Head-up display device

Abstract

The invention, which relates to the technical field of the vehicle-mounted head-up display, discloses a head-up display device comprising an image generation module and an optical waveguide assembly. The image generation module comprises a first image generation module and a second image generation module, and the optical waveguide assembly comprises a first optical waveguide assembly and a second optical waveguide assembly; the first optical waveguide assembly is located on a light emitting path of the first image generation module, and the second optical waveguide assembly is located on a light emitting path of the second image generation module. According to the head-up display device, the optical waveguide assembly comprises the first optical waveguide assembly and the second optical waveguide assembly, the number of exit pupil times can be reduced, the single exit pupil light efficiency can be improved, and therefore the light efficiency utilization rate is improved, the virtual image brightness is improved, and the watching experience of a user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted head-up display, and in particular to a head-up display device. Background Art

[0002] With the development of the automotive industry, electronic information display systems have gradually become popular, such as head-up display systems (HUD). Usually, the head-up display system uses a reflective virtual image imaging optical path to project an image with a certain virtual image distance on the windshield. Since conventional reflective head-up display systems require a relatively large volume, for example, if an image with a 10*4 degree field of view is required to be displayed, the volume of the head-up display system may be greater than 8L, causing problems in the layout of the head-up display system inside the vehicle dashboard, requiring large-scale avoidance of surrounding structures, limiting the actual application and performance improvement of the head-up display system.

[0003] In order to solve this problem, some head-up display systems no longer use the aspherical reflectors and free-form reflectors included in conventional reflective head-up display systems, but instead use a transmissive imaging method based on an optical waveguide.

[0004] In some transmission imaging technologies, diffraction waveguides play an important role due to their advantages of being thin, light, having a large field of view, and having a large display area. However, in the current diffraction waveguide design, the diffraction efficiency function of the outcoupling grating covers the light of the full field of view, but when the human eye receives an image, it does not receive all the light coupled out by the outcoupling grating, and a large amount of light will be wasted on both sides of the human eye, resulting in a darker outcoupling image brightness and low efficiency in the use of light energy in the current diffraction waveguide display scheme. Therefore, how to improve the brightness of the outcoupling image of the diffraction waveguide is an urgent problem that technicians in this field need to solve. Summary of the invention

[0005] An embodiment of the present invention provides a head-up display device, in which an optical waveguide component includes a first optical waveguide component and a second optical waveguide component, which can reduce the number of pupil exit times and improve the efficiency of a single pupil exit light, thereby improving the light efficiency utilization rate, increasing the brightness of a virtual image, and improving the user's viewing experience.

[0006] In a first aspect, an embodiment of the present invention provides a head-up display device, including an image generation module and an optical waveguide component;

[0007] The image generation module includes a first image generation module and a second image generation module, and the optical waveguide component includes a first optical waveguide component and a second optical waveguide component;

[0008] The first optical waveguide component is located on the light emitting path of the first image generating module, and the second optical waveguide component is located on the light emitting path of the second image generating module.

[0009] Optionally, the first image generation module generates a first image, the second image generation module generates a second image, and the first image is the same as the second image.

[0010] Optionally, the head-up display device further includes a lens group, and the lens group includes a first lens group and a second lens group;

[0011] The first lens group is located between the first image generating module and the first optical waveguide component, and the second lens group is located between the second image generating module and the second optical waveguide component.

[0012] Optionally, the lens group includes multiple spherical lenses.

[0013] Optionally, the first optical waveguide component includes a first array optical waveguide; or includes a first diffraction optical waveguide and a first grating component;

[0014] The second optical waveguide component includes a second array optical waveguide; or, includes a second diffraction optical waveguide and a second grating component.

[0015] Optionally, the first optical waveguide component includes a first diffractive optical waveguide; the second optical waveguide component includes a second diffractive optical waveguide;

[0016] The first diffractive optical waveguide and the second diffractive optical waveguide are in the same plane.

[0017] Optionally, a side surface of the first diffractive optical waveguide is in physical contact with a side surface of the second diffractive optical waveguide.

[0018] Optionally, the first image generation module and the second image generation module both include a backlight module and a liquid crystal display panel; the liquid crystal display panel is located on the light emission path of the backlight module.

[0019] Optionally, the first image generation module and the second image generation module each further include a light adjustment device, and the light adjustment device is located between the backlight module and the liquid crystal display panel.

[0020] Optionally, the backlight module includes:

[0021] A light source generates an illumination beam along a first direction;

[0022] A brightness enhancement component, located on the emission path of the light source, includes a first polarization beam splitter prism, a second polarization beam splitter prism, a third polarization beam splitter prism, a fourth polarization beam splitter prism, a first wave plate, and a second wave plate;

[0023] The first polarization beam splitter prism, the second polarization beam splitter prism, the third polarization beam splitter prism and the fourth polarization beam splitter prism are arranged sequentially along a second direction, and the first direction is different from the second direction; the first wave plate is located on the light exiting surface side of the first polarization beam splitter prism, and the second wave plate is located on the light exiting surface side of the fourth polarization beam splitter prism.

[0024] The head-up display device provided in the embodiment of the present invention includes an image generation module and an optical waveguide component; the image generation module includes a first image generation module and a second image generation module, and the optical waveguide component includes a first optical waveguide component and a second optical waveguide component; the first optical waveguide component is located on the light exit path of the first image generation module, and the second optical waveguide component is located on the light exit path of the second image generation module. The optical waveguide component in the head-up display device in the embodiment of the present invention includes a first optical waveguide component and a second optical waveguide component, which can reduce the number of pupil exits and improve the efficiency of a single pupil exit light, thereby improving the light efficiency utilization rate, improving the brightness of the virtual image, and improving the user's viewing experience.

[0025] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a head-up display device provided by an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of a one-dimensional pupil expansion optical path propagation of an array optical waveguide provided in an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of one-dimensional pupil expansion optical path propagation of a diffractive optical waveguide provided in an embodiment of the present invention;

[0029] Figure 4 A schematic diagram of the structure of another head-up display device provided by an embodiment of the present invention;

[0030] Figure 5 A schematic diagram of a two-dimensional pupil expansion optical path propagation of an array optical waveguide provided in an embodiment of the present invention;

[0031] Figure 6 A schematic diagram of a two-dimensional pupil expansion optical path propagation of a diffractive optical waveguide provided in an embodiment of the present invention;

[0032] Figure 7 A cross-sectional schematic diagram of a first image generation module provided by an embodiment of the present invention;

[0033] Figure 8 A cross-sectional schematic diagram of a backlight module provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0035] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] Figure 1 A schematic diagram of a head-up display device according to an embodiment of the present invention is provided. Figure 1 The head-up display device includes an image generation module 110 and an optical waveguide component 230. The image generation module 110 includes a first image generation module 1101 and a second image generation module 1102. The optical waveguide component 230 includes a first optical waveguide component 2301 and a second optical waveguide component 2302. The first optical waveguide component 2301 is located on the light emitting path of the first image generation module 1101, and the second optical waveguide component 2302 is located on the light emitting path of the second image generation module 1102.

[0038] Among them, the two optical waveguide components 230 are smaller in size than one conventional optical waveguide, with fewer pupil exit times and higher efficiency of single pupil exit light.

[0039] The optical waveguide component 230 in the head-up display device of the embodiment of the present invention includes a first optical waveguide component 2301 and a second optical waveguide component 2302, which can reduce the number of exit pupils and improve the efficiency of a single exit pupil light, thereby improving the light efficiency utilization rate, increasing the brightness of the virtual image, and improving the user's viewing experience.

[0040] Optionally, based on the above embodiment, the first image generating module 1101 generates a first image, the second image generating module 1102 generates a second image, and the first image is the same as the second image.

[0041] The first image generated by the first image generating module 1101 and the second image generated by the second image generating module 1102 are the same, which can ensure that the total observation area remains unchanged.

[0042] Optionally, based on the above embodiment, continue to refer to Figure 1 The head-up display device further includes a lens group 220, which includes a first lens group 2201 and a second lens group 2202. The first lens group 2201 is located between the first image generating module 1101 and the first optical waveguide component 2301, and the second lens group 2202 is located between the second image generating module 1102 and the second optical waveguide component 2302.

[0043] Optionally, based on the above embodiment, the lens group 220 includes a plurality of spherical lenses.

[0044] Among them, the first lens group 2201 and the second lens group 2202 are composed of multiple spherical lenses. The lens group composed of multiple spherical lenses can reduce image distortion, have good imaging effect, and help improve user experience. It can be understood that when the light emitted by the first image generation module 1101 and the second image generation module 1102 is respectively vertically incident on the first optical waveguide component 2301 and the second optical waveguide component 2302, the light can be coupled into the first optical waveguide component 2301 and the second optical waveguide component 2302. If the first lens group 2201 and the second lens group 2202 are not added, since the light output angles of the first image generation module 1101 and the second image generation module 1102 are divergent, the coupling angle requirements of the first optical waveguide component 2301 and the second optical waveguide component 2302 are not met. Therefore, the light emitted from the first image generating module 1101 and the second image generating module 1102 respectively passes through the first lens group 2201 and the second lens group 2202 of the present application, and the propagation angle of the light can be adjusted so that the light is vertically coupled into the first optical waveguide component 2301 and the second optical waveguide component 2302, and the size of the divergence angle can be controlled.

[0045] In some embodiments, the first lens group 2201 and the second lens group 2202 may each include 5 lenses. On the light propagation path of the first image generation module 1101 and the second image generation module 1102, the surface types of the 5 lenses included in the first lens group 2201 and the second lens group 2202 are: plano-convex lens (one side is flat and the other side is convex), convex-concave lens (one side is convex and the other side is concave), biconvex lens, biconcave lens, and biconvex lens. Due to many limiting factors in the specific design, such as structural space limitations, the size of the first lens group 2201 and the second lens group 2202 is limited. In addition, there are material limitations. The existing lenses are generally made of glass materials, and it is difficult to process glass into free-form surfaces. Therefore, considering the above factors, the present application uses multiple spherical lenses. The first lens group 2201 and the second lens group 2202 of the present application both use multiple spherical lenses, which are less difficult to process than free-form surfaces, have lower costs, lower tolerance sensitivity, and stable optical quality.

[0046] Optionally, based on the above embodiment, the first optical waveguide component 2301 of the present invention includes a first array optical waveguide, and the second optical waveguide component 2302 includes a second array optical waveguide. Figure 1 The first optical waveguide component 2301 includes a first diffractive optical waveguide 2311 and a first grating component 5001. The second optical waveguide component includes a second diffractive optical waveguide 2312 and a second grating component 5002.

[0047] Wherein, the first optical waveguide component 2301 and the second optical waveguide component 2302 both include arrayed optical waveguides, or the first optical waveguide component 2301 and the second optical waveguide component 2302 both include diffraction optical waveguides and grating components, which can improve mechanical tolerance, increase the eye movement range through one-dimensional and two-dimensional pupil expansion technology, and thus adapt to more people. Figure 1 Shown in FIG. 1 is one-dimensional pupil expansion using a diffractive optical waveguide.

[0048] For example, Figure 2 A schematic diagram of a one-dimensional pupil expansion optical path propagation of an array optical waveguide provided in an embodiment of the present invention, referring to Figure 2 , taking the case where the incident light is incident vertically on the first surface A1 as an example, the principle of realizing pupil expansion (one-dimensional pupil expansion) in the array waveguide is as follows: the first optical film layer 201, the second optical film layer 202 and the third optical film layer 203 are semi-transmissive film layers, and the fourth optical film layer 204 is a total reflection film layer. Specifically, the incident light is incident vertically on the first surface A1, is reflected by the reflector A3 and enters the waveguide, and is totally reflected and propagated between the first surface A1 and the second surface A2, so that the light can be transmitted along the waveguide component, that is, Figure 2 The x-direction transmission is shown.

[0049] When the light is totally reflected from the first surface A1 to the first optical film layer 201, a part of the light is reflected by the first optical film layer 201, and vertically enters the first surface A1 and emits the reflective array waveguide, and another part of the light is transmitted from the first optical film layer 201, and the transmitted light is totally reflected from the second surface A2 to the first surface A1, and is totally reflected from the first surface A1 to the second optical film layer 202, and then a part of the light is reflected by the second optical film layer 202 and finally emits the reflective array waveguide, and another part of the light is transmitted from the second optical film layer 202. Similarly, when the light is incident on the fourth optical film layer 204, it is completely reflected, and vertically enters the first surface A1 and emits the reflective array waveguide. Therefore, the incident light is reflected and transmitted from the first optical film layer 201 to the fourth optical film layer 204, and finally the light exit pupil expansion in the x direction can be achieved.

[0050] Figure 3 A schematic diagram of a one-dimensional pupil expansion optical path propagation of a diffractive optical waveguide provided in an embodiment of the present invention, referring to Figure 3 , the incident light L0 is coupled into the first waveguide substrate 503 through the first coupling grating 501, and each time the light L1 encounters the first coupling grating 502 on the surface of the first waveguide substrate 503, a portion of the light is coupled out through the diffraction optical waveguide (e.g. Figure 3 The remaining part of the light continues to propagate in the first waveguide substrate 503 until it hits the first outcoupling grating 502 on the surface of the first waveguide substrate 503 next time.

[0051] The first coupling-in grating 501 and the first coupling-out grating 502 may be surface relief gratings (SRGs) or volume holographic gratings (VHGs), and the area of ​​the first coupling-in grating 501 is smaller than the area of ​​the first coupling-out grating 502. The type, position, and size of the first coupling-in grating 501 and the first coupling-out grating 502 may be determined according to requirements.

[0052] Figure 4 A schematic diagram of another head-up display device provided in an embodiment of the present invention, Figure 1 The difference between the one-dimensional pupil expansion using diffractive waveguide shown in Figure 4 The following figure shows two-dimensional pupil expansion using a diffractive waveguide. Figure 4The head-up display device includes the first image generation module 1101, the second image generation module 1102, the first lens group 2201, the second lens group 2202, the first optical waveguide component 2301 and the second optical waveguide component 2302 in the above embodiment of the present invention. The first lens group 2201 is located between the first image generation module 1101 and the first optical waveguide component 2301. The light beam emitted by the first image generation module 1101 is projected to the coupling region of the first optical waveguide component 2301 after passing through the first lens group 2201. The second lens group 2202 is located between the second image generation module 1102 and the second optical waveguide component 2302. The light beam emitted by the second image generation module 1102 is projected to the coupling region of the second optical waveguide component 2302 after passing through the second lens group 2202. The coupling-in region of the first optical waveguide component 2301 and the second optical waveguide component 2302 may be provided with a third coupling-in grating G1, and coupled out in the coupling-out region of the first optical waveguide component 2301 and the second optical waveguide component 2302, and projected onto the windshield 200. Figure 4 The first optical waveguide component 2301 and the second optical waveguide component 2302 in the embodiment both include a diffraction optical waveguide and a grating component. Figure 4 The first optical waveguide component 2301 and the second optical waveguide component 2302 both include a third waveguide substrate 231, a third coupling-in grating G1, a turning grating G2, and a third coupling-out grating G3. The head-up display device of this embodiment realizes two-dimensional pupil expansion technology to increase the eye movement range through diffraction optical waveguide.

[0053] Figure 5 A schematic diagram of a two-dimensional pupil expansion optical path propagation of an array optical waveguide provided in an embodiment of the present invention, with reference to Figure 5The two-dimensional array optical waveguide includes: a second waveguide substrate 900, a second coupling grating 910, a first dimension first exit pupil bezel 921, a first dimension second exit pupil bezel 922, a first dimension third exit pupil bezel 923, a first dimension fourth exit pupil bezel 924, a first dimension fifth exit pupil bezel 925, a second dimension first exit pupil bezel 926, a second dimension second exit pupil bezel 927, a second dimension third exit pupil bezel 928, a second dimension fourth exit pupil bezel 929, and a second dimension fifth exit pupil bezel 9210. The light propagation path is as follows: the light enters the second waveguide substrate 900 through the second coupling grating 910, and realizes the first-dimensional pupil expansion through the first-dimension first exit pupil bezel 921, the first-dimension second exit pupil bezel 922, the first-dimension third exit pupil bezel 923, the first-dimension fourth exit pupil bezel 924, and the first-dimension fifth exit pupil bezel 925; the light partially totally reflected in the waveguide by the first-dimension first exit pupil bezel 921, the first-dimension second exit pupil bezel 922, the first-dimension third exit pupil bezel 923, the first-dimension fourth exit pupil bezel 924, and the first-dimension fifth exit pupil bezel 925 realizes the second-dimensional pupil expansion through the second-dimension first exit pupil bezel 926, the second-dimension second exit pupil bezel 927, the second-dimension third exit pupil bezel 928, the second-dimension fourth exit pupil bezel 929, and the second-dimension fifth exit pupil bezel 9210. Thus, the pupil expansion in two dimensions, i.e., the two-dimensional pupil expansion, is realized.

[0054] Figure 6 A schematic diagram of a two-dimensional pupil expansion optical path propagation of a diffraction optical waveguide provided in an embodiment of the present invention, which is applicable to an embodiment of the present invention Figure 7 Head-up display device in, refer to Figure 6 After the third coupling-in grating G1 couples the diffraction light into the third waveguide substrate 231, it enters the area of ​​a turning grating G2, and the turning grating G2 couples the light out to achieve one-dimensional pupil expansion; the light coupled out of the turning grating G2 enters the third coupling-out grating G3, and the area of ​​the third coupling-out grating G3 is larger than that of the third coupling-in grating G1. The third coupling-out grating G3 couples the light out of the waveguide to achieve two-dimensional pupil expansion.

[0055] Optionally, based on the above embodiment, continue to refer to Figure 1, the first optical waveguide component 2301 includes a first diffraction optical waveguide 2311, and the second optical waveguide component 2302 includes a second diffraction optical waveguide 2312. The first diffraction optical waveguide 2311 and the second diffraction optical waveguide 2312 are in the same plane. The surface of the first diffraction optical waveguide 2311 facing the first image generating module 1101 is coplanar with the surface of the second diffraction optical waveguide 2312 facing the second image generating module 1102. The surface of the first diffraction optical waveguide 2311 away from the first image generating module 1101 is coplanar with the surface of the second diffraction optical waveguide 2312 away from the second image generating module 1102. In the embodiment of the present invention, the first diffraction optical waveguide 2311 and the second diffraction optical waveguide 2312 are in the same plane, which can make the brightness of the out-coupled image uniform and improve the display effect.

[0056] Optionally, based on the above embodiment, continue to refer to Figure 1 , the side surface of the first diffraction optical waveguide 2311 is in physical contact with the side surface of the second diffraction optical waveguide 2312. No gap is set between the first diffraction optical waveguide 2311 and the second diffraction optical waveguide 2312, so that the exit pupil of the first diffraction optical waveguide 2311 is connected with the exit pupil of the second diffraction optical waveguide 2312 to form a continuous exit pupil. In other embodiments, a certain interval can be set between the side surface of the first diffraction optical waveguide 2311 and the side surface of the second diffraction optical waveguide 2312, that is, a gap is set between the first diffraction optical waveguide 2311 and the second diffraction optical waveguide 2312.

[0057] Figure 7 1 is a cross-sectional schematic diagram of a first image generation module provided in an embodiment of the present invention. In the embodiment of the present invention, the first image generation module 1101 and the second image generation module 1102 have the same structure. Figure 7 The first image generating module 1101 includes a backlight module 111 and a liquid crystal display panel 112 , and the liquid crystal display panel 112 is located on the light emitting path of the backlight module 111 .

[0058] It is understandable that the second image generating module 1102 also includes a backlight module 111 and a liquid crystal display panel 112 , and the liquid crystal display panel 112 is located on the light emission path of the backlight module 111 .

[0059] Continue to refer Figure 7 The liquid crystal display panel 112 includes a polarizer 5, a liquid crystal cell 6 and an analyzer 7. The polarization direction of the light emitted by the backlight module 111 is set to be the same as the light transmission axis direction of the polarizer 5. The light transmission axis direction of the analyzer 7 is set to be the same as the light transmission axis direction of the analyzer 7. Figure 1 The polarization directions of the entrance pupil light rays with the maximum exit pupil brightness of the optical waveguide assembly 230 are the same.

[0060] The polarization direction of the light emitted by the brightness enhancement component 2 is the same as the transmission axis direction of the polarizer 5 .

[0061] In the embodiment of the present invention, the polarization direction of the light emitted by the backlight module 111 is the same as the transmission axis direction of the polarizer 5, and the light emitted by the brightness enhancement component 2 can pass through the polarizer 5 without loss, which can reduce energy loss and improve light energy utilization.

[0062] Optionally, based on the above embodiment, continue to refer to Figure 7 The first image generating module 1101 further includes a light adjusting device 4 , and the light adjusting device 4 is located between the backlight module 111 and the liquid crystal display panel 112 .

[0063] It is understandable that the second image generating module 1102 also includes a light adjusting device 4 , and the light adjusting device 4 is located between the backlight module 111 and the liquid crystal display panel 112 .

[0064] Specifically, the light adjustment device 4 may be a convex lens, and the convex lens is located between the backlight module 111 and the polarizer 5 .

[0065] In the embodiment of the present invention, a convex lens is arranged between the backlight module 111 and the liquid crystal display panel 112, which can adjust the propagation direction of the light and have a converging effect on the light, so that the adjusted light can be more closely matched with the light required by the imaging design, which can further reduce energy loss and improve light energy utilization.

[0066] Optionally, based on the above embodiment, continue to refer to Figure 7 The first image generating module 1101 further includes a light homogenizing film 3 , which is located on a side of the brightness enhancing component 2 away from the light source 1 .

[0067] It can be understood that the second image generating module 1102 also includes a light homogenizing film 3 , and the light homogenizing film 3 is located on a side of the brightness enhancing component 2 away from the light source 1 .

[0068] In this embodiment, a uniform light film 3 is provided on the side of the brightness enhancement component 2 away from the light source 1 to correct the light diffusion angle, thereby increasing the light radiation area. After diffusion through the uniform light film 3, the area is larger and the uniformity is better, which can further reduce energy loss and improve light energy utilization.

[0069] Figure 8 A cross-sectional schematic diagram of a backlight module provided by an embodiment of the present invention, referring to Figure 8 The backlight module 111 includes a light source 1 and a brightness enhancement component 2. The light source 1 generates an illumination beam along a first direction Y.

[0070] The brightness enhancement component 2 is located on the light emission path of the light source 1, and the brightness enhancement component 2 includes a first polarization beam splitter prism 21, a second polarization beam splitter prism 22, a third polarization beam splitter prism 23, a fourth polarization beam splitter prism 24, a first wave plate 25, and a second wave plate 26. Among them, the bevels in the second polarization beam splitter prism 22 and the third polarization beam splitter prism 23 are sealed with a beam splitter film, which can transmit P polarized light and reflect S polarized light. The incident natural light can be decomposed into P polarized light and S polarized light with mutually perpendicular polarization directions, referred to as P light and S light, respectively.

[0071] Continue to refer Figure 8 The first polarization beam splitter prism 21, the second polarization beam splitter prism 22, the third polarization beam splitter prism 23 and the fourth polarization beam splitter prism 24 are arranged in sequence along the second direction X, and the first direction Y is different from the second direction X. Exemplarily, the first direction Y is perpendicular to the second direction X. The first wave plate 25 is located on the light exiting surface side of the first polarization beam splitter prism 21, and the second wave plate 26 is located on the light exiting surface side of the fourth polarization beam splitter prism 24.

[0072] It is understandable that, due to the selectivity of polarization direction in the liquid crystal display panel (LCD, Liquid Crystal Display), if the natural light emitted by the light source, the natural light will have half of its energy loss when passing through the polarizer in the liquid crystal display panel. In this embodiment, the illumination light beam generated by the light source 1 along the first direction Y is incident on the inclined surfaces of the second polarization beam splitter prism 22 and the third polarization beam splitter prism 23 and will be divided into P light and S light. Among them, the P light can directly pass through the second polarization beam splitter prism 22 and the third polarization beam splitter prism 23 along the first direction Y. The S light reflected by the inclined surfaces of the second polarization beam splitter prism 22 and the third polarization beam splitter prism 23 will be reflected again by the inclined surfaces of the first polarization beam splitter prism 21 and the fourth polarization beam splitter prism 24, respectively, and pass through the first polarization beam splitter prism 21 and the fourth polarization beam splitter prism 24 along the first direction Y, and then converted into P light by the first wave plate 25 and the second wave plate 26 respectively. The scheme of this embodiment can make the output light of the brightness enhancement component all P light, which can effectively reduce energy loss and improve brightness.

[0073] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A head-up display device, characterized in that: including an image generation module and an optical waveguide assembly; The image generation module includes a first image generation module and a second image generation module, and the optical waveguide component includes a first optical waveguide component and a second optical waveguide component; The first optical waveguide component is located on the light emitting path of the first image generating module, and the second optical waveguide component is located on the light emitting path of the second image generating module.

2. The head-up display device according to claim 1, characterized in that: The first image generation module generates a first image, and the second image generation module generates a second image, and the first image is the same as the second image.

3. The head-up display device according to claim 1, characterized in that: Also included is a lens group, the lens group including a first lens group and a second lens group; The first lens group is located between the first image generating module and the first optical waveguide component, and the second lens group is located between the second image generating module and the second optical waveguide component.

4. The head-up display device according to claim 3, characterized in that: The lens group includes a plurality of spherical lenses.

5. The head-up display device according to claim 1, characterized in that: The first optical waveguide component includes a first array optical waveguide; or includes a first diffraction optical waveguide and a first grating component; The second optical waveguide component includes a second array optical waveguide; or, includes a second diffraction optical waveguide and a second grating component.

6. The head-up display device according to claim 5, characterized in that: The first optical waveguide assembly includes a first diffractive optical waveguide; the second optical waveguide assembly includes a second diffractive optical waveguide; The first diffractive optical waveguide and the second diffractive optical waveguide are in the same plane.

7. The head-up display device according to claim 6, characterized in that: A side surface of the first diffractive light waveguide is in physical contact with a side surface of the second diffractive light waveguide.

8. The head-up display device according to claim 1, characterized in that: The first image generation module and the second image module both include a backlight module and a liquid crystal display panel; the liquid crystal display panel is located on the light emission path of the backlight module.

9. The head-up display device according to claim 8, characterized in that: The first image generation module and the second image generation module each further include a light adjustment device, and the light adjustment device is located between the backlight module and the liquid crystal display panel.

10. The head-up display device according to claim 8, characterized in that: The backlight module comprises: A light source generates an illumination beam along a first direction; A brightness enhancement component, located on the emission path of the light source, includes a first polarization beam splitter prism, a second polarization beam splitter prism, a third polarization beam splitter prism, a fourth polarization beam splitter prism, a first wave plate, and a second wave plate; The first polarization beam splitter prism, the second polarization beam splitter prism, the third polarization beam splitter prism and the fourth polarization beam splitter prism are arranged sequentially along a second direction, and the first direction is different from the second direction; the first wave plate is located on the light exiting surface side of the first polarization beam splitter prism, and the second wave plate is located on the light exiting surface side of the fourth polarization beam splitter prism.

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