CN219065892U - Head-up display device - Google Patents

Abstract

The embodiment of the utility model discloses a head-up display device which comprises a backlight assembly, an eyepiece assembly and an optical waveguide single-machine wave plate, wherein the optical waveguide single-machine wave plate is arranged on the eyepiece assembly; a backlight assembly providing backlight to the eyepiece assembly; the ocular assembly comprises a plurality of reflecting units and a plurality of lens groups arranged along the light path of the image light beam in the ocular assembly; the reflecting unit adjusts the optical path; the lens group adjusts the propagation direction of the image beam; the first end of the ocular assembly is fixedly connected with the backlight assembly, and the ocular assembly is positioned on the emergent light path of the image light beam; the optical waveguide single-unit wave plate is fixedly connected with the ocular assembly, and an image light beam emitted by the ocular assembly vertically enters the optical waveguide single-unit wave plate; the image light beam enters the ocular assembly from the first end of the ocular assembly, passes through the ocular assembly to adjust the propagation direction, and is emitted vertically from the second end of the ocular assembly, and is coupled into the optical waveguide single-unit wave plate from one end of the optical waveguide single-unit wave plate, which is close to the second end of the ocular assembly, and totally reflected to the other end in the optical waveguide single-unit wave plate and coupled out.

Description

Head-up display device

Technical Field

The utility model relates to the technical field of optics, in particular to a head-up display device.

Background

The head-up display (HUD) system is an important component of a man-machine interaction scheme, is an important system component for realizing the intellectualization, networking and man-machine interaction of vehicles in the future, and can be roughly divided into a first generation C-HUD combined type, a second generation W-HUD windshield type and a third generation AR-HUD enhanced reality type according to different product imaging modes and imaging forms of the HUD system.

HUD on the market all realizes through big curved mirror, because curved mirror volume is great leads to the HUD to want to further reduce the volume very difficult, and curved mirror belongs to complicated high-accuracy part in the HUD, and the price is higher.

Disclosure of Invention

The embodiment of the utility model provides a head-up display device, which shortens the optical path of an image light beam, reduces the volume of the head-up display device, leaves a space below the head-up display device through optical path adjustment, and can further obtain a field angle (FOV) and a Virtual Image Distance (VID) meeting the requirements of a user by adjusting parameters of a lens group and a reflecting unit, thereby solving the problems that the prior head-up display device uses a large curved mirror to adjust the optical path, so that the volume of the device is overlarge, and the large curved mirror belongs to complex high-precision parts and has higher price.

According to one aspect of the utility model, there is provided a head-up display device, comprising a backlight assembly, an eyepiece assembly and an optical waveguide single-unit wave plate;

the backlight assembly provides backlight to the eyepiece assembly; the eyepiece assembly comprises a plurality of reflecting units and a plurality of lens groups arranged along the optical path of the image light beam in the eyepiece assembly; the plurality of reflecting units are used for adjusting the optical path; the lens groups are used for adjusting the propagation direction of the image light beams;

the first end of the eyepiece assembly is fixedly connected with the backlight assembly, and the eyepiece assembly is positioned on an emergent light path of the image light beam; the optical waveguide single-unit wave plate is fixedly connected with the eyepiece assembly, and an image light beam emitted by the eyepiece assembly vertically enters the optical waveguide single-unit wave plate;

the image light beam is incident to the ocular assembly from the first end of the ocular assembly, passes through the ocular assembly to adjust the propagation direction and the light path adjustment, is emitted vertically from the second end of the ocular assembly, is coupled into the optical waveguide single-unit wave plate from one end of the optical waveguide single-unit wave plate, which is close to the second end of the ocular assembly, and is totally reflected to the other end in the optical waveguide single-unit wave plate and coupled out.

Optionally, the lens group includes a first lens group and a second lens group;

the first lens group is configured to be mounted proximate the first end of the eyepiece assembly; the second lens group is configured to be mounted proximate the second end of the eyepiece assembly; the lens centers of the first lens group and the second lens group are sequentially positioned on a main optical axis of the image light beam, and the main optical axis is parallel to the central connecting line of the first lens group and the second lens group;

the lens center is the lens center of the lens contained in the first lens group and the second lens group.

Optionally, the first lens group includes a primary lens and a secondary lens; the second lens group comprises a tertiary lens, a quaternary lens and a penta-stage lens;

the primary lens is configured to be mounted near the first end of the eyepiece assembly on an image beam exit light path of the backlight assembly; the secondary lens is positioned on the emergent light path of the primary lens; the third-stage lens, the fourth-stage lens and the fifth-stage lens are sequentially arranged on the optical path of the first lens group.

Optionally, the reflecting unit includes a primary plane mirror, a secondary plane mirror and a tertiary plane mirror;

the primary plane mirror is positioned on an emergent light path of the first lens group and has a first preset included angle with the main optical axis; the second plane mirror is positioned on the reflection light path of the first plane mirror, has a second preset included angle with the main optical axis and is arranged opposite to the first plane mirror; the three-stage plane mirror is positioned on an emergent light path of the second lens group and has a third preset included angle with the main optical axis; the primary plane mirror reflects the image beam emitted by the first lens group to the secondary plane mirror, and reflects the image beam to the second lens group through the secondary plane mirror; and the three-stage plane mirror reflects the image light beams emitted by the second lens group to the optical waveguide single-machine wave plate.

Optionally, the first-order lens comprises a plane convex lens with one plane and the other plane being convex; the secondary lens comprises a biconcave lens; the tertiary lens comprises a biconvex lens; the four-stage lens comprises a biconcave lens; the five-stage lens includes a biconvex lens.

Optionally, the backlight assembly comprises a backlight circuit board and a liquid crystal display screen;

the backlight circuit board comprises a plurality of individually controlled light emitting units;

the liquid crystal display screen is positioned on the light paths of the light rays emitted by the light emitting units which are controlled independently;

the backlight circuit board is used for emitting light rays corresponding to the image light beams; the liquid crystal display screen is used for displaying images and emitting the image light beams.

Optionally, the plurality of individually controlled light emitting units include N rows and M columns of LED light beads; the LED lamp beads in the N rows and the M columns are configured to be capable of independently adjusting the brightness of each column of LED lamp beads;

wherein N is more than or equal to 2, or M is more than or equal to 2, and N and M are integers.

Optionally, the backlight assembly further comprises a collimation part and a light homogenizing film;

the collimation part is positioned on an emergent light path of the backlight circuit board; the light homogenizing film is positioned on the emergent light path of the collimation part;

the collimation part is used for collimating the emergent rays of the light-emitting unit; the light homogenizing film is used for enabling the brightness of the emergent light of the collimation portion to be uniform.

Optionally, the optical waveguide single-machine wave plate includes at least one in-coupling structure, at least one out-coupling structure, and at least one pupil expanding structure.

Optionally, the head-up display device further includes a waveguide bracket; the eyepiece assembly further includes a first housing and a second housing; the first shell and the second shell comprise a plurality of limit grooves; the first shell comprises a light outlet;

the waveguide support is positioned above the first shell, and the single-machine optical waveguide wave plate is glued to the waveguide support;

the reflecting unit is adhered inside the first shell and the second shell, and the lens group is limited in the limiting groove through a rubber pad.

According to the head-up display device provided by the embodiment of the utility model, backlight is provided for the ocular assembly through the backlight assembly, an image beam enters the ocular assembly in an incident way, the propagation direction is adjusted through the lens group in the ocular assembly, the optical path is adjusted through the reflecting unit, and then the image beam exits through the optical waveguide single-unit wave plate. According to the technical scheme, the optical path of the image light beam is shortened, the volume of the head-up display device is reduced, a space is reserved below the head-up display device through optical path adjustment, and parameters of the lens group and the reflecting unit can be adjusted to further obtain a field of view (FOV) and a Virtual Image Distance (VID) meeting the requirements of a user, so that the problems that the existing head-up display device uses a large curved mirror to adjust the optical path, the device is overlarge in volume, and the large curved mirror belongs to complex high-precision parts and is high in price are solved.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the utility model or to delineate the scope of the utility model. Other features of the present utility model will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a head-up display device according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of a component structure of a head-up display device according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a housing of an eyepiece assembly according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of a lens assembly with a rubber pad according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram of a backlight assembly according to an embodiment of the present utility model;

fig. 6 is a schematic structural diagram of a backlight circuit board according to an embodiment of the present utility model.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Fig. 1 is a schematic structural diagram of a head-up display device according to an embodiment of the present utility model, and fig. 2 is a schematic structural diagram of a component of a head-up display device according to an embodiment of the present utility model. As shown in fig. 1 and 2, the head up display device includes a backlight assembly 100, an eyepiece assembly 200, and an optical waveguide single-unit wave plate 300. Backlight assembly 100 provides backlight for eyepiece assembly 200; the eyepiece assembly 200 includes a plurality of reflection units 210 and a plurality of lens groups 220 disposed along the optical path of the image beam within the eyepiece assembly 200; the plurality of reflection units 210 are used for adjusting the optical path; the plurality of lens groups 220 are used to adjust the propagation direction of the image beam; the first end 201 of the eyepiece assembly 200 is fixedly connected with the backlight assembly 100, and the eyepiece assembly 200 is positioned on an emergent light path of the image light beam; the optical waveguide single-unit wave plate 300 is fixedly connected with the eyepiece assembly 200, and an image light beam emitted by the eyepiece assembly 200 vertically enters the optical waveguide single-unit wave plate 300; the image light beam enters the eyepiece assembly 200 from the first end 201 of the eyepiece assembly 200, passes through the eyepiece assembly 200 to adjust the propagation direction and the optical path length, and is emitted vertically from the second end 202 of the eyepiece assembly 200, and is coupled into the optical waveguide single-unit wave plate 300 from one end 301 of the optical waveguide single-unit wave plate 300, which is close to the second end 202 of the eyepiece assembly 200, and totally reflected in the optical waveguide single-unit wave plate 300 to the other end 302 and coupled out.

The backlight assembly 100 includes, but is not limited to, a backlight circuit board for controlling the backlight assembly 100, and a liquid crystal display for displaying a target image, and may be set according to a parameter requirement for an image beam, where the parameter requirement is not limited, for example, a light emitting source is provided, and an optical device for collimating and homogenizing light emitted by the light source may be provided. The target image may include various image elements, for example, image elements including external scene information acquired according to a vehicle sensor and a camera, digital signals converted by a vehicle and a machine, and further generated navigation information, collision early warning information and the like, and various image elements including vehicle running information, for example, dashboard information and the like.

The target image is an image displayed by the HUD and projected onto a front window (e.g., a front windshield) of the vehicle or an emission film layer or an imaging window disposed on a surface of the front window of the vehicle near the head-up display device, in other words, the target image is an image viewed by an end user in a certain area of the vehicle through the front window, the emission film layer, or the imaging window. Wherein the imaging window is typically an imaging plate made of transparent material (transparent to visible light) and having a curvature. The image beam is the image beam of the target image displayed by the HUD.

The eyepiece assembly 200 includes, but is not limited to, a plurality of reflection units 210 and a plurality of lens groups 220, and a buffer device for preventing collision between the reflection units 210 and the lens groups 220 may be provided according to a specific installation position of the head-up display device and parameters of the vehicle. The number, arrangement position and actual specification of the reflecting units 210 may be set according to the actual shape of the eyepiece assembly 200 and the requirements for the imaging FOV (field of view) and VID (virtual image distance), but are not limited thereto, for example, the reflecting units 210 may be three plane mirrors, two of which are used to adjust the optical paths so that a space is left below the eyepiece assembly 200, and the other is used to reflect the image beam out of the eyepiece assembly 200, so that the image beam emitted from the eyepiece assembly 200 can be vertically coupled into the single optical waveguide waveplate 300. The specific number, lens composition and arrangement position of the lens groups 220 may be set according to actual requirements, and are not limited herein.

The actual specifications of the single optical waveguide waveplate 300 may be set according to the actual requirements, and are not limited herein, for example, the thickness of the single optical waveguide waveplate 300, the number of in-gratings and out-gratings, and the exit pupil expansion grating according to the size of the eye box and FOV and VID.

Wherein, the first end 201 of the eyepiece assembly 200 is fixedly connected with the backlight assembly 100, and the lens at the first end 201 of the eyepiece assembly 200 can be limited by a limiting groove in the shell configured by the eyepiece assembly 200 and a rubber pad in the limiting groove to be positioned on the first shell 230 and the second shell 240 of the backlight assembly 100; the optical waveguide single-unit wave plate 300 is fixedly connected with the eyepiece assembly 200, and the optical waveguide single-unit wave plate 300 is glued on a waveguide bracket fixed above the image light beam emitted by the eyepiece assembly 200, and the coupling structure of the optical waveguide single-unit wave plate 300 corresponds to the image emitting end of the eyepiece assembly 200.

Specifically, the backlight assembly 100 emits an image beam, which is incident on the eyepiece assembly 200 from the first end 201 of the eyepiece assembly 200, passes through the lens group 220 to adjust the propagation direction, and the optical path of the reflection unit 210 to be adjusted, and is emitted vertically from the second end 202 of the eyepiece assembly 200 to the single-optical-waveguide waveplate 300. Further, the optical waveguide single-unit wave plate 300 is coupled into the optical waveguide single-unit wave plate 300 from one end 301 of the optical waveguide single-unit wave plate 300 near the second end 202 of the eyepiece assembly 200, and totally reflected to the other end 302 and coupled out in the optical waveguide single-unit wave plate 300.

According to the technical scheme, the optical path of the image light beam is adjusted through the eyepiece assembly, so that the optical path is shortened, the size of the head-up display device is reduced, a space is reserved above or below the head-up display device, and parameters of the lens group and the reflecting unit can be adjusted, so that the field of view (FOV) and the Virtual Image Distance (VID) meeting the requirements of a user are obtained, and the problems that the size of the device is overlarge, the large curved mirror belongs to complex high-precision parts and the price is high due to the fact that the large curved mirror is used for adjusting the optical path in the conventional head-up display device are solved.

Optionally, with continued reference to fig. 2, the lens group 220 includes a first lens group 221 and a second lens group 222. The first lens group 221 is configured to be mounted proximate to the first end 201 of the eyepiece assembly 200; the second lens group 222 is configured to be mounted near the second end 202 of the eyepiece assembly 200; lens centers of the first lens group 221 and the second lens group 222 are sequentially positioned on a main optical axis of the image beam, and the main optical axis is parallel to a central connecting line of the first lens group 221 and the second lens group 222; the lens center is the lens center of the lens included in the first lens group 221 and the second lens group 222.

The first lens group 221 may include a plurality of lenses, such as a plano-convex lens positioned on the outgoing path of the image beam of the backlight assembly 100 by a limiting groove and a rubber gasket, and a convex-concave lens positioned on the outgoing path of the plano-convex lens. The second lens group 221 may include a plurality of lenses, such as a biconvex lens, a biconcave lens, and a biconvex lens, which are sequentially disposed along the exit optical path of the first lens group 221. The specific lens composition and lens parameters of the first lens group 221 and the second lens group 222 may be set according to the actual FOV and VID requirements, and are not limited herein.

Specifically, the image beam sequentially passes through the first lens group 221 and the second lens group 222 to adjust the propagation direction, and the lens centers of the first lens group 221 and the second lens group 222 are sequentially located on the main optical axis of the image beam, and the main optical axis is parallel to the central connecting line of the first lens group 221 and the second lens group 222, so that the propagation direction is adjusted, the optical path is shortened, and the imaging quality of the human eye is ensured.

Optionally, with continued reference to fig. 2, the first lens group 221 includes a primary lens 2211 and a secondary lens 2212; the second lens group 222 includes a tertiary lens 2221, a quaternary lens 2222, and a quaternary lens 2223. The primary lens 2211 is positioned at the first end 201 of the eyepiece assembly 200; the secondary lens 2212 is positioned on the outgoing light path of the primary lens 2211; the tertiary lens 2221, the quaternary lens 2222, and the quaternary lens 2223 are disposed in order on the optical path of the first lens group 221.

The specific types and parameters of the primary lens 2211, the secondary lens 2212, the tertiary lens 2221, the quaternary lens 2222 and the quaternary lens 2223 may be set according to the actual FOV and VID requirements, and the setting manner may be limited to the image beam outgoing path of the backlight assembly 100 by a limiting groove and a rubber pad configured in the eyepiece assembly 200.

Specifically, the image beam sequentially passes through the first lens 2211, the second lens 2212, the third lens 2221, the fourth lens 2222 and the fifth lens 2223 to adjust the propagation direction, and the lens center is sequentially located on the main optical axis of the image beam, so that the propagation direction adjustment is realized, the optical path is shortened, and the imaging quality of the human eye is ensured.

Optionally, with continued reference to fig. 2, the primary lens 2211 is a plano-convex lens with one surface being plano-convex and the other surface being convex; the secondary lens 2212 is a convex-concave lens; the tertiary lens 2221 is a biconvex lens; the four-stage lens 2222 is a biconcave lens; the five-stage lens 2223 is a biconvex lens.

Optionally, with continued reference to fig. 2, the reflection unit 210 includes a primary plane mirror 211, a secondary plane mirror 212, and a tertiary plane mirror 213. The primary plane mirror 211 is located on the outgoing light path of the first lens group 221 and has a first preset included angle with the main optical axis; the second level plane mirror 212 is positioned on the reflection light path of the first level plane mirror 211, has a second preset included angle with the main optical axis, and is arranged opposite to the first level plane mirror 211; the third-stage plane mirror 213 is located on the outgoing light path of the second lens group 222 and has a third preset included angle with the main optical axis; the primary plane mirror 211 reflects the image beam emitted from the first lens group 221 to the secondary plane mirror 212, and reflects the image beam to the second lens group 222 through the secondary plane mirror 212; the three-stage mirror 213 reflects the image beam emitted from the second lens group 222 to the optical waveguide single-unit wave plate 300.

The specific specifications of the primary plane mirror 211, the secondary plane mirror 212, and the tertiary plane mirror 213, such as the plane mirror area, and the relative arrangement positions of the first lens group 221 and the second lens group 222 and the included angles with the main optical axis (the first preset included angle, the second preset included angle, and the third preset included angle) can be set according to the external shape requirement and the imaging requirement of the actual eyepiece assembly, which is not limited herein.

Specifically, the image beam is incident on the primary plane mirror 211 through the first lens group 221, reflected to the secondary plane mirror 212 through the primary plane mirror 211, further reflected to the second lens group 222 by the secondary plane mirror 212, and emitted to the tertiary plane mirror 213 through the second lens group 22, and reflected out of the eyepiece assembly 200 by the tertiary plane mirror 213, so that the image beam is vertically coupled into the single optical waveguide waveplate 300. It can be appreciated that the primary plane mirror 211 and the secondary plane mirror 212 are disposed opposite to each other and have a certain included angle with the main optical axis, so that the optical path of the image beam can be shortened, and a space is reserved below the eyepiece assembly 200, and the volume of the head-up display device is reduced.

Optionally, fig. 3 is a schematic structural diagram of a housing of an eyepiece assembly according to an embodiment of the present utility model, and referring to fig. 1 and fig. 2, the head-up display device according to the embodiment of the present utility model further includes a waveguide bracket 400, and referring to fig. 2 and fig. 3, the eyepiece assembly 200 further includes a first housing 230 and a second housing 240; the first housing 230 and the second housing 240 include a plurality of limit grooves 250; the first housing 230 includes a light outlet 231. The waveguide support 400 is located above the first housing 230, and the single-unit waveplate 300 is glued to the waveguide support 400; the reflection unit 210 is adhered inside the limiting grooves 250 inside the first and second cases 230 and 240, and the lens group 220 is limited in the limiting grooves 250 by rubber pads, so that the lens group 220 can be prevented from shaking or even chipping due to stress while the lens group 220 is fixed.

The materials and shapes of the first and second housings 230 and 240 may be defined according to the actual shapes of the lens assembly 220 and the reflection unit 230 included in the eyepiece assembly 200 and the external shape of the head-up display device, which are not limited herein. The waveguide bracket 400 may be fixed above the first housing 230 by providing screw holes in the first housing 230 and screws. The position and the shape of the limiting groove 250 may be set according to the requirements of the imaging FOV and VID, and further the parameters and the specification requirements of the obtained lens set 220, which are not limited herein.

Specifically, the shapes of the first housing 230 and the second housing 240 are adapted according to the eyepiece assembly, so that a space is reserved below the head-up display device for the rest of the devices to be mounted. The lens group 220 and the reflection unit 210 are fixed inside the first housing 230 and the second housing 240 through rubber, so that impact of external environmental impact to the eyepiece assembly 200 can be reduced in an actual driving process, internal optical components are protected, and imaging quality is guaranteed.

For example, fig. 4 is a schematic structural diagram of a lens assembly with a rubber pad according to an embodiment of the present utility model, as shown in fig. 4, a rubber pad 260 is disposed at a fixed end of a lens assembly 220, so as to prevent damage and positional deviation of an optical component caused by bumping and jolting factors in a vehicle-mounted use process of a head-up display device, and further ensure an imaging effect of the head-up display device.

In summary, according to the technical scheme of the embodiment of the utility model, on the basis of the embodiment, the technical effects of shortening the optical path and adjusting the optical path are achieved by integrating the units and the lens groups into the eyepiece assembly, and the problems of overlarge device volume and overlarge cost caused by the fact that the existing head-up display device uses a large curved mirror to achieve optical path modulation and adjustment are solved.

Optionally, fig. 5 is a schematic structural diagram of a backlight assembly according to an embodiment of the present utility model, and as shown in fig. 5, a backlight assembly 100 according to an embodiment of the present utility model includes: a backlight circuit board 110 and a liquid crystal display 120. The backlight circuit board 110 includes a plurality of individually controlled light emitting units 111; the liquid crystal display 120 is located on the light paths of the light emitted from the plurality of individually controlled light emitting units 111; the backlight circuit board 110 is used for emitting light corresponding to the image light beam; the liquid crystal display 120 is used for displaying an image and emitting an image beam.

The backlight circuit board 110 includes, but is not limited to, a light emitting circuit board integrated by using LED beads in series-parallel connection, and the type and arrangement manner of the plurality of light emitting units 111 of the backlight circuit board 110 can be adapted and adjusted on the basis of guaranteeing the imaging quality of the image light beam and the human eyes according to the actual light requirements and the actual specifications of the eyepiece assembly 200, the optical waveguide single-unit wave plate 300 and the liquid crystal display 120, and the actual composition of the backlight circuit board 110 is not limited herein. The liquid crystal display 120 includes, but is not limited to, an LCD display, and may be selected according to actual imaging requirements, and specific specifications and types are not limited herein.

Specifically, the white light is diffracted by the optical waveguide single-unit wave plate 300 and then coupled into the image light beam, the same color light beam changes color along with different coupling distances, and the brightness of the light beam with different colors can be compensated by independently controlling the brightness and the colors of the plurality of light emitting units 111, so that the problems of color change and uneven brightness generated after the image light beam is coupled out by the optical waveguide single-unit wave plate 300 can be solved.

Optionally, fig. 6 is a schematic structural diagram of a backlight circuit board according to an embodiment of the present utility model, as shown in fig. 6, where a plurality of individually controlled light emitting units 111 include N rows and M columns of LED light beads; the LED lamp beads in N rows and M columns are configured to be capable of independently adjusting the brightness of each column of LED lamp beads; wherein N is greater than or equal to 2, or M is greater than or equal to 2, and N and M are integers.

The actual values of N and M may be set according to the actual imaging requirements and the actual specifications of the lcd 120, and are not limited herein, for example, N is 3 and M is 20. The actual light emitting color of the LED lamp beads can be set according to the actual imaging requirement, and the method is not limited herein, for example, the LED lamp beads are red, green and blue, the N rows of LED lamp beads are LED lamp beads with the same light emitting, and are connected in series to form a string, and the M columns of LED lamp beads are arranged alternately in series to form three-color light beads.

Specifically, the brightness and the color of each row of LED lamp beads are independently adjusted, so that the problems of color change and uneven brightness of the image light beam at the coupling-out end of the optical waveguide single-machine wave plate 300 are compensated.

Optionally, with continued reference to fig. 5, the backlight assembly 100 further includes a collimation portion 130, a light homogenizing film 140; the collimation part 130 is positioned on the emergent light path of the backlight circuit board 110; the dodging film 140 is located on the outgoing light path of the collimation portion 130; the collimating part 130 is used for collimating the emergent light of the light emitting unit 131; the light homogenizing film 140 is used for homogenizing the brightness of the outgoing light of the collimating part 130.

The collimating portion 130 includes, but is not limited to, a total internal reflection (total internal reflection, TIR) lens, and specific parameters of the collimating portion 130 may be set according to practical requirements, which is not limited herein. The specification of the light homogenizing film 140 may be set according to actual requirements, and is not limited herein.

Specifically, the backlight circuit board 100 emits light, and the scattered light is collimated by the collimating part 130 and emitted to the dodging film 140, so as to compensate for the uneven brightness of the light caused by the gaps between the light emitting units 111 of the backlight circuit board 110 and the non-arrangement of the light emitting units 111 at the periphery of the backlight circuit board 110, thereby affecting the quality of the image beam emitted from the liquid crystal display 120 and the imaging of the head-up display device.

In summary, according to the technical solution of the embodiment of the present utility model, on the basis of the above embodiment, by integrating components such as a backlight circuit board and a liquid crystal display into a backlight assembly, and providing separately controlled light emitting units and components for light collimation, brightness adjustment, etc., the volume of the head-up display device is reduced, and meanwhile, the problems of uneven brightness and color change caused by diffraction of image light beams are compensated.

Optionally, the optical waveguide single-machine waveplate 300 includes at least one in-coupling structure, at least one out-coupling structure, and at least one pupil-expanding structure.

Wherein the coupling-in structure is used to couple the image beam into the optical waveguide single-machine waveplate 300, including but not limited to, a coupling-in grating. The out-coupling structure is used to couple the image beam out of the optical waveguide single-machine waveplate 300, including but not limited to an out-coupling grating. The in-coupling grating, the out-coupling grating, may be a Surface Relief Grating (SRG) or a holographic volume grating (VHG), typically the area of the in-coupling grating is smaller than the area of the out-coupling grating.

The mydriasis structure is used to achieve mydriasis of the image beam, including but not limited to a one-dimensional mydriasis grating or a two-dimensional mydriasis grating. The specific number of the coupling-in structures, the coupling-out structures, and the pupil-expanding structures, and the positions of the coupling-in structures, the coupling-out structures, and the pupil-expanding structures relative to the single optical waveguide waveplate 300 may be set according to actual imaging requirements, and are not limited herein.

Specifically, the optical waveguide single-unit wave plate 300 includes at least one coupling-in structure, at least one coupling-out structure and at least one pupil expansion structure, so that pupil expansion is realized while the image light beam is coupled into the optical waveguide single-unit wave plate 300 and coupled out from the coupling-out structure through total reflection, so that the imaging of the head-up display device can meet the user requirement.

The above embodiments do not limit the scope of the present utility model. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the scope of the present utility model.

Claims (10)

1. The head-up display device is characterized by comprising a backlight assembly, an eyepiece assembly and an optical waveguide single-machine wave plate;

the backlight assembly provides backlight to the eyepiece assembly; the eyepiece assembly comprises a plurality of reflecting units and a plurality of lens groups arranged along the optical path of the eyepiece assembly image light beam; the plurality of reflecting units are used for adjusting the optical path; the lens groups are used for adjusting the propagation direction of the image light beams;

the first end of the eyepiece assembly is fixedly connected with the backlight assembly, and the eyepiece assembly is positioned on an emergent light path of the image light beam; the optical waveguide single-unit wave plate is fixedly connected with the eyepiece assembly, and an image light beam emitted by the eyepiece assembly vertically enters the optical waveguide single-unit wave plate;

the image light beam is incident to the eyepiece assembly from the first end of the eyepiece assembly, passes through the eyepiece assembly to adjust the propagation direction, is emitted vertically from the second end of the eyepiece assembly, is coupled into the optical waveguide single-unit wave plate from one end of the optical waveguide single-unit wave plate, which is close to the second end of the eyepiece assembly, and is totally reflected to the other end in the optical waveguide single-unit wave plate and coupled out.

2. The heads-up display device of claim 1 wherein the lens group includes a first lens group and a second lens group;

the first lens group is configured to be mounted proximate the first end of the eyepiece assembly; the second lens group is configured to be mounted proximate the second end of the eyepiece assembly; the lens centers of the first lens group and the second lens group are sequentially positioned on a main optical axis of the image light beam, and the main optical axis is parallel to the central connecting line of the first lens group and the second lens group;

the lens center is the lens center of the lens contained in the first lens group and the second lens group.

3. The heads-up display device of claim 2 wherein the first lens group includes a primary lens and a secondary lens; the second lens group comprises a tertiary lens, a quaternary lens and a penta-stage lens;

the primary lens is configured to be mounted near the first end of the eyepiece assembly on an image beam exit light path of the backlight assembly; the secondary lens is positioned on the emergent light path of the primary lens; the third-stage lens, the fourth-stage lens and the fifth-stage lens are sequentially arranged on the optical path of the first lens group.

4. The head-up display device of claim 2, wherein the reflection unit comprises a primary plane mirror, a secondary plane mirror, and a tertiary plane mirror;

the primary plane mirror is positioned on an emergent light path of the first lens group and has a first preset included angle with the main optical axis; the second plane mirror is positioned on the reflection light path of the first plane mirror, has a second preset included angle with the main optical axis and is arranged opposite to the first plane mirror; the three-stage plane mirror is positioned on an emergent light path of the second lens group and has a third preset included angle with the main optical axis; the primary plane mirror reflects the image beam emitted by the first lens group to the secondary plane mirror, and reflects the image beam to the second lens group through the secondary plane mirror; and the three-stage plane mirror reflects the image light beams emitted by the second lens group to the optical waveguide single-machine wave plate.

5. The head-up display device of claim 3, wherein the primary lens comprises a plano-convex lens with one surface being flat and the other surface being convex; the secondary lens comprises a biconcave lens; the tertiary lens comprises a biconvex lens; the four-stage lens comprises a biconcave lens; the five-stage lens includes a biconvex lens.

6. The head-up display device of claim 1, wherein the backlight assembly comprises a backlight circuit board and a liquid crystal display screen;

the backlight circuit board comprises a plurality of individually controlled light emitting units;

the liquid crystal display screen is positioned on the light paths of the light rays emitted by the light emitting units which are controlled independently;

the backlight circuit board is used for emitting light rays corresponding to the image light beams; the liquid crystal display screen is used for displaying images and emitting the image light beams.

7. The heads-up display device of claim 6 wherein a plurality of individually controlled light emitting units comprise N rows and M columns of LED light beads; the LED lamp beads in the N rows and the M columns are configured to be capable of independently adjusting the brightness of each column of LED lamp beads;

wherein N is more than or equal to 2, or M is more than or equal to 2, and N and M are integers.

8. The head-up display device of claim 6 or 7, wherein the backlight assembly further comprises a collimating section, a light homogenizing film;

the collimation part is positioned on an emergent light path of the backlight circuit board; the light homogenizing film is positioned on the emergent light path of the collimation part;

the collimation part is used for collimating the emergent rays of the light-emitting unit; the light homogenizing film is used for enabling the brightness of the emergent light of the collimation portion to be uniform.

9. The head-up display device of claim 1, wherein the optical waveguide single-machine wave plate comprises at least one in-coupling structure, at least one out-coupling structure, and at least one pupil-expanding structure.

10. The head-up display device of claim 1, further comprising a waveguide support; the eyepiece assembly further includes a first housing and a second housing; the first shell and the second shell comprise a plurality of limit grooves; the first shell comprises a light outlet;

the waveguide support is positioned above the first shell, and the single-machine optical waveguide wave plate is glued to the waveguide support;

the reflecting unit is adhered inside the first shell and the second shell, and the lens group is limited in the limiting groove through a rubber pad.

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