Holographic head-up display system with variable imaging distance using HOE screen

Abstract

The present invention relates to a holographic head-up display system with a variable imaging distance using a HOE screen, the holographic head-up display system comprising: a control unit which communicates with a commercial vehicle so as to generate driving information or driving environment information required for the commercial vehicle to drive; a first image generation unit which is formed on the inner ceiling of the commercial vehicle and receives the driving information or the driving environment information so as to generate a first image; a second image generation unit which is formed on the upper part of the first image generation unit and receives the driving information or the driving environment information so as to generate a second image; and a HOE lens which is formed on the windshield of the commercial vehicle and allows the first image and the second image to be displayed.

Description

A holographic head-up display system with variable imaging distance using a HOE screen

[0001] The present invention relates to a holographic head-up display system with a variable image distance using a HOE screen, and more specifically, to a holographic head-up display system with a variable image distance using a HOE screen that can display driving information and driving environment information three-dimensionally and adjust the sense of depth according to the driver's preference in commercial vehicles, such as golf carts, where a HUD system is not applied.

[0002]

[0003] Recently, vehicles are generally equipped with a cluster that displays various information related to the driving status of the vehicle. 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 look while driving.

[0006]

[0007] However, drivers drive while checking the forward view through the windshield and frequently shift their gaze to the dashboard to check the cluster. Since there is a lot of eye movement and frequent changes in the focal distance between the eyes and the scenery ahead, fatigue easily occurs if this situation continues. In particular, there is a high risk of accidents because the driver cannot check the forward view while looking at the cluster while driving.

[0008]

[0009] Head-Up Displays (HUDs) are gaining popularity as devices that effectively deliver vehicle driving information and surrounding situation information to the driver to ensure driving safety.

[0010]

[0011] A vehicle's head-up display is a display device that provides driving information or other data in front of the driver—that is, within the driver's primary line of sight—while the vehicle is in motion. Originally developed for use in aircraft, particularly fighter jets, it has recently begun to be installed in vehicles as well.

[0012]

[0013] Normally, when driving at about 100 km / h, there is a risk because the time it takes to shift one's gaze from the cluster to the road ahead is about 2 seconds, or about 55 meters. The vehicle head-up display was developed as one method to reduce this risk. The head-up display projects cluster information (speed, mileage, RPM, navigation information, etc.) onto the windshield along the driver's line of sight, allowing the driver to easily grasp driving information while driving.

[0014]

[0015] This enables the driver 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 as described above, most are installed by embedding them when the vehicle is manufactured by the vehicle manufacturer. Therefore, conventional vehicles without a HUD are configured to allow driving information to be perceived by installing a separate HUD device on the upper part of the dashboard and projecting an image onto the windshield.

[0018]

[0019] In this case, since the driving information projected from the HUD is provided as a two-dimensional image, it cannot be clearly projected onto the windshield, and there are limitations on the brightness, amount, and complexity of the projected image, so the driver cannot accurately identify the driving information projected from the HUD, which causes confusion.

[0020]

[0021] The objective of the present invention, which aims to solve the aforementioned problems, is to provide a variable image distance holographic head-up display system using a HOE screen that is detachable from a golf cart or commercial vehicle, allowing for easy installation and adjustment of the HUD to suit the vehicle environment, and which enhances the driver's visual efficiency and speeds up the response speed based on the provided information by projecting necessary information to the driver three-dimensionally using the diffraction of holographic optical elements.

[0022]

[0023] In addition, another objective of the present invention is to provide a variable image distance holographic head-up display system using a HOE screen that reduces driver fatigue and allows information to be clearly recognized by varying the depth of field according to the driver's situation or preference when driving information and driving environment information are displayed in three dimensions.

[0024]

[0025] In addition, another objective of the present invention is to provide a holographic head-up display system with variable imaging distance using a HOE screen that can efficiently use the system for driving the head-up display by miniaturizing the system while being able to output provided information on a large screen through an output area of ​​15 inches or more.

[0026]

[0027] A holographic head-up display system with variable image distance using a HOE screen according to the present invention for solving the above problem is characterized by comprising: a control unit that communicates with a commercial vehicle to generate driving information or driving environment information necessary for the commercial vehicle to drive; a first image generating unit formed on the interior ceiling of the commercial vehicle and receiving the driving information or the driving environment information to generate a first image; a second image generating unit formed on the upper part of the first image generating unit and receiving the driving information or the driving environment information to generate a second image; and a HOE lens formed on the windshield of the commercial vehicle to enable the first image and the second image to be displayed.

[0028]

[0029] In addition, the first image generating unit of the variable image distance holographic head-up display system using the HOE screen of the present invention is characterized by comprising: a housing having an open front and a hollow interior; an LCD light source module formed on the inner rear surface of the housing and configured to irradiate a laser light source that matches the recording wavelength of the HOE lens; an LCD panel formed on the front surface of the housing that controls a liquid crystal cell according to the provided driving information or driving environment information to generate a first image and then allows the laser light source irradiated from the LCD light source module to pass through; and a diffuser formed on the rear surface of the LCD panel that diffuses the light irradiated from the LCD light source module.

[0030]

[0031] In addition, the second image generating unit of the holographic head-up display system with variable image distance using the HOE screen of the present invention is characterized by further comprising: a HOE light source module formed to output the second image through laser projection; a HOE screen formed on the front of the HOE lens and projecting the second image onto the HOE lens by controlling the clarity of the second image through pixels composed of hogels when the second image is projected through a transparent display based on a holographic stereogram; and a moving module capable of adjusting the image distance of the second image projected onto the HOE lens by moving the HOE screen toward the windshield or the HOE light source module.

[0032]

[0033] In addition, the holographic head-up display system with variable image distance using the HOE screen of the present invention further includes a mounting member formed to mount and fix the first image generating unit and the second image generating unit to the vehicle and to adjust the image output position.

[0034]

[0035] In addition, the first image and the second image of the holographic head-up display system with variable image distance using the HOE screen of the present invention are formed to have different image distances from the HOE lens, and the second image is characterized by being able to adjust the difference in depth perception with the first image when the first image and the second image are played back on the HOE lens by varying the image distance.

[0036]

[0037] As described above, the holographic head-up display system with variable image distance using the HOE screen according to the present invention can be attached to and detached from golf carts or commercial vehicles, allowing the HUD to be easily installed and adjusted to suit the vehicle environment. Furthermore, by utilizing the diffraction of holographic optical elements to project information necessary for the driver in three dimensions, it has the effect of enhancing the driver's visual efficiency and speeding up the response speed based on the provided information.

[0038]

[0039] In addition, according to the holographic head-up display system with variable image distance using the HOE screen according to the present invention, when driving information and driving environment information are displayed three-dimensionally, the depth is varied to suit the driver's situation or preference, thereby reducing the driver's fatigue burden and enabling clear recognition of the information.

[0040]

[0041] In addition, according to the holographic head-up display system with variable imaging distance using a HOE screen according to the present invention, information can be displayed on a large screen through an output area of ​​15 inches or more, and the system for driving the head-up display can be miniaturized, thus providing the effect of being able to use it efficiently.

[0042]

[0043] FIG. 1 is a schematic diagram showing the overall configuration of a variable imaging distance holographic head-up display system using a HOE screen according to the present invention.

[0044] FIG. 2 is an example diagram of use of a variable imaging distance holographic head-up display system using a HOE screen according to the present invention.

[0045] FIG. 3 is a side view showing the installation of a variable imaging distance holographic head-up display system using a HOE screen according to the present invention.

[0046] FIG. 4 is a perspective view showing the mounting structure of a holographic head-up display system with variable imaging distance using a HOE screen according to the present invention.

[0047] FIG. 5 is a perspective view showing an image generation unit of a variable imaging distance holographic head-up display system using a HOE screen according to the present invention.

[0048] FIGS. 6 and 7 are exemplary diagrams showing how the depth of field of a variable imaging distance holographic head-up display system using a HOE screen according to the present invention is adjusted.

[0049] FIG. 8 is an optical configuration diagram for manufacturing a HOE lens of a variable imaging distance holographic head-up display system using a HOE screen according to the present invention.

[0050] FIG. 9 is an optical configuration diagram for manufacturing a HOE screen of a variable imaging distance holographic head-up display system using a HOE screen according to the present invention.

[0051]

[0052] C: Vehicle

[0053] W : Windshield

[0054] F : Frame

[0055] 10 : First video

[0056] 20 : 2nd video

[0057] 100 : First image generation unit

[0058] 110 : Housing

[0059] 111 : Frog hole

[0060] 120 : LCD light source module

[0061] 130 : LCD panel

[0062] 131 : Diffuser

[0063] 140 : HOE lens

[0064] 200 : Second image generation unit

[0065] 210 : HOE Light Source Module

[0066] 220 : HOE screen

[0067] 230 : Mobile Module

[0068] 300 : Control unit

[0069] 400 : Mounting part

[0070] 410 : Support

[0071] 420 : Stand

[0072]

[0073] The specific features and advantages of the present invention will be described in detail below with reference to the accompanying drawings. Prior to this, if it is determined that a detailed description of the functions and configurations related to the present invention may unnecessarily obscure the essence of the invention, such detailed description will be omitted.

[0074]

[0075] The present invention relates to a holographic head-up display system with a variable image distance using a HOE screen, and more specifically, to a holographic head-up display system with a variable image distance using a HOE screen that can display driving information and driving environment information three-dimensionally and adjust the sense of depth according to the driver's preference in commercial vehicles, such as golf carts, where a HUD system is not applied.

[0076]

[0077] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0078]

[0079] FIG. 1 is a configuration diagram showing the overall configuration of a variable image distance holographic head-up display system using a HOE screen according to the present invention, FIG. 2 is a diagram showing an example of use of a variable image distance holographic head-up display system using a HOE screen according to the present invention, FIG. 3 is a side view showing the installation of a variable image distance holographic head-up display system using a HOE screen according to the present invention, and FIG. 4 is a perspective view showing the structure of a mounting part (400) of a variable image distance holographic head-up display system using a HOE screen according to the present invention.

[0080]

[0081] As illustrated in FIGS. 1 to 4, the holographic head-up display system with variable image distance using a HOE screen according to the present invention is characterized by comprising: a control unit (300) that communicates with a commercial vehicle (C) to generate driving information or driving environment information necessary for the commercial vehicle (C) to drive; a first image generating unit (100) formed on the interior ceiling of the commercial vehicle (C) to receive driving information or driving environment information and generate a first image (10); a second image generating unit (200) formed on the upper part of the first image generating unit (100) to receive driving information or driving environment information and generate a second image (20); and a HOE lens (140) formed on the windshield (W) of the commercial vehicle (C) to enable the first image (10) and the second image (20) to be displayed.

[0082]

[0083] In addition, it is characterized by further including a mounting unit (400) formed to mount and fix the first image generation unit (100) and the second image generation unit (200) on a vehicle (C) and to adjust the image output position.

[0084]

[0085] Additionally, the mounting unit (400) is formed to be coupled to a frame (F) formed on the ceiling of a commercial vehicle (C) to distribute the load, and is composed of a support (410) that is coupled to the support (410) and is U-shaped so that the front and rear lower parts of the first image generating unit (100) can be mounted, and the mounting unit (420) can slide along the support (410) so that the distance between the first image generating unit (100) and the HOE lens (140) can be adjusted to enlarge or reduce the output image.

[0086]

[0087] The control unit (300) communicates with the commercial vehicle (C) to generate driving information that displays data output from the instrument panel necessary for driving the vehicle (C) to the driver, and driving environment information including navigation, weather, current time, and the presence or absence of a speed camera necessary for driving the vehicle (C), and is used to provide to the first image generation unit (100) and the second image generation unit (200).

[0088]

[0089] The first image generation unit (100) is formed to be installed and used in a commercial vehicle (C) that does not have a HUD, such as a golf cart, and the first image generation unit (100) is installed on the ceiling of the commercial vehicle (C) so that the first image (10) can be output to the windshield (W).

[0090]

[0091] At this time, a second image generation unit (200) is formed on the upper part of the first image generation unit (100), and the second image generation unit (200) is used to provide information different from the first image (10) output from the first image generation unit (100).

[0092]

[0093] Both the first image (10) and the second image (20) can be output including driving information or driving environment information, and the output images can be output at different locations without overlapping each other, or, if necessary, the two images can be superimposed to output an image that is emphasized three-dimensionally.

[0094]

[0095] In addition, the images output from the first image generation unit (100) and the second image generation unit (200) are projected onto a HOE (Holographic optical element) lens formed on the windshield (W), and since the size of the output image varies according to the projection distance, the driver can adjust the image size to match the desired HUD size or driving information or vehicle (C) information to be output.

[0096]

[0097] The HOE lens (140) is a lens made of a holographic optical element and can perform the operation of changing the light path of a specific wavelength, so that the first image (10) projected through the first image generating unit (100) can be reproduced in three dimensions.

[0098]

[0099] In the case of the second image generation unit (200), the second image (20) is formed to be displayed on the HOE lens (140) through an independently formed HOE screen (220) that does not match the wavelength formed on the HOE lens (140), and the detailed principle thereof will be described later.

[0100]

[0101] The mounting unit (400) is used to position the first image generating unit (100) and the second image generating unit (200) on the interior ceiling of a commercial vehicle (C) so that the angle and distance can be adjusted to display the first image (10) and the second image (20) through the HOE lens (140) formed on the windshield (W).

[0102]

[0103] The mounting unit (400) is used to mount the HOE lens (140) inside the vehicle (C) and consists of a plurality of supports (410) formed to distribute the load by being coupled to a frame (F) formed in the commercial vehicle (C), and a mounting bracket (420) that is coupled to the front and rear lower parts of the first image generating unit (100) and fixed to the supports (410).

[0104]

[0105] At this time, a second image generating unit (200) is formed on the upper part of the housing (110) of the first image generating unit (100), so that only the first image generating unit (100) is fixed, but the second image generating unit (200) may be configured to be separately fixed by a mounting unit (400) so that it can be independently variable.

[0106]

[0107] The frame (F) refers to a skeleton formed in a rectangular shape to form the ceiling of a commercial vehicle (C), and the support (410) allows two profiles or rails to be attached to the frame (F) in a spaced-apart state to match the width of the first image generating unit (100).

[0108]

[0109] In addition, the mounting bracket (420) coupled to the support (410) is formed in a U-shape, so that the upper end is coupled between the support (410) and fixed by a bracket, and the lower end contacts and is mounted on the lower surface of the first image generating unit (100) so that the first image generating unit (100) can be fixed to the support (410).

[0110]

[0111] At this time, it is preferable that the mounting bracket (420) be formed in two or more such that the front and rear of the first image generating unit (100) can be mounted and fixed respectively, and the inner surface of the mounting bracket (420) is provided with a plurality of holes for coupling with the first image generating unit (100) so that it can be coupled with the first image generating unit (100) by means of a bolt.

[0112]

[0113] In addition, it is preferable that the hole formed on the inner side of the mounting bracket (420) be in the form of a slot so that when the first image generating unit (100) is coupled by a bolt, the angle at which the image output from the first image generating unit (100) is projected can be adjusted.

[0114]

[0115] In addition, to adjust the distance between the first image generating unit (100) and the HOE lens (140), the support (410) may have a rail formed thereon, and a block that slides while being constrained to the support (410) may be formed on the upper part of the mounting bracket (420), thereby allowing the distance of the first image generating unit (100) coupled to the mounting bracket (420) to be freely adjusted.

[0116]

[0117] In this case, the mounting bracket (420) is formed to be fixed by being coupled to the support (410) by a bracket, and when the bracket is separated, the block slides along the rail, allowing the position of the first image generating unit (100) to be freely adjusted.

[0118]

[0119] If necessary, after applying a motor and a ball screw, the first image generating unit (100) and the second image generating unit (200) can automatically adjust the distance by moving in the direction of the windshield (W) of the commercial vehicle (C) or in the opposite direction by the control unit (300), and the irradiation angle of the first image generating unit (100) and the second image generating unit (200) may also be configured to automatically adjust.

[0120]

[0121] In addition, the distance and illumination angle of the first image generation unit (100) and the second image generation unit (200) can be stored in memory, and the stored position can be automatically output according to the driver to adjust the position of the first image generation unit (100) and the second image generation unit (200) to suit the driver.

[0122]

[0123] The first image generation unit (100) and the second image generation unit (200) are formed on the windshield (W) of a commercial vehicle (C) and are used to convert an image output from a HOE lens (140) into a holographic image so that the driver can view it as an image with three-dimensional depth.

[0124]

[0125] Since the HOE lens (140) can provide three-dimensional information through diffraction using a holographic optical element, clarity is improved and high brightness can be produced, and depending on the recording method, the size of the screen on which the HUD is output can be increased.

[0126]

[0127] FIG. 5 is a perspective view showing an image generation unit of a variable image distance holographic head-up display system using a HOE screen according to the present invention, and FIG. 6 and FIG. 7 are exemplary diagrams showing how the depth of field of a variable image distance holographic head-up display system using a HOE screen according to the present invention is adjusted.

[0128]

[0129] As illustrated in FIGS. 5 and 6, the first image generating unit (100) of the image distance variable holographic head-up display system using the HOE screen according to the present invention is characterized by comprising: a housing (110) having an open front and an empty interior; an LCD light source module (120) formed on the inner rear side of the housing (110) and formed to irradiate a laser light source that matches the recording wavelength of the HOE lens (140); an LCD panel (130) formed on the front side of the housing (110) that controls a liquid crystal cell according to provided driving information or driving environment information to generate a first image (10) and then allows the laser light source irradiated from the LCD light source module (120) to pass through; and a diffuser (131) formed on the rear side of the LCD panel (130) and diffusing the light irradiated from the LCD light source module (120).

[0130]

[0131] Additionally, the second image generation unit (200) further comprises a HOE light source module (210) formed to output the second image (20) through laser projection, a HOE screen (220) formed on the front of the HOE lens (140) and projecting the second image (20) onto the HOE lens (140) by controlling the clarity of the second image (20) through pixels composed of hogels when the second image (20) is projected through a transparent display based on a holographic stereogram, and a moving module (230) capable of adjusting the image distance of the second image (20) projected onto the HOE lens (140) by moving the HOE screen (220) toward the windshield (W) or the HOE light source module (210).

[0132]

[0133] In addition, the first image (10) and the second image (20) are formed to have different image distances at the HOE lens (140), and the second image (20) is characterized by varying the image distance so that the difference in depth perception with the first image (10) can be adjusted when the first image (10) and the second image (20) are reproduced at the HOE lens (140).

[0134]

[0135] The housing (110) is formed so that an LCD light source module (120), an LCD panel (130), and a diffuser (131) used in the first image generation unit (100) can be mounted inside, and is used to prevent each component from being damaged by external impact.

[0136]

[0137] In Fig. 5, the upper rear portion of the housing (110) is open, but this is merely to show the open appearance to explain the internal structure, and in reality, the upper portion is covered.

[0138]

[0139] At this time, the front of the housing (110) is open and formed in the shape of a box with an empty interior, and an LCD panel (130) and a diffuser (131) are sequentially connected to the open front, and an LCD light source module (120) is formed to be mounted on the rear interior.

[0140]

[0141] 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 (130) and LCD light source module (120) formed inside the housing (110) can be inserted, and a separate receiving box is provided on the lower front so that a control unit (300) can be stored.

[0142]

[0143] The LCD light source module (120) is formed on the inner rear side of the housing (110) and serves as a backlight to illuminate the screen of the LCD panel (130). It can also increase the clarity of the first image (10) by using a laser light source with a narrow bandwidth to match the recording wavelength of the HOE lens (140) so that it can be reproduced by the HOE lens (140).

[0144]

[0145] If the laser bandwidth of the LCD light source module (120) is too wide, the clarity of the first image (10) may be reduced, causing problems in information recognition. To solve this, the laser light source is designed to be close to the recording wavelength of the HOE lens (140) and has a narrow bandwidth, so that a high-resolution holographic image can be reproduced on the HOE lens (140).

[0146]

[0147] The laser irradiated from the LCD light source module (120) is diffused through the diffuser (131) formed on the front of the housing (110) and passes through the LCD panel (130). The LCD panel (130) electrically controls the liquid crystal cells to adjust the pixels so that the laser is transmitted only to the image of the driving information or driving environment information provided by the control unit (300), thereby enabling the HOE lens (140) to reproduce a clear image.

[0148]

[0149] In addition, since the high-brightness bright light can be controlled by the LCD light source module (120) used as a backlight for the LCD panel (130), the brightness of the holographic image output from the HOE lens (140) can be maintained.

[0150]

[0151] In the present invention, while using an LCD panel (130), the diffuser (131) is formed on the rear side of the LCD panel rather than at the end where the light source is transmitted, so the clarity can be improved.

[0152]

[0153] The diffuser (131) is used to diffuse the light of the laser emitted from the LCD light source module (120) so that it spreads evenly to the back of the LCD panel (130), and the function and principle of the diffuser (131) are already known technology, so they will be omitted.

[0154]

[0155] The control unit (300) is formed inside the housing (110) and is configured to receive driving information and driving environment information by communicating with a commercial vehicle (C), and based on this, it is possible to control the generation of different images in the first image generation unit (100) and the second image generation unit (200), respectively.

[0156]

[0157] At this time, the control unit (300) has a terminal exposed outside the housing so that it can communicate with the commercial vehicle (C) through a cable or communicate wirelessly with the commercial vehicle (C) using Bluetooth or Wi-Fi.

[0158]

[0159] The second image generation unit (200) is formed to output a second image (20) using laser projection and is formed to output the second image (20) from the upper part of the first image generation unit (100).

[0160]

[0161] The HOE light source module (210) is formed as a laser projector and uses a laser light source with a narrow bandwidth to match the recording wavelength of the HOE screen (220), and is formed to project a second image (20) of driving information or driving environment information onto the HOE screen (220) through the control unit (300).

[0162]

[0163] The HOE screen (220) is a transparent display technology based on a holographic stereogram, characterized by the ability to produce a clear image, high brightness, and various colors. It finely controls the light of the second image (20) projected from the HOE light source module (210) through the transparent HOE screen (220) and can generate a clear image through pixels composed of small hogels.

[0164]

[0165] At this time, the HOE screen (220) is positioned in front of the HOE lens (140) and the HOE screen (220) is formed transparently. Since the recording wavelength is different from that of the LCD light source module (120) formed in the first image generating unit (100), the first image (10) passes through the HOE screen (220) as is and can be reproduced on the HOE lens (140).

[0166]

[0167] Since the laser irradiated from the HOE light source module (210) has a recording wavelength that matches the HOE screen (220), a holographic image can be output by the HOE screen (220), and a second image (20) can be displayed on the windshield (W) on which the HOE lens (140) is formed.

[0168]

[0169] As a result, the first image (10) output from the first image generating unit (100) and the second image (20) output from the second image generating unit (200) can be output together at the HOE lens (140), and the first image (10) can be played through the HOE lens (140), and the second image (20) can be played through the HOE screen (220).

[0170]

[0171] Since the first image (10) and the second image (20) have different image distances, the image depth of the images formed by the HOE lens (140) can be perceived differently.

[0172]

[0173] That is, as shown in FIG. 6, the first image (10) output from the first image generating unit (100) and the second image (20) output from the second image generating unit both pass through the HOE screen (220) and are displayed on the HOE lens (140). At this time, the imaging distance of the first image (10) is 970 mm, and the imaging distance of the second image (20) is 650 mm.

[0174]

[0175] Through this, since the image distance at which the first image (10) and the second image (20) are played is different from each other, the depth of the two images can be perceived differently, so the driver can perceive the depth more intuitively according to the importance of the images output in the first image (10) and the second image (20).

[0176]

[0177] That is, the first image (10) located at a distance from the driver can display information guiding the way so that the direction of guidance is displayed as if it were on an actual road, and the second image (20) located close can be used to guide the driver to check important information necessary for driving, such as speed enforcement or traffic signal enforcement, up close.

[0178]

[0179] In addition, by allowing the driver to select the information output from the first image (10) and the second image (20) according to their preference, the driver can be guided to position the information they prefer more at the front due to the sense of depth.

[0180]

[0181] Additionally, the second image generation unit (200) is formed with a moving module (230) that moves the HOE screen (220) toward the windshield (W) or the HOE light source module (210), and the moving module (230) is operated by the control unit (300) so that the driver can directly adjust the image distance at which the second image (20) is displayed.

[0182]

[0183] The moving module (230) adjusts the imaging distance of the second image (20) so that the depth of the second image (20) becomes similar to that of the first image (10), or adjusts it so that the depth of the second image (20) differs more from that of the first image (10), thereby allowing the driver to view the second image (20) at various depths while driving.

[0184]

[0185] Therefore, through the moving module (230), the driver can select the depth of the second image (20) according to the driving situation, and since the HOE screen (220) is automatically moved through the control unit (300), the driver can change the position of the HOE screen (220) through a switch formed around the steering wheel or gear shifter while concentrating on driving.

[0186]

[0187] As a result, as shown in FIG. 7, the driver can adjust the position where the second image (20) is formed to 450 mm by moving the HOE screen (220) closer toward the windshield (W), and the first image (10) is formed at 970 mm, thereby allowing for a different sense of depth.

[0188]

[0189] FIG. 8 is an optical configuration diagram for manufacturing a HOE lens (140) of a variable imaging distance holographic head-up display system using a HOE screen according to the present invention.

[0190]

[0191] As illustrated in FIG. 8, the process of manufacturing the HOE lens (140) of a holographic head-up display system with variable imaging distance using an HOE screen according to the present invention is described as follows.

[0192]

[0193] M is a mirror, SF is a spatial filter, and BS is a beam splitter.

[0194] Three laser beams, R, G, and B, are combined into one beam through multiple mirrors and then divided into two beams (reference beam and signal beam) as they pass through a beam splitter (BS).

[0195]

[0196] A single laser light source is split into two beams (signal beam and reference beam) and incident on a HOE recording medium in the form of spherical waves in a specific direction.

[0197]

[0198] The angle of incidence and distance of the reference beam for the holographic recording medium are matched to the angle and distance traveled by the light from the first image generating unit (100) incident on the HOE lens (140).

[0199]

[0200] In addition, the incident angle and distance of the signal beam to the holographic recording medium are matched to the main viewing angle and projection distance of the head-up display image observed through the HOE lens (140), respectively.

[0201]

[0202] If the performance design for the HOE lens (140) is changed, the optical structure of FIG. 8 can be modified to produce a HOE that meets the design.

[0203]

[0204] FIG. 9 is an optical configuration diagram for manufacturing a HOE screen (220) of a holographic head-up display system with variable image distance using a HOE screen according to the present invention.

[0205]

[0206] As illustrated in FIG. 9, the process of manufacturing the HOE screen (220) of a holographic head-up display system with variable image distance using the HOE screen according to the present invention is described as follows.

[0207]

[0208] M is a mirror, SF is a spatial filter, and BS is a beam splitter.

[0209]

[0210] Three laser beams, R, G, and B, are combined into one beam through multiple mirrors and then divided into two beams (reference beam and signal beam) as they pass through a beam splitter (BS).

[0211]

[0212] A single laser light source is split into two beams (object beam and reference beam) and converted into a 250 µm size hogel and incident on the HOE recording medium in a specific direction.

[0213]

[0214] The angle of incidence and distance of the reference beam for the holographic recording medium are matched to the angle and distance at which the light from the HOE light source module (210) is incident on the HOE screen (220).

[0215]

[0216] If the performance design for the HOE screen (220) is changed, the optical structure of FIG. 9 can be modified to produce a HOE screen (220) that meets the design.

[0217]

[0218] As described above, according to the holographic head-up display system with variable image distance using the HOE screen according to the present invention, the HUD can be easily installed and adjusted for use in a vehicle environment by being detachable from a golf cart or commercial vehicle. Furthermore, by utilizing the diffraction of a holographic optical element to project information necessary for the driver in three dimensions, the driver's visual efficiency can be enhanced and the response speed based on the provided information can be increased. Additionally, when driving information and driving environment information are displayed in three dimensions, the driver's fatigue burden can be reduced and information can be clearly recognized by varying the depth of field according to the driver's situation or preference. Moreover, the provided information can be displayed on a large screen through an output area of ​​15 inches or more, and the system for driving the head-up display can be miniaturized, thereby providing the effect of efficient use.

[0219]

[0220] As described above, although the present invention has been explained with reference to preferred embodiments, those skilled in the art may implement the present invention with various modifications or variations without departing from the technical spirit and scope described in the claims of the present invention. Accordingly, the scope of the present invention should be interpreted by the claims described to include such many variations.

Claims

1. A control unit that communicates with a commercial vehicle to generate driving information or driving environment information necessary for the commercial vehicle to drive; A first image generation unit formed on the interior ceiling of the commercial vehicle and generating a first image by receiving the driving information or the driving environment information; A second image generation unit formed on the upper part of the first image generation unit and generating a second image by receiving the driving information or the driving environment information; Characterized by including a HOE lens formed on the windshield of the commercial vehicle and capable of displaying the first image and the second image. A holographic head-up display system with variable imaging distance using a HOE screen.

2. In Paragraph 1, The above first image generation unit A housing with an open front and a hollow interior; An LCD light source module formed on the inner rear surface of the above housing and configured to irradiate a laser light source that matches the recording wavelength of the HOE lens; An LCD panel formed on the front of the above housing and configured to control a liquid crystal cell according to the provided driving information or driving environment information to generate a first image, and then allow a laser light source irradiated from the LCD light source module to pass through; Characterized by comprising a diffuser formed on the rear surface of the LCD panel and diffusing light emitted from the LCD light source module. A holographic head-up display system with variable imaging distance using a HOE screen.

3. In Paragraph 1, The above second image generation unit A HOE light source module formed to output the above second image through laser projection; A HOE screen formed on the front surface of the HOE lens and, when the second image is projected through a transparent display based on a holographic stereogram, controls the clarity of the second image through pixels composed of hogels and projects it onto the HOE lens; The method further comprises a moving module capable of moving the HOE screen toward the windshield or the HOE light source module to adjust the imaging distance of the second image projected onto the HOE lens. A holographic head-up display system with variable imaging distance using a HOE screen.

4. In Paragraph 1, The invention is further characterized by including a mounting part formed to mount and fix the first image generating part and the second image generating part to the vehicle and to adjust the image output position. A holographic head-up display system with variable imaging distance using a HOE screen.

5. In Paragraph 1, The first image and the second image are formed to have different imaging distances at the HOE lens, and The second image is characterized by being able to adjust the difference in depth perception with the first image when the first image and the second image are reproduced on the HOE lens by varying the imaging distance. A holographic head-up display system with variable imaging distance using a HOE screen.

Images