CN113741038A - Display system, head-up display and vehicle - Google Patents
Display system, head-up display and vehicle Download PDFInfo
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- CN113741038A CN113741038A CN202111108699.XA CN202111108699A CN113741038A CN 113741038 A CN113741038 A CN 113741038A CN 202111108699 A CN202111108699 A CN 202111108699A CN 113741038 A CN113741038 A CN 113741038A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B27/0103—Head-up displays characterised by optical features comprising holographic elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
Abstract
The embodiment of the invention relates to the technical field of head-up display, in particular to a display system, a head-up display and a vehicle. An embodiment of the present invention provides a display system, a head-up display, and a vehicle, including: the image display system comprises an image source, an optical waveguide and a correction unit, wherein a coupling-in area of the optical waveguide is arranged in the light emergent direction of the image source, the correction unit is arranged in the light emergent direction of a coupling-out area of the optical waveguide, the image source emits light with image information, the light is coupled into a waveguide substrate by the coupling-in area, the light is totally reflected and transmitted to the coupling-out area in the waveguide substrate and then is coupled out to the correction unit by the coupling-out area, the correction unit corrects the light by adjusting the transmission angle and/or the transmission direction of the light, the image quality of display is improved, the display system is subsequently applied to a head-up display, the image quality problem caused by windshield glass can be corrected by the correction unit, and the display quality of images is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of head-up display, in particular to a display system, a head-up display and a vehicle.
Background
A head-up display (HUD) is a vehicle-mounted projection device for enhancing driving assistance safety, and can ensure that a driver can see a lot of driving information such as vehicle speed and navigation on the premise that the sight line does not leave the surrounding environment.
Waveguide-type HUD is a new HUD imaging mode, but the waveguide only has a function of transmitting images, and cannot correct image quality problems caused by windshields, such as image distortion and image distance, so that display quality is low when waveguide-type HUD displays images.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a display system, a head-up display, and a vehicle, in which the display system can correct light and improve display quality.
In a first aspect, one technical solution adopted in the embodiments of the present invention is: there is provided a display system including: an image source for providing light with image information; the optical waveguide comprises a waveguide substrate, and a coupling-in area and a coupling-out area which are arranged on the waveguide substrate, wherein the coupling-in area is arranged in the light-emitting direction of the image source, the coupling-in area is used for coupling the light into the waveguide substrate, the waveguide substrate is used for totally reflecting and propagating the light to the coupling-out area, and the coupling-out area is used for coupling the light out; the correcting unit is arranged in the light-emitting direction of the coupling-out area and used for adjusting the propagation angle and/or the propagation direction of the light.
In some embodiments, the corrective unit comprises at least one shaping lens.
In some embodiments, the shaping lens is a biconcave lens or a plano-concave lens.
In some embodiments, the shaping lens is a biconvex lens or a plano-convex lens.
In some embodiments, the corrective element is one of a holographic grating, a relief grating, or a liquid crystal grating.
In some embodiments, the holographic grating is a transmissive holographic grating.
In some embodiments, the display system further comprises a first reflective unit and/or a second reflective unit; the first reflection unit is arranged in the light emergent direction of the coupling-out area, and the correction unit is arranged in the reflection direction of the first reflection unit; the second reflection unit is arranged in the light emergent direction of the image source, and the coupling-in area is arranged in the reflection direction of the second reflection unit.
In some embodiments, the display system further comprises a shaping unit; the shaping unit is arranged in the light emitting direction of the image source and between the image source and the coupling-in area, and the shaping unit is used for shaping the light.
In a second aspect, an embodiment of the present invention further provides a head up display, including: a windscreen and a display system as claimed in any one of the above first aspects; the windshield is arranged on the light emitting direction of the correcting unit.
In a third aspect, an embodiment of the present invention further provides a vehicle, including: the vehicle-mounted head-up display according to the second aspect.
The beneficial effects of the embodiment of the invention are as follows: in contrast to the state of the art, an embodiment of the present invention provides a display system, a head-up display, and a vehicle, including: the image display system comprises an image source, an optical waveguide and a correction unit, wherein a coupling-in area of the optical waveguide is arranged in the light emergent direction of the image source, the correction unit is arranged in the light emergent direction of a coupling-out area of the optical waveguide, the image source emits light with image information, the light is coupled into a waveguide substrate by the coupling-in area, the light is totally reflected and transmitted to the coupling-out area in the waveguide substrate and then is coupled out to the correction unit by the coupling-out area, the correction unit corrects the light by adjusting the transmission angle and/or the transmission direction of the light, the image quality of display is improved, the display system is subsequently applied to a head-up display, the image quality problem caused by windshield glass can be corrected by the correction unit, and the display quality of images is improved.
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 display system according to an embodiment of the present invention;
FIG. 2 is a block diagram of another display system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a display system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the optical path of FIG. 3;
FIG. 5 is a schematic diagram of another display system provided in an embodiment of the present invention; .
FIG. 6 is a schematic structural diagram of another display system according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of another display system provided in an embodiment of the present invention; .
Fig. 8 is a schematic structural diagram of a fifth display system according to an embodiment of the present invention.
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 invention, but are not intended to limit the invention 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 invention. 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 invention 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.
In a first aspect, an embodiment of the present invention provides a display system, referring to fig. 1, the display system 100 includes: image source 10, optical waveguide 20 and corrective unit 30. Wherein the image source 10 is capable of emitting light with image information for providing the light with image information. The optical waveguide 20 has a waveguide substrate, a coupling-in region and a coupling-out region, both disposed on the waveguide substrate. The coupling-in region is disposed in the light-emitting direction of the image source 10, and is used for coupling light into the waveguide substrate, the waveguide substrate is used for totally reflecting and propagating the light to the coupling-out region, and the coupling-out region is used for coupling out the light. The correcting unit 30 is disposed in the light emitting direction of the coupling-out region, and the correcting unit 30 is used for adjusting the propagation angle and/or the propagation direction of the light.
In the display system, an image source 10 emits light with image information, the light is coupled into a waveguide substrate by an incoupling area, is totally reflected and propagated to an outcoupling area in the waveguide substrate, and is then coupled out to a correction unit 30 by the outcoupling area, the correction unit 30 plays a role of correcting the light by adjusting the propagation angle and/or the propagation direction of the light, namely, by adjusting the wavefront of the light, so that the displayed image quality is improved, and the image quality problem caused by a windshield can be corrected and the image display quality is improved when the correction unit is subsequently applied to a head-up display; moreover, because the correction unit 30 is adopted in the display system, different head-up displays can share the image source 10 and the optical waveguide 20 by replacing the correction unit 30 subsequently, so that the replacement cost is reduced, and the universality of the device is improved.
In some embodiments, the image source may be one of an LCD, an OLED, an LCOS, a DMD, and a Micro-LED for providing image information and outputting light for imaging.
In some embodiments, when the image source is a reflective image source, such as an LCOS, that is, illumination light is required to irradiate on the image source to generate light, referring to fig. 2, the display system further includes an illumination unit 41 and a polarization beam splitter prism 42, wherein the illumination unit 41 is disposed on a first incident surface of the polarization beam splitter prism 42, the image source 10 is disposed on a second incident surface of the polarization beam splitter prism 42, an input region of the optical waveguide 20 is disposed on an output surface of the polarization beam splitter prism 42, the illumination unit 41 is configured to provide an illumination light source for the image source, at this time, the light source generated by the illumination unit 41 passes through the polarization beam splitter prism 42, wherein a dotted arrow in fig. 2 represents S-polarized light, a solid arrow represents P-polarized light, such that the S-polarized light is reflected to the image source 10, and light carrying image information of the image source 10 is reflected to the polarization beam splitter prism in a P-polarized light form, the polarizing beam splitter prism will transmit the P-polarized light into the subsequent optical elements.
In some embodiments, referring to fig. 3, the display system further includes a shaping unit 50. The shaping unit 50 is disposed in the light emitting direction of the image source 10 and between the image source 10 and the coupling region of the optical waveguide 20, and the shaping unit 50 is configured to shape light. Specifically, the shaping unit may be a shaping lens or a combination of a plurality of lenses, and may be set according to actual needs in practical applications, which is not limited herein.
In the display system, referring to fig. 4, light emitted from an image source 10 with image information is shaped by a shaping unit 50, coupled into a waveguide substrate by a coupling-in region, coupled out to a correction unit 30 by a coupling-out region, applied to a head-up display, and corrected by the correction unit 30 to be emitted to a windshield 200, and then reflected to human eyes 300 by the windshield 200. In the display system, the image light emitted from the image source 10 is shaped by the shaping unit 50 and then enters the optical waveguide 20, so that the display quality of the image can be further improved.
In some embodiments, referring to fig. 5, the optical waveguide 20 is a geometric array optical waveguide, which includes a waveguide substrate 21, an incident prism 22 and a selective transmission/reflection film 23, the incident prism 22 is disposed in the light-emitting direction of the image source 10, and the correction unit 30 is disposed in the reflection direction of the selective transmission/reflection film 23. In this display system, light from an image source 10 can be coupled into a geometric array light guide 20 through an entrance prism 22 and finally reflected to a corrective unit 30 through a selectively transparent reflective film 23 inside the light guide 20.
In other embodiments, referring to fig. 6, the optical waveguide 20 is a grating optical waveguide, which includes a waveguide substrate 21, an incoupling grating 22 and an outcoupling grating 23, the incoupling grating 22 is disposed in the light-exiting direction of the image source 10, and the correction unit 30 is disposed in the light-exiting direction of the outcoupling grating 23. In the display system, the coupling-in grating 22 can couple in the light emitted from the image source 10 into the light guide 20, and through the expansion and coupling-out of the coupling-out grating 23, the light can be finally coupled out by the coupling-out grating 23 to the correcting unit 30.
In some of these embodiments, the corrective unit includes at least one shaping lens. The shaping lens comprises at least one spherical surface and/or at least one aspherical surface. The surface curvature of each shaping lens is designed to meet the required wavefront adjustment function, so that the propagation angle and/or the propagation direction of light can be corrected, and the display quality of the displayed image is improved. The shaping lens may be made of a glass lens or a resin lens, and is not limited herein. In practical applications, the surface curvature of the shaping lens can be set according to practical requirements, and is not limited herein.
In some embodiments, referring to fig. 3, the shaping lens 30 is a biconcave lens, or, in some embodiments, a plano-concave lens. The focal lengths of the biconcave lens and the plano-concave lens are both negative, and both the biconcave lens and the plano-concave lens can make the parallel incident light rays diverge outward, so that, referring to fig. 4, the position of the image point B observed by the human eye 300 can be far away from the windshield 200. In other embodiments, the shaping lens is a biconvex lens or a plano-convex lens. The focal lengths of the lenticular lens and the plano-convex lens are both positive, and both can make the parallel incident light converge inward, even if the light converges, so that, referring to fig. 4, the position of the image point B observed by the human eye 300 can be made to be close to the windshield 200.
In some embodiments, referring to fig. 7, the correcting unit 30 has a grating structure. Specifically, the grating structure is one of a holographic grating, a relief grating or a liquid crystal grating. In the embodiment shown in the figure, the holographic grating is a transmissive holographic grating. The holographic grating, the embossed grating and the liquid crystal grating are designed in surface structures, the phase of each grating is designed, and the required function of adjusting the wavefront is met, so that the propagation angle and/or the propagation direction of light can be adjusted, the light correction is realized, the holographic grating, the embossed grating and the liquid crystal grating are finally applied to a head-up display, and the display quality of images can be improved.
In some embodiments, the display system further includes a first reflection unit and/or a second reflection unit, the first reflection unit includes at least one mirror, an incident surface of the first reflection unit is disposed in a light exit direction of the coupling-out region of the optical waveguide, the correction unit is disposed on an exit surface of the first reflection unit, the second reflection unit also includes at least one mirror, the second reflection unit is disposed in the light exit direction of the image source, and the coupling-in region of the optical waveguide is disposed in a reflection direction of the second reflection unit.
Specifically, in some embodiments, referring to fig. 8, the first reflection unit includes a first reflection mirror 61, a second reflection mirror 62 and a third reflection mirror 63, wherein the first reflection mirror 61 is disposed in the light outgoing direction of the coupling-out region of the optical waveguide 20, the second reflection mirror 62 is disposed in the light reflecting direction of the first reflection mirror 61, the third reflection mirror 63 is disposed in the light reflecting direction of the second reflection mirror 62, and the correction unit 30 is disposed in the light reflecting direction of the third reflection mirror 63, wherein the first reflection mirror 61 and the second reflection mirror 62 are plane reflection mirrors or curved reflection mirrors, the third reflection mirror 63 is a concave reflection mirror, and the light can be further adjusted by designing the curvature of the concave surface of the third reflection mirror 63. In practical applications, the number and types of the mirrors included in the first reflecting unit can be freely set, and the mirrors can be plane mirrors or free-form surface mirrors, which need not be limited in this embodiment.
In some embodiments, the second reflecting unit includes at least one mirror, for example, a fourth mirror, the fourth mirror is disposed in the light emitting direction of the image source, the coupling-in region of the optical waveguide is disposed in the reflecting direction of the fourth mirror, and the fourth mirror may be a flat mirror or a curved mirror. In practical application, the number and the type of the reflecting mirrors included in the second reflecting unit can be freely set.
The reflector in the display system can enlarge an image and extend the display distance, and is applied to a head-up display, the curvature of the reflecting surface of the reflector can be freely designed, the distortion problem caused by a free-form surface windshield can be further corrected, and the display quality of image display is further improved. In addition, the correction unit is adopted in the display system, so that different head-up displays can share an image source, an optical waveguide and a reflection unit by replacing the correction unit when the problem of image deformation caused by different windshields is corrected, the replacement cost is reduced, and the universality of equipment is improved.
In a second aspect, an embodiment of the invention further provides a head-up display, referring to fig. 3, the head-up display includes: a windscreen 200, and a display system as claimed in any one of the above described first aspects. The windshield 200 is disposed in the light exit direction of the correction unit 30. Referring to fig. 4, in the head-up display, an image source 10 emits light with image information, the light is coupled into a waveguide substrate by an in-coupling region of an optical waveguide 20, propagates to an out-coupling region by total reflection in the waveguide substrate, and is then coupled out to a correction unit 30 by the out-coupling region; the correcting unit 30 corrects the light by adjusting the propagation angle and/or the propagation direction of the light; then, the light enters the human eye after being reflected by the windshield 200. In the head-up display, the light is corrected by the correcting unit, so that the image quality problem caused by the windshield can be corrected, and the display quality of the image is improved.
In a third aspect, an embodiment of the present invention further provides a vehicle, where the vehicle includes the vehicle-mounted head-up display described in the second aspect. In a vehicle, an image source emits light with image information, the light is coupled into a waveguide substrate by an coupling-in area, is totally reflected in the waveguide substrate and is transmitted to a coupling-out area, then is coupled out by the coupling-out area to a correction unit, the correction unit can correct the light by adjusting the transmission angle and/or the transmission direction of the light, and then the light enters human eyes after being reflected by a windshield, so that the image quality problem caused by the windshield can be corrected, and the display quality of images is improved.
An embodiment of the present invention provides a display system, a head-up display, and a vehicle, including: the image display system comprises an image source, an optical waveguide and a correction unit, wherein a coupling-in area of the optical waveguide is arranged in the light emergent direction of the image source, the correction unit is arranged in the light emergent direction of a coupling-out area of the optical waveguide, the image source emits light with image information, the light is coupled into a waveguide substrate by the coupling-in area, the light is totally reflected and transmitted to the coupling-out area in the waveguide substrate and then is coupled out to the correction unit by the coupling-out area, the correction unit corrects the light by adjusting the transmission angle and/or the transmission direction of the light, the image quality of display is improved, the display system is subsequently applied to a head-up display, the image quality problem caused by windshield glass can be corrected by the correction unit, and the display quality of images is improved.
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 invention, 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 invention 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 (10)
1. A display system, comprising:
an image source for providing light with image information;
the optical waveguide comprises a waveguide substrate, and a coupling-in area and a coupling-out area which are arranged on the waveguide substrate, wherein the coupling-in area is arranged in the light-emitting direction of the image source, the coupling-in area is used for coupling the light into the waveguide substrate, the waveguide substrate is used for totally reflecting and propagating the light to the coupling-out area, and the coupling-out area is used for coupling the light out;
the correcting unit is arranged in the light-emitting direction of the coupling-out area and used for adjusting the propagation angle and/or the propagation direction of the light.
2. The display system of claim 1, wherein the corrective unit comprises at least one shaping lens.
3. The display system of claim 2, wherein the shaping lens is a biconcave lens or a plano-concave lens.
4. The display system of claim 2, wherein the shaping lens is a lenticular lens or a plano-convex lens.
5. The display system of claim 1, wherein the corrective element is one of a holographic grating, an embossed grating, or a liquid crystal grating.
6. The display system of claim 5, wherein the holographic grating is a transmissive holographic grating.
7. The display system according to any one of claims 1 to 6, wherein the display system further comprises a first reflecting unit and/or a second reflecting unit;
the first reflection unit is arranged in the light emergent direction of the coupling-out area, and the correction unit is arranged in the reflection direction of the first reflection unit;
the second reflection unit is arranged in the light emergent direction of the image source, and the coupling-in area is arranged in the reflection direction of the second reflection unit.
8. The display system according to any one of claims 1 to 6, wherein the display system further comprises a shaping unit;
the shaping unit is arranged in the light emitting direction of the image source and between the image source and the coupling-in area, and the shaping unit is used for shaping the light.
9. A heads-up display, comprising: a windscreen and a display system as claimed in any one of claims 1 to 8 above;
the windshield is arranged on the light emitting direction of the correcting unit.
10. A vehicle comprising the on-board heads-up display of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111108699.XA CN113741038A (en) | 2021-09-22 | 2021-09-22 | Display system, head-up display and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111108699.XA CN113741038A (en) | 2021-09-22 | 2021-09-22 | Display system, head-up display and vehicle |
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| CN113741038A true CN113741038A (en) | 2021-12-03 |
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| CN202111108699.XA Pending CN113741038A (en) | 2021-09-22 | 2021-09-22 | Display system, head-up display and vehicle |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114236850A (en) * | 2021-12-30 | 2022-03-25 | 歌尔股份有限公司 | Head-up display device capable of presenting far and near virtual images |
| CN114236849A (en) * | 2021-12-30 | 2022-03-25 | 歌尔光学科技有限公司 | Head-up display equipment |
| CN114326124A (en) * | 2021-12-30 | 2022-04-12 | 江苏泽景汽车电子股份有限公司 | Image display method and device, head-up display and storage medium |
-
2021
- 2021-09-22 CN CN202111108699.XA patent/CN113741038A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114236850A (en) * | 2021-12-30 | 2022-03-25 | 歌尔股份有限公司 | Head-up display device capable of presenting far and near virtual images |
| CN114236849A (en) * | 2021-12-30 | 2022-03-25 | 歌尔光学科技有限公司 | Head-up display equipment |
| CN114326124A (en) * | 2021-12-30 | 2022-04-12 | 江苏泽景汽车电子股份有限公司 | Image display method and device, head-up display and storage medium |
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