Patent Publication Number: US-2023154116-A1

Title: Vehicle head-up display device and method

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefits of priority to Korean Patent Application Nos. 10-2021-0158538 and 10-2021-0158539, filed on Nov. 17, 2021, of which the disclosure is incorporated herein by reference in their entirety. 
     TECHNICAL FIELD 
     Exemplary embodiments of the present disclosure relate to a vehicle head-up display device and method for implementing augmented reality, and more particularly, a vehicle head-up display device and method for implementing augmented reality, in which a plurality of image generation units can display a single image by superimposing a three-dimensional virtual image on a real image or background through an optical system. 
     BACKGROUND 
     In general, while a vehicle is driven, a driver drives checking vehicle information such as the driving speed of the vehicle, the rotation speed of an engine and the amount of fuel displayed on a front instrument panel. Since the front instrument panel is located in front of the driver&#39;s seat and the driver has to lower his/her eyes to check the vehicle information, it is not possible for the driver to continuously keep his/her eyes on the road, which increases the risk of an accident. 
     In order to solve this problem, a head-up display (hereinafter referred to as “HUD”) device, which makes the vehicle information into an image, is mounted on the windshield glass of a vehicle, and consists of a projector that projects various pieces of information of a traveling vehicle, a reflector that reflects a projected image, and a projection mirror that projects the reflected image on the windshield glass. Since the image projected on the windshield glass is shown in front of the vehicle through driver&#39;s sight, the driver can observe the image together with the front view during driving. 
     However, since the conventional head-up display provides only a virtual image to the windshield glass, there is a problem in that it is not possible to provide information on a real image recognized by the driver&#39;s sight during driving. Accordingly, there is a need to solve the problem. 
     The background art of the present disclosure is disclosed in Korean Patent Application Laid-Open No. 10-2005-0010429 published on Jan. 27, 2005 and entitled “POSITIONING DEVICE FOR HEAD UP DISPLAY IMAGE.” 
     SUMMARY 
     Various embodiments are directed to a vehicle head-up display device and method for implementing augmented reality, in which a plurality of image generation units may display a single image by superimposing a three-dimensional virtual image on a real image or background through an optical system. 
     In an embodiment, a vehicle head-up display device includes: a plurality of first image generation parts embedded in a vehicle body, and configured to provide flat and stereoscopic images in multiple directions; a first optical induction part configured to guide an image signal, provided by the first image generation parts, in one direction; and a first display part configured to implement the image signal, provided by the first optical induction part, as an image recognizable by a driver. 
     The first image generation parts include: a first image unit disposed to face one side of the first optical induction part, and configured to provide the flat image; and a second image unit slantly disposed on another side of the first optical induction part, and configured to provide the stereoscopic image. 
     The first optical induction part includes: a first optical unit formed by bonding two triangular prisms coated with a transparent material, and configured to guide the images of the first and second image units in one direction; and a second optical unit configured to guide an image signal passing through first optical unit to the first display part. 
     A reflective coating layer is formed in a bonding region of the first optical unit. 
     The first image generation parts include: a fifth image unit disposed to face one side of the first optical induction part, and configured to provide the flat image; a sixth image unit disposed to face another side of the first optical induction part, and configured to provide the flat image; and a seventh image unit slantly disposed on still another side of the first optical induction part, and configured to provide the stereoscopic image. 
     The first optical induction part includes: a fifth optical unit formed by bonding four triangular prisms coated with a transparent material, and configured to guide the images of the fifth to seventh image units in one direction; and a sixth optical unit configured to guide an image signal passing through the fifth optical unit to the first display part. 
     A reflective coating layer is formed in a bonding region of the fifth optical unit. 
     A distance between the fifth image unit and the fifth optical unit is different from a distance between the sixth image unit and the fifth optical unit. 
     The distance between the fifth image unit and the fifth optical unit and the distance between the sixth image unit and the fifth optical unit are movement distances of light. 
     In an embodiment, a vehicle head-up display device includes: a plurality of second image generation parts embedded in a vehicle body, and configured to provide flat and stereoscopic images; a second optical induction part configured to guide an image signal provided by the second image generation parts; and a second display part configured to implement the image signal, provided by the second optical induction part, as an image recognizable by a driver. 
     The second image generation parts include: a first generation unit disposed to face the second optical induction part, and configured to provide the flat image; and a second generation unit slantly disposed on the second optical induction part, and configured to provide the stereoscopic image. 
     The first generation unit and the second generation unit are disposed in up and down directions. 
     The second optical induction part includes: a first lens unit configured to reflect an image signal, which is provided by the first generation unit, downwards; a second lens unit disposed below the first lens unit, and configured to transmit light reflected by the first lens unit and reflect an image signal, which is provided by the second generation unit downwards; and a third lens unit configured to guide the image signal passing through the second lens unit to the second display part. 
     The first generation unit and the second generation unit are disposed in left and right directions. 
     The second optical induction part includes: a fifth lens unit configured to reflect an image signal provided by the second generation unit; a sixth lens unit disposed in front of the fifth lens unit, and configured to transmit light reflected by the fifth lens unit and reflect an image signal, which is provided by the first generation unit, forward; and a seventh lens unit configured to guide the image signal passing through the sixth lens unit to the second display part. 
     In an embodiment, a vehicle head-up display method includes: an image providing step in which a plurality of image generation parts embedded in a vehicle body provide flat and stereoscopic images; an image inducing step in which an optical induction part guides an image signal provided by the image generation parts; and an image implementing step in which a display part implements the image signal, provided by the optical induction part, as an image recognizable by a driver. 
     In a vehicle head-up display device and method according to the embodiments of the present disclosure, image generation parts provide a flat image recognized as a near image and a stereoscopic image recognized as a far image, which makes it possible to implement augmented reality in a head-up display. 
     Effects of the present disclosure are not limited to the aforementioned effects, and may include various effects within a range evident to those skilled in the art from the following description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a diagram schematically illustrating a vehicle head-up display device according to a first embodiment of the present disclosure. 
         FIG.  2    is a diagram schematically illustrating a case in which there are two first image generation parts according to the first embodiment of the present disclosure. 
         FIG.  3    is a diagram schematically illustrating a first optical induction part illustrated in  FIG.  2   . 
         FIG.  4    is a diagram schematically illustrating a case in which there are three first image generation parts according to the first embodiment of the present disclosure. 
         FIG.  5    is a diagram schematically illustrating a first optical induction part illustrated in  FIG.  4   . 
         FIG.  6    is a diagram schematically illustrating a vehicle head-up display device according to a second embodiment of the present disclosure. 
         FIG.  7    is a diagram schematically illustrating a first generation unit according to the second embodiment of the present disclosure. 
         FIG.  8    is a diagram schematically illustrating a second generation unit according to the second embodiment of the present disclosure. 
         FIG.  9    is a diagram schematically illustrating an optical induction part when image generation parts according to the second embodiment of the present disclosure are disposed in up and down directions. 
         FIG.  10    is a diagram schematically illustrating an optical induction part when the image generating parts according to the second embodiment of the present disclosure are disposed in left and right directions. 
         FIG.  11    is a flowchart schematically illustrating a vehicle head-up display method according to the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, a vehicle head-up display device and method will be described below with reference to the accompanying drawings through various exemplary embodiments. In such a process, the thicknesses of lines or the sizes of elements illustrated in the drawings may have been exaggerated for the clarity of a description and for convenience&#39; sake. Terms to be described below have been defined by taking into consideration their functions in the present disclosure, and may be changed depending on a user or operator&#39;s intention or practice. Accordingly, such terms should be defined based on the overall contents of this specification. 
       FIG.  1    is a diagram schematically illustrating a vehicle head-up display device  1  according to a first embodiment of the present disclosure. Referring to  FIG.  1   , the vehicle head-up display device  1  according to the first embodiment of the present disclosure includes a plurality of first image generation parts  10 , a first optical induction part  20 , and a first display part  30 . 
     The plurality of first image generation parts  10  are disposed at or embedded in a vehicle body and provide flat and stereoscopic images in multiple directions. For example, picture generation units (PGU) may be used as the first image generation parts  10 . 
     The first optical induction part  20  guides an image signal, which is provided by the first image generation parts  10 , in one direction. For example, the first optical induction part  20  may guide the image signal from the inside of the vehicle body. The image signal guided from the inside of the vehicle body by the first optical induction part  20  may be moved to the outside of the vehicle body. 
     The first display part  30  implements the image signal, provided by the first optical induction part  20 , as an image recognizable by a driver. For example, the first display part  30  may be formed on a front windshield. The vehicle head-up display device  1  may be modularized and mounted on the vehicle body, and the first display part  30  may be rotated to serve as a combiner for allowing the driver to recognize the image signal. 
       FIG.  2    is a diagram schematically illustrating a case in which there are two first image generation parts  10  according to the first embodiment of the present disclosure, and  FIG.  3    is a diagram schematically illustrating the first optical induction part  20  illustrated in  FIG.  2   . Referring to  FIGS.  2  and  3   , the first image generation parts  10  include a first image unit  11  and a second image unit  12 . 
     The first image unit  11  is disposed to face one side of the first optical induction part  20  and provides the flat image. For example, the first image unit  11  may display a vehicle state. The vehicle state may be vehicle-related information, e.g., a speed gauge, a driving mode, a target reaching distance, etc., or a notification and state display, e.g., communication, an unexpected situation and a vehicle abnormal state. 
     The second image unit  12  is slantly disposed on another side of the first optical induction part  20  and provides the stereoscopic image. For example, the second image unit  12  may transmit a display image obliquely in a lateral direction rather than a front direction and give a sense of distance to the image. The second image unit  12  may display a road surface condition. In addition, the second image unit  12  may provide a navigation driving guide, e.g., a left turn, a right turn, a straight road, a speed limit, etc., or an active response display for driving environment, e.g., intervehicle distance maintenance, rear-end collision assistance, speed display of a preceding vehicle, etc. 
     The second image unit  12  may irradiate an optical signal so as to have a slope “a” with respect to the first optical induction part  20  by itself or through side-reflection in a state of being slantly disposed, not facing the first optical induction part  20 . In this case, the slope “a” may be designed to be greater than 0 degree and less than 40 degrees. The driver may feel that the image provided by the second image unit  12  is farther than the image provided by the first image unit  11 , and augmented reality may be implemented. 
     The first optical induction part  20  includes a first optical unit  21  and a second optical unit  22 . 
     The first optical unit  21  is formed by boding two triangular prisms coated with a transparent material, and the first optical unit  21  guides the images of the first image unit  11  and the second image unit  12  in one direction. For example, the first optical unit  21  may be formed as a cube by conjoining or bonding a first mirror unit  211  and a second mirror unit  212  which are the triangular prisms. A reflective coating layer may be formed in a bonding region of the first mirror unit  211  and the second mirror unit  212 . The reflective coating layer may guide reflection through aluminum deposition, guide refraction by using a UV refractive resin, and split light into orthogonal polarization states by using a birefringent material. In addition, the reflective coating layer may guide images, which are introduced in various directions, in one direction. The light introduced into a first surface  281  of the first mirror unit  211  may be reflected by the reflective coating layer and pass through a fourth surface  284  of the first mirror unit  211 . The light introduced into a second surface  282  or a third surface  283  of the second mirror unit  212  may be refracted by the reflective coating layer and pass through the fourth surface  284  of the first mirror unit  211 . 
     The second optical unit  22  guides the image signal passing through the first optical unit  21  to the first display part  30 . For example, the second optical unit  22  may have a rounded shape and align the focus of the image signal reaching the first display part  30 . 
     In addition, a third optical unit  23  is formed in an interior material, and is disposed below the first display unit  30  to transmit the image signal reflected by the second optical unit  22 . 
       FIG.  4    is a diagram schematically illustrating a case in which there are three first image generation parts  10  according to the first embodiment of the present disclosure, and  FIG.  5    is a diagram schematically illustrating the first optical induction part  20  illustrated in  FIG.  4   . Referring to  FIGS.  4  and  5   , the first image generation parts  10  includes a fifth image unit  15 , a sixth image unit  16 , and a seventh image unit  17 . 
     The fifth image unit  15  is disposed to face one side of the first optical induction part  20  and provides the flat image. For example, the fifth image unit  15  may display a vehicle state. The vehicle state may be vehicle-related information, e.g., a speed gauge, a driving mode, a target reaching distance, etc., or a notification and state display, e.g., communication, an unexpected situation and a vehicle abnormal state. 
     The sixth image unit  16  is disposed to face another side of the first optical induction part  20  and provides the flat image. For example, the sixth image unit  16  may display a vehicle state. The vehicle state may be vehicle-related information, e.g., a speed gauge, a driving mode, a target reaching distance, etc., or a notification and state display, e.g., communication, an unexpected situation and a vehicle abnormal state. 
     The seventh image unit  17  is slantly disposed on still another side of the first optical induction part  20  and provides the stereoscopic image. For example, the seventh image unit  17  may transmit a display image obliquely in a lateral direction rather than a front direction and give a sense of distance to the image. The seventh image unit  17  may display a road surface condition. In addition, the seventh image unit  17  may provide a navigation driving guide, e.g., a left turn, a right turn, a straight road, a speed limit, etc., or an active response display for driving environment, e.g., intervehicle distance maintenance, rear-end collision assistance, speed display of a preceding vehicle, etc. 
     The seventh image unit  17  may irradiate an optical signal so as to have a slope “b” with respect to the first optical induction part  20  by itself or through side-reflection in a state of being slantly disposed, not facing the first optical induction part  20 . In this case, the slope “b” may be designed to be greater than 0 degree and less than 40 degrees. The driver may feel that the image provided by the seventh image unit  17  is farther than the images provided by the fifth and sixth image units  15  and  16 , and augmented reality may be implemented. 
     The first optical induction part  20  includes a fifth optical unit  25  and a sixth optical unit  26 . 
     The fifth optical unit  25  is formed by boding four triangular prisms coated with a transparent material, and the fifth optical unit  25  guides the images of the fifth to seventh image units  15  to  17  in one direction. For example, the fifth optical unit  25  may be formed as a cube by boding a first lens unit  251 , a second lens unit  252 , a third lens unit  253  and a fourth lens unit  254 , which are triangular prisms. A reflective coating layer may be formed in bonding regions of the first lens unit  251 , the second lens unit  252 , the third lens unit  253  and the fourth lens unit  254 . The reflective coating layer may guide reflection through aluminum deposition, guide refraction by using a UV refractive resin, and split light into orthogonal polarization states by using a birefringent material. In addition, the reflective coating layer may guide images, which are introduced in various directions, in one direction. The reflective coating layer may be selectively applied to guide an optical signal. 
     The first lens unit  251  and the second lens unit  252  are disposed to face each other, and the third lens unit  253  and the fourth lens unit  254  are disposed to face each other. Incident light introduced into the first lens unit  251  may be reflected and pass through the fourth lens unit  254 . Incident light introduced into the second lens unit  252  may be reflected and pass through the fourth lens unit  254 . Incident light introduced into the third lens unit  253  may pass through the fourth lens unit  254  facing the third lens unit  253 . 
     The sixth optical unit  26  guides the image signal passing through the fifth optical unit  25  to the first display part  30 . For example, the sixth optical unit  26  may have a rounded shape and align the focus of the image signal reaching the first display part  30 . 
     In addition, a seventh optical unit  27  is formed in an interior material, and is disposed below the first display part  30  to transmit the image signal reflected by the sixth optical unit  26 . 
     Meanwhile, a distance “x” between the fifth image unit  15  and the fifth optical unit  25  and a distance “y” between the sixth image unit  16  and the fifth optical unit  25  are different from each other. For example, when the distance “y” between the sixth image unit  16  and the fifth optical unit  25  is disposed to be longer than the distance “x” between the fifth image unit  15  and the fifth optical unit  25 , the image provided by the sixth image unit  16  is perceived to be farther away than the image provided by the fifth image unit  15 , which makes it possible to achieve a three-dimensional effect. The distance “x” between the fifth image unit  15  and the fifth optical unit  25  and the distance “y” between the sixth image unit  16  and the fifth optical unit  25  may refer to movement distances of light in addition to a distance between components. The movement distances of light may increase through light reflection. 
       FIG.  11    is a flowchart schematically illustrating a vehicle head-up display method according to the present disclosure. Referring to  FIG.  11   , the vehicle head-up display method according to the present disclosure may include an image providing step S 10 , an image inducing step S 20 , and an image implementing step S 30 , and be implemented through the head-up display device  1  according to the first embodiment. Hereinafter, the image providing step S 10  is represented as a first image providing step, the image inducing step S 20  is represented as a first image inducing step, and the image implementing step S 30  is represented as a first image implementing step. Image generation parts may be the first image generation parts  10 , an optical induction part may be the first optical induction part  20 , and a display part may be the first display part  30 . 
     In the first image providing step S 10 , the plurality of first image generation parts  10  embedded in a vehicle body provide flat and stereoscopic images in multiple directions. For example, the first image generation parts  10  may include the first image unit  11  configured to provide the flat image and the second image unit  12  configured to provide the stereoscopic image. In this case, the second image unit  12  may irradiate an optical signal in an oblique direction and provide the stereoscopic image. 
     In the first image inducing step S 20 , the first optical induction part  20  guides image signals, provided by the first image generation parts  10 , in one direction. For example, the first optical induction part  20  may implement images, provided by the plurality of first image generation parts  10 , as a single screen by using a beam splitter. That is, the first optical induction part  20  has a cube shape by bonding a plurality of prisms, and when two or more first image generation parts  10  emit light to different surfaces of the first optical induction part  20  as necessary, the light may be moved to one side of the first optical induction part  20 . 
     In the first image implementing step S 30 , the first display part  30  implements the image signal, provided by the first optical induction part  20 , as an image recognizable by the driver. In this case, an image signal provided by the first image unit  11  may be recognized as a near image, and an image signal provided by the second image unit  12  may be recognized as a far image. 
     An operation of the vehicle head-up display device  1  having the above-described configuration according to the first embodiment of the present disclosure is described below. 
     When the first image unit  11  and the second image unit  12  irradiate the images to the first optical unit  21  (refer to  FIGS.  2  and  3   ), the image signal of the first image unit  11  introduced into the first surface  281  of the first optical unit  21  passes through the fourth surface  284  of the first optical unit  21 , is reflected upward by the second optical unit  22 , and reaches the first display part  30 . In this case, the driver may recognize the vehicle state provided by the first image unit  11 . In addition, the image signal of the second image unit  12  introduced into the second surface  282  or the third surface  283  of the first optical unit  21  passes through the fourth surface  284  of the first optical unit  21 , is reflected upward by the second optical unit  22 , and reaches the first display part  30 . In this case, the driver may recognize the road surface condition provided by the second image unit  12 . Meanwhile, the driver may recognize that the image provided by the second image unit  12  is farther away than the image provided by the first image unit  11 . 
     When the fifth image unit  15 , the sixth image unit  16  and the seventh image unit  17  irradiate the images to the fifth optical unit  25  (refer to  FIGS.  4  and  5   ), the image signal of the fifth image unit  15  introduced into a first surface  291  of the fifth optical unit  25  passes through a fourth surface  294  of the fifth optical unit  25 , is reflected upward by the sixth optical unit  26 , and reaches the first display part  30 . In this case, the driver may recognize the vehicle state provided by the fifth image unit  15 . In addition, the image signal of the sixth image unit  16  introduced into a second surface  292  of the fifth optical unit  25  passes through the fourth surface  294  of the fifth optical unit  25 , is reflected upward by the sixth optical unit  26 , and reaches the first display part  30 . In this case, the driver may recognize the vehicle state provided by the sixth image unit  16 . Lastly, the image signal of the seventh image unit  17  introduced to a third surface  293  of the fifth optical unit  25  passes through the fourth surface  294  of the fifth optical unit  25 , is reflected upward by the sixth optical unit  26 , and reaches the first display part  30 . In this case, the driver may recognize the road surface condition provided by the seventh image unit  17 . Meanwhile, the driver may recognize that the image provided by the seventh image unit  17  is farther away than the images provided by the fifth and sixth image units  15  and  16 , and recognize perspective of the images due to a difference between the positions of the fifth image unit  15  and the sixth image unit  16  or between the movement distances of light. 
     In the vehicle head-up display device and method according to the first embodiment of the present disclosure, the first image generation parts  10  provide the flat image recognized as a near image and the stereoscopic image recognized as a far image, which makes it possible to implement augmented reality in a head-up display. 
       FIG.  6    is a diagram schematically illustrating a vehicle head-up display device  2  according to a second embodiment of the present disclosure. Referring to  FIG.  6   , the vehicle head-up display device  2  according to the second embodiment of the present disclosure includes a plurality of second image generation parts  50 , a second optical induction part  60 , and a second display part  70 . 
     The plurality of second image generation parts  50  are embedded in a vehicle body and provide flat and stereoscopic images. For example, picture generation units (PGU) may be used as the second image generation parts  50 . 
     The second optical induction part  60  guides an image signal, which is provided by the second image generation parts  50 . For example, the second optical induction part  60  may guide the image signal from the inside of the vehicle body. The image signal guided from the inside of the vehicle body by the second optical induction part  60  may be moved to the outside of the vehicle body. 
     The second display part  70  implements the image signal, provided by the second optical induction part  60 , as an image recognizable by a driver. For example, the second display part  70  may be formed on a front windshield. The vehicle head-up display device  2  may be modularized and mounted on the vehicle body, and the second display part  70  may be rotated to serve as a combiner for allowing the driver to recognize the image signal. 
       FIG.  7    is a diagram schematically illustrating a first generation unit  51  according to the second embodiment of the present disclosure, and  FIG.  8    is a diagram schematically illustrating a second generation unit  52  according to the second embodiment of the present disclosure. Referring to  FIGS.  7  and  8   , the second image generation parts  50  include the first generation unit  51  and the second generation unit  52 . 
     The first generation unit  51  is disposed to face the second optical induction part  60  and provides the flat image. For example, the first generation unit  51  may display a vehicle state. The vehicle state may be vehicle-related information, e.g., a speed gauge, a driving mode, a target reaching distance, etc., or a notification and state display, e.g., communication, an unexpected situation and a vehicle abnormal state. 
     The second generation unit  52  is slantly disposed on the second optical induction part  60  and provides the stereoscopic image. For example, the second generation unit  52  may transmit a display image obliquely in a lateral direction rather than a front direction and give a sense of distance to the image. The second generation unit  52  may display a road surface condition. In addition, the second generation unit  52  may provide a navigation driving guide, e.g., a left turn, a right turn, a straight road, a speed limit, etc., or an active response display for driving environment, e.g., intervehicle distance maintenance, rear-end collision assistance, speed display of a preceding vehicle, etc. 
     The second generation unit  52  irradiates an optical signal so as to have a slope “c” with respect to the second optical induction part  60  by itself or through side-reflection in a state of being slantly disposed, not facing the second optical induction part  60 . In this case, the slope “c” may be designed to be greater than 0 degree and less than 40 degrees. The driver may feel that the image provided by the second generation unit  52  is farther than the image provided by the first generation unit  51 , and augmented reality may be implemented. 
       FIG.  9    is a diagram schematically illustrating the second optical induction part  60  when the second image generation parts  50  according to the second embodiment of the present disclosure are disposed vertically in up and down directions. Referring to  FIG.  9   , the first generation unit  51  and the second generation unit  52  are disposed in the up and down direction. In addition, the second optical induction part  60  includes a first lens unit  61 , a second lens unit  62 , and a third lens unit  63 . 
     The first lens unit  61  reflects the image signal, provided by the first generation unit  51 , downwards. For example, the first lens unit  61  may be disposed to face the first generation unit  51 , and may be slantly disposed to reflect light to the second lens unit  62  disposed horizontally. 
     The second lens unit  62  is disposed below the first lens unit  61 , and the second generator  52  is disposed below the second lens unit  62 . The second lens unit  62  transmits the light reflected from the first lens unit  61 . The second lens unit  62  downwardly reflects the image signal provided from the second generation unit  52 . In this case, the second generation unit  52  may be disposed to have a slope, not facing the second lens unit  62 , and achieve a three-dimensional effect through an optical signal irradiated obliquely in a lateral direction of the second generation unit  52 . 
     The third lens unit  63  guides the image signal passing through the second lens unit  62  to the second display part  70 . For example, the third lens unit  63  may have a rounded shape and align the focus of the image signal reaching the second display part  70 . 
     In addition, a fourth lens unit  64  is formed in an interior material, and is disposed below the second display part  70  to transmit the image signal reflected by the third lens unit  63 . 
       FIG.  10    is a diagram schematically illustrating the second optical induction part  60  when the second image generation parts  50  according to the second embodiment of the present disclosure are disposed in left and right directions. Referring to  FIG.  10   , the first generation unit  51  and the second generation unit  52  are disposed in the left and right directions. The second optical induction part  60  includes a fifth lens unit  65 , a sixth lens unit  66 , and a seventh lens unit  67 . 
     The fifth lens unit  65  reflects the image signal provided by the second generation unit  52 . For example, the fifth lens unit  65  may be disposed in front of the second generation unit  52 , and be slantly disposed to reflect light to the sixth lens unit  66 . In this case, the second generation unit  52  may be disposed to have a slope, not facing the fifth lens unit  65 , and achieve a three-dimensional effect through an optical signal irradiated obliquely in a lateral direction of the second generation unit  52 . The fifth lens unit  65  may have a rounded shape so as to align the focus of the image signal. 
     The sixth lens unit  66  is disposed in front of the fifth lens unit  65 , transmits the light reflected by the fifth lens unit  65 , and reflects the image signal, which is provided by the first generation unit  51 , forward. For example, the sixth lens unit  66  may be disposed to face the first generation unit  51  on the same horizontal line. In addition, the sixth lens unit  66  may be slantly disposed to reflect the light to the seventh lens unit  67 . 
     The seventh lens unit  67  guides the image signal passing through the sixth lens unit  66  to the second display part  70 . For example, the seventh lens unit  67  may be slantly disposed, and have a rounded shape to align the focus of the image signal reaching the second display part  70 . 
     In addition, an eighth lens unit  68  is formed in an interior material, and is disposed below the second display part  70  to transmit the image signal reflected by the seventh lens unit  67 . 
     Referring to  FIG.  11   , the vehicle head-up display method according to the present disclosure may include an image providing step S 10 , an image inducing step S 20 , and an image implementing step S 30 , and be implemented through the head-up display device  2  according to the second embodiment. Hereinafter, the image providing step S 10  is represented as a second image providing step, the image inducing step S 20  is represented as a second image inducing step, and the image implementing step S 30  is represented as a second image implementing step. Image generation parts may be the second image generation parts  50 , an optical induction part may be the second optical induction part  60 , and a display part may be the second display part  70 . 
     In the second image providing step S 10 , the plurality of second image generation parts  50  embedded in a vehicle body provide flat and stereoscopic images. For example, the second image generation parts  50  may include the first generation unit  51  configured to provide the flat image and the second generation unit  52  configured to provide the stereoscopic image. In this case, the second generation unit  52  may irradiate an optical signal in an oblique direction and provide the stereoscopic image. 
     In the second image inducing step S 20 , the second optical induction part  60  guides image signals provided by the second image generation parts  50 . For example, the second optical induction part  60  may move image information of the first generation unit  51  and the second generation unit  52 , which are in a state of being disposed up and down, to the second display part  70 . In addition, the second optical induction part  60  may move image information of the first generation unit  51  and the second generation unit  52 , which are in a state of being disposed left and right, to the second display part  70 . 
     In the second image implementing step S 30 , the second display part  70  implements the image signal, provided by the second optical induction part  60 , as an image recognizable by the driver. In this case, an image signal provided by the first generation unit  51  may be recognized as a near image, and an image signal provided by the second generation unit  52  may be recognized as a far image. 
     An operation of the vehicle head-up display device  2  having the above-described configuration according to the second embodiment of the present disclosure is described below. 
     When the first generation unit  51  and the second generation unit  52  are disposed in the up and down directions (refer to  FIG.  10   ), the image signal provided by the first generation unit  51  is reflected by the first lens unit  61 , is moved downwards, passes through the second lens unit  62 , is reflected upwards by the third lens unit  63 , and reaches the second display part  70 . In this case, the driver may recognize the vehicle state provided by the first generation unit  51 . The image signal provided by the second generation unit  52  is reflected by the second lens unit  62 , is moved to the third lens unit  63 , is reflected upwards by the third lens unit  63 , and reaches the second display part  70 . In this case, the driver may recognize the road surface condition provided by the second generation unit  52 . Meanwhile, the driver may recognize that the image provided by the second generation unit  52  is farther away than the image provided by the first generation unit  51 . 
     When the first generation unit  51  and the second generation unit  52  are disposed in the left and right directions (refer to  FIG.  11   ), the image signal provided by the second generation unit  52  is reflected by the fifth lens unit  65 , passes through the sixth lens unit  66 , is reflected upwards by the seventh lens unit  67 , and reaches the second display part  70 . In this case, the driver may recognize the road surface condition provided by the second generation unit  52 . The image signal provided by the first generation unit  51  is reflected by the sixth lens unit  66 , is reflected upwards by the seventh lens unit  67 , and reaches the second display part  70 . In this case, the driver may recognize the vehicle state provided by the first generation unit  52 . Meanwhile, the driver may recognize that the image provided by the second generation unit  52  is farther away than the image provided by the first generation unit  51 . 
     In the vehicle head-up display device and method according to the second embodiment of the present disclosure, the second image generation parts  50  provide the flat image recognized as a near image and the stereoscopic image recognized as a far image, which makes it possible to implement augmented reality in a head-up display. 
     The present disclosure has been described above with reference to the embodiments illustrated in the accompanying drawings, but the embodiments are merely for illustrative purposes. A person having ordinary knowledge in the art to which the present disclosure pertains will understand that various modifications and other equivalent embodiments are possible from the embodiments. Accordingly, the true technical scope of the present disclosure should be defined by the following claims.