CN115202057A

CN115202057A - HUD zoom system

Info

Publication number: CN115202057A
Application number: CN202210913718.4A
Authority: CN
Inventors: 王琅; 王波; 党小琳; 陈晓伟; 韩继军
Original assignee: Foryou Multimedia Electronics Co Ltd
Current assignee: Foryou Multimedia Electronics Co Ltd
Priority date: 2022-08-01
Filing date: 2022-08-01
Publication date: 2022-10-18

Abstract

The invention relates to a HUD zoom system, which comprises a windshield arranged in front of the viewing position of eyes of a driver, an imaging system and an imaging display area, wherein the imaging system comprises an imaging unit, a polarization spectroscope and a curved surface zoom unit, the polarization spectroscope is arranged between the imaging unit and the curved surface zoom unit, light rays are emitted from the imaging unit, pass through the polarization spectroscope, penetrate through the polarization spectroscope in a polarization state and enter the curved surface zoom unit, the polarization state is changed into S light after the reflection of the curved surface zoom unit, the light rays enter the windshield for reflection after the reflection of the polarization spectroscope, an amplified image is displayed in the imaging display area when the viewing position of the eyes of the driver is seen, the curved surface zoom unit is connected with a driving piece, and the driving piece drives and changes the position of the curved surface zoom unit in the light path so that the imaging distance is adjustable. The HUD zoom system has the advantages of compact light path, small volume, adjustable imaging distance and the like.

Description

HUD zoom system

Technical Field

The invention relates to the technical field of head-up displays, in particular to a HUD zoom system.

Background

The heads Up Display HUD (Head Up Display) was first used on military aircraft. In the last 80 s of century, HUDs began to be applied to automobiles. The head-up display can enable a driver to transfer sight to an instrument panel or a central control without lowering head in the driving process, and important driving information is directly acquired through a windshield. HUD can be to the present speed per hour, on information projection such as navigation to windshield, avoided the driver to look over the field of vision blind area that the panel board caused by bowing to improve the security and the convenience of driving.

In the existing light path of the automobile head-up display, most of the HUD display modes which are put into use are single-light-path display, and the imaging distance is generally fixed and unchanged. The projection distance cannot be changed well according to the requirements of a driver, and the experience feeling is poor. The current display modes include: a WHUD with an imaging distance of around 2.5m and a virtual image plane size of around 10 inches. Another is ARHUD with an imaging distance of about 55 inches in size for a virtual image plane of about 8 m. More someone, compromise low-speed driving and the operating mode of going at a high speed, have the design of two kinds of imaging distance, can show the information under the different imaging distance alone or two image planes simultaneous display. Typically, the near view displays regular vehicle speed information and the far view displays enhanced navigation information.

However, the driving environment is relatively complicated, the driver often needs to observe positions at different distances, and when the observation position of the eyes of the driver is different from the position of the projected image displayed on the screen, the driver cannot easily observe a clear projected image while observing the environment. If the vehicle is in a turning and doubling state and other road conditions needing prompting, conventional vehicle speed and alarm information can be integrated. The display will mark information such as direction with arrow on the road ahead, but the problem is that the actual display effect is like animation flying effect, the enhanced display sense is not good enough, and the visual fatigue is easy to cause.

Disclosure of Invention

The invention provides a HUD zoom system which has compact optical path and small volume and can realize adjustable imaging distance.

In order to achieve the above purpose, the following technical solutions are provided.

The utility model provides a HUD zoom system, is including the windshield that is located the place ahead setting of driver 'S eyes viewing position, imaging system and formation of image display area, imaging system includes imaging element, polarization spectroscope and curved surface unit of zooming, polarization spectroscope is located between imaging element and the curved surface unit of zooming, light sends from imaging element, through polarization spectroscope, polarization state P light sees through polarization spectroscope, gets into curved surface unit of zooming, and curved surface unit of zooming reflects the back, and the polarization state becomes S light, and light gets into the windshield reflection through polarization spectroscope reflection back again, sees at driver' S eyes viewing position department and shows an enlarged image in formation of image display area, curved surface unit of zooming is connected with the driving piece, the driving piece drive changes the position of curved surface unit of zooming in the light path, makes the formation of image distance far and near adjustable.

In the technical scheme, the imaging system mainly comprises an imaging unit, a polarization beam splitter and a curved surface zooming unit, wherein the imaging unit is used as an image source and used for emitting light; the light emitted by the imaging unit is subjected to polarization splitting by the polarization beam splitter and enters the curved surface zooming unit, after passing through the curved surface zooming unit, the curved surface zooming unit reflects the light, the light enters the polarization beam splitter again, and after being subjected to light splitting reflection by the polarization beam splitter, the light enters the windshield for imaging; wherein the curved surface zooms the unit and is connected with the driving piece, and the driving piece is used for driving the curved surface zooms the unit and carries out displacement adjustment in the light path, realizes classical face and zooms, makes the distance of the image that shows at the formation of image display area adjustable, and then realizes that HUD can be according to actual scene demand, and different scene show different content, and different information display realizes the content that shows under the variable circumstances of fixed distance or distance developments under the formation of image distance of difference, increases the security and the experience of driving and feels. According to the HUD zoom system, the polarization spectroscope and the free zoom unit are arranged in the imaging system, the PBS polarization spectroscope is utilized, the refraction and reflection type optical system is adopted, light rays are transmitted back and forth among optical elements, the imaging distance of the system can be longer under the condition of the same size of space, and the adjusting range is larger.

Furthermore, the curved surface zoom unit is a free-form surface zoom unit and comprises a free-form surface reflector, and a wave plate is arranged on one side of the free-form surface reflector, which is located on the polarization beam splitter.

In the above technical solution, the curved surface zoom unit is a free-form surface zoom unit, which can be set according to actual scenes and working condition requirements, specifically, a free-form surface reflector is used as a typical surface zoom body, a curved opening direction of the free-form surface reflector is located at one side facing the polarization beam splitter, and a wave plate is arranged at the opening side and is formed by processing a birefringent material, and the arrangement of the wave plate enables two mutually orthogonal polarization components to generate phase shift, so as to adjust the polarization state of the light beam.

Furthermore, the wave plate is made of a thin film material and is evaporated on the reflecting surface of the free-form surface reflector through a coating process.

In the technical scheme, the wave plate is evaporated on the free-form surface reflector by adopting a film coating process, and the combination of the wave plate and the free-form surface reflector is stable, so that the light path is more compact. And the wavelength band is wide, the display color range is wider, and the brightness is higher.

Furthermore, the free-form surface reflector is connected with the driving part, and the driving part drives the free-form surface reflector to axially shift along the propagation direction parallel to the light rays.

Among the above-mentioned technical scheme, driving piece drive free-form surface speculum carries out axial displacement along the direction of propagation that is on a parallel with light, also is that driving piece drive free-form surface speculum carries out linear displacement, and the driving piece adopts marching type drive, makes free-form surface speculum removal process stable, ensures that the formation of image shows clearly, and then promotes driver's impression and experience.

Further, when the free-form surface reflector is located at a first optical path position, a second optical path position or a third optical path position in the optical path, the imaging display area displays an amplified image at a first imaging position, a second imaging position or a third imaging position, and the first imaging position, the second imaging position and the third imaging position correspond to the first optical path position, the second optical path position and the third optical path position respectively.

In the above technical solution, the first imaging position is a farthest imaging position, the third imaging position is a closest imaging position, and the second imaging position is an intermediate imaging position, when the driving member drives the free-form surface mirror to be respectively located at the first optical path position, the second optical path position and the third optical path position in the optical path, the light is reflected by the free-form surface zooming unit, and then enters the polarization beam splitter for light splitting reflection again, and enters the windshield to image at the farthest imaging position, i.e., the first imaging position, of the imaging area, the intermediate imaging position, i.e., the second imaging position, and the closest imaging position, i.e., the third imaging position.

Further, the light rays are emitted from the imaging unit, the light rays are in a polarization state P and enter the wave plate after passing through the polarization beam splitter, the wave plate is a 1/4 wave plate and enters the free-form surface reflector after passing through the 1/4 wave plate, after the reflection of the free-form surface reflector, the light rays are in a polarization state which is changed into S light after passing through the 1/4 wave plate again, the light rays which are changed into the S light enter the windshield, and an amplified image is displayed in the imaging display area after being reflected by the windshield.

According to the technical scheme, after light passes through the polarization beam splitter, P light in a polarization state enters the 1/4 wave plate, the light is reflected by the free-form surface reflector and the 1/4 wave plate, the polarization state of the light is changed into S light, the S light in the polarization state enters the windshield after the light is split and reflected by the polarization beam splitter, the mode that the polarization beam splitter is adopted and the wave plate is arranged on the free-form surface reflector is adopted, the vibration state change of the light is achieved, meanwhile, the light enters the windshield after the light is split and reflected for multiple times, the light path structure is compact, the size of the whole system is small, the occupied space is small, and meanwhile, the adjustment of the imaging distance can be achieved.

Further, the imaging unit is any one of DLP, LOCS, LCD or laser scanning LBS projection modules.

Among the above-mentioned technical scheme, DLP, LOCS, LCD or laser scanning LBS class projection module are common projection module, and its projection technology is mature, make this technical scheme projection formation of image more stable and clear, and then ensure driver's impression and experience.

Further, the imaging unit is polarized by the polarization device, so that the polarized light passing through the imaging unit is in a P polarization state.

In the above technical scheme, when the light of the imaging unit is emitted, the polarization polarizing device is used for polarizing, so that the light emitted by the imaging unit is polarized in a polarization state P light and enters the polarization beam splitter, and after the polarization state P light enters the polarization beam splitter, the polarization beam splitter outputs the polarization state P light after vibration beam splitting, so that the polarization state P light enters the free-form surface zooming unit.

Further, the polarization polarizing device is a 1/2 wave plate.

In the above technical scheme, the polarization polarizing device is a 1/2 wave plate, i.e. a half-wave plate. The half-wave plate has the functions of reducing reflected light and increasing transmitted light, so that light sources entering the polarizing beam splitter are increased, and further, the imaging quality is guaranteed.

Further, the imaging display area ranges from 3m to 20m.

In the technical scheme, the imaging display area is a variable area and ranges from 3m to 20m, so that the system can display different contents in different scenes according to the requirements of actual scenes, different information is displayed in different imaging distances, the contents displayed in the condition of fixed distance or dynamically variable distance can be realized, and the driving safety is improved.

Compared with the prior art, the HUD zoom system has the following beneficial effects:

according to the HUD zoom system, the polarization spectroscope and the free zoom unit are arranged in the imaging system, the PBS polarization spectroscope is utilized, the refraction and reflection type optical system is adopted, light rays are transmitted back and forth among optical elements, the imaging distance of the system can be longer under the condition of the same size of space, and the adjusting range is larger.

Drawings

FIG. 1 is a schematic structural distribution diagram of a HUD zoom system 1 according to an embodiment of the present invention;

FIG. 2 is a schematic structural distribution diagram of the imaging system of FIG. 1;

FIG. 3 is a schematic diagram of a particular curved zoom unit of the imaging system of FIG. 1;

FIG. 4 is a detailed imaging path diagram of the imaging system of FIG. 1;

FIG. 5 is a flow chart of the polarization change of the HUD zoom system of the present invention;

FIG. 6 is a schematic structural distribution diagram of the HUD zoom system of embodiment 2 of the present invention;

FIG. 7 is a schematic structural distribution diagram of the imaging system of FIG. 6.

Detailed Description

The HUD zoom system of the present invention will be described in further detail with reference to the following embodiments and accompanying drawings.

Example 1

Referring to fig. 1 to 5, a non-limiting embodiment of the present invention is a HUD zoom system, which includes a windshield 3, an imaging system 2 and an imaging display area 1, where the imaging system 2 includes an imaging unit 21, a polarization beam splitter 22 and a curved zoom unit 23, the polarization beam splitter 22 is located between the imaging unit 21 and the curved zoom unit 23, in this embodiment, the imaging unit directly emits light to the polarization beam splitter, the light is emitted from the imaging unit 21, passes through the polarization beam splitter 22, the polarized light P passes through the polarization beam splitter 22 and enters the curved zoom unit 23, after reflection of the curved zoom unit 23, the polarization state is changed into S light, the light passes through the polarization beam splitter 22 and then enters the windshield 3 to be reflected, an enlarged image is displayed in the imaging display area 1 at the driver eye viewing position 4, the curved zoom unit 23 is connected to a driving element (not shown in the figure), and the driving element drives the curved zoom unit 23 to change the position in the light path, specifically, the curved zoom unit 23 is driven to move along the MM1 axis direction, so that the imaging distance is adjustable. In this embodiment, the driving element is a stepping driving element, and specifically, the driving element is preferably a structure in which a stepping motor drives a screw rod to move, and other stepping driving structures may also be adopted to ensure that the curved surface zoom unit 23 operates stably, thereby ensuring the imaging quality. In the technical scheme, the imaging system 2 mainly comprises an imaging unit 21, a polarization beam splitter 22 and a curved surface zooming unit 23, wherein the imaging unit 21 is used as an image source and used for emitting light; the light emitted by the imaging unit 21 is polarized and split by the polarizing beam splitter and enters the curved surface zooming unit 23, after passing through the curved surface zooming unit 23, the curved surface zooming unit 23 reflects the light, enters the polarizing beam splitter again, and enters the windshield 3 after being split and reflected by the polarizing beam splitter for imaging; wherein the curved surface zooms unit 23 and is connected with the driving piece, the driving piece is used for driving the curved surface zooms unit 23 to carry out displacement adjustment in the light path, realize the ceremony face and zoom, the distance that makes the image that shows at formation of image display area 1 is adjustable, and then realize that HUD can be according to actual scene demand, different scenes show different content, different information display is under the imaging distance of difference, realize the content that shows under fixed distance or the variable condition of distance developments, the security and the experience of increase driving are felt. According to the HUD zoom system, the PBS 22 and the catadioptric optical system are adopted by arranging the polarizing beam splitter 22 and the free zoom unit in the imaging system 2, light rays are transmitted back and forth among optical elements, and therefore the imaging distance of the system can be longer and the adjusting range is larger under the condition of the same size of space.

Referring to fig. 1 to 4, in a non-limiting embodiment of the present invention, the curved surface zoom unit 23 is a free-form surface zoom unit, and includes a free-form surface reflector, and a wave plate 24 is disposed on one side of the free-form surface reflector, which is located on the polarization beam splitter 22. In this embodiment, the wave plate 24 is a 1/4 wave plate, in the present technical solution, the curved surface zoom unit 23 is a free-form surface zoom unit, which can be set according to the actual scene and working condition requirements, specifically, a free-form surface reflector is used as a typical surface zoom main body, a curved opening direction of the free-form surface reflector is located at one side facing the polarization beam splitter 22, and a 1/4 wave plate is disposed at the opening side and is processed from a birefringent material, and the arrangement of the wave plate causes phase shift of two mutually orthogonal polarization components, which can be used to adjust the polarization state of the light beam.

Referring to fig. 1 to 4, in a non-limiting embodiment of the present invention, the wave plate 24 is made of a thin film material and is deposited on the reflective surface of the free-form surface mirror by a coating process. In the technical scheme, the wave plate 24 is evaporated on the free-form surface reflector by adopting a film coating process, the combination of the wave plate and the free-form surface reflector is stable, and the wavelength band is wide, so that the light path is more compact.

Referring to fig. 1 to 4, in a non-limiting embodiment of the present invention, the free-form surface reflector is connected to a driving member, and the driving member drives the free-form surface reflector to axially displace along a direction parallel to a propagation direction of the light. Among this technical scheme, driving piece drive free-form surface speculum carries out axial displacement along the direction of propagation that is on a parallel with light, also is that driving piece drive free-form surface speculum carries out linear displacement, and the driving piece adopts marching type drive, makes free-form surface speculum removal process stable, ensures that the formation of image shows clearly, and then promotes driver's impression and experiences.

Referring to fig. 1 to 4, in a non-limiting embodiment of the present invention, when the free-form surface reflecting mirror is located at a first optical path position S1, a second optical path position S2, or a third optical path position S3 in the optical path, the imaging display area 1 displays an enlarged image at a first imaging position 11, a second imaging position 12, or a third imaging position 13, where the first imaging position 11, the second imaging position 12, and the third imaging position 13 correspond to the first optical path position S1, the second optical path position S2, and the third optical path position S3, respectively. In the technical scheme, the first imaging position 11 is a farthest imaging position, the third imaging position 13 is a closest imaging position, and the second imaging position 12 is an intermediate imaging position, when the driving member drives the free-form surface reflecting mirror to be respectively located at the first optical path position S1, the second optical path position S2 and the third optical path position S3 in the optical path, light rays are reflected by the free-form surface zooming unit 23 and then enter the polarization beam splitter 22 for light splitting reflection again, and enter the windshield 3 to be imaged at the farthest imaging position, namely the first imaging position 11, of the imaging area, the intermediate imaging position, namely the second imaging position 12, and the closest imaging position, namely the third imaging position 13.

Referring to fig. 1 to 5, in a non-limiting embodiment of the present invention, the light beam is emitted from the imaging unit 21, and enters the wave plate in a polarization state P after passing through the polarization beam splitter 22, the wave plate is a 1/4 wave plate, and enters the free-form surface reflector after passing through the 1/4 wave plate, after the free-form surface reflector reflects the light beam, the polarization state of the light beam is changed into S light, the light beam changed into S light enters the windshield 3, and is reflected by the windshield 3, and an enlarged image is displayed in the imaging display area 1. In the technical scheme, after light passes through the polarization spectroscope 22, the light in a polarization state P enters the 1/4 wave plate, after the light is reflected by the free-form surface reflector and the 1/4 wave plate, the polarization state of the light is changed into S light, and after the light is subjected to light splitting reflection by the polarization spectroscope 22, the polarization state S light enters the windshield 3.

Referring to fig. 1 to 5, in a non-limiting embodiment of the present invention, the image forming unit 21 is any one of a DLP, a LOCS, an LCD or a laser scanning LBS projection module. In the technical scheme, DLP, LOCS, LCD or laser scanning LBS and other projection modules are common projection modules, the projection technology is mature, so that projection imaging of the technical scheme is more stable and clear, and the impression experience of a driver is further ensured.

Referring to fig. 1 to 5, in a non-limiting embodiment of the present invention, the imaging unit 21 is polarized by a polarization polarizer, so that the polarized light passing through the imaging unit 21 is in P polarization state. In the present technical solution, when the light of the imaging unit 21 is emitted, the polarization polarizing device is used for polarizing, so that the light emitted by the imaging unit 21 is a polarized light P and enters the polarizing beam splitter 22, and after the polarized light P enters the polarizing beam splitter 22, the polarizing beam splitter 22 vibrates and splits the polarized light P to output the polarized light P, so that the polarized light P enters the free-form surface zooming unit 23.

Referring to fig. 1 to 5, in a non-limiting embodiment of the present invention, the polarization device is a 1/2 wave plate. In the technical scheme, the polarization polarizing device is a 1/2 wave plate, namely a half-wave plate. The half-wave plate has the function of enabling the light polarization state of the imaging unit 21 to be linearly polarized light, and further guaranteeing the imaging quality.

Referring to fig. 1 to 5, according to a non-limiting embodiment of the present invention, the imaging display area 1 ranges from 3m to 20m. In the technical scheme, the imaging display area 1 is a variable area and ranges from 3m to 20m, so that the system can display different contents in different scenes according to the requirements of actual scenes, different information is displayed in different imaging distances, the contents displayed in the fixed distance or distance dynamic variable condition can be realized, and the driving safety is improved.

Example 2

Referring to fig. 6 and 7, a non-limiting embodiment of the present invention, which is basically the same as the structure and principle of embodiment 1, differs in that an optical path turn is added to the imaging unit. Specifically, in the present embodiment, a HUD zoom system is provided, including windshield 3A located in the front of driver's eye viewing position 4A, imaging system 2A and imaging display area 1A, imaging system 2A includes imaging unit, polarization beam splitter 22A and curved surface zoom unit 23A, polarization beam splitter 22A is located between imaging unit and curved surface zoom unit 23A, the imaging unit is composed of imaging source 20A and primary reflecting mirror 21A, primary reflecting mirror 21A is located between polarization beam splitter 22A and imaging source 20A, wherein curved surface zoom unit 23 is connected with the driving piece. In this embodiment, the primary reflecting mirror 21A is a plane reflecting mirror or a free-form surface mirror capable of correcting aberration, light is emitted from the imaging source 20A to the primary reflecting mirror 21A, and is reflected by the primary reflecting mirror 21A for the first time to the polarization beam splitter, and passes through the polarization beam splitter 22, and the polarized light P passes through the polarization beam splitter 22 and enters the curved surface zoom unit 23, and the curved surface zoom unit 23 performs the second reflection on the light, and the light after the second reflection passes through the polarization beam splitter 22 again, and the polarized light S is reflected by the polarization beam splitter 22 and enters the windshield 3 to be reflected, and an amplified image displayed in the imaging display area 1 is seen at the viewing position 4 of the driver' S eye, and the curved surface zoom unit 23 is connected to a driving element (not shown in the figure), and the driving element drives to change the position of the curved surface zoom unit 23 in the light path, so that the imaging distance is adjustable. This embodiment is through improving imaging element, increases the light path reflection once in imaging element, makes light path overall structure compacter, and the volume is littleer.

In the description of the present invention, it is to be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, which indicate orientations or positional relationships, are used based on the orientations or positional relationships shown in the drawings only for the convenience of describing the present invention and for the simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The above embodiments are only specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications are possible without departing from the inventive concept, and such obvious alternatives fall within the scope of the invention.

Claims

1. A HUD zoom system comprising a windshield positioned in front of a driver's eye-viewing position, characterized in that: still include imaging system and formation of image display area, imaging system includes imaging element, polarization spectroscope and curved surface unit of zooming, polarization spectroscope is located between imaging element and the curved surface unit of zooming, light is sent from imaging element, through polarization spectroscope, polarization state P light passes through polarization spectroscope, gets into curved surface unit of zooming, and curved surface unit of zooming reflects the back, and the polarization state becomes S light, and light gets into the windshield reflection after passing through polarization spectroscope reflection again, sees at driver' S eyes viewing position department and shows an enlarged image in the imaging display area, curved surface unit of zooming is connected with the driving piece, the position of driving piece drive change curved surface unit of zooming in the light path makes the imaging distance far and near adjustable.

2. The HUD zoom system of claim 1, wherein the curved zoom unit is a free-form zoom unit comprising a free-form mirror with a wave plate on one side of the polarizing beam splitter.

3. The HUD zoom system of claim 2, wherein the wave plate is made of a thin film material and is deposited on the reflective surface of the free-form surface reflector by a coating process.

4. The HUD zoom system of claim 2, wherein the free-form surface mirror is coupled to a drive member that drives the free-form surface mirror for axial displacement parallel to the direction of propagation of the light rays.

5. The HUD zoom system of claim 3, wherein the imaging display area displays a magnified image at a first imaging position, a second imaging position, or a third imaging position when the free-form surface mirror is at the first, second, or third optical path position in the optical path, the first, second, and third imaging positions corresponding to the first, second, and third optical path positions, respectively.

6. The HUD zoom system of any one of claims 2 to 5, wherein the light rays are emitted from the imaging unit, P light in a polarization state enters the wave plate after passing through the polarization beam splitter, and enters the free-form surface reflector after passing through the 1/4 wave plate, after the free-form surface reflector is reflected, the polarization state of the light rays is changed into S light after the light rays pass through the 1/4 wave plate again, the light rays changed into the S light enter the windshield, and are reflected by the windshield, so that an enlarged image is displayed in the imaging display area.

7. The HUD zoom system of claim 6, wherein the imaging unit is any one of DLP, LOCS, LCD or laser scanning LBS projection module.

8. The HUD zoom system of claim 7, wherein the imaging unit is polarized using a polarization polarizing device such that polarized light passing through the imaging unit is P-polarized.

9. The HUD zoom system of claim 8, wherein the polarization polarizing device is a 1/2 wave plate.

10. The HUD zoom system of claim 9, wherein the imaging display area ranges from 3m to 20m.