Display device for vehicle

Abstract

A vehicle display device is provided with: a display (10); a reflection member (40) that reflects the display light emitted from the display on the housing (61) and projects the display light onto a projection target portion (Rwf); and a control unit (50) that controls display light in accordance with an eye point (EP) or an eye movement range (EB), the display being provided with: a backlight unit (20) that diffuses and distributes light from a light source (21) from an irradiation surface (20a); and a light-transmitting plate-shaped display unit (30) that transmits the irradiation light incident on the irradiated surface (30a) from the irradiation surface and emits the light as display light from the emission surface (30b), the display unit being inclined relative to the irradiation surface between the irradiation surface and the reflection member. The control unit controls the irradiation surface such that the interval between second end portions forming the upper end of the virtual image in the irradiation surface and the irradiated surface is larger than the interval between first end portions forming the lower end of the virtual image, and the control unit causes the illuminance of the irradiation light incident on the irradiated surface from the irradiation surface to be higher at the second end portions than at the first end portions. The brightness unevenness of the display light emitted from the emitting surface of the display unit is reduced.

Description

Technical Field

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

[0002] In the past, a vehicle was equipped with a vehicle display device that displays information provided to passengers in the vehicle cabin as a virtual image. The vehicle display device is a so-called head-up display device, which includes: a display that emits display information projected onto a projection portion as display light; and a reflective component that reflects the display light emitted from the display and projects the display light onto the projection portion. The vehicle display device allows passengers to visually recognize the display information corresponding to the display light projected onto the projection portion as a virtual image. For example, such a vehicle display device is disclosed in the following patent document 1. In the vehicle display device of patent document 1, external light is reflected by the reflective component toward the emission surface of a light-transmitting display unit, and the emission surface is tilted so that the external light does not return to the reflective component from the emission surface of the display unit, thereby avoiding the reflection of external light.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-101056 Summary of the invention

[0006] Technical problem that the invention aims to solve

[0007] However, the light-transmitting display unit transmits the light from the backlight source irradiated from the back and emits it from the emission surface toward the reflective component as display light. In the previous vehicle display device, the display unit is tilted relative to the optical axis of the backlight source toward the reflective component. In this display unit, the brightness of the part away from the backlight source is reduced, thus causing uneven brightness.

[0008] Therefore, an object of the present invention is to provide a vehicle display device with reduced brightness unevenness.

[0009] Technical solutions to the problem

[0010] The vehicle display device of the present invention is characterized in that it comprises: a frame; a display, wherein the display information that is visually recognized as a virtual image by an occupant in the vehicle cabin is emitted as display light in the frame; at least one reflecting component, at least one of the reflecting components reflects the display light emitted from the display in the frame and projects the display light from an opening of the frame onto a projected portion in the vehicle cabin; and a control unit, wherein the control unit controls the display light according to the eye point or eye movement range of the occupant, wherein the eye movement range is a range within which the eye point of the virtual image can be visually recognized, wherein the display comprises: a backlight unit, wherein the backlight unit diffuses and distributes light from a light source from an irradiation surface; and a light-transmitting plate-shaped display unit, wherein the backlight unit diffuses and distributes light from a light source from an irradiation surface. The irradiation light incident on the irradiated surface is transmitted through the irradiation surface and emitted from the emission surface as the display light. The display unit is tilted relative to the irradiation surface between the irradiation surface and the reflective component arranged in the optical axis direction of the backlight unit relative to the irradiation surface, so that the interval between the first end portions of the irradiation surface and the lower end of the irradiated surface in the vertical direction forming the virtual image is larger than the interval between the second end portions of the irradiation surface and the upper end of the irradiated surface in the vertical direction forming the virtual image. The control unit controls the backlight unit so that the illumination of the irradiation light incident on the irradiated surface from the irradiation surface is higher at the first end portion than at the second end portion, thereby reducing the uneven brightness of the display light emitted from the emission surface of the display unit.

[0011] Effects of the Invention

[0012] The luminance of the first end of the emitting surface of the display unit of the vehicle display device according to the present invention is higher than that of the second end of the emitting surface, thereby reducing the luminance unevenness of the display light emitted from the emitting surface over the entire emitting surface, thereby improving the visibility of the virtual image display. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram showing a vehicle display device according to an embodiment.

[0014] Figure 2 It is a schematic diagram showing a display according to the embodiment.

[0015] Figure 3 This is an explanatory diagram showing an example of the arrangement of light sources.

[0016] Figure 4 This is an explanatory diagram for explaining the relationship between the emission angle and the light transmittance in the display unit.

[0017] Figure 5 This is an explanatory diagram for explaining uneven brightness of a display unit.

[0018] Figure 6This is an explanatory diagram showing an example of mapping data of the brightness correction value with respect to the illuminance of external light.

[0019] Figure 7 1 is a schematic diagram showing a vehicle display device according to a modified example.

[0020] Figure 8 It is a schematic diagram showing a display according to a modified example. DETAILED DESCRIPTION

[0021] Hereinafter, an embodiment of the vehicle display device according to the present invention will be described in detail based on the drawings. However, the present invention is not limited to the embodiment.

[0022] [Example]

[0023] based on Figures 1 to 6 An embodiment of a vehicle display device according to the present invention will be described.

[0024] Figure 1 Reference numeral 1 denotes a vehicle display device of the embodiment. The vehicle display device 1 is a so-called head-up display device that displays information provided to passengers in a vehicle (such as an automobile) as a virtual image.

[0025] The vehicle display device 1 includes a display 10 that emits display information that is visually recognized as a virtual image by a passenger in the vehicle compartment as display light in a housing 61 described below ( Figure 1 The display 10 includes a backlight unit 20 and a light-transmitting plate-shaped display unit 30, which transmits light irradiated from the backlight unit 20 to the display unit 30, and emits display light as display information from the display unit 30 ( Figure 1 ).

[0026] Furthermore, the vehicle display device 1 includes at least one reflecting member, which reflects the display light emitted from the display 10 in the frame 61 and projects the display light from the opening 61a of the frame 61 to the projection portion Rwf in the vehicle interior. Figure 1 ). The reflecting member 40 is, for example, a magnifying glass that amplifies and reflects the display light emitted from the display 10. As the reflecting member 40, for example, an aspherical (free-form surface) reflecting mirror is used. The display light projected on the projection portion Rwf is reflected from the projection portion Rwf toward the eye point EP or the eye movement range EB, and is visually recognized as a virtual image by the passenger ( Figure 1 The eye point EP indicates the position of the eye of the passenger in the vehicle. The eye movement range EB indicates the range of the eye point EP within which the virtual image can be visually confirmed.

[0027] The vehicle display device 1 includes a control unit 50 that controls display light according to the eye point EP or eye movement range EB of the occupant. Figure 1 ).

[0028] The vehicle display device 1 further includes: a frame 61 that accommodates at least the display 10 and the reflective member 40 inside; and a transparent cover 62 that closes an opening 61a ( Figure 1 In the vehicle display device 1, the display light reflected by the reflective member 40 is emitted from the cover 62 to the outside of the frame 61, and is projected onto the projection portion Rwf existing in front of the path. The vehicle display device 1 shown here is housed in the instrument panel Pi in the vehicle interior with the cover 62 exposed, and the display light reflected by the reflective member 40 is projected onto the projection portion Rwf ( Figure 1 ) Moreover, the vehicle display device 1 reflects the display light at the projection portion Rwf toward the eye point EP or the eye movement range EB.

[0029] Here, the projected portion Rwf refers to the windshield (here, the front windshield Wf) itself or a part thereof. In addition, the projected portion Rwf can also be formed as a half-reflecting mirror, which receives the display light from the reflective component 40 on the reflecting surface and reflects it to the eye point EP or the eye movement range EB, and emits the light from the outside of the vehicle to the passenger side. For example, the projected portion Rwf as the half-reflecting mirror is formed as a semi-transparent film along the curved surface shape of the windshield (front windshield Wf), and is attached to the wall surface of the inner side of the vehicle interior of the windshield by an adhesive. In addition, the projected portion Rwf as the half-reflecting mirror can also be formed as a semi-transparent film along the curved surface shape of the windshield (front windshield Wf), and is sealed in the windshield of the laminated glass together with the intermediate film. In addition, the projected portion Rwf as the half-reflecting mirror can also be a semi-transparent coating applied to the wall surface of the inner side of the vehicle interior of the windshield (front windshield Wf) by coating or the like. In addition, the projection target portion Rwf may be a combiner that covers the front windshield Wf from the inner side of the vehicle interior.

[0030] The backlight unit 20 includes a light source 21, a control substrate 22 for the light source 21, and a heat sink 23 ( Figure 2). The light source 21 is a light emitting element. Here, a light emitting diode element is used as the light emitting element. A plurality of light sources 21 are arranged between a first light source position associated with irradiation light from a first end portion (upper end in the vertical direction) of an irradiation surface 20a described later and a second light source position associated with irradiation light from a second end portion (lower end in the vertical direction) of the irradiation surface 20a. The backlight unit 20 shown here includes a plurality of light sources 21 arranged in the vertical direction. The control substrate 22 electrically connects the light sources 21 to a power source via a wiring pattern. The substrate surface 22a of the control substrate 22 shown here is configured with a plurality of light sources 21 ( Figure 2 and Figure 3 ).

[0031] Furthermore, the backlight unit 20 includes: a condenser lens 24, which is arranged opposite to the substrate surface 22a of the control substrate 22, and condenses the light from the light source 21 (hereinafter referred to as "light source light") between the condenser lens 24 and the substrate surface 22a; and a field lens 25, which diffuses and distributes the light source light condensed by the condenser lens 24 ( Figure 2 ).

[0032] The condenser lens 24 is a lens component made of glass or transparent resin that condenses the light from the light source 21. The condenser lens 24 shown here uses, for example, a condenser lens in which a lens element 24a provided for each light source 21 is arranged opposite to the light source 21. The lens element 24a has an incident surface on which the light from the light source 21 is incident, and an exit surface from which the light from the light source incident from the incident surface is exited, and is formed as a plano-convex lens in which the incident surface is a flat surface and the exit surface is a convex curved surface.

[0033] The field lens 25 is a lens component made of glass or transparent resin that aligns the traveling direction of the light source light emitted from the condenser lens 24, and is interposed between the condenser lens 24 and the display unit 30. The field lens 25 has an incident surface for incident light source light from each light source 21 via the condenser lens 24, and an exit surface for exiting the light source light incident from the incident surface. The field lens 25 shown here uses, for example, a Fresnel lens.

[0034] In the backlight unit 20, the emission surface of the field lens 25 becomes the irradiation surface 20a ( Figure 2 ), the field lens 25 is used to make the traveling directions of the light source lights of each light source 21 passing through the condenser lens 24 consistent, so that the light source lights are diffusely distributed from the irradiation surface 20a. In the backlight unit 20, for example, the direction orthogonal to the substrate surface 22a of the control substrate 22 and the direction orthogonal to the incident surface of the lens element 24a of the condenser lens 24 become the optical axis direction. The backlight unit 20 irradiates the light source lights emitted from the irradiation surface 20a to the display unit 30 as irradiation light.

[0035] The display unit 30 allows the irradiation light from the irradiation surface 20a of the backlight unit 20 to be incident on the irradiated surface 30a on the back side, and allows the display light for displaying information to be emitted from the emission surface 30b on the front side toward the reflective member 40 ( Figure 2 ). The display unit 30 transmits the irradiation light from the irradiation surface 20a incident on the irradiated surface 30a, and emits it from the emission surface 30b as display light. The display unit 30 shown here uses a light-transmitting TFT liquid crystal (Thin Film Transistor Liquid Crystal Display). The display unit 30 is controlled by the control unit 50 to display display information. For example, image information such as text, numbers, and graphics is displayed as the display information.

[0036] The display unit 30 is tilted relative to the irradiation surface 20a between the irradiation surface 20a and a reflective component 40 disposed in the direction of the optical axis of the backlight unit 20 relative to the irradiation surface 20a, so that the interval between the first end portions of the irradiation surface 20a and the irradiated surface 30a in the vertical direction at the lower end where the virtual image is formed is larger than the interval between the second end portions of the irradiation surface 20a and the irradiated surface 30a in the vertical direction at the upper end where the virtual image is formed. The irradiation surface 20a and the irradiated surface 30a of the present embodiment are respectively arranged with the vertically upper side as the first end portion and the vertically lower side as the second end portion. Therefore, the display unit 30 is tilted relative to the irradiation surface 20a, so that between the irradiation surface 20a and the reflective component 40, the interval between the vertically upper ends of the irradiation surface 20a and the irradiated surface 30a is larger than the interval between the vertically lower ends of the irradiation surface 20a and the irradiated surface 30a ( Figure 2 ). The display unit 30 and the irradiation surface 20a of the backlight unit 20 shown here are respectively rotated with the lower end at the vertical bottom as the center of rotation, and the upper end at the vertical top is tilted toward the front of the vehicle. In the vehicle display device 1, the tilting angle of the display unit 30 is larger than the tilting angle of the irradiation surface 20a of the backlight unit 20, so that the optical axis of the backlight unit 20 intersects the irradiated surface 30a and the emitting surface 30b of the display unit 30 non-orthogonally.

[0037] Specifically, in order to prevent the reflection of external light, the display unit 30 shown here is tilted relative to the irradiation surface 20a of the backlight unit 20, so that when the external light incident from the opening 61a of the frame 61 is reflected by the reflection member 40 and reaches the emission surface 30b, the external light reflected by the emission surface 30b is not directed toward the reflection member 40. For example, here, the external light reflected by the emission surface 30b is directed toward the bottom wall ( Figure 1 ).

[0038] Thus, in the vehicle display device 1, the optical axis direction of the backlight unit 20 intersects with the orthogonal direction perpendicular to the illuminated surface 30a and the emission surface 30b in the display unit 30. Therefore, in the display unit 30, the emission angle θ ( Figure 2 ) is larger at the upper end than at the lower end (θ2>θ1). For example, in the display unit 30 shown here, the display light is emitted from the lower end of the emission surface 30b at a negative emission angle θ relative to the reference emission direction, and the absolute value of the negative emission angle θ of the display light relative to the reference emission direction gradually decreases from the lower end toward the upper end side, and the display light is emitted toward the reference emission direction at a certain position (θ=0). Moreover, in the display unit 30 shown here, the positive emission angle θ of the display light relative to the reference emission direction increases from its positive-negative switching position (θ=0) toward the upper end side, and the absolute value of the positive emission angle θ becomes the same as the absolute value of the negative emission angle θ at the lower end at a certain position, and the positive emission angle θ of the display light relative to the reference emission direction becomes larger from this position toward the upper end side.

[0039] Here, when the emission angle θ of the display light relative to the reference emission direction is 0 degrees, the transmittance T(θ) of the display unit 30 is the highest, and the transmittance T(θ) decreases as the emission angle θ of the display light relative to the reference emission direction increases ( Figure 4 ), regardless of whether the emission angle θ is positive or negative. That is, the display unit 30 has the highest brightness L(θ) when the emission angle θ of the display light relative to the reference emission direction is 0 degrees, and the larger the emission angle θ of the display light relative to the reference emission direction, the lower the brightness L(θ), regardless of whether the emission angle θ is positive or negative. Therefore, in the display unit 30, if the illumination of the irradiation light from the irradiation surface 20a of the backlight unit 20 incident on the irradiated surface 30a is uniform over the entire surface of the irradiated surface 30a, then at the upper end where the interval between the irradiated surface 30a and the irradiation surface 20a is larger than the lower end, the brightness L(θ) is lower than the lower end, thereby causing brightness unevenness ( Figure 5 ). For example, in the display unit 30, when a first region where the absolute value of the emission angle θ of the display light relative to the reference emission direction is suppressed to a value below a certain value and a second region where the absolute value of the emission angle θ exceeds a certain value and becomes larger are mixed on the emission surface 30b, brightness unevenness to the extent that causes a sense of incongruity in the virtual image display occurs between the first region and the second region. Here, the first region is formed from the lower end to the front of the upper end of the emission surface 30b, and at the upper end of the emission surface 30b, which is the second region, the brightness L(θ) is significantly lower than that of the first region.

[0040] Therefore, the control unit 50 reduces the uneven brightness of the display unit 30 by controlling the backlight unit 20. The control unit 50 controls the backlight unit 20 so that the illuminance of the irradiated light from the irradiated surface 20a of the backlight unit 20 incident on the irradiated surface 30a of the display unit 30 is higher at the first end than at the second end (i.e., higher at the upper end in the vertical direction than at the lower end in the vertical direction), thereby reducing the uneven brightness of the display light emitted from the emitting surface 30b of the display unit 30. That is, the control unit 50 makes the illuminance of the irradiated light from the irradiation surface 20a of the backlight unit 20 that is irradiated to the irradiated surface 30a of the display unit 30 higher at the first end than at the second end of the irradiated surface 30a (that is, higher at the upper end in the vertical direction than at the lower end in the vertical direction), and the brightness L(θ) at the first end of the emission surface 30b of the display unit 30 is higher than the brightness at the second end (that is, the brightness at the upper end in the vertical direction is higher than the brightness at the lower end in the vertical direction), thereby reducing the overall brightness unevenness of the display light emitted from the emission surface 30b on the emission surface 30b.

[0041] Specifically, the control unit 50 makes the brightness of the light source 21 arranged at the first light source position (i.e., the upper end vertically above) in the arrangement direction of the light sources 21 in the backlight unit 20 higher than the brightness of the light source 21 arranged at the second light source position side (i.e., the lower end vertically), and makes the illuminance of the irradiation light from the irradiation surface 20a of the backlight unit 20 incident on the irradiated surface 30a of the display unit 30 higher at the first end than at the second end (i.e., at the upper end in the vertical direction than at the lower end in the vertical direction). For example, the control unit 50 calculates the brightness L(θ) of the position of the control object (here, the upper end of the irradiation surface 30b) according to the following formula 1 based on the brightness L(θmin) and the transmittance T(θmin) at the position where the absolute value of the irradiation angle θ of the display light relative to the reference irradiation direction is the smallest. Then, the control unit 50 controls the brightness of the light source 21 corresponding to the position of the control target (here, the upper end of the emission surface 30 b ) so as to approach the brightness L(θ) based on the calculated value of the brightness L(θ).

[0042] L(θ)={T(θmin) / T(θ)}*L(θmin)···(1)

[0043] In this way, the vehicle display device 1 of the present embodiment makes the brightness L(θ) of the first end of the emission surface 30b of the display unit 30 higher than the brightness of the second end (that is, the brightness of the upper end in the vertical direction is higher than the brightness of the lower end in the vertical direction), thereby reducing the overall brightness unevenness of the display light emitted from the emission surface 30b on the emission surface 30b, thereby improving the visibility of the virtual image display.

[0044] However, strictly speaking, in the display unit 30, the absolute value of the emission angle θ of the display light relative to the reference emission direction is different at each position of the emission surface 30b, so the brightness L(θ) at each position varies. Therefore, in the display unit 30, even in places where the visibility of the virtual image display is less affected, strictly speaking, brightness unevenness occurs.

[0045] Therefore, first, it is set to divide the emission surface 30b of the display unit 30 into a plurality of divided areas. For example, in the emission surface 30b, it is divided into divided areas for each light source 21, that is, a plurality of divided areas arranged at equal intervals in the vertical direction and the direction orthogonal to the vertical direction. Then, the control unit 50 calculates the brightness L(θ) of each divided area except the divided area in which the absolute value of the emission angle θ of the display light relative to the reference emission direction is the smallest based on the above formula 1. Moreover, the control unit 50 controls the brightness of the light source 21 corresponding to the divided area of ​​the control object in a manner close to the brightness L(θ) based on the calculated value of the brightness L(θ) of each divided area. As a result, the vehicle display device 1 can further reduce the uneven brightness of the display light emitted from the emission surface 30b of the display unit 30 on the entire emission surface 30b, thereby further improving the visibility of the virtual image display.

[0046] In addition, the control unit 50 may also adjust the illuminance of the irradiated light from the irradiation surface 20a of the backlight unit 20 incident on the irradiated surface 30a of the display unit 30 for each divided area according to the illuminance of the external light in each divided area, thereby reducing the uneven brightness of the display light emitted from the emission surface 30b of the display unit 30. In this case, the vehicle display device 1 is provided with an illuminance meter for each divided area to measure the illuminance of the external light reflected from the reflection component 40. Alternatively, the vehicle display device 1 measures the illuminance of the external light incident from the opening 61a of the frame 61 using the illuminance meter, and causes the control unit 50 to estimate the illuminance of the external light in each divided area based on the measurement result. For example, the control unit 50 is provided with mapping data ( Figure 6 ), and calculate the brightness correction value L(S) corresponding to the illuminance of the external light for each divided area based on the mapping data. For example, the brightness correction value L(S) is used as a correction coefficient, and the brightness L(θ) of the divided area of ​​the control object is calculated according to the following formula 2.

[0047] L(θ)={T(θmin) / T(θ)}*L(θmin)*L(S)···(2)

[0048] The control unit 50 controls the brightness of the light source 21 corresponding to the divided area of ​​the control object in a manner close to the brightness L(θ) based on the calculated value of the brightness L(θ). As a result, the vehicle display device 1 can eliminate the influence of external light and further reduce the uneven brightness of the display light emitted from the emission surface 30b of the display unit 30 on the entire emission surface 30b, thereby further improving the visibility of the virtual image display.

[0049] [Modifications]

[0050] The vehicle display device 2 of this modified example is different from the vehicle display device 1 of the above-mentioned embodiment in that the mounting angle of the display 10 is changed and another reflecting member ( Figure 7 ).

[0051] The vehicle display device 2 includes a first reflecting member 141 and a second reflecting member 142 as reflecting members. Figure 7 ), the first reflecting member 141 reflects the display light emitted from the display 10, and the second reflecting member 142 reflects the display light reflected by the first reflecting member 141 and projects it to the projection part Rwf through the opening 61a of the frame body 61. The first reflecting member 141 is a reflecting mirror. In addition, the second reflecting member 142 is a magnifying glass similar to the reflecting member 40 of the embodiment.

[0052] Similar to the display 10 of the embodiment, the display unit 30 of the display 10 of the present variation is tilted relative to the irradiation surface 20a between the irradiation surface 20a and the reflective component 40 so that the interval between the first end portions of the irradiation surface 20a and the irradiated surface 30a in the vertical direction where the virtual image is formed is larger than the interval between the second end portions of the irradiation surface 20a and the irradiated surface 30a in the vertical direction where the virtual image is formed. However, the display 10 of the embodiment is configured to emit display light from the emission surface 30b of the display unit 30 toward the front of the vehicle. In contrast, the display 10 of the present variation is configured to emit display light from the emission surface 30b of the display unit 30 toward the vertical upper side (i.e., above the vehicle) or the vertical lower side (i.e., below the vehicle). Therefore, the display 10 of the present variation adopts the following structure.

[0053] The irradiation surface 20a and the irradiated surface 30a of this modification are respectively arranged with one end side of the orthogonal direction perpendicular to the vertical direction as the first end side and the other end side of the orthogonal direction perpendicular to the vertical direction as the second end side. Moreover, the light source 21 of this modification is arranged in plurality between the first light source position related to the irradiation light from the first end side of the irradiation surface 20a of this modification and the second light source position related to the irradiation light from the second end side of the irradiation surface 20a. The display unit 30 is tilted relative to the irradiation surface 20a between the irradiation surface 20a and the first reflecting component 141 so that the interval between the other ends of the irradiation surface 20a and the irradiated surface 30a is larger than the interval between the one ends of the irradiation surface 20a and the irradiated surface 30a.

[0054] In this example, the display light is emitted from the emission surface 30b of the display unit 30 toward the vertically upward side (that is, above the vehicle), and a virtual image ( Figure 7 ). Therefore, the irradiation surface 20a and the irradiated surface 30a shown here are respectively arranged with the front side of the vehicle as the first end and the rear side of the vehicle as the second end ( Figure 8 ). Moreover, the backlight unit 20 shown here includes a plurality of rows of light sources 21 arranged in the front-rear direction of the vehicle ( Figure 8 The display unit 30 shown here is tilted relative to the irradiation surface 20a between the irradiation surface 20a and the first reflection member 141 so that the distance between the ends of the irradiation surface 20a and the irradiated surface 30a on the vehicle front side is larger than the distance between the ends of the irradiation surface 20a and the irradiated surface 30a on the vehicle rear side ( Figure 7 ).

[0055] The control unit 50 of this modified example controls the backlight unit 20 so that the illuminance of the irradiated light from the irradiated surface 20a of the backlight unit 20 incident on the irradiated surface 30a of the display unit 30 is higher at one end than at the other end (i.e., higher at the end on the vehicle front side than at the end on the vehicle rear side), thereby reducing the uneven brightness of the display light emitted from the emission surface 30b of the display unit 30. That is, the control unit 50 makes the illuminance of the irradiated light from the irradiated surface 20a of the backlight unit 20 incident on the irradiated surface 30a of the display unit 30 higher at one end than at the other end (i.e., higher at the end on the vehicle front side than at the end on the vehicle rear side), and makes the brightness L(θ) at one end of the emission surface 30b of the display unit 30 higher than the brightness at the other end (i.e., the brightness at the end on the vehicle front side is higher than the brightness at the end on the vehicle rear side), thereby reducing the uneven brightness of the display light emitted from the emission surface 30b on the entire emission surface 30b.

[0056] Specifically, the control unit 50 of this modified example makes the brightness of the light source 21 arranged on the side of the first light source position (i.e., the front of the vehicle) in the arrangement direction of the light sources 21 in the backlight unit 20 higher than the brightness of the light source 21 arranged at the second light source position (i.e., the end on the rear side of the vehicle), so that the illuminance of the irradiated light from the irradiated surface 20a of the backlight unit 20 that is incident on the irradiated surface 30a of the display unit 30 is higher at one end than the other end (i.e., the end on the front side of the vehicle than the end on the rear side of the vehicle).

[0057] The vehicle display device 2 of this modification can obtain the same effects as those of the vehicle display device 1 of the embodiment even if the first reflecting member (reflecting mirror) 141 is interposed between the display 10 and the second reflecting member (magnifying glass) 142 .

[0058] Description of Reference Numerals

[0059] 1.2 Vehicle display device

[0060] 10 Display

[0061] 20 Backlight unit

[0062] 20a Irradiated surface

[0063] 21 Light Source

[0064] 30 Display Units

[0065] 30a Irradiated surface

[0066] 30b Ejection surface

[0067] 40 Reflective components

[0068] 50 Control Department

[0069] 61 Frame

[0070] 61a Opening

[0071] 141 first reflecting component

[0072] 142 second reflecting component

[0073] EB eye movement range

[0074] EP Eye Spot

[0075] Rwf Projected part

Claims

1. A vehicle display device, characterized in that: have: Frame; a display that emits display information as display light within the frame, wherein the display information is visually recognized as a virtual image by an occupant in the vehicle cabin; at least one reflecting member, wherein the at least one reflecting member reflects the display light emitted from the display in the frame and projects the display light to a projection target portion in the vehicle interior through the opening of the frame; and a control unit that controls the display light according to an eye point or an eye movement range of the occupant, the eye movement range being a range of the eye point in which the virtual image can be visually recognized, The display comprises: a backlight unit that diffuses and distributes light from a light source from an irradiation surface; and a light-transmitting plate-shaped display unit that transmits irradiation light incident from the irradiation surface to an irradiated surface and emits the irradiation light from an emission surface as the display light. The display unit is tilted relative to the irradiation surface between the irradiation surface and the reflective component arranged in the optical axis direction of the backlight unit relative to the irradiation surface so that the interval between the first end portions of the irradiation surface and the irradiated surface in the vertical direction forming the virtual image is larger than the interval between the second end portions of the irradiation surface and the irradiated surface in the vertical direction forming the virtual image. The control unit controls the backlight unit so that the illumination intensity of the irradiation light incident on the irradiated surface from the irradiation surface is higher at the first end than at the second end, thereby reducing uneven brightness of the display light emitted from the emission surface of the display unit.

2. The vehicle display device according to claim 1, characterized in that: A plurality of the light sources are arranged between a first light source position associated with the irradiation light from the first end of the irradiation surface and a second light source position associated with the irradiation light from the second end of the irradiation surface, The control unit makes the brightness of the light source arranged on the first light source position side in the arrangement direction of the light sources higher than the brightness of the light source arranged at the second light source position, and makes the illuminance of the irradiation light incident from the irradiation surface to the irradiated surface higher at the first end than at the second end.

3. The vehicle display device according to claim 1 or 2, characterized in that: The display unit is tilted relative to the irradiation surface so that when external light incident through the opening of the frame is reflected by the reflection member and reaches the emission surface, the external light reflected by the emission surface does not return toward the reflection member.

4. The vehicle display device according to claim 3, characterized in that: The control unit adjusts the illuminance of the irradiated light incident from the irradiated surface to the irradiated surface for each of the multiple divided areas into which the emitting surface of the display unit is divided, thereby reducing uneven brightness of the display light emitted from the emitting surface of the display unit.

5. The vehicle display device according to claim 1 or 2, characterized in that: A reflecting member is provided between the display and the opening of the frame, The irradiation surface and the irradiated surface are both arranged with the vertically upper side being the first end and the vertically lower side being the second end, The display unit is tilted relative to the irradiation surface between the irradiation surface and the reflection component so that the interval between the upper ends of the irradiation surface and the irradiated surface vertically above each other is larger than the interval between the lower ends of the irradiation surface and the irradiated surface vertically below each other. The control unit controls the backlight unit so that the illuminance of the irradiation light incident on the irradiated surface from the irradiation surface is higher at the upper end than at the lower end.

6. The vehicle display device according to claim 1 or 2, characterized in that: The vehicle display device includes a first reflecting member and a second reflecting member as the reflecting member, wherein the first reflecting member reflects the display light emitted from the display, and the second reflecting member reflects the display light reflected by the first reflecting member and projects the display light to the projection portion through the opening of the frame. The irradiation surface and the irradiated surface are both arranged in a configuration where one end side in a direction perpendicular to the vertical direction is the first end side and the other end side in the direction perpendicular to the vertical direction is the second end side, The display unit is tilted relative to the irradiation surface between the irradiation surface and the first reflecting member so that the interval between the irradiation surface and the one end of the irradiated surface is larger than the interval between the irradiation surface and the other end of the irradiated surface. The control unit controls the backlight unit so that the illuminance of the irradiation light incident on the irradiated surface from the irradiation surface is higher at the one end than at the other end.

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