CN116224595A - Head-up display system and vehicle - Google Patents

Abstract

The invention relates to a head-up display system and a vehicle. The head-up display system of the present invention includes: the projection unit comprises a display screen, and a first linear polarizer is arranged on the light emergent surface of the display screen; the second linear polarizer is arranged opposite to the first linear polarizer, and the transmission axis of the second linear polarizer is parallel to the transmission axis of the first linear polarizer; and a first functional film configured as a birefringent film and located between the first linear polarizer and the second linear polarizer; the first functional film is used for converting light rays which are emitted by the display screen and pass through the first linear polarizer and are outside a preset visual angle range into elliptical polarized light; and is used for enabling the light rays within the preset visual angle range to transmit through the first light rays unchanged in the polarization direction. The head-up display system and the vehicle can avoid stray light outside the visual angle range of the head-up display system and improve the comfort of a user.

Description

Head-up display system and vehicle

Technical Field

The invention relates to the technical field of vehicles, in particular to a head-up display system and a vehicle.

Background

Head-up display systems, also known as heads-up display systems, are currently commonly used in aircraft flight aids, and as technology advances, they are now becoming increasingly popular in automobiles. The head-up display system aims at improving the safety of the automobile, enabling drivers to concentrate on the road surface and reducing accidents. In the head-up display system of the related art, a light beam emitted from a projector is subjected to a series of reflections, and is transmitted to a reflective screen, for example, a display area of a front windshield, and reflected to finally enter human eyes. However, in the head-up display system of the related art, excessive stray light outside the display viewing angle range often occurs, which affects the use experience of the user.

Disclosure of Invention

Accordingly, it is necessary to provide a head-up display system and a vehicle capable of avoiding stray light outside the viewing angle range of the head-up display system and improving the feeling of use experience of the user.

A first aspect of an embodiment of the present application provides a heads-up display system, including:

the projection unit comprises a display screen, and a first linear polarizer is arranged on the light emergent surface of the display screen;

the second linear polarizer is arranged opposite to the first linear polarizer, and the transmission axis of the second linear polarizer is parallel to the transmission axis of the first linear polarizer; and

a first functional film configured as a birefringent film and located between the first linear polarizer and the second linear polarizer; the first functional film is used for converting light rays which are emitted by the display screen and pass through the first linear polarizer and are outside a preset visual angle range into elliptical polarized light; and is used for enabling the light rays within the preset visual angle range to transmit through the first light rays unchanged in the polarization direction.

In the above-described aspect, the first functional film as the birefringent film is provided between the first linear polarizer and the second linear polarizer by providing the first linear polarizer and the second linear polarizer which are arranged to be opposite to each other with the transmission axes parallel to each other. Therefore, after passing through the first linear polarizer, the light emitted by the display screen is converted into linear polarized light polarized along a certain direction, namely first light, and after passing through the first functional film, the light outside a preset visual angle range is converted into elliptical polarized light, and the light within the preset visual angle range is transmitted unchanged in the polarization direction. In other words, in the first light, linearly polarized light having a larger viewing angle range is converted into elliptically polarized light, and filtered out or the brightness is greatly weakened while passing through the second polarizing plate; the linearly polarized light with a smaller visual angle range keeps the polarization direction unchanged to pass through the first functional film and the second polaroid, and finally enters human eyes after being reflected by at least one reflecting mirror. Among the light rays emitted from the display screen, the light rays with a larger visual angle range (the light rays which are outside the preset visual angle range in the first light rays) are filtered out by the first polaroid, the first functional film and the second polaroid in a matched mode or the brightness is greatly weakened, and the light rays can not or seldom enter human eyes, so that redundant stray light of a head-up display system caused by the existence of the light rays is effectively reduced.

In one embodiment, the film thickness of the first functional film is positively correlated with the predetermined viewing angle range. Thus, when the thickness of the first functional film is large, the effect of eliminating stray light is good.

In one embodiment, the extraordinary ray axis of the first functional film is parallel to the light exit direction of the display screen. Therefore, the visual angles of left and right eyes of an image seen by the eyes of a person can be ensured to be symmetrical, and the imaging effect is better.

In one embodiment, the first functional film is disposed on a side surface of the first linear polarizer facing the second linear polarizer. In this way, a simpler mounting of the first functional film is facilitated.

In one embodiment, the head-up display system further includes a first optical lens located on a side of the first functional film facing away from the first linear polarizer, and the second linear polarizer is disposed on a surface of the first optical lens facing the first functional film and spaced apart from the first functional film by a predetermined distance. Through setting up this preset interval, can make first optical lens piece and second polaroid play thermal-insulated effect, also minimize the heat transfer on the first functional film to the second polaroid on, influence the normal work of the device that is located the low reaches in the light propagation route, for example speculum etc..

In one embodiment, the first optical lens is configured as a hot mirror. Therefore, sunlight entering the head-up display system can be reduced, and the problem that the projection unit is damaged due to the fact that sunlight in the use environment flows back onto the projection unit is avoided.

In one embodiment, the heads-up display system further comprises a reflective screen and at least one mirror for reflecting light rays exiting the second linear polarizer to the reflective screen.

In one embodiment, the mirror comprises a planar mirror and a curved mirror;

the plane reflector is used for reflecting the light rays emitted by the second linear polarizer to the curved reflector, and the curved reflector is used for reflecting the light rays reflected by the plane reflector to the reflecting screen. The image distance and the visual size can be enlarged by using the curved reflector.

In one embodiment, the projection unit includes a backlight module, the display screen is configured as a liquid crystal display screen, and the backlight module is disposed on a side of the display screen facing away from the first linear polarizer.

A second aspect of the embodiments of the present application provides a vehicle including the head-up display system described above.

Drawings

Fig. 1 is a schematic diagram of an overall structure of a head-up display system according to an embodiment of the present application;

fig. 2 is a schematic light path diagram of a head-up display system according to an embodiment of the present disclosure;

fig. 3 is an equivalent structural schematic diagram of a head-up display system according to an embodiment of the present application;

FIG. 4 is a graph showing the relative relationship between brightness and viewing angle of light rays of a head-up display system according to an embodiment of the present disclosure and a related art;

fig. 5 is an equivalent structural schematic diagram of another structure of a head-up display system according to an embodiment of the present application.

Reference numerals illustrate:

100. a heads-up display system;

10. a first linear polarizer; 20. a second linear polarizer;

30. a projection unit; 31. a display screen;

40. a first optical lens;

50. a first functional film;

61. a planar mirror; 62. a curved mirror;

70. a front windshield.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Head-up display systems are flight assistance systems that were early applied on board aircraft. With the development of science and technology, head-up display systems are increasingly used in automobiles. The head-up display system on the automobile can display important driving information such as speed, engine revolution, oil consumption, tire pressure, navigation and information of external intelligent equipment in the field of view of a driver on the front windshield in real time, so that the driver can see the driving information without lowering the head, the distraction to the front road is avoided, and potential driving hidden danger is eliminated.

The head-up display system of the related art may generally include a projector, a main control module, at least one mirror, and the like, and the light emitted from the projector may appropriately display an image in front of a windshield through the mirror, for a user to view.

In view of uniformity of imaging in the display area of the front windshield, the viewing angle of the outgoing light of the display screen of the projector is generally set to be large, which may cause excessive stray light outside the range of the viewing angle of the display area of the front windshield (i.e., the viewing angle of the head-up display system), which seriously reduces the user's sense of use experience.

The utility model provides a based on above-mentioned problem, through setting up first functional film and second linear polarizer in the light-emitting side of projection unit, first functional film can be with the light conversion of great visual angle in the light of the emergence of projecting apparatus into elliptical polarized light, this elliptical polarized light is after the second polaroid, is filtered or luminance is weakened by the second polaroid greatly, finally can not or very little reentrant people's eye in, effectively solved the stray light outside the visual angle scope of head-up display system.

The head-up display system and the vehicle according to the embodiments of the present application are described below with reference to the drawings.

Fig. 1 is a schematic overall structure of a head-up display system provided in an embodiment of the present application, fig. 2 is a schematic optical path of the head-up display system provided in an embodiment of the present application, and fig. 3 is a schematic equivalent structure of the head-up display system provided in an embodiment of the present application.

Referring to fig. 1, 2 and 3, a head-up display system 100 provided in an embodiment of the present application includes a projection unit 30, a second linear polarizer 20 and a first functional film 50, where the projection unit 30 includes a display screen 31, and further includes a first linear polarizer 10, and the first linear polarizer 10 is disposed on a light emitting surface of the display screen 31. The second linear polarizer 20 is disposed opposite to the first linear polarizer 10, and a transmission axis of the second linear polarizer 20 is parallel to a transmission axis of the first linear polarizer 10. The first functional film 50 is configured as a birefringent film and is located between the first linear polarizer 10 and the second linear polarizer 20.

The first functional film 50 is used for converting light rays which are outside a preset viewing angle range from first light rays which are emitted from the display screen 31 and pass through the first linear polarizer 10 into elliptical polarized light; and is used for enabling the light rays within the preset visual angle range to transmit through the first light rays unchanged in the polarization direction.

In the above-described configuration, the first functional film 50 of the birefringent film is provided between the first linear polarizer 10 and the second linear polarizer 20 by providing the first linear polarizer 10 and the second linear polarizer 20 which are arranged with the transmission axes parallel to each other and facing each other. Thus, the light emitted from the display screen 31 is converted into linearly polarized light polarized in a certain direction after passing through the first linear polarizer 10, that is, the first light, and the light outside the predetermined viewing angle range is converted into elliptical polarized light after passing through the first functional film 50, and the light within the predetermined viewing angle range is transmitted with the polarization direction unchanged. In other words, in the first light, linearly polarized light having a larger viewing angle range is converted into elliptically polarized light and filtered out while passing through the second linear polarizer 20; while linearly polarized light having a smaller viewing angle range is transmitted through the first functional film 50 and the second linear polarizer 20 with its polarization direction unchanged, and finally enters the human eye after being reflected by at least one mirror. Of the light rays emitted from the display screen 31, the light rays with a larger viewing angle range (the light rays outside the preset viewing angle range of the first light rays) are filtered out by the first linear polarizer 10, the first functional film 50 and the second linear polarizer 20 in a matched manner, or even if the light rays are not completely filtered out, the brightness of the light rays is greatly reduced, and the light rays cannot enter human eyes or seldom enter human eyes, so that stray light of a head-up display system caused by the existence of the light rays is effectively reduced.

In one possible implementation, the display screen 31 may be a liquid crystal display screen, where the display screen 31 is a liquid crystal display screen, the projection unit 30 may further include a backlight module (not shown) disposed on a side of the display screen 31 facing away from the first linear polarizer 10, for providing a light source for the liquid crystal display screen 31.

In addition, in the embodiment of the present application, the first linear polarizer 10 and the second linear polarizer 20 are disposed opposite to each other, which means that the first linear polarizer 10 and the second linear polarizer 20 are disposed opposite to each other, and the first linear polarizer 10 and the second linear polarizer 20 may be disposed in parallel, and the first functional film 50 is located between the first linear polarizer 10 and the second linear polarizer 20, so that light emitted from the display screen 31 may be ensured to be emitted after passing through the first linear polarizer 10, the first functional film 50 and the second linear polarizer 20. Illustratively, both the first linear polarizer 10 and the second linear polarizer 20 may be configured as polarizers.

The fact that the transmission axis of the second linear polarizer 20 is parallel to the transmission axis of the first linear polarizer 10 means that the polarization directions of the second linear polarizer 20 and the first linear polarizer 10 are parallel. The light exiting through the display 31 becomes linearly polarized light, i.e., the first light after passing through the first linear polarizer 10.

In this embodiment, the light ray outside the preset viewing angle range of the first light ray may be converted into elliptical polarized light after passing through the first functional film 50 layer.

In addition, the first functional film 50 is configured as a birefringent film layer, which means that the first functional film 50 is a birefringent medium capable of birefringent the first light rays emitted from the display screen 31 and passing through the first polarizer 10.

Fig. 4 is a graph showing the relative relationship between brightness and viewing angle of light rays of the head-up display system 100 according to the embodiment of the present application and the related art.

Referring to fig. 4, a graph of the relative relationship between the brightness of the light of the head-up display system 100 and the viewing angle of the head-up display system 100 provided in the embodiment of the present application is illustrated by a graph of a solid line, and a graph of the relative relationship between the brightness of the light of the head-up display system 100 and the viewing angle of the head-up display system 100 of the related art is illustrated by a graph of a dotted line.

As can be seen from fig. 4, the brightness of the light (stray light) outside the target viewing angle range-a to +a of the head-up display system 100 is largely reduced. And the light intensity within the target preset range-a to +a of the head-up display system 100 does not vary, effectively ensuring the uniformity and brightness of the display within the target viewing angle range. In the structure of fig. 3, the contrast graph of fig. 4 corresponds to the viewing angle range of the first light ray passing through the first linear polarizer 10 after the light ray exiting the display screen 31, and the angle Q corresponds to the viewing angle range of the head-up display system 100. In fig. 3, the brightness of the light rays of the head-up display system 100 provided in the embodiment of the present application is significantly reduced outside the target viewing angle ranges-a to +a, and the brightness is substantially the same within the target viewing angle ranges-a to +a as in the related art.

It is to be understood that fig. 4 only illustrates the case where the brightness of the light (stray light) outside the target viewing angle range-a to +a of the head-up display system 100 is greatly reduced, but the present application is not limited thereto, and in fact, the light (stray light) outside the target viewing angle range-a to +a of the head-up display system 100 may be filtered out almost completely even if the parameters of the first functional film 50 are properly selected.

In the embodiment of the present application, the film thickness of the first functional film 50 is positively correlated with the preset viewing angle range of the first light. In other words, when the film thickness of the first functional film 50 is thicker, the effect of filtering or weakening the light of the first light in the wide viewing angle range is stronger, and the effect of eliminating the stray light of the head-up display system is better.

In the embodiment of the present application, the extraordinary ray axis of the first functional film 50 is parallel to the light-emitting direction of the display screen 31. Therefore, the visual angles of left and right eyes of an image seen by the eyes of a person can be ensured to be symmetrical, and the imaging effect is better. It is understood that the light emitting direction of the display screen 31 may be, for example, a normal direction of the display screen 31.

Further, referring to fig. 3, the first functional film 50 is disposed on a side surface of the first linear polarizer 10 facing the second linear polarizer 20. As such, the first functional film 50 is relatively simply mounted. For example, the first functional film 50 may be adhered to the surface of the first linear polarizer 10 facing away from the display screen 31 by a transparent optical adhesive or the like. Of course, the present application is not limited thereto, and a dedicated light-transmitting optical lens may be provided between the first linear polarizer 10 and the second linear polarizer 20, and the first functional film 50 may be provided between the first linear polarizer 10 and the second linear polarizer 20 by being attached to the light-transmitting optical lens.

In this embodiment, the head-up display system 100 further includes a first optical lens 40, where the first optical lens 40 is located on a side of the first functional film 50 facing away from the first linear polarizer 10, and the second linear polarizer 20 is disposed on a surface of the first optical lens 40 facing the first functional film 50 and keeps a preset distance from the first functional film 50. In the above-mentioned scheme, the second linear polarizer 20 is kept at a preset distance from the first functional film 50, because the projection unit 30 is a component with relatively serious heat generation during operation, by setting the preset distance, the first optical lens 40 and the second linear polarizer 20 can play a role of heat insulation, and the heat transfer from the first functional film 50 to the second linear polarizer 20 is reduced as much as possible, so that the normal operation of devices, such as a reflector, located downstream in the light propagation path is affected.

Of course, the arrangement position of the first functional film 50 is not limited thereto, and may be arranged on a side surface of the first optical lens 40 facing away from the first functional film.

In the present embodiment, referring to fig. 3, the first optical lens 40 is configured as a hot mirror. This reduces sunlight entering the heads-up display system 100 to avoid the problem of damage to the display screen 31 caused by sunlight flowing back into the use environment onto vulnerable components in the heads-up display system, such as the display screen 31 of the projection unit 30.

Fig. 5 is an equivalent structural schematic diagram of another structure of the head-up display system 100 according to the embodiment of the present application.

In other examples, referring to fig. 5, the first optical lens 40 may be, for example, transparent glass, and thus may serve as a heat insulator on the one hand, and may also serve as a support carrier for the second linear polarizer 20 on the other hand.

Further, with continued reference to FIG. 1, the heads-up display system 100 may also include a reflective screen (which may be, for example, a front windshield 70), and at least one mirror for reflecting light rays exiting through the second linear polarizer 20 to the reflective screen.

In particular, the mirrors include a planar mirror 61 and a curved mirror 62, the planar mirror 61 is configured to reflect the light emitted from the second linear polarizer 20 to the curved mirror 62, and the curved mirror 62 is configured to reflect the light reflected from the planar mirror 61 to the inner surface of the front windshield 70. Wherein magnification of the image distance and visual size can be achieved with curved mirror 62.

In some embodiments, heads-up display system 100 also includes a dust cover (not shown). The dust cover, such as a light transmissive plastic cover, may be used to isolate dust from falling into the heads-up display system 100. In other embodiments, the dust cover may be a transparent glass cover, which not only isolates dust from falling into the head-up display system 100, but also reduces deformation of the cover due to heat.

Next, the operation of the head-up display system 100 according to the embodiment of the present application will be described with reference to fig. 2.

After passing through the first linear polarizer 10, the light rays exiting from the display screen 31 of the projection unit 30 are converted into linear polarized light, which continues to pass through the first functional film 50, converts the linear polarized light with a larger viewing angle range into elliptical polarized light, and is filtered out while passing through the second linear polarizer 20. The polarization state of the linearly polarized light with a smaller viewing angle range is unchanged, and the linearly polarized light continuously passes through the second linear polarizer 20, is reflected by the plane mirror 61 and the curved mirror 62, finally enters the human eye through the reflection of the reflecting screen, and the light entering the human eye is imaged into a virtual image in front of the human eye.

The present embodiment also provides a vehicle including the head-up display system 100 of the foregoing embodiment, and it is understood that the front windshield of the vehicle may be used as a reflective screen.

It should be noted that, the head-up display system in this embodiment has been described in detail in the foregoing embodiments, and the same or similar technical effects can be achieved, which will not be described in detail herein.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (10)

1. A heads-up display system, comprising:

the projection unit comprises a display screen, and a first linear polarizer is arranged on the light emergent surface of the display screen;

a second linear polarizer disposed opposite to the first linear polarizer, and having a transmission axis parallel to the transmission axis of the first linear polarizer; and

a first functional film configured as a birefringent film and located between the first linear polarizer and the second linear polarizer;

the first functional film is used for converting light rays which are outside a preset visual angle range into elliptical polarized light in first light rays which are emitted from the display screen and pass through the first linear polarizer; and the first light is used for enabling the light which is positioned in the preset visual angle range to transmit unchanged in the polarization direction.

2. The heads-up display system of claim 1 wherein a film thickness of the first functional film is positively correlated with the preset viewing angle range.

3. The heads-up display system of claim 1 wherein an extraordinary ray axis of the first functional film is parallel to a light exit direction of the display screen.

4. A heads-up display system according to any of claims 1-3, wherein the first functional film is provided on a side surface of the first linear polarizer facing the second linear polarizer.

5. A heads-up display system according to any of claims 1-3, further comprising a first optical lens located on a side of the first functional film facing away from the first linear polarizer, the second linear polarizer being disposed on a surface of the first optical lens facing the first functional film and being maintained at a predetermined distance from the first functional film.

6. The heads-up display system of claim 5 wherein the first optical lens is configured as a hot mirror.

7. A heads-up display system according to any of claims 1-3, further comprising a reflective screen and at least one mirror for reflecting light rays exiting through the second linear polarizer to the reflective screen.

8. The heads-up display system of claim 7 wherein the mirror comprises a planar mirror and a curved mirror;

the plane reflector is used for reflecting the light rays emitted by the second linear polarizer to the curved reflector, and the curved reflector is used for reflecting the light rays reflected by the plane reflector to the reflecting screen.

9. A heads-up display system according to any of claims 1-3, wherein the projection unit further comprises a backlight module, the display screen being configured as a liquid crystal display screen, the backlight module being arranged on a side of the display screen facing away from the first linear polarizer.

10. A vehicle comprising a heads-up display system as claimed in any one of claims 1-9.

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