CN114063290A

CN114063290A - Head-up display system for vehicle

Info

Publication number: CN114063290A
Application number: CN202010787007.8A
Authority: CN
Inventors: 秦宗; 林世明; 林益民; 骆光祚
Original assignee: Dongguan Chuangyi Electronic Technology Co ltd
Current assignee: Dongguan Chuangyi Electronic Technology Co ltd
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2022-02-18

Abstract

The invention provides a vehicle head-up display system, which is an automobile head-up display system for generating two virtual images with different distances from a driver, wherein each virtual image uses all pixels of the same image source. Linearly polarized light emitted by an image source passes through a dynamic polarization converter to generate two image lights with mutually vertical polarization states and fast switching for time multiplexing; the two image lights are respectively transmitted and reflected by a polarization selective element, the reflected image light generates a relay image through an optical image transfer device, and a curved mirror is used for reflecting the two image lights to a virtual image reflecting surface and then enters the two eyes of a driver to form two virtual images with different distances.

Description

Head-up display system for vehicle

Technical Field

The invention relates to the field of head-up display, in particular to a vehicle head-up display system for generating virtual images with different virtual image distances.

Background

The improvement of head-up display (HUD) to safety of driving a vehicle has been confirmed in many studies and applications, and the head-up display is becoming a necessary configuration for a vehicle featuring safety. Conventional heads-up displays utilize an image source (e.g., a liquid crystal display or digital light processing) and a set of imaging optics (e.g., one or more mirrors or lenses) to project light from the image source onto an optical combiner or windshield of the vehicle to form an enlarged virtual image at a distance from the driver. However, as head-up displays have been developed, a single virtual image distance has become insufficient, and automobiles increasingly require head-up displays having at least two virtual image distances. Specifically, simple information such as speed and oil amount can be displayed in a virtual image at a close distance; information to be fused with the real world, such as navigation and maps, needs to be displayed in a remote virtual image. According to human factors research in the field of head-up displays, the near virtual image should be generally located 1.8m to 2.5m away from the driver, so that the driver has the best response speed in an emergency; the distant virtual image may be located outside 7m to blend in with the distance matching of the external road.

As described above, in the prior art, in order to generate two virtual images at different distances, two image sources are often used or one image source is divided into two regions, the former has complicated mechanism, high cost, reduced durability and reliability, and the latter has insufficient image resolution, image viewing angle and information amount, both of which need to be improved.

Disclosure of Invention

The invention provides a vehicle head-up display system, which utilizes a single image source to match with time multiplex control, and uses the single image source to generate two virtual images with different distances, wherein the different virtual images output image contents in sequence by all pixels of the image source, so that a driver can visually feel to see the two virtual images with different distances at the same time.

The invention provides a vehicle head-up display system, which utilizes the polarization conversion of light and selects a single image source matched with time multiplex control to generate a plurality of virtual images with different distances and non-overlapping visual fields or a plurality of virtual images with different distances and overlapping visual fields.

Drawings

Fig. 1 is a schematic side view of a first embodiment of an automotive head-up display system according to the present disclosure at a certain time point.

Fig. 2 is a schematic side view of the first embodiment of the automotive head-up display system at another time point.

Fig. 3 is a schematic side view of a first embodiment of the automotive heads-up display system according to the present disclosure, in which an image source controls continuous output of image light in a time sequence.

Fig. 4 is a schematic side view of a second embodiment of the automotive heads-up display system according to the present disclosure, in which an image source controls continuous output of image light in a time sequence.

Fig. 5 is a schematic side view of a vehicle head-up display system according to a third embodiment of the present invention, in which an image source controls the continuous output of image light in a time sequence.

Fig. 6 is a schematic side view of a vehicle head-up display system according to a fourth embodiment of the present disclosure, in which an image source controls the continuous output of image light in a time sequence.

Reference numerals:

1 vehicle body

2. WS wind shield

5. D driver

10 image source

11. 13 image light

12 light polarization converter

14 polarization selective member

16 image rotating assembly

21. VI1 first virtual image

23. VI2 second virtual image

31. 33, 35, 37 automobile head-up display system

41 transmissive exit surface

43 reflecting light emergent surface

61 first light path

62 first mirror

63 second light path

64 second reflector

66 third reflecting surface

CB optical superposer

HM half-penetration half-reflection mirror

L liquid crystal display

L ', LS' relay image

LS laser scanning display

M0 curved mirror

M1, M2 and M3 plane mirror

PB polarization beam splitter

PL linear polarizing plate

P1 first image light

P2 second image light

TN, TN1, TN2 twisted nematic liquid crystal cell

VID1 first virtual image distance

VID2 second virtual image distance

Detailed Description

The following detailed description of the embodiments of the invention is provided in connection with the accompanying drawings. Aside from the details given herein, this invention is capable of broad application to other embodiments and that various other substitutions, modifications, and equivalents may be made in the embodiments without departing from the scope of the invention as defined by the appended claims. In the description of the specification, numerous specific details are set forth in order to provide a more thorough understanding of the invention; however, the present invention may be practiced without some or all of these specific details. In other instances, well-known steps or elements have not been described in detail so as not to unnecessarily obscure the present invention. It is noted that the drawings are for illustrative purposes only and do not represent actual sizes or quantities of elements, and some details may not be drawn completely to simplify the drawings.

The following image source may be, for example but not limited to, a Liquid Crystal Display (LCD), an organic light emitting diode display (OLED), a Digital Light Processing (DLP), a liquid crystal on silicon (LCoS), a surface light source display such as a laser scanning display, and the like, and may emit image light in a linear polarization state or a circular polarization state of the image source, or may be attached to a linear polarizer on a light emitting surface of the image source to emit image light in a linear polarization state.

The light polarization converter of the present invention can control the temporary change of its state or structure in different ways, so as to generate the effect of converting or maintaining the image light with polarization state. For example, the Liquid Crystal arrangement of a Twisted Nematic Liquid Crystal (TN-LC) cell is voltage dependent, when no voltage is applied, the Twisted Nematic Liquid Crystal cell is in a first state, and the polarization state of image light having a polarization state is switched by 90 degrees after passing through the Twisted Nematic Liquid Crystal cell in the first state; when a voltage is applied, the twisted nematic liquid crystal cell is in the second state, and the polarization state of the image light having the polarization state is maintained after passing through the twisted nematic liquid crystal cell in the second state, but the present invention is not limited to the twisted nematic liquid crystal cell. Secondly, the temporary state or structure change or switching of the optical polarization converter needs to be fast, e.g. the switching frequency is higher than 30 Hz.

The polarization selective member of the present invention is referred to as a polarization selective member, which has the effect of selectively transmitting, reflecting or deflecting polarized light with different polarization states, such as making the transmittance of P-polarized light greater than 90%, and the reflectance of S-polarized light greater than 80%, or making different deflection angles for left-handed and right-handed polarized light, etc. By way of example, but not limitation, the polarization selective components include one or more Polarization Beam Splitters (PBSs), geometric phase (Pancharatnam-Berry) elements, or superlenses (metalens).

The present invention, hereinafter referred to as time-multiplexed control, controls the image source and the light polarization converter with a timing signal to have different outputs or representations at different times. However, in order to make the viewer not perceive the flicker, the present invention visually generates two images with different contents, or referred to as different pictures, so that the frequency of the timing signal is preferably over 30Hz, more preferably over 60 Hz.

The image transfer components of the present invention may include one or more of a flat mirror, a curved mirror, a reflective surface, a transflective mirror, and the like. In the case of a reflective or transmissive surface, the reflective or transmissive surface may be provided by a portion of the vehicle body or vehicle structure, for example the reflective or transmissive surface is part of the windshield of the vehicle. Furthermore, other optical elements may be used as part of the image transfer device, such as the twisted nematic liquid crystal cell described above.

Fig. 1 and 2 are schematic side views of a first embodiment of an automotive head-up display system according to the present disclosure. As shown in fig. 1 and 2, an automotive heads-up display system 31 includes an image source 10, a light polarization converter 12, a polarization selective member 14, and a relay assembly 16. The image source 10 with a predetermined number of pixels outputs at least one image light 11 with a first polarization state. The light polarization converter 12 is arranged on the light-emitting side of the image source 10 and receives the image light 11 in the first polarization state, and the image light 13 in the first polarization state or the second polarization state is formed and output by switching the states of the light polarization converter 12, wherein the first polarization state and the second polarization state are different. Next, the polarization selective member 14 is disposed on the light-emitting side of the light polarization converter 12 and receives the incident image light 13 to select the light path of the image light 13 from the first light-emitting surface or the second light-emitting surface, wherein the first light-emitting surface and the second light-emitting surface are different. It should be noted that, if the image light 13 is in the first polarization state, the image light 13 is selected by the polarization selective component 14 and then emitted from a first light emitting surface, for example, the transmission light emitting surface 41, and then travels along the first optical path 61, as shown in fig. 1; if the image light 13 is in the second polarization state, the image light 13 is reflected by the polarization selective member 14 and then travels along the second light path 63 after being emitted from the second light emitting surface, for example, the reflective light emitting surface 43, as shown in fig. 2. The first optical path 61 and the second optical path 63 are only used for difference, and the image light 13 in the second polarization state may also be along the first optical path 61 and the image light 13 in the first polarization state may also be along the second optical path 63, which is not limited to the above. Relay assembly 16 includes a plurality of optical components, such as a first mirror 62, a second mirror 64, and a third reflective surface 66, disposed on first optical path 61 or/and second optical path 63, some of which are shared by multiple optical paths, such as second mirror 64 and third reflective surface 66, and some of which are not, such as first mirror 62. Furthermore, the optical components of the relay assembly 16 may be disposed at appropriate locations within the vehicle body 1, or may be disposed on the windshield 2 or integrated with the windshield 2. The image light 13 in the first polarization state is imaged through the first light path 61 to generate a first virtual image 21, and the image light 13 in the second polarization state is imaged through the second light path 63 to generate a second virtual image 23, where the first virtual image 21 and the second virtual image 23 are also described in a relative manner. Wherein the first optical path distance is not equal to the second optical path distance, and for a driver 5, the distance between the first virtual image 21 and the driver 5 is different from the distance between the second virtual image 23 and the driver 5.

Fig. 3 is a schematic side view of an automotive head-up display system according to a first embodiment of the present disclosure, in which an image source controls image light output in a time sequence. Referring to fig. 1, 2 and 3, in this embodiment, the image source is a liquid crystal display (denoted by "L" in the figure) with a diagonal dimension of 1.8 inches, and emits image light with S-polarized light (first polarization state) with respect to the plane of the paper according to a set timing, wherein the image source emits first image light and second image light which are rapidly switched, and the switching frequency is 30Hz or higher. It should be noted that the first image light and the second image light have the same polarization state (S-polarized light), and the image content is output by all the pixels of the liquid crystal display, but the image content may be different, for example but not limited to, the first image light is instrument panel information, and the second image light is road information. Next, the light polarization converter on the light emitting side of the image source includes a Twisted Nematic Liquid Crystal (Twisted Nematic) cell TN, in which the state of the Twisted Nematic Liquid Crystal cell TN is switched by whether a voltage is applied or not. Under the condition of no voltage, the twisted nematic liquid crystal cell TN is in the first state and outputs the received image light 11 after the S-polarization state is converted into the P-polarization state, and under the condition of voltage, the twisted nematic liquid crystal cell TN is in the second state and outputs the received image light 11 after the S-polarization state maintains the S-polarization state. Therefore, if no voltage or voltage is applied to the light polarization converter at the same set time sequence as the image source, so that the light polarization converter switches the first state and the second state of the light polarization converter at the set time sequence substantially equal to the image source, the image light 13 outputted from the light polarization converter is the first image light in P polarization state and the second image light in S polarization state which are switched rapidly. Therefore, the image source 10 and the optical polarization converter 12(TN) can be controlled by the same controller to synchronously switch the switching time and the switching frequency, i.e. the optical polarization converter 12(TN) switches the first state and the second state synchronously corresponding to the first image light and the second image light outputted by the image source 10 by fast switching.

With continued reference to fig. 1, 2 and 3, in the first embodiment, the polarization selective device includes a polarization beam splitter PB disposed along the traveling direction of the image light 13 and receiving the incident image light 13, the first mirror is a planar mirror M1, the second mirror is a non-rotationally symmetric curved mirror M0, and the third reflecting surface is provided by a portion of the windshield WS. When no voltage is applied to the twisted nematic liquid crystal cell TN, the P-polarized first image light passes through the first light-emitting surface of the polarization beam splitter PB along the original optical path direction to form a first image light P1. The first image light P1 advances in the original optical path direction (first direction), enters the eyes of the driver D after sequentially passing through the non-rotationally symmetric curved mirror M0 and the reflection of the windshield WS, and forms a first virtual image VI1 in the line-of-sight direction of the driver D, where the first virtual image VI1 is at a first virtual image distance VID1 from the driver D. When a voltage is applied to the light polarization converter 12(TN), the S-polarization first image light is reflected when passing through the polarization selective member 14 along the original optical path direction, the second image light P2 emitted from the second light emitting surface of the polarization selective member 14(PB) advances along the optical path direction (second direction), passes through the plane mirror M1 (relay plane mirror) to form a relay image L ', and the relay image L' is reflected by the non-rotationally symmetric curved mirror M0 and the windshield WS (virtual image reflection surface) to enter the eyes of the driver D and form a second virtual image 2 along the line of sight of the driver D, where the second virtual image VI2 is a second virtual image distance VID2 with respect to the driver D. Furthermore, the curved mirror M0 (curved mirror) is the main element of the system providing imaging power, and generally has a non-rotationally symmetric surface shape to counteract the different aberrations in the horizontal and vertical directions. It will be appreciated that a single curved mirror may be converted to multiple curved mirrors to provide greater flexibility in aberration elimination, or that flat mirrors may be added as appropriate to adjust the position of the optical mechanism.

With continued reference to fig. 1, 2 and 3, the lcd L and the relay image L 'are both located in the focal point of the non-rotationally symmetric curved mirror M0, and the relay image L' is longer than the object distance of the lcd L due to the image transfer effect of the plane mirror M1 (the transfer plane mirror), and therefore, the second virtual image distance VID2 is longer than the first virtual image distance VID 1. Finally, the driver D can see the first virtual image VI1 and the second virtual image VI2 at the same time, and the first virtual image VI1 and the second virtual image VI2 are virtual images that both utilize all pixels of the liquid crystal display L, and have different distances from each other, so that the fields of view do not overlap.

Fig. 4 is a schematic side view of an automotive head-up display system according to a second embodiment of the present disclosure, in which an image source controls image light output in a time sequence. In the automotive heads-up display system 33, the image source includes a laser scanning display LS having a diagonal dimension of 3 inches and emitting natural light with no polarization, wherein the laser scanning display LS emits a first image light and a second image light which are rapidly switched at a switching frequency of 30Hz or higher. In this embodiment, the image source further includes a linear polarizer PL attached to the light emitting surface of the laser scanning display LS, wherein the polarizing direction of the linear polarizer PL is S relative to the plane of the paper. Therefore, the first image light and the second image light emitted by the image source in time sequence are both S-polarized image light 11. Next, the light polarization converter includes a twisted nematic liquid crystal cell TN1 similar to that described in the first embodiment, and in cooperation with the timing control of the laser scanning display LS, the twisted nematic liquid crystal cell TN1 receives the image light 11 (first image light) and converts the polarization state thereof to P polarization to output the image light 13 in the first state where no voltage is applied, and receives the image light 11 (second image light) and maintains the S polarization to output the image light 13 in the second state where a voltage is applied.

Referring to fig. 4, a polarization selective member and a part of a relay image element are disposed along the advancing direction of the image light 13, in this embodiment, the polarization selective member includes a polarization beam splitter PB, and the relay image element includes a half-transmissive half mirror HM disposed between a twisted nematic liquid crystal cell TN1 and the polarization beam splitter PB. The image transfer assembly includes non-rotation symmetrical curved mirror M0, plane mirror M1, plane mirror M2 and optical combiner CB set inside the windshield WS. In addition, the light polarization converter further includes another twisted nematic liquid crystal cell TN2 disposed between the plane mirror M2 and the transflective mirror HM, wherein the twisted nematic liquid crystal cell TN2 between the image transfer members is fixed in a non-voltage state.

When the twisted nematic liquid crystal cell TN1 is in the first state where no voltage is applied, the portion of the first image light 13 in the P-polarization state that penetrates through the half-transmissive half mirror HM continues to penetrate through the polarization beam splitter PB, and then the first image light P1 on the first optical path enters both eyes of the driver D after being sequentially reflected by the curved mirror M0 and the optical combiner CB, and forms a first virtual image VI1 along the line of sight direction of the driver D, where the first virtual image distance of the first virtual image VI1 with respect to the driver D is VID 1. When the twisted nematic liquid crystal cell TN1 is in the second state where a voltage is applied, the portion of the S-polarized second image light 13 that has passed through the half-transmissive half mirror HM is specularly reflected by the polarization beam splitter PB to form second image light P2. The second image light P2 on the second optical path is reflected by a plane mirror M1 and a plane mirror M2 provided at appropriate positions in this order. Further, the mirror M2 places the twisted nematic liquid crystal cell TN2 to which no voltage is applied in the direction in which the second image light P2 advances. The voltage-free twisted nematic liquid crystal cell TN2 twists the second image light P2 in the S polarization state by 90 °, and thus, the second image light P2 in the S polarization state is converted into the P polarization state by the voltage-free twisted nematic liquid crystal cell TN2, and then the second image light P2 in the P polarization state is reflected by the half-transmissive half mirror HM to form the relay image LS'. The relay image LS' of the second image light P2 in the P-polarization state penetrates through the polarization beam splitter PB again, is sequentially reflected by the curved mirror M0 and the optical combiner CB, and then enters both eyes of the driver D, a second virtual image VI2 is formed along the line of sight direction of the driver D, and a second virtual image distance of the second virtual image VI2 to the driver 5 is VID 2.

With continued reference to fig. 4, the laser scanning display LS and the relay image LS 'are both located in the focal point of the curved mirror M0, and the relay image LS' is longer than the object distance of the laser scanning display LS due to the image transfer effect of the three reflections of the plane mirror M1, the plane mirror M2 and the half-transmissive half mirror HM, and therefore, the second virtual image distance VID2 is longer than the first virtual image distance VID 1. Finally, the driver D can see the first virtual image VI1 (first image light content) and the second virtual image VI2 (second image light content) at the same time, and the two image lights form virtual images with different distances and overlapping fields of view by scanning all the pixels of the display LS with the laser light. Compared with the first embodiment, the present embodiment has the advantage that the fields of view of the two virtual images with different distances are overlapped, and can be used for scenes in which near and far contents need to be displayed in an overlapping manner.

Fig. 5 is a schematic side view of a vehicle head-up display system according to a third embodiment of the present invention, in which an image source controls image light output in a time sequence. Referring to fig. 3 and 5, the automotive head-up display system 35 of the third embodiment is different from the automotive head-up display system 31 of fig. 3 in the polarization states of the first image light and the second image light passing through the light polarization converter and in the position arrangement of the optical elements of the relay assembly. In fig. 5, in conjunction with the timing control of the lcd, the S-polarized image light 11 passes through the twisted nematic liquid crystal cell TN, and the S-polarized first image light P1 and the P-polarized second image light P2 are formed in time sequence. Therefore, the first image light P1 in the S-polarization state is specularly reflected by the polarization beam splitter PB, then reflected by a non-rotationally symmetric curved mirror M0, then reflected by the windshield WS, and then enters the two eyes of the driver D to form a first virtual image VI1 along the line of sight of the driver D, and the first virtual image distance of the first virtual image VI1 relative to the driver D is VID 1. Next, the second image P2 in the P-polarization state passes through the polarization beam splitter PB in the original direction and is then reflected by the plane mirror M1 to form a relay image L ', and the relay image L' enters the eyes of the driver D after being reflected by the curved mirror M0 and the windshield WS, and forms a second virtual image VI2 along the line of sight of the driver D, and the second virtual image distance VID2 of the second virtual image VI2 from the driver D. Like the first embodiment, the liquid crystal display L and the relay image L 'are both located in the focal point of the curved mirror M0, and the relay image L' is longer than the object distance of the liquid crystal display L due to the relay effect of the flat mirror M1, and therefore, the second virtual image distance VID2 is longer than the first virtual image distance VID 1. Finally, the first virtual image VI1 and the second virtual image VI2 that the driver D can see simultaneously both utilize virtual images of all pixels of the liquid crystal display L, and the two images have different distances and do not overlap in view. In contrast to the first embodiment, the closer first virtual image distance VID1 uses the S-polarized light reflected by the polarizing beam splitter PB, and the farther second virtual image distance VID2 uses the P-polarized light transmitted through the polarizing beam splitter PB.

Fig. 6 is a side view of a fourth embodiment of the present invention of an automotive heads-up display system 37, wherein the image source controls the image light output in a time sequence. The image source includes a liquid crystal display L having a diagonal dimension of 1.8 inches and emitting light that is S polarized relative to the plane of the paper. The liquid crystal display L emits the first image light and the second image light which are switched fast with a switching frequency of 30Hz or higher. The twisted nematic liquid crystal cell TN1 is disposed on the light-emitting side of the liquid crystal display L, and the liquid crystal display L emits the first image light in the first state where a voltage is applied to the twisted nematic liquid crystal cell TN1 and emits the second image light in the second state where no voltage is applied, so that the image light 13 (the first image light) in the S-polarized state is output in the first state of the twisted nematic liquid crystal cell TN1, and the image light 13 (the second image light) in the P-polarized state is output in the second state. A half-transmissive half mirror HM and a polarizing beam splitter PB are disposed in this order along the traveling direction of the image light 13. When the twisted nematic liquid crystal cell TN1 is in the voltage-applied state 1, a portion of the S-polarized image light 13 that has passed through the half-transmissive half mirror HM is specularly reflected by the polarization beam splitter PB to form first image light P1, and then the first image light P1 enters both eyes of the driver D after being reflected by the curved mirror M0 and the windshield WS, forming a first virtual image VI1 along the line of sight direction of the driver D, and the first virtual image distance VID1 of the first virtual image VI1 with respect to the driver D.

Referring to fig. 6, when the TN1 liquid crystal cell is in the second state of no voltage, the portion of the image light 13 in the P-polarization state that passes through the half-transmissive half mirror HM continues to pass through the polarization beam splitter PB as indicated by the second image light P2, and then is reflected by the mirror M1, the mirror M2, and the mirror M3 in this order. A twisted nematic liquid crystal cell TN2 to which no voltage is applied is disposed in the plane mirror M3 in the direction of the second image light P2 to twist the polarization state of the incident light by 90 °. Therefore, the P-polarized second image light P2 is converted into S-polarized second image light P2 by the twisted nematic liquid crystal cell TN 2. Then, the second image light P2 in the S-polarization state is reflected by the half mirror HM to form a relay image L'. The relay image L' is specularly reflected by the polarization beam splitter PB, and then reflected by the curved mirror M0 and the windshield WS in this order to enter the eyes of the driver D, and forms a second virtual image VI2 along the line of sight of the driver D, and the second virtual image distance of the second virtual image VI2 from the driver 5 is VID 2.

Referring still to fig. 6, similarly to the second embodiment, the liquid crystal display L and the relay image L 'are both located in the focal point of the curved mirror M0, and the relay image L' is longer than the object distance of the liquid crystal display L due to the image transfer function of the flat mirror M1, the flat mirror M2, the flat mirror M3, and the half-transmissive half mirror HM, and therefore, the second virtual image distance VID2 is longer than the first virtual image distance VID 1. Finally, the driver D can simultaneously see virtual images VI1 and VI2 using all the pixels of the liquid crystal display L, which are at different distances and have overlapping fields of view. In this embodiment, compared to the second embodiment, the closer first virtual image distance VID1 uses the S-polarized light reflected by the polarizing beam splitter PB, and the farther second virtual image distance VID2 uses the P-polarized light transmitted through the polarizing beam splitter PB.

The above-mentioned embodiments are merely illustrative of the technical spirit and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and to implement the same, so that the scope of the present invention should not be limited by the above-mentioned embodiments, and all equivalent changes and modifications made in the spirit of the present invention should be covered by the scope of the present invention.

Claims

1. A head-up display system for a vehicle, comprising:

an image source for generating a first image light of a first polarization state and a second image light of the first polarization state by time sequence switching;

a light polarization converter disposed at a light emitting side of the image source and configured to switch the first image light and the second image light corresponding to the image source to synchronously switch a first state and a second state, wherein the light polarization converter in the first state converts the first image light or the second image light in the first polarization state into a second polarization state; and the light polarization converter in the second state maintains the first image light or the second image light in the first polarization state as the first polarization state, and the first polarization state is different from the second polarization state;

a polarization selective member disposed on a light-emitting side of the light polarization converter, for transmitting and specularly reflecting the first image light and the second image light passing through the light polarization converter to initiate a first light path and a second light path, wherein the first light path is derived from a transmitting light-emitting surface of the polarization selective member, and the second light path is derived from a reflecting light-emitting surface of the polarization selective member; and

an image transferring assembly, which is configured to guide the first image light and the second image light to form a first virtual image and a second virtual image respectively, wherein the distance between the first virtual image and the second virtual image is not equal to the distance between a driver, and the image transferring assembly comprises:

at least one relay image is generated for the first image light or the second image light on the second light path by the relay image plane mirror;

a virtual image reflecting surface arranged in front of a visual field of the driver; and

a curved mirror, it set up in on the first light path with on the second light path, curved mirror reflection first light path with the second light path first image light with the second image light extremely the virtual image plane of reflection is in order to generate respectively first virtual image reaches the second virtual image, wherein the distance of first light path is not equal to the distance of second light path.

2. The vehicular heads-up display system of claim 1 wherein the image source comprises a liquid crystal display, an organic light emitting diode display, a digital light processor, a liquid crystal on silicon display, or a laser scanning display.

3. The vehicular heads-up display system of claim 2 wherein the image source further comprises a linear polarizer to emit the first image light of the first polarization state and the second image light of the first polarization state.

4. The vehicular heads-up display system of claim 1, wherein a switching frequency of the image source and the light polarization converter is not less than 30 hz.

5. The vehicular heads-up display system of claim 1, wherein the light polarization converter comprises a first twisted nematic liquid crystal cell disposed on the light emitting side of the image source, the first twisted nematic liquid crystal cell being in the first state when not energized and being in the second state when energized.

6. The vehicular heads-up display system of claim 5, wherein the light polarization converter further comprises a second twisted nematic liquid crystal cell disposed on the second light path.

7. The vehicular heads-up display system of claim 1 wherein the polarization selective component comprises a polarizing beam splitter.

8. The vehicle head-up display system of claim 1 wherein the transfiguration plane mirror is a planar mirror or a half-transmissive half-mirror.

9. The vehicular heads-up display system of claim 8 wherein the transflective mirror is positioned between the light polarization converter and the polarization selective component.

10. The heads-up display system for a vehicle of claim 1, wherein the virtual image reflecting surface is provided by a windshield in front of the field of view of the driver.

11. The vehicular heads-up display system of claim 1 wherein the virtual image reflecting surface is provided by an optical combiner disposed in front of the field of view of the driver.