conversion member 36. Here, the correlated color temperature of the white light can be changed by changing the brightness of the amber color mixed with the white light. The brightness is changed by adjusting the amount of drive current flowing through the LED element or changing the number of LED elements to emit light.

The reflecting member 38 reflects the light from the LED element. As a result, the light that reaches the reflection member 38 without going to the wavelength conversion member 36 is also reflected and used as the irradiation light. Therefore, the utilization efficiency of the light source module 30 is improved.

The light emitted from each LED element is collected by a condenser lens arranged in front of the wavelength conversion member 36 and emitted forward as white light B1. The light source module 30 is an example, and other configurations may be used as long as the correlated color temperature of the emitted light can be adjusted.

FIG. 5 shows an XY chromaticity diagram. In FIG. 5, the rectangular region R indicates the white standard range of the headlamp (approximately 3000K to 7000K at the correlated color temperature).

Graph B shows a blackbody radiation trajectory. The chromaticity point P1 indicates the chromaticity point of white light based on the first LED element 32 and the wavelength conversion member 36, and the chromaticity point P2 indicates the chromaticity point of the amber light from the second LED element 34. There is. The correlated color temperature of the chromaticity point P1 is 6000K to 7200K, and the main wavelength of the chromaticity point P2 is 577 nm to 587 nm. By changing the mixing ratio of the white light and the amber light, the correlated color temperature can be arbitrarily adjusted on the straight line connecting the chromaticity point P1 and the chromaticity point P2.

As is clear from FIG. 5, the correlated color temperature can be adjusted within the region R, particularly along the sunspot radiation locus.

(Block Diagram)
FIG. 6 is a block diagram of the head-up display device 20. The data S1 is the correlated color temperature of the irradiation light B2 of the headlamp 10. The headlamp 10 is provided with a correlated color thermometer, or the correlated color temperature of the light source used for the headlamp 10 is input. Yellow halogen (3000K ~) / white valve (4000-5000K) / blue HID (5000K ~) The correlated color temperature data S1 of the irradiation light B2 of the headlamp 10 is configured to be available by means (not shown) such as designating the range of the correlated color temperature of the headlamp by a changeover switch such as).

Correlated color temperature data S1 of the irradiation light B2 of the headlamp 10, data S2 indicating a running state transmitted from the in-vehicle device, and ambient environment data S3 of the vehicle C are input to the control unit 24. The data S2 includes vehicle speed, lamp switch signal, continuous driving time, etc., and S3 includes navigation information, rainfall conditions, road conditions, and the like.

The light source module 30 is provided with two drive circuits 39a and 39b. The drive circuit 39a supplies the drive current Ia to the first LED element 32, and the drive circuit 39b supplies the drive current Ib to the second LED element 34. As a result, the first LED element 32 and the second LED 34 emit light.

Based on the data S1 to S3, the control unit 24 determines the image light to be formed and its projection position, and generates the lighting control signal S4 of the light source module 30, the dimming signal S5, and the control signal S6 of the scanning mechanism 22.

The drive circuits 39a and 39b supply the drive currents Ia and Ib corresponding to the dimming signal S5 to the first LED element 32 and the second LED element 34. The brightness of each LED element is determined by the current values of the drive currents Ia and Ib. Further, the drive circuits 39a and 39b supply / stop supplying / stopping the drive currents Ia and Ib by the lighting control signal S4.

The mixed color light of the white light emitted by the first LED element 32 emitted by the drive current Ia and the amber light emitted by the second LED element 34 similarly emitted by the drive current Ib is used as the white light B1 having a desired correlation color temperature in the light source module. It emits light from 30 and enters the scanning mechanism 22.

The scanning mechanism 22 is controlled by the control signal S6, and the white light B1 is scanned at high speed by a tilting reflector to form a desired image light by a line image.

The control unit 24 adjusts the correlated color temperature of the white light B1 emitted by the light source module 30 according to the correlated color temperature of the irradiation light B2 emitted by the headlamp 10. This is to improve the visibility of the image light projected by the head-up display device 20 by making a difference in the color of the light.

FIG. 7 shows the correlated color temperature of light emitted from an ideal blackbody (blackbody radiation). As shown in FIG. 7, when the correlated color temperature is low, it becomes reddish, and when the correlated color temperature is high, it becomes pale. Since the image light projected by the head-up display device 20 is formed by the white light B1, the correlated color temperature of the image light is the same as the correlated color temperature of the white light B1. Further, the correlated color temperature of the light distribution pattern formed by the irradiation light B2 emitted from the headlamp 10 is the same as the correlated color temperature of the irradiation light B2.

Here, the process returns to FIG. 1 and will be described with reference to the embodiment shown on the right side of FIG. As shown in FIG. 1, the arrow M, which is the image light, is visually recognized superimposing on the landscape irradiated by the high beam light distribution A. As described above, at least a part of the irradiation light of the headlamp 10 and the image light may overlap in the driver D viewpoint (eye range). Since both the high beam light distribution A and the arrow M are basically white, avoid that the arrow M, which is necessary information for the driver D, becomes the protective color of the high beam light distribution A and becomes difficult to see. , The control unit 24 controls the light source module 30.

Specifically, the correlated color temperature of the white light B1 of the light source module 30 is adjusted to be different by 1000 K or more with respect to the correlated color temperature of the irradiation light B2 of the headlamp 10. By making a difference of 1000K or more in the correlated color temperature, there is a clear difference in the tint between the white light B1 and the irradiation light B2, and the assimilation of the tint prevents the visibility from being significantly reduced. It becomes possible to identify M reliably.

The correlated color temperature of the white light B1 is preferably lower than the correlated color temperature of the irradiation light B2. This is because the bluish light is recognized as stronger light in terms of visibility from the human eye, so visibility in front of vehicle C is ensured and at the same time visibility from other vehicles. In order to improve the above, it is better to allocate the light having a high correlated color temperature to the headlamp 10 to improve the overall performance of the vehicle C and the comfort of the driver D.

At the same time, reddish light with a low correlated color temperature has the effect of relieving eye fatigue. Therefore, when making a difference in color, the color of the irradiation light B2 of the head lamp 10 remains the same, and the arrow indicates. By lowering the correlated color temperature of the white light B1 forming M, the driver D's feeling of fatigue can be reduced, the visibility of the arrow M can be ensured, and the advantages of both can be utilized in a well-balanced manner.

At this time, the correlated color temperature of the white light B1 is preferably 4000 K or less. The white light B1 becomes reddish light, and the driver D's feeling of eye fatigue is alleviated.

Such adjustment of the correlated color temperature of the white light B1 may be performed only when the headlamp 10 is lit. The lighting signal of the headlamp 10 is input to the control unit 24 as data S2, and the control unit 24 is configured to start adjusting the correlated color temperature by using this as a trigger, so that the video light and the light distribution overlap. If there is no concern that it will be visually recognized, the correlation color temperature will not be adjusted.

Further, when the headlamp 10 is not used such as during the daytime, the correlated color temperature in front of the vehicle C may be acquired and input to the control unit 24 as data S1 to adjust the correlated color temperature of the white light B1. .. The discriminating power of the image light of the head-up display device 20 can be kept high at any time.

Further, it is preferable to configure the headlamp 10 to detect the object color and the correlated color temperature of the object by the irradiation light of the headlamp 10 and adjust the color temperature of the white light B1 accordingly. By adding the object color of the object to be irradiated by the irradiation light B2 and changing the color temperature to the similar color side or the opposite color side of the object, the object is made to stand out, and vice versa. You can also. For example, when the object to be irradiated is blue, the visibility of the image light can be improved by the complementary color effect by lowering the correlated color temperature of the white light B1 to make it yellowish. With this configuration, the discriminating power of the image light can be further enhanced, the driver's glare and blindness can be prevented, and the drivability can be improved.

(Second Embodiment)
FIG. 8 shows a second embodiment of the present invention. Elements having the same configuration as that of the first embodiment are designated by the same reference numerals, and description thereof will be omitted.

In the second embodiment, the head-up display system 100 includes a head-up display device 120, a headlamp 110, and a light engine 130 as a common light source thereof.

The light engine 130 includes two light source modules 30, and the two light source modules 30 are independently and collectively controlled by the control unit 24. The boards 31 of the two light source modules 30 are standardized, all LED elements are arranged on the only board 31, and a heat sink is provided on the rear surface of the boards 31.

The head-up display device 120 does not include a dedicated light source module 30 in the housing 21, but instead transmits white light B1 formed by one of the light source modules 30 provided in the light engine 130 via a light guide body including an optical fiber. It has the same configuration as that of the first embodiment except that it is supplied.

Similarly, the headlamp 110 is formed by the other light source module 30 provided in the light engine 130 instead of the light source, and forms a desired light distribution pattern by using the irradiation light B2 supplied via the light guide. The configuration is the same as that of the first embodiment except that the light source is projected.

In the present embodiment, the light engine 130 is provided with two light source modules 30, and is configured to supply light to the head-up display device 120 and the headlamp 110 via a light guide, respectively. Not limited to this, it may be configured to supply light to other vehicle lighting fixtures such as fog lamps, blinkers, interior lights, and brake lamps. The light engine 130 is configured to have as many light source modules 30 as the number of connected vehicle lamps, and the control unit 24 independently controls the supply of light to each vehicle lamp. In that case, it is preferable to use not only the light source module 30 but also a light source suitable for a lamp that supplies light, such as a halogen bulb or a laser diode.

By storing the light source of the vehicle lighting equipment in one place using the light engine 130 in this way, the temperature adjustment and cooling design performed for each vehicle lighting equipment can be completed only in one place of the light engine 130. As a result, the design man-hours can be reduced. In addition, the temperature can be adjusted efficiently, and the number of parts can be reduced by standardizing the parts.

FIG. 9 is a block diagram of the head-up display system 100. The control unit 24 generates signals S4'and S5'that control one light source module 30 and signals S4'and S5' that control the other light source module 30 from the data S1 to 3. White light B1 is formed from one light source module 30 and guided to the scanning mechanism 22, and irradiation light B2 is formed from the other light source module and guided to the headlamp 110.

Further, in the present embodiment, the LED elements are individually supplied with the drive current from the drive circuit. With this configuration, the drive current to be supplied can be set individually, and more accurate and more detailed brightness adjustment can be performed.

Here, returning to FIG. 5 and explaining, since the rectangular region R indicates the white standard range of the headlamp, the control unit 24 sets the correlated color temperature of the irradiation light B2 supplied to the headlamp 110 within the region R. The light source module 30 is controlled so as to fit.

Since not only the white light B1 of the head-up display device 120 but also the correlated color temperature of the irradiation light B2 of the headlamp 110 is controlled by the control unit 24, both can be controlled in relation to each other.

For example, in rainy weather, the correlated color temperature of the irradiation light B2 of the headlamp 110 can be set to about 3000 K, and the correlated color temperature of the white light B1 of the head-up display device 120 can be set to 4000 K or more correspondingly. This is because white light with a high correlated color temperature hits rainy water drops and diffuses to reduce visibility, but yellowish light with a low correlated color temperature is more likely to be seen. This is because, by configuring in this way, it is possible to secure the visibility of the image light while improving the visibility in rainy weather.

In addition, when driving on a highway, that is, when the speed data obtained by the speedometer exceeds a predetermined value, adjustments are made to raise the correlated color temperature of the irradiation light B2 in order to improve visibility in the distance, or continuous operation time. When the data in the above exceeds a predetermined value, the light distribution by the headlamp 110 is performed based on the data S1 to S3, such as adjusting to lower the correlated color temperature of the irradiation light B2 in order to alleviate the fatigue of long-time operation. The correlated color temperature can be adjusted at any time, and the correlated color temperature of the head-up display device 120 can be changed accordingly.

With such a configuration, the driver can easily see the information, the visibility in front of the vehicle C is ensured, and the feeling of driving fatigue is reduced.

The preferred embodiments and modifications of the present invention have been described above, but the above-described embodiments are examples of the present invention, and these can be combined based on the knowledge of those skilled in the art. Included in the scope of the invention.

10, 110 Headlamps 20, 120 Head-up display device 22 Scanning mechanism 24 Control unit 30 Light source module 50 Windshield 100 Head-up display system 130 Light engine B1 White light B2 Irradiation light A High beam light distribution M Video light

Claims (8)

A head-up display device installed in a vehicle together with a headlamp.
A light source that can change the correlated color temperature of the emitted white light,
A control unit that adjusts the correlated color temperature of the white emitted light of the light source, and
A projection unit that forms the white emitted light of the light source as image light and projects it onto a projected member arranged in front of the driver's seat to superimpose it on the landscape and display a virtual image on the driver.
With
The control unit adjusts the correlated color temperature of the white emitted light of the light source according to the correlated color temperature of the irradiation light of the headlamp.
A head-up display device characterized by this. The control unit adjusts so that the correlated color temperature of the white emitted light of the light source differs from the correlated color temperature of the irradiation light of the headlamp by 1000 K or more.
The head-up display device according to claim 1. The control unit adjusts the correlated color temperature of the white emitted light of the light source to be 4000 K or less.
The head-up display device according to claim 1 or 2. The control unit adjusts so that the correlated color temperature of the white emitted light of the light source is always lower than the correlated color temperature of the irradiation light of the headlamp.
The head-up display device according to any one of claims 1 to 3. The control unit is configured to adjust the correlated color temperature of the white emitted light of the light source only when the headlamp is lit.
The head-up display device according to any one of claims 1 to 4. The head-up display device is configured to supply light emitted from a light engine configured as a common light source with the headlamp via a light guide.
The head-up display device according to any one of claims 1 to 5. The control unit adjusts the correlated color temperature of the white emitted light of the light source according to the correlated color temperature of the irradiation light of the headlamp and the object color of the object due to the irradiation light of the headlamp.
The head-up display device according to claim 1 to 6. A head-up display system installed in a vehicle
Headlamps that illuminate the front of the vehicle and
A light source capable of changing the correlated color temperature of the emitted white light, a control unit for adjusting the correlated color temperature of the white emitted light of the light source, and the white emitted light of the light source are formed as image light in front of the driver. A head-up display device having a projection unit that displays a virtual image by superimposing it on a landscape by projecting it onto an arranged member to be projected.
With
The control unit adjusts the correlated color temperature of the white emitted light of the light source according to the correlated color temperature of the irradiation light of the headlamp.
A head-up display system that features this.