Projection lens group and waveguide display system

Abstract

The invention provides a projection lens group and a waveguide display system. The projection lens group sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side, the second lens has positive focal power; the third lens has negative focal power; the fourth lens has negative focal power; a fifth lens, wherein the fifth lens has positive focal power; wherein the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length f3 of the third lens, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens meet the following formula: 0 lt; 1 / f1 + 1 / f2 + 1 / f3 + 1 / f4 + 1 / f5lt; and 0.1. The projection lens group solves the problem that a projection lens group in the prior art is difficult to give consideration to high resolution, small size and high light efficiency at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging equipment, and in particular to a projection lens assembly and a waveguide display system. Background Art

[0002] With the continuous development of the field of optical imaging, various types of display devices have gradually appeared on the market. Especially in the field of augmented reality, it has attracted public attention due to its unique display effect. There are many types of augmented reality devices. Taking AR glasses as an example, there are some problems with the existing various types of AR glasses, such as the overall size of the projection lens group is too large and the brightness is too low. At the same time, Micro LED display chips, as high-brightness active light-emitting chips, are expected to overcome the current shortcomings of AR glasses in size and brightness, and have received a lot of attention.

[0003] At present, AR glasses using single green Micro LED as display chip have been launched. The product form of this type of AR glasses is close to the glasses that people wear everyday. They can be worn for a long time without getting tired, and have high application value in information prompting. Now the batch preparation technology of single red and single blue Micro LED chips has also matured, making it possible to develop single red and single blue AR glasses projection lens groups. If combined with three RGB monochrome projection lens groups, waveguide color combination also becomes a feasible full-color display solution.

[0004] Waveguide color synthesis usually uses an optical waveguide lens to couple the images projected by the three RGB monochrome projection lens groups into the optical waveguide lens through three coupling-in areas, and then transmits the coupled-out image light to the same coupling-out area through total reflection pupil expansion, and finally the full-color image is received by the user's human eye. Among them, the projection lens group needs to ensure that the energy of the light beam of the received image is efficiently transmitted, and it needs to withstand the high temperature radiation from the Micro LED display chip to maintain a high image resolution, which plays a pivotal role. At the same time, if a single projection lens group can be compatible with three RGB monochrome display chips at the same time, it will inevitably effectively reduce the cost of the AR optical machine. In addition, how to reduce the size of the AR optical machine while meeting the RGB monochrome projection function is also the key to achieving wider application.

[0005] That is to say, the projection lens assembly in the prior art has the problem that it is difficult to achieve high resolution, small size and high light efficiency at the same time. Summary of the invention

[0006] The main purpose of the present invention is to provide a projection lens assembly and a waveguide display system to solve the problem that the projection lens assembly in the prior art has high resolution, small size and high light efficiency and is difficult to achieve at the same time.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a projection lens group is provided, which includes, from the object side to the image side: a first lens, the first lens has positive focal power; a second lens, the second lens has positive focal power; a third lens, the third lens has negative focal power; a fourth lens, the fourth lens has negative focal power; and a fifth lens, the fifth lens has positive focal power; wherein the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length f3 of the third lens, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy the following relationship: 0<1 / f1+1 / f2+1 / f3+1 / f4+1 / f5<0.1.

[0008] Furthermore, the object-side surface of the first lens is convex, and the image-side surface is concave.

[0009] Furthermore, the object-side surface of the second lens is convex, and the image-side surface is concave.

[0010] Furthermore, the object-side surface of the third lens is convex, and the image-side surface is concave.

[0011] Furthermore, the object-side surface of the fourth lens element near the optical axis is convex, and the image-side surface is concave.

[0012] Furthermore, the object-side surface of the fifth lens element near the optical axis is convex, and the image-side surface is concave.

[0013] Furthermore, the projection lens assembly also includes an aperture stop, which is arranged on the object side of the first lens.

[0014] Furthermore, the projection lens assembly also includes a display chip, and the display chip is located on the image side of the fifth lens.

[0015] Furthermore, the focal length f of the projection lens assembly, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 1.6 <f / f1+f / f2<2。

[0016] Furthermore, the focal length f of the projection lens assembly and the focal length f3 of the third lens satisfy: 0.5<|f3 / f|<0.7.

[0017] Furthermore, the curvature radius R11 of the object side surface of the first lens and the curvature radius R12 of the image side surface of the first lens satisfy: 3 <R12 / R11<5。

[0018] Furthermore, the curvature radius R21 of the object side surface of the second lens and the curvature radius R22 of the image side surface of the second lens satisfy: 2 <R22 / R21<4。

[0019] Furthermore, the curvature radius R31 of the object side surface of the third lens and the curvature radius R32 of the image side surface of the third lens satisfy: 2.5 <R31 / R32<3。

[0020] Furthermore, the curvature radius R11 of the object side surface of the first lens and the curvature radius R21 of the object side surface of the second lens satisfy: 0.9 <R11 / R21<1.5。

[0021] Furthermore, the curvature radius R11 of the object side surface of the first lens and the curvature radius R31 of the object side surface of the third lens satisfy: 0.9 <R11 / R31<1.6。

[0022] Furthermore, the curvature radius R51 of the object side surface of the fifth lens and the curvature radius R11 of the object side surface of the first lens satisfy: 0.7 <R51 / R11<1.3。

[0023] Furthermore, the distance T from the object side of the first lens to the display chip on the optical axis satisfies: 5.5 mm <T<7mm。

[0024] Furthermore, the air spacing AT3 from the image side surface of the third lens to the object side surface of the fourth lens and the distance T from the object side surface of the first lens to the display chip on the optical axis satisfy: 0.21 <AT3 / T<0.3。

[0025] Furthermore, half of the maximum field of view HFOV of the projection lens assembly satisfies: 0° <HFOV<20°。

[0026] Furthermore, the aperture value Fno of the projection lens assembly satisfies: 1.3 <Fno<2.5。

[0027] Furthermore, the entrance pupil diameter EPD of the projection lens assembly satisfies: 1 mm <EPD<5mm。

[0028] Furthermore, at least one of the first to fifth lenses is a glass lens.

[0029] Furthermore, the Abbe number V1 of the first lens element and the Abbe number V2 of the second lens element satisfy: V1+V2>100.

[0030] Furthermore, a minimum value Vmin of the Abbe numbers of the first lens to the fifth lens satisfies: Vmin<25.

[0031] Furthermore, a maximum value Vmax of the Abbe numbers in the first lens to the fifth lens satisfies: Vmax>40.

[0032] Furthermore, a maximum value Nmax of the refractive index of the first lens to the fifth lens satisfies: Nmax>1.6.

[0033] According to another aspect of the present invention, a waveguide display system is provided, comprising: an optical machine, the optical machine comprising the above-mentioned projection lens group, the optical machine is used to emit RGB three-color light; an optical waveguide lens, the optical waveguide lens has a coupling-in working area, the RGB three-color light emitted by the optical machine enters the optical waveguide lens through the coupling-in working area, and enters the human eye for imaging after diffraction or reflection transmission.

[0034] By applying the technical solution of the present invention, the projection lens group includes, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, wherein the first lens has positive focal power, the second lens has positive focal power, the third lens has negative focal power, the fourth lens has negative focal power, and the fifth lens has positive focal power; wherein the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length f3 of the third lens, the focal length f4 of the fourth lens, and the focal length f5 of the fifth lens satisfy the following relationship: 0<1 / f1+1 / f2+1 / f3+1 / f4+1 / f5<0.1.

[0035] By setting the optical focal length of the first lens and the second lens to be positive, the negative optical focal length of the third lens can be balanced, thereby reducing the sensitivity of the system. The third lens has a negative optical focal length, and such a setting can effectively correct aberrations and improve the optical performance of the system, such as spherical aberration, coma, etc. The projection lens assembly of the present invention reasonably matches the optical focal length of each lens while constraining the relationship between the focal lengths of each lens, so that the projection lens assembly of the present application has the advantages of high resolution, small size, high light efficiency and mass production. At the same time, by constraining the relationship between the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length f3 of the third lens, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens, it is also helpful to control the sum of the refractive power strengths of each lens, which can effectively balance the optical focal length distribution and alleviate the impact of temperature changes on the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0037] Figure 1 The optical path diagram of the projection lens assembly according to the first embodiment of the present invention is shown;

[0038] Figures 2 to 4 They are shown respectively Figure 1 Astigmatism curve, distortion curve and relative illumination curve of the projection lens group in;

[0039] Figure 5 The optical path diagram of the projection lens assembly of the second embodiment of the present invention is shown;

[0040] Figures 6 to 8 They are shown respectively Figure 5Astigmatism curve, distortion curve and relative illumination curve of the projection lens group in;

[0041] Fig. 9 The optical path diagram of the projection lens assembly of the third embodiment of the present invention is shown;

[0042] Figures 10 to 12 They are shown respectively Fig. 9 Astigmatism curve, distortion curve and relative illumination curve of the projection lens group in;

[0043] Fig.13 The optical path diagram of the projection lens assembly of the fourth embodiment of the present invention is shown;

[0044] Figures 14 to 16 They are shown respectively Fig.13 Astigmatism curve, distortion curve and relative illumination curve of the projection lens group in;

[0045] Fig.17 The optical path diagram of the projection lens assembly of the fifth embodiment of the present invention is shown;

[0046] Figures 18 to 20 They are shown respectively Fig.17 Astigmatism curve, distortion curve and relative illumination curve of the projection lens group in;

[0047] Fig.21 shows an optical path diagram of a projection lens assembly according to a sixth embodiment of the present invention;

[0048] Figure 22 to Figure 24 They are shown respectively Fig.21 Astigmatism curve, distortion curve and relative illumination curve of the projection lens group in;

[0049] Fig.25 A schematic diagram showing the structure of an AR device according to an optional embodiment of the present invention is shown;

[0050] Fig.26 A schematic diagram showing a waveguide color combination display system according to an optional embodiment of the present invention;

[0051] Fig. 27 A schematic diagram showing the arrangement of three spatially separated coupling-in regions according to an alternative embodiment of the present invention is shown.

[0052] The above drawings include the following reference numerals:

[0053] STO, aperture; E1, first lens; S2, object side surface of the first lens; S3, image side surface of the first lens; E2, second lens; S4, object side surface of the second lens; S5, image side surface of the second lens; E3, third lens; S6, object side surface of the third lens; S7, image side surface of the third lens; E4, fourth lens; S8, object side surface of the fourth lens; S9, image side surface of the fourth lens; E5, fifth lens; S10, object side surface of the fifth lens; S11, image side surface of the fifth lens; S12, imaging surface; 1, left-eye display system; 2, right-eye display system; 3, space sensor; 4, computing unit; 5, position sensor; 6, frame; 7, red light engine; 8, green light engine; 9, blue light engine; 10, red light coupling-in region; 11, green light coupling-in region; 12, blue light coupling-in region; 13, coupling-out region; 14, optical waveguide lens; 15, human eye. DETAILED DESCRIPTION

[0054] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0055] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0056] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0057] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0058] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0059] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface shape in the paraxial area can be based on the judgment method of the general knowledgeable people in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the radius of curvature value on the lens database (lens data) in the optical software) is used to judge the convexity and concavity. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0060] In order to solve the problem in the prior art that it is difficult to achieve high resolution, small size and high light efficiency at the same time in a projection lens assembly, the present invention provides a projection lens assembly and a waveguide display system.

[0061] like Figures 1 to 24 As shown, the projection lens group includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens from the object side to the image side, the first lens has positive focal power; the second lens has positive focal power; the third lens has negative focal power; the fourth lens has negative focal power; and the fifth lens has positive focal power; wherein the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length f3 of the third lens, the focal length f4 of the fourth lens, and the focal length f5 of the fifth lens satisfy: 0<1 / f1+1 / f2+1 / f3+1 / f4+1 / f5<0.1.

[0062] By setting the optical focal length of the first lens and the second lens to be positive, the negative optical focal length of the third lens can be balanced, thereby reducing the sensitivity of the system. The third lens has a negative optical focal length, and such a setting can effectively correct aberrations and improve the optical performance of the system, such as spherical aberration, coma, etc. The projection lens assembly of the present invention reasonably matches the optical focal length of each lens while constraining the relationship between the focal lengths of each lens, so that the projection lens assembly of the present application has the advantages of high resolution, small size, high light efficiency and mass production. At the same time, by constraining the relationship between the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length f3 of the third lens, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens, it is also helpful to control the sum of the refractive power strengths of each lens, which can effectively balance the optical focal length distribution and alleviate the impact of temperature changes on the system.

[0063] In this embodiment, the projection lens group further includes an aperture, which is arranged on the object side of the first lens. The present application is conducive to effectively converging the light entering the optical system by arranging the aperture before the first lens. The projection lens group further includes a display chip, which is located on the image side of the fifth lens.

[0064] It should be noted that the above display chip is a Micro LED display chip, and the projection lens group of the present application is actually a projection lens group that matches the RGB three-color single Micro LED display chip. The object side mentioned above is the side facing the light waveguide lens, and the image side is the side facing the display chip.

[0065] In this embodiment, the object side surface of the first lens is convex, and the image side surface is concave. The convex object side surface of the first lens can maintain an appropriate projection angle. The object side surface of the second lens is convex, and the image side surface is concave. The object side surface of the third lens is convex, and the image side surface is concave. The object side surface near the optical axis of the fourth lens is convex, and the image side surface is concave. The object side surface near the optical axis of the fifth lens is convex, and the image side surface is concave. Moreover, both side surfaces of the first lens to the fifth lens are aspherical surfaces. By setting the aspherical surfaces, it is beneficial to correct field curvature, compress distortion, and achieve high resolution. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. At least one inflection point is included at the off-axis position of both side surfaces of the fourth lens and the image side surface of the fifth lens. By setting the inflection, it is beneficial to balance aberration and improve resolution. At the same time, the fourth lens has a negative optical power, and the fifth lens has a positive optical power with the inflection characteristic, which can help reduce the chief ray angle on the image plane of the system, make the light on the chip surface inside the lens system appear telecentric, so as to improve the overall illuminance of the system and reduce aberrations such as field curvature and distortion.

[0066] It should be noted here that since both the fourth lens and the fifth lens are provided with inflections, in the following text, if there is a description of the surface shape of the fourth lens and the fifth lens, it refers to the shape of the corresponding surface near the optical axis; for example: the object side surface of the fourth lens is convex, and the image side surface is concave; specifically, it means that the object side surface near the optical axis of the fourth lens is convex, and the image side surface near the optical axis is concave; the object side surface of the fifth lens is convex, and the image side surface is concave, specifically referring to the object side surface near the optical axis of the fifth lens is convex, and the image side surface near the optical axis is concave.

[0067] In this embodiment, the focal length f of the projection lens group, the focal length f1 of the first lens, and the focal length f2 of the second lens satisfy: 1.6 < f / f1 + f / f2 < 2. The focal length f of the projection lens group and the focal length f3 of the third lens satisfy: 0.5 < |f3 / f| < 0.7. By controlling these two relationships, it is beneficial to the reasonable distribution of the focal length value of the first lens and the focal length of the third lens in the system, helps the total refractive power intensity of each lens, can effectively balance the optical power distribution, and alleviate the influence of the system caused by temperature changes.

[0068] In this embodiment, the following relationships are satisfied between the radius of curvature R11 of the object side surface of the first lens and the radius of curvature R12 of the image side surface of the first lens: 3 < R12 / R11 < 5. The following relationship is satisfied between the radius of curvature R21 of the object side surface of the second lens and the radius of curvature R22 of the image side surface of the second lens: 2 < R22 / R21 < 4. The following relationship is satisfied between the radius of curvature R31 of the object side surface of the third lens and the radius of curvature R32 of the image side surface of the third lens: 2.5 < R31 / R32 < 3. The following relationship is satisfied between the radius of curvature R11 of the object side surface of the first lens and the radius of curvature R21 of the object side surface of the second lens: 0.9 < R11 / R21 < 1.5. The following relationship is satisfied between the radius of curvature R11 of the object side surface of the first lens and the radius of curvature R31 of the object side surface of the third lens: 0.9 < R11 / R31 < 1.6. The following relationship is satisfied between the radius of curvature R51 of the object side surface of the fifth lens and the radius of curvature R11 of the object side surface of the first lens: 0.7 < R51 / R11 < 1.3. By controlling the above relationships, the sensitivity to temperature and tolerances in the system can be effectively reduced. Other aberrations such as spherical aberration and coma except chromatic aberration can be better balanced, and at the same time, the CRA angle of the large field of view light rays on the image plane can be better reduced, the light energy utilization rate of the projection lens group for the display chip can be improved, and the assembly qualification rate of the projection lens group can be enhanced.

[0069] In this embodiment, the distance T from the object side surface of the first lens to the display chip on the optical axis satisfies: 5.5 mm < T < 7 mm. The following relationship is satisfied between the air gap AT3 from the image side surface of the third lens to the object side surface of the fourth lens and the distance T from the object side surface of the first lens to the display chip on the optical axis: 0.21 < AT3 / T < 0.3. By constraining the above conditional expressions, it is beneficial to achieve a small size of the projection lens group. Under the premise of meeting the feasibility of the processing and assembly of the projection lens group, the total length and the radial optical effective size of the lens system can be controlled to maintain miniaturization and reduce the volume of the projection lens group.

[0070] In this embodiment, half of the maximum field of view angle HFOV of the projection lens group satisfies: 0° < HFOV < 20°. The aperture value Fno of the projection lens group satisfies: 1.3 < Fno < 2.5. The entrance pupil diameter EPD of the projection lens group satisfies: 1 mm < EPD < 5 mm.

[0071] In this embodiment, at least one of the first lens to the fifth lens is a glass lens. Preferably, the first lens can be a glass lens, while the second lens, the third lens, the fourth lens, and the fifth lens are all made of plastic. Optionally, the second lens can be a glass lens, while the first lens, the third lens, the fourth lens, and the fifth lens are all made of plastic. Or, both the first lens and the second lens are glass lenses, while the third lens, the fourth lens, and the fifth lens are all made of plastic.

[0072] In this embodiment, the Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: V1+V2>100. The minimum value Vmin of the Abbe number among the first lens to the fifth lens satisfies: Vmin<25. The maximum value Vmax of the Abbe number among the first lens to the fifth lens satisfies: Vmax>40. The maximum value Nmax of the refractive index among the first lens to the fifth lens satisfies: Nmax>1.6. By reasonably constraining the maximum value of the Abbe number and the refractive index of each lens, the distribution of different lens materials in the system can be adjusted to facilitate maintaining the stability of the image quality of the lens system under different temperature changes, correcting aberrations such as chromatic aberration, and facilitating the projection lens group to be compatible with three monochrome display chips of RGB to maintain good image quality.

[0073] Optionally, the projection lens assembly may or may not include a protective glass for protecting the display chip. Preferably, the projection lens assembly does not include a protective glass. This is beneficial to further reduce the total length of the projection lens assembly and facilitate miniaturization.

[0074] In some embodiments, the display wavelength of the display chip can be red light in the 600nm to 650nm band, or green light in the 500nm to 570nm band, or blue light in the 420nm to 480nm band. This configuration enables the projection lens assembly of the present application to have better resolution and higher light transmission efficiency for display chips of different colors. In most cases, due to the existence of chromatic aberration of the projection lens assembly, there will be slight differences in the best optical back focus of the three types of display chips, and there will also be slight differences in various optical properties (such as focal length, distortion curve, astigmatism curve, etc.).

[0075] In some embodiments, the sizes of the RGB three-color Micro LED display chips are equal, both 1.26 inches.

[0076] like Figure 25 to Figure 27 As shown, the present application also provides a waveguide display system, including an optical machine and an optical waveguide lens, the optical machine includes the above-mentioned projection lens group, the optical machine is used to emit RGB three-color light; the optical waveguide lens has a coupling-in working area, the RGB three-color light emitted by the optical machine enters the optical waveguide lens through the coupling-in working area, and enters the human eye for imaging after diffraction or reflection transmission.

[0077] like Figure 25 to Figure 27 As shown, the present application also provides an AR device, specifically AR glasses, but is not limited to this.

[0078] refer to Fig.25, the AR device includes the above-mentioned waveguide display system, which is respectively a left-eye display system 1 and a right-eye display system 2, and also includes a camera, a spatial sensor 3, a computing unit 4, a position sensor 5, and a frame 6. Among them, the Micro LED display chip in the optical machine of the waveguide display system displays the image, which is input into the coupling working area of ​​the optical waveguide lens after passing through each lens of the projection lens group, and enters the human eye through a series of light transmission. The optical waveguide lens has a high transmittance, allowing users to clearly observe the real world. The computing unit 4 configured in the figure can not only provide image signals for the display chip, but also communicate with the camera, spatial sensor 3, and position sensor 5 in the system. The camera and spatial sensor 3 can be a combination of an RGB camera, a monochrome camera, an eye tracking sensor, and a depth camera. The RGB or monochrome camera can obtain the environmental picture in the real scene, the eye tracking sensor can realize the eye tracking function, and the depth camera can obtain the depth information of the scene to realize the functions of face and gesture recognition. The position sensor 5 can be a combination of an accelerometer, a gyroscope, a magnetometer, and a global positioning system receiver. After the computing unit 4 processes the signal from the position sensor, the virtual picture can be more accurately superimposed on the real environment.

[0079] like Fig.26 As shown, the present application also provides a waveguide color display system, including: a red light engine 7, a green light engine 8, a blue light engine 9 and a light waveguide lens 14, the light waveguide lens 14 includes three spatially separated coupling areas, namely a red light coupling area 10, a green light coupling area 11 and a blue light coupling area 12, each matching an RGB three-color light engine. The display images of the three RGB monochrome display chips are projected by the projection lens group in each light engine, respectively input into the three coupling areas, and coupled into the light waveguide lens 14, and then the three color lights are transmitted to the same coupling area 13 through total reflection pupil expansion to couple out the image light, and finally the full-color image is received by the user's human eye 15.

[0080] The optical waveguide lens 14 may be a single layer or may be formed by stacking multiple layers of optical waveguide lenses 14. The three spatially separated coupling regions may be simultaneously configured on a single layer of optical waveguide lens 14 or respectively configured on different layers of optical waveguide lenses 14. The spatial arrangement of the three coupling regions (vertical to the viewing direction of the surface of the optical waveguide lens 14) may be as follows: Fig. 27 A triangular arrangement a, b, or a linear arrangement c, d, or other arrangements are possible.

[0081] The following further describes the specific surface type and parameter examples of the projection lens assembly applicable to the above-mentioned embodiments with reference to the accompanying drawings. In the following embodiments, the green light Micro LED display chip in the wavelength band of 500nm to 570nm is used as the light source of the projection lens assembly to demonstrate the performance.

[0082] It should be noted that any one of the following embodiments 1 to 6 is applicable to all embodiments of the present application.

[0083] Embodiment 1

[0084] like Figures 1 to 4 As shown, the projection lens assembly of the first embodiment of the present application is described. Figure 1 The optical path diagram of the projection lens assembly of the first embodiment is shown.

[0085] like Figure 1 As shown, the projection lens assembly includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and an imaging surface S12.

[0086] The first lens E1 has positive focal power, the object side surface S2 of the first lens is convex, and the image side surface S3 of the first lens is concave. The second lens E2 has positive focal power, the object side surface S4 of the second lens is convex, and the image side surface S5 of the second lens is concave. The third lens E3 has negative focal power, the object side surface S6 of the third lens is convex, and the image side surface S7 of the third lens is concave. The fourth lens E4 has negative focal power, the object side surface S8 of the fourth lens is convex, and the image side surface S9 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S10 of the fifth lens is convex, and the image side surface S11 of the fifth lens is concave.

[0087] In this embodiment, the focal length f of the projection lens assembly is 5.91 mm, the entrance pupil diameter EPD of the projection lens assembly is 3.9 mm, the aperture value Fno of the projection lens assembly is 1.51, and half of the maximum field of view HFOV of the projection lens assembly is 15°.

[0088] In this embodiment, the specific numerical values ​​of the above conditional formula are as follows: 1 / f1+1 / f2+1 / f3+1 / f4+1 / f5=0.043; f / f1+f / f2=1.817; |f3 / f|=0.599; R12 / R11=4.834; R22 / R21=3.103; R31 / R32=2.337; R11 / R21=1.085; R11 / R31=1.079; R51 / R11=1.079; T=6.1mm; AT3 / T=0.259; V1+V2=109; Vmin=20.4; Vmax=56; Nmax=1.69.

[0089] Table 1 shows a basic structural parameter table of the projection lens assembly of Example 1, wherein the units of the curvature radius, thickness, and focal length are all millimeters (mm).

[0090]

[0091]

[0092] Table 1

[0093] In Embodiment 1, the object side surface and the image side surface of any lens among the first lens E1 to the fifth lens E5 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0094]

[0095] Where X is the relative distance between the point on the aspheric surface and the intersection point on the optical axis of the aspheric surface, which is Y away from the optical axis; Y is the vertical distance between the point on the aspheric curve and the optical axis; R is the radius of curvature; k is the cone coefficient; Ai is the i-th order aspheric coefficient;

[0096] Table 2 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, and A18 that can be used for the aspheric mirror surfaces S1-S14 in Example 1.

[0097] Coefficient / Surface 2 3 4 5 6 K 6.88230E-02 3.58483E+01 3.20862E-01 5.84893E+00 -8.18504E+00 A4 -4.62979E-03 1.28672E-02 2.38525E-02 -1.01599E-01 -1.63365E-01 A6 3.83056E-03 1.81973E-03 -3.25361E-03 1.85132E-01 2.68198E-01 A8 -2.95735E-03 -7.06903E-03 -6.69764E-04 -1.88164E-01 -2.65541E-01 A10 1.48173E-03 4.26071E-03 -6.62602E-04 1.18591E-01 1.75623E-01 A12 -4.70841E-04 -1.32368E-03 7.17939E-04 -4.64052E-02 -7.59981E-02 A14 8.21846E-05 2.20726E-04 -2.05678E-04 1.02342E-02 1.91859E-02 A16 -5.96922E-06 -1.56599E-05 1.98412E-05 -9.62316E-04 -2.10092E-03 A18 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 Coefficient / Surface 7 8 9 10 11 K -2.07928E+00 1.32635E+01 -7.83391E+00 -4.34206E+00 5.00000E+01 A4 -4.25354E-02 -9.64661E-02 -2.03989E-02 -4.78053E-02 -6.02684E-02 A6 1.72735E-01 4.06204E-03 -2.53356E-02 2.05518E-03 -3.32518E-02 A8 -1.96019E-01 -3.54285E-02 2.77351E-02 3.89560E-02 6.35936E-02 A10 2.08333E-01 6.25118E-02 -3.15857E-02 -5.65389E-02 -6.11851E-02 A12 -1.60192E-01 -8.07502E-02 1.68447E-02 3.40116E-02 3.27977E-02 A14 7.12336E-02 4.88531E-02 -4.29325E-03 -9.43848E-03 -8.62431E-03 A16 -1.26348E-02 -1.22557E-02 4.22526E-04 9.92583E-04 8.66189E-04 A18 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00

[0098] Table 2

[0099] Figure 2 The astigmatism curve of the projection lens assembly of Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 3 The distortion curve of the projection lens assembly of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Figure 4 The relative illumination curve of the projection lens assembly of the first embodiment is shown, which represents the ratio of the peripheral brightness to the central brightness.

[0100] according to Figures 2 to 4 It can be seen that the projection lens assembly provided in the first embodiment can achieve good imaging quality.

[0101] Embodiment 2

[0102] like Figures 5 to 8 As shown, the projection lens assembly of the second embodiment of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to the first embodiment will be omitted. Figure 5 The optical path diagram of the projection lens assembly of the second embodiment is shown.

[0103] like Figure 5 As shown, the projection lens assembly includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and an imaging surface S12.

[0104] The first lens E1 has positive focal power, the object side surface S2 of the first lens is convex, and the image side surface S3 of the first lens is concave. The second lens E2 has positive focal power, the object side surface S4 of the second lens is convex, and the image side surface S5 of the second lens is concave. The third lens E3 has negative focal power, the object side surface S6 of the third lens is convex, and the image side surface S7 of the third lens is concave. The fourth lens E4 has negative focal power, the object side surface S8 of the fourth lens is convex, and the image side surface S9 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S10 of the fifth lens is convex, and the image side surface S11 of the fifth lens is concave.

[0105] In this embodiment, the focal length f of the projection lens assembly is 5.92 mm, the entrance pupil diameter EPD of the projection lens assembly is 3.6 mm, the aperture value Fno of the projection lens assembly is 1.64, and half of the maximum field of view HFOV of the projection lens assembly is 15°.

[0106] In this embodiment, the specific numerical values ​​of the above conditional formula are as follows: 1 / f1+1 / f2+1 / f3+1 / f4+1 / f5=0.046; f / f1+f / f2=1.866; |f3 / f|=0.630; R12 / R11=4.442; R22 / R21=3.360; R31 / R32=2.252; R11 / R21=1.110; R11 / R31=1.098; R51 / R11=0.889; T=6.1mm; AT3 / T=0.281; V1+V2=109; Vmin=20.4; Vmax=56; Nmax=1.69.

[0107] Table 3 shows the basic structural parameters of the projection lens assembly of the second embodiment, wherein the units of the radius of curvature, thickness and focal length are all millimeters (mm).

[0108]

[0109] Table 3

[0110] Table 4 shows the high-order coefficients of each aspherical mirror surface that can be used in the second embodiment, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the first embodiment above.

[0111] Coefficient / Surface 2 3 4 5 6 K 1.79017E-01 3.77140E+01 2.84711E-01 7.87273E+00 -7.93958E+00 A4 -3.48549E-03 2.44419E-02 3.72832E-02 -9.87637E-02 -1.71130E-01 A6 4.16147E-03 -1.54613E-02 -2.87095E-02 1.75991E-01 2.97019E-01 A8 -3.84294E-03 6.41665E-03 2.13043E-02 -1.68519E-01 -2.99362E-01 A10 2.12210E-03 -1.94200E-03 -1.18177E-02 9.65134E-02 1.91399E-01 A12 -6.98979E-04 3.94178E-04 4.08748E-03 -3.31216E-02 -7.59006E-02 A14 1.26159E-04 -4.01980E-05 -7.51637E-04 6.23433E-03 1.68701E-02 A16 -9.55536E-06 6.61775E-07 5.45502E-05 -4.93688E-04 -1.59725E-03 A18 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 Coefficient / Surface 7 8 9 10 11 K -2.16705E+00 1.34590E+01 -7.70527E+00 -6.13255E+00 7.47304E+00 A4 -5.67655E-02 -9.78271E-02 -6.36953E-02 -1.34202E-01 -1.49599E-01 A6 2.24264E-01 1.37473E-02 1.32019E-01 1.95252E-01 1.18066E-01 A8 -2.93912E-01 -3.00520E-02 -1.78318E-01 -1.58693E-01 -5.93112E-02 A10 2.91001E-01 4.08926E-03 1.21850E-01 6.38347E-02 -5.26968E-03 A12 -1.90826E-01 9.53906E-03 -5.07200E-02 -1.09527E-02 1.84191E-02 A14 7.28592E-02 -8.04591E-03 1.16298E-02 -1.15699E-04 -6.72677E-03 A16 -1.19739E-02 1.06076E-03 -1.09808E-03 1.85781E-04 7.71597E-04 A18 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00

[0112] Table 4

[0113] Figure 6 The astigmatism curve of the projection lens assembly of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 7 The distortion curve of the projection lens assembly of the second embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Figure 8The relative illumination curve of the projection lens assembly of the second embodiment is shown, which represents the ratio of the peripheral brightness to the central brightness.

[0114] according to Figures 6 to 8 It can be seen that the projection lens assembly provided in the second embodiment can achieve good imaging quality.

[0115] Embodiment 3

[0116] like Figures 9 to 12 As shown, the projection lens assembly of the third embodiment of the present application is described. Fig. 9 The optical path diagram of the projection lens assembly of the third embodiment is shown.

[0117] like Fig. 9 As shown, the projection lens assembly includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and an imaging surface S12.

[0118] The first lens E1 has positive focal power, the object side surface S2 of the first lens is convex, and the image side surface S3 of the first lens is concave. The second lens E2 has positive focal power, the object side surface S4 of the second lens is convex, and the image side surface S5 of the second lens is concave. The third lens E3 has negative focal power, the object side surface S6 of the third lens is convex, and the image side surface S7 of the third lens is concave. The fourth lens E4 has negative focal power, the object side surface S8 of the fourth lens is convex, and the image side surface S9 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S10 of the fifth lens is convex, and the image side surface S11 of the fifth lens is concave.

[0119] In this embodiment, the focal length f of the projection lens assembly is 5.59 mm, the entrance pupil diameter EPD of the projection lens assembly is 3.6 mm, the aperture value Fno of the projection lens assembly is 1.55, and half of the maximum field of view HFOV of the projection lens assembly is 16°.

[0120] In this embodiment, the specific numerical values ​​of the above conditional formula are as follows: 1 / f1+1 / f2+1 / f3+1 / f4+1 / f5=0.084; f / f1+f / f2=1.735; |f3 / f|=0.622; R12 / R11=4.342; R22 / R21=3.444; R31 / R32=2.350; R11 / R21=1.156; R11 / R31=1.150; R51 / R11=0.824; T=6.1mm; AT3 / T=0.232; V1+V2=109; Vmin=20.4; Vmax=56; Nmax=1.69.

[0121] Table 5 shows a basic structural parameter table of the projection lens assembly of Example 3, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0122]

[0123] Table 5

[0124] Table 6 shows the high-order coefficients of each aspherical mirror surface that can be used in the third embodiment, wherein each aspherical surface shape can be defined by the formula (1) given in the first embodiment above.

[0125]

[0126]

[0127] Table 6

[0128] Fig.10 The astigmatism curve of the projection lens assembly of Example 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Fig.11 The distortion curve of the projection lens assembly of the third embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Fig.12 The relative illumination curve of the projection lens assembly of the third embodiment is shown, which represents the ratio of the peripheral brightness to the central brightness.

[0129] according to Figures 10 to 12 It can be seen that the projection lens assembly provided in the third embodiment can achieve good imaging quality.

[0130] Embodiment 4

[0131] like Figures 13 to 16 As shown, the projection lens assembly of the fourth embodiment of the present application is described. Fig.13 The optical path diagram of the projection lens assembly of the fourth embodiment is shown.

[0132] like Fig.13 As shown, the projection lens assembly includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and an imaging surface S12.

[0133] The first lens E1 has positive focal power, the object side surface S2 of the first lens is convex, and the image side surface S3 of the first lens is concave. The second lens E2 has positive focal power, the object side surface S4 of the second lens is convex, and the image side surface S5 of the second lens is concave. The third lens E3 has negative focal power, the object side surface S6 of the third lens is convex, and the image side surface S7 of the third lens is concave. The fourth lens E4 has negative focal power, the object side surface S8 of the fourth lens is convex, and the image side surface S9 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S10 of the fifth lens is convex, and the image side surface S11 of the fifth lens is concave.

[0134] In this embodiment, the focal length f of the projection lens assembly is 5.93 mm, the entrance pupil diameter EPD of the projection lens assembly is 4.2 mm, the aperture value Fno of the projection lens assembly is 1.41, and half of the maximum field of view HFOV of the projection lens assembly is 15°.

[0135] In this embodiment, the specific numerical values ​​of the above conditional formula are as follows: 1 / f1+1 / f2+1 / f3+1 / f4+1 / f5=0.058; f / f1+f / f2=1.816; |f3 / f|=0.623; R12 / R11=4.449; R22 / R21=3.086; R31 / R32=2.270; R11 / R21=1.135; R11 / R31=1.126; R51 / R11=1.024; T=6.2mm; AT3 / T=0.260; V1+V2=109; Vmin=20.4; Vmax=56; Nmax=1.69.

[0136] Table 7 shows a basic structural parameter table of the projection lens assembly of Example 4, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0137]

[0138]

[0139] Table 7

[0140] Table 8 shows the high-order coefficients of each aspherical mirror surface that can be used in the fourth embodiment, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the first embodiment above.

[0141] Coefficient / Surface 2 3 4 5 6 K 5.20204E-02 3.76188E+01 6.82526E-01 7.40378E+00 -9.23882E+00 A4 -4.40448E-03 1.96403E-02 3.33236E-02 -4.82661E-02 -1.15209E-01 A6 4.27412E-03 -1.47964E-02 -2.75415E-02 5.73322E-02 1.35287E-01 A8 -3.34237E-03 7.08374E-03 1.71576E-02 -3.95402E-02 -8.84259E-02 A10 1.59310E-03 -2.06357E-03 -7.25101E-03 1.98369E-02 4.10274E-02 A12 -4.40364E-04 3.15710E-04 1.96914E-03 -7.01851E-03 -1.46387E-02 A14 6.46654E-05 -1.74953E-05 -3.08781E-04 1.43890E-03 3.40092E-03 A16 -3.88172E-06 -4.26960E-07 2.09394E-05 -1.22627E-04 -3.49288E-04 A18 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 Coefficient / Surface 7 8 9 10 11 K -1.84942E+00 -9.90000E+01 -7.37855E+00 -1.40820E+01 5.00000E+01 A4 -6.36579E-02 1.57249E-02 -3.48255E-02 -2.85571E-02 -6.08353E-02 A6 1.46739E-01 -1.78355E-01 -4.60497E-03 7.94220E-03 -2.36258E-02 A8 -1.17549E-01 2.92282E-01 2.51469E-03 -1.57103E-03 2.50951E-02 A10 9.12744E-02 -3.56343E-01 -5.83384E-03 1.63880E-04 -1.49168E-02 A12 -5.66872E-02 2.53309E-01 1.12540E-03 -2.17548E-06 8.75853E-03 A14 2.05510E-02 -9.78396E-02 3.78937E-04 8.43148E-07 -2.77699E-03 A16 -2.74506E-03 1.47912E-02 -9.46506E-05 -1.93798E-07 3.18252E-04 A18 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00

[0142] Table 8

[0143] Fig.14 The astigmatism curve of the projection lens assembly of Example 4 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.15 The distortion curve of the projection lens assembly of the fourth embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Fig.16 The relative illumination curve of the projection lens assembly of the fourth embodiment is shown, which represents the ratio of the peripheral brightness to the central brightness.

[0144] according to Figures 14 to 16 It can be seen that the projection lens assembly provided in the fourth embodiment can achieve good imaging quality.

[0145] Embodiment 5

[0146] like Figures 17 to 20 As shown, the projection lens assembly of the fifth embodiment of the present application is described. Fig.17The optical path diagram of the projection lens assembly of the fifth embodiment is shown.

[0147] like Fig.17 As shown, the projection lens assembly includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and an imaging surface S12.

[0148] The first lens E1 has positive focal power, the object side surface S2 of the first lens is convex, and the image side surface S3 of the first lens is concave. The second lens E2 has positive focal power, the object side surface S4 of the second lens is convex, and the image side surface S5 of the second lens is concave. The third lens E3 has negative focal power, the object side surface S6 of the third lens is convex, and the image side surface S7 of the third lens is concave. The fourth lens E4 has negative focal power, the object side surface S8 of the fourth lens is convex, and the image side surface S9 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S10 of the fifth lens is convex, and the image side surface S11 of the fifth lens is concave.

[0149] In this embodiment, the focal length f of the projection lens assembly is 5.90 mm, the entrance pupil diameter EPD of the projection lens assembly is 3.9 mm, the aperture value Fno of the projection lens assembly is 1.51, and half of the maximum field of view HFOV of the projection lens assembly is 15°.

[0150] In this embodiment, the specific numerical values ​​of the above conditional formula are as follows: 1 / f1+1 / f2+1 / f3+1 / f4+1 / f5=0.038; f / f1+f / f2=1.866; |f3 / f|=0.605; R12 / R11=3.440; R22 / R21=3.213; R31 / R32=2.382; R11 / R21=1.220; R11 / R31=1.028; R51 / R11=1.135; T=6.1mm; AT3 / T=0.258; V1+V2=109; Vmin=20.4; Vmax=56; Nmax=1.69.

[0151] Table 9 shows a basic structural parameter table of the projection lens assembly of Example 5, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0152]

[0153] Table 9

[0154] Table 10 shows the high-order coefficients of each aspherical mirror surface that can be used in the fifth embodiment, wherein each aspherical surface shape can be defined by the formula (1) given in the first embodiment above.

[0155]

[0156]

[0157] Table 10

[0158] Fig.18 The astigmatism curve of the projection lens assembly of Example 5 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.19 The distortion curve of the projection lens assembly of the fifth embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Fig. 20 The relative illumination curve of the projection lens assembly of the fifth embodiment is shown, which represents the ratio of the peripheral brightness to the central brightness.

[0159] according to Figures 18 to 20 It can be seen that the projection lens assembly provided in the fifth embodiment can achieve good imaging quality.

[0160] Embodiment 6

[0161] like Figure 21 to Figure 24 As shown, the projection lens assembly of embodiment 6 of the present application is described. Fig.21 The optical path diagram of the projection lens assembly of the sixth embodiment is shown.

[0162] like Fig.21 As shown, the projection lens assembly includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and an imaging surface S12.

[0163] The first lens E1 has positive focal power, the object side surface S2 of the first lens is convex, and the image side surface S3 of the first lens is concave. The second lens E2 has positive focal power, the object side surface S4 of the second lens is convex, and the image side surface S5 of the second lens is concave. The third lens E3 has negative focal power, the object side surface S6 of the third lens is convex, and the image side surface S7 of the third lens is concave. The fourth lens E4 has negative focal power, the object side surface S8 of the fourth lens is convex, and the image side surface S9 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S10 of the fifth lens is convex, and the image side surface S11 of the fifth lens is concave.

[0164] In this embodiment, the focal length f of the projection lens assembly is 5.90 mm, the entrance pupil diameter EPD of the projection lens assembly is 3.9 mm, the aperture value Fno of the projection lens assembly is 1.51, and half of the maximum field of view HFOV of the projection lens assembly is 15°.

[0165] In this embodiment, the specific numerical values ​​of the above conditional formula are as follows: 1 / f1+1 / f2+1 / f3+1 / f4+1 / f5=0.062; f / f1+f / f2=1.771; |f3 / f|=0.609; R12 / R11=3.784; R22 / R21=2.762; R31 / R32=2.010; R11 / R21=1.282; R11 / R31=1.443; R51 / R11=0.987; T=6.1mm; AT3 / T=0.260; V1+V2=115; Vmin=20.4; Vmax=59.11; Nmax=1.661.

[0166] Table 11 shows the basic structural parameters of the projection lens assembly of Example 6, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0167]

[0168] Table 11

[0169] Table 12 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 6, wherein each aspherical surface shape can be defined by formula (1) given in the above-mentioned Example 1.

[0170] Coefficient / Surface 2 3 4 5 6 K 2.47679E-01 3.13665E+01 1.81334E-01 1.29788E+01 -8.03268E+00 A4 -1.16085E-03 2.34151E-02 2.20758E-02 -9.39371E-02 -1.89326E-01 A6 4.14262E-03 1.16437E-03 -7.48388E-04 1.92628E-01 3.69897E-01 A8 -2.94920E-03 -1.71003E-02 -8.69049E-03 -2.13274E-01 -4.38053E-01 A10 8.99936E-04 1.13069E-02 3.98310E-03 1.40084E-01 3.35514E-01 A12 -1.43063E-04 -3.46664E-03 -3.61806E-04 -5.45122E-02 -1.60303E-01 A14 1.33705E-05 5.36972E-04 -9.91029E-05 1.14647E-02 4.28192E-02 A16 -7.03797E-07 -3.44738E-05 1.50263E-05 -1.00385E-03 -4.82935E-03 A18 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 Coefficient / Surface 7 8 9 10 11 K -2.12803E+00 5.70491E+00 -8.35631E+00 -1.62255E+00 -6.09985E+01 A4 -1.00685E-01 -1.37996E-01 -2.94380E-02 -9.73150E-02 -9.18128E-02 A6 3.63365E-01 4.57116E-02 -1.09470E-03 7.84923E-02 2.24304E-02 A8 -5.19244E-01 -1.05849E-01 -1.64145E-02 -5.15954E-02 1.45674E-03 A10 5.45949E-01 1.26530E-01 8.96763E-03 2.25605E-02 -1.30099E-02 A12 -3.68932E-01 -1.20972E-01 -4.53292E-03 -5.59351E-03 1.15377E-02 A14 1.38938E-01 6.38820E-02 1.45650E-03 7.10944E-04 -3.72354E-03 A16 -2.03316E-02 -1.53892E-02 -1.97925E-04 -3.88209E-05 4.06135E-04 A18 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00

[0171] Table 12

[0172] Fig. 22 The astigmatism curve of the projection lens assembly of Example 6 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.23 The distortion curve of the projection lens assembly of Example 6 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.24 The relative illumination curve of the projection lens assembly of the sixth embodiment is shown, which represents the ratio of the peripheral brightness to the central brightness.

[0173] according to Figure 22 to Figure 24 It can be seen that the projection lens assembly provided in the sixth embodiment can achieve good imaging quality.

[0174] Obviously, the embodiments described above are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0175] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0176] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0177] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A projection lens assembly, characterized in that: From the object side to the image side, they include: a first lens having positive optical power; a second lens having positive optical power; A third lens having negative optical power; a fourth lens having negative optical power; a fifth lens having positive refractive power; Among them, the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length f3 of the third lens, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: 0<1 / f1+1 / f2+1 / f3+1 / f4+1 / f5<0.

1.

2. The projection lens assembly according to claim 1, characterized in that: The object side surface of the first lens is convex, and the image side surface is concave.

3. The projection lens assembly according to claim 1, characterized in that: The object side surface of the second lens is convex, and the image side surface is concave.

4. The projection lens assembly according to claim 1, characterized in that: The object side surface of the third lens is convex, and the image side surface is concave.

5. The projection lens assembly according to claim 1, characterized in that: The object side surface of the fourth lens near the optical axis is convex, and the image side surface is concave.

6. The projection lens assembly according to claim 1, characterized in that: The object side surface of the fifth lens near the optical axis is convex, and the image side surface is concave.

7. The projection lens assembly according to claim 1, characterized in that: The projection lens assembly further includes an aperture stop, which is arranged on the object side of the first lens.

8. The projection lens assembly according to claim 1, characterized in that: The projection lens assembly further includes a display chip, and the display chip is located on the image side of the fifth lens.

9. The projection lens assembly according to any one of claims 1 to 8, characterized in that: The focal length f of the projection lens assembly, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 1.6 <f / f1+f / f2<2。 10. A waveguide display system, characterized in that: include: An optical machine, comprising the projection lens assembly according to any one of claims 1 to 9, and configured to emit RGB three-color light; The optical waveguide lens has a coupling-in working area, and the RGB three-color light emitted by the optical machine enters the optical waveguide lens through the coupling-in working area, and enters the human eye for imaging after diffraction or reflection transmission.

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