Optical machine module and near-to-eye display equipment

Abstract

The utility model discloses an optical machine module and a near-to-eye display device. A lighting assembly and a lighting and imaging multiplexing assembly of the optical machine module are located on the two sides of a waveguide sheet. Illuminating light emitted by the illuminating assembly is transmitted in the first direction, transmitted through the waveguide sheet, the fly-eye lens, the first polaroid and the lens set in sequence, then incident to the surface, close to one side of the lens set, of the light modulator and modulated into imaging light through the light modulator to be reflected, and the imaging light is transmitted through the lens set and the second polaroid in the second direction and then emitted to the other side of the light modulator. And after total reflection transmission in the waveguide sheet, the light is emitted from the exit pupil area of the waveguide sheet to the human eyes, and the included angles between the first direction and the normal of the light modulator and between the second direction and the normal of the light modulator are the same. According to the optical machine module provided by the utility model, the volume of the optical machine module can be reduced on the premise of ensuring the performance of the optical machine.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical technology field especially relates to a light machine module and near eye display device. BACKGROUND

[0002] In recent years, augmented reality (AR) technology develops rapidly, and a series of related products are successively published, this technology superimposes virtual image on the real world perceived by the user, can create a realistic experience, has great application prospect in multiple fields. In order to realize the function of augmented reality, researchers have proposed a variety of schemes, for example, coaxial air guide (Birdbath), prism, freeform surface and optical waveguide technology, among the first three schemes, there is often a contradiction between good product form and better display effect, and the optical waveguide can effectively solve the above problems, and the scheme of light machine plus optical waveguide is a lightweight miniaturization, the most important AR development scheme in the future.

[0003] In the optical waveguide technology scheme, an optical engine, i.e. light machine, is needed as an image generating unit. Generally speaking, optical waveguide can be thinned at present, and the form has approached the size and shape of nearsighted glasses lenses. The light machine can be less than 0.2cc in volume in the case of small field of view, except for the micro light emitting diode (micro LED) scheme, and the light machine of other schemes is more than 1cc, especially the light machine with a field of view (FOV) of more than 50 degrees, with the increase of the field of view, the volume is more than 1.5cc or even 2cc. Since the resolution and cost of micro LED are relatively inferior to liquid crystal on silicon (LCOS), LCOS light machine is still a very important AR light machine solution in the short term. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of light machine module and near eye display device, can reduce the volume of light machine module under the premise of guaranteeing light machine performance.

[0005] Firstly, the utility model embodiment provides a kind of light machine module, comprising: illumination component, illumination and imaging multiplexing component and waveguide sheet;The illumination component and the illumination and imaging multiplexing component are located at the two sides of the waveguide sheet;

[0006] The illumination and imaging multiplexing component includes compound eye lens, first polaroid, lens group and light modulator sequentially arranged along the direction that the illumination component points to the waveguide sheet, and second polaroid between the lens group and the entrance pupil area of the waveguide sheet;

[0007] The illumination light emitted by the illumination assembly is transmitted along a first direction, transmitted in sequence by the waveguide sheet, the fly-eye lens, the first polarizer and the lens group, and then incident on the surface of the light modulator close to the lens group, and the imaging light is modulated by the light modulator and reflected, the imaging light is transmitted by the lens group and the second polarizer along a second direction, and then incident on the entrance pupil area of the waveguide sheet, transmitted by total reflection in the waveguide sheet, and then emitted from the exit pupil area of the waveguide sheet to reach the human eye, and the included angle between the first direction and the second direction and the normal line of the light modulator is the same.

[0008] Optionally, the lens group comprises a first aspheric lens, a first spherical lens, a second aspheric lens and a third aspheric lens arranged in sequence along the common optical axis in the direction in which the illumination assembly points to the waveguide sheet.

[0009] The surface of the first aspheric lens close to the first polarizer is a convex surface, and the surface of the first aspheric lens away from the first polarizer is a concave surface; the focal length fg1 of the first aspheric lens satisfies: -40mm≤fg1≤-25mm.

[0010] The surface of the first spherical lens close to the first aspheric lens is a convex surface, and the surface of the first spherical lens away from the first aspheric lens is a convex surface; the focal length fg2 of the first spherical lens satisfies: 4mm≤fg2≤8mm.

[0011] The surface of the second aspheric lens close to the first spherical lens is a convex surface, and the surface of the second aspheric lens away from the first spherical lens is a concave surface; the focal length fg3 of the second aspheric lens satisfies: -55mm≤fg3≤-35mm.

[0012] The surface of the third aspheric lens close to the second aspheric lens is a convex surface, and the surface of the third aspheric lens away from the second aspheric lens is a convex surface; the focal length fg4 of the third aspheric lens satisfies: 3mm≤fg4≤9.5mm.

[0013] The light modulator comprises a liquid crystal on silicon chip, the size of the liquid crystal on silicon chip is 0.13-0.37 inches, and the field of view angle of the optical mechanical module is less than or equal to 40 degrees.

[0014] Optionally, a distance between a surface of the first aspheric lens away from the first polarizer and a surface of the first spherical lens close to the first aspheric lens is a first distance d1, a distance between a surface of the first spherical lens away from the first aspheric lens and a surface of the second aspheric lens close to the first spherical lens is a second distance d2, and a distance between a surface of the second aspheric lens away from the first spherical lens and a surface of the third aspheric lens close to the second aspheric lens is a third distance d3.

[0015] The first distance, the second distance, and the third distance satisfy: |d1-d2| / 2 < d2 < 3×(d1+d3).

[0016] Optionally, the first spherical lens and the second aspheric lens further comprise a preset number of glass spherical lenses.

[0017] A combined focal length fg31 of the glass spherical lens and the second aspheric lens satisfies: -55mm ≤ fg31 ≤ -35mm.

[0018] Optionally, the illumination assembly comprises a light-emitting diode light source and a light collecting device.

[0019] The light-emitting diode light source comprises a four-in-one light source emitting red, green, and blue light rays, and the light collecting device comprises a convex lens and a fourth aspheric lens arranged in sequence along an optical axis of the illumination assembly pointing to a direction of the waveguide sheet.

[0020] A surface of the convex lens away from the light-emitting diode light source is a convex surface, and a focal length f1 of the convex lens satisfies: 2mm ≤ f1 ≤ 4.5mm.

[0021] Both surfaces of the fourth aspheric lens are convex surfaces, and a focal length f2 of the fourth aspheric lens satisfies: 2mm ≤ f2 ≤ 4.5mm.

[0022] Optionally, the illumination assembly comprises a light-emitting diode light source and a light collecting device.

[0023] The light-emitting diode light source comprises a four-in-one light source emitting red, green, and blue light rays, and the light collecting device comprises a fifth aspheric lens arranged along a direction of the illumination assembly pointing to the waveguide sheet.

[0024] At least one surface of the fifth aspheric lens is a convex surface, and a focal length f3 of the fifth aspheric lens satisfies: 1mm ≤ f3 ≤ 5.5mm.

[0025] Optionally, the waveguide sheet comprises an array optical waveguide or a diffractive optical waveguide.

[0026] When the waveguide sheet is an array optical waveguide, the waveguide sheet has an embedded reflection surface at an entrance pupil region of the waveguide sheet.

[0027] The thickness of the waveguide sheet is 0.9mm-1.5mm.

[0028] Optionally, in the optical-mechanical module, the compound eye pupil and the waveguide entrance pupil are in a conjugate relationship.

[0029] The diameter df of the compound eye pupil satisfies 2mm≤df≤6mm, and the diameter de of the waveguide entrance pupil or the waveguide exit pupil satisfies 2mm≤de≤6mm.

[0030] The field of view angle FOVf of the compound eye pupil and the field of view angle FOVe of the waveguide entrance pupil or the waveguide exit pupil satisfy tan(FOVf) / tan(FOVe)=de / df.

[0031] Optionally, the optical-mechanical module further comprises a protective lens arranged on a side of the waveguide sheet close to the illumination assembly.

[0032] The protective lens comprises a transparent plastic or an electrochromic lens or a photochromic lens, and the transmittance of the transparent plastic is above 80%.

[0033] In a second aspect, the utility model embodiment further provides a near-eye display device, including the optical-mechanical module of any one of the first aspect.

[0034] The utility model embodiment discloses an optical-mechanical module and near-eye display device, and the optical-mechanical module comprises: illumination assembly, illumination and imaging multiplexing assembly and waveguide sheet, and the illumination assembly and illumination and imaging multiplexing assembly are located at both sides of the waveguide sheet, and the illumination and imaging multiplexing assembly comprises compound eye lens, first polarizer, lens group and light modulator arranged in sequence along the direction that the illumination assembly points to the waveguide sheet, and further comprises second polarizer located between the lens group and the entrance pupil region of the waveguide sheet, the illumination light of the illumination assembly transmits along the first direction, and after transmitting through the waveguide sheet, compound eye lens, first polarizer and lens group in proper order, the illumination light is incident to the surface of the side of the light modulator close to the lens group, is modulated as imaging light by the light modulator and is reflected, and after transmitting through the lens group and second polarizer along the second direction, the imaging light is incident to the entrance pupil region of the waveguide sheet, transmits in the waveguide sheet after total reflection and is emitted from the exit pupil region of the waveguide sheet to reach the human eye, and the angle between the first direction and the second direction and the normal line of the light modulator is same. The optical-mechanical module provided by the utility model can reduce the volume of the optical-mechanical module under the premise of guaranteeing the performance of the optical-mechanical module.

[0035] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the utility model, and is not used to limit the scope of the utility model. Other features of the utility model will become easy to understand through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0037] Figure 1 A structural schematic diagram of a light machine module of the prior art;

[0038] Figure 2 A structural schematic diagram of a light machine module provided by the embodiments of the present application;

[0039] Figure 3 A structural schematic diagram of another light machine module provided by the embodiments of the present application;

[0040] Figure 4 A structural schematic diagram of a lighting assembly provided by the embodiments of the present application;

[0041] Figure 5 A structural schematic diagram of another lighting assembly provided by the embodiments of the present application;

[0042] Figure 6 A light path diagram of a compound eye light pupil and a waveguide entrance pupil provided by the embodiments of the present application;

[0043] Figure 7 A curve diagram of definition and line pairs provided by the embodiments of the present application;

[0044] Figure 8 A distortion diagram provided by the embodiments of the present application. DETAILED DESCRIPTION

[0045] In order to make the person in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0046] It should be noted that the terms "first", "second", and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0047] Figure 1 A structure diagram of a light machine module of the prior art, the current common miniaturization LCOS illumination scheme is as shown in Figure 1 The LED emits Lambert light as a light source, which enters the imaging light path after collimation and uniform light of the illumination light path. The imaging light path includes a PBS polarization element, which will theoretically reduce the light efficiency by 50%, but polarization multiplexing can realize light path folding. At present, the illumination light path adopts the compound eye uniform light scheme, which has reduced the length of the illumination light path, but due to the size of the collimation and relay lens illumination light path and the imaging light path including the PBS polarization element, the final result is that the entire light machine light path size is still very large. The illumination light path length designed based on the LCOS chip with a light-emitting surface size of 0.13 inches (aspect ratio 1:1) is 8 mm, the total light machine (including the shell) drainage volume including the imaging light path is 1.1 cc; the illumination light path efficiency is about 30%, the uniformity is more than 80%, and the imaging quality is MTF>0.4 under the Nyquist frequency.

[0048] In order to reduce the volume of the light machine module and improve the light efficiency, the present application provides a light machine module and a near-eye display device, Figure 2 A structure diagram of a light machine module provided by the present application, Figure 3 A structure diagram of another light machine module provided by the present application, referring to Figure 2 And Figure 3The optical mechanism module comprises: an illumination assembly 100, an illumination and imaging multiplexing assembly 300 and a waveguide sheet 200; the illumination assembly 100 and the illumination and imaging multiplexing assembly 300 are located on two sides of the waveguide sheet 200; the illumination and imaging multiplexing assembly 300 comprises, in sequence from the direction in which the illumination assembly 100 points to the waveguide sheet 200, an ommatidium lens 310, a first polaroid 320, a lens group 330 and a light modulator 340, and further comprises a second polaroid 350 located between the lens group 330 and an entrance pupil region of the waveguide sheet 200. The illumination light emitted by the illumination assembly 100 is transmitted along a first direction, is transmitted in sequence through the waveguide sheet 200, the ommatidium lens 310, the first polaroid 320 and the lens group 330, is incident to the surface of the light modulator 340 close to the lens group 330, is modulated into imaging light by the light modulator 340 and is reflected, the imaging light is transmitted along a second direction through the lens group 330 and the second polaroid 350, is incident to the entrance pupil region of the waveguide sheet 200, is transmitted by total reflection in the waveguide sheet 200 and is emitted from an exit pupil region of the waveguide sheet 200 to reach the human eye, and the angle between the first direction and the second direction and the normal line of the light modulator 340 is the same.

[0049] Specifically, the ommatidium lens 310 and the first polaroid 320 collimate the illumination light, the ommatidium lens 310 can comprise two microstructures, the illumination light emitted by the illumination assembly 100 is transmitted through the two microstructures, the two microstructures are spherical and symmetrically distributed.

[0050] It can be understood that, in the embodiment of the utility model, the ommatidium lens 310 and the first polaroid 320 are arranged on the side of the waveguide sheet 200 away from the illumination assembly 100, the distance between the ommatidium lens 310 and the lens group 330 can be shortened, so that the diameter of the light spot incident to the lens group 330 after being transmitted through the ommatidium lens 310 and the first polaroid 320 is small, and therefore a smaller lens group 330 can meet the requirement of better imaging effect, so that the optical mechanism module provided by the utility model can reduce the volume of the optical mechanism module under the premise of ensuring the performance of the optical mechanism.

[0051] Optionally, on the basis of the above embodiment, further referring to Figure 3The lens group 330 comprises, in sequence along the common optical axis pointing to the waveguide sheet 200 direction of the illumination assembly 100, a first aspheric lens 331, a first spherical lens 332, a second aspheric lens 333 and a third aspheric lens 334. The surface of the first aspheric lens 331 close to the side of the first polarizer 320 is a convex surface, and the surface of the first aspheric lens 331 away from the side of the first polarizer 320 is a concave surface; the focal length fg1 of the first aspheric lens 331 satisfies: -40mm≤fg1≤-25mm; the surface of the first spherical lens 332 close to the side of the first aspheric lens 331 is a convex surface, and the surface of the first spherical lens 332 away from the side of the first aspheric lens 331 is a convex surface; the focal length fg2 of the first spherical lens 332 satisfies: 4mm≤fg2≤8mm; the surface of the second aspheric lens 333 close to the side of the first spherical lens 332 is a convex surface, and the surface of the second aspheric lens 333 away from the side of the first spherical lens 332 is a concave surface; the focal length fg3 of the second aspheric lens 333 satisfies: -55mm≤fg3≤-35mm; the surface of the third aspheric lens 334 close to the side of the second aspheric lens 333 is a convex surface, and the surface of the third aspheric lens 334 away from the side of the second aspheric lens 333 is a convex surface; the focal length fg4 of the third aspheric lens 334 satisfies: 3mm≤fg4≤9.5mm; the light modulator 340 comprises a liquid crystal on silicon chip, the size of the liquid crystal on silicon chip is 0.13-0.37 inches, and the field of view angle of the optical-mechanical module is less than or equal to 40 degrees.

[0052] Specifically, the first aspheric lens 331, the second aspheric lens 333 and the third aspheric lens 334 can be even aspheric lenses.

[0053] The embodiment of the utility model discloses through the reasonable setting first aspheric lens 331, first spherical lens 332, second aspheric lens 333 and third aspheric lens 334's face shape and focal length, and the size of liquid crystal on silicon chip, can further reduce the volume of optical-mechanical module, improve the imaging effect.

[0054] Optionally, on the basis of the above embodiment, the surface of the first aspheric lens 331 away from the side of the first polarizer 320 and the surface of the first spherical lens 332 close to the side of the first aspheric lens 331 have a first interval d1, the surface of the first spherical lens 332 away from the side of the first aspheric lens 331 and the surface of the second aspheric lens 333 close to the side of the first spherical lens 332 have a second interval d2, and the surface of the second aspheric lens 333 away from the side of the first spherical lens 332 and the surface of the third aspheric lens 334 close to the side of the second aspheric lens 333 have a third interval d3. The first interval, the second interval and the third interval satisfy: |d1-d2| / 2

[0055] In the embodiment of the utility model, the first distance, the second distance and the third distance satisfy:

[0056] |d1-d2| / 2<d2<3×(d1+d3) can have better imaging effect.

[0057] Optionally, on the basis of the above embodiment, the first spherical lens 332 and the second aspherical lens 333 further include a preset number of glass spherical lenses. The focal length fg31 of the glass spherical lens and the second aspherical lens 333 satisfies: -55mm≤fg31≤-35mm.

[0058] Specifically, 1-2 glass spherical lenses can be further arranged between the first spherical lens 332 and the second aspherical lens 333 to optimize the imaging performance. The calculation formula of the focal length is φ=φ1+φ2-d*φ1*φ2, d is the distance between the two lenses, and φ is the reciprocal of the focal length 1 / f.

[0059] Figure 4 The utility model provides a kind of structure diagram of lighting assembly, and optionally, on the basis of the above embodiment, reference Figure 4 Lighting assembly 100 includes light emitting diode light source 110 and condensing device 120;Light emitting diode light source 110 includes the four-in-one light source of red, green and blue three color light rays exit;Condensing device 120 includes convex lens 121 and fourth aspherical lens 122 sequentially arranged along the direction of waveguide sheet 200 that lighting assembly 100 points to common optical axis.Convex lens 121 far from the surface of light emitting diode light source 110 side is convex, and the focal length f1 of convex lens 121 satisfies: 2mm≤f1≤4.5mm;The two sides of fourth aspherical lens 122 are both convex, and the focal length f2 of fourth aspherical lens 122 satisfies: 2mm≤f2≤4.5mm.

[0060] Specifically, the two sides of fourth aspherical lens 122 can be both even aspherical surface.

[0061] Figure 5 Another structure diagram of lighting assembly is provided for the embodiment of the utility model, and optionally, on the basis of the above embodiment, reference Figure 5 Lighting assembly 100 includes light emitting diode light source 110 and condensing device 130;Light emitting diode light source includes the four-in-one light source of red, green and blue three color light rays exit;Condensing device 130 includes the fifth aspherical lens 131 arranged along the direction of waveguide sheet 200 that lighting assembly 100 points to;At least one side of fifth aspherical lens 131 is convex, and the focal length f3 of fifth aspherical lens 131 satisfies: 1mm≤f3≤5.5mm.

[0062] Specifically, the convex surface of fifth aspherical lens 131 can be even aspherical surface.

[0063] The embodiment of the utility model adopts a piece of fifth aspheric lens 131 as condensing device, can further reduce the volume of light machine module.

[0064] Optionally, on the basis of the above embodiment, the waveguide sheet 200 comprises an array light waveguide or a diffraction light waveguide, when the waveguide sheet 200 is an array light waveguide, the waveguide sheet 200 is internally embedded with a reflecting surface at the entrance pupil area, and the thickness of the waveguide sheet 200 is 0.9mm-1.5mm.

[0065] It should be noted that for the array light waveguide, the coupling-in area should adopt a vertical coupling-in mode, that is, the light coupled out from the light machine is introduced into the waveguide sheet 200 by internally embedding a reflecting surface in the entrance pupil area of the waveguide sheet 200 after the waveguide entrance pupil, and then propagates and splits in the waveguide sheet 200 by total reflection to reach the human eye. For the diffraction waveguide, since the coupling-in grating is an inclined grating or a rectangular grating, the characteristics of 1st-order diffraction propagation are equivalent to the above-mentioned array waveguide coupling-in mode.

[0066] Figure 6 The utility model provides a kind of compound eye optical pupil and waveguide entrance pupil optical path diagram for the embodiment of the utility model, and optionally, on the basis of the above embodiment, reference Figure 6 In the light machine module, the compound eye optical pupil and the waveguide entrance pupil are in a conjugate relationship, the diameter df of the compound eye optical pupil satisfies 2mm≤df≤6mm, the diameter de of the waveguide entrance pupil or the waveguide exit pupil satisfies 2mm≤de≤6mm, the field angle FOVf of the compound eye optical pupil and the field angle FOVe of the waveguide entrance pupil or the waveguide exit pupil satisfy tan (FOVf) / tan (FOVe) =de / df.

[0067] It should be noted that the embodiment of the utility model can optimize the imaging performance of the system by using the object-image conjugate relationship, by adjusting the position and focal length of each lens in the lens group 330 and other parameters, so as to realize the best matching between the object and its image, thereby improving the clarity and accuracy of imaging.

[0068] Optionally, on the basis of the above embodiment, continue to refer to Figure 2 And Figure 3 The light machine module further comprises a protective lens 400 arranged on the side of the waveguide sheet 200 close to the illumination assembly 100, the protective lens 400 comprises transparent plastic or electrochromic lens or photochromic lens, and the transmittance of the transparent plastic is above 80%.

[0069] It can be understood that the transparent plastic is as high-transmissive as possible under the premise of protecting the waveguide sheet 200, and the transmittance is generally above 80%. The protective lens 400 can also be a specially designed lens such as electrochromic lens or photochromic lens, which is used in cooperation with the waveguide sheet 200.

[0070] Based on the above-mentioned embodiment of the utility model scheme, in an embodiment, a light machine module with a field of view angle of 30 degrees is designed based on a 0.13-inch 1:1 format silicon-based liquid crystal chip. The compound eye lens 310 has an exit pupil distance of 0.1 mm, the illumination and imaging multiplexing assembly 300 has an exit pupil distance of 0.6 mm, the illumination and imaging multiplexing assembly 300 has an exit pupil diameter of 2-4 mm, the compound eye lens 310 has a thickness of 0.5 mm, a curvature radius of 0.214 mm, and an imaging quality MTF average of greater than 0.5@122 lp / mm. Table 1 is a specific parameter table of a lens group 330 provided in the embodiment of the utility model:

[0071] Table 1

[0072]

[0073] The illumination assembly 100 designed in the embodiment includes a light-emitting diode light source 110 and a condensing device 130, and the condensing device 130 is a fifth aspherical lens 131. Table 2 is a specific parameter table of the fifth aspherical lens 131 provided in the embodiment of the utility model:

[0074] Table 2

[0075]

[0076] Figure 7 A clarity and line pair number curve provided in the embodiment of the utility model is used to evaluate the clarity (MTF) of the imaging light path under different resolutions (line pairs), Figure 8 A distortion map provided in the embodiment of the utility model, the optical distortion of the light machine module designed by the scheme of the embodiment is less than 2.3%, the illumination uniformity is greater than 80%, and the optical utilization rate reaches 35%. If better imaging indicators are desired, one or two positive spherical lenses can be inserted between the first spherical lens 332 and the second aspherical lens 333.

[0077] In summary, the utility model discloses the embodiment sets up compound eye lens 310 and first polarizer 320 at the side of waveguide sheet 200 away from lighting assembly 100, can shorten the distance between compound eye lens 310 and lens group 330, thereby make the light spot diameter that is transmitted to lens group 330 after compound eye lens 310 and first polarizer 320, therefore can prepare smaller lens group 330 to satisfy the demand of better imaging effect, therefore the light machine module provided by the utility model can reduce the volume of light machine module under the premise of guaranteeing the light machine performance.In addition, by the reasonable setting first aspheric lens 331, first spherical lens 332, second aspheric lens 333 and third aspheric lens 334's face shape and focal length, and the size of silicon-based liquid crystal chip, can further reduce the volume of light machine module, improve imaging effect.Adjusting first spacing, second spacing and third spacing satisfy: | d1-d2 | / 2 < d2 < 3 × (d1+d3) can have better imaging effect.The first spherical lens 332 and the second aspheric lens 333 also include a predetermined number of glass spherical lenses, which can further improve the imaging effect.Using a piece of fifth aspheric lens 131 as a condensing device can further reduce the volume of light machine module.

[0078] The utility model embodiment further provides a near-eye display device, including the light machine module provided by any one of the above embodiments.

[0079] The near-eye display device provided by the utility model embodiment includes the light machine module provided by any one of the above embodiments, and therefore has the same beneficial effects. The content not described in detail in the embodiment can be referred to the light machine module provided by the above embodiments.

[0080] The above specific embodiments do not constitute a limitation on the scope of protection of the utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. An optomechanical module, characterized in that, The application relates to a light-emitting assembly, a light-emitting and imaging multiplexing assembly and a waveguide sheet; the light-emitting assembly and the light-emitting and imaging multiplexing assembly are located on two sides of the waveguide sheet; the light-emitting and imaging multiplexing assembly comprises, in sequence from the direction in which the light-emitting assembly points to the waveguide sheet, an eye lens, a first polarizer, a lens group and a light modulator, and further comprises a second polarizer located between the lens group and an entrance pupil area of the waveguide sheet; the light-emitting assembly emits illuminating light which is transmitted along a first direction, is transmitted through the waveguide sheet, the eye lens, the first polarizer and the lens group in sequence, is incident to the surface of the side of the light modulator close to the lens group, is modulated into imaging light by the light modulator and is reflected, the imaging light is transmitted through the lens group and the second polarizer along a second direction, is incident to the entrance pupil area of the waveguide sheet, is transmitted in the waveguide sheet through total reflection and is emitted from the exit pupil area of the waveguide sheet to reach the human eye, and the angle between the first direction and the second direction and the normal line of the light modulator is the same. The lens group comprises, in sequence from the direction in which the light-emitting assembly points to the waveguide sheet, a first aspheric lens, a first spherical lens, a second aspheric lens and a third aspheric lens which are coaxial; the surface of the side of the first aspheric lens close to the first polarizer is a convex surface, the surface of the side of the first aspheric lens away from the first polarizer is a concave surface, the focal length fgl of the first aspheric lens satisfies the condition of -40mm<=fgl<=-25mm; the surface of the side of the first spherical lens close to the first aspheric lens is a convex surface, the surface of the side of the first spherical lens away from the first aspheric lens is a convex surface, the focal length fg2 of the first spherical lens satisfies the condition of 4mm<=fg2<=8mm; 2. The optical engine module of claim 1, wherein the surface of the side of the second aspheric lens close to the first spherical lens is a convex surface, the surface of the side of the second aspheric lens away from the first spherical lens is a concave surface, the focal length fg3 of the second aspheric lens satisfies the condition of -55mm<=fg3<=-35mm; the surface of the side of the third aspheric lens close to the second aspheric lens is a convex surface, the surface of the side of the third aspheric lens away from the second aspheric lens is a convex surface, the focal length fg4 of the third aspheric lens satisfies the condition of 3mm<=fg4<=9.5mm; the light modulator comprises a liquid crystal on silicon chip, the size of the liquid crystal on silicon chip is 0.13-0.37 inches, and the field of view angle of the optical mechanical module is less than or equal to 40 degrees. the distance between the surface of the side of the first aspheric lens away from the first polarizer and the surface of the side of the first spherical lens close to the first aspheric lens is a first distance d1, the distance between the surface of the side of the first spherical lens away from the first aspheric lens and the surface of the side of the second aspheric lens close to the first spherical lens is a second distance d2, and the distance between the surface of the side of the second aspheric lens away from the first spherical lens and the surface of the side of the third aspheric lens close to the second aspheric lens is a third distance d3. ​ ​ 3. The optical engine module of claim 2, wherein ​ The first distance, the second distance and the third distance satisfy: |d1-d2| / 2 < d2 < 3×(d1+d3).

4. The optical engine module of claim 2, wherein Further comprising: The first spherical lens and the second aspherical lens further comprise a preset number of glass spherical lenses; The combined focal length fg31 of the glass spherical lens and the second aspherical lens satisfies: -55mm ≤ fg31 ≤ -35mm.

5. The optical engine module of claim 1, wherein The illumination assembly comprises a light-emitting diode light source and a condensing device; The light-emitting diode light source comprises a four-in-one light source emitting red, green and blue light rays; and the condensing device comprises a convex lens and a fourth aspherical lens arranged in sequence along the common optical axis of the illumination assembly directed to the waveguide sheet. The surface of the convex lens away from the light-emitting diode light source is a convex surface, and the focal length f1 of the convex lens satisfies: 2mm ≤ f1 ≤ 4.5mm. The two surfaces of the fourth aspherical lens are both convex surfaces, and the focal length f2 of the fourth aspherical lens satisfies: 2mm ≤ f2 ≤ 4.5mm.

6. The optical engine module of claim 1, wherein, The illumination assembly comprises a light-emitting diode light source and a condensing device; The light-emitting diode light source comprises a four-in-one light source emitting red, green and blue light rays; and the condensing device comprises a fifth aspherical lens arranged along the direction of the illumination assembly directed to the waveguide sheet. At least one surface of the fifth aspherical lens is a convex surface, and the focal length f3 of the fifth aspherical lens satisfies: 1mm ≤ f3 ≤ 5.5mm.

7. The optical engine module of claim 1, wherein The waveguide sheet comprises an array optical waveguide or a diffractive optical waveguide; When the waveguide sheet is an array optical waveguide, the waveguide sheet has an embedded reflective surface at the entrance pupil region; The thickness of the waveguide sheet is 0.9mm-1.5mm.

8. The optical engine module of claim 1, wherein, In the optical-mechanical module, the compound eye pupil and the waveguide entrance pupil are in a conjugate relationship. The diameter df of the compound eye pupil satisfies: 2mm ≤ df ≤ 6mm, and the diameter de of the waveguide entrance pupil or the waveguide exit pupil satisfies: 2mm ≤ de ≤ 6mm. The field of view angle FOVf of the compound eye pupil and the field of view angle FOVe of the waveguide entrance pupil or the waveguide exit pupil satisfy: tan(FOVf) / tan(FOVe) = de / df.

9. The optical engine module of claim 8, wherein, The optical-mechanical module further comprises a protective lens arranged on the side of the waveguide sheet close to the illumination assembly; The protective lens comprises a transparent plastic or an electrochromic lens or a photochromic lens, and the transmittance of the transparent plastic is above 80%.

10. A near-eye display device, comprising: The optical-mechanical module comprises any one of claims 1-9.

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