Head-up display device

Abstract

A head-up display device (1) is provided with a housing (10) and a display unit (20). The housing (10) has an opening (11) facing a windshield (WS), and a display unit (20) is incorporated in the housing (10). The display unit (20) is configured to include a display (21), a mirror (22), and a transparent cover (23). The display (21) is housed inside the housing (10) and emits display light (L1). The mirror (22) is housed inside the housing (10), and reflects amplified display light (L2), which is obtained by amplifying the display light (L1) emitted from the display (21), toward the windshield (WS) via the opening (11). The transparent cover (23) is a cover that closes the opening (11) and transmits the light, and has a free-form surface (232a) that corrects aberration of the amplified display light (L2) reflected by the mirror (22).

Description

Technical Field

[0001] The invention relates to a head-up display device. Background Art

[0002] Conventionally, as a head-up display device, for example, a head-up display for a vehicle that displays a virtual image through a front windshield of a vehicle is described in Patent Document 1. The head-up display for a vehicle includes: a housing that is disposed on a dashboard of a vehicle and has an opening that emits image light of an image; a display that is accommodated in the housing and emits image light of an image; a magnifying glass that is accommodated in the housing and magnifies and reflects an image that is directly incident from the display; and a lens that closes the opening of the housing and magnifies the image that is incident from the magnifying glass and outputs it to the front windshield.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2006-91104 Summary of the invention

[0006] Technical problem that the invention aims to solve

[0007] However, in the vehicle head-up display described in Patent Document 1, for example, when displaying a larger virtual image, it is difficult to correct the aberration of the virtual image using only a magnifying glass, and there is room for further improvement in this regard.

[0008] Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a head-up display device capable of appropriately displaying a virtual image.

[0009] Technical solutions to the problem

[0010] In order to actively solve the above-mentioned problems and achieve the purpose, the head-up display device involved in the present invention is characterized in that it comprises: a display unit, which is arranged in a vehicle and uses a light-transmitting reflective component to reflect display light emitted toward the reflective component toward the eye point side, thereby displaying a virtual image; and a shell, which has an opening portion opposite to the reflective component and is assembled with the display unit, and the display unit is configured to include: a display, which is accommodated in the interior of the shell and emits the display light; a reflector, which is accommodated in the interior of the shell and reflects amplified display light emitted from the display toward the reflective component via the opening; and a transparent cover, which is a cover that closes the opening and transmits light, and has a free-form surface that performs aberration correction on the amplified display light reflected by the reflector.

[0011] Effects of the Invention

[0012] The head-up display device according to the present invention can correct the aberration of a virtual image generated by an optical component including a reflective component by means of a free-form surface of a transparent cover. The head-up display device mainly performs the aberration correction function by the transparent cover, and mainly performs the magnification function by the reflector, thereby appropriately performing the aberration correction and magnification processing of the virtual image. As a result, the head-up display device can appropriately display the virtual image. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram showing a configuration example of a head-up display device according to an embodiment.

[0014] Figure 2 It is a perspective view showing a configuration example of a transparent cover according to an embodiment. DETAILED DESCRIPTION

[0015] The mode (embodiment) for implementing the present invention is described in detail with reference to the accompanying drawings. The present invention is not limited to the contents described in the following embodiments. In addition, the constituent elements described below include elements that can be easily thought of by those skilled in the art, and substantially the same elements. Furthermore, the structures described below can be appropriately combined. In addition, various omissions, substitutions or changes in the structure can be made within the scope of the gist of the present invention.

[0016] [Example]

[0017] The head-up display device 1 involved in the embodiment is described with reference to the accompanying drawings. The head-up display device 1 is arranged in a vehicle, and causes the display light L1 emitted toward the windshield WS that can transmit light to be reflected on the windshield WS toward the eye point EP side, thereby displaying a virtual image S. Here, the windshield WS is an example of a reflective component, which is a component formed of transparent glass in a plate shape, and is arranged in front of the driver's seat to block the wind. The head-up display device 1 can be an AR-HUD device that overlaps the virtual image S with the object in front of the vehicle (for example, a person, a sign, another vehicle, etc.) and displays it in an overlapping manner. In addition, it can also be a HUD device that displays the virtual image S without overlapping the virtual image S with the object in front of the vehicle. The head-up display device 1 is described in detail below.

[0018] Here, the direction along the vehicle width direction of the vehicle is referred to as the first direction X, the direction along the full length direction of the vehicle is referred to as the second direction Y, and the direction along the up-down direction of the vehicle is referred to as the third direction Z. The second direction Y can also be said to be a direction along the straight direction of the vehicle. The third direction Z can also be said to be a direction along the vertical direction. The first direction X, the second direction Y, and the third direction Z intersect with each other, and are typically orthogonal to each other. In addition, the first direction X and the second direction Y can also be said to be directions along a horizontal plane orthogonal to the vertical direction.

[0019] like Figure 1 As shown, the head-up display device 1 includes a housing 10 and a display unit 20 .

[0020] The housing 10 is provided in the vehicle and is used to assemble the display unit 20. The housing 10 is formed in a box shape, and a display 21 and a reflector 22 of the display unit 20 described later are housed inside the housing 10. The housing 10 has an opening 11 that connects the inside with the outside. The opening 11 is provided opposite to the windshield WS and is a portion through which light can pass.

[0021] The display unit 20 reflects the display light L1 emitted toward the windshield WS toward the eye point EP side of the windshield WS, thereby displaying a virtual image S. The display unit 20 includes a display 21 , a reflective mirror 22 , and a transparent cover 23 .

[0022] The display 21 emits display light L1 including an image, and is accommodated in the interior of the housing 10. The display 21 is configured to include, for example, a display and a backlight. The display forms an image, and is, for example, composed of a TFT-LCD (Thin Film Transistor-LiquidCrystal Display) or the like. The backlight irradiates light to the back of the display, and is, for example, composed of a plurality of LEDs (light-emitting diodes) or the like. The display 21 irradiates light to the display through the backlight, thereby emitting display light L1 including an image from the display toward the reflector 22. The display 21, for example, directly emits the display light L1 to the reflector 22 without passing through other reflectors. That is, there is no optical component between the display 21 and the reflector 22.

[0023] In addition, in this example, in the display 21, a part of the display 21 is accommodated inside the housing 10, and the other part of the display 21 is exposed outside the housing 10. Specifically, in the display 21, the emitting portion (for example, the display portion) that emits the display light L1 is accommodated inside the housing 10, and the portion other than the emitting portion of the display 21 (for example, the backlight source) is exposed outside the housing 10.

[0024] The reflector 22 totally reflects light and is accommodated inside the housing 10. The reflector 22 has a reflective surface 221 formed in a concave shape and aspherical. The reflective surface 221 is arranged opposite to the display 21 and opposite to the transparent cover 23. The reflector 22 amplifies the display light L1 (image) emitted from the display 21 through the reflective surface 221, and reflects the amplified display light L2 toward the windshield WS via the opening 11 (transparent cover 23) of the housing 10. Specifically, the reflector 22 amplifies the display light L1 directly emitted from the display 21 without passing through other reflectors through the reflective surface 221, and reflects the amplified display light L2 toward the windshield WS via the opening 11 (transparent cover 23) of the housing 10.

[0025] The transparent cover 23 is a cover that closes the opening 11 of the housing 10 and allows light to pass through. The transparent cover 23 is formed of a transparent resin in a curved plate shape and closes the opening 11. The transparent cover 23 has a curved portion 230 that is curved toward the inside of the housing 2. That is, the curved portion 230 is formed in a concave shape toward the inside of the housing 2. Figure 2 As shown, the curved portion 230 has an outer side surface portion 231 as a second side surface portion and an inner side surface portion 232 as a first side surface portion.

[0026] The outer surface portion 231 is located on the side opposite to the reflector 22 side, and is a surface formed by bending toward the inside of the housing 2. That is, the outer surface portion 231 is a surface provided on the windshield WS side. The outer surface portion 231 reflects external light toward the folded edge portion F. Here, the folded edge portion F shields light and is vertically provided on the side opposite to the eye point EP side of the opening portion 11. That is, the folded edge portion F is a wall portion extending along the third direction Z on the side opposite to the eye point EP side of the transparent cover 23. In this example, the folded edge portion F is provided slightly inclined toward the transparent cover 23 side. The outer surface portion 231 is formed in a shape that reflects external light incident from the outside of the housing 2 toward the folded edge portion F. Specifically, the XZ cross section of the outer surface portion 231 cut along the first direction X and the third direction Z is not curved but is formed in a straight line. In addition, the YZ cross section of the outer surface portion 231 cut along the second direction Y and the third direction Z is formed in a curved shape, and is formed in a curved shape with a curvature that can reflect external light toward the folded edge portion F. The outer surface portion 231 reflects external light incident from the outside of the housing 2 toward the hem portion F.

[0027] The inner side surface portion 232 is located on the side of the reflector 22 and is a face portion formed by bending toward the inside of the housing 2. That is, the inner side surface portion 232 is a face portion provided on the side opposite to the windshield WS side. The inner side surface portion 232 has a free curved surface 232a. The free curved surface 232a has a curved surface that cannot be expressed by a simple mathematical formula like a sphere, a cylinder, etc. The free curved surface 232a is, for example, a curved surface that is expressed by setting a plurality of intersections and curvatures in space and interpolating each intersection by a high-order polynomial. The free curved surface 232a is formed into a shape that corrects the aberration of the virtual image S generated by an optical component including the windshield WS, etc. The free curved surface 232a is, for example, formed into a shape that corrects the aberration of the virtual image S generated by the shape of the windshield WS. The transparent cover 23 corrects the aberration of the enlarged display light L2 reflected by the reflector 22 through the free curved surface 232a. Then, the transparent cover 23 emits the corrected magnified display light L2 having undergone aberration correction by the free curved surface 232a toward the windshield WS. The corrected magnified display light L2 emitted toward the windshield WS is reflected toward the eye point EP by the windshield WS and guided to the eye point EP.

[0028] As described above, the head-up display device 1 according to the embodiment includes a housing 10 and a display unit 20. The housing 10 has an opening 11 facing the windshield WS, and is assembled with the display unit 20. The display unit 20 is provided in a vehicle, and displays a virtual image S by reflecting the display light L1 emitted toward the windshield WS that can transmit light on the side of the windshield WS toward the eye point EP. The display unit 20 described above is configured to include a display 21, a reflector 22, and a transparent cover 23. The display 21 is accommodated in the housing 10 and emits the display light L1. The reflector 22 is accommodated in the housing 10, and reflects the enlarged display light L2 obtained by enlarging the display light L1 emitted from the display 21 toward the windshield WS through the opening 11. The transparent cover 23 is a cover that closes the opening 11 and transmits light, and has a free-form surface 232a that corrects the aberration of the enlarged display light L2 reflected by the reflector 22.

[0029] According to this structure, the head-up display device 1 can correct the aberration of the virtual image S generated by the optical components including the windshield WS, etc., by the free curved surface 232a of the transparent cover 23. In addition, the head-up display device 1 makes the transparent cover 23 mainly bear the function of aberration correction, and makes the reflector 22 mainly bear the function of magnification to share the role, thereby improving the accuracy of aberration correction and improving the magnification. The head-up display device 1 can reduce the parameter coefficient by sharing the role, so it can be easily manufactured, thereby reducing the tolerance. In the head-up display device 1, the transparent cover 23 that closes the opening 11 of the housing 10 also has the function of aberration correction, thereby suppressing the increase in the number of components and suppressing the enlargement of the optical system. As a result, the head-up display device 1 can appropriately display the virtual image S.

[0030] In the head-up display device 1, the display 21 directly emits the display light L1 toward the reflector 22. The reflector 22 reflects the enlarged display light L2 obtained by enlarging the display light L1 directly emitted from the display 21 toward the windshield WS via the transparent cover 23. According to this structure, in the head-up display device 1, the display 21 directly emits the display light L1 toward the reflector 22 without passing through other reflectors, so that the device can be miniaturized.

[0031] In the head-up display device 1, the free curved surface 232a is formed on the reflector 22 side of the transparent cover 23. With this configuration, the head-up display device 1 can appropriately reflect external light toward the folded edge portion F through the outer surface portion 231 of the transparent cover 23 opposite to the reflector 22 side.

[0032] In the above description, an example is described in which the display 21 directly emits the display light L1 to the reflector 22 without passing through other reflectors. However, the present invention is not limited to this, and the display light L1 may be indirectly emitted to the reflector 22 via other reflectors.

[0033] In the above description, an example is described in which the free curved surface 232 a is formed on the reflector 22 side of the transparent cover 23 , but the present invention is not limited thereto and the free curved surface 232 a may be formed on the side of the transparent cover 23 opposite to the reflector 22 side.

[0034] The transparent cover 23 may have a function of amplifying the enlarged display light L2 (image) in addition to the function of correcting the aberration of the virtual image S by the free curved surface 232a. In this case, the transparent cover 23 amplifies the enlarged display light L2 (image) at a magnification smaller than the magnification of the reflector 22. For example, the transparent cover 23 amplifies the enlarged display light L2 (image) at a magnification of about 1 / 10 of the magnification of the reflector 22.

[0035] In addition to the function of amplifying the display light L1 (image) by the reflecting surface 221, the reflecting mirror 22 may also have the function of correcting the aberration of the virtual image S. In this case, the reflecting mirror 22 corrects the aberration of the virtual image S with a smaller aberration correction amount than the transparent cover 23. For example, the reflecting mirror 22 corrects the aberration of the virtual image S with an aberration correction amount of about 1 / 10 of the aberration correction amount of the transparent cover 23.

[0036] In the above description, an example in which the reflecting member is the windshield WS is described, but the present invention is not limited to this, and for example, a synthesizer or the like may also be used.

[0037] Explanation of symbols

[0038] 10 Housing

[0039] 11 Opening

[0040] 20 Display unit

[0041] 21 Display

[0042] 22 Reflector

[0043] 23 Transparent cover

[0044] 232a Free-form surface

[0045] EP Eye Spot

[0046] L1 Display light

[0047] L2 Amplified display light

[0048] S virtual image

[0049] WS windshield (reflective parts)

Claims

1. A head-up display device, characterized in that: have: A display unit, the display unit being provided in the vehicle and reflecting display light emitted toward the reflective member toward an eye point side by using a light-transmitting reflective member, thereby displaying a virtual image; as well as a housing having an opening facing the reflecting member and in which the display unit is assembled, The display unit is configured to include: a display, the display being received in the housing and emitting the display light; a reflector housed in the housing and reflecting the display light emitted from the display after amplifying the display light toward the reflective member via the opening; and A transparent cover is a cover that closes the opening and transmits light, and has a free-form surface that corrects aberration of the magnified display light reflected by the reflector.

2. The head-up display device according to claim 1, characterized in that: The display directly emits the display light toward the reflector, The reflector reflects the amplified display light obtained by amplifying the display light directly emitted from the display toward the reflective member via the transparent cover.

3. The head-up display device according to claim 1 or 2, characterized in that: The free-curved surface is formed on the reflector side of the transparent cover.

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