CN212873082U - Backlight device and head-up display - Google Patents

Abstract

The utility model provides a backlight device and new line display, relates to new line display technical field, including the light source, be provided with light bar and fresnel lens's leaded light shell and be provided with the installation shell of display screen, light source, leaded light shell, installation shell fixed connection in proper order, and light source, light bar, fresnel lens and display screen set gradually along the light path, are provided with the reflection stratum in the light bar, and the light that the light source sent throws to the display screen behind reflection to fresnel lens behind the light bar. The backlight device and the head-up display have the advantages of simple structure and can effectively improve the production efficiency of the vehicle-mounted HUD.

Description

Backlight device and head-up display

Technical Field

The utility model relates to a new line display technical field particularly, relates to a backlight device and new line display.

Background

Head-up displays (HUDs), also known as Head-up displays, are commonly used in the field of aviation, and originate from helmet displays for pilots and Head-up displays for flight cabins. The pilot can see the important information required by the pilot without lowering the head, the sight line is kept to be always level up, and the trouble that the pilot needs to lower the head to check the information and the discomfort caused by the continuous adjustment of the focal length of eyes are solved. Now get into the automotive filed more and more for important driving information such as display speed, navigation, turn to, oil consumption can make motorist be absorbed in and drive, need not look at the panel board with the head down, ensured safe driving well, promoted driving experience.

At present, the backlight device structure of on-vehicle HUD among the prior art is comparatively complicated, and production and processing is comparatively difficult, leads to on-vehicle HUD's production efficiency to be lower.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a backlight device and new line display have simple structure's advantage, can effectively improve on-vehicle HUD's production efficiency.

The embodiment of the utility model is realized like this:

the embodiment of the utility model provides an aspect provides a backlight device, including the light source, be provided with light bar and fresnel lens's leaded light shell and be provided with the installation shell of display screen, the light source the leaded light shell the installation shell is fixed connection in proper order, the light source the light bar fresnel lens with the display screen sets gradually along the light path, be provided with the reflection stratum in the light bar, the light that the light source sent passes through the light bar after-reflection extremely throw behind the fresnel lens extremely the display screen. The backlight device has the advantage of simple structure, and can effectively improve the production efficiency of the vehicle-mounted HUD.

Optionally, in an embodiment of the present invention, the light guide shell is provided with a first clamping portion, the mounting shell is provided with a second clamping portion, and the first clamping portion is clamped with the second clamping portion, so that the light guide shell is clamped with the mounting shell.

Optionally, in the preferred embodiment of the present invention, a mounting groove for accommodating the display screen is provided in the mounting shell, the mounting groove is provided with four side walls which are connected end to end in the mounting shell, two adjacent side walls of the mounting groove are respectively provided with a first elastic sheet, the first elastic sheet is fixed to the side wall of the mounting groove in cooperation with the side wall of the mounting groove.

Optionally, in a preferred embodiment of the present invention, the first elastic sheet is a Z-shaped structure, and one end of the Z-shaped structure is fixedly connected to the side wall of the mounting groove, and the other end of the Z-shaped structure is used for abutting against the side wall of the display screen.

Optionally, in the preferred embodiment of the present invention, the display device further comprises a pressing frame, a third clamping portion is disposed on the pressing frame, a fourth clamping portion is disposed in the installation shell, and the third clamping portion is clamped with the fourth clamping portion, so that the pressing frame is clamped with the installation shell.

Optionally, in a preferred embodiment of the present invention, a second elastic sheet is disposed on the pressing frame, and the second elastic sheet is used for abutting against an edge of the display screen.

Optionally, in the preferred embodiment of the present invention, the display device further includes a flexible supporting sheet sandwiched between the bottom wall of the mounting groove and the edge of the display screen.

Optionally, in a preferred embodiment of the present invention, the display device further includes a polarization film disposed in the mounting housing and located on a side surface of the display screen away from the fresnel lens.

The embodiment of the utility model provides a further aspect provides a new line display, including the shell and set up in foretell backlight unit in the shell. The backlight device has the advantage of simple structure, and can effectively improve the production efficiency of the vehicle-mounted HUD.

Optionally, in a preferred embodiment of the present invention, the material of the housing is a heat conductive metal, and the backlight device further includes a heat conductive film sandwiched between the light source of the backlight device and the housing.

The utility model discloses beneficial effect includes:

the backlight device comprises a light source, a light guide shell and an installation shell, wherein the light guide shell is provided with a light bar and a Fresnel lens, the installation shell is provided with a display screen, the light source, the light guide shell and the installation shell are fixedly connected in sequence, the light source, the light bar, the Fresnel lens and the display screen are sequentially arranged along a light path, a reflection layer is arranged in the light bar, and light rays emitted by the light source are reflected to the Fresnel lens through the light bar and then projected to the display screen. With optical wand and fresnel lens fixed mounting in leading the light shell, with display screen fixed mounting in the installation shell, again with light source, lead light shell, installation shell fixed connection in proper order, light source, optical wand, fresnel lens and display screen set gradually along the light path, are provided with the reflection stratum in the optical wand to the light that makes the light source send can reflect to fresnel lens through the optical wand after, and throw to the display screen behind the fresnel lens. Compare in on-vehicle HUD among the prior art, the backlight unit structure that this embodiment provided is simple compact more, can effectively improve on-vehicle HUD's production efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a backlight device according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a display screen and a mounting case in a backlight device according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a mounting case and a flexible supporting sheet in a backlight device according to an embodiment of the present invention;

fig. 4 is a second schematic structural diagram of a display screen and a mounting case in a backlight device according to an embodiment of the present invention;

fig. 5 is a schematic structural view of an installation housing, a diffusion film and a pressure-sensitive screen frame in a backlight device according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a light source, a light bar, a fresnel lens, and a light guide shell in a backlight device according to an embodiment of the present invention.

Icon: 100-a backlight device; 10-a light source; 20-a light bar; 30-a fresnel lens; 40-a light-guiding shell; 41-a first snap-in part; 50-a display screen; 60-mounting the housing; 61-a second clamping part; 62-a first spring plate; 63-a fourth clamping part; 70-pressing a screen frame; 71-a third snap-fit portion; 72-a second spring plate; 80-a flexible support sheet; 90-a polarizing film; 110-a thermally conductive film; 120-diffusion membrane.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be internal to both elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

The embodiment provides a head-up display (not shown in the figure), which comprises a shell, and a backlight device 100, an imaging device (not shown in the figure), a primary reflector (not shown in the figure) and a secondary reflector (not shown in the figure) which are arranged in the shell, so that important driving information such as speed, navigation, steering and oil consumption of an automobile is projected to a windshield through the head-up display, safe driving is guaranteed, and driving experience is improved.

As shown in fig. 1 and fig. 3, optionally, the material of the casing is a heat conducting metal, the backlight device 100 includes a heat conducting film 110, and the heat conducting film 110 is sandwiched between the light source 10 of the backlight device 100 and the casing, so that heat generated by the light source 10 is conducted to the casing through the heat conducting film 110, and then the heat dissipation is directly realized through the casing. Compared with the prior art in which heat is dissipated through a heat sink, the housing provided in this embodiment uses a heat conductive metal and performs heat transfer through the heat conductive film 110, so that the structure of the backlight device 100 is simpler, and the volume of the head-up display is smaller.

It should be noted that, the specific structures of the housing, the imaging device, the primary mirror and the secondary mirror described above should be reasonably selected and designed by those skilled in the art according to the head-up display in the prior art, and the specific structures of the housing, the imaging device, the primary mirror and the secondary mirror are not explained in too much.

This application is mainly comparatively complicated to on-vehicle HUD's backlight device 100 structure among the prior art, and production and processing is comparatively difficult, leads to the lower problem of on-vehicle HUD's production efficiency to improve to make backlight device 100 have simple structure's advantage, can effectively improve on-vehicle HUD's production efficiency.

Specifically, referring to fig. 1 to 3 in combination, the backlight device 100 includes a light source 10, a light guide shell 40 provided with a light bar 20 and a fresnel lens 30, and an installation shell 60 provided with a display screen 50, the light source 10, the light guide shell 40, and the installation shell 60 are sequentially and fixedly connected, the light source 10, the light bar 20, the fresnel lens 30, and the display screen 50 are sequentially arranged along a light path, a reflective layer is disposed in the light bar 20, and light emitted by the light source 10 passes through the light bar 20, is reflected to the fresnel lens 30, and is projected to the display screen 50. This backlight device 100 has simple structure's advantage, can effectively improve on-vehicle HUD's production efficiency.

First, as shown in fig. 3, the light bar 20 and the fresnel lens 30 are fixedly installed in the light guide shell 40, as shown in fig. 2, the display screen 50 is fixedly installed in the installation shell 60, as shown in fig. 1, the light source 10, the light guide shell 40, and the installation shell 60 are sequentially and fixedly connected, the light source 10, the light bar 20, the fresnel lens 30, and the display screen 50 are sequentially arranged along a light path, and a reflective layer is arranged in the light bar 20, so that light emitted by the light source 10 can pass through the light bar 20 and then be reflected to the fresnel lens 30, and then pass through the fresnel lens 30 and then be projected to the display screen 50. Compare in on-vehicle HUD among the prior art, the backlight device 100 that this embodiment provided structure is simple compact more, can effectively improve on-vehicle HUD's production efficiency.

Secondly, a reflective layer is provided in the light rod 20, so that the light emitted from the light source 10 can be reflected to the fresnel lens 30 through the reflective layer after entering the light rod 20, thereby improving the illumination intensity and uniformity of the light, and the backlight device 100 provided by this embodiment not only has the advantage of simple structure, but also has the advantage of better illumination intensity and uniformity. It should be noted that the specific structure of the light bar 20 can be reasonably selected and designed with reference to the head-up display in the prior art, and the specific structure of the light bar 20 is not explained herein too much. Illustratively, the light bar 20 may have a chamfered frustum structure.

Thirdly, as shown in fig. 2, optionally, the backlight device 100 further includes a diffusion film 120, the diffusion film 120 is disposed in the mounting case 60 and located between the fresnel lens 30 and the display screen 50, so that the light emitted from the light source 10 can be projected onto the display screen 50 through the diffusion film 120 after sequentially passing through the light bar 20 and the fresnel lens 30, and thus the light with larger area, better uniformity and more stable chromaticity is obtained, and the usability of the vehicle-mounted HUD is effectively improved. Of course, in other embodiments, the diffusion film 120 may be replaced by a diffusion sheet, and the diffusion film 120 provided in this embodiment has a thinner thickness compared to the diffusion sheet, so that the backlight device 100 has a simpler structure, and the volume of the head-up display is smaller.

Fourth, optionally, the light source 10 is an aluminum-based lamp panel. A common single-sided aluminum-based lamp panel is composed of three layers, namely a circuit layer (copper foil), an insulating layer and a metal base layer. The power device is attached to the circuit layer, heat generated when the power device operates is quickly conducted to the metal base layer through the insulating layer, and then the heat is transmitted out through the metal base layer, so that heat dissipation of the power device is achieved. Wherein, the metal basic unit of aluminium base lamp plate contains aluminium base board, copper base plate and iron base plate, because aluminium base board has good heat conductivity, electrical insulation performance and machining performance, consequently, chooses for use the light source 10 of aluminium base lamp plate to have good heat dissipation function to improve on-vehicle HUD's performance.

Fifth, the display screen 50 is optionally a thin film transistor type liquid crystal display screen 50. The Thin film transistor liquid crystal display (TFT-LCD) 50 refers to a liquid crystal display in which each liquid crystal pixel point is driven by a Thin film transistor integrated behind the liquid crystal display, so that 50 screens of information of the display screen with high speed, high brightness and high contrast can be achieved, the service performance of the vehicle-mounted HUD can be further improved, and the image quality can be remarkably improved.

As described above, the backlight device 100 includes the light source 10, the light guide shell 40 provided with the light bar 20 and the fresnel lens 30, and the mounting shell 60 provided with the display screen 50, the light source 10, the light guide shell 40, and the mounting shell 60 are sequentially and fixedly connected, the light source 10, the light bar 20, the fresnel lens 30, and the display screen 50 are sequentially arranged along the light path, a reflective layer is provided in the light bar 20, and the light emitted by the light source 10 passes through the light bar 20, is reflected to the fresnel lens 30, and is projected to the display screen 50. The light bar 20 and the Fresnel lens 30 are fixedly installed in the light guide shell 40, the display screen 50 is fixedly installed in the installation shell 60, the light source 10, the light guide shell 40 and the installation shell 60 are sequentially and fixedly connected, the light source 10, the light bar 20, the Fresnel lens 30 and the display screen 50 are sequentially arranged along a light path, and a reflection layer is arranged in the light bar 20, so that light rays emitted by the light source 10 can be reflected to the Fresnel lens 30 through the light bar 20 and then projected to the display screen 50 through the Fresnel lens 30. Compare in on-vehicle HUD among the prior art, the backlight device 100 that this embodiment provided structure is simple compact more, can effectively improve on-vehicle HUD's production efficiency.

In this embodiment, the light guide shell 40 is provided with a first clamping portion 41, the installation shell 60 is provided with a second clamping portion 61, and the first clamping portion 41 is clamped with the second clamping portion 61, so that the light guide shell 40 is clamped with the installation shell 60.

It should be noted that, as shown in fig. 1 to fig. 3, in the present embodiment, the first fastening portion 41 is a protrusion, the second fastening portion 61 is a through hole, and the number, shape and size of the protrusion are adapted to the number, shape and size of the through hole, so that the protrusion can be accommodated in the through hole, thereby realizing the fixed connection between the light guide shell 40 and the mounting shell 60. Of course, in other embodiments, the first engaging portion 41 is a through hole, and the second engaging portion 61 is a protrusion, so that the light guide shell 40 and the mounting shell 60 can be fixedly connected. The mode of joint that this embodiment provided compares in prior art threaded connection's mode, has avoided dismouting in-process screw to lose the problem that is difficult for saving easily, has still saved on-vehicle HUD's manufacturing cost simultaneously.

It should be noted that the number of the first clamping portion 41 and the second clamping portion 61 can be multiple, the shape of the first clamping portion 41 and the shape of the second clamping portion 61 can be multiple shapes such as square, circular, triangular, etc., and only the first clamping portion 41 and the second clamping portion 61 can be adapted to each other. For example, as shown in fig. 1 to fig. 3, in the present embodiment, the number of the first clamping portions 41 is four, two of the first clamping portions 41 are disposed on the top of the mounting shell 60, and the other two first clamping portions 41 are disposed on the left and right sides of the mounting shell 60 respectively. Since the bottom of the mounting case 60 has an opening, the size of the first clamping portion 41 at the top of the mounting case 60 can be properly larger without affecting the assembly of the mounting case 60 and the light guide case 40, and the size of the first clamping portion 41 at the left and right sides of the mounting case 60 can be properly smaller to avoid affecting the assembly of the mounting case 60 and the light guide case 40.

Referring to fig. 4 and fig. 5, optionally, a mounting groove for accommodating the display screen 50 is provided in the mounting shell 60, the mounting groove includes four side walls connected end to end in the mounting shell 60, two adjacent side walls of the mounting groove are respectively provided with a first elastic sheet 62, and the first elastic sheet 62 and the side walls of the mounting groove arranged oppositely cooperate to fix the display screen 50. Compare in the mode of fixing display screen 50 through the hard extrusion of screw among the prior art, the elastic deformation's through the shell fragment mode of fixing display screen 50 that this embodiment provided not only can fix display screen 50 steadily, can also avoid display screen 50 impaired.

For example, as shown in fig. 4 and 5, in the present embodiment, the first elastic sheet 62 located at the bottom of the mounting groove cooperates with the side wall of the mounting groove located at the top of the mounting groove to fix the display screen 50 along the first direction, and the first elastic sheet 62 located at the right side of the mounting groove cooperates with the side wall of the mounting groove located at the left side of the mounting groove to fix the display screen 50 along the second direction.

Specifically, in the present embodiment, the first elastic sheet 62 is a Z-shaped structure, one end of the Z-shaped structure is fixedly connected to the side wall of the mounting groove, and the other end of the Z-shaped structure is used for abutting against the side wall of the display screen 50. The Z-shaped structure includes two support arms and a connecting arm connecting the two support arms, for example, in the present embodiment, the included angle between the support arm and the connecting arm is 90 °, and a person skilled in the art should be able to reasonably select and design the included angle between the support arm and the connecting arm according to actual situations, and is not limited here.

Further, as shown in fig. 4, in the present embodiment, the backlight device 100 further includes a flexible supporting sheet 80, and the flexible supporting sheet 80 is sandwiched between the bottom wall of the mounting groove and the edge of the display screen 50 to prevent the display screen 50 from being damaged.

Referring to fig. 2 and fig. 6, in the present embodiment, the backlight device 100 further includes a pressing bezel 70, a third engaging portion 71 is disposed on the pressing bezel 70, a fourth engaging portion 63 is disposed in the mounting case 60, and the third engaging portion 71 is engaged with the fourth engaging portion 63, so that the pressing bezel 70 is engaged with the mounting case 60.

It should be noted that, as shown in fig. 2 and fig. 6, in the present embodiment, the third fastening portion 71 is a through hole, the fourth fastening portion 63 is a protrusion, and the number, shape and size of the through hole are adapted to the number, shape and size of the protrusion, so that the protrusion can be accommodated in the through hole, thereby realizing the fixed connection between the bezel 70 and the mounting housing 60. Of course, in other embodiments, the first engaging portion 41 is a protrusion, and the second engaging portion 61 is a through hole, so that the light guide shell 40 and the mounting shell 60 can be fixedly connected.

Further, as shown in fig. 2 and fig. 6, in the present embodiment, a second elastic sheet 72 is disposed on the screen pressing frame 70, and the second elastic sheet 72 is used for abutting against an edge of the display screen 50, so that the display screen 50 is fixed along the third direction by the cooperation between the second elastic sheet 72 and the bottom wall of the mounting groove. The first direction, the second direction and the third direction are mutually perpendicular in pairs. The position of the second elastic sheet 72 may correspond to the position of the flexible supporting sheet 80, so that the position of the display screen 50, which is acted by the second elastic sheet 72, can be prevented from being damaged. Illustratively, the second elastic sheet 72 is in a V-shaped structure or a U-shaped structure, and is abutted against the surface of the edge of the display screen 50 through a connecting portion of the V-shaped structure or the U-shaped structure.

Because the external solar ray may irradiate the surface of the display screen 50, or the external solar ray is reversely reflected to the surface of the display screen 50 along the light path from the imaging device, on one hand, the surface temperature of the display screen 50 is increased and exceeds the working temperature of the display screen 50, so that the display screen 50 is burnt out, on the other hand, the external solar ray irradiates the surface of the display screen 50, the display screen 50 projects the solar ray on the imaging along the light path of the display screen 50, so that the driver sees the solar white light, and the sight line of the driver is influenced. Therefore, as shown in fig. 1 and fig. 2, in the present embodiment, the backlight device 100 further includes a polarization film 90, and the polarization film 90 is disposed in the mounting case 60 and located on a side surface of the display screen 50 away from the fresnel lens 30, so as to avoid the above problem.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a backlight device, its characterized in that, includes the light source, is provided with the leaded light shell of optical wand and fresnel lens and is provided with the installation shell of display screen, the light source the leaded light shell the installation shell is fixed connection in proper order, the light source the optical wand fresnel lens with the display screen sets gradually along the light path, be provided with the reflector layer in the optical wand, the light that the light source sent passes through after the optical wand reflection extremely throw behind the fresnel lens extremely the display screen.

2. The backlight device according to claim 1, wherein the light guide shell is provided with a first clamping portion, the mounting shell is provided with a second clamping portion, and the first clamping portion is clamped with the second clamping portion so as to clamp the light guide shell with the mounting shell.

3. The backlight device according to claim 1, wherein the mounting casing is provided with a mounting groove for accommodating the display screen, the mounting groove comprises four side walls connected end to end in an annular shape in the mounting casing, two adjacent side walls of the mounting groove are respectively provided with a first elastic sheet, and the first elastic sheets and the side walls of the mounting groove arranged oppositely cooperate to fix the display screen.

4. The backlight device according to claim 3, wherein the first elastic sheet is of a Z-shaped structure, one end of the Z-shaped structure is fixedly connected with the side wall of the mounting groove, and the other end of the Z-shaped structure is used for abutting against the side wall of the display screen.

5. The backlight device according to claim 3, further comprising a pressing frame, wherein a third clamping portion is disposed on the pressing frame, a fourth clamping portion is disposed in the mounting housing, and the third clamping portion is clamped with the fourth clamping portion, so that the pressing frame is clamped with the mounting housing.

6. The backlight device as claimed in claim 5, wherein a second resilient sheet is disposed on the bezel, and the second resilient sheet is configured to abut against an edge of the display screen.

7. The backlight device according to claim 5 or 6, further comprising a flexible support sheet interposed between a bottom wall of the mounting groove and an edge of the display screen.

8. The backlight device according to claim 1, further comprising a polarizing film disposed in the mounting case on a surface of the display screen remote from the fresnel lens.

9. A head-up display comprising a housing and the backlight of any one of claims 1-8 disposed within the housing.

10. The heads-up display of claim 9 wherein the housing is made of a thermally conductive metal, the backlight further comprising a thermally conductive film sandwiched between the light source of the backlight and the housing.

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