CN115373145A

CN115373145A - Head-up display device

Info

Publication number: CN115373145A
Application number: CN202110788125.5A
Authority: CN
Inventors: 彭奎恩; 李柏彻; 郭道宏
Original assignee: Coretronic Corp
Current assignee: Coretronic Corp
Priority date: 2021-05-21
Filing date: 2021-07-13
Publication date: 2022-11-22
Also published as: TWI782622B; TW202246843A

Abstract

A head-up display device comprises a display unit, a polarization light splitting module and an optical module. The display unit is used for providing a first image light beam with a first polarization direction and a second image light beam with a second polarization direction. The polarization beam splitting module receives the first image beam and the second image beam from the display unit and transmits the first image beam and the second image beam to the optical module. The first image beam and the second image beam are respectively reflected to a target element outside the head-up display device by the optical module and then transmitted to the target element to form a first virtual image and a second virtual image. Through the polarization light splitting module, the optical path of the first image light beam from the display unit to the position of the first virtual image formed by the first image light beam is larger than the optical path of the second image light beam from the display unit to the position of the second virtual image formed by the second image light beam. The head-up display device can reduce the system volume, reduce the power consumption and further reduce the cost.

Description

Head-up display device

Technical Field

The present invention relates to a display device, and more particularly, to a head-up display device.

Background

In the augmented reality head-up display device for a vehicle, it is generally designed to display images with two different contents. One type of image is a video that can present fixed driving information such as vehicle speed, fuel volume, mileage, speed limit, etc. The other image is to present driving information matched with road conditions, such as left and right turn signs, landmark information, warning signs and the like. The image with the first type of driving information is desirably displayed at a position of a relatively short depth, for example, 2 m, and the image with the second type of driving information is desirably displayed at a position of a relatively long depth, for example, 8 m.

In the current architecture of the augmented reality head-up display device, two image Generation units (PGUs) disposed at different positions are usually used to generate images with different image distances. However, because of the relationship between the two image generating units, the overall architecture has the disadvantages of large volume, large power consumption, large cost, etc.

The background section is only provided to aid in understanding the present disclosure, and thus the disclosure in the background section may include some prior art that does not constitute a part of the knowledge of one skilled in the art. The disclosure in the "background" section is not intended to represent an admission that any of the matter or problems identified in connection with one or more embodiments of the present invention was prior to the filing date of the present application and was recognized by those skilled in the art.

Disclosure of Invention

The invention provides a head-up display device which can reduce the system volume, reduce the power consumption and further reduce the cost.

An embodiment of the invention provides a head-up display device for projecting a first image beam and a second image beam onto a target device. The head-up display device comprises a display unit, a polarization light splitting module and an optical module. The display unit is used for providing a first image light beam with a first polarization direction and a second image light beam with a second polarization direction. The polarization beam splitting module receives the first image beam and the second image beam from the display unit and transmits the first image beam and the second image beam to the optical module. The polarized light splitting module comprises a polarized light splitting layer, a first reflection unit and a second reflection unit. The polarization beam splitting layer is used for guiding the second image light beam to leave the polarization beam splitting module and guiding the first image light beam to the first reflection unit and the second reflection unit. The first reflection unit and the second reflection unit are not located on the optical path of the second image beam. The optical module includes a free-form surface mirror. The free-form surface reflector is used for receiving the first image light beam and the second image light beam from the polarization beam splitting module. The first image light beam and the second image light beam are respectively reflected to the outside of the head-up display device by the optical module and then transmitted to the target element to form a first virtual image and a second virtual image. Through the polarization beam splitting module, the optical path of the first image light beam from the display unit to the position of the first virtual image formed by the first image light beam is larger than the optical path of the second image light beam from the display unit to the position of the second virtual image formed by the second image light beam.

In view of the above, in an embodiment of the invention, the head-up display device is designed to enable a single display unit to generate the first image beam and the second image beam. Therefore, the whole structure of the head-up display device has the advantages of small volume, less power consumption, less cost and the like.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1A is a schematic diagram of a head-up display device according to a first embodiment of the present invention.

Fig. 1B is a schematic diagram of two virtual images formed by the head-up display device according to the first embodiment of the invention.

Fig. 2 is a schematic diagram of a polarization splitting module in a head-up display device according to a second embodiment of the invention.

Fig. 3A is a schematic diagram of an optical path of a polarization beam splitter module in a head-up display device according to a third embodiment of the invention at a first timing.

Fig. 3B is a schematic optical path diagram of the polarization beam splitter module in the head-up display device according to the third embodiment of the invention at the second timing.

Fig. 4A is a schematic optical path diagram of a polarization beam splitter module in a head-up display device according to a fourth embodiment of the invention at a first timing sequence.

Fig. 4B is a schematic optical path diagram of the polarization beam splitter module in the head-up display device according to the fourth embodiment of the invention at the second timing.

Detailed Description

The foregoing and other technical and other features and advantages of the invention will be apparent from the following detailed description of a preferred embodiment, which is to be read in connection with the accompanying drawings. Directional phrases used in the following embodiments (e.g., upper, lower, left, right, front, rear, etc.) refer only to the direction of the appended figures. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.

Fig. 1A is a schematic diagram of a head-up display device according to a first embodiment of the present invention. Fig. 1B is a schematic diagram of two virtual images formed by the heads up display device according to the first embodiment of the invention. Referring to fig. 1A and 1B, an embodiment of the invention provides a head-up display apparatus 100 for projecting a first image beam B1 and a second image beam B1 onto a target device T. The head-up display device 100 is used in a vehicle such as an automobile. The target element T is, for example, a windshield of a motor vehicle. The first image beam B1 and the second image beam B2 are reflected to an eye E of an observer (e.g., a driver of a vehicle) by the target device T, so that the observer can view a first virtual image VM1 and a second virtual image VM2 with different distances and different driving information in front of the target device T.

In the present embodiment, the head-up display device 100 includes a display unit 110, a polarization beam splitting module 120, and an optical module 130. The display unit 110 is used for providing a first image beam B1 having a first polarization direction and a second image beam B2 having a second polarization direction, wherein the first polarization direction and the second polarization direction are perpendicular to each other. For example, the first polarization direction may be P-polarization and the second polarization direction may be S-polarization, or the first polarization direction may be S-polarization and the second polarization direction may be P-polarization, but the invention is not limited thereto.

In detail, in the present embodiment, the display unit 110 has a first effective imaging area E1 and a second effective imaging area E2 which are adjacently disposed. The first effective imaging area E1 and the second effective imaging area E2 are used for generating a first image beam B1 and a second image beam B2, respectively, and the first virtual image VM1 and the second virtual image VM2 formed outside the head-up display 100 present different image contents. The polarization beam splitting module 120 receives the first image beam B1 and the second image beam B2 from the display unit 110, and transmits the first image beam B1 and the second image beam B2 to the optical module 130. In the present embodiment, the first effective imaging area E1 and the second effective imaging area E2 of the display unit 110 are respectively configured with a polarization selection film (not shown), for example, wherein the light emitting surface of the first effective imaging area E1 is configured as the polarization selection film capable of enabling the first image light beam B1 to have the first polarization direction, and the light emitting surface of the second effective imaging area E2 is configured as the polarization selection film capable of enabling the second image light beam B2 to have the second polarization direction.

In the present embodiment, the polarization splitting module 120 includes a first region R1 and a second region R2. The first region R1 is configured to allow the first and second image beams B1 and B2 from the display unit 110 to enter and the first and second image beams B1 and B2 to exit. The second region R2 is adjacent to the first region R1, and is configured to make the first image beam B1 incident and reflected for multiple times before being emitted to the first region R1.

In the present embodiment, the polarized light splitting module 120 further includes a polarization splitting layer 121, a first reflection unit 122, and a second reflection unit 123. The polarization splitting layer 121 is disposed between the first region R1 and the second region R2, and is used for transmitting the first image beam B1 with the first polarization direction and reflecting the second image beam B2 with the second polarization direction. That is, the polarization splitting layer 121 is used to guide the second image beam B2 to leave the polarization splitting module 120 and guide the first image beam B1 to the first reflection unit 122 and the second reflection unit 123. The polarization splitting layer 121 transmits P-polarized light and reflects S-polarized light, or transmits S-polarized light and reflects P-polarized light, for example, but the invention is not limited thereto.

In the present embodiment, the first reflection unit 122 includes a first mirror 122-1 and a first quarter wave plate 122-2. The second reflection unit 123 includes a second mirror 123-1 and a second quarter wave plate 123-2. The first reflection unit 122 and the second reflection unit 123 are disposed beside the second region R2. The first quarter-wave plate 122-2 is disposed between the first reflector 122-1 and the polarization splitting layer 121. The second quarter-wave plate 123-2 is disposed between the second mirror 123-1 and the polarization splitting layer 121. The first mirror 122-1 and the second mirror 123-1 are perpendicular to each other. A second region is defined between the first reflecting unit 122, the second reflecting unit 123 and the polarization splitting layer 121.

In the present embodiment, the first image beam B1 with the first polarization direction from the display unit 110 sequentially penetrates through the first region R1 and the polarization splitting layer 121 and then enters the second region R2. The first image beam B1 sequentially passes through the first quarter-wave plate 122-2, is reflected by the first reflector 122-1, passes through the first quarter-wave plate 122-2, is reflected by the polarization splitting layer 121, passes through the second quarter-wave plate 123-2, is reflected by the second reflector 123-1, passes through the second quarter-wave plate 123-2 and passes through the polarization splitting layer 121, and then passes through the first region R1 to be transmitted to the optical module 130, wherein when the first image beam B1 having the first polarization direction sequentially passes through the first quarter-wave plate 122-2, is reflected by the first reflector 122-1, and passes through the first quarter-wave plate 122-2, the polarization direction of the first image beam B1 having the second polarization direction is converted into the second polarization direction, and further the first image beam B1 having the second polarization direction is reflected by the polarization splitting layer 121, and then the first image beam B1 having the second polarization direction sequentially passes through the second quarter-wave plate 123-2, is reflected by the second reflector 123-1, passes through the second reflector 123-2, and then is converted into the first polarization direction of the first image beam 121. The second image beam B2 with the second polarization direction from the display unit 110 enters the first region R1, and is reflected by the polarization splitting layer 121 and transmitted to the optical module 130. That is, the first reflection unit 122 and the second reflection unit 123 are not located on the optical path of the second image beam B2.

In the present embodiment, the range of the orthographic projection of the first mirror 122-1 on the display unit 110 and the second effective imaging area E2 of the display unit 110 do not overlap each other.

In the embodiment, the first region R1 includes a first light-transmitting body 124, the second region R2 further includes a second light-transmitting body 125, and the polarization splitting layer 121 is disposed between the first light-transmitting body 124 and the second light-transmitting body 125, wherein the light-transmitting body is made of, for example, glass. The polarization splitting layer 121 is disposed on a surface of the second transparent body 125 facing the first transparent body 124, for example, so that a contact area between the first transparent body 124 and the polarization splitting layer 121 is smaller than a total area of the polarization splitting layer 121.

In the present embodiment, the optical module 130 includes a free-form surface mirror (free-form mirror) 132. The free-form surface mirror 132 is used for receiving the first image beam B1 and the second image beam B2 from the polarization beam splitting module 120. The first image beam B1 and the second image beam B2 are respectively reflected by the optical module 130 to the outside of the head-up display device 100, and then transmitted to the target device T to form a first virtual image VM1 and a second virtual image VM2. Through the polarization splitting module 120, the optical path length of the first image light beam B1 from the display unit 110 to the position of the first virtual image VM1 formed by the first image light beam B1 is greater than the optical path length of the second image light beam B2 from the display unit 110 to the position of the second virtual image VM2 formed by the second image light beam B2.

In the embodiment, the head-up display device 100 further includes a sensor 140 and a controller 150. The sensor 150 is used for sensing the position of the eye E. The controller 150 includes, for example, a Micro Controller Unit (MCU), a Central Processing Unit (CPU), a microprocessor (microprocessor), a Digital Signal Processor (DSP), a Programmable Logic Device (PLD), or other similar devices or combinations thereof, but the present invention is not limited thereto. Further, in an embodiment, the functions of the controller 150 may be implemented as a plurality of program codes. The program codes are stored in a memory and executed by the controller 150. Alternatively, in an embodiment, the functions of the controller 150 may be implemented as one or more circuits. The present invention is not limited to the implementation of the functions of the controller 150 in software or hardware.

In the present embodiment, the controller 150 is electrically connected to the sensor 140 and coupled to the optical module 130. The optical module 130 includes a driver (not shown) electrically connected to the free-form surface mirror 132 for driving the free-form surface mirror 132 to swing, and the controller 150 receives the signal from the sensor 140 and controls the driver to adjust the swing angle of the free-form surface mirror 132 corresponding to the position change of the eyes E of the user (driving), so that the first virtual image VM1 and the second virtual image VM2 are clearly shown.

In view of the above, in an embodiment of the invention, the head-up display apparatus 100 is designed to enable the display unit 110 to simultaneously generate the first image beam B1 with the first polarization direction and the second image beam B2 with the second polarization direction. The optical path of the head-up display device 100 is designed to: the first image light beam B1 is reflected three times by the polarization beam splitting module 120, and the second image light beam B2 is reflected once by the polarization beam splitting module 120, so that an optical path of the first image light beam B1 from the display unit 110 to the position of the first virtual image VM1 is greater than an optical path of the second image light beam B2 from the display unit 110 to the position of the second virtual image VM2. Therefore, the whole structure of the head-up display device 100 has the advantages of smaller volume, less power consumption, less cost, etc.

Fig. 2 is a schematic diagram of a polarization splitting module in a head-up display device according to a second embodiment of the invention. Referring to fig. 2, the polarization splitting module 120A of fig. 2 is similar to the polarization splitting module 120 of fig. 1A, and the main differences are as follows. In the present embodiment, the range of the orthographic projection of the first mirror 122-2 on the display unit 110 and the second effective imaging area E2 of the display unit 110 overlap each other.

In the present embodiment, the first region R1 includes a first transparent body 124A, and the second region R2 further includes a second transparent body 125. The polarization splitting layer 121 is disposed on a surface of the second transparent body 125 facing the first transparent body 124A or a surface of the first transparent body 124A facing the second transparent body 125, and is located between the first transparent body 124A and the second transparent body 125, and a contact area between the first transparent body 124A and the polarization splitting layer 121 is equal to a total area of the polarization splitting layer 121. The advantages of the head-up display device according to the second embodiment of the invention are similar to the head-up display device 100 of fig. 1A, and are not repeated herein.

Fig. 3A is a schematic optical path diagram of a polarization beam splitter module in a head-up display device according to a third embodiment of the invention at a first timing sequence. Fig. 3B is a schematic optical path diagram of the polarization beam splitter module in the head-up display device according to the third embodiment of the invention at the second timing. Referring to fig. 3A and 3B, the polarization splitting module 120B of fig. 3A or 3B is similar to the polarization splitting module 120 of fig. 1A, and the relative position of the virtual image formed by the polarization splitting module 120B of fig. 3A or 3B is also similar to that of fig. 1B, and the main differences are as follows. In the present embodiment, the display unit 110 includes an effective imaging area E3. The effective imaging area E3 is configured to generate a first image beam B1 and a second image beam B2 at different timings, and the first virtual image VM1 and the second virtual image VM2 formed outside the head-up display present different image contents (as shown in fig. 1B).

In this embodiment, the head-up display device further comprises a polarization switching device 112. The polarization switching device 112 is disposed between the display unit 110 and the polarization splitting module 120B. The polarization switching device 112 is, for example, a polarization rotator (polarization rotator) such as a liquid crystal panel. At the first timing, the first image beam B1 emitted by the display unit 110 passes through the polarization switching device 112 and has a first polarization direction. At the second timing, the second image beam B2 emitted by the display unit 110 has the second polarization direction by passing through the polarization switching device 112.

In the present embodiment, the first region R1 includes a first light-transmitting body 124A, and the second region R2 further includes a second light-transmitting body 125. The polarization beam splitting layer 121 is disposed between the second transparent body 125 and the first transparent body 124A, and a contact area between the first transparent body 124A and the polarization beam splitting layer 121 is equal to a total area of the polarization beam splitting layer 121. The advantages of the head-up display device according to the third embodiment of the invention are similar to those of the head-up display device 100 shown in fig. 1A, and are not described herein again.

Fig. 4A is a schematic optical path diagram of a polarization beam splitter module in a head-up display device according to a fourth embodiment of the invention at a first timing sequence. Fig. 4B is a schematic diagram of optical paths of a polarization beam splitter module in a head-up display device according to a fourth embodiment of the invention at a second timing. Referring to fig. 4A and 4B, the polarization splitting module 120C of fig. 4A or 4B is similar to the polarization splitting module 120 of fig. 1A, and the relative position of the virtual image formed by the polarization splitting module 120C of fig. 4A or 4B is also similar to that of fig. 1B, and the main differences are as follows. In the present embodiment, the optical path of the head-up display device is designed such that: the first image beam B1 is reflected three times at the polarization beam splitter module 120C, but the second image beam B2 directly penetrates through the polarization beam splitter module 120C.

In detail, in the present embodiment, the polarization splitting module 120C includes a first region R1 and a second region R2. The first region R1 is disposed between the display unit 110 and the second region R2. The polarization splitting layer 121 is disposed between the first region R1 and the second region R2, and configured to reflect the first image beam B1 having the first polarization direction and transmit the second image beam B2 having the second polarization direction.

In the embodiment, the first reflection unit 122C and the second reflection unit 123C are respectively disposed beside the first region R1 and beside the second region R2, and the first reflection unit 122C and the second reflection unit 123C are respectively located at two opposite sides of the polarization splitting module 120C. The first mirror 122-1 'and the second mirror 123-1' are parallel to each other. The first image beam B1 from the display unit 110 enters the first region R1 and is reflected by the polarization splitting layer 121. The first image beam B1 sequentially penetrates the first quarter-wave plate 122-2', is reflected by the first reflector 122-1', penetrates the first quarter-wave plate 122-2', penetrates the polarization splitting layer 121, enters the second region R2, penetrates the second quarter-wave plate 123-2', is reflected by the second reflector 123-1', penetrates the second quarter-wave plate 123-2', is reflected by the polarization splitting layer 121, and then penetrates the second region R2 to be transmitted to the optical module 130. After the first image beam B1 with the first polarization direction sequentially penetrates the first quarter-wave plate 122-2', is reflected by the first reflector 122-1', and penetrates the first quarter-wave plate 122-2', the polarization direction of the first image beam B1 is converted into the second polarization direction, and then the first image beam B1 with the second polarization direction penetrates the polarization splitting layer 121, and then the first image beam B1 with the second polarization direction sequentially penetrates the second quarter-wave plate 123-2', is reflected by the second reflector 123-1', and penetrates the second quarter-wave plate 123-2', the polarization direction of the first image beam B1 is converted into the first polarization direction, and then is reflected by the polarization splitting layer 121. As shown in fig. 4B, the second image beam B2 from the display unit 110 enters the first region R1, and then sequentially passes through the polarization splitting layer 121 and the second region R2 to be transmitted to the optical module 130.

In addition, the advantages of the head-up display device according to the fourth embodiment of the invention are similar to the head-up display device 100 of fig. 1A, and are not described herein again.

In summary, in an embodiment of the invention, the head-up display device is designed such that the display unit generates the first image beam and the second image beam, and the optical path length of the first image beam from the display unit to the position of the first virtual image is greater than the optical path length of the second image beam from the display unit to the position of the second virtual image by the design of the polarization beam splitting module. Therefore, the whole structure of the head-up display device has the advantages of small volume, less power consumption, less cost and the like.

The above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made according to the claims and the specification of the present invention are still within the scope of the present invention. Furthermore, it is not necessary for any embodiment or claim of the invention to achieve all of the objects or advantages or features disclosed herein. In addition, the abstract and the title of the specification are only used for assisting the search of patent documents and are not used for limiting the scope of the invention. Furthermore, the terms "first," "second," and the like, as used herein or in the appended claims, are used merely to name elements (elements) or to distinguish one embodiment or range from another, and are not intended to limit the upper or lower limit on the number of elements.

List of reference numerals

100 head-up display device

110 display unit

112 polarization switching device

120. 120A, 120B, 120C polarization beam splitting module

121 polarization splitting layer

122. 122C first reflection unit

122-1, 122-1' first reflecting mirror

122-2, 122-2' a first quarter wave plate

123. 123C second reflection unit

123-1, 123-1' second reflector

123-2, 123-2' and a second quarter wave plate

123 third reflecting surface

124. 124A, 120B a first light-transmitting body

125 the second light transmission body

130 optical module

132 free-form surface mirror

140 sensor

150 controller

B1 first image beam

B2 second image light beam

E eye

E1 first effective imaging area

E2 second effective imaging area

E3 effective imaging area

R1 is the first region

R2 is the second region

T target element

VM1 first virtual image

VM2: second virtual image.

Claims

1. A head-up display device for projecting a first image beam and a second image beam onto a target element comprises a display unit, a polarization beam splitting module and an optical module,

the display unit is used for providing the first image light beam with a first polarization direction and the second image light beam with a second polarization direction;

the polarization beam splitting module receives the first image beam and the second image beam from the display unit and transmits the first image beam and the second image beam to the optical module, wherein the polarization beam splitting module comprises a polarization beam splitting layer, a first reflection unit and a second reflection unit, the polarization beam splitting layer is used for guiding the second image beam to leave the polarization beam splitting module and guiding the first image beam to the first reflection unit and the second reflection unit, and the first reflection unit and the second reflection unit are not positioned on the light path of the second image beam; and

the optical module comprises a free-form surface reflector for receiving the first image beam and the second image beam from the polarization beam splitting module, the first image beam and the second image beam are respectively reflected to the outside of the head-up display device by the optical module and then transmitted to the target element to form a first virtual image and a second virtual image, wherein, through the polarization beam splitting module, the optical path of the first image beam from the display unit to the position of the first virtual image formed by the first image beam is larger than the optical path of the second image beam from the display unit to the position of the second virtual image formed by the second image beam.

2. The heads-up display device of claim 1 wherein the first polarization direction and the second polarization direction are perpendicular to each other.

3. The heads-up display device of claim 1 further comprising a sensor and a controller, wherein,

the sensor is used for sensing the position of the eyes; and

the controller is electrically connected with the sensor and coupled with the optical module, receives the signal from the sensor, and adjusts the deflection angle of the free-form surface reflector corresponding to the position change of the eyes, so that the first virtual image and the second virtual image are clearly presented.

4. The heads-up display device according to claim 1, wherein the first reflection unit comprises a first mirror and a first quarter-wave plate, and the second reflection unit comprises a second mirror and a second quarter-wave plate, wherein the first quarter-wave plate is disposed between the first mirror and the polarization-splitting layer, and the second quarter-wave plate is disposed between the second mirror and the polarization-splitting layer.

5. The head-up display device according to claim 4, wherein the polarization splitting module comprises:

a first region configured to be incident and emergent from the first image beam and the second image beam of the display unit; and

a second area adjacent to the first area and configured to emit the first image beam to the first area after being incident and reflected for multiple times;

the polarization splitting layer is disposed between the first area and the second area, and is configured to transmit the first image beam with the first polarization direction and reflect the second image beam with the second polarization direction.

6. The head-up display device according to claim 5, wherein the first and second reflection units are disposed beside the second region and the first and second reflection mirrors are perpendicular to each other;

the first image beam from the display unit sequentially penetrates the first region and the polarization splitting layer and then enters the second region, and the first image beam sequentially penetrates the first quarter-wave plate, is reflected by the first reflector, penetrates the first quarter-wave plate, is reflected by the polarization splitting layer, penetrates the second quarter-wave plate, is reflected by the second reflector, penetrates the second quarter-wave plate and penetrates the polarization splitting layer, and then penetrates the first region and is transmitted to the optical module;

the second image beam from the display unit enters the first area, is reflected by the polarization splitting layer and is transmitted to the optical module.

7. The head-up display device of claim 5, wherein the display unit has a first active imaging area and a second active imaging area disposed adjacent to each other for generating the first image beam and the second image beam, respectively, and the first virtual image and the second virtual image formed outside the head-up display device represent different image contents.

8. The head-up display device according to claim 7, wherein a range of the orthographic projection of the first mirror on the display unit and the second effective imaging area of the display unit do not overlap each other.

9. The head-up display device according to claim 7, wherein the first region comprises a first light-transmissive body, and the second region further comprises a second light-transmissive body, the polarization splitting layer is disposed on a surface of the second light-transmissive body facing the first light-transmissive body and between the first light-transmissive body and the second light-transmissive body, and a contact area of the first light-transmissive body and the polarization splitting layer is smaller than a total area of the polarization splitting layer.

10. The head-up display device according to claim 7, wherein a range of the orthographic projection of the first mirror on the display unit and the second effective imaging area of the display unit overlap each other.

11. The head-up display device according to claim 7, wherein the first region comprises a first light-transmissive body, and the second region further comprises a second light-transmissive body, the polarization splitting layer is disposed on a surface of the second light-transmissive body facing the first light-transmissive body or a surface of the first light-transmissive body facing the second light-transmissive body and between the first light-transmissive body and the second light-transmissive body, and a contact area of the first light-transmissive body and the polarization splitting layer is equal to a total area of the polarization splitting layer.

12. The head-up display device according to claim 5, wherein the display unit comprises an effective imaging area for generating the first image beam and the second image beam at different timings, and the first virtual image and the second virtual image formed outside the head-up display present different image contents.

13. The head-up display device according to claim 12, further comprising a polarization switching device, wherein the polarization switching device is disposed between the display unit and the polarization beam splitting module, and at a first timing, the first image beam emitted by the display unit passes through the polarization switching device to have the first polarization direction; in a second timing sequence, the second image beam emitted by the display unit passes through the polarization switching device and has the second polarization direction.

14. The head-up display device according to claim 12, wherein the first region includes a first light-transmissive body, and the second region further includes a second light-transmissive body, and a contact area of the first light-transmissive body and the second light-transmissive body is equal to an area of the polarization splitting layer.

15. The head-up display device of claim 4, wherein the polarization splitting module comprises a first region and a second region, wherein,

the first region is disposed between the display unit and the second region, and the polarization splitting layer is disposed between the first region and the second region and configured to reflect the first image beam having the first polarization direction and transmit the second image beam having the second polarization direction.

16. The head-up display device according to claim 15, wherein the first and second reflection units are respectively disposed beside the first and second regions and the first and second reflection mirrors are parallel to each other;

the first image beam from the display unit enters the first region and is reflected by the polarization splitting layer, and the first image beam sequentially penetrates the first quarter-wave plate, is reflected by the first reflector, penetrates the first quarter-wave plate, penetrates the polarization splitting layer, enters the second region, penetrates the second quarter-wave plate, is reflected by the second reflector, penetrates the second quarter-wave plate, is reflected by the polarization splitting layer, and then penetrates the second region to be transmitted to the optical module;

after entering the first area, the second image beam from the display unit sequentially penetrates through the polarization splitting layer and the second area and is transmitted to the optical module.