TW201723585A - Head-up display - Google Patents

Abstract

This invention provides a head-up display, which is adapted to reflect an image on a windshield or a plane combiner, the head-up display includes a picture generating unit, a curved mirror, and a concave mirror. The picture generating unit can generate an image light which traveling along a first optical path. The curved mirror is disposed on the first optical path and used to reflect the image light and to generate a first reflection image light traveling along a second optical path which is angled with the first optical path. The concave mirror is disposed on the second optical path and used to reflect the first reflection image light to generate a second reflection image traveling along a third optical path which is angled with the second optical path and intersects to the first optical path, so as to reflect the second reflection image on the windshield or the plane combiner.

Description

Head up display device

The present invention relates to a display device, and more particularly to a head-up display device.

The use of a head up display (HUD) in a car allows the driver to see important information on the dashboard without having to bow his head, so that the driver can observe the dashboard while driving while watching the road. Important information on.

The head-up display device is generally composed of a picture generating unit (PGU) capable of generating images, and a plurality of concave-convex mirrors for compensating for aberrations and magnifying images. Currently, the head-up display device can be divided into There are two types of windshield type HUD and combine type HUD.

In the windshield type head-up display device, the image generation unit generates images and sequentially transmits the images to the louver mirrors, thereby projecting the images onto the windshield of the automobile. In order to magnify and clearly present the image on the windshield, The lenticular mirror must be corrected for the curvature of the windshield of each car. However, the assembly tolerances of the windshield are very large, and even for a car of the same brand type, it is necessary to recalibrate the lenticular mirrors for the curvature of the individual windshields, resulting in additional cost and man-hours. Moreover, in order to allow the image to be projected far enough to the windshield for the driver to view, the equivalent object distance of the image must also increase, thereby causing the volume of the head-up display device to be effectively reduced.

In addition, in the case of the stacked image head-up display device, the windshield of the automobile is replaced with an additional exterior display screen, thereby projecting the image generated by the image generating unit onto the exterior display screen. The head-up display device mainly manufactures the exterior display screen into a concave mirror having a curvature, so that the head-up display device reduces the use of the concave-convex mirror, thereby effectively reducing the volume of the head-up display device. However, making the exterior display screen into a concave mirror having a curvature is expensive and difficult to process, and when the curvature of the exterior display screen is not accurately processed, the image projected thereon is deformed. In addition, the exterior display screen is usually coated with a film to make the image projected on it clearer, but the film may fall off due to the sun or high temperature environment, thereby affecting the image quality.

It can be seen that the above two types of head-up display devices each have the disadvantages to be improved, and further, since the angle between the windshield and the driver's horizontal viewing angle is usually between 25° and 35°, the exterior display screen and driving The angle of the horizontal viewing angle of the member is between 60° and 70°. Therefore, the two types of head-up display devices mentioned above must be for this angle difference. Different designs, of course, can not be used interchangeably. Therefore, how to effectively reduce the size of the head-up display device, reduce the production cost thereof, and allow the image generated by the same head-up display to be projected not only on the windshield but also on the external display screen, is a person skilled in the art. The subject to be solved.

Accordingly, it is an object of the present invention to provide a head-up display device that can be simultaneously applied to a windshield of a vehicle and an exterior display screen.

Therefore, the head-up display device of the present invention is adapted to be reflected on one of a windshield and an exterior flat screen of a vehicle and is viewable by a user, the head-up display device comprising an image generating unit and a curved surface Mirror, and a concave mirror.

The image generating unit is capable of generating image light traveling along a first optical path.

The curved mirror is located on the first optical path for reflecting the image light generated by the image unit to form a first reflected image light, the first reflected image light being along a second angle with the first optical path The light path travels.

The concave mirror is located on the second optical path, and the concave mirror is configured to reflect the first reflected image light to form a second reflected image light, the second reflected image light being angled along the second optical path and the first The third optical path, which is staggered by the optical path, travels and is reflected on one of the windshield and the exterior flat screen.

The effect of the present invention is to reduce the overall volume by causing the second reflected image light to travel along the third optical path that is at an angle to the second optical path and interlaced with the first optical path, and only needs to change the image. The generating unit, the curved mirror, and the concave mirror are in a relative relationship with the user, that is, reflected on the windshield or the exterior flat screen.

100‧‧‧ windshield

101‧‧‧Dashboard platform

200‧‧‧Outer flat screen

2‧‧‧Heading display device

21‧‧‧Image generation unit

22‧‧‧ curved mirror

23‧‧‧ concave mirror

OP ₁ ‧‧‧First light path

OP ₂ ‧‧‧Second light path

OP ₃ ‧‧‧The third light path

A‧‧‧first pattern

A’‧‧‧second pattern

θ ₁ ‧‧‧first angle

θ ₂ ‧‧‧second angle

L ₁ ‧‧‧first imaginary line

U‧‧‧Users

Other features and advantages of the present invention will be apparent from the description of the drawings, wherein: FIG. 1 is a schematic diagram illustrating an embodiment of the head-up display device of the present invention reflected on a windshield of a vehicle. FIG. 2 is a schematic view showing an aspect of the embodiment of the present invention reflected on an exterior flat screen; FIG. 3 is a partial schematic view for assisting the embodiment of FIG. 1 reflected in the vehicle FIG. 4 is a partial schematic view of another embodiment of the embodiment of FIG. a relationship between the first optical path, a second optical path, and a third optical path of the windshield or the exterior flat screen; 6 is a schematic view showing that the head-up display device of the present invention can adjust a concave mirror angle to change a user's viewing angle when reflected on the windshield; and FIG. 7 is a schematic view showing that the head-up display device of the present invention is reflected on the exterior surface At the time of the screen, the exterior flat screen or the concave mirror angle can be adjusted to change the user's viewing angle.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to Figures 1 and 2, an embodiment of the head-up display device 2 of the present invention is mounted under a dashboard platform 101 of a vehicle and includes an image generating unit 21, a curved mirror 22, and a concave mirror 23.

The image generation unit 21 generates a first optical path along a light image OP ₁ travels. The curved mirror 22 is located on the first optical path OP ₁ for reflecting the image light generated by the image unit 21 to form a first reflected image light, and the first reflected image light is along a first optical path. The OP ₂ angled second optical path OP ₂ travels. The concave mirror 23 is located on the second optical path OP ₂ for reflecting the first reflected image light to form a second reflected image light. The second reflected image light is angled with the second optical path OP ₂ and the first optical path OP ₁ interleaved third optical path OP ₃ travels to and away from the direction of the head-up display apparatus 2 is emitted. The first optical path OP ₁ is adjacent to the instrument panel platform 101 to the curved mirror 22 , and the second optical path OP ₂ is moved away from the instrument panel platform 101 and is at an angle with the curved mirror 22 to the concave mirror. twenty three.

Specifically, the image generating unit 21 and the curved mirror 22 are respectively disposed adjacent to the instrument panel platform 101, and the concave mirror 23 is disposed away from the instrument panel platform 101 and located in the image generating unit 21 and the curved mirror 22 between. In detail, a horizontal viewing line viewed by a user U can be defined, and the vertical distance of the image generating unit 21 from the curved mirror 22 to the horizontal viewing line is smaller than the vertical distance of the concave mirror 23 to the horizontal viewing line. Moreover, when the second reflected image light is reflected on the windshield 100, the curved mirror is disposed closest to the user U than the image generating unit 21 and the concave mirror 23, and the second reflective image is When the light is reflected on the exterior flat screen 200, the curved mirror 22 is disposed farthest from the user U than the image generating unit 21 and the concave mirror 23.

It should be noted that, with reference to FIG. 3 and FIG. 4, the position of the concave mirror 23 is not limited to that shown in FIG. 1 and FIG. 2, and may be disposed on the other opposite side of the image generating unit 21, and is presented as The position of the concave mirror 23 shown in Figs. 3 and 4 with respect to the image generating unit 21. When the concave mirror 23 is changed to the set position as shown in FIGS. 3 and 4, the setting conditions of the other elements are also set in the same manner as in the above-described FIG. 1 and FIG. In addition, the image generating unit 21, the curved mirror 22, and the concave mirror 23 can be disposed together in a casing (not shown) and mounted on the instrument panel platform 101, because the optical components are disposed on the The manner of the casing is well known to those skilled in the art and will not be described herein.

It should be noted that the head-up display device 2 of the present invention mainly enlarges the first reflected image light by the concave mirror 23 to generate the second reflected image light traveling along the third optical path OP ₃ . However, if the image light is enlarged only by the concave mirror 23, the enlarged image light is distorted and has an aberration problem. Therefore, in order to compensate for image distortion distortion and aberration problem, the present invention converts the image light into the first reflected image light by the curved mirror 22, thereby amplifying the second reflected image light generated by the concave mirror 23. Can be clearly imaged. The curved mirror 22 may be selected from one of a convex mirror and a concave mirror, as long as the concave mirror 23 can be compensated for aberration. Preferably, the curved mirror 22 of the embodiment is a concave mirror as an example. More preferably, the curvature radius of the curved mirror 22 and the concave mirror 23 can be adjusted correspondingly according to the imaging quality. Since the technical means of the adjustment is well known to those skilled in the art, no further details are provided herein.

In addition, in addition to adjusting the curved mirror 22 and the concave mirror 23, the image light generated by the image generating unit 21 can be adjusted to achieve imaging difference compensation. The effect, since the adjustment of this mode is also well known to those skilled in the art, will not be described herein.

The head-up display device 2 of the present invention effectively reduces the volume of the head-up display device 2 by interlacing the third optical path OP ₃ and the first optical path OP ₁ with each other, and the head-up display device 2 of the present invention further It is suitable for reflection on a windshield 100 or an exterior flat screen 200 of a vehicle for viewing by the user U.

Generally, the angle between the windshield 100 and the horizontal viewing angle of the user U (25°~35°) is generally smaller than the angle between the horizontal plane 200 of the exterior flat screen 200 and the user U (60°~70°). Therefore, existing head-up display devices must design different head-up display devices for this difference in viewing angle.

However, the head-up display device 2 of the present invention overcomes this disadvantage, and can apply the head-up display device 2 to the windshield 100 or the exterior surface without changing the internal structure of the head-up display device 2. Screen 200 does not require redesigning the heads-up display device 2 for both aspects. That is, when the head-up display device 2 of the present invention is to be separately reflected on the windshield 100 and the exterior flat screen 200, the head-up display device 2 is flipped back and forth by 180 degrees with respect to the user U, and according to the reflection. The position may finely adjust the overall inclination angle of the head-up display device 2.

Specifically, if the head-up display device 2 of the present invention is to be reflected on the windshield 100, the head-up display device 2 is mounted on a dashboard platform 101 of the vehicle as shown in FIG. The image generating unit 21 is moved away from the user U such that the concave mirror 23 is located between the image generating unit 21 and the user U, so that the second reflected image light is traveled by the third optical path OP ₃ and reflected thereon. Windshield 100.

Conversely, if the head-up display device 2 of the present invention is to be reflected on the exterior flat screen 200, the head-up display device 2 only needs to be flipped back and forth by 180 degrees so that the image-generating unit 21 is adjacent to the user U. Located between the concave mirror 23 and the user U, the second reflected image light can travel along the third optical path OP ₃ and be reflected between the windshield 100 and the instrument panel platform 101. The exterior flat screen 200 is mounted. That is to say, the head-up display device 2 of the present invention can achieve dual applications reflected by the windshield 100 and the exterior-mounted flat screen 200 by simply turning in the direction, that is, overcoming the difference in viewing angles. The above description is illustrated in FIGS. 1 and 2, and the present invention is not limited to this example.

In more detail, referring to FIG. 5, in order to more clearly explain the relationship between the curved mirror 22 and the concave mirror 23, FIG. 5 shows that the head-up display device 2 can be simultaneously applied to the windshield 100 and the same. A schematic view of the exterior flat screen 200. Defining a first imaginary line L ₁ perpendicular to the first optical path OP ₁ between the image generating unit 21 and the curved mirror 22, and the image generating unit 21, the curved mirror 22, and the concave mirror 23 The relative position of the person is fixed. When the second reflected image light is reflected on the windshield 100 and the second reflected image light is reflected on the exterior flat screen 200, the image generating unit 21 and the curved mirror 22, and the concave mirror 23, respectively, the first imaginary line L ₁ can be provided as a mirror image.

It should be noted that, because the head-up display device 2 of the present invention has been adjusted by the image generating unit 21, the curved mirror 22, and the concave mirror 23 to compensate for the aberration of the second reflected image light, Therefore, when the second reflected image light is directly reflected on the windshield 100 or the exterior flat screen 200, the percentage of distortion of the image formed is less than the critical value (2.5%) that can be resolved by the eyes of the user U. . That is, the head-up display device 2 can reflect not only the curvature with curvature The windshield 100 can also be directly reflected on a flat screen (ie, the exterior flat screen 200), thereby reducing the manufacturing cost of the existing curved screen. It is worth mentioning that the exterior flat screen 200 is a semi-reflective flat lens with partial reflection and partial penetration. Compared with the existing curved screen, the invention directly reflects on the exterior flat screen 200. The advantage is that the semi-reflection The cost of the exterior flat screen 200 of the flat mirror is low, and subsequent maintenance is also more convenient.

In addition, when the user U is viewing the rear view display device 2 after the windshield 100 (or the exterior flat screen 200), in order to adjust the crystal of the eye without feeling tired, the user U may further The distance between the eyes defining the user U and the virtual image I behind the windshield 100 (or the exterior flat screen 200) is greater than 1.5 meters.

Referring to Figure 5 again, when the second optical path when the OP ₂ by the curved mirror 22 travels to the concave mirror 23 having a mirror surface with a normal line of the angled the first angle [theta] ₁ of 22, and a concave mirror 23 with the The first normal angle of the angle is the second angle θ ₂ . In order to make the head-up display device 2 have a minimum height, the volume relationship of the first angle θ ₁ and the second angle θ ₂ can be adjusted, thereby reducing the volume of the head-up display device 2 and adjusting the first angle θ _{1 While} having a ratio of the ratio of the second angle θ ₂ , it is also possible to minimize the image aberration caused by imaging. Preferably, the ratio of the first angle θ ₁ to the second angle θ ₂ of the head-up display device 2 of the present invention is between 0.43 and 1.25.

In addition, when the head-up display device 2 wants to reflect an image on the windshield 100, the image of the image-generating unit 21 (indicated by the first pattern A) needs to be presented in an inverted manner (as shown in FIG. 5). The third light path (the light path reflected by the OP ₃₂ on the windshield 100 is reflected by the OP ₃₂ ) is reflected on the windshield 100, and the virtual image generated after the windshield 100 exhibits an erect first pattern. A; and when the head-up display device is to reflect an image on the exterior flat screen 200, the image of the image generating unit 21 (indicated by the second pattern A') is presented in an upright manner (as shown in FIG. 5). And the third optical path (the OP ₃₁ represents the light path reflected on the exterior flat screen 200) is reflected on the exterior flat screen 200, and the virtual image generated after the exterior of the external flat screen 200 is positive. The second pattern A' is set.

For a clearer explanation, the same experimental data of the same head-up display device 2 can be reflected on the windshield 100 or reflected on the exterior flat screen 200 by only rotating 180 degrees. Organized in Table 1 and Table 2 below.

From the optical path parameters of Tables 1 and 2, the distance (mm) represents the relative distance between each component in the head-up display device 2, the user U and the virtual image I, wherein the positive and negative values are the difference in direction. . In this embodiment, the image generating unit The distance from 21 to the curved mirror 22 is 120 mm (see column 3 of Table 1 and column 3 of Table 2), and the distance from the curved mirror 22 to the concave mirror 23 is 80 mm (see Table 3, column 3 and Table 2). Column 3)).

In addition, the inclination angles shown in Table 1 and Table 2 indicate the angle between the second optical path OP ₂ and the third optical path OP ₃ respectively from the normal line of the curved mirror 22, the angle with the normal of the concave mirror 23, and The normal angle of the windshield 100 or the exterior flat screen 200. Specifically, the angle between the second optical path OP ₂ and the normal of the curved mirror 22 is 10.5° (that is, the first angle θ ₁ ), and the angle between the second optical path OP ₂ and the normal of the concave mirror 22 is 19 . ° (i.e., the second angle θ _2), and the third optical path OP ₃ and the angle of the windshield 100 normal to the plane of the outer screen 200 is respectively 66 ° and 30 °, it can be seen, the present In the embodiment, the ratio of the first angle θ ₁ to the second angle θ ₂ is 0.552.

Referring to Figure 6, it is worth mentioning here that, when the head-up display apparatus 2 when reflected on the windshield 100, the user U of the concave mirror 23 according to different perspectives is rotated to change the third optical path OP ₃ of The direction is reflected at different positions of the windshield 100, and is more suitable for different users.

Referring to Figure 7, in the same manner, the head-up display when the reflecting means 2 mounted on a flat screen 200 when the outside, but also by rotating the concave mirror 23, changing the direction of the third optical path OP _3, and is reflected to the exterior plane Different locations of screen 200. In addition, since the exterior flat screen 200 is fixedly mounted on the instrument panel platform 101, it can be rotatably and movably disposed on the instrument panel platform 101. Therefore, when the exterior flat screen 200 is rotatably disposed on the instrument panel platform 101, the exterior flat screen 200 can be rotated only according to the viewing angle of the user U, without rotating the concave mirror 23 The effect of adjusting the imaging position can be achieved.

In summary, the head-up display device 2 of the present invention has a vertical distance from the curved mirror 22 to the horizontal viewing line by the vertical distance of the image generating unit 21 and the curved mirror 22, and when When the second reflected image light is reflected on the windshield 100, the curved mirror is disposed closest to the user U than the image generating unit 21 and the concave mirror 23, and when the second reflected image light is reflected on the outside When the flat screen 200 is mounted, the curved mirror 22 is disposed farthest from the user U than the image generating unit 21 and the concave mirror 23, and the concave mirror 23 is disposed on opposite sides of the image generating unit 21. wherein one, so that the second reflected light image and _a staggered along the second optical path OP and OP ₂ at an angle to the first optical path to the third optical path _{OP. 3} travels, and can let the image generation unit 21 When the relative position of the curved mirror 22 and the concave mirror 23 is fixed, the head-up display device 2 is rotated by 180 degrees, so that the internal structure of the head-up display device 2 can be changed without being changed. Windshield 100 and the The ratio of the first angle θ ₁ to the second angle θ ₂ is further adjusted on one of the exterior flat screens 200, thereby reducing the overall volume of the head-up display device 2, so that The object of the invention.

However, the above description is only for the embodiments of the present invention, and the scope of the present invention cannot be limited thereto, and the scope and patent description of the patent application according to the present invention. The simple equivalent changes and modifications made by the contents of the book are still within the scope of the invention patent.

100‧‧‧ windshield

200‧‧‧Outer flat screen

21‧‧‧Image generation unit

22‧‧‧ curved mirror

23‧‧‧ concave mirror

OP ₁ ‧‧‧First light path

OP ₂ ‧‧‧Second light path

OP ₃₁ ‧‧‧The third light path

OP ₃₂ ‧‧‧The third light path

A‧‧‧first pattern

A’‧‧‧second pattern

θ ₁ ‧‧‧first angle

θ ₂ ‧‧‧second angle

L ₁ ‧‧‧first imaginary line

U‧‧‧Users

Claims (8)

A head-up display device adapted to reflect one of a windshield and an exterior flat screen of a vehicle and for viewing by a user, the head-up display device comprising: an image generating unit capable of generating an edge An image light traveling along a first optical path; a curved mirror located on the first optical path for reflecting the image light generated by the image unit to form a first reflected image light, the first reflected image light along a a second optical path that is at an angle to the first optical path; and a concave mirror on the second optical path, the concave mirror is configured to reflect the first reflected image light to form a second reflected image light, the second reflected image The light travels along a third optical path that is at an angle to the second optical path and is interlaced with the first optical path, and is reflected on one of the windshield and the exterior flat screen. The head-up display device of claim 1, wherein a horizontal viewing line viewed by the user is defined, and a vertical distance between the image generating unit and the curved mirror to the horizontal viewing line is smaller than the concave mirror to the horizontal viewing line a vertical distance, the concave mirror is disposed on one of opposite sides of the image generating unit, and when the second reflected image light is reflected on the windshield, the curved mirror is compared with the image generating unit and the concave mirror It is disposed closest to the user setting. When the second reflected image light is reflected on the exterior flat screen, the curved mirror is disposed farth from the user than the image generating unit and the concave mirror. The head-up display device of claim 2, wherein the concave mirror is disposed between the image generating unit and the curved mirror. The head-up display device of claim 1, wherein the second optical path has a first angle θ _{1 at} an angle to a normal of the curved mirror, and a second angle to a normal of the concave mirror The angle θ ₂ and the ratio of the first angle θ ₁ to the second angle θ ₂ are between 0.43 and 1.25. The head-up display device of claim 2, wherein when the second reflected image light is reflected on the windshield, the concave mirror is located between the image generating unit and the user, and the second reflected image light When reflected on the exterior flat screen, the image generating unit is located between the concave mirror and the user. The head-up display device of claim 5, wherein the relative positions of the image generating unit, the curved mirror, and the concave mirror are fixed, and a vertical light is defined to be located at the image generating unit and the curved surface. a first imaginary line between the mirrors, when the second reflected image light is reflected on the windshield and the second reflected image light is reflected on the exterior flat screen, the image generating unit, the curved mirror, And the concave mirrors are respectively mirrored on the first imaginary line. The head-up display device of claim 6, wherein the concave mirror is rotatable according to a viewing angle of the user when the second reflected image light is reflected on the windshield. The head-up display device of claim 6, wherein the concave mirror or the exterior flat screen is rotatable according to a user's perspective when the second reflected image light is reflected on the exterior flat screen.