Car lamp projection device

Abstract

The utility model discloses a car lamp projection device, which comprises a light source; the illuminating lens group is positioned on the light emitting side of the light source; the illuminating lens group at least comprises a first lens and a second lens which are sequentially arranged along the light path propagation direction; the first lens has positive focal power, the distance between the first lens and the light source is smaller than the focal length of the first lens, and the first lens is used for expanding light beams emitted by the light source; the second lens has positive focal power and is used for collimating the light beam emitted by the first lens; the liquid crystal display panel is used for modulating the light emitted by the illumination lens group to form a display picture; and the imaging lens group is used for imaging the display picture. The light beams emitted by the light source pass through the two lenses with the positive focal power in the illumination lens group, the light emitting angles of the light beams are sequentially reduced, the energy of light spots projected to the liquid crystal display panel is more concentrated, the brightness of a display picture is improved, and then the brightness of a projection picture formed after the display picture is imaged through the imaging lens group is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to projection technical field especially relates to a car lamp projection device. BACKGROUND

[0002] Car lamp projection is a projection technology applied to car headlamps or tail lamps, through setting projection device in car lamp, can project specific image, sign or information to surrounding environment, realizes diversified function according to user demand, has extensive application prospect. For example, can utilize car lamp projection device to project navigation information, car distance prompt, obstacle warning and other driving information to road surface when driving at night, facilitates driver to check, to assist driving and safety warning, or can utilize car lamp projection device to show pattern, character, mark, play video etc. to provide personalized entertainment function for user, can also be used to interact or communicate with other vehicles or pedestrians etc. However, traditional projection equipment is difficult to apply in car lamp projection due to its large size, and the existing car lamp projection equipment has the problem of low brightness, and the image quality of the projection picture is low. SUMMARY

[0003] The utility model provides a kind of car lamp projection device to improve the brightness of the projection picture of car lamp projection device.

[0004] The utility model provides a kind of car lamp projection device, comprising:

[0005] Illumination component, the illumination component includes light source and illumination mirror group;The illumination mirror group is located at the light exit side of the light source;The illumination mirror group at least includes the first lens and the second lens sequentially arranged along the propagation direction of light path, the first lens and the second lens all have positive focal power, and the interval between the first lens and the light source is less than the focal length of the first lens;

[0006] Display panel, located at the light exit side of the illumination mirror group, for modulating the light ray emitted by the illumination mirror group, forms display picture;

[0007] Imaging mirror group, located at the light exit side of the display panel, for imaging the display picture.

[0008] In some embodiments of the utility model, the light entrance surface of the first lens is a plane or a convex surface, and the light exit surface of the first lens is a convex surface;When the light entrance surface of the first lens is a convex surface, the curvature radius of the light entrance surface of the first lens is greater than the curvature radius of the light exit surface of the first lens.

[0009] In some embodiments of the utility model, the light entrance surface of the second lens is a plane or a convex surface, and the light exit surface of the second lens is a convex surface.

[0010] In some embodiments of the utility model, the first lens and the second lens are spherical lenses, or the first lens and / or the second lens are aspherical lenses.

[0011] In some embodiments of the utility model, the light entrance surface of the aspherical lens is a plane, and the light exit surface of the aspherical lens is a free curved surface.

[0012] In some embodiments of the utility model, the optical thickness of the lens with a smaller distance from the light source is greater than the optical thickness of the lens with a greater distance from the light source, and the optical thickness is the product of the thickness of the lens on the optical axis and the refractive index of the lens.

[0013] In some embodiments of the utility model, the aperture of the lens with a greater distance from the light source in the direction perpendicular to the optical axis is greater than the aperture of the lens with a smaller distance from the light source in the direction perpendicular to the optical axis.

[0014] In some embodiments of the utility model, the distance between the two adjacent lenses with a greater distance from the light source on the optical axis is greater than the distance between the two adjacent lenses with a smaller distance from the light source on the optical axis.

[0015] In some embodiments of the utility model, the illumination lens group further comprises:

[0016] The third lens is located on the light exit side of the second lens, and the third lens is a Fresnel lens.

[0017] In some embodiments of the utility model, the distance between the third lens and the second lens on the optical axis is less than or equal to the distance between the second lens and the first lens on the optical axis.

[0018] In some embodiments of the utility model, the light entrance surface of the third lens is a plane, and the light exit surface of the third lens is a textured surface.

[0019] In some embodiments of the utility model, the length of the illumination lens group on the optical axis is less than or equal to 15mm.

[0020] In some embodiments of the utility model, the imaging lens group comprises a plurality of imaging lenses arranged in sequence along the light path propagation direction, and the plurality of imaging lenses comprise at least one Fresnel lens, and the at least one Fresnel lens is located on the side close to the display panel in the imaging lens group.

[0021] In some embodiments of the utility model, the imaging lens group includes first imaging lens, second imaging lens and third imaging lens which are sequentially arranged along the direction of light path propagation, the first imaging lens is Fresnel lens, the second imaging lens is spherical lens, and the third imaging lens is aspherical lens.

[0022] In some embodiments of the utility model, the light-in surface of the first imaging lens is textured surface, and the light-out surface of the first imaging lens is plane, the light-in surface of the second imaging lens is convex surface, and the light-out surface of the second imaging lens is concave surface, the light-in surface of the third imaging lens is concave surface, and the light-out surface of the third imaging lens is convex surface.

[0023] In some embodiments of the utility model, the imaging lens group includes first imaging lens, second imaging lens and third imaging lens which are sequentially arranged along the direction of light path propagation, the first imaging lens is Fresnel lens, the second imaging lens is Fresnel lens, and the third imaging lens is spherical lens.

[0024] In some embodiments of the utility model, the light-in surface of the first imaging lens is textured surface, and the light-out surface of the first imaging lens is plane, the light-in surface of the second imaging lens is textured surface, and the light-out surface of the second imaging lens is plane, the light-in surface of the third imaging lens is concave surface, and the light-out surface of the third imaging lens is convex surface.

[0025] In some embodiments of the utility model, the imaging lens group includes first imaging lens, second imaging lens, third imaging lens and fourth imaging lens which are sequentially arranged along the direction of light path propagation, the first imaging lens is Fresnel lens, the second imaging lens is spherical lens, the third imaging lens is spherical lens, and the fourth imaging lens is spherical lens.

[0026] In some embodiments of the utility model, the light-in surface of the first imaging lens is textured surface, and the light-out surface of the first imaging lens is plane, the light-in surface of the second imaging lens is convex surface, and the light-out surface of the second imaging lens is concave surface, the light-in surface of the third imaging lens is concave surface, and the light-out surface of the third imaging lens is convex surface, and the light-in surface of the fourth imaging lens is concave surface, and the light-out surface of the fourth imaging lens is convex surface.

[0027] In some embodiments of the utility model, the focal length of the first imaging lens is less than or equal to 35mm, and the length of the imaging lens group on the optical axis is less than or equal to 30mm.

[0028] In some embodiments of the utility model, the illumination lens group and the imaging lens group satisfy the following relationship:

[0029]

[0030] Wherein, F represents the aperture number of the imaging lens group, F≤2.0, f represents the focal length of the imaging lens group, D represents the entrance pupil diameter of the imaging lens group, n represents the refractive index of air, and θ represents the emitting angle of the light beam emitted by the illumination lens group.

[0031] The utility model has the advantages that:

[0032] The vehicle lamp projection device provided by the utility model comprises a light source, an illumination lens group located on the light emitting side of the light source, the illumination lens group comprising at least a first lens and a second lens arranged in sequence along the light path propagation direction, the first lens having positive focal power, the distance between the first lens and the light source being smaller than the focal length of the first lens, the first lens being used for expanding the light beam emitted by the light source, the second lens having positive focal power and being used for collimating the light beam emitted by the first lens, a display panel located on the light emitting side of the illumination lens group and used for modulating the light emitted by the illumination lens group to form a display picture, and an imaging lens group located on the light emitting side of the display panel and used for imaging the display picture. The light beam emitted by the light source passes through the two lenses with positive focal power in the illumination lens group, the emitting angle of the light beam is sequentially reduced, the light spot energy on the display panel is more concentrated, the brightness of the display picture is improved, the brightness of the projection picture after the display picture is imaged by the imaging lens group is improved, and the number of lenses in the illumination lens group is small, so that the miniaturization design requirement of the vehicle lamp projection product can be met. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings needed to be used in the embodiments of the utility model will be briefly introduced as follows. Obviously, the drawings introduced as follows are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0034] Figure 1 The structure schematic diagram of the vehicle lamp projection device provided by the embodiments of the utility model is shown in the figure.

[0035] Figure 2 The structure schematic diagram of the illumination assembly provided by the embodiments of the utility model is shown in the figure.

[0036] Figure 3 The structure schematic diagram of another illumination assembly provided by the embodiments of the utility model is shown in the figure.

[0037] Figure 4 The light path diagram in the another illumination assembly provided by the embodiments of the utility model is shown in the figure.

[0038] Figure 5 The light spot intensity distribution diagram at the liquid crystal display panel provided by the embodiments of the utility model is shown in the figure.

[0039] Figure 6 A light spot intensity distribution diagram at the liquid crystal layer is provided for the embodiment of the utility model;

[0040] Figure 7 A light spot intensity distribution diagram at the liquid crystal layer is provided for the embodiment of the utility model;

[0041] Figure 8 A light spot intensity distribution diagram at the liquid crystal layer is provided for the embodiment of the utility model;

[0042] Figure 9 A light spot intensity distribution diagram at the liquid crystal layer is provided for the embodiment of the utility model;

[0043] Figure 10 A structure schematic diagram of the imaging lens is provided for the embodiment of the utility model;

[0044] Figure 11 A point column diagram is provided for the embodiment of the utility model;

[0045] Figure 12 A modulation transfer function curve diagram is provided for the embodiment of the utility model;

[0046] Figure 13 A geometry distortion diagram is provided for the embodiment of the utility model;

[0047] Figure 14 A direct projection effect schematic diagram of the imaging lens is provided for the embodiment of the utility model;

[0048] Figure 15 A side projection effect schematic diagram of the imaging lens is provided for the embodiment of the utility model;

[0049] Figure 16 A structure schematic diagram of the imaging lens is provided for the embodiment of the utility model;

[0050] Figure 17 A structure schematic diagram of the imaging lens is provided for the embodiment of the utility model;

[0051] Figure 18 A structure schematic diagram of the optical device in the vehicle lamp projection device is provided for the embodiment of the utility model;

[0052] Figure 19 A structure schematic diagram of the optical device in the vehicle lamp projection device is provided for the embodiment of the utility model;

[0053] Figure 20 A structure schematic diagram of the optical device in the vehicle lamp projection device is provided for the embodiment of the utility model;

[0054] Figure 21 A structure schematic view of an optical device in a car lamp projection device provided by the embodiment of the present application is shown in the figure.

[0055] Figure 22 A structure schematic view of an optical device in a car lamp projection device provided by the embodiment of the present application is shown in the figure.

[0056] Mark explanation:

[0057] 100 - housing, 200 - heat dissipation device, 300 - lighting assembly, 310 - light source, 320 - lighting lens group, 321 - first lens, 322 - second lens, 323 - third lens, 400 - projection lens, 40 - imaging lens group, 410 - first imaging lens, 420 - second imaging lens, 430 - third imaging lens, 440 - fourth imaging lens, S - diaphragm, 500 - display panel / liquid crystal display panel, 510 - first substrate, 520 - liquid crystal layer, 530 - second substrate. DETAILED DESCRIPTION

[0058] In order to make the above-mentioned purpose, features and advantages of the present application more obvious and easy to understand, the present application will be further described below in combination with the drawings and examples. However, the example embodiments can be implemented in various forms, and should not be understood as being limited to the embodiments described herein; on the contrary, these embodiments are provided so that the present application is more comprehensive and complete, and the concept of the example embodiments is fully conveyed to those skilled in the art. The same reference numerals in the drawings represent the same or similar structures, so repeated description thereof will be omitted. The words expressing position and direction described in the present application are described with the drawings as an example, but changes can also be made as needed, and the changes made are included in the protection scope of the present application. The drawings of the present application are only used to show the relative position relationship and do not represent the real proportion.

[0059] Figure 1 A structure schematic view of a car lamp projection device provided by the embodiment of the present application is shown in the figure.

[0060] As Figure 1As shown, the vehicle lamp projection device comprises an illumination assembly 300, a display panel 500 and a projection lens 400, the illumination assembly 300, the display panel 500 and the projection lens 400 are integrated in a housing 100, and a heat sink can be arranged on one side of the housing 100 for dissipating heat of the internal devices of the device, so that the device can normally operate and its service life is prolonged. In actual application, the projection lens 400 can also be designed to be detachable, so as to match the projection lens 400 according to different requirements, and the specific structure of the housing 100 and the heat sink can be designed according to actual requirements, and the utility model only designs the optical devices of the vehicle lamp projection device, that is, the illumination assembly 300, the display panel 500 and the projection lens 400.

[0061] The illumination assembly 300 comprises a light source 310 and an illumination lens group 320, the illumination lens group 320 is located on the light exit side of the light source 310, and the light emitted by the light source 310 is adjusted by the illumination lens group 320 and used for providing uniform illumination with sufficient brightness for the liquid crystal display panel 500; the display panel 500 is located on the light exit side of the illumination assembly 300 and can adopt a liquid crystal display panel, the liquid crystal display panel 500 comprises oppositely arranged first and second substrates, wherein a containing space is formed between the first and second substrates and used for filling a liquid crystal layer, in order to avoid liquid crystal leakage, the sizes of the first and second substrates are greater than the size of the liquid crystal layer, the liquid crystal display panel 500 modulates the transmittance and reflectivity of incident light based on the birefringence effect of liquid crystal, and the light emitted by the illumination lens group 320 forms a display picture after being modulated by the liquid crystal display panel 500; the projection lens group is located on the light exit side of the liquid crystal display panel 500 and used for imaging the display picture to form a projection picture at a set distance for a user to watch.

[0062] It can be seen that the performance of the illumination assembly 300 and the projection lens 400 is an important factor for determining the quality of the projection picture, and since the component actually used for modulating light in the liquid crystal display panel 500 is the liquid crystal layer, the size of the light beam emitted by the illumination assembly 300 should be as close as possible to the size of the liquid crystal layer, so as to fully utilize the light and improve the brightness of the display picture, and the brightness of the display picture directly determines the brightness of the projection picture formed by imaging the display picture by the projection lens 400. Therefore, the utility model designs the lens composition in the illumination assembly 300 and the projection lens 400, so as to realize high-brightness projection display.

[0063] The following first describes various embodiments of the illumination assembly 300.

[0064] Lighting assembly embodiment 1:

[0065] Figure 2 The structure schematic diagram of the illumination assembly provided in the utility model embodiment.

[0066] As Figure 2As shown, the illumination assembly 300 includes a light source 310 and an illumination lens group 320, and the illumination lens group 320 is located on the light exit side of the light source 310.

[0067] In the embodiment of the utility model, the light source 310 can adopt square light-emitting diode (LED for short) light source, the LED light source includes 4 rows and 4 columns of arrayed LED chips to ensure that the brightness of the light source 310 is enough to support high-brightness display and maintain a lower cost, the light source 310 emits square light spots, the light spots are matched with the shape of the liquid crystal display panel 500, are more convenient for regulation and control, and are beneficial to improving the uniformity of light spot energy and illuminance, thereby improving display quality. In actual application, the number, type, shape and arrangement mode of the light-emitting devices in the light source 310 can be selected according to the brightness requirement of the product, which is not limited in the embodiment of the utility model.

[0068] The illumination lens group 320 includes a first lens 321 and a second lens 322 arranged in sequence along the light path propagation direction, and the first lens 321 and the second lens 322 both have positive focal power. The lens with positive focal power can contract the light beam and improve the collimation of the light beam, so that the light rays in the light beam that exit at a large angle are deflected towards the optical axis, thereby the light beam emitted by the light source 310 has a smaller emission angle after passing through the first lens 321, and the light beam energy is more concentrated, and the light beam emitted by the first lens 321 has a further smaller emission angle after passing through the second lens 322, and the light beam energy is further concentrated.

[0069] According to the imaging law of the lens with positive focal power, when the distance between the object and the lens is within one focal length of the lens, an enlarged virtual image can be formed on the same side of the object point, and the distance between the virtual image and the lens and the size of the virtual image are related to the distance between the object and the lens. The larger the distance between the object and the lens, the larger the virtual image. It can be understood that adjusting the distance between the light source 310 and the lens within the focal length range of the lens can adjust the emission angle of the light beam emitted by the lens, so that the light spot formed by the light beam emitted by the lens reaches the required size.

[0070] In the embodiment of the utility model, the distance between the first lens 321 and the light source 310 is less than the focal length of the first lens 321. By setting the distance between the first lens 321 and the light source 310 to a certain value, the size of the light spot formed by the light beam emitted by the first lens 321 can be close to the size of the liquid crystal layer 520 in the liquid crystal display panel 500. For example, the focal length of the first lens 321 is 13 mm, and the distance between the first lens 321 and the light source 310 is 0-1 mm. In one possible implementation, the first lens 321 is arranged close to the light exit surface of the light source 310.

[0071] In the embodiment of the utility model, the illumination mirror group 320 includes the first lens 321 and the second lens 322 with positive focal length, the light beam emitted by the light source 310 passes through the first lens 321 and the second lens 322 in turn, and the light emitting angle of the light beam is reduced in turn, so that the light beam energy incident to the liquid crystal display panel 500 can be concentrated in a smaller range, and the size of the light beam is adjusted to be similar to the liquid crystal display panel 500 through the first lens 321, and then collimated through the second lens 322, which can further approach the size of the liquid crystal display panel 500, so that the size of the light spot projected to the liquid crystal display panel 500 can match the size of the liquid crystal display panel 500, which is beneficial to improve the utilization rate of the light emitted by the light source 310, realize high brightness display, and further improve the brightness of the projection picture. In addition, the illumination mirror group 320 only includes two lenses, which is beneficial to reduce the volume of the illumination mirror group 320 and meet the design requirement of miniaturization of the projection device.

[0072] In the specific implementation, the illumination mirror group 320 can further include a larger number of lenses for further adjusting the size, collimation degree and uniformity of the light beam emitted by the second lens 322, and the number of lenses in the illumination mirror group 320 is not limited in the embodiment of the utility model, and the case that the illumination mirror group 320 includes a larger number of lenses is specifically described in the following illumination assembly embodiment 2 and embodiment 5.

[0073] As shown in Figure 2 In the embodiment of the utility model, the light source 310, the first lens 321 and the second lens 322 are coaxially arranged, the coaxial design is beneficial to maintain the symmetry of the light beam, thereby improving the uniformity of the display picture, and also beneficial to reduce the volume of the illumination mirror group 320. In order to facilitate processing, the first lens 321 and the second lens 322 can be spherical lenses.

[0074] Specifically, the first lens 321 is a spherical lens, and the light entrance surface and the light exit surface of the first lens 321 are spherical surfaces, wherein the light entrance surface of the first lens 321 is a plane or a convex surface, the light exit surface of the first lens 321 is a convex surface, that is, the first lens 321 is a plano-convex lens or a biconvex lens, and when the light entrance surface of the first lens 321 is a convex surface, the curvature radius of the light entrance surface of the first lens 321 is greater than the curvature radius of the light exit surface of the first lens 321, so that the first lens 321 can have positive focal length. In actual application, in order to better fit the light emitting surface of the light source 310 and compress the distance between the first lens 321 and the light source 310 and the length of the overall light path, the light entrance surface of the first lens 321 is usually a plane, and in addition, setting the lens surface to be a plane can also reduce the processing difficulty of the lens.

[0075] The second lens 322 is a spherical lens, and the light entrance surface and the light exit surface of the second lens 322 are spherical surfaces. The light entrance surface of the second lens 322 is a flat surface or a convex surface, the light exit surface of the second lens 322 is a convex surface, that is, the second lens 322 is a plano-convex lens or a biconvex lens, and when the light entrance surface of the second lens 322 is a convex surface, the radius of curvature of the light entrance surface of the second lens 322 is greater than the radius of curvature of the light exit surface of the first lens 321, so that the second lens 322 can have a positive focal power.

[0076] In the embodiment of the utility model, the parameters of the lenses are as follows: the radius of curvature of the light entrance surface of the first lens 321 is greater than 7 mm, the radius of curvature of the light exit surface of the first lens 321 is 4 mm to 7 mm, the thickness of the first lens 321 on the optical axis is 2.9 mm to 4 mm, and the aperture of the first lens 321 in the direction perpendicular to the optical axis is 3.8 mm to 20 mm. In a possible implementation, the light entrance surface of the first lens 321 is a flat surface, the radius of curvature of the light exit surface of the first lens 321 is 6.873 mm, the thickness of the first lens 321 on the optical axis is 2.9 mm, and the aperture of the first lens 321 in the direction perpendicular to the optical axis is 4.5 mm.

[0077] The radius of curvature of the light entrance surface of the second lens 322 is greater than 40 mm, the radius of curvature of the light exit surface of the second lens 322 is 25 mm to 40 mm, the thickness of the second lens 322 on the optical axis is greater than the thickness of the first lens 321 on the optical axis and less than 5 mm, the aperture of the second lens 322 in the direction perpendicular to the optical axis is greater than the aperture of the first lens 321 in the direction perpendicular to the optical axis, and the distance between the second lens 322 and the first lens 321 on the optical axis is 0 to 4 mm. In a possible implementation, the radius of curvature of the light entrance surface of the second lens 322 is 50 mm, the radius of curvature of the light exit surface of the second lens 322 is 25 mm, the thickness of the second lens 322 on the optical axis is 4.7 mm, the aperture of the second lens 322 in the direction perpendicular to the optical axis is 9.5 mm, and the distance between the second lens 322 and the first lens 321 on the optical axis is 3.6 mm.

[0078] Lighting assembly embodiment 2:

[0079] Figure 3 The structure diagram of the lighting assembly provided in the embodiment of the utility model is shown.

[0080] As Figure 3As shown, the difference between the embodiment of the utility model and the lighting assembly embodiment 1 lies in that the lighting mirror group 320 further includes a third lens 323, the third lens 323 is located at the light exit side of the second lens 322, the third lens 323 is a Fresnel lens, by the texture surface structure of the Fresnel lens is designed, the exit direction of the light that is incident to its inside can be more fine adjustment, thereby the third lens 323 can be used to collimate and homogenize the light beam that the second lens 322 emits, further improve the collimation of the light beam that is emitted to the liquid crystal display panel 500.

[0081] The interval of the third lens 323 and the second lens 322 on the optical axis is less than or equal to the interval of the second lens 322 and the first lens 321 on the optical axis. This is because the lens closer to the light source 310 needs better deflection ability of light, the angle of light deflection is larger, and the light beam needs a longer distance to diverge to the required state, then the light beam emitted by the second lens 322 only needs a shorter propagation distance compared with the light beam emitted by the first lens 321.

[0082] Exemplarily, the interval of the third lens 323 and the second lens 322 on the optical axis and the interval of the second lens 322 and the first lens 321 on the optical axis can satisfy the following proportional relationship: ΔD 12 = ΔD 23 *k, wherein, ΔD 12 represents the interval of the second lens 322 and the first lens 321 on the optical axis, ΔD 23 represents the interval of the third lens 323 and the second lens 322 on the optical axis, 1≤k≤4. In a possible implementation, the interval of the third lens 323 and the second lens 322 on the optical axis is 1.15mm, and the interval of the second lens 322 and the first lens 321 on the optical axis is 3.6mm.

[0083] Specifically, the light entrance surface of the third lens 323 can be a plane, and the light exit surface of the third lens 323 can be a texture surface. The light enters the Fresnel lens from the plane, is refracted in the Fresnel lens, and the angle of the light is changed when the light exits by using the structure of the texture surface. In this way, the light is more regular when entering the Fresnel lens, and the state of the light is easy to control.

[0084] In order to make the lighting effect of the lighting mirror group 320 more intuitive and visible, the embodiment of the utility model provides a specific design parameter of the lighting assembly 300 (as shown in Table 1 below), and a test result simulated by using optical design software according to the design parameter.

[0085]

[0086] Table 1

[0087] Wherein, the surface numbered 0 represents the light source 310, the surfaces numbered 1-6 are the lens surfaces through which the light beams emitted by the light source 310 pass in turn, and the interval represents the interval of the surface corresponding to the number and the previous surface on the optical axis.

[0088] Figure 4 The light path diagram in the lighting assembly provided by the embodiment of the utility model.

[0089] As Figure 4 shown, the light beams emitted by the light source 310 gradually diffuse to the required size between the first lens 321 and the second lens 322 after passing through the first lens 321, and are incident to the third lens 323 after collimating through the second lens 322, and the third lens 323 further improves the collimation degree of the light beams.

[0090] Figure 5 The light spot intensity distribution diagram at the liquid crystal display panel provided by the embodiment of the utility model.

[0091] Figure 5 The light spot intensity distribution shown can reflect the energy distribution of different light emitting angles of the light beams when propagating to the liquid crystal display panel 500, and Figure 5 It can be seen that when the light beams propagate to the light entrance surface of the liquid crystal display panel 500, the light emitting angle is within the range of ± 16°, and it can be seen that the lighting mirror group 320 provided by the embodiment of the utility model can concentrate the light beam energy in a smaller range, the light beam divergence degree is small, and the light spot energy received by the liquid crystal display panel 500 is higher.

[0092] Specifically, the light source 310 is an LED light source, the light emitting angle of which is 180° (i.e. ± 90°), the first lens 321 can shrink the light emitting angle of the light beams to 160° (i.e. ± 80°), the second lens 322 can shrink the light emitting angle of the light beams to 40° (i.e. ± 20°), and the third lens 323 can shrink the light emitting angle of the light beams to 32° (i.e. ± 16°).

[0093] Figure 6 The light spot illuminance distribution diagram at the liquid crystal layer provided by the embodiment of the utility model; Figure 7 The illuminance distribution diagram of the light not used by the liquid crystal layer provided by the embodiment of the utility model.

[0094] Combined Figure 6 and Figure 7 It can be seen that the light beams emitted by the light source 310 form a circular light spot on the light entrance surface of the liquid crystal display panel 500 after passing through the lighting mirror group 320, in order to ensure the symmetry of the light spot, in the embodiment of the utility model, the central axis of the liquid crystal display panel 500 coincides with the optical axis of the light beams emitted by the lighting mirror group 320.

[0095] In the prior art, in order to make the light spot cover the liquid crystal layer 520 Figure 6The light spot is generally circumscribed at least on the edge of the liquid crystal layer 520, which inevitably causes a certain light loss, and in the embodiment of the utility model, the edge of the light spot is inside the edge of the liquid crystal layer 520 near the corner of the liquid crystal layer 520, and the edge of the light spot slightly exceeds the edge of the liquid crystal layer 520 near the side of the liquid crystal layer 520, so only a small part of light as shown can not be used by the liquid crystal layer 520, compared with the prior art, the light loss is less, the brightness of the light spot is higher, and it can be seen that the light spot received by the liquid crystal layer 520 has good uniformity. Figure 7 Figure 6

[0096] In the embodiment of the utility model, the shapes and sizes of the main components in the liquid crystal display panel 500 are as follows: the first substrate 510 and the first polarizing layer attached to the first substrate 510 are square structures with a length of 27mm and a width of 27mm, the liquid crystal layer 520 is a square structure of 0.85 inch, that is, the length is 15.27mm and the width is 15.27mm, and the second substrate 530 and the second polarizing layer attached to the second substrate 530 are square structures with a length of 27mm and a width of 27mm. The light beam emitted by the illumination mirror group 320 can form a circular light spot with a radius of 9mm on the light entrance surface of the liquid crystal display panel 500, the light spot size is close to the size of the liquid crystal layer 520, the light utilization rate is high, and it is beneficial to improve the brightness of the display picture.

[0097] Through testing, when the illumination mirror group 320 provided by the embodiment of the utility model is adopted, the geometric efficiency of light can reach more than 80%, the geometric efficiency is defined as the ratio of the light flux that can be used by the liquid crystal layer 520 to the total light flux emitted by the light source 310, when the coaxial scheme as shown in Figure 3 and Table 1 is adopted, the geometric efficiency of light can reach 86.7%, in the conventional liquid crystal projection device, the geometric efficiency of light is only 75%, and the utilization rate of light of the illumination mirror group 320 provided by the embodiment of the utility model is higher.

[0098] Lighting assembly embodiment 3:

[0099] In the embodiment of the utility model, at least one lens of the first lens 321 or the second lens 322 can adopt an aspheric lens, for example, the first lens 321 is an aspheric lens, and the second lens 322 is a spherical lens, at this time, the light entrance surface of the first lens 321 can be a plane, and the light exit surface of the first lens 321 can be a free curved surface, or the first lens 321 is a spherical lens, and the second lens 322 is an aspheric lens, at this time, the light entrance surface of the second lens 322 can be a plane, and the light exit surface can be a free curved surface, or the first lens 321 and the second lens 322 can both be aspheric lenses.

[0100] ​​The utility model embodiment takes the case that the first lens 321 adopts aspherical lens to carry out simulation test to the light spot received by the liquid crystal display panel 500. Among them, the light inlet surface of first lens 321 is plane, the light outlet surface of first lens 321 is free curved surface, and the shape of the free curved surface is symmetrical about the optical axis, to ensure that the light spot received by the liquid crystal display panel 500 is symmetrical. The value range of the design parameter of first lens 321 is as follows: the thickness of first lens 321 on the optical axis is 5.5mm~7.5mm, the aperture in the direction perpendicular to the optical axis is 7mm~8mm, the interval of first lens 321 and light source 310 on the optical axis is 0.1mm~0.5mm, and the interval of first lens 321 and second lens 322 on the optical axis is 3mm~4mm.

[0101] Figure 8 The utility model embodiment provides the light spot intensity distribution diagram at the liquid crystal display panel.

[0102] As Figure 8 Shown, the utility model embodiment, the light beam of the illumination mirror group 320 is transmitted to the light inlet surface of liquid crystal display panel 500, and the divergence angle of light beam is ±13 °, it can be seen that setting aspherical lens in the illumination assembly 300 can further contract light beam, and the light beam energy is more concentrated, satisfies higher brightness demand.

[0103] Figure 9 The utility model embodiment provides the light spot illumination distribution diagram at the liquid crystal display panel.

[0104] By Figure 6 It can be seen that, to meet the high brightness demand, the light spot can not cover the small area near the corner of liquid crystal layer 520, resulting in the dark corner of display picture, and by Figure 9 It can be seen that, by adaptively designing the surface shape of aspherical lens, the exit direction of light can be more finely adjusted, especially the edge light in the light beam can be targetedly adjusted, so that the light spot in the rectangular shape can be formed when the light beam is projected on the liquid crystal display panel 500, thereby the dark corner of display picture can be filled, the light utilization rate is further improved, and the high brightness, the integrity and uniformity of display picture are considered.

[0105] Lighting assembly embodiment 4:

[0106] In the utility model embodiment, at least one of light source 310, first lens 321 and second lens 322 can be coaxial with other devices, at this time, at least one of first lens 321 and second lens 322 needs to adopt aspherical lens.

[0107] The non-coaxial design can be adapted to the irregular shape of the interior space of the vehicle lamp, meet the personalized design requirements, and the aspheric lens can more accurately adjust the propagation direction of the light, so that the light beam emitted by the illumination assembly 300 is symmetrical about the optical axis, thereby making the light spot projected on the liquid crystal display panel 500 have better uniformity.

[0108] The following describes various embodiments of the projection lens 400, which images the display picture to form a projection picture through the imaging lens group 40, the imaging lens group 40 includes a plurality of imaging lenses arranged in sequence along the light path propagation direction, and the plurality of imaging lenses include at least one Fresnel lens, the at least one Fresnel lens is located on the side of the imaging lens group 40 close to the liquid crystal display panel 500, the Fresnel lens has the characteristics of strong condensing ability, low thickness and customizable design, can more finely adjust the light, provide clear imaging and high brightness, is conducive to improving the imaging quality and reducing the number of lenses in the imaging lens group 40, and meets the design requirements of high brightness and small size.

[0109] Lighting assembly embodiment 5:

[0110] In the embodiment of the utility model, the illumination lens group 320 further includes at least one fourth lens, and the at least one fourth lens is located between the second lens 322 and the third lens 323. The fourth lens can be used to further adjust the size of the light beam emitted by the second lens 322 and improve the collimation degree of the light beam.

[0111] According to the design idea of the embodiment of the utility model, in the above-mentioned illumination assembly embodiment, each lens in the illumination lens group 320 should meet the following rules:

[0112] Rule 1: Except for the third lens 323, the optical thickness of the lens with a smaller distance from the light source is greater than the optical thickness of the lens with a larger distance from the light source, and the optical thickness is the product of the thickness of the lens on the optical axis and the refractive index of the lens. Wherein, the refractive index of the lens is determined by the material of the lens, when the materials of the lenses are the same, the thickness of the lens on the optical axis closer to the light source 310 is greater. For example, the optical thickness of the first lens 321 is greater than the optical thickness of the second lens 322.

[0113] The greater the optical thickness of the lens, the greater the optical path of the light in the lens, and the more obvious the trend of the light changes, so it can be understood that the closer to the light source 310, the greater the divergence degree of the light beam, and the closer to the light source 310, the greater the optical thickness of the lens, so that the light can reach a large enough optical path in a shorter physical distance, thereby facilitating the reduction of the physical length of the projection device.

[0114] Rule 2: The lens with greater distance from the light source 310 has a larger aperture in the direction perpendicular to the optical axis than the lens with smaller distance from the light source 310. For example, the third lens 323 has a larger aperture in the direction perpendicular to the optical axis than the second lens 322, and the second lens 322 has a larger aperture in the direction perpendicular to the optical axis than the first lens 321.

[0115] This is because although the first lens 321 and the second lens 322 can both reduce the divergence angle of the light beam, the overall trend of the light beam is still divergent, so the size of the light spot of the light beam emitted by the light source 310 projected on the first lens 321 is smaller than the size of the light spot of the light beam emitted by the first lens 321 projected on the second lens 322. Therefore, in order to avoid light loss, the aperture of the second lens 322 should be larger than the aperture of the first lens 321, so that the light rays emitted by the first lens 321 can all enter the second lens 322 when propagating to the second lens 322. Similarly, if the light beam still has a divergent trend after passing through the second lens 322, the apertures of the fourth lens arranged in the direction of the light path should be increased in turn in the direction perpendicular to the optical axis, so as to avoid light loss.

[0116] In theory, the radius of curvature of the spherical lens can be calculated according to the thickness of the lens and the aperture of the lens, but due to process limitations, the two end surfaces of the lens in the direction perpendicular to the optical axis are flat surfaces, which are used to connect the light entrance surface and the light exit surface of the lens. Therefore, when designing the lens, the width of the above-mentioned flat surface on the optical axis is considered, and the radius of curvature of the light entrance surface and the light exit surface of the spherical lens can also be limited. In the present application, when the lenses in the lighting assembly 320 are spherical lenses, the radius of curvature of the light entrance surface and the light exit surface of the first lens 321 is smaller than the radius of curvature of the light entrance surface and the light exit surface of the second lens 322. The farther the lens is from the light source 310, the larger the radius of curvature of the light entrance surface and the light exit surface thereof.

[0117] Rule 3: Except for the third lens 323, the distance between the two adjacent lenses with greater distance from the light source 310 on the optical axis is greater than the distance between the two adjacent lenses with smaller distance from the light source 310 on the optical axis. For example, the distance between the second lens 322 and the fourth lens adjacent thereto on the optical axis is greater than the distance between the second lens 322 and the first lens 321 on the optical axis. In addition, the distance between the second lens 322 and the first lens 321 on the optical axis is greater than the distance between the first lens 321 and the light source 310 on the optical axis.

[0118] This is because the light beam after the lens light angle decreases, need to spread a certain distance to form the required size of the spot, and the illumination lens 320 by the first lens 321 to bear the main function of adjusting the size of the spot, light through the first lens 321 deflection angle relative to the subsequent optical path on the lens is larger, therefore, the light source 310 is farther away from the two adjacent lenses on the optical axis spacing should be greater than the light source 310 is closer to the two adjacent lenses on the optical axis spacing.

[0119] Imaging lens assembly embodiment 1:

[0120] Figure 10 The structure diagram of the imaging lens group provided by the embodiment of the utility model. Figure 10 The lens composition and the light propagation path in the imaging lens group 40 are schematically shown in the middle. It can be understood that, to avoid the illustration being too cluttered, Figure 10 Only half of the light beam emitted from the liquid crystal display panel to the imaging lens group is schematically shown, and the other half of the light beam is symmetrical to the half light beam shown about the optical axis. The same applies to the following embodiments.

[0121] As Figure 10 shown, in the embodiment of the utility model, the imaging lens group 40 comprises first imaging lens 410, second imaging lens 420 and third imaging lens 430 which are sequentially arranged along the light path propagation direction, wherein the first imaging lens 410 is a Fresnel lens, the second imaging lens 420 is a spherical lens, and the third imaging lens 430 is an aspherical lens. The display picture is sequentially imaged by the first imaging lens 410, the second imaging lens 420 and the third imaging lens 430. For the convenience of description, the image formed by the display picture through the first imaging lens 410 is called the first imaging, the image formed by the first imaging through the second imaging lens 420 is called the second imaging, and the image formed by the second imaging through the third imaging lens 430 is called the third imaging.

[0122] The light emitted by the liquid crystal display panel 500 is parallel light or approximately parallel light, and the first imaging lens 410 is used to converge the light, and the display image forms an enlarged virtual image through the first imaging lens 410; the second imaging lens 420 and the third imaging lens 430 are provided with a diaphragm S, the second imaging lens 420 is used to further converge the light, and the light beam converges and then diverges between the second imaging lens 420 and the third imaging lens 430, so that the light beam can enter the third imaging lens 430 through the diaphragm S, the first image forms a reduced real image through the second imaging lens 420, and the second image is located between the second imaging lens 420 and the third imaging lens 430; the third lens 323 is used to adjust the size of the light beam to meet the magnification requirement of the projection device, the second image forms an enlarged real image through the third imaging lens 430, and the third lens 323 adopts an aspherical design, which can correct chromatic aberration, distortion, spherical aberration, coma, astigmatism and other aberrations, and improve the imaging quality.

[0123] To achieve the above functions, the specific designs of the first imaging lens 410, the second imaging lens 420 and the third imaging lens 430 are as follows:

[0124] The first imaging lens 410 is a Fresnel lens, the entrance surface of which is a textured surface, and the exit surface is a plane. The distance between the first imaging lens 410 and the liquid crystal display panel 500 is less than the focal length of the first imaging lens 410, so that the first image is a virtual image, and the focal length of the first imaging lens 410 should be set to a small value to meet the design requirement of small size, wherein the focal length of the first imaging lens 410 is less than or equal to 35 mm, and the distance between the first imaging lens 410 and the liquid crystal display panel 500 is 4 mm to 8 mm. The orthographic projection of the liquid crystal display panel 500 in the optical axis direction falls within the orthographic projection range of the first imaging lens 410 in the optical axis direction, that is, the size of the first imaging lens 410 should be greater than or equal to the size of the liquid crystal display panel 500, so that the light emitted by the liquid crystal display panel 500 can be fully incident to the first imaging lens 410.

[0125] In a possible implementation, the focal length of the first imaging lens 410 is 25 mm, the distance between the first imaging lens 410 and the liquid crystal display panel 500 is 4 mm, the length of the first imaging lens 410 is 27 mm, the width is 23 mm, and the thickness of the first imaging lens 410 is 1.6 mm;

[0126] The second imaging lens 420 is a spherical lens, the light entrance surface of which is a convex surface and the light exit surface of which is a concave surface. The curvature radius of the light entrance surface of the second imaging lens 420 is 10mm-12mm, the curvature radius of the light exit surface of the second imaging lens 420 is 45mm-47mm, the thickness of the second imaging lens 420 on the optical axis is less than or equal to 6mm, and the aperture of the second imaging lens 420 in the direction perpendicular to the optical axis can be less than the width of the first imaging lens 410 in the direction perpendicular to the optical axis.

[0127] In a possible implementation, the curvature radius of the light entrance surface of the second imaging lens 420 is 11.185mm. The curvature radius of the light exit surface of the second imaging lens 420 is 46.978mm, the thickness of the second imaging lens 420 is 3mm, and the aperture of the second imaging lens 420 in the direction perpendicular to the optical axis is 15mm.

[0128] The third imaging lens 430 is an aspherical lens, the light entrance surface of which is a concave surface and the light exit surface of which is a convex surface, and the light entrance surface and the light exit surface of which are both designed as aspherical surfaces, the surface shapes of which are asymmetric, and the surface parameters of which satisfy the even aspherical surface formula: wherein Z represents the sag, c represents the curvature, r represents the distance from the cross section to the axis, k represents the conic coefficient, and a i represents the i-th order coefficient of the even aspherical surface. In the embodiment of the utility model, the parameters of the light entrance surface and the light exit surface of the third lens 323 are fixed values and satisfy the 8th order even aspherical surface formula. In addition, the thickness of the third lens 323 on the optical axis is less than the thickness of the second lens 322 on the optical axis. In a possible implementation, the thickness of the third lens 323 on the optical axis is 5mm, and the aperture of the third lens 323 in the direction perpendicular to the optical axis is less than the aperture of the second lens 322 in the direction perpendicular to the optical axis. In a possible implementation, the aperture of the third lens 323 in the direction perpendicular to the optical axis is 12.6mm. The distance between the third imaging lens 430 and the second imaging lens 420 should be greater than the distance between the second imaging lens 420 and the first imaging lens 410. For example, the distance between the third lens 323 and the second lens 322 on the optical axis and the distance between the second lens 322 and the first lens 321 on the optical axis can satisfy the following proportional relationship: Δd 12 = Δd 23 *k, wherein Δd 12 represents the distance between the second imaging lens 420 and the first imaging lens 410 on the optical axis, Δd 23 represents the distance between the third imaging lens 430 and the second imaging lens 420 on the optical axis, and 0≤k≤0.7. In a possible implementation, the distance between the third imaging lens 430 and the second imaging lens 420 on the optical axis is 12.885mm.

[0129] To make the imaging effect of the imaging lens group 40 more intuitive and visible, this utility model embodiment provides specific design parameters of the imaging lens group (as shown in Table 2 below), and test results simulated using optical design software based on these design parameters.

[0130]

[0131] Table 2

[0132] Among them, surfaces numbered 1 to 6 are the surfaces of the imaging lens through which the light beam emitted from the liquid crystal display panel 500 passes in sequence, and the spacing represents the distance between the corresponding numbered surface and the previous surface on the optical axis. The even-order aspherical coefficients satisfied by the incident and emitting surfaces of the third lens 323 are shown in Table 3 below:

[0133]

[0134] Table 3

[0135] Figure 11 A dot diagram provided for an embodiment of this utility model.

[0136] Figure 11 The simulation depicted the positional distribution of red (wavelength 0.656273mm), green (wavelength 0.587562mm), and blue (wavelength 0.486133mm) light emitted from the LCD panel 500 on different image planes after passing through the imaging lens group. Figure 11 As can be seen, on each image plane, the image points are concentrated in a small area, and the root mean square radius (RMS radius) of the image points on each image plane is smaller than the side length of a single display pixel of the liquid crystal display panel 500 (the shape of a single display pixel is a square with a length of 150μm and a width of 150μm). This indicates that the diffusion of the image is small, and the images formed by adjacent display pixels through the imaging lens group 40 do not overlap, resulting in good clarity of the projected image.

[0137] Figure 12 The modulation transfer function curve provided for the embodiments of this utility model.

[0138] Depend on Figure 12 It can be seen that for light in the 0.4861μm~0.6563μm band, the modulation transfer function (MTF) value of the imaging lens group 40 at different spatial frequencies is greater than 0.2, which can meet the requirements for the clarity and contrast of the projected image.

[0139] Figure 13 Geometric distortion diagram provided for embodiments of this utility model.

[0140] Depend on Figure 13And simulation test results can know, the maximum geometric distortion of the imaging lens 40 is 0.7172%, the geometric distortion is less than 1%, the degree of geometric shape deviation of imaging is lower than the original shape (i.e. the shape of the display picture), and the imaging quality is higher.

[0141] Figure 14 The direct injection effect schematic diagram of the imaging lens provided by the embodiment of the utility model is shown by Figure 14 It can be seen that, in the case that the light is vertically or approximately vertically irradiated to the surface of the object, the light spot shape imaged by the imaging lens 40 in the embodiment of the utility model is regular and approximately symmetrically distributed, and the light spot energy distribution is relatively uniform, and the direct injection effect meets the requirements.

[0142] Figure 15 The side injection effect schematic diagram of the imaging lens provided by the embodiment of the utility model is shown by Figure 15 It can be seen that, in the case that the light is irradiated to the surface of the object at a certain angle (non-vertical angle), the light spot shape imaged by the imaging lens 40 in the embodiment of the utility model has small distortion, and the energy distribution difference of the light spot at each place is not large, and the side injection effect meets the requirements.

[0143] Imaging lens assembly embodiment 2:

[0144] Figure 16 The structure schematic diagram of the imaging lens provided by the embodiment of the utility model is shown by Figure 16 As shown in the figure, in the embodiment of the utility model, the imaging lens 40 comprises a first imaging lens 410, a second imaging lens 420 and a third imaging lens 430 arranged in sequence along the light path propagation direction, wherein the first imaging lens 410 is a Fresnel lens, the second imaging lens 420 is a Fresnel lens, and the third imaging lens 430 is a spherical lens.

[0145] The difference between the embodiment of the utility model and the embodiment 1 is that the second imaging lens 420 can adopt a Fresnel lens, by designing the texture surface of the second imaging lens 420, the second imaging lens 420 can have the function of reducing aberration, then the third imaging lens 430 can adopt a spherical lens, thereby reducing the design difficulty and production cost.

[0146] Specifically, in the embodiment of the utility model, the light entrance surface of the first imaging lens 410 is a texture surface, the light exit surface is a plane, the light entrance surface of the second imaging lens 420 is a texture surface, the light exit surface is a plane, and the light entrance surface of the third imaging lens 430 is a concave surface, and the light exit surface is a convex surface. The light enters the Fresnel lens from the texture surface of the Fresnel lens, and the small planes with different angles of the texture surface can be used to preliminarily adjust the angle of the light, and the light is emitted from the plane after propagating in the Fresnel lens, which can control the direction of the light early, and facilitate imaging with the subsequent lens in the imaging lens 40.

[0147] The parameter ranges of each imaging lens in this embodiment of the present invention are as follows: the thickness of the first imaging lens 410 is 1.6mm to 1.7mm, the distance between the first imaging lens 410 and the liquid crystal display panel 500 is greater than or equal to 4mm, and the length and width of the first imaging lens 410 are greater than the length and width of the liquid crystal display panel 500. For example, the length of the first imaging lens 410 is 22mm and the width is 22mm; the thickness of the second imaging lens 420 is 1.6mm to 1.7mm, and the length of the second imaging lens 420 is... The length and width of the liquid crystal display panel 500 are less than or equal to the length and width of the liquid crystal display panel 500. The distance between the second imaging lens 420 and the first imaging lens 410 on the optical axis is 11mm to 12mm. The radius of curvature of the light-incident surface of the third imaging lens 430 is 101mm to 103mm. The radius of curvature of the light-outceasing surface of the third lens 323 is 23mm to 25mm. The thickness of the third imaging lens 430 on the optical axis is 5mm. The distance between the third imaging lens 430 and the second imaging lens 420 on the optical axis is 16mm to 17mm.

[0148] Imaging lens assembly embodiment 3:

[0149] Figure 17 This is a schematic diagram of the imaging lens assembly provided in an embodiment of the present invention. Figure 17 As shown in the embodiment of this utility model, the imaging lens group 40 includes a first imaging lens 410, a second imaging lens 420, a third imaging lens 430, and a fourth imaging lens 440 arranged sequentially along the optical path propagation direction. The first imaging lens 410 is a Fresnel lens, the second imaging lens 420 is a spherical lens, the third imaging lens 430 is a spherical lens, and the fourth imaging lens 440 is a spherical lens. The second imaging lens 420, the third imaging lens 430, and the fourth imaging lens 440 are all spherical lenses. The design and manufacturing difficulty of the lenses is relatively low, which helps to reduce costs.

[0150] Depend on Figure 17 As can be seen, the first imaging lens 410 is used to form a magnified virtual image of the displayed image (i.e., the first image), and the second imaging lens 420 is used to form a reduced real image of the first image (i.e., the second image). Both the first imaging lens 410 and the second imaging lens 420 can reduce the light beam so that the light beam can be reduced to the aperture S between the second imaging lens 420 and the third imaging lens 430. Both the third imaging lens 430 and the fourth imaging lens 440 can be used to adjust the magnification of the light beam so as to form an image of the required size at a set position. The concave and convex surfaces between the second imaging lens 420, the third imaging lens 430 and the fourth imaging lens 440 cooperate with each other, which helps to reduce aberrations.

[0151] In the embodiment of the utility model, the parameter range of each imaging lens is as follows: the light entrance surface of the first imaging lens 410 is a textured surface, the light exit surface is a plane, the distance between the first imaging lens 410 and the liquid crystal display panel 500 is 0-4mm; the light entrance surface of the second imaging lens 420 is a convex surface, the light exit surface is a concave surface, the thickness of the second imaging lens 420 on the optical axis is 3mm-4mm, the aperture of the second imaging lens 420 perpendicular to the optical axis is 4mm-5mm, the distance between the second imaging lens 420 and the first imaging lens 410 on the optical axis is 10mm-13mm; the light entrance surface of the third imaging lens 430 is a concave surface, the light exit surface is a convex surface, the thickness of the third imaging lens 430 on the optical axis is 2.5mm-3.5mm, the aperture of the second imaging lens 420 perpendicular to the optical axis is 3mm-4mm, the distance between the third imaging lens 430 and the second imaging lens 420 on the optical axis is 8mm-9mm; the light entrance surface of the fourth imaging lens 440 is a concave surface, the light exit surface is a convex surface, the thickness of the fourth imaging lens 440 on the optical axis is 3mm-4mm, the aperture of the fourth imaging lens 440 perpendicular to the optical axis is 6mm-7mm, the distance between the fourth imaging lens 440 and the third imaging lens 430 on the optical axis is 5mm-6mm.

[0152] It is tested that when the imaging lens group 40 provided by the embodiment of the utility model is used, the geometric efficiency of light can reach more than 70%, here the geometric efficiency is defined as the ratio of the light flux of the projection picture and the total light flux emitted by the light source 310, it can be seen that the projection picture has high brightness, thereby being beneficial to improving the contrast and definition of the projection picture.

[0153] In the embodiment of the utility model, the car lamp projection device can include any one of the illumination assemblies in embodiments 1-4 and any one of the combinations of the imaging lens groups in embodiments 1-3, and the following examples are taken as examples.

[0154] Vehicle light projection arrangement embodiment 1:

[0155] Figure 18 The structure diagram of the optical device in the car lamp projection device provided by the embodiment of the utility model, Figure 18 The car lamp projection device in the embodiment of the utility model can include the combination of the illumination assembly embodiment 2 and the imaging lens group embodiment 1, and the optical device in the car lamp lens device includes the light source 310 and the first lens 321 (spherical lens), the second lens 322 (spherical lens), the third lens 323 (Fresnel lens), the first substrate 510, the liquid crystal layer 520, the second substrate 530, the first imaging lens 410 (Fresnel lens), the second imaging lens 420 (spherical lens), the third imaging lens 430 (aspherical lens) arranged in sequence along the light path propagation direction.

[0156] Vehicle light projection arrangement embodiment 2:

[0157] Figure 19 This is a schematic diagram of the optical components in the vehicle headlight projection device provided in an embodiment of the present invention, as shown below. Figure 19 As shown, the vehicle headlight projection device in this embodiment of the present invention includes a combination of the lighting component embodiment 2 and the imaging lens group embodiment 2. The optical components in the vehicle headlight lens device include a light source 310 and a first lens 321 (spherical lens), a second lens 322 (spherical lens), a third lens 323 (Fresnel lens), a first substrate 510, a liquid crystal layer 520, a second substrate 530, a first imaging lens 410 (Fresnel lens), a second imaging lens 420 (Fresnel lens), and a third imaging lens 430 (spherical lens) arranged sequentially along the light path propagation direction.

[0158] Vehicle light projection arrangement embodiment 3:

[0159] Figure 20 This is a schematic diagram of the structure of the optical components in the vehicle headlight projection device provided in an embodiment of the present invention, as shown below. Figure 20 As shown, the vehicle headlight projection device in this embodiment of the present invention includes a combination of the lighting component embodiment 2 and the imaging lens group embodiment 3. The optical components in the vehicle headlight lens device include a light source 310 and a first lens 321 (spherical lens), a second lens 322 (spherical lens), a third lens 323 (Fresnel lens), a liquid crystal display panel 500, a first imaging lens 410 (Fresnel lens), a second imaging lens 420 (spherical lens), and a third imaging lens 430 (aspherical lens) arranged sequentially along the light path propagation direction.

[0160] Vehicle light projection arrangement embodiment 4:

[0161] Figure 21 This is a schematic diagram of the optical components in the vehicle headlight projection device provided in an embodiment of the present invention, as shown below. Figure 21 As shown, the vehicle headlight projection device in this embodiment of the present invention includes a combination of the lighting component embodiment 3 and the imaging lens group embodiment 1. The optical components in the vehicle headlight lens device include a light source 310 and a first lens 321 (aspherical lens), a second lens 322 (spherical lens), a third lens 323 (Fresnel lens) arranged sequentially along the light path propagation direction, a first substrate 510, a liquid crystal layer 520, a second substrate 530, a first imaging lens 410 (Fresnel lens), a second imaging lens 420 (spherical lens), and a third imaging lens 430 (aspherical lens).

[0162] Vehicle light projection arrangement embodiment 5:

[0163] Figure 22A structure schematic view of the optical device in the vehicle lamp projection device provided by the embodiment of the utility model is shown in the figure, Figure 22 The vehicle lamp projection device in the embodiment of the utility model comprises the combination of the lighting assembly embodiment 3 and the imaging lens group embodiment 3, and the optical device in the vehicle lamp lens device comprises a light source 310 and first to fourth imaging lenses 410, 420, 430 and 440 arranged in sequence along the light path propagation direction.

[0164] In the above embodiment, the lighting lens group 320 and the imaging lens group 40 satisfy the following relationship:

[0165]

[0166] Wherein, F represents the aperture number of the imaging lens group 40, F≤2.0, f represents the focal length of the imaging lens group 40, D represents the entrance pupil diameter of the imaging lens group 40, n represents the refractive index of air, and θ represents the light-emitting angle of the light beam emitted by the lighting lens group 320.

[0167] In the conventional projection device, the value of F is usually about 3, which leads to great difficulty in the design of the imaging lens group 40, and the value of F is large, which means that the entrance pupil diameter of the imaging lens group 40 is small, resulting in less light quantity of the imaging lens group 40. The utility model limits the value of the aperture number F to F≥2.0, reduces the light-emitting angle of the light beam emitted by the lighting lens group 320 and increases the entrance pupil diameter of the imaging lens group 40, thereby improving the utilization rate of the light emitted by the light source 310 and improving the brightness of the projection display. In some embodiments of the utility model, the aperture number F of the imaging lens group 40 is 1.8-2.0. The brightness of the vehicle lamp projection device provided by the utility model can reach 150 lm.

[0168] In addition, in the utility model, the length of the lighting lens group 320 on the optical axis is less than or equal to 15 mm, the length of the imaging lens group 40 on the optical axis is less than or equal to 30 mm, the length of the liquid crystal display panel 500 on the optical axis is less than or equal to 6 mm, and the total length of the lighting lens group 320, the liquid crystal display panel 500 and the imaging lens group 40 on the optical axis is less than or equal to 54 mm. The optical device in the vehicle lamp projection device provided by the utility model occupies a small space and can be integrated in a 0.15L space, which has the advantages of high brightness and small volume.

[0169] While the preferred embodiments of the application have been described, those skilled in the art will note that various modifications and changes can be made thereto without departing from the spirit and scope of the application. Accordingly, it is intended that all such modifications and changes be included within the scope of the application as claimed.

[0170] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A vehicle lamp projection device, wherein, The application relates to an illumination assembly, which comprises a light source and an illumination lens group. The illumination lens group is located on the light emitting side of the light source. The illumination lens group comprises at least a first lens and a second lens arranged in sequence along the light path propagation direction, the first lens and the second lens both have positive focal power, and the spacing between the first lens and the light source is smaller than the focal length of the first lens. A display panel is located on the light emitting side of the illumination lens group and is used for modulating the light emitted by the illumination lens group to form a display picture. An imaging lens group is located on the light emitting side of the display panel and is used for imaging the display picture. The light incident surface of the first lens is a plane or a convex surface, and the light emitting surface of the first lens is a convex surface.

2. The vehicle lamp projection apparatus of claim 1, wherein, When the light incident surface of the first lens is a convex surface, the curvature radius of the light incident surface of the first lens is greater than the curvature radius of the light emitting surface of the first lens. The light incident surface of the second lens is a plane or a convex surface, and the light emitting surface of the second lens is a convex surface.

3. The vehicle lamp projection apparatus according to claim 1 or 2, wherein When the light incident surface of the second lens is a convex surface, the curvature radius of the light incident surface of the second lens is greater than the curvature radius of the light emitting surface of the first lens. The first lens and the second lens are spherical lenses, or the first lens and / or the second lens are aspherical lenses.

4. The vehicle lamp projection apparatus of claim 1, wherein, The light incident surface of the aspherical lens is a plane, and the light emitting surface of the aspherical lens is a free curved surface.

5. The vehicle lamp projection apparatus of claim 4, wherein, The optical thickness of the lens with smaller spacing from the light source is greater than the optical thickness of the lens with greater spacing from the light source, and the optical thickness is the product of the thickness of the lens on the optical axis and the refractive index of the lens.

6. The vehicle lamp projection apparatus of claim 1, wherein, The aperture of the lens with greater spacing from the light source in the direction perpendicular to the optical axis is greater than the aperture of the lens with smaller spacing from the light source in the direction perpendicular to the optical axis.

7. The vehicle lamp projection apparatus of claim 6, wherein, The spacing of the two adjacent lenses with greater spacing from the light source on the optical axis is greater than the spacing of the two adjacent lenses with smaller spacing from the light source on the optical axis.

8. The vehicle lamp projection apparatus of claim 1, wherein, The illumination lens group further comprises:

9. The vehicle lamp projection apparatus of claim 1, wherein, A third lens is located on the light emitting side of the second lens, and the third lens is a Fresnel lens. The spacing of the third lens and the second lens on the optical axis is smaller than or equal to the spacing of the second lens and the first lens on the optical axis.

10. The vehicle lamp projection apparatus of claim 9, wherein, The light incident surface of the third lens is a plane, and the light emitting surface of the third lens is a textured surface.

11. The vehicle lamp projection apparatus of claim 9 or 10, wherein, The length of the illumination lens group on the optical axis is smaller than or equal to 15 mm.

12. The vehicle lamp projection apparatus of claim 1, wherein, The imaging lens group comprises a plurality of imaging lenses arranged in sequence along the light path propagation direction, and the plurality of imaging lenses comprise at least one Fresnel lens, and the at least one Fresnel lens is located on the side of the imaging lens group close to the display panel.

13. The vehicle lamp projection apparatus of claim 1, wherein, The imaging lens group comprises a first imaging lens, a second imaging lens and a third imaging lens arranged in sequence along the light path propagation direction; the first imaging lens is a Fresnel lens, the second imaging lens is a spherical lens, and the third imaging lens is an aspherical lens.

14. The vehicle lamp projection apparatus of claim 13, wherein, The light incident surface of the first imaging lens is a textured surface, the light emitting surface of the first imaging lens is a plane, the light incident surface of the second imaging lens is a convex surface, the light emitting surface of the second imaging lens is a concave surface, the light incident surface of the third imaging lens is a concave surface, and the light emitting surface of the third imaging lens is a convex surface.

15. The vehicle lamp projection apparatus of claim 14, wherein, ​ 16. The vehicle lamp projection apparatus of claim 13, wherein, The imaging lens group comprises, in sequence along the direction of light path propagation, a first imaging lens, a second imaging lens and a third imaging lens, the first imaging lens is a Fresnel lens, the second imaging lens is a Fresnel lens, and the third imaging lens is a spherical lens.

17. The vehicle lamp projection apparatus of claim 16, wherein, The light entrance surface of the first imaging lens is a textured surface, and the light exit surface of the first imaging lens is a plane; the light entrance surface of the second imaging lens is a textured surface, and the light exit surface of the second imaging lens is a plane; the light entrance surface of the third imaging lens is a concave surface, and the light exit surface of the third imaging lens is a convex surface.

18. The vehicle lamp projection apparatus of claim 13, wherein, The imaging lens group comprises, in sequence along the direction of light path propagation, a first imaging lens, a second imaging lens, a third imaging lens and a fourth imaging lens, the first imaging lens is a Fresnel lens, the second imaging lens is a spherical lens, the third imaging lens is a spherical lens, and the fourth imaging lens is a spherical lens.

19. The vehicle lamp projection apparatus of claim 18, wherein, The light entrance surface of the first imaging lens is a textured surface, and the light exit surface of the first imaging lens is a plane; the light entrance surface of the second imaging lens is a convex surface, and the light exit surface of the second imaging lens is a concave surface; the light entrance surface of the third imaging lens is a concave surface, and the light exit surface of the third imaging lens is a convex surface; and the light entrance surface of the fourth imaging lens is a concave surface, and the light exit surface of the fourth imaging lens is a convex surface.

20. The vehicle lamp projection apparatus of any of claims 14-19, wherein, The focal length of the first imaging lens is less than or equal to 35 mm, and the length of the imaging lens group on the optical axis is less than or equal to 30 mm.

21. The vehicle lamp projection apparatus of claim 1, wherein, The illumination lens group and the imaging lens group satisfy the following relationship: wherein F represents the aperture number of the imaging lens group, F≤2.0, f represents the focal length of the imaging lens group, D represents the entrance pupil diameter of the imaging lens group, n represents the refractive index of air, and θ represents the emitting angle of the light beam emitted by the illumination lens group.

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