CN215494356U - Backlight device, vehicle-mounted head-up display and vehicle - Google Patents
Backlight device, vehicle-mounted head-up display and vehicle Download PDFInfo
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- CN215494356U CN215494356U CN202121554829.8U CN202121554829U CN215494356U CN 215494356 U CN215494356 U CN 215494356U CN 202121554829 U CN202121554829 U CN 202121554829U CN 215494356 U CN215494356 U CN 215494356U
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Abstract
The embodiment of the utility model relates to the technical field of head-up display, in particular to a backlight device, a vehicle-mounted head-up display and a vehicle. The utility model provides a backlight device, a vehicle-mounted head-up display and a vehicle, which comprise an illumination unit, a light path shaping component, a diffusion unit and a display unit which are sequentially arranged, wherein the illumination unit is used for generating illumination light, and the light path shaping component is used for adjusting the longitudinal angle and the transverse angle of the illumination light; the diffusion unit is used for carrying out uniform light diffusion on the illumination light; the display unit is used for receiving the illumination light and displaying images. The backlight device adjusts the transverse angle and the longitudinal angle of the illuminating light through the light path shaping component, so that the transverse light beam size and the longitudinal light beam size of the illuminating light are adjusted, a transverse and longitudinal efficient and uniform light beam is formed under the action of the diffusion unit and irradiates on the display unit, and the high light utilization rate and the uniform display are ensured.
Description
Technical Field
The embodiment of the utility model relates to the technical field of head-up display, in particular to a backlight device, a vehicle-mounted head-up display and a vehicle.
Background
The vehicle head-up display is a projection optical system based on a graphic generator, and the graphic generator currently selected by the head-up display manufacturers is mainly a Thin film transistor liquid crystal display (TFT-LCD) due to cost considerations.
The direct type backlight with high light utilization rate is the mainstream of the backlight design of the head-up display at present because the brightness required by the head-up display is high and the transmittance of the TFT-LCD is low. However, various defects, such as bright and dark stripes, fresnel stripes, etc., are often present in the current direct-type backlight device, which causes display unevenness, thereby affecting user experience.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model aims to provide a backlight device, a vehicle-mounted head-up display and a vehicle, which are high in light utilization rate and uniform in display.
In a first aspect, one technical solution adopted in the embodiments of the present invention is: provided is a backlight device including:
an illumination unit for providing illumination light;
the light path shaping component is arranged on the light emitting side of the illumination unit and used for adjusting the longitudinal angle and the transverse angle of the illumination light;
the diffusion unit is arranged on the light emitting side of the light path shaping component and is used for carrying out uniform light diffusion on the illumination light;
and the display unit is arranged on the light emitting side of the diffusion unit and used for receiving the illumination light and displaying images.
In some embodiments, the optical path shaping component comprises a shaping lens and a reflective cavity arranged in sequence;
the light-in side of the shaping lens is arranged on the light-out side of the illuminating unit, the diffusion unit is arranged on the light-out side of the reflection cavity, the shaping lens is used for converging the transverse angle of the illuminating light and diffusing the longitudinal angle of the illuminating light, and the reflection cavity is used for converging the longitudinal angle of the illuminating light.
In some embodiments, the shaping lens is a cylindrical lens;
the cylindrical lens is provided with an incident surface and an emergent surface, the incident surface of the cylindrical lens is arranged adjacent to the illumination unit, the emergent surface of the cylindrical lens is arranged adjacent to the reflection cavity, the incident surface of the cylindrical lens is a plane, and the emergent surface of the cylindrical lens is a cylindrical surface.
In some embodiments, the reflective cavity is a curved reflective cavity.
In some embodiments, the diffusion unit is a profiled diffusion membrane.
In some embodiments, the lighting unit is an LED light source.
In some embodiments, the display unit is a TFT-LCD.
In a second aspect, an embodiment of the present invention further provides a vehicle-mounted head-up display, including:
a windshield;
and a backlight as claimed in any one of the first aspect;
the windshield is arranged on the light emitting side of the display unit and used for reflecting the image to human eyes.
In a third aspect, embodiments of the present invention further provide a vehicle, including the vehicle-mounted head-up display according to the second aspect.
Compared with the prior art, the utility model has the beneficial effects that: the utility model provides a backlight device, a vehicle-mounted head-up display and a vehicle, which are different from the prior art, and comprise an illumination unit, a light path shaping component, a diffusion unit and a display unit which are sequentially arranged, wherein the illumination unit is used for generating illumination light, and the light path shaping component is used for adjusting the longitudinal angle and the transverse angle of the illumination light; the diffusion unit is used for carrying out uniform light diffusion on the illumination light; the display unit is used for receiving the illumination light and displaying images. The backlight device adjusts the transverse angle and the longitudinal angle of the illuminating light through the light path shaping component, so that the transverse light beam size and the longitudinal light beam size of the illuminating light are adjusted, a transverse and longitudinal efficient and uniform light beam is formed under the action of the diffusion unit and irradiates on the display unit, and the high light utilization rate and the uniform display are ensured.
Drawings
One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.
Fig. 1 is a schematic structural block diagram of a backlight device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a backlight device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a transverse optical path of the shaping lens of FIG. 2 when the shaping lens is a cylindrical lens;
FIG. 4 is a schematic diagram of the longitudinal optical path of the shaping lens of FIG. 2 when the shaping lens is a cylindrical lens;
FIG. 5 is a schematic longitudinal cross-sectional view of a curved reflective cavity provided in accordance with an embodiment of the present invention;
FIG. 6 is a schematic longitudinal optical path diagram of the reflective cavity of FIG. 2 when the reflective cavity is a curved reflective cavity;
fig. 7 is a schematic diagram of an optical path in fig. 2.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the utility model, but are not intended to limit the utility model in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the utility model. All falling within the scope of the present invention.
In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that, if not conflicted, the various features of the embodiments of the utility model may be combined with each other within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions.
At present, in the straight following formula backlight unit to TFT-LCD, two kinds of structures are often adopted, the first kind of structure adopts trapezoidal chamber and fresnel lens to carry out the plastic to the LED light source, then carry out even light diffusion to the light after the plastic, but can lead to the fresnel line, the second kind of structure adopts TIR prism and fly's eye lens to carry out the plastic to the light path, then carry out even light diffusion to the light after the plastic, but can produce light and shade stripe, to this, in the straight following formula backlight unit that uses TFT-LCD, how to guarantee that light utilization is high and show evenly is the problem that urgently need to be solved.
In order to solve the above-mentioned problems, embodiments of the present invention provide a backlight device, a vehicle-mounted head-up display, and a vehicle, which can ensure high light utilization rate and uniform display.
In a first aspect, an embodiment of the present invention provides a backlight device, and referring to fig. 1, the backlight device 10 includes an illumination unit 1, an optical path shaping component 2, a diffusion unit 3, and a display unit 4, which are sequentially disposed. The illumination unit 1 is used to provide illumination light. The light path shaping component 2 is arranged on the light emitting side of the illumination unit 1, and the light path shaping component 2 is used for adjusting the longitudinal angle and the transverse angle of the illumination light. The diffusion unit 3 is arranged on the light emitting side of the light path shaping component 2, and the diffusion unit 3 is used for carrying out uniform light diffusion on the illumination light. The display unit 4 is arranged on the light emitting side of the diffusion unit 3, and the display unit 4 is used for receiving the illumination light and displaying images.
In the backlight device, after illumination light emitted by an illumination unit 1 passes through a light path shaping component 2, the longitudinal angle and the transverse angle of the illumination light are changed, namely the size of a longitudinal light beam and the size of a transverse light beam are changed, after uniform light of a diffusion unit 3 is diffused, the uniform light is irradiated on a display unit 4, and the display unit 4 displays images. In the backlight device, the longitudinal angle and the transverse angle of the illuminating light are respectively adjusted through the light path shaping component 2, and then a transverse and longitudinal efficient uniform light emitting beam is formed under the action of the diffusion unit 3, so that the high light utilization rate and the uniform display can be ensured.
In particular, in some of the embodiments, the lighting unit is an LED light source. In practical applications, the illumination unit may also be other light sources with smaller light emitting areas, and the limitation in this embodiment is not required here.
In some of these embodiments, the display unit is a TFT-LCD. In practical applications, the display unit may also be any other suitable backlight display unit that can display an image only by receiving illumination light, and the limitation in this embodiment is not required herein.
In some embodiments, referring to fig. 2, the optical path shaping component 2 includes a shaping lens 21 and a reflective cavity 22, which are sequentially disposed. The light-incoming side of the shaping lens 21 is arranged on the light-outgoing side of the lighting unit 1, the diffusion unit 3 is arranged on the light-outgoing side of the reflection cavity 22, the shaping lens 21 is used for converging the transverse angle of the lighting rays and diffusing the longitudinal angle of the lighting rays, and the reflection cavity 22 is used for converging the longitudinal angle of the lighting rays.
In some of these embodiments, the shaping lens is a cylindrical lens. Specifically, referring to fig. 3, the cylindrical lens 21 includes an incident surface 211 and an exit surface 212, where the incident surface 211 of the cylindrical lens 21 is disposed near the light exit side of the illumination unit 1, the exit surface of the cylindrical lens is disposed near the light entrance side of the reflection cavity, the incident surface 211 of the cylindrical lens 21 is a plane, and the exit surface 212 of the cylindrical lens 21 is a cylinder. Referring to fig. 3, after the illumination light emitted from the illumination unit 1 passes through the cylindrical lens 21, the transverse angle of the light is converged once, that is, the illumination light is converged in the transverse direction, and referring to fig. 4, after the illumination light passes through the cylindrical lens 21, the light is refracted once in the longitudinal direction, so that the longitudinal angle of the illumination light is diffused at this time. In practical applications, the lateral light utilization rate of the illumination light can be effectively adjusted by adjusting the distance between the illumination unit 1 and the cylindrical lens 21, the cylindrical curvature of the cylindrical lens 21 and the thickness of the cylindrical lens 21.
In some of the embodiments, the reflective cavity is a curved reflective cavity, that is, the reflective surface of the reflective cavity is a curved surface. Specifically, referring to fig. 5, the curved reflective cavity is cup-shaped and has a light inlet 221, a first light outlet 222, a second light outlet 223, a first reflective surface 224 and a second reflective surface 225, wherein referring to fig. 2 and fig. 5, the light inlet of the curved reflective cavity is disposed adjacent to the shaping lens, and both the first light outlet and the second light outlet of the curved reflective cavity are disposed adjacent to the diffusion unit. The first reflecting surface 224 is a first parabolic curved surface, the second reflecting surface 225 is a second parabolic curved surface, and the first parabolic curved surface may be the same as or different from the second parabolic curved surface. Referring to fig. 6, after the illumination light passes through the curved reflective cavity 22, the illumination light is converged once in the longitudinal direction under the action of the curved reflective cavity, that is, the longitudinal angle of the illumination light is converged. At the moment, the size of the light beam can be adjusted by adjusting the length of the curved surface reflection cavity, so that the requirements of different display area sizes are met, and in addition, the light angle can be adjusted by adjusting the curved surface equation of the first reflection surface and the second reflection surface. In practical applications, the number of the light outlets can be set according to actual needs, and the first reflecting surface and the second reflecting surface can also be other curved surfaces, which is not limited by the limitation of the embodiment.
In some of the embodiments, the diffusion unit is a special-shaped diffusion film, and the special-shaped diffusion film has different diffusion effects on transverse light beams and longitudinal light beams. In practical applications, a diffusion film having the same effect of diffusing the transverse light beam and the longitudinal light beam may also be used, and is not limited herein.
The light path of the backlight device provided by the present invention is described in detail with the embodiment shown in fig. 2. The lighting unit 1 is an LED light source, the shaping lens 21 is a cylindrical lens, the reflecting cavity 22 is a parabolic curved surface reflecting cavity, the diffusion unit 3 is a special-shaped diffusion film, and the display unit 4 is a TFT-LCD.
Referring to fig. 2 and 7, in the backlight device, the illumination light emitted from the LED light source passes through the cylindrical lens 21, the parabolic curved reflective cavity 22, and the irregular-shaped diffusion film 3 in sequence, so as to form a uniform light beam with high light utilization rate to be irradiated on the TFT-LCD. Firstly, the illumination light generated by the LED light source 1 passes through the cylindrical lens 21, and then undergoes primary light convergence in the transverse direction and primary refraction in the longitudinal direction, and then the illumination light undergoes primary light convergence in the longitudinal direction under the action of the curved surface reflection cavity 22, and finally, a uniform light emitting beam is formed under the action of the special-shaped diffusion film 3.
In the backlight device, firstly, the size of the transverse beam of the illumination light can be adjusted through the cylindrical lens 21, and the transverse beam with high light utilization rate and uniform illumination brightness can be formed under the diffusion of the special-shaped diffusion film 3; in addition, the size of the longitudinal light beam of the illumination light can be adjusted through the curved surface equation of the reflecting surface of the curved surface reflecting cavity 22, and the longitudinal light beam with high light utilization rate and uniform illumination brightness can be formed under the diffusion of the special-shaped diffusion film 3. The backlight device can ensure that the utilization rate of the illumination light finally irradiated on the TFT-LCD is high and the display is uniform under the combined action of the two modes; in addition, in this backlight device, a trapezoidal reflection cavity, a fresnel mirror, a TIR prism, and a fly-eye lens are not used, so that the finally presented image is free from display defects such as fresnel stripes, bright and dark stripes, and the like.
In a second aspect, an embodiment of the present invention provides a vehicle-mounted head-up display, where the vehicle-mounted head-up display includes: a windshield; and a backlight as described in any one of the above first aspects; the windshield is arranged on the light emitting side of the display unit and used for reflecting the image to human eyes. In the vehicle-mounted head-up display, after illumination light emitted by an illumination unit passes through a light path shaping component, the longitudinal angle and the transverse angle of the illumination light are changed, namely the size of a longitudinal light beam and the size of a transverse light beam are changed, the illumination light irradiates a display unit after being diffused by uniform light of a diffusion unit, the display unit displays images, and a windshield reflects the images to human eyes. In the vehicle-mounted head-up display, the longitudinal angle and the transverse angle of the illuminating light are respectively adjusted through the light path shaping component, and then a transverse and longitudinal efficient uniform light emitting beam is formed under the action of the diffusion unit, so that the high light utilization rate and the uniform display can be ensured.
In a third aspect, embodiments of the present invention provide a vehicle including an onboard heads-up display as described in the second aspect above. In the vehicle, after illumination light emitted by the illumination unit passes through the light path shaping component, the longitudinal angle and the transverse angle of the illumination light are changed, namely the size of a longitudinal light beam and the size of a transverse light beam are changed, after uniform light diffusion of the diffusion unit, the illumination light irradiates the display unit, and the display unit displays images. In this vehicle, adjust the vertical angle and the horizontal angle of illumination light respectively through light path plastic subassembly, then form a horizontal, vertical high-efficient even light-emitting beam through the effect of diffusion unit again to can guarantee that light utilization rate is high, just show evenly.
The utility model provides a backlight device, a vehicle-mounted head-up display and a vehicle, which comprise an illumination unit, a light path shaping component, a diffusion unit and a display unit which are sequentially arranged, wherein the illumination unit is used for generating illumination light, and the light path shaping component is used for adjusting the longitudinal angle and the transverse angle of the illumination light; the diffusion unit is used for carrying out uniform light diffusion on the illumination light; the display unit is used for receiving the illumination light and displaying images. The backlight device adjusts the transverse angle and the longitudinal angle of the illuminating light through the light path shaping component, so that the transverse light beam size and the longitudinal light beam size of the illuminating light are adjusted, a transverse and longitudinal efficient and uniform light beam is formed under the action of the diffusion unit and irradiates on the display unit, and the high light utilization rate and the uniform display are ensured.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the utility model, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the utility model as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A backlight apparatus, comprising:
an illumination unit for providing illumination light;
the light path shaping component is arranged on the light emitting side of the illumination unit and used for adjusting the longitudinal angle and the transverse angle of the illumination light;
the diffusion unit is arranged on the light emitting side of the light path shaping component and is used for carrying out uniform light diffusion on the illumination light;
and the display unit is arranged on the light emitting side of the diffusion unit and used for receiving the illumination light and displaying images.
2. The backlight device according to claim 1, wherein the light path shaping member comprises a shaping lens and a reflective cavity arranged in this order;
the light-in side of the shaping lens is arranged on the light-out side of the illuminating unit, the diffusion unit is arranged on the light-out side of the reflection cavity, the shaping lens is used for converging the transverse angle of the illuminating light and diffusing the longitudinal angle of the illuminating light, and the reflection cavity is used for converging the longitudinal angle of the illuminating light.
3. The backlight device according to claim 2, wherein the shaping lens is a cylindrical lens;
the cylindrical lens is provided with an incident surface and an emergent surface, the incident surface of the cylindrical lens is arranged adjacent to the illumination unit, the emergent surface of the cylindrical lens is arranged adjacent to the reflection cavity, the incident surface of the cylindrical lens is a plane, and the emergent surface of the cylindrical lens is a cylindrical surface.
4. The backlight of claim 2, wherein the reflective cavity is a curved reflective cavity.
5. The backlight device according to claim 2, wherein the diffusion unit is a profile diffusion film.
6. The backlight device according to any one of claims 1 to 5, wherein the illumination unit is an LED light source.
7. The backlight device according to any one of claims 1 to 5, wherein the display unit is a TFT-LCD.
8. An on-vehicle heads-up display, comprising:
a windshield;
and a backlight as claimed in any one of claims 1 to 7;
the windshield is arranged on the light emitting side of the display unit and used for reflecting the image to human eyes.
9. A vehicle comprising the on-board heads-up display of claim 8.
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| CN202121554829.8U CN215494356U (en) | 2021-07-08 | 2021-07-08 | Backlight device, vehicle-mounted head-up display and vehicle |
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| CN202121554829.8U CN215494356U (en) | 2021-07-08 | 2021-07-08 | Backlight device, vehicle-mounted head-up display and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113534465A (en) * | 2021-07-08 | 2021-10-22 | 合肥疆程技术有限公司 | Backlight system, vehicle-mounted head-up display and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113534465A (en) * | 2021-07-08 | 2021-10-22 | 合肥疆程技术有限公司 | Backlight system, vehicle-mounted head-up display and vehicle |
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