CN116819718A

CN116819718A - Projection lens, projection device, display device and vehicle

Info

Publication number: CN116819718A
Application number: CN202210276680.4A
Authority: CN
Inventors: 方志方; 赵晗
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2023-09-29
Also published as: WO2023179246A1

Abstract

The application provides a projection lens, a projection device, a display device and a vehicle. The projection lens comprises a first lens group, a diaphragm and a second lens group which are sequentially arranged along a projection light path. The first lens group is used for refracting the first image light and emitting the second image light to the diaphragm. The diaphragm is used for transmitting the second image light. The second lens group is used for refracting the second image light and emitting third image light. The first image light, the second image light and the third image light respectively bear a first image, a second image and a third image, and the third image is obtained by amplifying the long side and the short side of the first image with different magnifications. The projection lens provided by the application can realize different magnifications of long and short sides of an image, and can improve the utilization efficiency of image light and reduce the loss of the image light when being applied to a projection device.

Description

Projection lens, projection device, display device and vehicle

Technical Field

The present application relates to the technical field of intelligent vehicles, and more particularly, to a projection lens, a projection device, a display device, and a vehicle.

Background

Currently, the aspect ratio of the frames of Head Up Displays (HUDs) is typically 10:4, 12:4, or 13:5. To adapt the aspect ratio requirements of the HUD frame, part of the illumination light is often blocked within the image generating unit (picture generation unit, PGU) or the image is blocked at the diffuser screen. But this measure tends to result in a loss of brightness. Therefore, how to improve the utilization efficiency of image light in HUD, reduce the loss of image light, and further generate HUD images with high brightness is a problem to be solved.

Disclosure of Invention

The application provides a projection lens, a projection device, a display device and a vehicle. The projection lens provided by the application can be applied to the HUD, and can amplify the length and width of the image in different proportions, so that the image which is required by the aspect ratio and is suitable for the drawing of the HUD is prevented from being generated by shielding the image light, and the brightness of the HUD image and the light transmission efficiency and resolution in the HUD system are improved.

In a first aspect, an embodiment of the present application provides a projection lens. The projection lens includes: the first lens group, the diaphragm and the second lens group are sequentially arranged along the projection light path. The first lens group is used for refracting the first image light and emitting the second image light to the diaphragm. The diaphragm is used for transmitting the second image light. The second lens group is used for refracting the second image light and emitting third image light. The first image light bears a first image, the second image light bears a second image, the third image light bears a third image, and the third image is obtained by amplifying the long side and the short side of the first image with different amplification factors.

Based on the scheme provided by the application, the projection lens provided by the application can realize different magnifications for the long side and the short side of the input image, and can avoid shielding the image light to realize the effect of different magnifications for the length and the width of the image.

With reference to the first aspect, in certain implementations of the first aspect, focal lengths of the first lens group and the second lens group are positive.

With reference to the first aspect, in certain implementation manners of the first aspect, the first lens group is sequentially disposed along a projection optical path: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens comprises a first convex spherical surface and a second concave spherical surface, and the focal power of the first lens is negative. The second lens comprises a third convex cylindrical surface and a fourth concave cylindrical surface, and symmetry axes of the third convex cylindrical surface and the fourth concave cylindrical surface are mutually perpendicular. The third lens comprises a fifth plane and a sixth concave cylindrical surface. The fourth lens comprises a seventh convex spherical surface and an eighth convex spherical surface, and the focal power of the fourth lens is positive. The fifth lens comprises a ninth concave spherical surface and a tenth concave spherical surface, and the focal power of the fifth lens is negative. The sixth lens includes an eleventh concave spherical surface and a twelfth convex spherical surface, and the optical power of the sixth lens is negative.

With reference to the first aspect, in certain implementations of the first aspect, a material of the first lens to the sixth lens is glass.

Illustratively, in embodiments of the present application, the glass cylindrical mirrors do not limit the coincidence of the two side symmetry axes of the same cylindrical mirror.

With reference to the first aspect, in certain implementation manners of the first aspect, the second lens group is sequentially disposed along a projection optical path: seventh lens, eighth lens, ninth lens, tenth lens, eleventh lens, twelfth lens, thirteenth lens. The seventh lens includes a thirteenth convex spherical surface and a fourteenth concave spherical surface, and the optical power of the seventh lens is positive. The eighth lens includes a fifteenth concave spherical surface and a sixteenth convex spherical surface, and the optical power of the eighth lens is positive. The ninth lens comprises a seventeenth concave cylindrical surface and an eighteenth concave cylindrical surface, and symmetry axes of the seventeenth concave cylindrical surface and the eighteenth concave cylindrical surface are perpendicular to each other. The tenth lens includes a nineteenth concave spherical surface and a twenty-second concave spherical surface, and the optical power of the tenth lens is negative. The eleventh lens includes a twenty-first convex spherical surface and a twenty-second convex spherical surface, and has positive optical power. The twelfth lens comprises a twenty-third convex cylindrical surface and a twenty-fourth concave cylindrical surface, and symmetry axes of the twenty-third convex cylindrical surface and the twenty-fourth concave cylindrical surface are perpendicular to each other. The thirteenth lens includes a twenty-fifth convex aspheric surface and a twenty-sixth convex aspheric surface, and the optical power of the thirteenth lens is positive.

With reference to the first aspect, in certain implementations of the first aspect, a material of the seventh lens to the thirteenth lens is glass.

Based on the scheme, the projection lens provided by the application realizes the effect of different length and width amplification ratios of images through thirteen lenses with different surface types. When the projection lens provided by the embodiment of the application is used for the HUD system, not only can the image with the image length-width ratio being matched with the HUD frame be generated, but also the shielding of an image source or the image in the HUD system is avoided, the complexity of the structure of the HUD system is reduced, and meanwhile, stray light generated by shielding in the HUD system is avoided. The HUD display brightness is enhanced, and meanwhile, the optical transmission efficiency and resolution of the HUD system are improved.

In a second aspect, embodiments of the present application provide a projection apparatus. The projection device includes: a display unit and a projection lens. The display unit is used for emitting first image light to the projection lens, and the first image light corresponds to a first image. The projection lens comprises a projection lens as described in the first aspect and any one of the possible implementations of the first aspect.

With reference to the second aspect, in certain implementations of the second aspect, the display unit includes: a light source and a modulation unit. The light source is used for generating a light beam carrying image data of an input image. The modulating unit is used for modulating the light beam according to the image data and generating the first image light. The ratio of the magnification ratio of the projection lens to the long side and the short side of the first image is A, the compression ratio of the modulation unit to the long side and the short side of the input image is B, and the A and the B satisfy the following conditions: a is less than or equal to 1.

The ratio of the magnification of the projection lens to the long side and the short side of the first image is a, and the ratio can be calculated by respectively calculating the magnification A1 of the projection lens to the long side of the first image and the magnification A2 of the projection lens to the short side of the first image, namely a=a1/A2.

The compression ratio of the modulation unit to the long side and the short side of the input image is B, which can be calculated by calculating the compression ratio B1 of the modulation unit to the long side and the compression ratio B2 of the modulation unit to the short side of the input image, namely b=b1/B2, respectively.

Illustratively, in the technical solution provided above, the modulation unit may be a reflective spatial light modulator and has a function of changing a polarization direction of incident linearly polarized light, for example, a liquid crystal on silicon (liquid crystal on silicon, LCoS) modulator.

In other examples, the modulation unit may also be a reflective spatial light modulator and have no function of changing the polarization direction of the incident linearly polarized light, such as micro-electro-mechanical system (MEMS) or digital micromirror device (digital micromirror device, DMD).

In still other examples, the modulation unit may also be a transmissive spatial light modulator, such as a liquid crystal display (Liquid Crystal Display, LCD) or the like. Compared with a transmission type spatial light modulator, the reflection type spatial light modulator has higher light utilization efficiency and is beneficial to energy conservation.

In a third aspect, an embodiment of the present application provides a display apparatus. The display device comprises a projection device and an imaging module as described in the second aspect and any one of the possible implementations of the second aspect. The imaging module generates a target image that satisfies a target aspect ratio based on the third image light. The imaging module includes a curved mirror, a reflecting mirror, or a combination thereof.

With reference to the third aspect, in certain implementations of the third aspect, the a and the B satisfy: a=b=1, the target aspect ratio is Y, the aspect ratio of the input image is X, and Y satisfies: y=x×a×b.

With reference to the third aspect, in certain implementations of the third aspect, the aspect ratio X of the input image is 13:5, the target aspect ratio Y is 13:5, the aspect ratio of the first image is 16:9, and the aspect ratio of the third image is 13:5.

With reference to the third aspect, in some implementations of the third aspect, the modulation unit is a liquid crystal on silicon LCoS chip, a size of the LCoS chip is 8.16mm×4.59mm, and an F-number of the projection lens is F _no 2.

With reference to the third aspect, in certain implementations of the third aspect, the a and the B satisfy: a < B <1, the target aspect ratio is Y, the aspect ratio of the input image is X, the ratio of the magnification of the imaging module to the long side and the short side of the third image is C, and Y satisfies: y=x a B C.

With reference to the third aspect, in certain implementations of the third aspect, the aspect ratio of the input image is 13:5, the target aspect ratio is 13:5, the aspect ratio of the first image is 16:9, and the aspect ratio of the third image is 13:6.

In a fourth aspect, an embodiment of the present application provides a vehicle. The vehicle comprises a display device as described in the third aspect and any possible implementation of the third aspect.

With reference to the fourth aspect, in certain implementations of the fourth aspect, the display device is mounted in an instrument panel of the vehicle.

With reference to the fourth aspect, in some implementations of the fourth aspect, the vehicle further includes a windshield, the image light emitted by the display device is incident on the windshield, and the windshield reflects the image light to a human eye.

The advantages of the second to fourth aspects may be specifically referred to the description of the advantages of the first aspect, and are not repeated here.

Drawings

Fig. 1 shows a schematic diagram of an application scenario of a projection lens according to an embodiment of the present application.

Fig. 2 is a schematic block diagram of a projection lens 200 according to an embodiment of the present application.

Fig. 3 is a schematic diagram illustrating a structure of the first lens group 210 in the longitudinal direction in the embodiment of the present application.

Fig. 4 shows a schematic structural diagram of the first lens group 210 in the short side direction in the embodiment of the present application.

Fig. 5 shows a schematic structural diagram of the second lens group 230 in the longitudinal direction in the embodiment of the present application.

Fig. 6 shows a schematic structural diagram of the second lens group 230 in the short side direction in the embodiment of the present application.

Fig. 7 shows a schematic structural diagram of a cylindrical lens 700 according to an embodiment of the present application.

Fig. 8 shows a schematic structural diagram of a cylindrical lens 800 according to an embodiment of the present application.

Fig. 9 shows a schematic structural diagram of a projection lens 900 according to an embodiment of the present application.

Fig. 10 is a schematic structural diagram of a projection lens 1000 according to an embodiment of the present application.

Fig. 11 shows a chromaticity diagram of a projection lens 1000 according to an embodiment of the application.

Fig. 12 shows a curvature of field evaluation chart of the projection lens 1000 according to the embodiment of the present application.

Fig. 13 shows a distortion evaluation chart of a projection lens 1000 according to an embodiment of the present application.

Fig. 14 shows a defocus curve of a projection lens 1000 according to an embodiment of the present application.

Fig. 15 shows a schematic structural diagram of a projection apparatus 1500 according to an embodiment of the present application.

Fig. 16 shows a schematic structural diagram of a display unit 1510 according to an embodiment of the present application.

Fig. 17 shows a flowchart of providing projection by the projection apparatus 1500 according to the embodiment of the present application.

Fig. 18 shows a schematic structural diagram of a display device 1800 according to an embodiment of the present application.

Fig. 19 shows a schematic structural diagram of a display device 1900 according to an embodiment of the application.

Fig. 20 shows a schematic structural diagram of a HUD system 2000 according to an embodiment of the present application.

Fig. 21 shows a schematic circuit diagram of a display device according to an embodiment of the present application.

Fig. 22 shows a functional framework schematic of a vehicle according to an embodiment of the present application.

Detailed Description

The technical scheme of the application will be described below with reference to the accompanying drawings.

The following description is made in order to facilitate understanding of embodiments of the present application.

The words "first", "second", etc. and various numerical numbers in the first, the text description of the embodiments of the application shown below or in the drawings are merely for descriptive convenience and are not necessarily for describing particular sequences or successes and are not intended to limit the scope of the embodiments of the application. For example, distinguishing between images passing through different optical lenses or distinguishing between different lenses or distinguishing between lens surfaces of different lenses, etc.

The terms "comprises," "comprising," and "having," in the context of the second, following illustrated embodiment of the present application, 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 that are expressly listed or inherent to such process, method, article, or apparatus.

Third, in embodiments of the application, the words "exemplary" or "such as" are used to mean examples, illustrations, or descriptions, and embodiments or designs described as "exemplary" or "such as" should not be construed as being preferred or advantageous over other embodiments or designs. The use of the word "exemplary" or "such as" is intended to present the relevant concepts in a concrete fashion to facilitate understanding.

Fourth, in the embodiment of the present application, image light refers to light carrying an image (or image information) for generating an image.

Fifth, in the drawings of the present application, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. Specifically, the spherical or aspherical shape shown in the drawings is shown by way of example, that is, the spherical or aspherical shape is not limited to the spherical or aspherical shape shown in the drawings. Also, the drawings are merely examples and are not drawn to scale.

Fig. 1 shows a schematic diagram of an application scenario of a HUD device according to an embodiment of the present application. As shown in fig. 1, the HUD device is provided on an automobile. The HUD device is used to project status information of a vehicle, instruction information of external objects, navigation information, and the like, through a windshield of the vehicle in a visual field of a driver. Status information includes, but is not limited to, travel speed, mileage, fuel amount, water temperature, and lamp status, etc. The indication information of the external object includes, but is not limited to, safe car distance, surrounding obstacle, reversing image and the like. The navigation information includes, but is not limited to, directional arrow, distance, travel time, and the like.

The virtual images corresponding to the navigation information and the indication information of the external object can be superimposed on the real environment outside the vehicle, so that the driver can obtain the visual effect of augmented reality, and the virtual images can be used for augmented reality (augmented reality, AR) navigation, adaptive cruising, lane departure early warning and the like. Since the virtual image corresponding to the navigation information can be combined with the real scene, the HUD device is generally matched with an advanced driving assistance system (advanced driving assistant system, ADAS) system of the automobile. In order not to disturb road conditions, the virtual image corresponding to the instrument information is usually about 2 meters to 3 meters from the human eye. In order to better integrate the virtual image corresponding to the navigation information with the real road surface, the distance between the virtual image corresponding to the navigation information and the human eye is generally about 7 meters to 15 meters. The position of the virtual image of the navigation information is called a far focal plane, and the plane of the virtual image of the instrument information is called a near focal plane.

Currently, DLP and LCOS spatial light modulators with high reliability are the first choice of HUD systems in order to achieve a HUD system with a large scale of high brightness. However, conventional HUD image generating lenses based on DLP or LCOS are generally of rotationally symmetrical structure, and the function of such lenses is to project an image on the DMD or LCOS onto a diffusion screen in an equally enlarged form, thereby realizing a function of relaying the image. Since the magnification of the rotationally symmetrical lens is uniform on the horizontal and vertical sides (long and short sides of the image source), the aspect ratio of the image projected onto the diffusion screen is the same as that of the DMD or LCOS, and is generally 16:9 or 2:1. However, from a demand and volume perspective, the aspect ratio of the final frame of the HUD is greater than the values described above, typically 10:4, 12:4 or 13:5. In order to adapt to the final aspect ratio of the HUD, part of the illumination light is often blocked in the image generating unit (picture generation unit, PGU), or the intermediate image is blocked at the diffusion screen, resulting in loss of brightness of the final HUD image, and problems of energy waste, resolution reduction, etc.

Based on the problems, the projection lens provided by the application can realize the emission of image light with the picture size required by matching HUD, and can avoid shielding of the illumination light or the relay image of PGU, and has the advantages of simple structure and high light energy utilization rate.

Fig. 2 is a schematic block diagram of a projection lens 200 according to an embodiment of the present application. As shown in fig. 2, the projection lens 200 includes a first lens group 210, a diaphragm 220, and a second lens group 230. The first lens group 210 is configured to refract the first image light and emit the second image light to the diaphragm 220. The diaphragm 220 is used for transmitting the second image light to the second lens group 230. The second lens group 230 is used for refracting the second image light and emitting the third image light.

Wherein the first image light carries a first image, the second image light carries a second image, and the third image light carries a third image. The third image is an image obtained by amplifying the long side and the short side of the first image with different magnifications.

In the embodiment of the present application, the projection lens 200 images the input first image light, and outputs the third image light carrying the third image, and because the third image is an image obtained by amplifying the long side and the short side of the first image with different magnifications, the projection lens 200 provided in the embodiment of the present application can achieve the effect of different magnifications of the length and the width of the image.

Referring to fig. 2, fig. 3 shows a schematic structural diagram of the long side direction of the first lens group 210 in the embodiment of the present application, where the long side direction refers to the long side direction of the first image, or may refer to the long side direction of the second image, or may refer to the long side direction of the third image. Specifically, as shown in fig. 3, the x-axis is the long-side direction of the first image or the second image or the third image, the y-axis is the optical axis direction of the lens group, and the z-axis is the short-side direction of the first image or the second image or the third image. The first lens group 210 includes, in order along the projection optical path, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, and a sixth lens 16.

Specifically, the first lens 11 includes a first convex spherical surface 111 and a second concave spherical surface 112, and the first lens 11 has negative optical power. The second lens 12 includes a third convex cylindrical surface 121 and a fourth concave cylindrical surface 122, and symmetry axes of the third convex cylindrical surface 121 and the fourth concave cylindrical surface 122 are perpendicular to each other. The third lens 13 includes a fifth plane 131 and a sixth concave cylindrical surface 132. The fourth lens 14 includes a seventh convex spherical surface 141 and an eighth convex spherical surface 142, and the optical power of the fourth lens 14 is positive. The fifth lens 15 includes a ninth concave spherical surface 151 and a tenth concave spherical surface 152, and the fifth lens 15 has negative optical power. The sixth lens 16 includes an eleventh concave spherical surface 161 and a twelfth convex spherical surface 162, and the optical power of the sixth lens 16 is negative.

Table 1 shows the relevant optical data of the first lens group 210 provided by the embodiment of the present application.

TABLE 1

Surface numbering	Surface type	Thickness of (L)	Material	Refractive mode	Y-half pore diameter
						Object plane	Spherical surface	120.0000
111	Spherical surface	1.0000	Glass	Refraction by refraction	13.6553
						112	Spherical surface	5.4355	Glass	Refraction by refraction	12.6860
121	Cylindrical surface	2.2304	Glass	Refraction by refraction	12.5765
						122	Cylindrical surface	2.0000	Glass	Refraction by refraction	12.4382
131	Cylindrical surface	2.0000	Glass	Refraction by refraction	12.4724
						132	Cylindrical surface	0.1000	Glass	Refraction by refraction	12.4848
141	Spherical surface	4.4552	Glass	Refraction by refraction	12.0024
						142	Spherical surface	2.2677	Glass	Refraction by refraction	11.6538
151	Spherical surface	4.0000	Glass	Refraction by refraction	9.5376
						152	Spherical surface	4.8139	Glass	Refraction by refraction	6.8144
161	Spherical surface	4.0000	Glass	Refraction by refraction	6.8078
						162	Spherical surface	14.7011	Glass	Refraction by refraction	7.6546

Fig. 4 shows a schematic structural diagram of the short side direction of the first lens group 210 in the embodiment of the present application, where the short side direction refers to the short side direction of the first image, or may refer to the short side direction of the second image, or may refer to the short side direction of the third image. Specifically, as shown in fig. 4, the x-axis is the long-side direction of the first image or the second image or the third image, the y-axis is the optical axis direction of the lens group, and the z-axis is the short-side direction of the first image or the second image or the third image.

The parameters of each lens in fig. 4 may refer to the corresponding descriptions in fig. 3, and will not be described herein.

Table 2 shows the relevant optical data of the diaphragm 220 provided by an embodiment of the present application.

TABLE 2

Surface numbering	Surface type	Thickness of (L)	Material	Refractive mode	Y-half pore diameter
						Diaphragm 220	Spherical surface	0.7287		Refraction by refraction	6.3445

Referring to fig. 2, fig. 5 is a schematic diagram illustrating a structure of the second lens group 230 in the longitudinal direction in the embodiment of the application. The second lens group 230 includes a seventh lens 31, an eighth lens 32, a ninth lens 33, a tenth lens 34, an eleventh lens 35, a twelfth lens 36, and a thirteenth lens 37 in this order along the projection optical path.

Specifically, the seventh lens 31 includes a thirteenth convex spherical surface 311 and a fourteenth concave spherical surface 312, and the seventh lens 31 has positive optical power. The eighth lens 32 includes a fifteenth concave spherical surface 321 and a sixteenth convex spherical surface 322, and the optical power of the eighth lens 32 is positive. The ninth lens 33 includes a seventeenth concave cylindrical surface 331 and an eighteenth concave cylindrical surface 332, and symmetry axes of the seventeenth concave cylindrical surface 331 and the eighteenth concave cylindrical surface 332 are perpendicular to each other. The tenth lens 34 includes a nineteenth concave spherical surface 341 and a twenty-second concave spherical surface 342, and the optical power of the tenth lens 34 is negative. The eleventh lens 35 includes a twenty-first convex spherical surface 351 and a twenty-second convex spherical surface 352, and the eleventh lens 35 has positive optical power. The twelfth lens 36 includes a twenty-third convex cylindrical surface 361 and a twenty-fourth concave cylindrical surface 362, and symmetry axes of the twenty-third convex cylindrical surface 361 and the twenty-fourth concave cylindrical surface 362 are perpendicular to each other. The thirteenth lens 37 includes a twenty-fifth convex aspheric surface 371 and a twenty-sixth convex aspheric surface 372, the thirteenth lens 37 having positive optical power.

Table 3 shows the relevant optical data of the first lens group 210 provided by the embodiment of the present application.

TABLE 3 Table 3

Fig. 6 shows a schematic structural diagram of the second lens group 230 in the short side direction in the embodiment of the present application. The parameters of each lens in fig. 6 may refer to the corresponding descriptions in fig. 5, and will not be described herein.

Fig. 7 shows a schematic structural diagram of a cylindrical lens 700 according to an embodiment of the present application. In fig. 7, the symmetry axes of both sides of the cylindrical lens 700 are perpendicular to each other. When the cylindrical lens is the second lens 12 in fig. 3, the third cylindrical surface is convex and symmetrical along the y-axis, and the fourth cylindrical surface is concave and symmetrical along the x-axis. Wherein the x-axis and the y-axis are two mutually perpendicular directions perpendicular to the optical axis of the lens. When the cylindrical lens is the twelfth lens 36 in fig. 5, the twenty-third cylindrical surface is convex and symmetrical along the y-axis, and the twenty-fourth cylindrical surface is concave and symmetrical along the x-axis, wherein the x-axis and the y-axis are two mutually perpendicular directions perpendicular to the optical axis of the lens.

Fig. 8 shows a schematic structural diagram of a cylindrical lens 800 according to an embodiment of the present application. In fig. 8, the symmetry axes of both sides of the cylindrical lens 800 are perpendicular to each other. When the cylindrical lens is the ninth lens 33 in fig. 5 described above, the seventeenth cylindrical lens is concave and symmetrical along the x-axis, and the eighteenth cylindrical lens is concave and symmetrical along the y-axis, wherein the x-axis and the y-axis are two mutually perpendicular directions perpendicular to the optical axis of the lens.

Fig. 9 shows a schematic structural diagram of a projection lens 900 according to an embodiment of the present application. In fig. 9, the direction is a longitudinal direction of the projection lens 900, and the projection lens 900 includes the first lens group 210, the diaphragm 220, and the second lens group 230. The parameters of each lens in the first lens group 210 in fig. 9 may refer to the corresponding descriptions in fig. 3, and the parameters of each lens in the second lens group 230 in fig. 9 may refer to the corresponding descriptions in fig. 5, which are not repeated here.

Fig. 10 is a schematic structural diagram of a projection lens 1000 according to an embodiment of the present application. In fig. 10, the direction is a short side direction of the projection lens 1000, and the projection lens 1000 includes the first lens group 210, the diaphragm 220, and the second lens group 230. The parameters of each lens in the first lens group 210 in fig. 10 may refer to the corresponding descriptions in fig. 4, and the parameters of each lens in the second lens group 230 in fig. 10 may refer to the corresponding descriptions in fig. 6, which are not repeated here.

Fig. 11 shows a chromaticity diagram of a projection lens 1000 according to an embodiment of the present application, which is also referred to as an on-axis chromatic aberration curve or an on-axis chromatic aberration curve. The optical system is used for converging the light with different wavelengths, and the focus is deviated after the light passes through the optical system, so that the image focus planes of the light with different wavelengths imaged finally cannot be overlapped, and the composite light is scattered to form chromatic dispersion. In fig. 11, the abscissa indicates the magnitude of the value in mm and the ordinate indicates the field of view percentage.

Fig. 12 shows a curvature of field evaluation chart of the projection lens 1000 according to the embodiment of the present application. Which represent meridional image plane curvature and sagittal image plane curvature. In the figure, the abscissa represents the magnitude of the field curvature, and the ordinate represents the field height of the lens.

Fig. 13 shows a distortion evaluation chart of a projection lens 1000 according to an embodiment of the present application. Which represents the distortion magnitude values at different viewing angles. In the figure, the abscissa represents the amount of distortion, and the ordinate represents the angle of the field of view of the lens. The distortion amount of the projection lens is controlled within 1%, and the distortion control is very excellent.

Fig. 14 shows a defocus curve of a projection lens 1000 according to an embodiment of the present application, where the abscissa represents a position in mm and the ordinate represents a value of a modulation transfer function (modulation transfer function, MTF) that is commonly used as a measure of the lens to illustrate how modulation of an object is transferred to an image by the lens, i.e. to measure the ability of the projection lens to transfer contrast from an object to an image at a specific resolution. Different curves represent different fields of view, and the full-field MTF of the projection lens 1000 provided by the embodiment of the application is more than 0.5, and the highest point of the defocusing curve is concentrated, so that the performance is excellent.

Fig. 15 shows a schematic structural diagram of a projection apparatus 1500 according to an embodiment of the present application. As shown in fig. 15, the projection apparatus 1500 includes: a display unit 1510 and a projection lens 1520. The display unit 1510 is configured to emit first image light to the projection lens 1520, where the first image light corresponds to the first image.

The display unit 1510 may include a light source 1511 and a modulation unit 1512 as shown in fig. 16. Wherein the light source 1511 is for generating a light beam carrying image data of an input image. The modulation unit 1512 is configured to modulate a light beam according to image data and generate first image light.

The modulation unit may be, for example, a reflective spatial light modulator and has a function of changing the polarization direction of incident linearly polarized light, for example, an LCoS modulator.

In other examples, the modulation unit may also be a reflective spatial light modulator and have no function of changing the polarization direction of the incident linearly polarized light, such as MEMS or DMD.

In still other examples, the modulation unit may also be a transmissive spatial light modulator, such as an LCD or the like. Compared with a transmission type spatial light modulator, the reflection type spatial light modulator has higher light utilization efficiency and is beneficial to energy conservation.

The projection lens 1520 may refer to the description in the above specification, and will not be described here.

In one implementation manner, if the target aspect ratio of the image carried by the image light emitted from the projection apparatus 1500 is required to be 13:5, the projection process of the projection lens is shown in fig. 17, and specifically, the method may include the following steps.

S1710, the video source inputs input image information with an aspect ratio of 13:5.

Specifically, the video source inputs image data of an input image having an aspect ratio of 13:5 to an input of the projection device. Wherein the video source serves as an input device or apparatus for image data information of the projection apparatus 1500.

S1720, stretching the input image according to the aspect ratio of the image that can be processed by the modulating means.

Specifically, the processing unit stretches an image input from the video source according to the aspect ratio of the image which can be processed by the modulation unit, so that the aspect ratio of the input image is matched with the modulation unit. For example, when the aspect ratio of the image that the modulation unit can process is 16:9, the processing unit stretches the input image with the aspect ratio of 13:5 into the input image with the aspect ratio of 16:9.

The processing unit may be part of the modulation unit or a module or device separate from the modulation unit, and the application is not limited.

S1730, the modulation unit processes the input image and outputs a first image light carrying the first image.

For example, for a three-plate LCoS modulation unit, first, white light emitted from a light source is split into light rays of three primary colors of red, green and blue by a light splitting system (polarizer, etc.). Then, each primary color light irradiates a reflective LCoS chip, the modulation unit changes the intensity of the light reflected by each pixel point of the LCoS chip by controlling the state of liquid crystal molecules on the LCoS panel according to the input image information, and finally the light reflected by the LCoS is converged into first image light through necessary optical refraction and emitted.

S1740, the projection lens generates output image light based on the first image light, which carries an output image satisfying the target aspect ratio.

Specifically, the projection lens receives the first image light output from the modulation unit, and generates output image light based on the first image light, the output image light carrying an output image satisfying a target aspect ratio. For example, if the target aspect ratio is 13:5, the aspect ratio of the first image emitted by the modulation unit is 16:9, and a projection lens with a ratio of the length and the width of the projection lens to the magnification of 1.45 can be adopted, so that the aspect ratio of the generated output image can be satisfied with 13:5.

Fig. 18 shows a schematic structural diagram of a display device 1800 according to an embodiment of the present application. As shown in fig. 18, the display device 1800 includes: projection device 1810 and imaging module 1820. The projection device 1810 may refer to the related description of the projection device 1500 in fig. 15, which is not repeated herein. The imaging module 1820 generates a target image that satisfies a target aspect ratio based on the image light exiting the projection device 1810.

If the modulation unit in the projection device 1810 is LCoS, the display device 1800 may be as shown in fig. 19. In fig. 19, the light source 1910 includes a first light source 19101, a second light source 19102, a third light source 19103, and a polarizing element 19104, which may correspond to monochromatic light of three primary colors including red light, blue light, and green light, respectively. The polarizing element may be a polarizer or the like. The modulation unit 1920 is an LCoS modulator. The structure of the projection lens 1930 can be described with reference to fig. 9 or 10, and will not be described herein. Imaging module 1940 includes a first freeform mirror 19401 and a second freeform mirror 19402.

Specifically, the light source 1910 inputs a light beam for carrying image data to the modulation unit, and after the modulation unit 1920 receives the light beam from the light source 1910, modulates the input light beam based on data information of the input image, and outputs first image light carrying the first image. The first image light passes through a projection lens 1930 to generate an output image, which is carried in the output image light, which is transmitted to an imaging module 1940 where it passes through 19401 and 19402 to ultimately exit the imaging light.

The first image is an image obtained by compressing the difference aspect ratio of the input image. If the aspect ratio of the input image is 13:5, the aspect ratio of the frame processable by the modulation unit 1920 is 16:9, and the aspect ratio of the first image is 16:9.

If the system requires a target aspect ratio of 13:5 for the final imaging light generated image, the ratio of length to width magnification for the first image is 1.45. In one implementation, the length and width magnification of the projection lens 1930 on the first image is 1.45, at this time, the length magnification of the projection lens 1930 on the first image is 13.3, the short-side magnification is 9.15, and the length magnification is 1.45 times that of the short-side magnification. That is, the aspect ratio of the output image emitted from the projection lens 1930 can satisfy the aspect ratio of the target image. In general, that is, the ratio of the magnification of the projection lens 1930 to the long side and the short side of the first image is a, the compression ratio of the modulation unit 1920 to the long side and the short side of the input image is B, and the ratio of a to B satisfies: a=b=1, i.e. the magnification of the long side and the short side of the first image by the projection lens 1930 is inversely proportional to the compression ratio of the long side and the short side of the input image by the modulation unit 1920. If the aspect ratio of the input image is X and the target aspect ratio is Y, Y satisfies: y=x×a×b.

In this case, the free-form surface mirror 19401 in the imaging module 1940 is inversely proportional to the ratio of the free-form surface mirror 19402 to the length-width magnification of the projection lens output image. In particular, the first freeform mirror and the second freeform mirror in the imaging module 1940 may each be planar mirrors.

Specifically, at this time, the size of the LCoS chip corresponding to the projection lens 1930 is 8.16mm×4.59mm, the f-number is 2.0, the imaging satisfies the full-frame MTF >0.5, and the distortion is <1%.

In another implementation, the length-width magnification of the projection lens 1930 on the first image is less than 1.45, that is, the aspect ratio of the image carried in the image light emitted by the projection lens 1930 cannot meet the aspect ratio of the target image. At this time, the imaging module 1940 will split a portion of the magnification, that is, the imaging module 1940 and the free-form surface mirror in the projection lens together achieve a length-width magnification of 1.45 for the first image. In general, that is, the ratio of the magnification of the projection lens 1930 to the long side and the short side of the first image is a, the compression ratio of the modulation unit 1920 to the long side and the short side of the input image is B, and the ratio of a to B satisfies: a is less than 1. If the ratio of the magnification of the imaging module 1940 to the long side and the short side of the image light output by the projection lens is C, a×c=1.45. At this time, if the aspect ratio of the input image is X and the target aspect ratio is Y, then Y satisfies: y=x a B C.

Optionally, the display device 1900 also includes a diffuser 1950, the diffuser 1950 being used for relay imaging. If the aspect ratio of the input image of the display device is the same as the target aspect ratio, in one possible implementation, if the magnification of the long side and the short side of the first image by the projection lens 1930 is inversely proportional to the compression ratio of the long side and the short side of the input image by the modulation unit 1920, the image on the diffusion screen 1950 satisfies the target aspect ratio. In another implementation, if the magnification of the projection lens 1930 on the long side and the short side of the first image is not inversely proportional to the compression ratio of the modulation unit 1920 on the long side and the short side of the input image, the imaging module 1940 is configured to amplify the aspect ratio of the image on the diffusion screen 1950 with different magnifications, and output imaging light carrying an image satisfying the target aspect ratio.

Fig. 20 shows a schematic diagram of a display device 1900 according to an embodiment of the application applied to a HUD. In fig. 20, a display device 2010 and a windshield 2020 are included. Among other things, the display device 2010 includes an enclosure housing 2011 and a dust cap 2012.

Specifically, the imaging light emitted from the display device 1900 is transmitted through the dust cover 2012 and then is incident on the windshield 2020, and the imaging light is reflected by the windshield and then is incident on the human eye, and is imaged on the retina, so that the human eye can view the image carried by the imaging light.

In one possible implementation, if the imaging light is polarized, the windshield may also be coated with a polarizing film to eliminate stray light.

Fig. 21 shows a schematic circuit diagram of a display device according to an embodiment of the present application. As shown in fig. 21, the circuits in the display device mainly include a main processor (host CPU) 3101, an external memory interface 3102, an internal memory 3103, an audio module 3104, a video module 3105, a power module 3106, a wireless communication module 3107, an i/O interface 3108, a video interface 3109, a display circuit 3110, a modulator 3111, and the like. The main processor 3101 and its peripheral components such as an external memory interface 3102, an internal memory 3103, an audio module 3104, a video module 3105, a power module 3106, a wireless communication module 3107, an i/O interface 3108, a video interface 3109, and a display circuit 3110 may be connected via a bus. The main processor 3101 may be referred to as a front-end processor.

In addition, the circuit diagram illustrated in the embodiment of the present application does not constitute a specific limitation of the display device. In other embodiments of the application, the display device may include more or less components than shown, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

The main processor 3101 includes one or more processing units, for example: the main processor 3101 may include an application processor (Application Processor, AP), a modem processor, a graphics processor (Graphics Processing Unit, GPU), an image signal processor (Image Signal Processor, ISP), a controller, a video codec, a digital signal processor (Digital Signal Processor, DSP), a baseband processor, and/or a Neural network processor (Neural-Network Processing Unit, NPU), etc. Wherein the different processing units may be separate devices or may be integrated in one or more processors.

A memory may also be provided in the main processor 3101 for storing instructions and data. In some embodiments, the memory in the main processor 3101 is a cache memory. The memory may hold instructions or data that the main processor 3101 has just used or recycled. If the main processor 3101 needs to reuse the instruction or data, it may be called directly from the memory. Repeated accesses are avoided, reducing the latency of the main processor 3101, and thus improving the efficiency of the system.

In some embodiments, the display device may also include a plurality of Input/Output (I/O) interfaces 3108 connected to the main processor 3101. The interface 3108 may include an integrated circuit (Inter-Integrated Circuit, I2C) interface, an integrated circuit built-in audio (Inter-Integrated Circuit Sound, I2S) interface, a pulse code modulation (Pulse Code Modulation, PCM) interface, a universal asynchronous receiver Transmitter (Universal Asynchronous Receiver/Transmitter, UART) interface, a mobile industry processor interface (Mobile Industry Processor Interface, MIPI), a General-Purpose Input/Output (GPIO) interface, a subscriber identity module (Subscriber Identity Module, SIM) interface, and/or a universal serial bus (Universal Serial Bus, USB) interface, a controller area network (Controller Area Network, CAN) interface, and the like. The I/O interface 3108 may be connected to a device such as a mouse, a touch pad, a keyboard, a camera, a speaker/horn, or a microphone, or may be connected to a physical key (e.g., a volume key, a brightness adjustment key, or an on/off key) on the display device.

The external memory interface 3102 may be used to connect an external memory card, such as a Micro SD card, to realize expansion of the memory capability of the display device. The external memory card communicates with the main processor 3101 through an external memory interface 3102, implementing a data storage function.

The internal memory 3103 may be used to store computer executable program code comprising instructions. The internal memory 3103 may include a storage program area and a storage data area. The storage program area may store an operating system, an application program (such as a call function, a time setting function, etc.) required for at least one function, and the like. The storage data area may store data created during use of the display device (e.g., phone book, universal time, etc.), etc. In addition, the internal memory 3103 may include a high-speed random access memory, and may also include a nonvolatile memory such as at least one magnetic disk storage device, a flash memory device, a universal flash memory (Universal Flash Storage, UFS), or the like. The main processor 3101 executes various functional applications of the display device and data processing by executing instructions stored in the internal memory 3103, and/or instructions stored in a memory provided in the main processor 3101.

The display device can implement audio functions through an audio module 3104, an application processor, and the like. Such as music playing, talking, etc.

The audio module 3104 is used to convert digital audio information into an analog audio signal output, and also to convert an analog audio input into a digital audio signal. The audio module 3104 may also be used to encode and decode audio signals, such as for playback or recording. In some embodiments, the audio module 3104 may be provided in the main processor 3101, or some functional modules of the audio module 3104 may be provided in the main processor 3101.

The video interface 3109 may receive externally input audio and video signals, which may specifically be a high-definition multimedia interface (High Definition Multimedia Interface, HDMI), a digital video interface (Digital Visual Interface, DVI), a video graphics array (Video Graphics Array, VGA), a Display Port (DP), etc., and the video interface 3109 may also output video. When the display device is used as a head-up display, the video interface 3109 may receive a speed signal and an electric quantity signal input by a peripheral device, and may also receive an AR video signal input from the outside. When the display device is used as a projector, the video interface 3109 can receive a video signal input from an external computer or a terminal device.

The video module 3105 may decode video input by the video interface 3109, for example, h.264 decoding. The video module can also encode the video collected by the display device, for example, H.264 encoding is carried out on the video collected by the external camera. The main processor 3101 may decode the video input from the video interface 3109, and output the decoded image signal to the display circuit 3110.

The display circuit 3110 and the modulator 3111 are for displaying corresponding images. In this embodiment, the video interface 3109 receives an externally input video source signal, the video module 3105 decodes and/or digitizes the video source signal, and outputs one or more image signals to the display circuit 3110, and the display circuit 3110 drives the modulator 3111 to image the incident polarized light according to the input image signal, so as to output at least two imaging lights. Further, the main processor 3101 may output one or more image signals to the display circuit 3110.

In this embodiment, the display circuit 3110 and the modulator 3111 belong to electronic components in the modulation unit 1512 shown in fig. 16, and the display circuit 3110 may be referred to as a driving circuit.

The power module 3106 is configured to provide power to the main processor 3101 and the light source 3100 according to input power (e.g., direct current), and a rechargeable battery may be included in the power module 3106, and the rechargeable battery may provide power to the main processor 3101 and the light source 3100. Light from light source 3100 may be transmitted to modulator 3111 for imaging to form an image light signal.

The wireless communication module 3107 may enable the display device to communicate wirelessly with the outside world, which may provide solutions for wireless communication such as wireless local area network (Wireless Local Area Networks, WLAN) (e.g., wireless fidelity (Wireless Fidelity, wi-Fi) network), bluetooth (BT), global navigation satellite system (Global Navigation Satellite System, GNSS), frequency modulation (Frequency Modulation, FM), near field wireless communication technology (Near Field Communication, NFC), infrared technology (IR), etc. The wireless communication module 3107 may be one or more devices integrating at least one communication processing module. The wireless communication module 3107 receives electromagnetic waves via an antenna, modulates the electromagnetic wave signals, filters the electromagnetic wave signals, and transmits the processed signals to the main processor 3101. The wireless communication module 3107 may also receive a signal to be transmitted from the main processor 3101, frequency-modulate it, amplify it, and convert it into electromagnetic waves to radiate.

In addition, the video data decoded by the video module 3105 may be received wirelessly by the wireless communication module 3107 or read from an external memory, for example, the display device may receive video data from a terminal device or an in-vehicle entertainment system via a wireless lan in the vehicle, and the display device may read audio/video data stored in the external memory, in addition to the video data input via the video interface 3109.

The display device may be mounted on a vehicle, and referring to fig. 22, fig. 22 shows a schematic diagram of a possible functional frame of a vehicle according to an embodiment of the present application.

As shown in FIG. 22, various subsystems may be included in the functional framework of the vehicle, such as a sensor system 12, a control system 14, one or more peripheral devices 16 (one shown in the illustration), a power supply 18, a computer system 20, and a display system 22, as shown. Alternatively, the vehicle may include other functional systems, such as an engine system to power the vehicle, etc., as the application is not limited herein.

The sensor system 12 may include a plurality of sensing devices that sense the measured information and convert the sensed information to an electrical signal or other desired form of information output according to a certain rule. As shown, these detection devices may include, but are not limited to, a global positioning system (global positioning system, GPS), a vehicle speed sensor, an inertial measurement unit (inertial measurement unit, IMU), a radar unit, a laser rangefinder, an imaging device, a wheel speed sensor, a steering sensor, a gear sensor, or other elements for automatic detection, and so forth.

The control system 14 may include several elements such as a steering unit, a braking unit, a lighting system, an autopilot system, a map navigation system, a network timing system, and an obstacle avoidance system as shown. Optionally, control system 14 may also include elements such as throttle controls and engine controls for controlling the speed of travel of the vehicle, as the application is not limited.

Peripheral device 16 may include several elements such as the communication system in the illustration, a touch screen, a user interface, a microphone, and a speaker, among others. Wherein the communication system is used for realizing network communication between the vehicle and other devices except the vehicle. In practical applications, the communication system may employ wireless communication technology or wired communication technology to enable network communication between the vehicle and other devices. The wired communication technology may refer to communication between the vehicle and other devices through a network cable or an optical fiber, etc.

The power source 18 represents a system that provides power or energy to the vehicle, which may include, but is not limited to, a rechargeable lithium battery or lead acid battery, or the like. In practical applications, one or more battery packs in the power supply are used to provide electrical energy or power for vehicle start-up, the type and materials of the power supply are not limiting of the application.

Several functions of the vehicle are performed by the control of the computer system 20. The computer system 20 may include one or more processors 2001 (shown as one processor) and memory 2002 (which may also be referred to as storage devices). In practical applications, the memory 2002 is also internal to the computer system 20, or external to the computer system 20, for example, as a cache in a vehicle, and the application is not limited thereto. Wherein,,

the processor 2001 may include one or more general-purpose processors, such as a graphics processor (graphic processing unit, GPU). The processor 2001 may be used to execute related programs or instructions corresponding to the programs stored in the memory 2002 to implement the corresponding functions of the vehicle.

Memory 2002 may include volatile memory (RAM), such as RAM; the memory may also include a non-volatile memory (non-volatile memory), such as ROM, flash memory (flash memory), HDD, or solid state disk SSD; memory 2002 may also include combinations of the above types of memory. Memory 2002 may be used to store a set of program codes or instructions corresponding to the program codes so that processor 2001 invokes the program codes or instructions stored in memory 2002 to implement the corresponding functions of the vehicle. In the present application, the memory 2002 may store a set of program codes for vehicle control, and the processor 2001 may call the program codes to control the safe running of the vehicle, and how the safe running of the vehicle is achieved will be described in detail below.

Alternatively, the memory 2002 may store information such as road maps, driving routes, sensor data, and the like, in addition to program codes or instructions. The computer system 20 may implement the relevant functions of the vehicle in combination with other elements in the functional framework schematic of the vehicle, such as sensors in the sensor system, GPS, etc. For example, the computer system 20 may control the direction of travel or speed of travel of the vehicle, etc., based on data input from the sensor system 12, and the application is not limited.

The display system 22 may display image information, such as navigation information, play video, and the like. The specific structure of the display system 22 refers to the embodiment of the display device described above, and will not be described herein.

Wherein FIG. 22 illustrates the present application as including four subsystems, sensor system 12, control system 14, computer system 20, and display system 22 are exemplary only, and not limiting. In practical applications, the vehicle may combine several elements in the vehicle according to different functions, thereby obtaining subsystems with corresponding different functions. In practice, the vehicle may include more or fewer systems or elements, and the application is not limited.

The above-mentioned vehicles may be cars, trucks, motorcycles, buses, boats, airplanes, helicopters, lawnmowers, recreational vehicles, construction equipment, electric cars, golf carts, trains, carts, etc., and embodiments of the present application are not particularly limited.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs.

The above embodiments are only examples of the present application, and are not intended to limit the present application, and any modifications, equivalent substitutions, improvements, etc. made on the basis of the present application should be included in the scope of the present application.

Claims

1. A projection lens, comprising: a first lens group, a diaphragm and a second lens group which are sequentially arranged along a projection light path,

the first lens group is used for refracting the first image light and emitting the second image light to the diaphragm;

the diaphragm is used for transmitting the second image light;

the second lens group is used for refracting the second image light and emitting third image light,

the first image light bears a first image, the second image light bears a second image, the third image light bears a third image, and the third image is obtained by amplifying the long side and the short side of the first image with different amplification factors.

2. The projection lens of claim 1 wherein the lens is configured to,

The focal lengths of the first lens group and the second lens group are positive.

3. The projection lens of claim 1 or 2, wherein the first lens group is disposed in sequence along a projection optical path: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens,

the first lens comprises a first convex spherical surface and a second concave spherical surface, and the focal power of the first lens is negative;

the second lens comprises a third convex cylindrical surface and a fourth concave cylindrical surface, and symmetry axes of the third convex cylindrical surface and the fourth concave cylindrical surface are mutually perpendicular;

the third lens comprises a fifth plane and a sixth concave cylindrical surface;

the fourth lens comprises a seventh convex spherical surface and an eighth convex spherical surface, and the focal power of the fourth lens is positive;

the fifth lens comprises a ninth concave spherical surface and a tenth concave spherical surface, and the focal power of the fifth lens is negative;

the sixth lens includes an eleventh concave spherical surface and a twelfth convex spherical surface, and the optical power of the sixth lens is negative.

4. A projection lens according to claim 3, wherein,

the materials of the first lens to the sixth lens are glass.

5. The projection lens of any one of claims 1 to 4 wherein the second lens group is disposed in sequence along a projection optical path: a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens,

the seventh lens comprises a thirteenth convex spherical surface and a fourteenth concave spherical surface, and the focal power of the seventh lens is positive;

the eighth lens comprises a fifteenth concave spherical surface and a sixteenth convex spherical surface, and the focal power of the eighth lens is positive;

the ninth lens comprises a seventeenth concave cylindrical surface and an eighteenth concave cylindrical surface, and symmetry axes of the seventeenth concave cylindrical surface and the eighteenth concave cylindrical surface are perpendicular to each other;

the tenth lens comprises a nineteenth concave spherical surface and a twenty-first concave spherical surface, and the focal power of the tenth lens is negative;

the eleventh lens comprises a twenty-first convex spherical surface and a twenty-second convex spherical surface, and the focal power of the eleventh lens is positive;

the twelfth lens comprises a twenty-third convex cylindrical surface and a twenty-fourth concave cylindrical surface, and symmetry axes of the twenty-third convex cylindrical surface and the twenty-fourth concave cylindrical surface are mutually perpendicular;

The thirteenth lens includes a twenty-fifth convex aspheric surface and a twenty-sixth convex aspheric surface, and the optical power of the thirteenth lens is positive.

6. The projection lens of claim 5 wherein the lens is configured to,

the seventh to thirteenth lenses are made of glass.

7. A projection apparatus, comprising: a display unit and a projection lens according to any one of claims 1 to 6,

the display unit is used for emitting first image light to the projection lens, and the first image light corresponds to a first image.

8. The projection device of claim 7, wherein the display unit includes: a light source and a modulation unit,

the light source is used for generating a light beam carrying image data of an input image;

the modulating unit is used for modulating the light beam according to the image data and generating the first image light;

the ratio of the magnification ratio of the projection lens to the long side and the short side of the first image is A, the compression ratio of the modulation unit to the long side and the short side of the input image is B, and the A and the B satisfy the following conditions: a is less than or equal to 1.

9. A display device comprising the projection device as claimed in claim 7 or 8 and an imaging module,

The imaging module generates a target image that satisfies a target aspect ratio based on the third image light.

10. The display device of claim 9, wherein the display device comprises a display device,

the A and the B satisfy the following conditions: a=b=1, the target aspect ratio is Y, the aspect ratio of the input image is X, and Y satisfies: y=x×a×b.

11. The display device of claim 10, wherein the display device comprises a display device,

the aspect ratio X of the input image is 13:5, the target aspect ratio Y is 13:5, the aspect ratio of the first image is 16:9, and the aspect ratio of the third image is 13:5.

12. The display device according to any one of claims 9 to 11, wherein,

the modulation unit is a LCoS chip with a size of 8.16mm by 4.59mm, and the aperture F of the projection lens _no 2.

13. The display device of claim 9, wherein the display device comprises a display device,

the A and the B satisfy the following conditions: a < B <1, the target aspect ratio is Y, the aspect ratio of the input image is X, the ratio of the magnification of the imaging module to the long side and the short side of the third image is C, and Y satisfies: y=x a B C.

14. The display device of claim 13, wherein the display device comprises a display device,

The aspect ratio of the input image is 13:5, the target aspect ratio is 13:5, the aspect ratio of the first image is 16:9, and the aspect ratio of the third image is 13:6.

15. A vehicle comprising a display device according to any one of claims 9 to 14.

16. The vehicle of claim 15, wherein the display device is mounted in an instrument panel of the vehicle.

17. The vehicle according to claim 15 or 16, further comprising a windshield, the image light emitted from the display device being incident on the windshield, the windshield reflecting the image light to a human eye.