Holographic head-up display system using multiple layers

Abstract

The present invention relates to a holographic head-up display system using multiple layers, including: an image generation unit disposed on the ceiling of a commercial vehicle and receiving driving information of the vehicle to generate and output an image; a mounting unit for mounting the image generation unit to the commercial vehicle and adjusting the position in which the image is outputted; and an image reproduction unit disposed on the windshield of the commercial vehicle and capable of reproducing the image generated by the image generation unit by transforming same into a holographic image having different senses of depth in accordance with the reproduction position.

Description

Holographic head-up display system using multilayers

[0001] The present invention relates to a holographic head-up display system using multilayers, and more particularly, to a holographic head-up display system using multilayers that can effectively display vehicle driving information and driving environment information by outputting images with different depths through multilayers in commercial vehicles, such as golf cars, to which a HUD system is not applied.

[0002]

[0003] Recently, vehicles are generally equipped with a cluster that displays various information related to the vehicle's driving status. The cluster displays various information such as the speedometer, fuel gauge, temperature gauge, and various warning lights, and the driver is designed to drive safely by looking at the cluster to understand the current driving status of the vehicle.

[0004]

[0005] Therefore, the cluster is installed on the front of the dashboard where the driver can easily see it while driving.

[0006]

[0007] However, drivers drive while checking the forward view through the windshield of the vehicle, and frequently move their gaze to the dashboard to check the cluster. This movement of gaze is frequent, and the focal length of the eyes changes significantly between the forward view and the scenery ahead. If this situation continues, fatigue can easily occur, and in particular, if the driver looks at the cluster while driving, the forward view can be lost, which can easily lead to an accident.

[0008]

[0009] To ensure driving safety for these drivers, the head-up display (HUD) is gaining attention as a device that effectively conveys vehicle driving information and surrounding information to the driver.

[0010]

[0011] A vehicle's head-up display is a display device that provides vehicle driving information or other information in a range that does not exceed the driver's main line of sight while the vehicle is being driven. Initially developed to be attached to aircraft, especially fighter jets, it has recently begun to be installed in vehicles as well.

[0012]

[0013] While driving at a speed of approximately 100 km / h, the time it takes to focus your gaze on the cluster and then look forward is approximately 2 seconds, or approximately 55 meters, so there is a risk. One way to reduce this risk is through the introduction of head-up displays, which project cluster information (speed, distance traveled, RPM, navigation information, etc.) onto the windshield in the driver's line of sight, allowing the driver to easily access driving information while driving.

[0014]

[0015] This allows drivers to maintain safe driving by recognizing important driving information without taking their eyes off the road ahead.

[0016]

[0017] However, in the case of conventional HUDs such as the above, most vehicle manufacturers install them by embedding them when manufacturing vehicles, so conventional vehicles without HUDs are formed so that driving information can be recognized by installing a separate HUD device on the top of the dashboard and projecting an image onto the windshield.

[0018]

[0019] In this case, since the driving information projected on the HUD is provided as a two-dimensional image, it is not clearly projected on the windshield, and there are limitations on the brightness, amount of information, and complexity of the projected image, so there was a problem that the driver could not accurately identify the driving information projected on the HUD, causing confusion.

[0020]

[0021] The purpose of the present invention to solve the above problems is to provide a holographic head-up display system using a multilayer that can be easily installed and adjusted to suit the vehicle environment by attaching and detaching to a golf car or a commercial vehicle, and that utilizes diffraction of a holographic optical element (HOE) to project necessary vehicle information and driving information to the driver as a three-dimensional image, thereby increasing the driver's visual efficiency and accelerating the response speed based on the driving information.

[0022]

[0023] In addition, another object of the present invention is to provide a holographic head-up display system using multilayers that outputs holographic images with different depths on a windshield according to priority and importance of information necessary for driving a vehicle, thereby enabling easy recognition of information.

[0024]

[0025] In addition, another object of the present invention is to provide a holographic head-up display system using multilayers that can display navigation guidance information according to distance so that the driver can intuitively understand the guidance information and reduce eye fatigue by aligning the driver's focus with a holographic image that matches the road conditions.

[0026]

[0027] The holographic head-up display system using a multilayer of the present invention for solving the above problem is characterized by including an image generating unit formed on the interior ceiling of a commercial vehicle and receiving driving information of the vehicle to generate and output an image, a mounting unit formed to mount and fix the image generating unit on the commercial vehicle and to adjust the image output position, and an image playback unit formed on the windshield of the commercial vehicle and capable of converting and playing back an image generated by the image generating unit into a holographic image with different depths depending on the playback position.

[0028]

[0029] In addition, the image reproduction unit of the holographic head-up display system using a multilayer of the present invention is characterized by comprising a long-distance optical element formed to have a magnification of 1:6 or more so that an image output from the image generation unit is reproduced at a long distance of 6 meters or more, and a short-distance optical element formed to have a magnification of 1:2 to 1:4 so that an image output from the image generation unit is reproduced at a short distance of 2 to 4 meters.

[0030]

[0031] In addition, the image reproduction unit of the holographic head-up display system using a multilayer of the present invention is characterized in that it forms a single holographic optical element by cutting different positions based on the optical center point while aligning the optical center points of holographic optical elements of the same size and different magnifications, and then joining the cut portions.

[0032]

[0033] In addition, the image reproduction unit of the holographic head-up display system using a multilayer of the present invention is formed of a holographic optical element whose magnification sequentially decreases from the top to the bottom, and the navigation information generated by the image generation unit moves from the top to the bottom according to the driving distance of the vehicle, thereby providing route guidance according to the actual driving environment.

[0034]

[0035] As described above, the holographic head-up display system using a multilayer according to the present invention can be easily installed and adjusted to suit the vehicle environment by being attachable to a golf car or a commercial vehicle, and by utilizing the diffraction of a holographic optical element (HOE), the vehicle information and driving information required by the driver are projected as a three-dimensional image, thereby increasing the visual efficiency of the driver and accelerating the reaction speed based on the driving information.

[0036]

[0037] In addition, according to the holographic head-up display system using a multilayer according to the present invention, information necessary for driving a vehicle is output as holographic images with different depths on the windshield according to priority and importance, thereby enabling information to be easily recognized.

[0038]

[0039] In addition, according to the holographic head-up display system using a multilayer according to the present invention, navigation guidance information is displayed according to the distance, so that the driver can intuitively understand the guidance information, and the driver's focus is aligned with the holographic image that matches the road conditions, so that eye fatigue can be reduced.

[0040]

[0041] Figure 1 is an example of use of a holographic head-up display system using a multilayer according to the present invention.

[0042] Figure 2 is a front view showing the holographic head-up display system using a multilayer according to the present invention installed.

[0043] Figure 3 is a perspective view showing the mounting structure of a holographic head-up display system using a multilayer according to the present invention.

[0044] Figure 4 is a perspective view showing an image generation unit of a holographic head-up display system using a multilayer according to the present invention.

[0045] Figure 5 is a cross-sectional view showing the inside of an image generation unit of a holographic head-up display system using a multilayer according to the present invention.

[0046] FIG. 6 is an exemplary diagram showing the structure of a multilayer holographic optical element of a holographic head-up display system using multilayers according to the present invention.

[0047] FIG. 7 is an optical schematic diagram for aligning the optical center point formed on the multilayer holographic optical element of the holographic head-up display system using a multilayer according to the present invention.

[0048] FIG. 8 is an optical schematic diagram of a long-range holographic optical element of a holographic head-up display system using a multilayer according to the present invention.

[0049] FIG. 9 is an optical schematic diagram of a near-field holographic optical element of a holographic head-up display system using a multilayer according to the present invention.

[0050] FIG. 10 is an exemplary diagram showing an image displayed at a close range and a long range using a holographic head-up display system using a multilayer according to the present invention.

[0051]

[0052] C: Vehicle

[0053] W: Windshield

[0054] F: Frame

[0055] 1: Laser

[0056] 2: aom

[0057] 3: Mirror

[0058] 4: SF

[0059] 5: Iris

[0060] 6: Lens

[0061] 7: Holographic optical elements

[0062] 8: Beam splitter

[0063] 100: Video generation unit

[0064] 110: Housing

[0065] 111: Opening hole

[0066] 112: Fixed

[0067] 113: Variable

[0068] 114: Control lever

[0069] 115: Accepted

[0070] 120: Laser module

[0071] 130: Control board

[0072] 140: Diffuser

[0073] 150: LCD panel

[0074] 200: Video playback section

[0075] 210: Long-range optical element

[0076] 220: Near-field optical element

[0077] 230: Optical center point

[0078] 240: First verse

[0079] 250: Second diffraction

[0080] 300: Mounting part

[0081] 310: Support

[0082] 320: Stand

[0083]

[0084]

[0085] The specific features and advantages of the present invention are described in detail below with reference to the accompanying drawings. If a detailed description of the functions and configurations of the present invention is deemed to unnecessarily obscure the gist of the invention, the detailed description will be omitted.

[0086]

[0087] The present invention relates to a holographic head-up display system using a multilayer, and more particularly, to a holographic head-up display system using a multilayer that can provide vehicle operation information and driving environment information through a HUD in a commercial vehicle, such as a golf car, to which a HUD system is not applied.

[0088]

[0089] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0090]

[0091] FIG. 1 is a diagram illustrating an example of use of a holographic head-up display system using a multilayer according to the present invention, FIG. 2 is a front view showing an installed holographic head-up display system using a multilayer according to the present invention, and FIG. 3 is a perspective view showing a structure of a mounting portion (300) of a holographic head-up display system using a multilayer according to the present invention.

[0092]

[0093] As illustrated in FIGS. 1 to 3, a holographic head-up display system using a multilayer according to the present invention is characterized by including an image generating unit (100) formed on the interior ceiling of a commercial vehicle (C) and configured to generate and output an image by receiving driving information of the vehicle (C), a mounting unit (300) formed to mount and fix the image generating unit (100) on the commercial vehicle (C) and to adjust the image output position, and an image playing unit (200) formed on the windshield (W) of the commercial vehicle (C) and configured to convert and play back an image generated by the image generating unit (100) into a holographic image having different depths depending on the playback position.

[0094]

[0095] In addition, the image playback unit (200) is formed of a holographic optical element and is characterized by outputting the image output from the image generation unit (100) as a three-dimensional image through diffraction.

[0096]

[0097] In addition, the image playback unit (200) is formed of a holographic optical element whose magnification sequentially decreases from the top to the bottom, and the navigation information generated from the image generation unit (100) moves from the top to the bottom according to the driving distance of the vehicle, thereby providing guidance according to the actual driving environment.

[0098]

[0099] In addition, the mounting part (300) is formed to be coupled to a frame (F) formed on the ceiling of a commercial vehicle (C) and is composed of a support (310) that distributes the load, and a mounting part (320) that is coupled to the support part (310) and is formed in a U shape so that the front and rear lower parts of the image generating part (100) can be mounted, and the mounting part (320) is characterized in that it can slide along the support part (310) to adjust the distance between the image generating part (100) and the image playing part (200) to enlarge or reduce the output image.

[0100]

[0101] The video generation unit (100) is used to communicate with a commercial vehicle (C) and generate and provide driving and vehicle (C)-linked information, such as current time, driving route, dangerous areas, and music information, to the driver.

[0102]

[0103] The image generation unit (100) is formed so that it can be installed and used in a commercial vehicle (C) that does not have a HUD, such as a golf car, and the image generation unit (100) is installed on the ceiling of the commercial vehicle (C) so that the image can be projected onto the windshield (W) to provide driving information and vehicle (C) information.

[0104]

[0105] In addition, the image output from the image generation unit (100) is projected onto the image playback unit (200), and the size of the output image varies depending on the projection distance, so the driver can adjust the image size according to the desired HUD size or the driving information or vehicle (C) information to be output.

[0106]

[0107] The mounting unit (300) is used to position the image generation unit (100) on the interior ceiling of a commercial vehicle (C) and adjust the angle and distance so that the image can be projected onto the image playback unit (200) formed on the windshield (W).

[0108]

[0109] The mounting unit (300) is used to mount the image generating unit (100) inside the vehicle (C), and is composed of a plurality of supports (310) formed to distribute the load by being coupled to a frame (F) formed on the commercial vehicle (C), and a mounting unit (320) coupled to the front and rear lower portions of the image generating unit (100) and fixed to the supports (310).

[0110]

[0111] The frame (F) refers to a skeleton formed in a square shape to form the ceiling of a commercial vehicle (C), and the support (310) can be connected to the frame (F) in a state where two profiles or rails are spaced apart according to the width of the image generating unit (100).

[0112]

[0113] In addition, the stand (320) coupled to the support (310) is formed in a U shape so that the upper part can be fixed by a bracket after being coupled between the supports (310), and the lower part can be in contact with and fixed to the lower surface of the image generating unit (100) so that the image generating unit (100) can be fixed to the support (310).

[0114]

[0115] At this time, it is preferable that the stand (320) be formed in two or more pieces so that the front and back of the image generation unit (100) can be respectively mounted and fixed, and a plurality of holes are provided on the inner surface of the stand (320) for coupling with the image generation unit (100), so that the stand can be coupled with the image generation unit (100) by bolts.

[0116]

[0117] In addition, it is preferable that the hole formed on the inner surface of the stand (320) be in the form of a slot so that the angle at which the image output from the image generating unit (100) is projected can be adjusted when the image generating unit (100) is connected by a bolt.

[0118]

[0119] In addition, in order to adjust the distance between the image generation unit (100) and the image playback unit (200), the support (310) may be formed with a rail, and a block that is bound to the support (310) and slides may be formed on the upper part of the stand (320), thereby allowing the distance of the image generation unit (100) coupled to the stand (320) to be freely adjusted.

[0120]

[0121] In this case, the stand (320) is formed to be fixed by being connected to the support (310) by a bracket, and when the bracket is separated, the block slides along the rail, allowing the position of the image generation unit (100) to be freely adjusted.

[0122]

[0123] As needed, a motor and a ball screw can be applied to automatically adjust the distance by moving the image generation unit (100) toward or away from the windshield (W) of the commercial vehicle (C) according to the driver's preference, and the irradiation angle of the image generation unit (100) can also be automatically adjusted.

[0124]

[0125] In addition, the distance and irradiation angle of the image generation unit (100) can be stored in memory, and the stored position can be automatically output according to the driver, so that the position of the image generation unit (100) can be adjusted to suit the driver.

[0126]

[0127] The image playback unit (200) is formed on the windshield (W) of a commercial vehicle (C) and is used to convert the image output from the image generation unit (100) into a holographic image so that the driver can view the image with a three-dimensional sense of depth.

[0128]

[0129] For this purpose, the image playback unit (200) is composed of a holographic optical element (HOE) and utilizes HOE diffraction to project driving information and vehicle (C) information necessary for the driver and output them on the windshield (W).

[0130]

[0131] By using holographic optical elements, it is possible to provide three-dimensional information through diffraction, which improves clarity and enables high-brightness production, and depending on the recording method, it is also possible to increase the size of the screen on which the HUD is output.

[0132]

[0133] In addition, since the holographic optical element formed in the image reproduction unit (200) is formed by combining holographic optical elements with different magnifications, the magnifications of the upper and lower portions are formed differently, so that the depth can be formed differently depending on the position where the image generated in the image generation unit (100) is projected on the holographic optical element.

[0134]

[0135] To this end, the holographic optical element formed in the image playback unit (200) has a high magnification long-distance optical element (210) arranged at the top and a low magnification short-distance optical element (210) arranged at the bottom, so that when an image is projected on the long-distance optical element (210), the user can feel as if a holographic image has been formed in front of the vehicle.

[0136]

[0137] In addition, when an image is projected on a short-range optical element (220), the user may feel as if a holographic image is formed at a close distance from the windshield (W) of the vehicle, so that the depth of the upper and lower positions where the image is projected on the image playback unit (200) may be different.

[0138]

[0139] At this time, a plurality of long-distance optical elements (210) and short-distance optical elements (220) can be formed with different magnifications, and through this, the magnification can be sequentially reduced from the top to the bottom of the holographic optical element, thereby enabling images of various magnifications to be output.

[0140]

[0141] Through this, information for route guidance provided by the navigation system can be displayed holographically at a distance in front of the vehicle, and as the vehicle approaches the location, the information for route guidance moves to the lower part of the holographic optical element formed in the image playback unit (200), so that the holographic information can be displayed at a close distance in front of the vehicle.

[0142]

[0143] In other words, information for route guidance is output holographically from a distance from the vehicle to provide a sense of depth, and as the vehicle approaches, it gets closer, allowing the driver to understand the route guidance information more clearly and intuitively.

[0144]

[0145] Additionally, the importance of required information may vary depending on road and driving conditions, and it is desirable to output vehicle information, such as warning lights required for vehicle operation, from the bottom of the holographic optical element so that users can easily recognize them.

[0146]

[0147] These holographic optical elements with different magnifications allow drivers to intuitively understand three-dimensional information, reducing eye fatigue. They also allow drivers to comfortably and continuously grasp necessary information by keeping their focus aligned with the road conditions even during continuous driving.

[0148]

[0149] Additionally, the images are output with different depth and size depending on the priority and importance of the information, allowing the driver to understand important information more clearly and easily and react appropriately to the driving environment.

[0150]

[0151] The technology for implementing a holographic optical element in which a plurality of arrays are formed will be described later with reference to the attached drawings.

[0152]

[0153] FIG. 4 is a perspective view showing an image generating unit (100) of a holographic head-up display system using a multilayer according to the present invention, and FIG. 5 is a cross-sectional view showing the inside of an image generating unit (100) of a holographic head-up display system using a multilayer according to the present invention.

[0154]

[0155] As shown in FIGS. 4 and 5, the image generating unit (100) of the holographic head-up display system using a multilayer according to the present invention comprises: a housing (110) having an open front, an empty interior, and a receiving box (115) formed on the lower surface; a plurality of laser modules (120) formed on the inner rear surface of the housing (110) so as to irradiate R, G, B laser light sources matching the recording wavelength of the holographic optical element; an LCD panel (150) formed on the front surface of the housing (110) for controlling liquid crystal cells to express driving information provided from a commercial vehicle (C) as an image; a diffuser (140) formed on the rear surface of the LCD panel (150) for diffusing the laser light source irradiated from the laser module (120) so as to transmit the laser light source through the liquid crystal cells of the LCD panel (150); and a diffuser (140) formed on the receiving box (115) of the housing (110) for communicating with the commercial vehicle (C) and generating driving information based on the driving information. It is characterized by including a control board (130) that electrically controls the liquid crystal of the LCD panel (150).

[0156]

[0157] In addition, the housing (110) is characterized by further including a fixed end (112) formed on the inner rear surface so as to support the front of the laser module (120), a variable end (113) formed so as to support the rear surface of the laser module (120) and formed so as to be movable in the front and rear directions, and a control lever (114) formed on the outer rear surface of the housing (110) and connected to the variable end (113) so as to move the variable end (113) in the front or rear direction depending on the rotational direction to pressurize and fix or separate the laser module (120).

[0158]

[0159] The housing (110) is formed so that the laser module (120), control board (130), diffuser (140), and LCD panel (150) used in the image generation unit (100) can be mounted inside, and is used to prevent each component from being damaged by external impact.

[0160]

[0161] In Fig. 4, the upper rear surface of the housing (110) is open, but this is only to express an open appearance to explain the internal structure, and in reality, the upper surface is covered.

[0162]

[0163] At this time, the front of the housing (110) is open and has a box shape with an empty interior. An LCD panel (150) and a diffuser (140) are combined on the open front, and three laser modules (120) are formed so that they can be mounted at regular intervals on the rear of the interior.

[0164]

[0165] In addition, an opening hole (111) is provided on the side of the housing (110) so that a cable for controlling power and operation of the LCD panel (150) and laser module (120) formed inside the housing (110) can be inserted, and a separate storage box (115) is provided on the lower front so that a control board (130) can be stored.

[0166]

[0167] Three laser modules (120) consisting of R, G, and B are formed on the inner rear surface of the housing (110), and each laser module (120) selectively irradiates laser toward the front of the housing (110) by the control board (130).

[0168]

[0169] At this time, the laser is close to the recording wavelength of the holographic light source (HOE), and by using a laser with a narrow bandwidth as a light source, the clarity of the image can be improved, and by combining the colors R, G, and B, it is possible to create a high-resolution and multi-color holographic image.

[0170]

[0171] The investigated laser is diffused through a diffuser (140) formed on the front of the housing (110) and passes through the LCD panel (150). The LCD panel (150) electrically controls the liquid crystal cells to adjust the light, thereby generating a clear image.

[0172]

[0173] In addition, since high-brightness bright light can be controlled based on the backlight of the LCD panel (150), the brightness of the holographic image output from the image playback unit (200) can be maintained.

[0174]

[0175] In particular, in the case of a conventional beam projector type holographic HUD including an LCOS module, the light source is ultimately transmitted through a diffuser (140), but there was a problem in that the brightness of the image was reduced due to the characteristics of the LCOS, and a blur phenomenon occurred due to the diffuser (140).

[0176]

[0177] In the present invention, since the diffuser (140) is formed on the rear side of the LCD panel (150) rather than at the end where the light source is transmitted, the clarity can be improved.

[0178]

[0179] The diffuser (140) is used to diffuse the laser light irradiated from the laser module (120) so that it is evenly distributed and introduced to the rear of the LCD panel (150). The function and principle of the diffuser (140) are already known technologies, so they will be omitted.

[0180]

[0181] The control board (130) is formed inside the receiving box (115) of the housing (110) and is formed to receive driving information by communicating with a commercial vehicle (C), so that the liquid crystal of the LCD panel (150) can be electrically controlled based on the received information and an output image can be generated by irradiating the laser module (120).

[0182]

[0183] At this time, the control board (130) has terminals exposed on the outside of the receiving box (115), so it can communicate with the commercial vehicle (C) via a cable or wirelessly communicate with the commercial vehicle (C) using Bluetooth or Wi-Fi.

[0184]

[0185] Additionally, in order to maintain the position of the laser module (120) coupled to the housing (110) constant, a flat step is provided on the upper surface of the inner rear surface of the housing (110) so that the laser module (120) can be mounted.

[0186]

[0187] On the front of the step, a number of fixed ends (112) protrude upward to support the laser module (120) so that it does not move forward, thereby fixing the laser module so that it does not move forward when mounted.

[0188]

[0189] At this time, it is preferable that the upper surface of the step where the fixed end (112) is formed has a groove that is dug inward to prevent the laser module (120) from moving left and right when inserted.

[0190]

[0191] The variable plate is formed in a plate shape so that the rear surfaces of three laser modules (120) that investigate R, G, and B can be simultaneously pressed, and is formed in a state separated from the steps.

[0192]

[0193] At this time, two control levers (114) are formed on the outer rear surface of the housing (110), and one end of the control lever (114) is formed as a screw-shaped shaft, and the other end is provided with a lever so that it can be rotated by hand, so that one end is screw-connected to the housing (110) and penetrates therethrough to be connected to the variable member.

[0194]

[0195] At this time, depending on the rotation direction of the control lever (114), the variable stage can move toward the front or rear of the housing (110), and the three laser modules of R, G, and B are pressed by the variable stage so that the front can be fixed in close contact with the fixed end (112).

[0196]

[0197] If replacement or repair of the laser module (120) is required, the adjustment lever (114) can be rotated in the opposite direction to separate the variable stage from the laser module (120), thereby easily separating the laser module (120) from the housing (110).

[0198]

[0199] FIG. 6 is an optical schematic diagram for manufacturing a holographic optical element of a holographic head-up display system using a multilayer according to the present invention.

[0200]

[0201] FIG. 6 is an exemplary diagram showing the structure of a multilayer holographic optical element (7) of a holographic head-up display system using a multilayer according to the present invention, and FIG. 7 is an optical schematic diagram for aligning an optical center point (230) formed on a multilayer holographic optical element (7) of a holographic head-up display system using a multilayer according to the present invention.

[0202]

[0203] As illustrated in FIGS. 6 and 7, the image reproduction unit (200) according to the present invention is characterized by comprising a long-distance optical element (210) formed to have a magnification of 1:6 or more so that an image output from the image generation unit (100) can be reproduced at a long distance of 6 meters or more, and a short-distance optical element (220) formed to have a magnification of 1:2 to 1:4 so that an image output from the image generation unit (100) can be reproduced at a short distance of 2 to 4 meters.

[0204]

[0205] In addition, the image playback unit (200) is characterized in that it forms a single holographic optical element (7) by aligning the optical center points (230) of holographic optical elements (7) of the same size and different magnifications, cutting different positions based on the optical center point (230), and then joining the cut portions.

[0206]

[0207] The holographic optical element (7) used in the image playback unit (200) has a multilayer in which the magnifications are formed differently from the top to the bottom. In order to form such a multilayer, each of the holographic optical elements (7) with different magnifications is cut and then connected to form the multilayer.

[0208]

[0209] At this time, in order to form each holographic optical element (7) having a different magnification into a single multilayer, it is necessary to prepare a plurality of holographic optical elements (7) having the same size and different magnifications, and to match the optical center point (230) where the image is projected.

[0210]

[0211] The optical center point (230) refers to the center point of the image projected from the image generation unit (100), and each holographic optical element (7) is formed to be connected to each other after cutting the range where the optical center point (230) does not overlap.

[0212]

[0213] For example, in a case where a long-distance optical element (210) having a magnification of 1:6, as in FIG. 6, and a short-distance optical element (220) having a magnification of 1:3 are to be formed into a single multilayer, non-overlapping sections of the long-distance optical element (210) and the short-distance optical element (220) are each cut based on the optical center point (230), and these are connected to form an image playback unit (200) having a multilayer.

[0214]

[0215] The image reproduction unit (200) having a multilayer is configured with a long-distance optical element (210) formed at an upper portion with a magnification of 1:6 to reproduce an image at a distance of 6 meters or more, and a short-distance optical element (220) formed at a magnification of 1:3 to reproduce an image at a distance of 3 meters or more.

[0216]

[0217] At this time, since the optical center points (230) on which the images are projected are aligned with those of the long-distance optical element (210) and the short-distance optical element (220), when the images are projected on the entire long-distance optical element (210) and the short-distance optical element (220) in a multi-layered state, the image projected on the long-distance optical element (210) is expressed holographically as if the image is reproduced at a long distance of 6 meters or more, and the image projected on the short-distance optical element (220) is expressed holographically as if the image is reproduced at a short distance of 3 meters or more.

[0218]

[0219] That is, the same image can reproduce holographic images with different depths depending on the section in which the long-distance optical element (210) or the short-distance optical element (220) is formed.

[0220]

[0221] Also, as shown in FIG. 7, in order to align the optical center point (230) of the holographic optical element (7), the signal beam is irradiated to the lower part of the holographic optical element (7) and the first diffraction (240) in which the laser (1) is projected from a distance of 6 meters at an angle of 30 degrees to the upper part, and the second diffraction (250) in which the laser (1) is irradiated from a distance of 3 meters are respectively generated so that the first diffraction (240) and the second diffraction (250) are projected to the same position in the center of the holographic optical element (7).

[0222]

[0223] Through this, an optical center point (230) that overlaps the first diffraction (240) and the second diffraction (250) is set, and the optical center points (230) of the long-distance optical element (210) and the short-distance optical element (220) are replicated based on the optical center point (230) to form a multilayer through cutting.

[0224]

[0225] FIG. 8 is an optical schematic diagram of a long-distance holographic optical element (7) of a holographic head-up display system using a multilayer according to the present invention, FIG. 9 is an optical schematic diagram of a short-distance holographic optical element (7) of a holographic head-up display system using a multilayer according to the present invention, and FIG. 10 is an exemplary diagram showing an image displayed at a short distance and a long distance in a holographic head-up display system using a multilayer according to the present invention.

[0226]

[0227] As shown in FIGS. 8 to 10, the optical schematic diagrams of the long-distance optical element (210) and the short-distance optical element (220) of the holographic head-up display system using a multilayer according to the present invention are as follows.

[0228]

[0229] Three lasers (1) of R, G, and B are combined into one beam through multiple mirrors (3), and are divided into two beams consisting of a reference beam and a signal beam through a beam splitter (8).

[0230]

[0231] A single laser (1) light source is divided into two beams (signal beam and reference beam) and the beams are incident in a spherical wave shape onto a holographic optical element (HOE) (7) recording medium in a specific direction.

[0232]

[0233] The incident angle and distance of the reference beam for the holographic recording medium are adjusted to the angle at which the light of the laser (1) module is incident on the holographic optical element (HOE) (7) from the screen and the distance traveled to the holographic optical element (HOE) (7).

[0234]

[0235] The incident angle and distance of the signal beam to the holographic recording medium are adjusted to the subjective observation angle and projection distance of the HUD image observed through the holographic optical element (HOE) (7), respectively, so that the holographic optical element (HOE) (7) can be manufactured.

[0236]

[0237] At this time, the signal beam is irradiated from a distance of 1000 mm and then incident at a 90-degree angle on the lower portion of the holographic optical element (7), and the reference beam is projected at a 30-degree angle at a distance of 6000 mm for a long distance and 3000 mm for a short distance by the mirror (3).

[0238]

[0239] Here, the distance between the long distance and the short distance can vary depending on the magnification formed in the holographic optical element (7).

[0240]

[0241] The image reproduction unit (200) having a multilayer formed through this process reproduces an image at a distance of 6 meters or more through the first diffraction (240) of the long-distance optical element (210) when an image is projected, and the image is reproduced at a short distance of 3 meters or more through the second diffraction (250) of the short-distance optical element (220), thereby allowing for a different sense of depth.

[0242]

[0243] As described above, according to the holographic head-up display system using a multilayer according to the present invention, the HUD can be easily installed and adjusted to suit the vehicle environment by being attachable and detachable to a golf car or a commercial vehicle, and by utilizing the diffraction of the holographic optical element (HOE) (7), vehicle information and driving information necessary for the driver are projected as a three-dimensional image, thereby increasing the visual efficiency of the driver and accelerating the reaction speed based on the driving information, and by outputting holographic images with different depths on the windshield according to the priority and importance of information necessary for driving the vehicle, the information can be easily recognized, and the guidance information of the navigation system is displayed according to the distance so that the driver can intuitively understand the guidance information, and by aligning the driver's focus with the holographic image that matches the road conditions, there is an effect of reducing eye fatigue.

[0244]

[0245] While the present invention has been described with reference to preferred embodiments, those skilled in the art will appreciate that various modifications and variations can be made to the invention without departing from the technical spirit and scope described in the claims. Therefore, the scope of the present invention should be construed in accordance with the claims, which are intended to encompass these numerous modifications.

Claims

1. An image generation unit formed on the interior ceiling of a commercial vehicle and receiving driving information of the vehicle to generate and output an image; A mounting part formed to fix the above image generating part to the commercial vehicle and to adjust the image output position; It is characterized by including an image reproduction unit formed on the windshield of the commercial vehicle and capable of converting and reproducing an image generated by the image generation unit into a hologram image with different depth depending on the reproduction position. Holographic head-up display system using multilayers.

2. In paragraph 1, The above video playback section A long-distance optical element having a magnification of 1:6 or greater and formed so that an image output from the image generating unit can be reproduced at a distance of 6 meters or greater; It is characterized by comprising a short-range optical element having a magnification of between 1:2 and 4 so that the image output from the image generating unit is reproduced at a short distance of between 2 and 4 meters; Holographic head-up display system using multilayers.

3. In paragraph 1, The above image playback unit is characterized in that it forms a single holographic optical element by cutting different positions based on the optical center point while aligning the optical center points of holographic optical elements of the same size and different magnifications, and then joining the cut portions. Holographic head-up display system using multilayers.

4. In paragraph 1, The above video playback section It is formed by a holographic optical element in which the magnification sequentially decreases from top to bottom. The navigation information generated by the above image generation unit is characterized in that it can guide the route according to the actual driving environment by moving from the top to the bottom according to the driving distance of the vehicle. Holographic head-up display system using multilayers.

Images