Head-up display device

Abstract

To provide a head-up display device including a display unit, a polarization beam-splitting module, and an optical module.SOLUTION: A display unit provides a first image beam having a first polarization direction and a second image beam having a second polarization direction. A 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 by the optical module to a target element outside the head-up display device and then transmitted to the target element to form a first virtual image and a second virtual image. By the polarization beam-splitting module, the optical path length of the first image beam from the display unit to a position of the first virtual image formed by itself is longer than the optical path length of the second image beam from the display unit to a position of the second virtual image formed by itself. The head-up display device can reduce system volume, power consumption, and cost.SELECTED DRAWING: Figure 1A

Description

Technical Field

[0001] The present invention relates to a display device, and particularly to a head-up display device.

Background Art

[0002] An in-vehicle augmented reality head-up display device is generally designed to display two different types of content images. One type of image displays predetermined driving information, such as vehicle speed, fuel level, mileage, speed limit, etc. The other type of image displays driving information according to road conditions, such as left and right turn signs, location guides, warning signs, etc. An image having the first type of driving information is preferably displayed at a shallow (front) position, such as 2 meters ahead, and an image having the second type of driving information is displayed at a deep (rear) position, such as 8 meters ahead.

[0003] In the structure of a conventional augmented reality head-up display device, generally two image generation units (Picture Generation Unit, PGU) placed at different positions are used to generate images having different image distances in depth. However, due to the installation of two image generation units, there are drawbacks such as a relatively large volume of the overall structure, relatively high power consumption, and relatively high cost.

[0004] The "Background Art" section is only intended to facilitate the understanding of the invention content, and the disclosed content in the "Background Art" may include some configurations other than the prior art known to those skilled in the art. The content disclosed in the "Background Art" does not mean that the problems to be solved by the content or one or more embodiments of the present invention have already been grasped or recognized by those skilled in the art before the filing of the present invention.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention provides a head-up display device that can reduce the system volume, reduce power consumption, and further reduce costs. [Means for solving the problem]

[0006] One embodiment of the present invention provides a head-up display device that projects a first image beam and a second image beam onto a target element. The head-up display device includes a display unit, a polarization spectrometer module, and an optical module. The display unit provides a first image beam having a first polarization direction and a second image beam having a second polarization direction. The polarization spectrometer 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 polarization spectrometer module includes a polarization spectrometer layer, a first reflection unit, and a second reflection unit. The polarization spectrometer layer guides the second image beam away from the polarization spectrometer module and guides the first image 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 reflector. The free-form surface reflector receives the first image beam and the second image beam from the polarization spectrometer module. The first image beam and the second image beam are reflected by the optical module to the outside of the head-up display device and further transmitted to the target element to form the first and second virtual images. Via the polarization spectroscopy module, the optical path length of the first image beam from the display unit to the position of the first virtual image it forms is greater than the optical path length of the second image beam from the display unit to the position of the second virtual image it forms.

[0007] As described above, in one embodiment of the present invention, the head-up display device is designed to generate a first image luminous flux and a second image luminous flux using a single display unit. Therefore, the overall structure of the head-up display device has advantages such as a relatively small volume, relatively low power consumption, and relatively low cost.

[0008] To more clearly and understandably demonstrate the features and advantages of the present invention, the following will be described in detail with reference to examples and drawings. [Brief explanation of the drawing]

[0009] [Figure 1A] A schematic diagram of a head-up display device according to the first embodiment of the present invention. [Figure 1B] A schematic diagram of two virtual images formed by a head-up display device according to the first embodiment of the present invention. [Figure 2] A schematic diagram of a polarization spectrometer module in a head-up display device according to a second embodiment of the present invention. [Figure 3A] A schematic diagram of the optical path in the polarization spectrometer module in a head-up display device according to a third embodiment of the present invention in the first time sequence. [Figure 3B] A schematic diagram of the optical path in the polarizing spectrometer module in a head-up display device according to a third embodiment of the present invention in the second time sequence. [Figure 4A] A schematic diagram of the optical path in the first time sequence of a polarization spectrometer module in a head-up display device according to a fourth embodiment of the present invention. [Figure 4B] A schematic diagram of the optical path in the polarizing spectrometer module in a head-up display device according to a fourth embodiment of the present invention in the second time sequence. [Modes for carrying out the invention]

[0010] In order to clearly illustrate the above and other technical details, features, and effects of the present invention, preferred embodiments will be described in detail below with reference to the drawings. Directional terms used in the following embodiments (e.g., up, down, left, right, front, or back) refer only to the directions shown in the drawings. Therefore, these directional terms are used for illustrative purposes only and do not limit the present invention.

[0011] Figure 1A is a schematic diagram of a head-up display device according to a first embodiment of the present invention. Figure 1B is a schematic diagram of two virtual images formed by the head-up display device according to a first embodiment of the present invention. Referring to Figures 1A and 1B, one embodiment of the present invention provides a head-up display device 100 that projects a first image luminous beam B1 and a second image luminous beam B2 to a target element T. The head-up display device 100 is applied to means of transportation such as an automobile. The target element T is, for example, the windshield of an automobile. When the first image luminous beam B1 and the second image luminous beam B2 are reflected by the target element T to the eyes E of an observer (e.g., the driver of the means of transportation), the observer can see a first virtual image VM1 and a second virtual image VM2 in front of the target object T, having different imaging distances and different driving information.

[0012] In this embodiment, the head-up display device 100 includes a display unit 110, a polarization spectrometer module 120, and an optical module 130. The display unit 110 provides a first image luminous beam B1 having a first polarization direction and a second image luminous beam B2 having a second polarization direction, wherein the first and second polarization directions are perpendicular to each other. For example, the first polarization direction may be P-polarized and the second polarization direction may be S-polarized, or the first polarization direction may be S-polarized and the second polarization direction may be P-polarized, but the present invention is not limited thereto.

[0013] More specifically, in this embodiment, the display unit 110 has a first effective imaging region E1 and a second effective imaging region E2 arranged adjacent to each other. The first effective imaging region E1 and the second effective imaging region E2 each generate a first image luminous beam B1 and a second image luminous beam B2, and show different image content in the first virtual image VM1 and the second virtual image VM2 formed outside the head-up display device 100. The polarization spectroscopic module 120 receives the first image luminous beam B1 and the second image luminous beam B2 from the display unit 110 and transmits the first image luminous beam B1 and the second image luminous beam B2 to the optical module 130. In this embodiment, a polarization-selective film (not shown) is arranged in the first effective imaging region E1 and the second effective imaging region E2 of the display unit 110, for example, and the light emission surface of the first effective imaging region E1 is arranged with a polarization-selective film that brings a first polarization direction to the first image light beam B1, and the light emission surface of the second effective imaging region E2 is arranged with a polarization-selective film that brings a second polarization direction to the second image light beam B2.

[0014] In this embodiment, the polarization spectroscopy module 120 includes a first region R1 and a second region R2. The first region R1 is arranged to receive the first image luminous beam B1 and the second image luminous beam B2 from the display unit 110 and to emit the first image luminous beam B1 and the second image luminous beam B2. The second region R2 is adjacent to the first region R1 and is arranged to receive the first image luminous beam B1, reflect it multiple times, and then emit it back to the first region R1.

[0015] In this embodiment, the polarization spectroscopy module 120 further includes a polarization spectroscopy layer 121, a first reflection unit 122, and a second reflection unit 123. The polarization spectroscopy layer 121 is positioned between a first region R1 and a second region R2, and transmits a first image luminous beam B1 having a first polarization direction and reflects a second image luminous beam B2 having a second polarization direction. That is, the polarization spectroscopy layer 121 guides the second image luminous beam B2 away from the polarization spectroscopy module 120 and guides the first image luminous beam B1 to the first reflection unit 122 and the second reflection unit 123. The polarization spectroscopy layer 121 transmits P-polarized light and reflects S-polarized light, or transmits S-polarized light and reflects P-polarized light, but the present invention is not limited thereto.

[0016] In this embodiment, the first reflective unit 122 includes a first reflector 122-1 and a first quarter-wave plate 122-2. The second reflective unit 123 includes a second reflector 123-1 and a second quarter-wave plate 123-2. The first reflective unit 122 and the second reflective unit 123 are positioned next to the second region R2. The first quarter-wave plate 122-2 is positioned between the first reflector 122-1 and the polarization spectral layer 121. The second quarter-wave plate 123-2 is positioned between the second reflector 123-1 and the polarization spectral layer 121. The first reflector 122-1 and the second reflector 123-1 are perpendicular to each other. The area between the first reflective unit 122, the second reflective unit 123 and the polarization spectral layer 121 is defined as the second region.

[0017] In this embodiment, the first image light beam B1 having a first polarization direction from the display unit 110 passes through the first region R1 and the polarization spectral layer 121 in sequence before entering the second region R2. The first image light beam B1 then 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 again, is reflected by the polarization spectral 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 spectral layer 121, before passing through the first region R1 and being transmitted to the optical module 130. Here, the first image luminous beam B1 having the first polarization direction passes through the first quarter-wave plate 122-2 in sequence, is reflected by the first reflector 122-1, and after passing through the first quarter-wave plate 122-2, the polarization direction of the first image luminous beam B1 is converted to the second polarization direction, and the first image luminous beam B1 having the second polarization direction is reflected by the polarization spectral layer 121, and the first image luminous beam B1 having the second polarization direction passes through the second quarter-wave plate 123-2 in sequence, is reflected by the second reflector 123-1, and after passing through the second quarter-wave plate 123-2, the polarization direction of the first image luminous beam B1 is converted to the first polarization direction and passes through the polarization spectral layer 121 again. The second image luminous beam B2 having the second polarization direction from the display unit 110 enters the first region R1, is reflected by the polarization spectral layer 121 and transmitted to the optical module 130. In other words, the first reflection unit 122 and the second reflection unit 123 are not located on the optical path of the second image light beam B2.

[0018] In this embodiment, the orthographic projection range of the first reflector 122-1 on the display unit 110 does not overlap with the second effective imaging area E2 of the display unit 110.

[0019] In this embodiment, the first region R1 includes a first transparent body 124, and the second region R2 further includes a second transparent body 125. The polarizing spectral layer 121 is positioned between the first transparent body 124 and the second transparent body 125, and the material of the transparent body is, for example, glass. The polarizing spectral layer 121 is positioned, for example, on the surface of the second transparent body 125 facing the first transparent body 124, and the contact area between the first transparent body 124 and the polarizing spectral layer 121 is smaller than the total area of ​​the polarizing spectral layer 121.

[0020] In this embodiment, the optical module 130 includes a free-form mirror 132. The free-form mirror 132 receives the first image light beam B1 and the second image light beam B2 from the polarization beam splitter module 120. The first image light beam B1 and the second image light beam B2 are respectively reflected by the optical module 130 to the outside of the head-up display device 100 and transmitted to the target element T to form the first virtual image VM1 and the second virtual image VM2. Via the polarization beam splitter 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 it forms 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 it forms.

[0021] In this embodiment, the head-up display device 100 further includes a sensor 140 and a controller 150. The sensor 140 detects the position of the eye E. The controller 150 includes, for example, a microcontroller unit (MCU), a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), a programmable controller, a programmable logic device (PLD), other similar devices, or a combination of these devices, but the present invention is not limited thereto. Also, in one embodiment, each function of the controller 150 can be realized by a plurality of program codes. These program codes are stored in the memory, and the controller 150 executes these program codes. Or, in one embodiment, each function of the controller 150 can also be realized by one or more electric circuits. The present invention does not limit how to realize each mechanism of the controller 150 in a software or hardware manner.

[0022] In this embodiment, the controller 150 is electrically connected to the sensor 140 and coupled to the optical module 130. The optical module 130 includes a drive (not shown) that is electrically connected to the free-form surface mirror 132. The drive drives the yawing of the free-form surface mirror 132. The controller 150 receives a signal from the sensor 140 and controls the drive according to the change in the position of the user's (driver's) eye E, and adjusts the yawing angle of the free-form surface mirror 132 to clearly display the first virtual image VM1 and the second virtual image VM2.

[0023] As described above, in one embodiment of the present invention, the head-up display device 100 is designed such that the display unit 110 simultaneously generates a first image light beam B1 having a first polarization direction and a second image light beam B2 having a second polarization direction. The optical path of the head-up display device 100 is designed such that the first image light beam B1 is reflected three times by the polarization beam splitter module 120, and the second image light beam B2 is reflected once by the polarization beam splitter module 120, and the optical path from the display unit 110 of the first image light beam B1 to the position of the first virtual image VM1 is larger than the optical path length from the display unit 110 of the second image light beam B2 to the position of the second virtual image VM2. Thereby, the head-up display device 100 has advantages such as a relatively small volume of the overall structure, relatively low power consumption, and relatively low cost.

[0024] FIG. 2 is a schematic diagram of a polarization beam splitter module in a head-up display device according to a second embodiment of the present invention. Referring to FIG. 2, the polarization beam splitter module 120A in FIG. 2 is similar to the polarization beam splitter module 120 in FIG. 1A, but the main differences are as follows. In this embodiment, the range of the orthographic projection of the first mirror 122-2 on the display unit 110 overlaps with the second effective imaging region E2 of the display unit 110.

[0025] In this embodiment, the first region R1 includes the first transparent body 124A, and the second region R2 further includes the second transparent body 125. The polarizing spectral layer 121 is disposed on the surface of the second transparent body 125 facing the first transparent body 124A, or on the 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, with the contact area between the first transparent body 124A and the polarizing spectral layer 121 being equal to the total area of ​​the polarizing spectral layer 121. The advantages of the head-up display device of the second embodiment of the present invention are similar to those of the head-up display device 100 in Figure 1A, and are therefore omitted here.

[0026] Figure 3A is a schematic diagram of the optical path of the polarization spectrometer module in a head-up display device according to a third embodiment of the present invention in a first time sequence. Figure 3B is a schematic diagram of the optical path of the polarization spectrometer module in a head-up display device according to a third embodiment of the present invention in a second time sequence. Referring to Figures 3A and 3B, the polarization spectrometer module 120B in Figure 3A or Figure 3B is similar to the polarization spectrometer module 120 in Figure 1A, and the relative position of the virtual image formed by the polarization spectrometer module 120B in Figure 3A or Figure 3B is also similar to that in Figure 1B, but the main differences are as follows. In this embodiment, the display unit 110 includes an effective imaging region E3. The effective imaging region E3 generates a first image luminous beam B1 and a second image luminous beam B2 in different time sequences and shows different image content in the first virtual image VM1 and the second virtual image VM2 formed outside the head-up display device (as shown in Figure 1B).

[0027] In this embodiment, the head-up display device further includes a polarization switching device 112. The polarization switching device 112 is positioned between the display unit 110 and the polarization spectrometer module 120B. The polarization switching device 112 is, for example, a polarization rotator such as a liquid crystal panel. In the first time sequence, the first image luminous beam B1 emitted by the display unit 110 is polarized in the first polarization direction by the polarization switching device 112. In the second time sequence, the second image luminous beam B2 emitted by the display unit 110 is polarized in the second polarization direction by the polarization switching device 112.

[0028] In this embodiment, the first region R1 includes the first transparent body 124A, and the second region R2 further includes the second transparent body 125. The polarizing spectral layer 121 is positioned between the second transparent body 125 and the first transparent body 124A, and the contact area between the first transparent body 124A and the polarizing spectral layer 121 is equal to the total area of ​​the polarizing spectral layer 121. The advantages of the head-up display device of the third embodiment of the present invention are similar to those of the head-up display device 100 in Figure 1A, and are therefore omitted here.

[0029] Figure 4A is a schematic diagram of the optical path of the polarization spectrometer module in a head-up display device according to the fourth embodiment of the present invention in the first time sequence. Figure 4B is a schematic diagram of the optical path of the polarization spectrometer module in a head-up display device according to the fourth embodiment of the present invention in the second time sequence. Referring to Figures 4A and 4B, the polarization spectrometer module 120C in Figure 4A or Figure 4B is similar to the polarization spectrometer module 120 in Figure 1A, and the relative position of the virtual image formed by the polarization spectrometer module 120C in Figure 4A or Figure 4B is also similar to that in Figure 1B, but the main differences are as follows. In this embodiment, the optical path of the head-up display device is designed so that the first image luminous beam B1 is reflected three times by the polarization spectrometer module 120C, and the second image luminous beam B2 is transmitted directly through the polarization spectrometer module 120C.

[0030] More specifically, in this embodiment, the polarization spectroscopy module 120C includes a first region R1 and a second region R2. The first region R1 is positioned between the display unit 110 and the second region R2. The polarization spectroscopy layer 121 is installed between the first region R1 and the second region R2, and reflects the first image light beam B1 having a first polarization direction and transmits the second image light beam B2 having a second polarization direction.

[0031] In this embodiment, the first reflective unit 122C and the second reflective unit 123C are positioned adjacent to the first region R1 and the second region R2, respectively, and are located on opposite sides of the polarization spectroscopic module 120C. The first reflector 122-1' and the second reflector 123-1' are parallel to each other. The first image luminous beam B1 from the display unit 110 enters the first region R1 and is reflected by the polarization spectroscopic layer 121. The first image light 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', passes through the polarization spectral layer 121, enters the second region R2, 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 is reflected by the polarization spectral layer 121, before passing through the second region R2 again and being transmitted to the optical module 130. Here, the first image luminous beam B1 having the first polarization direction passes through the first quarter-wave plate 122-2' in sequence, is reflected by the first reflector 122-1', and after passing through the first quarter-wave plate 122-2', the polarization direction of the first image luminous beam B1 is converted to the second polarization direction. Furthermore, the first image luminous beam B1 having the second polarization direction passes through the polarization spectral layer 121, and the first image luminous beam B1 having the second polarization direction passes through the second quarter-wave plate 123-2' in sequence, is reflected by the second reflector 123-1', and after passing through the second quarter-wave plate 123-2', the polarization direction of the first image luminous beam B1 is converted to the first polarization direction and is reflected again by the polarization spectral layer 121. As shown in Figure 4B, the second image luminous beam B2 from the display unit 110 enters the first region R1, then passes through the polarization spectral layer 121 in sequence, and the second region R2 is transmitted to the optical module 130.

[0032] Furthermore, the advantages of the head-up display device of the fourth embodiment of the present invention are similar to those of the head-up display device 100 in Figure 1A, and are therefore omitted here.

[0033] In summary, in one embodiment of the present invention, the head-up display device generates a first image luminous beam and a second image luminous beam in the display unit, and the design of the polarization spectroscopic module is such that the optical path length of the first image luminous beam from the display unit to the position of the first virtual image is greater than the optical path length of the second image luminous beam from the display unit to the position of the second virtual image. As a result, the head-up display device has the advantages of a relatively small overall structure volume, relatively low power consumption, and relatively low cost.

[0034] The above are merely preferred embodiments of the present invention and should not limit the scope of implementation. That is, any simple and equivalent changes and modifications made based on the claims and content of the invention fall within the scope of the present invention. Furthermore, any embodiment or claim of the present invention does not necessarily possess all the purposes, advantages, or features disclosed herein. Also, the abstract and the title of the invention are for use in patent literature searches and do not limit the scope of rights of the present invention. In addition, terms such as "first," "second," etc., mentioned in the specification or claims indicate the names of elements or distinguish different embodiments or scopes, and do not limit the upper or lower limit of the number of elements. [Explanation of Symbols]

[0035] 100 Head-Up Display Devices 110 Display Unit 112 Polarization switching device 120, 120A, 120B, 120C Polarization Spectroscopy Module 121 Polarization layer 122, 122C First Reflection Unit 122-1, 122-1' 1st reflector 122-2, 122-2' First Quarter Wave Plate 123, 123C Second Reflection Unit 123-1, 123-1' 2nd reflector 123-2, 123-2' Second Quarter Wave Plate 124, 124A 1st transparent body 125 Second transparent body 130 Optical Modules 132 Free-form reflector 140 sensors 150 controllers B1 First Image Light Beam B2 Second Image Light Beam E eye E1 First effective imaging region E2 2nd effective imaging area E3 Effective imaging area R1 1st area R2 2nd area T Target element VM1 First Virtual Image VM2 Second Virtual Image

Claims

1. A head-up display device, The head-up display device projects a first image beam and a second image beam to the target element. The head-up display device includes a display unit, a polarization spectrometer, and an optical module. The display unit provides the first image light beam having a first polarization direction and the second image light beam having a second polarization direction. The polarization spectrometer 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 polarization spectrometer module includes a polarization spectrometer layer, a first reflection unit, and a second reflection unit. The polarization spectroscopy layer guides the second image beam away from the polarization spectroscopy module and guides the first image beam to the first and second reflection units, so that the first and second reflection units are not located on the optical path of the second image beam. The optical module includes a free-form surface reflecting mirror and receives the first image beam and the second image beam from the polarization spectrometer. The first image beam and the second image beam are each reflected by the optical module to the outside of the head-up display device and further transmitted to the target element to form the first virtual image and the second virtual image. The optical path of the first image beam from the display unit to the position of the first virtual image formed thereon, via the polarization spectroscopy module, is greater than the optical path length of the second image beam from the display unit to the position of the second virtual image formed thereon. The first reflective unit includes a first reflector and a first quarter-wave plate, and the second reflective unit includes a second reflector and a second quarter-wave plate. The first quarter-wave plate is positioned between the first reflector and the polarization spectroscopic layer, and the second quarter-wave plate is positioned between the second reflector and the polarization spectroscopic layer. The display unit has a first effective imaging region and a second effective imaging region arranged adjacent to each other, which generate the first image luminous beam and the second image luminous beam, respectively, and the first virtual image and the second virtual image formed outside the head-up display device show different image content. The first reflector and the second reflector are perpendicular to each other, A head-up display device characterized in that the display unit and the first reflector are parallel to each other.

2. The head-up display device according to claim 1, characterized in that the first polarization direction and the second polarization direction are perpendicular to each other.

3. The head-up display device further includes sensors and a controller. The aforementioned sensor detects the position of the eye, The controller is electrically connected to the sensor and coupled to the optical module. The head-up display device according to claim 1, characterized in that the controller receives a signal from the sensor and adjusts the deflection angle of the free-form surface reflector in accordance with the change in the position of the eye, thereby clearly displaying the first virtual image and the second virtual image.

4. The polarization spectroscopy module is A first region is arranged to receive and emit the first image luminous beam and the second image luminous beam from the display unit, It includes a second region adjacent to the first region, which is arranged such that the first image light beam is incident on it, reflected multiple times, and then emitted back to the first region. The head-up display device according to claim 1, characterized in that the polarization spectral layer is installed between the first region and the second region, transmits the first image light beam having a first polarization direction, and reflects the second image light beam having a second polarization direction.

5. The first reflective unit and the second reflective unit are arranged adjacent to the second region. The first image luminous beam from the display unit passes through the first region and the polarization spectral layer in sequence before entering the second region, and the first image luminous beam then passes through the first quarter-wave plate, is reflected by the first reflector, passes through the first quarter-wave plate, is reflected by the polarization spectral layer, passes through the second quarter-wave plate, is reflected by the second reflector, passes through the second quarter-wave plate, and passes through the polarization spectral layer, and then passes through the first region again to be transmitted to the optical module. The head-up display device according to claim 4, characterized in that the second image luminous beam from the display unit enters the first region, is reflected by the polarization spectral layer, and transmitted to the optical module.

6. The first region includes a first transparent material, and the second region further includes a second transparent material. The polarization spectral layer is arranged on the surface of the second transparent body facing the first transparent body, and is located between the first transparent body and the second transparent body. The head-up display device according to claim 4, characterized in that the contact area between the first light-transmitting body and the polarizing spectral layer is smaller than the total area of ​​the polarizing spectral layer.

7. The head-up display device according to claim 1, characterized in that the orthographic projection range of the first reflector in the display unit is superimposed on the second effective imaging region of the display unit.

8. The first region includes a first transparent material, and the second region further includes a second transparent material. The polarization spectral layer is disposed on the surface of the second transparent body facing the first transparent body or on the surface of the first transparent body facing the second transparent body, and is located between the first transparent body and the second transparent body. The head-up display device according to claim 4, characterized in that the contact area between the first light-transmitting body and the polarizing spectral layer is equal to the total area of ​​the polarizing spectral layer.

9. The polarization spectroscopy module includes a first region and a second region. The first region is located between the display unit and the second region. The head-up display device according to claim 1, characterized in that the polarization spectral layer is installed between the first region and the second region, reflects the first image light beam having a first polarization direction, and transmits the second image light beam having a second polarization direction.

Images