WO2019087912A1

WO2019087912A1 - Head-up display device

Info

Publication number: WO2019087912A1
Application number: PCT/JP2018/039604
Authority: WO
Inventors: 裕輝春山; 千秋渋谷
Original assignee: 日本精機株式会社
Priority date: 2017-10-31
Filing date: 2018-10-25
Publication date: 2019-05-09
Also published as: JPWO2019087912A1; JP7287277B2

Abstract

The present invention provides a head-up display device capable of mitigating the yellow ring phenomenon. The head-up display device comprises: a white light source 19; a first lens 21 through which light Lw from the white light source 19 is transmitted; and antireflection films 28a, 28b that are provided on the first lens 21 as a dielectric multilayer film that increases the reflectance of a red wavelength component Lr and a green wavelength component Lg included in the light Lw relative to the reflectance of a blue wavelength component Lb included in the light Lw with an increase in the incident angle α of the light Lw incident on the first lens 21.

Description

Head-up display device

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

Conventionally, for example, as described in Patent Document 1, a white LED (Light Emitting Diode) light source that emits white light, a lens that substantially collimates light from the white LED light source, and light that has passed through the lens There is known a head-up display device including a liquid crystal display panel to be illuminated.

JP, 2016-218391, A

However, in the configuration of Patent Document 1, due to various causes to be described later, as shown in FIG. 12, the peripheral portion 90 of light emitted from the white LED light source 119 has a yellowish color compared to the central portion 91. A phenomenon occurs and illumination unevenness occurs.

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a head-up display device capable of alleviating the yellow ring phenomenon.

In order to achieve the above object, the head-up display device according to the present invention is formed in a white light source, a lens through which light from the white light source is transmitted, and the lens, and the incident angle of the light on the lens is large. And a dielectric multilayer film for increasing the reflectance of the red wavelength component and the green wavelength component contained in the light relative to the reflectance of the blue wavelength component contained in the light.

According to the present invention, the yellow ring phenomenon can be alleviated in the head-up display device.

1 is a schematic view of a vehicle equipped with a head-up display device according to an embodiment of the present invention. It is a typical sectional view of a head up display device concerning one embodiment of the present invention. It is a schematic diagram of the white light source which concerns on one Embodiment of this invention. It is a schematic diagram which shows the light emission surface of a white light source. It is a perspective view of the 1st lens concerning one embodiment of the present invention. They are a top view, a side view, and a front view of the 3rd lens concerning one embodiment of the present invention. It is a figure which shows the optical path of the light from a white light source when the anti-reflective film is formed in the 1st lens which concerns on one Embodiment of this invention. It is a figure which shows the optical path of the light from a white light source when the anti-reflective film is not formed in the lens. It is a graph which shows the relationship of the wavelength and reflectance in the anti-reflective film which concerns on one Embodiment of this invention. It is a graph which shows typically the relationship between the wavelength at the time of the incident angle which concerns on one Embodiment of this invention changing, and a reflectance. It is a graph which shows the relationship of the incident angle of the light in the anti-reflective film concerning one Embodiment of this invention, and the reflectance of each color component. It is a schematic diagram which shows the yellow ring phenomenon. It is a schematic diagram which shows the yellow ring phenomenon of each convex lens part of a 1st lens.

One embodiment of a head-up display device (hereinafter referred to as a HUD device) according to the present invention will be described with reference to the drawings. Hereinafter, the X direction coincides with the longitudinal direction of the vehicle, the Y direction coincides with the width direction of the vehicle, and the Z direction coincides with the height direction of the vehicle.

As shown in FIG. 1, the HUD device 10 is installed, for example, in a dashboard of the vehicle 200. The HUD device 10 emits display light L representing an image including vehicle information toward a windshield 201 which is an example of a projection member of the vehicle 200. The viewer 1 (for example, the driver of the vehicle 200) receives the display light L reflected by the windshield 201 and can visually recognize the virtual image V including the vehicle information through the windshield 201.

As shown in FIG. 2, the HUD device 10 includes a display device 11, a concave mirror 20, a housing 30, and a heat dissipation member 40.

The housing 30 is formed of a light impermeable resin or a light impermeable metal, and forms a hollow substantially rectangular parallelepiped. The housing 30 has an opening 30a at a position facing the windshield 201 in the Z direction. A curved plate-like window 31 made of a light transmitting resin such as acrylic through which the display light L passes is fitted in the opening 30a.

The heat radiating member 40 is fixed to the display device 11 so as to be exposed to the outside of the housing 30. The heat radiating member 40 is formed of, for example, a metal such as aluminum or a heat conductive resin. The heat dissipation member 40 dissipates the heat generated by the display device 11 to the outside.

The display device 11 includes an illumination device 11 a and a liquid crystal device 11 b that emits display light L by being illuminated by the illumination device 11 a.
The illumination device 11 a includes first to third lenses 21 to 23, a plurality of white light sources 19, a circuit board 16, a first case body 14, and an anti-reflection film (AR coating: Anti Reflection Coating) 28 a, And 28b.

The circuit board 16 is a printed board formed in a rectangular plate shape. One surface of the circuit board 16 is in surface contact with the heat dissipation member 40, and a plurality of white light sources 19 are mounted on the other surface of the circuit board 16.

Each white light source 19 is made of, for example, a surface-mounted white LED and emits substantially white light Lw. The white light sources 19 are arranged in a matrix on the circuit board 16. In the present example, the white light sources 19 are arranged in a matrix of 2 rows × 6 columns. In this example, the row direction is the Z direction, and the column direction is the Y direction.

As shown in FIG. 3, the white light source 19 includes a blue light source element 19a which is a blue LED element, a yellow phosphor 19b, and a package 19c. The package 19c is formed of a light impermeable metal or a light impermeable resin, and includes a receiving recess 19d. A white light source 19 is provided on the bottom of the housing recess 19d, and the yellow phosphor 19b is filled in the housing recess 19d. The blue light source element 19a emits blue light to the yellow phosphor 19b. The yellow phosphor 19b generates substantially white light Lw by changing the wavelength of blue light from the blue light source element 19a, and emits the light Lw to the outside.

As shown in FIG. 2, the first case body 14 is formed, for example, of a light impermeable resin in a rectangular cylindrical shape. The first case body 14 holds, in its inner space, a circuit board 16 on which a plurality of white light sources 19 are mounted and first to third lenses 21 to 23.

The first to third lenses 21 to 23 are disposed in the order of the first lens 21, the second lens 22 and the third lens 23 from the position close to the white light source 19. Light Lw from the white light source 19 passes through the first to third lenses 21 to 23.

Specifically, the first lens 21 is formed in a rectangular plate shape from a light transmitting resin or a light transmitting glass. The first lens 21 includes an incident surface 21i on which light is incident, and an exit surface 21o from which light transmitted through the first lens 21 in the thickness direction is emitted. The first lens 21 has a plurality of convex lens portions 21 a arranged in a matrix.

As shown in FIG. 5, the convex lens portions 21 a of the first lens 21 are formed in a biconvex lens shape, and are arranged in a 2 × 6 matrix as in the white light source 19 described above. Each convex lens portion 21 a is positioned to face each white light source 19 so as to receive the light Lw from each white light source 19. As shown in FIG. 13, each white light source 19 is positioned at the center of each convex lens portion 21 a when viewed from the X direction. Each convex lens portion 21 a has a function of condensing the light emitted from the white light source 19 and substantially collimating the light along the X direction.

As shown in FIG. 2,

anti-reflection films

28a and 28b for reducing the yellow ring phenomenon are formed on the incident surface 21i and the output surface 21o of the first lens 21 as described later. The configuration and action of the

antireflective films

28a and 28b will be described in detail later.

The second lens 22 is formed in a rectangular plate shape by a light transmitting resin or a light transmitting glass. Specifically, the second lens 22 includes an incident surface 22i on which light is incident, and an exit surface 22o from which light having passed through the second lens 22 in the thickness direction is emitted.

On the incident surface 22i of the second lens 22, a plurality (11 in this example) of cylindrical lens portions 22a are formed. A plurality of (11 in this example) cylindrical lens portions 22 b are formed on the exit surface 22 o of the second lens 22. The cylindrical lens portions 22 a and 22 b extend in a semi-cylindrical shape along the Y direction of the second lens 22 and are arranged along the Z direction of the second lens 22.
The incident surface 22i of the second lens 22 has a function of diffusing light in the Z direction by the cylindrical lens portion 22a. The diffusion angle of light can be adjusted based on the pitch and the radius of curvature of the cylindrical lens portions 22 a and 22 b of the second lens 22. Further, the exit surface 22o of the second lens 22 has a function of adjusting the diffusion angle of light which is not completely parallelized by the cylindrical lens portion 22b.

The third lens 23 is formed in a rectangular plate shape by a light transmitting resin or a light transmitting glass. Specifically, the third lens 23 includes an incident surface 23i on which light is incident, and an exit surface 23o from which light having passed through the inside of the third lens 23 in the thickness direction is emitted.

As shown in FIG. 6, on the incident surface 23i of the third lens 23, a plurality (16 in this example) of cylindrical lens portions 23a are formed. The cylindrical lens portions 23 a extend in a semi-cylindrical shape along the Z direction of the third lens 23 and are arranged along the Y direction of the third lens 23. The incident surface 23i of the third lens 23 has a function of diffusing light in the Y direction by the cylindrical lens portion 23a.

The exit surface 23 o of the third lens 23 is formed of a concave toroidal surface so as to diffuse light in accordance with the liquid crystal display panel 18 described later. That is, the exit surface 23 o of the third lens 23 is formed with a concave curved surface along the Z direction and the Y direction of the third lens 23. The exit surface 23 o of the third lens 23 has a function of diffusing light so as to illuminate the entire area of the liquid crystal display panel 18 described later.

As shown in FIG. 2, the liquid crystal device 11 b includes a liquid crystal display panel 18, a light diffusion member 17, and a second case body 15.
The second case body 15 is formed of a light impermeable resin, and holds the light diffusion member 17 and the liquid crystal display panel 18. The second case body 15 is formed in a rectangular frame shape surrounding the light diffusing member 17 and the liquid crystal display panel 18.

The light diffusion member 17 and the liquid crystal display panel 18 respectively extend along the YZ plane and face each other. The light diffusion member 17 is provided at a position close to the third lens 23, and the liquid crystal display panel 18 is provided at a position facing the concave mirror 20 in the X direction.

The liquid crystal display panel 18 is configured of, for example, a TFT (Thin Film Transistor) type liquid crystal display panel. The liquid crystal display panel 18 is switched to either the transmissive state or the non-transmissive state for each pixel under the control of a control unit (not shown). Thereby, the liquid crystal display panel 18 receives the light transmitted through the third lens 23 and emits the display light L according to the image.

The light diffusion member 17 includes a base made of a light transmitting resin (not shown) and a light diffusion portion formed on the base and embossed.

The concave mirror 20 magnifies the image represented by the display light L while reflecting the display light L from the display device 11, and irradiates the magnified image on the windshield 201. The concave mirror 20 includes a holder (not shown) made of resin such as polycarbonate, and a reflection layer formed on the holder made of metal such as aluminum.

The following three causes (a) to (c) can be mainly considered as the causes of occurrence of the yellow ring phenomenon described in the above background art. In the present embodiment, the

anti-reflection films

28 a and 28 b are formed on the first lens 21 to alleviate the yellow ring phenomenon.

(A) Color Unevenness According to the Travel Distance of Yellow Phosphor 19b of Light As shown in FIG. 3, light from blue light source 19a passes through yellow phosphor 19b as the emission angle of blue light source 19a increases. As the distance D becomes longer and the distance D becomes longer, the color of the light Lw emitted from the yellow phosphor 19 b becomes closer to yellow. As a result, as shown in FIG. 12, a yellow ring phenomenon occurs in which the peripheral portion 90 of the light emitted from each white light source 19 has a yellowish color than the central portion 91.

(B) Color unevenness of light emitting surface of white light source 19 As shown in FIG. 3, light B1 emitted from the blue light source element 19a is emitted from the yellow phosphor 19b without being reflected in the yellow phosphor 19b. This light B1 is white light. On the other hand, light B2 emitted from the blue light source element 19a is emitted from the yellow phosphor 19b after being reflected by the emission surface of the yellow phosphor 19b, the side surface and the bottom surface of the accommodation recess 19d in the yellow phosphor 19b. The light B2 becomes yellow light because the light path from the yellow phosphor 19b to the light B1 is longer than the light B1.
As shown in FIG. 4, the light emitting surface 19s of the white light source 19 is formed on the outer periphery of the white region 19w from which the light B1 which is white light is emitted and the white region 19w, and the light B2 which is yellow light is emitted. It divides into yellow area 19y. As a result, as shown in FIG. 12, a yellow ring phenomenon occurs in which the peripheral portion 90 of the light emitted from each white light source 19 has a yellowish color than the central portion 91.

(C) Dispersion of light by lens The light passing through the inside of the lens has a different refractive index depending on the wavelength of the light, so the optical path differs for each wavelength of light. This property of light is called light dispersion. Thereby, as shown in FIG. 8, when light Lw from the white light source 19 is incident on the convex lens portion 121a where the

anti-reflection films

28a and 28b are not formed unlike the present embodiment, the red wavelength component Lr and green of the light Lw The wavelength component Lg is directed to the peripheral portion of the convex lens portion 121a compared to the blue wavelength component Lb. For this reason, a yellow ring phenomenon occurs in which the peripheral edge portion of the convex lens portion 121a is yellow formed by the red wavelength component Lr and the green wavelength component Lg.
This is the end of the description of the cause of the yellow ring phenomenon.

Next, the configuration and operation of the

antireflective films

28a and 28b will be described with reference to FIG.
An antireflection film 28 a is formed on the incident surface 21 i of the first lens 21, and an antireflection film 28 b is formed on the emission surface 21 o of the first lens 21.
As shown in FIGS. 7 and 11, the

anti-reflection films

28 a and 28 b indicate that the red light Lw from the white light source 19 becomes red as the incident angle α of the light Lw to the incident surface 21 i of the first lens 21 increases. The derivative multilayer film has a property that the reflectances of the wavelength component Lr and the green wavelength component Lg increase relative to the reflectance of the blue wavelength component Lb in the light Lw. As an example, the red wavelength component Lr has a wavelength of 610 nm, the green wavelength component Lg has a wavelength of 560 nm, and the blue wavelength component Lb has a wavelength of 470 nm.

As shown in FIG. 7, the incident angle α of the light Lw is an angle formed by the incident light ray direction of the light Lw and the normal direction of the incident surface 21 i of the first lens 21. Therefore, as the incident angle α of the light Lw is larger, the center of the convex lens portion 21a is closer to the peripheral portion. Therefore, due to the properties of the

antireflective films

28a and 28b described above, the red wavelength component Lr and the green wavelength component are formed by the

antireflective films

28a and 28b at positions where the incident angle .alpha. Lg is likely to be reflected at the convex lens portion 21 a and to be hard to transmit. As a result, the yellow light intensity generated by the red wavelength component Lr and the green wavelength component Lg in the peripheral portion of the convex lens portion 21a is reduced, and the yellow ring phenomenon can be alleviated.

In order to realize the above-described properties of the

antireflective films

28a and 28b, the phenomenon of so-called blue shift which occurs in the derivative multilayer film is utilized. This blue shift, as schematically shown in FIG. 10, means that the wavelength P at which the reflectance becomes minimum shifts to the short wavelength side, that is, to the blue side as the incident angle α of the light Lw increases. In the example of FIG. 10, in the case of the first incident angle α1, the reflectance with respect to the wavelength is indicated by the curve C1 indicated by the solid line in FIG. 10, and in the case of the second incident angle α2 larger than the first incident angle α1 The reflectance with respect to wavelength is indicated by a curve C2 indicated by a broken line in FIG. Thereby, the reflectance of the blue wavelength component Lb is smaller than the reflectance of the red wavelength component Lr and the reflectance of the green wavelength component Lg at a position where the incident angle α of the light Lw is increased, that is, at the peripheral portion of the convex lens portion 21a. The reflectance of the red wavelength component Lr and the green wavelength component Lg can be made larger than the reflectance of the blue wavelength component Lb. For this reason, as described above, the yellow ring phenomenon can be alleviated.

As an example, as shown in FIG. 9, in the

antireflection films

28a and 28b, the reflectance per surface when the incident angle α is 5 ° or less is 1% or less in the wavelength range of 450 to 640 nm and the wavelength range of 400 to 700 nm Preferably, the dielectric multilayer film has a spectral characteristic of 2% or less. Further, as shown in FIG. 9, when the ratio of reflectance per surface at an incident angle α of 5 ° or less is 1, the range of wavelengths of 400 to 700 nm is assumed to be 1. A dielectric multilayer film having a spectral characteristic in which the range of 2 is 2 is preferable. Thereby, the yellow ring phenomenon can be alleviated. Note that this spectral characteristic is an example, and the

antireflection films

28a and 28b may have spectral characteristics different from this spectral characteristic as long as the yellow ring phenomenon can be alleviated.

(effect)
According to the embodiment described above, the following effects can be obtained.

(1) The HUD device 10 includes the white light source 19, the first lens 21 through which the light Lw from the white light source 19 passes, and the first lens 21, and the light Lw is incident on the first lens 21. Antireflection that is a dielectric multilayer film that increases the reflectance of the red wavelength component Lr and the green wavelength component Lg contained in the light Lw with respect to the reflectance of the blue wavelength component Lb contained in the light Lw as the angle α becomes larger And a

membrane

28a, 28b.
According to this configuration, the reflectances of the red wavelength component Lr and the green wavelength component Lg forming the yellow light of the peripheral portion 90 in the yellow ring phenomenon shown in FIG. 12 by the

antireflective films

28a and 28b reflect the blue wavelength component Lb It is increased relative to the rate. Thereby, the light intensities of the red wavelength component Lr and the green wavelength component Lg are weakened, and the color of the peripheral portion 90 can be made close to the color of the central portion 91. Thus, the yellow ring phenomenon can be alleviated.
Further, since only the

anti-reflection films

28a and 28b are formed on the first lens 21, there is no need to add an optical element such as a lens to alleviate the yellow ring phenomenon, and the yellow ring can be formed by a simple configuration. The phenomenon can be mitigated.

(2) The HUD device 10 includes the first to third lenses 21 to 23 including the first lens 21, and the first lens 21 on which the

anti-reflection films

28a and 28b are formed is the first to third lenses. The lens 21 to 23 are provided at the position closest to the white light source 19.
According to this configuration, it is possible to further alleviate the yellow ring phenomenon.

(3) The white light source 19 includes a blue light source element 19a that emits blue light, and a yellow phosphor 19b that generates white light by transmitting blue light from the blue light source element 19a.
When this type of white light source 19 is adopted, the yellow ring phenomenon tends to be remarkable due to (a) and (b) of the causes of the occurrence of the above-mentioned yellow ring phenomenon. Therefore, in this situation, it is particularly useful to reduce the yellow ring phenomenon by the

antireflective films

28a and 28b.

(4) The first lens 21 includes a plurality of convex lens portions 21a disposed adjacent to each other, and the plurality of white light sources 19 are positioned to face the plurality of convex lens portions 21a.
If the

anti-reflection films

28a and 28b are not formed on the first lens 21, the peripheral portion 21o of the light emitted from each of the convex lens portions 21a is the central portion 21c of the light as shown in FIG. More yellowish. When the white light sources 19 are arranged in a matrix corresponding to the convex lens portions 21a, peripheral edge portions 21o having a yellowish color are formed by the number of the convex lens portions 21a, and at least a part of the peripheral edge portions 21o adjacent to one another overlap one another. It is also assumed that yellowishness may be increased by doing so. As described above, in the HUD device 10 having the configuration in which the yellow ring phenomenon is easily noticeable, it is particularly useful to reduce the yellow ring phenomenon by the

anti-reflection films

28 a and 28 b.

(5) The HUD device 10 projects the display light L and the liquid crystal display panel 18 that emits the display light L by being illuminated by the light Lw from the white light source 19 that has passed through the first to third lenses 21 to 23. And a concave mirror 20 that reflects toward a windshield 201, which is an example of a member.
The concave mirror 20 enlarges the light including the yellowish peripheral edge 21 o according to the yellow ring phenomenon and displays the light as a virtual image V. As described above, since the HUD device 10 is configured to easily reduce the visibility of the virtual image V due to the yellow ring phenomenon, it is particularly useful to reduce the yellow ring phenomenon by the

antireflective films

28 a and 28 b.

(6) The

anti-reflection films

28a and 28b are formed on the entrance surface 21i and the exit surface 21o of the first lens 21, respectively.
According to this configuration, the red wavelength component Lr and the green wavelength component Lg are higher in reflectance than the blue wavelength component Lb at two locations, the antireflective film 28a on the incident surface 21i and the antireflective film 28b on the output surface 21o. It is reflected. For this reason, compared with the case where the anti-reflection film is formed on any one of the light incident surface 21i and the light emission surface 21o of the first lens 21, the yellow ring phenomenon can be further alleviated.

(Modification)
In addition, said each embodiment can be implemented in the following forms which changed this suitably.

In the above-mentioned embodiment, although

antireflection films

28a and 28b were formed in the 1st lens 21, the lens in which an antireflection film is formed is not restricted to the 1st lens 21, but the 2nd lens 22 or the 1st A third lens 23 may be used. In addition, an anti-reflection film may be formed on any two of the first to third lenses 21 to 23 or an anti-reflection film is formed on all of the first to third lenses 21 to 23. It is also good.

Although the

anti-reflection films

28a and 28b are formed on the entrance surface 21i and the exit surface 21o of the first lens 21 in the above embodiment, even if one of the two

anti-reflection films

28a and 28b is omitted. Good. When an antireflective film is formed on lenses other than the first lens 21, the antireflective film may be formed on either the incident surface or the exit surface, or the antireflective film may be formed on both the incident surface and the exit surface. You may form. When forming an anti-reflective film in any of an entrance plane and an output surface, forming in an output surface is preferable.

In the above embodiment, the white light source 19 is a surface mounted white LED. However, the present invention is not limited to this. The white light source 19 may be another type of LED such as a shell type or chip on board type. Furthermore, although the white light source 19 is an LED, it may be another light source such as an incandescent lamp. Even when the white light source 19 is of a type other than a surface mount type white LED, a yellow ring is generated due to the cause (c) of the generation of the yellow ring phenomenon described above.

In the above embodiment, the HUD device 10 and the illumination device 11a include the first to third lenses 21 to 23. However, the second lens 22 and the third lens 23 may be omitted. In addition, the light diffusion member 17 may be omitted.

The shapes of the first to third lenses 21 to 23 in the above embodiment can be changed as appropriate. For example, the cylindrical lens portion 22b formed on the exit surface 22o of the second lens 22 may be omitted, and the exit surface 22o may be formed in a planar shape. The exit surface of the third lens 23 may have a convex lens shape, a free curved surface shape, a simple spherical surface shape, a cylindrical surface shape, or an aspheric surface shape. The convex lens portion 21 a of the first lens 21 is formed in a biconvex lens shape, but may be formed in a plano-convex lens shape or a Fresnel lens shape.

The concave mirror 20 in the above embodiment may be omitted. In this case, the display light L from the display device 11 may be directly irradiated to the projection member (for example, the windshield 201).
The HUD device 10 may further include a relay member formed of a plane mirror or the like that reflects the display light L from the display device 11 toward the concave mirror 20.

Although the HUD device 10 is mounted on the vehicle 200 in the above embodiment, the HUD device 10 may be mounted on a vehicle other than a vehicle, such as an airplane or a ship. In addition, although the HUD device 10 irradiates the display light L to the windshield 201, the display light L may be irradiated to a dedicated combiner as a projection member.

The liquid crystal display panel 18 in the above embodiment is not limited to the TFT type, and may be a segment type.

REFERENCE SIGNS LIST 1 viewer 10 head-up display device, HUD device 11 display device 11 a lighting device 11 b liquid crystal device 14 first case body 15 second case body 16 circuit board 17 light diffusion member 18 liquid crystal display panel 19 white light source 19 a blue light source element 19b yellow phosphor 19c package 19d accommodation recess 20 concave mirror 21

first lens

21a, 121a

convex lens portion

21i, 22i, 23i entrance surface 21o, 22o, 23o exit surface 22 second lens 23

third lens

28a, 28b reflection prevention Film α Incident angle Lb Blue wavelength component Lg Green wavelength component Lr Red wavelength component

Claims

White light source,
A lens through which light from the white light source passes;
The reflectance of the red wavelength component and the green wavelength component contained in the light is formed with respect to the reflectance of the blue wavelength component contained in the light as the incident angle of the light to the lens increases. And increasing dielectric multilayer films,
Head-up display device.
Comprising a plurality of lenses including the lens,
The lens on which the dielectric multilayer film is formed is provided at a position closest to the white light source among the plurality of lenses.
The head-up display device according to claim 1.
The white light source is
A blue light source element that emits blue light;
A yellow phosphor that generates white light as the light by transmitting the blue light from the blue light source element;
The head-up display device according to claim 1.
The lens comprises a plurality of convex lens portions arranged adjacent to each other,
The plurality of white light sources are positioned to face the plurality of convex lens portions, respectively.
The head-up display device according to any one of claims 1 to 3.
A liquid crystal display panel that emits display light by being illuminated by light emitted from the lens;
And a concave mirror for reflecting the display light toward the projection member.
The head-up display device according to any one of claims 1 to 4.