Head-up display system, display device, and travel device

Abstract

A kind of head-up display system, display device includes: display unit (1);Light splitting unit (2) is arranged at the light-emitting side of display unit (1), is configured to be able to transmit first linearly polarized light, block second linearly polarized light: light ray emitted by display unit (1) after passing through light splitting unit (2), conversion into first linearly polarized light;Light transmission substrate (4);First imaging unit (3) is arranged on the light path from light splitting unit (2) to light transmission substrate (4), is configured to be able to transmit and reflect first linearly polarized light;Second imaging unit (5) is arranged on the side of light transmission substrate (4) away from first imaging unit (3), is configured to be able to reflect first linearly polarized light that transmits through light transmission substrate (4).It can improve light utilization, reduce energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a head-up display system, a display device and a driving device. BACKGROUND

[0002] With the rapid development of display technology, Hud (Head Up Display, head-up display) system is more and more used in cars. The vehicle-mounted head-up display system can project important driving information such as navigation and driving speed onto the windshield in front of the driver, so that the driver can see the driving information without lowering his head, thereby avoiding distraction of attention to the road ahead.

[0003] However, the head-up display system in the related art has low brightness of the picture projected on the windshield due to the transmission effect of the windshield on the display light, which reduces the display effect of the head-up display system. SUMMARY

[0004] Embodiments of the present application adopt the following technical solutions:

[0005] Embodiments of the present application adopt the following technical solutions:

[0006] In one aspect, the embodiments of the present application provide a head-up display system, comprising:

[0007] a display unit;

[0008] a light splitting unit arranged on the light emitting side of the display unit and configured to be able to transmit first linearly polarized light and block second linearly polarized light; the light emitted by the display unit is converted into the first linearly polarized light after passing through the light splitting unit;

[0009] a light transmission substrate;

[0010] a first imaging unit arranged on the light path from the light splitting unit to the light transmission substrate and configured to be able to transmit and reflect the first linearly polarized light;

[0011] a second imaging unit arranged on the side of the light transmission substrate away from the first imaging unit and configured to be able to reflect the first linearly polarized light transmitted through the light transmission substrate.

[0012] In some embodiments, the first imaging unit comprises a semi-transmissive and semi-reflective film arranged on the light path from the light splitting unit to the light transmission substrate, and the semi-transmissive and semi-reflective film is configured to be able to reflect part of the first linearly polarized light and transmit the remaining part of the first linearly polarized light.

[0013] In some embodiments, the second imaging unit comprises a first reflective polarizer disposed on a side of the light-transmissive substrate away from the first imaging unit and configured to reflect the first linearly polarized light transmitted through the light-transmissive substrate.

[0014] In some embodiments, the second imaging unit comprises a second reflective polarizer and a phase retarder, the second reflective polarizer disposed on a side of the light-transmissive substrate away from the first imaging unit, the phase retarder disposed between the light-transmissive substrate and the second reflective polarizer;

[0015] wherein the phase retarder is configured to convert the first linearly polarized light into a second linearly polarized light on an optical path from the light-transmissive substrate to the second reflective polarizer, and convert the second linearly polarized light into the first linearly polarized light on an optical path from the second reflective polarizer to the light-transmissive substrate;

[0016] the second reflective polarizer is configured to reflect the second linearly polarized light emitted from the phase retarder.

[0017] In some embodiments, the phase retarder comprises a half-wave plate.

[0018] In some embodiments, the phase retarder comprises a half-wave plate and a phase difference compensation film.

[0019] In some embodiments, the light-transmissive substrate comprises a sandwich layer;

[0020] wherein the sandwich layer is configured to change a propagation path between a first surface of the light-transmissive substrate to a second surface of the light-transmissive substrate to reduce reflection of the second surface, and change a propagation path between the second surface to the first surface to make the reflected light of the first imaging unit and the reflected light of the second imaging unit enter the human eye along the same path;

[0021] the first surface is a surface of the light-transmissive substrate away from the second imaging unit, and the second surface is a surface of the light-transmissive substrate away from the first imaging unit.

[0022] In some embodiments, a cross-sectional shape of the sandwich layer along a direction perpendicular to the light-transmissive substrate comprises a wedge shape.

[0023] In some embodiments, the head-up display system further comprises a light-transmissive protective film disposed on a side of the second imaging unit away from the light-transmissive substrate.

[0024] In some embodiments, the second imaging unit is further configured to convert ambient light into a second linearly polarized light on an optical path direction of the ambient light towards the light-transmissive substrate.

[0025] In some embodiments, the second imaging unit comprises a second reflective polarizer and a phase retarder, the second reflective polarizer is further configured to convert the ambient light into the first linearly polarized light, and the phase retarder is further configured to convert the first linearly polarized light into the second linearly polarized light.

[0026] In some embodiments, the first linearly polarized light is P-type polarized light, and the second linearly polarized light is S-type polarized light; or, the first linearly polarized light is S-type polarized light, and the second linearly polarized light is P-type polarized light.

[0027] In some embodiments, the display unit comprises one of an organic light-emitting diode display screen, a micro display screen, a liquid crystal display screen, a digital light processing display screen, and an LCOS display screen.

[0028] Embodiments of the present application provide a display device comprising the head-up display system as described above.

[0029] Embodiments of the present application also provide a driving device comprising the display device as described above.

[0030] In some embodiments, the light-transmitting substrate in the display device comprises a windshield.

[0031] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without any creative labor.

[0033] Figure 1 、 Figure 2a 、 Figure 2b and Figure 3 are structure schematic diagrams of four kinds of head-up display systems provided by embodiments of the present application, respectively;

[0034] Figure 4 is a structure schematic diagram of a head-up display system in related art provided by an embodiment of the present application. DETAILED DESCRIPTION

[0035] With reference to the drawings and the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application.

[0036] Unless otherwise required by context, the term "comprises" in the specification and claims is to be construed as an open, inclusive meaning, i.e. "comprises, but is not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" are intended to mean that the particular feature, structure, material or characteristic being described in connection with the embodiment or example includes at least one embodiment or example of the present application. The illustrative representations of the above terms are not necessarily meant to indicate the same embodiment or example. In addition, the particular features, structures, materials or characteristics described can be included in any suitable way in one or more embodiments or examples.

[0037] In the embodiments of the present application, the same items or similar items with basically the same functions and effects are distinguished by using "first", "second" and the like, only for the purpose of clearly describing the technical solutions of the embodiments of the present application, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features.

[0038] Head-up display, also known as parallel display system, is mostly applied in cars and airplanes. In the related art, head-up display is divided into at least three types according to the optical distance of head-up display, including Combiner-Hud (combiner head-up display), Windscreen-Hud (windscreen head-up display) and AR-Hud (augmented reality head-up display). Among them, Windscreen-Hud (windscreen head-up display) is mainly used to project the speed, navigation and other important driving information to the windshield in front of the driver, so that the driver can see the speed, navigation and other important driving information as much as possible without looking down and turning his head. Specifically, the main principle of windscreen head-up display is to project driving information or flight information and other important information on the windshield in front of the driver. When the driver looks forward through the windshield, he can integrate the scene of the external environment with the display content projected by the head-up display. Since the display content projected by the head-up display can be adjusted at a position infinitely far from the focal length of the human eye, the discomfort caused by the constant adjustment of the focal length of the eye when looking at the scene of the external environment and the display content projected by the head-up display can be avoided.

[0039] However, due to the transmission of the display light by the windshield, the brightness of the picture projected on the windshield is low, which reduces the display effect of the head-up display system.

[0040] Based on this, the embodiment of the present application provides a head-up display system, referring to Figure 1 as shown, comprising:

[0041] a display unit 1;

[0042] The display unit 1 can include a display screen, and here the type of the display screen is not limited, and for example, the display screen can be any one of an LCD (Liquid Crystal Display) display screen, an OLED (Organic Light-Emitting Diode) display screen, a Micro OLED micro display screen, a Mini LED micro display screen, a DLP (Digital Light Processing) display screen, and an LCOS (Liquid Crystal on Silicon) display screen. In addition, the display screen can be a flexible screen or a rigid screen (i.e., a non-flexible screen), and in actual application, it can be selected according to user demand.

[0043] a light splitting unit 2 arranged on the light emitting side of the display unit 1 and configured to be able to transmit first linearly polarized light and block second linearly polarized light; the light emitted by the display unit 1 is converted into first linearly polarized light after passing through the light splitting unit;

[0044] The light emitting side of the display unit 1 refers to the side of the display unit 1 from which the display light is emitted, i.e., the display side. In addition, the polarization vectors of the first linearly polarized light and the second linearly polarized light are different. For example, the first linearly polarized light is P-type polarized light (referred to as P light), and the second linearly polarized light is S-type polarized light (referred to as S light); of course, the first linearly polarized light can also be S-type polarized light, and the second linearly polarized light can also be P-type polarized light. In practice, the former is usually selected.

[0045] The embodiment of the present application takes the first linearly polarized light as P-type polarized light (referred to as P light) and the second linearly polarized light as S-type polarized light (referred to as S light) as an example for description.

[0046] When the light penetrates the surface of an optical element (such as a light splitting mirror) at a non-perpendicular angle, both reflection and transmission characteristics depend on the polarization phenomenon. In this case, the coordinate system used is defined with the plane containing the incident and reflected beams. If the polarization vector of the light is in this plane, it is called P-type polarized light, and if the polarization vector is perpendicular to the plane, it is called S-type polarized light.

[0047] The embodiments of the present application do not limit the manner in which the light-splitting unit 2 blocks the second linearly polarized light. For example, the light-splitting unit 2 can block the second linearly polarized light by reflection or absorption.

[0048] The embodiments of the present application do not limit the specific structure of the light-splitting unit 2. Any structure that can transmit the first linearly polarized light and block the second linearly polarized light is included in the embodiments of the present application. For example, the light-splitting unit 2 can be a polarizer or a polarized half-mirror. The polarizer or the polarized half-mirror can transmit S light and block P light, or the polarizer or the polarized half-mirror can transmit P light and block S light.

[0049] The light-transmitting substrate 4;

[0050] The embodiments of the present application do not limit the specific structure of the light-transmitting substrate 4. For example, the light-transmitting substrate 4 can be a flat glass or a curved glass.

[0051] In actual applications, the structure of the light-transmitting substrate 4 varies when the head-up display system is applied to different scenarios.

[0052] For example, if the head-up display system is applied to the cockpit of a car, an airplane, or other vehicles, the light-transmitting substrate 4 can be a front windshield, and the structure of the light-transmitting substrate 4 can be designed according to the structure of the windshield in the actual vehicle. If the head-up display system is applied to a window, such as a building window or a vehicle window, the light-transmitting substrate 4 can be the glass on the window. Of course, in actual applications, the head-up display system can also be applied to other different scenarios, and the specific structure of the light-transmitting substrate 4 is adjusted according to actual needs.

[0053] The first imaging unit 3 is arranged on the light path from the light-splitting unit 2 to the light-transmitting substrate 4 and is configured to be able to transmit and reflect the first linearly polarized light.

[0054] The second imaging unit 5 is arranged on the side of the light-transmitting substrate 4 away from the first imaging unit 3 and is configured to be able to reflect the first linearly polarized light transmitted through the light-transmitting substrate.

[0055] The embodiments of the present application do not limit the specific structure of the first imaging unit 3 and the second imaging unit 5.

[0056] In an example embodiment, the first imaging unit 3 can include a half-mirror.

[0057] In an example embodiment, the second imaging unit 5 can include a reflective polarizer PBS.

[0058] In the exemplary embodiment, after the light splitting unit 2 converts the display light into P light (in the case of the first linearly polarized light being P light), the first part of the P light is reflected by the first imaging unit 3 to the human eye; the remaining part of the P light transmits through the first imaging unit 3, then passes through the light-transmitting substrate 4 to the surface of the second imaging unit 5, the second imaging unit 5 reflects this part of the P light again, and then the light transmits through the light-transmitting substrate 4 and the first imaging unit 3 in turn and is emitted into the human eye together with the first part of the P light. It should be noted that in actual application, the structure of the light-transmitting substrate 4 can be adjusted so that the remaining part of the P light and the first part of the P light enter the human eye along the same path, thereby avoiding the problem of ghosting and improving the display effect.

[0059] In the exemplary embodiment, after the light splitting unit 2 converts the display light into S light (in the case of the first linearly polarized light being S light), a part of the S light is reflected by the first imaging unit 3 to the human eye, and the remaining part of the S light transmits through the first imaging unit 3, then passes through the light-transmitting substrate 4 to the surface of the second imaging unit 5, the second imaging unit 5 reflects this part of the S light again, and then the light transmits through the light-transmitting substrate 4 and the first imaging unit 3 in turn and is emitted into the human eye together with the first part of the S light. It should be noted that in actual application, the structure of the light-transmitting substrate 4 can be adjusted so that the remaining part of the S light and the first part of the S light enter the human eye along the same path, thereby avoiding the problem of ghosting and improving the display effect.

[0060] The embodiment of the present application provides a head-up display system, comprising: a display unit 1; a light splitting unit 2 arranged on the light-emitting side of the display unit 1 and configured to be able to transmit first linearly polarized light and block second linearly polarized light; light emitted by the display unit 1 is converted into first linearly polarized light after passing through the light splitting unit 2; a light-transmitting substrate 4; a first imaging unit 3 arranged on the light path from the light splitting unit 2 to the light-transmitting substrate 4 and configured to be able to transmit and reflect first linearly polarized light; and a second imaging unit 5 arranged on the side of the light-transmitting substrate 4 away from the first imaging unit 3 and configured to be able to reflect first linearly polarized light that transmits through the light-transmitting substrate 4.

[0061] In the head-up display system, through the joint action of the first imaging unit 3 and the second imaging unit 5, as many display light rays as possible can be reflected into the human eye, on the one hand, the light utilization rate of the head-up display system is improved, and the energy consumption is reduced; on the other hand, the brightness of the display image projected on the light-transmitting substrate 4 is improved, the display effect is improved, and the user can watch more conveniently; on the other hand, after the brightness of the display image projected on the light-transmitting substrate 4 is improved, the contrast between the display image on the light-transmitting substrate 4 and the external environment scene can be improved, thereby avoiding the problem that the display image content and the external environment scene are fused together and difficult to identify.

[0062] In some embodiments, referenceFigure 2a As shown, the first imaging unit 3 includes a semi-transmissive and semi-reflective film 31, which is arranged on the light path from the light splitting unit 2 to the light-transmissive substrate 4 and is configured to reflect part of the first linearly polarized light and transmit the remaining first linearly polarized light.

[0063] In exemplary embodiments, the semi-transmissive and semi-reflective film 31 has a transmittance and reflectance ratio of 50:50, or 30:70, or 40:60; of course, other ratios are also possible and can be determined according to actual conditions.

[0064] In actual applications, after the display light is converted into the first linearly polarized light by the light splitting unit 2, the first linearly polarized light is incident on the surface of the semi-transmissive and semi-reflective film 31, part of the first linearly polarized light is reflected by the semi-transmissive and semi-reflective film 31 and enters the human eye, and the remaining first linearly polarized light is transmitted through the semi-transmissive and semi-reflective film 31 and enters the light-transmissive substrate 41. Since the semi-transmissive and semi-reflective film 31 is usually coated on the first surface 412 of the light-transmissive substrate 4 (windshield 41), the light reflection effect of the first surface 412 of the light-transmissive substrate 4 under the action of the semi-transmissive and semi-reflective film 31 is very weak and can be ignored.

[0065] In some embodiments, referring to Figure 2a As shown, the second imaging unit 5 includes a first reflective polarizer 52, which is arranged on the side of the light-transmissive substrate 4 away from the first imaging unit 3 and is configured to reflect the first linearly polarized light transmitted through the light-transmissive substrate 4.

[0066] In actual applications, when the first linearly polarized light transmitted through the semi-transmissive and semi-reflective film 31 is incident on the first reflective polarizer 52 through the light-transmissive substrate 4, the first reflective polarizer 52 reflects the part of the first linearly polarized light back into the light-transmissive substrate 4, and the first linearly polarized light is emitted out of the semi-transmissive and semi-reflective film 31 and enters the human eye again, so that more display light projected on the light-transmissive substrate 4 enters the human eye, thereby improving the brightness of the display image projected on the light-transmissive substrate 4.

[0067] It should be noted that the first reflective polarizer 52 is also usually coated on the surface of the light-transmissive substrate 4 away from the semi-transmissive and semi-reflective film 31, so when the light (first linearly polarized light) is reflected from the first reflective polarizer 52 back into the light-transmissive substrate 4, the interface between the light-transmissive substrate 4 and the first reflective polarizer 52 has little effect on the light path and can be ignored.

[0068] In some embodiments, referring to Figure 2b As shown, the second imaging unit 5 includes a second reflective polarizer 53 and a phase delay film 51, the second reflective polarizer 53 is arranged on the side of the light-transmissive substrate 4 away from the first imaging unit 3, and the phase delay film 51 is arranged between the light-transmissive substrate 4 and the second reflective polarizer 53.

[0069] The phase delay sheet 51 is configured to convert the first linearly polarized light into the second linearly polarized light on the light path from the light-transmitting substrate 4 to the second reflective polarizer 53, and convert the second linearly polarized light into the first linearly polarized light on the light path from the second reflective polarizer 53 to the light-transmitting substrate 4; and the second reflective polarizer 53 is configured to reflect the second linearly polarized light emitted from the phase delay sheet 51.

[0070] In an exemplary embodiment, the first reflective polarizer 52 and the second reflective polarizer 53 are made of the same material, for example, both are made of a polymer material.

[0071] In some embodiments, referring to FIG. 2, the second imaging unit 5 is further configured to convert the ambient light into the second linearly polarized light on the light path direction of the ambient light towards the light-transmitting substrate 4. Figure 2b

[0072] In an exemplary embodiment, the second reflective polarizer 53 is further configured to convert the ambient light into the first linearly polarized light, and the phase delay sheet 51 is further configured to convert the first linearly polarized light into the second linearly polarized light.

[0073] In actual application, after the display light is converted into the first linearly polarized light by the light-splitting unit 2, the first linearly polarized light is incident on the surface of the half-mirror 31, a first part of the first linearly polarized light is reflected by the half-mirror 31 and then enters the human eye, and the remaining part of the first linearly polarized light passes through the light-transmitting substrate 41 and then enters the phase delay sheet 51, the phase delay sheet 51 converts the first linearly polarized light into the second linearly polarized light, and then the second linearly polarized light is emitted onto the second reflective polarizer 53, the second reflective polarizer 53 reflects the second linearly polarized light emitted from the phase delay sheet 51 back into the phase delay sheet 51, the phase delay sheet 51 converts the second linearly polarized light into the first linearly polarized light again, and then the first linearly polarized light is emitted into the human eye through the half-mirror 31, so that more display light projected on the light-transmitting substrate 4 enters the human eye, the light utilization rate is improved, the power consumption of the head-up display system is reduced, the brightness of the display image projected on the light-transmitting substrate 4 is improved, and the display effect is improved.

[0074] In addition, the ambient light outside the head-up display system also enters the human eye in sequence through the second imaging unit 5, the light-transmitting substrate 4, and the first imaging unit 3.

[0075] In an exemplary embodiment, referring to FIG. 2, the ambient light is converted into the first linearly polarized light after passing through the second reflective polarizer 53, the first linearly polarized light is converted into the second linearly polarized light after passing through the phase delay sheet 51, and then the second linearly polarized light enters the human eye in sequence after passing through the light-transmitting substrate 4 and the half-mirror 31 together with the display light converted into the first linearly polarized light. Figure 2b

[0076] ​​In the exemplary embodiments, the ambient light is converted into P light after passing through the second reflective polarizer 53, and the part of the P light is converted into S light after passing through the phase delay sheet 51, and the S light passes through the transparent substrate 4 and the semi-transmissive and semi-reflective film 31 in sequence and enters the human eye together with the display light converted into P light.

[0077] In the exemplary embodiments, the display light can be converted into P light and then reflected to enter the human eye, and the ambient light can be converted into P light and then enter the human eye; or the display light can be converted into S light and then reflected to enter the human eye, and the ambient light can be converted into S light and then enter the human eye; or the display light can be converted into P light and then reflected to enter the human eye, and the ambient light can be converted into S light and then enter the human eye; or the display light can be converted into S light and then reflected to enter the human eye, and the ambient light can be converted into P light and then enter the human eye. The specific determination can be made according to the actual situation, which is not limited here.

[0078] In this way, the user can simultaneously see the external environment scene and the display picture transmitted on the transparent substrate 4, and the user experience is improved. In addition, since the display picture projected on the transparent substrate 4 has high brightness, the display picture on the transparent substrate 4 has a certain contrast with the external environment scene, thereby avoiding the problem that the display picture content and the external environment scene are fused together and difficult to identify.

[0079] In some embodiments, the phase delay sheet 51 includes a half-wave plate.

[0080] The above-mentioned half-wave plate (also known as λ / 2 wave plate, one-half wave plate) refers to a birefringent crystal with a certain thickness. When the normally incident light is transmitted, the phase difference between the ordinary light and the extraordinary light is equal to π or its odd multiple. The one-half wave plate can rotate the polarized light. When linearly polarized light is normally incident on the half-wave plate, the transmitted light is still linearly polarized light. The P-type polarized light is converted into S-type polarized light after passing through the one-half wave plate; conversely, the S-type polarized light is converted into P-type polarized light after passing through the one-half wave plate.

[0081] In some embodiments, the phase delay sheet includes a half-wave plate and a phase difference compensation film.

[0082] The above-mentioned phase difference compensation film eliminates the blue-violet light and yellow-green light on the display screen by compensating for the difference in light transmission speed, so that the black and white display is more distinct.

[0083] In the embodiments of the present application, by arranging the phase difference compensation film, the display effect of the display unit 1 can be improved, and the display effect of the head-up display system composed of the display unit 1 can be improved.

[0084] In some embodiments, the transparent substrate 4 includes a windshield 41.

[0085] In some embodiments, with reference to Figure 2bAs shown, the light-transmitting substrate 4 (windshield 41) comprises a sandwich layer 413; wherein the sandwich layer 413 is configured to change the light path of the light between the first surface 412 of the light-transmitting substrate 4 (windshield 41) and the second surface 411 of the light-transmitting substrate 4 (windshield 41) to reduce the reflection of the second surface 411, and to change the light path of the light between the second surface and the first surface to make the reflected light of the first imaging unit and the reflected light of the second imaging unit enter the human eye along the same path; the first surface 412 is the surface of the light-transmitting substrate away from the second imaging unit 5, and the second surface 411 is the surface of the light-transmitting substrate away from the first imaging unit 3.

[0086] In some embodiments, the cross-sectional shape of the sandwich layer 413 along the direction perpendicular to the light-transmitting substrate 4 comprises a wedge shape.

[0087] For example, the thickness of the sandwich layer 413 can be as shown in the upper thick and lower thin, or as shown in the upper thin and lower thick, which can be determined according to actual conditions. Figure 3 Figure 2b For example, the thickness of the sandwich layer 413 can be as shown in the upper thick and lower thin, or as shown in the upper thin and lower thick, which can be determined according to actual conditions.

[0088] For example, the thickness of the sandwich layer 413 can be in the range of 1mm-5mm.

[0089] For example, the material of the sandwich layer 413 can be a high-molecular light-transmitting material, or an inorganic oxide light-transmitting material, or glass.

[0090] In actual application, after the display light passes through the light splitting unit 2 and is converted into first linearly polarized light, the first linearly polarized light is incident on the surface of the semi-transmissive and semi-reflective film 31, a first part of the first linearly polarized light is reflected by the semi-transmissive and semi-reflective film 31 and enters the human eye, and the remaining part of the first linearly polarized light enters the semi-transmissive and semi-reflective film 31. When the first linearly polarized light that passes through the semi-transmissive and semi-reflective film 31 passes through the first surface 412, the sandwich layer 413, the second surface 411, and the phase retardation sheet 51, the phase retardation sheet 51 converts the part of the first linearly polarized light into second linearly polarized light and reflects the part of the second linearly polarized light on the first reflective polarizer 52, and the phase retardation sheet 51 converts the second linearly polarized light into first linearly polarized light. After the part of the first linearly polarized light passes through the second surface 411 and the sandwich layer 413, the sandwich layer 413 changes the propagation path of the part of the first linearly polarized light, so that the propagation path of the part of the first linearly polarized light from the first surface 412 through the semi-transmissive and semi-reflective film 31 into the human eye is the same as the propagation path of the first part of the first linearly polarized light into the human eye, thereby avoiding the problem of ghosting and improving the display effect.

[0091] It should be noted that in the related art, reference is made to Figure 4 ​As shown, when the display light is transmitted to the windshield, due to the thickness of the windshield, the inner surface 101 and the outer surface 102 of the windshield respectively reflect the display light, so that the paths of the two reflected light beams entering the human eye are different, thereby causing the ghosting problem. The embodiment of the present application effectively adjusts the propagation paths of the two reflected light beams by arranging the interlayer 413 in the light-transmitting substrate 4, thereby avoiding the ghosting problem and improving the display effect.

[0092] In some embodiments, with reference to Figure 3 As shown, the head-up display system further comprises a light-transmitting protective film 7, which is located on the side of the second imaging unit 5 away from the light-transmitting substrate 4.

[0093] For example, the light-transmitting protective film 7 can be a tempered film.

[0094] In some embodiments, in order to ensure that the user can clearly see the scene of the external environment through the first imaging unit 3, the light-transmitting substrate 4 and the second imaging unit 5, the transmittance of the first imaging unit 3, the light-transmitting substrate 4 and the second imaging unit 5 arranged in layers is required to be greater than 50%, 70%, 75%, 80% or 85%. The specific transmittance requirement can be determined according to the actual use scene, which is not limited here.

[0095] For example, when the light-transmitting substrate 4 is the front windshield of a car, the transmittance of the first imaging unit 3, the light-transmitting substrate 4 and the second imaging unit 5 arranged in layers cannot be lower than 70%.

[0096] When the light-transmitting substrate 4 is the side windshield or the rear windshield of a car, the transmittance of the first imaging unit 3, the light-transmitting substrate 4 and the second imaging unit 5 arranged in layers cannot be lower than 50%.

[0097] In some embodiments, the first linearly polarized light is P-type polarized light, and the second linearly polarized light is S-type polarized light; or the first linearly polarized light is S-type polarized light, and the second linearly polarized light is P-type polarized light.

[0098] In some embodiments, the display unit comprises one of an organic light-emitting diode display screen, a micro display screen, a liquid crystal display screen, a digital light processing projection device and an LCOS display screen. In addition, the display screen can be a flexible screen or a rigid screen (i.e. a non-flexible screen). In actual application, it can be selected according to user demand.

[0099] The embodiment of the present application provides a display device comprising the head-up display system as described above.

[0100] The display device provided by the embodiment of the present application can reflect as many display light rays as possible into the human eye through the joint action of the first imaging unit 3 and the second imaging unit 5, on the one hand, improves the light utilization rate of the head-up display system and reduces energy consumption, on the other hand, improves the brightness of the display picture projected on the light-transmitting substrate 4, improves the display effect, and then facilitates the user to watch, and on the other hand, after the brightness of the display picture projected on the light-transmitting substrate 4 is improved, the contrast between the display picture on the light-transmitting substrate 4 and the external environment scene can be improved, and the problem that the display picture content and the external environment scene are fused together and difficult to identify can be avoided.

[0101] In addition, through the display device, the text or image in the display unit can be projected at a distance far away from the focal length of the human eye, so that the user can easily fuse the external environment scene and the display picture, and avoid the information delay and discomfort caused by the continuous adjustment of the focal length of the user's eyes. Of course, the focal length of the text or image projected in the display unit can also be adjusted according to the actual design, which is not limited here.

[0102] The embodiment of the present application provides a driving device comprising the display device as described above.

[0103] For example, the driving device includes but is not limited to a car, an airplane, a ship, a train, a subway, a high-speed rail, etc.

[0104] In some embodiments, the light-transmitting substrate 4 in the display device comprises a windshield.

[0105] For example, the windshield can be a front windshield, a side windshield or a rear windshield.

[0106] In an exemplary embodiment, the display unit in the display device can be located in the area below the steering wheel of the driving device, can be worn on the head of the user, or can also be arranged at other positions of the cockpit, which can be adjusted according to the actual situation.

[0107] The driving device provided by the embodiment of the present application can reflect as many display light rays as possible into the human eye through the joint action of the first imaging unit 3 and the second imaging unit 5, on the one hand, improves the light utilization rate of the head-up display system and reduces energy consumption, on the other hand, improves the brightness of the display picture projected on the light-transmitting substrate 4, improves the display effect, and then facilitates the user to watch, and on the other hand, after the brightness of the display picture projected on the light-transmitting substrate 4 is improved, the contrast between the display picture on the light-transmitting substrate 4 and the external environment scene can be improved, and the problem that the display picture content and the external environment scene are fused together and difficult to identify can be avoided.

[0108] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A head-up display system, wherein, The head-up display system comprises: a display unit; a light splitting unit arranged on the light emitting side of the display unit and configured to transmit first linearly polarized light and block second linearly polarized light; light emitted by the display unit is converted into the first linearly polarized light after passing through the light splitting unit; a light transmission substrate; a first imaging unit arranged on the light path from the light splitting unit to the light transmission substrate and configured to transmit and reflect the first linearly polarized light; a second imaging unit arranged on the side of the light transmission substrate away from the first imaging unit and configured to reflect the first linearly polarized light transmitted through the light transmission substrate; wherein the first imaging unit comprises a semi-transmissive and semi-reflective film, the second imaging unit comprises a first reflective polarizer, a second reflective polarizer and a phase delay film, the semi-transmissive and semi-reflective film is coated on the first surface of the light transmission substrate away from the first reflective polarizer, the first reflective polarizer is coated on the second surface of the light transmission substrate away from the semi-transmissive and semi-reflective film, the second reflective polarizer is arranged on the side of the light transmission substrate away from the first imaging unit, and the phase delay film is arranged between the light transmission substrate and the second reflective polarizer; the phase delay film is configured to convert the first linearly polarized light into second linearly polarized light on the light path from the light transmission substrate to the second reflective polarizer, and convert the second linearly polarized light into the first linearly polarized light on the light path from the second reflective polarizer to the light transmission substrate; the second reflective polarizer is configured to reflect the second linearly polarized light emitted from the phase delay film.

2. The head-up display system of claim 1, wherein, The semi-transmissive and semi-reflective film is arranged on the light path from the light splitting unit to the light transmission substrate, and is configured to reflect part of the first linearly polarized light and transmit the remaining part of the first linearly polarized light.

3. The heads-up display system of claim 1, wherein, The first reflective polarizer is arranged on the side of the light transmission substrate away from the first imaging unit, and is configured to reflect the first linearly polarized light transmitted through the light transmission substrate.

4. The heads-up display system of claim 1, wherein, The phase delay film comprises a half-wave plate.

5. The heads-up display system of claim 1, wherein, The phase delay film comprises a half-wave plate and a phase difference compensation film.

6. The heads-up display system of claim 1, wherein, The light transmission substrate comprises a sandwich layer; wherein the sandwich layer is configured to change the propagation path of light between the first surface of the light transmission substrate and the second surface of the light transmission substrate to reduce the reflection of the second surface, and to change the propagation path between the second surface and the first surface to make the reflected light of the first imaging unit and the reflected light of the second imaging unit enter the human eye along the same path.

7. The head-up display system of claim 6, wherein, The cross-sectional shape of the sandwich layer in the direction perpendicular to the light transmission substrate comprises a wedge shape.

8. The heads-up display system of claim 1, wherein, The head-up display system further comprises a light transmission protective film arranged on the side of the second imaging unit away from the light transmission substrate.

9. The heads-up display system of claim 1, wherein, In the direction of the light path of the ambient light towards the light transmission substrate, the second imaging unit is further configured to convert the ambient light into second linearly polarized light.

10. The head-up display system of claim 9, wherein, The second imaging unit further comprises a second reflective polarizer, which is further configured to convert the ambient light into the first linearly polarized light, and the phase delay film is further configured to convert the first linearly polarized light into the second linearly polarized light. The second imaging unit further comprises a second reflective polarizer, which is further configured to convert the ambient light into the first linearly polarized light, and the phase delay film is further configured to convert the first linearly polarized light into the second linearly polarized light.

11. The heads-up display system of any one of claims 1-10, wherein, The first linearly polarized light is P-type polarized light, and the second linearly polarized light is S-type polarized light; or the first linearly polarized light is S-type polarized light, and the second linearly polarized light is P-type polarized light.

12. The head-up display system of claim 11, wherein, The display unit comprises one of an organic light-emitting diode display screen, a MiniLED micro display screen, a liquid crystal display screen, a digital light processing display screen and an LCOS display screen.

13. A display device, wherein, A heads-up display system comprising any of claims 1-12.

14. A traveling device, wherein, A display device as claimed in claim 13.

15. The travel device of claim 14, wherein, The light-transmitting substrate in the display device comprises a windshield. The light-transmitting substrate in the display device comprises a windshield.

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