Optical module and display device

Abstract

The application discloses an optical module and a display device, and relates to the technical field of optical modules, and specifically discloses an optical module, which comprises a lens group, wherein the lens group comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens in sequence from an image side to an object side, and the optical powers of the lenses are sequentially set as positive, negative, positive, positive and negative; and the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all plastic lenses. In the application, light emitted by an image source passes through the lenses in the lens group in sequence to form an image on the image side, and since the lenses in the lens group are all plastic lenses and can balance aberration, the optical module can be light and thin and have high light efficiency, thereby reducing the overall power consumption of a head-mounted device and improving wearing comfort.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to an optical module and display device. Background Technology

[0002] Virtual Reality (VR) technology gives users the feeling of being in a virtual world, and almost all categories of immersive virtual reality use head-mounted displays as the key device.

[0003] However, the eyepieces in existing VR headsets are relatively heavy. While this has little impact on non-wearable applications, in wearable applications, the weight reduces wearing comfort. Besides the lack of a lightweight and comfortable fit, the lower light efficiency of the eyepieces leads to higher power consumption and heat generation, resulting in a poor user experience. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide an optical module and a display device to solve the problems of heavy weight and low light efficiency of optical modules in the prior art.

[0005] Therefore, the present invention provides an optical module comprising a lens group, wherein the lens group comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens in sequence from the image side to the object side, and the optical power is set to positive, negative, positive, positive and negative in sequence.

[0006] The first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all plastic lenses.

[0007] In one possible implementation, the first lens is a biconvex lens, the second lens is a biconcave lens, the third lens is a biconvex lens, the fourth lens is a concave-convex lens with its concave surface facing the object, and the fifth lens is a biconcave lens.

[0008] In one possible implementation, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all aspherical lenses.

[0009] In one possible implementation, the optical module satisfies:

[0010] 1 < (f1 + f2 + f3 + f4 + f5) / F < 2; where F is the total effective focal length of the optical module, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, and f5 is the focal length of the fifth lens.

[0011] In one possible implementation, the optical module satisfies:

[0012] 1.2<f1 / F<1.5; -2.5<f2 / F<-2; 1.5<f3 / F<2; 0.9<f1 / f4<1.1; 3 <f2 / f5<4; 1.2<f3 / f1<1.5; -1.8<f2 / f1<-1.5; -1.5<f2 / f3<-1.

[0013] In one possible implementation, the optical module satisfies:

[0014] The range of eye movement is greater than 8mm.

[0015] In one possible implementation, the optical module satisfies:

[0016] Exit pupil distance greater than 15mm.

[0017] In one possible implementation, the first lens, the second lens, and the third lens constitute a cemented triplet lens.

[0018] In one possible implementation, the surfaces of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all coated with an anti-reflective coating.

[0019] On the other hand, embodiments of the present invention also provide a display device, including the optical module described in the above embodiments.

[0020] The beneficial effects of the embodiments of the present invention are as follows:

[0021] This invention provides an optical module and display device. The optical module includes a lens group, which comprises a first lens, a second lens, a third lens, a fourth lens, and a fifth lens in sequence from the image side to the object side. The optical power is set to positive, negative, positive, positive, and negative in sequence. The first, second, third, fourth, and fifth lenses are all plastic through-type lenses. In this application, the light emitted from the image source passes through each lens in the lens group sequentially to form an image at the image side. Since the lenses in the lens group are all plastic lenses and can achieve aberration balance, the optical module can be made thinner and lighter with higher light efficiency, thereby reducing the overall power consumption of the head-mounted device and improving wearing comfort. Attached Figure Description

[0022] Figure 1 The image shown is one of the structural schematic diagrams of an optical module provided in an embodiment of this application;

[0023] Figure 2 The image shown is a second schematic diagram of the structure of an optical module provided in an embodiment of this application;

[0024] Figure 3 The image shows the MTF curve of the optical module at 10 lp / mm;

[0025] Figure 4 The MTF curve of the optical module at 79 lp / mm is shown.

[0026] Figure 5 The image shown is an optical field curve of the optical module;

[0027] Figure 6 The third schematic diagram of an optical module provided in this application embodiment is shown. Detailed Implementation

[0028] The specific embodiments of the optical module and display device provided in the present invention will be described in detail below with reference to the accompanying drawings.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0030] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0033] Figure 1 A schematic diagram of the structure of an optical module provided in this disclosure is shown. Figure 1As shown, the optical module provided in this disclosure includes a lens group and an image source in the order from image to object. In some embodiments, a deflection prism can also be provided between the lens group and the image source. Figure 1 (Not shown in the image), the light emitted from the image source passes through a conversion prism and a lens group in sequence to form an image. Figure 1 The optical path diagram of the aforementioned optical module is also shown, which adopts a reverse optical path design.

[0034] In this embodiment, the image source can be a light-emitting screen such as a microdisplay. For example, the microdisplay can be implemented using technologies such as Organic Light Emitting Diode (OLED), Micro Light Emitting Diode (MicroLED), Digital Light Processing (DLP), or Liquid Crystal on Silicon (LCOS). This application supports the use of a 4k*4k silicon-based OLED (Micro-OLED). Because Micro-OLEDs are self-emissive, their structure is more compact and their size is smaller, which is beneficial for miniaturizing optical modules.

[0035] When the optical module provided in this disclosure is applied in a VR device, the light transmission is as follows: the image on the display screen of the VR device is transmitted and magnified through the optical module described in this embodiment and then transmitted to the human eye. At this time, what the human eye receives through the optical module is a magnified virtual image of the display screen. That is, the light emitted from the display screen is transmitted through the optical module and what the human eye sees is a magnified and inverted virtual image.

[0036] The optical module disclosed herein adopts a straight-through structure, so that light does not need to be reflected multiple times within the system and is transmitted along the same straight line. It has high light efficiency and high resolution. When used on AR devices, it can effectively improve the user's immersion and bring a better user experience.

[0037] In some embodiments, the optical module described above may further include an aperture stop, which is disposed on the image side of the lens group. An aperture stop is a physical entity in an optical system that restricts the beam of light; it can be the edge of a lens, a frame, or a specially designed perforated screen. The function of an aperture stop can be twofold: restricting the beam of light or restricting the size of the field of view (imaging range). The aperture stop that restricts the beam of light the most in an optical system is called the aperture stop, and the aperture stop that restricts the field of view (size) the most is called the field stop. As can be seen above, both the aperture stop and the field stop are physical objects. The general rule for determining the aperture stop of an optical system is: when viewed from an object point, the aperture stop or its image is determined by the angle with the smallest angular size. If the image of an aperture stop has the smallest angular size, then that aperture stop itself is the aperture stop.

[0038] In addition, a protective glass can be installed between the lens group and the image source. The size of the protective glass is set to be no smaller than the size of the image source, and the image source can be isolated and protected by the protective glass.

[0039] In this embodiment, all lenses in the lens group are aspherical lenses. Specifically, such as... Figure 1 As shown, the lens group includes a first lens G1, a second lens G2, a third lens G3, a fourth lens G4, and a fifth lens G5 arranged sequentially from the image side to the object side. The first lens G1, the second lens G2, the third lens G3, the fourth lens G4, and the fifth lens G5 are coaxially arranged.

[0040] An aspherical lens is an optical element whose surface shape is not a traditional spherical surface, but rather an aspherical design. Compared to traditional spherical lenses, it can more precisely control the refraction of light, thereby effectively correcting various aberrations and improving image quality. Its surface can be various aspherical geometric shapes such as parabolic, hyperboloid, and elliptical surfaces. For example, parabolic aspherical lenses are often used in optical systems to more accurately converge parallel light rays to a single point, reducing problems such as light spot diffusion caused by differences in edge refraction in spherical lenses. The thickness of an aspherical lens is often not uniform from the center to the edge, but varies according to a specific functional relationship based on the optical design requirements to achieve the ideal refraction effect of light.

[0041] Because of their unique optical properties, aspherical lenses can achieve the same or even better imaging results with fewer lenses. Therefore, using aspherical lenses in optical systems can reduce the number of lenses, thereby reducing the overall size and weight of the lens. This is crucial for portable optical devices such as VR devices.

[0042] The embodiments of this application use plastic aspherical lenses. The plastic aspherical lenses are manufactured by melting plastic optical materials and injecting them into a specially made mold cavity. This method is low-cost and can produce aspherical lenses with complex shapes, making it suitable for applications in cost-sensitive fields such as consumer electronics. For example, the plastic aspherical lenses in the optical modules of VR / AR devices can be manufactured by the above-mentioned injection molding. Aspherical lenses can provide users with a clear and comfortable virtual or augmented reality visual experience.

[0043] It should be noted that the image side, which is the side observed by the human eye, is arranged in sequence along the line of sight of the human eye when the user uses a VR device with the above-mentioned optical module. The first lens G1, the second lens G2, the third lens G3, the fourth lens G4, and the fifth lens G5 are arranged in sequence.

[0044] The first lens G1, second lens G2, third lens G3, fourth lens G4, and fifth lens G5 are all plastic lenses, forming a through-type optical structure. Because all five lenses are made of plastic, the lens group weighs no more than 20g, achieving a lightweight and thin design. This also allows for an optical length of less than 40mm, which is beneficial for overall miniaturization and reduces user discomfort when used in wearable devices. Optical length refers to the distance between the center point of the first lens and the image source.

[0045] Specifically, the first lens is a biconvex lens, the second lens is a biconcave lens, the third lens is a biconvex lens, the fourth lens is a concave-convex lens with its concave surface facing the object, and the fifth lens is a biconcave lens.

[0046] Specifically, the surface of the lens facing the image side is the first surface, and the surface facing the object side is the second surface. The first surface of the first lens is convex, and the second surface is also convex; the first surface of the second lens is concave, and the second surface is also concave; the first surface of the third lens is convex, and the second surface is also convex; the first surface of the fourth lens is convex, and the second surface is concave; the first surface of the fifth lens is concave, and the second surface is also concave.

[0047] Specifically, the first lens G1 is set to positive optical power, the second lens G2 is set to negative optical power, the third lens G3 is set to positive optical power, the fourth lens G4 is set to positive optical power, and the fifth lens G5 is set to negative optical power. This embodiment has three positive lenses and two negative lenses, which enables aberration balance.

[0048] Specifically, the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, and the fifth lens G5 are all aspherical lenses. It can be seen that the lens group in this embodiment contains five aspherical lenses. Using five aspherical lenses can reduce aberrations such as transverse chromatic aberration and spherical aberration with a very small number of lenses.

[0049] In some implementations, such as Figure 2 As shown, the first lens G1, the second lens G2, and the third lens G3 can form a cemented triplet lens. Specifically, the first lens G1, the second lens G2, and the third lens G3 are arranged in close contact, meaning that the second surface of the first lens G1 is similar in shape to the first surface of the second lens G2, and the second surface of the second lens G2 is similar in shape to the first surface of the third lens G3. Furthermore, the gaps between any two lenses are small, generally not exceeding 0.8 mm. This means that the three lenses can be cemented triplet by appropriate adjustments, or air gaps can be added, such as... Figure 1 As shown.

[0050] Currently, optical modules suffer from poor assembly accuracy due to the large number of lenses. This application uses a three-layer cemented lens, which simplifies the assembly process and improves assembly accuracy.

[0051] In some embodiments, the surfaces of the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, and the fifth lens G5 are all coated with an anti-reflection film. Alternatively, at least one surface of the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, and the fifth lens G5 is coated with an anti-reflection film.

[0052] Antireflective coatings, also known as anti-reflective films, primarily function to reduce or eliminate reflected light from optical surfaces such as lenses, prisms, and plane mirrors, thereby increasing the amount of light transmitted through these components and reducing or eliminating stray light in the system.

[0053] For example, at least one of the first and second surfaces of the first lens G1, the first and second surfaces of the second lens G2, the first and second surfaces of the third lens G3, the first and second surfaces of the fourth lens G4, and the first and second surfaces of the fifth lens G5 is provided with an anti-reflection coating, which can increase the light transmittance.

[0054] In this embodiment, the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, and the fifth lens G5 constitute a direct-through optical structure. Due to the use of direct-through single-pass imaging, the luminous efficiency is high. Furthermore, anti-reflection coatings are deposited on the surface of each lens, further improving the single-pass light transmittance. Therefore, the optical module of this application has high luminous efficiency, which can reduce the overall power consumption of the display device when used, thereby improving the user experience.

[0055] Specifically, the optical module satisfies: 1 < (f1 + f2 + f3 + f4 + f5) / F < 2; where F is the total effective focal length of the optical module, f1 is the focal length of the first lens G1, f2 is the focal length of the second lens G2, f3 is the focal length of the third lens G3, f4 is the focal length of the fourth lens G4, and f5 is the focal length of the fifth lens G5.

[0056] Specifically, the optical modules described above satisfy the following conditions: 1.2 < f1 / F < 1.5; -2.5 < f2 / F < -2; 1.5 < f3 / F < 2; 0.9 < f1 / f4 < 1.1; 3 < f2 / f5 < 4; 1.2 < f3 / f1 < 1.5; -1.8 < f2 / f1 < -1.5; -1.5 < f2 / f3 < -1.

[0057] It should be noted that in practical applications, the air gap behind each lens can be appropriately allocated according to the optical length of the optical module, which is beneficial to the structural design of the imaging lens and facilitates lens assembly and mass production.

[0058] Specifically, the optical module satisfies the following: 0.2 < T1 / TTL < 0.5, 0.06 < T2 / TTL < 0.2, 0.07 < T3 / TTL < 0.3, 0.05 < T4 / TTL < 0.4, 0.08 < T5 / TTL < 0.3; where TTL is the total optical length of the optical module, T1 is the center thickness of the first lens G1, T2 is the center thickness of the second lens G2, T3 is the center thickness of the third lens G3, T4 is the center thickness of the fourth lens G4, and T5 is the center thickness of the fifth lens G5.

[0059] In optical modules, the thickness distribution of each lens is a complex and critical design element, influenced by various factors. For example, the focal length of a lens determines its ability to converge or diverge light, and thickness is closely related to focal length. To achieve a specific focal length, the refractive index and surface radius of curvature of the lens material must be considered, which in turn affects its thickness. Therefore, in an optical module, to ensure the entire system achieves the desired equivalent focal length, the thickness of different lenses needs to be allocated according to the corresponding optical design.

[0060] Aberrations include spherical aberration, coma, astigmatism, field curvature, and distortion. To correct these aberrations, the thickness distribution of each lens needs to be designed specifically. Taking spherical aberration correction as an example, for spherical lenses, the peripheral and central rays cannot converge to the same focal point after refraction, resulting in spherical aberration. This application uses aspherical lenses to improve this. By reasonably increasing or decreasing the thickness of certain lenses, the propagation path of light within the lens is changed, allowing the light to converge more accurately after passing through the entire optical module, thus reducing the impact of aberrations.

[0061] During the assembly of optical modules, the thickness of the lenses also affects the ease and accuracy of assembly. If the lenses are too thin, they are prone to damage or inaccurate installation during clamping, positioning, and other assembly operations; while lenses that are too thick may result in an oversized overall module that does not meet design expectations, and may also increase cumulative errors during assembly. Therefore, the thickness distribution should consider ease of assembly, ensuring that each lens can be accurately installed in its corresponding position within the optical module, working together to achieve good optical functionality.

[0062] In this embodiment, the thickness distribution of each lens in the optical module is appropriate, which helps to reduce the difficulty of lens manufacturing process, thereby saving raw materials and reducing costs; the optical module in this embodiment is small in size and compact in structure, which is conducive to realizing the miniaturization of wearable devices.

[0063] Specifically, the above optical module satisfies: 0≤Air1 / TTL<0.1; 0≤Air2 / TTL<0.1; 0.01≤Air3 / TTL<0.5; 0.01≤Air4 / TTL<0.3; 0.01≤Air5 / TTL<0.5; where Air1 is the air gap behind the first lens G1, Air2 is the air gap behind the second lens G2, Air3 is the air gap behind the third lens G3, Air4 is the air gap behind the fourth lens G4, and Air5 is the air gap behind the fifth lens G5.

[0064] In this embodiment, the air gaps behind each lens are appropriately allocated based on the total optical length of the optical module, which is beneficial to the structural design of the optical module, thereby facilitating module assembly and mass production. The air gap between the fifth lens and the image source is constrained as described above, ensuring the feasibility of structural design and process assembly, while also greatly reducing the module length, which is conducive to achieving miniaturization and mass production of the module.

[0065] Specifically, the aforementioned optical module satisfies the following condition: eye movement range greater than 8mm. This application employs an optical module that uses multiple aspherical lenses to correct aberrations, which maintains a relatively stable imaging effect during eye movement, and the eye movement range is larger within a reasonable range.

[0066] Specifically, the aforementioned optical module satisfies the following condition: exit pupil distance greater than 15mm. The exit pupil of this application is relatively large. Existing through-hole solutions for high-resolution screens generally have a low exit pupil distance, mostly between 11-13mm, in order to achieve higher image quality.

[0067] The optical module provided in this embodiment, based on the above structural design constraints, can achieve the following functions:

[0068] 1. Compatible with 4K high-definition display screens, with an average MTF (modulation transfer function) drop of no more than 0.1 across all fields of view at 10 lp / mm. Figure 3 The MTF curve is shown at 10 lp / mm.

[0069] Figure 4 The MTF curve at 79 lp / mm is shown. Compared to existing through-type solutions, the use of an all-plastic lens reduces weight; the overall lens assembly weighs no more than 20g for the same optical length. Furthermore, it achieves higher resolution (79 lp / mm > 0.2) for 4K display designs. Figure 4 .

[0070] 2. The diameter of the imaging spot is <6μm.

[0071] 3. Figure 5 The image shown is an optical field curve of the aforementioned optical module, as follows: Figure 5As shown, the overall field curvature of the system does not exceed 0.2 mm.

[0072] 4. With a field of view (FOV) > 63°, optical length < 40mm, and overall transmittance > 70%, it achieves high image quality while reducing display power consumption. Compared to the pancake solution (theoretically, the highest transmittance is 25%), it can significantly reduce display power consumption; compared to the Fresnel direct-through solution, it has less stray light, and the utilization rate of light can be improved by coating with an anti-reflective coating.

[0073] For example, the optical module is located on the light-emitting side of the display screen of the VR device. The optical module may also include an adjustment structure for adjusting the distance between the fifth lens and the display screen. The specific structural form of the adjustment structure can be various, and this application does not limit it. This adjustment structure allows the distance between the fifth lens and the display screen to adapt to the degree of myopia in the human eye, thereby obtaining a better image and improving the user experience.

[0074] In addition, such as Figure 6 As shown, the surface shapes of the first and second surfaces of the second lens G2 can also be changed, and the surface shape of the second surface of the fourth lens G4 can be slightly adjusted to achieve the same technical effect as described above.

[0075] like Figure 6 As shown, the optical module provided in this embodiment includes a lens group and an image source in the order from image to object. The lens group includes a first lens G1, a second lens G2, a third lens G3, a fourth lens G4, and a fifth lens G5 arranged sequentially from image to object. The first lens G1, the second lens G2, the third lens G3, the fourth lens G4, and the fifth lens G5 are coaxially arranged. Among them, the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, and the fifth lens G5 are all plastic lenses, and the weight of the lens group does not exceed 20g, which can achieve the effect of a thin and light lens group.

[0076] The first lens G1 has a convex first surface and a convex second surface; the second lens G2 has a concave first surface and a concave second surface; the third lens G3 has a convex first surface and a convex second surface; the fourth lens G4 has a convex first surface and a concave second surface; and the fifth lens G5 has a concave first surface and a concave second surface.

[0077] The first surface profile of the second lens G2 is the same as that of the second surface profile of the first lens G1, and the second surface profile of the second lens G2 is the same as that of the first surface profile of the third lens G3. Therefore, the first lens G1, the second lens G2, and the third lens G3 can be cemented together to form a cemented lens. The cemented lens can simplify the assembly process and improve the assembly accuracy.

[0078] An anti-reflective coating is provided on at least one of the first and second surfaces of the first lens G1, the first and second surfaces of the second lens G2, the first and second surfaces of the third lens G3, the first and second surfaces of the fourth lens G4, and the first and second surfaces of the fifth lens G5. The anti-reflective coating can increase the light transmittance.

[0079] In this embodiment, the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, and the fifth lens G5 constitute a through-type optical structure. Because it employs through-type single-pass imaging, it achieves high luminous efficiency. Furthermore, by coating at least one surface of each lens with an anti-reflection film, the single-pass light transmittance is further improved. Therefore, the optical module of this application has high luminous efficiency, which can reduce the overall power consumption of a display device when used, thereby improving the user experience.

[0080] In this embodiment, the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, and the fifth lens G5 are all aspherical lenses. Based on the law of refraction, light refracts when it enters another medium from one medium. Aspherical lenses, through their unique aspherical surface shape, alter the angle of incidence and angle of refraction of light at different positions, allowing the light to better conform to the ideal imaging path after passing through the lens. For example, in correcting spherical aberration, light rays at the edges of a spherical lens often fail to converge to the same focal point as the central ray, resulting in blurred images. Aspherical lenses, however, through appropriate peripheral thickness design, allow edge light rays to accurately converge to the ideal focal point, greatly improving image sharpness.

[0081] This invention also provides a display device, including the optical module described in the above embodiments. This display device can be a wearable device such as AR or VR, or other devices; this application does not limit its application to these.

[0082] The optical module is located between the human eye and the display screen, positioned in the light-emitting direction of the display screen. The fifth lens G5 is positioned closer to the display screen than the first lens G1. The optical module modulates and transmits the light signal emitted from the display screen to the human eye. Image information emitted from the display screen enters the human eye through the optical system, forming a high-definition magnified virtual image that the user can observe, providing a superior user experience.

[0083] This invention provides an optical module and display device. The optical module includes a lens group, which comprises a first lens, a second lens, a third lens, a fourth lens, and a fifth lens in sequence from the image side to the object side. The optical power is set to positive, negative, positive, positive, and negative in sequence. The first, second, third, fourth, and fifth lenses are all plastic through-hole lenses. In this application, the light emitted from the image source passes through each lens in the lens group sequentially to form an image at the image side. Since the lenses in the lens group are all plastic through-hole lenses, the optical module can be made thinner and lighter with higher light efficiency, thereby reducing the overall power consumption of the head-mounted device and improving wearing comfort.

[0084] It should be noted that:

[0085] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0086] Similarly, it should be understood that, in order to simplify this application and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of this application, various features of this application are sometimes grouped together into a single embodiment, figure, or description thereof. However, this method of disclosure should not be construed as reflecting an intention that the claimed application requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of this application.

[0087] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0088] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0089] The various component embodiments of this application can be implemented in hardware, or as software modules running on one or more processors, or a combination thereof. Those skilled in the art will understand that microprocessors or digital signal processors (DSPs) can be used in practice to implement some or all of the functions of some or all of the components in the virtual machine creation apparatus according to embodiments of this application. This application can also be implemented as a device or apparatus program (e.g., a computer program and computer program product) for performing part or all of the methods described herein. Such an implementation of this application can be stored on a computer-readable medium, or can be in the form of one or more signals. Such signals can be downloaded from an Internet website, provided on a carrier signal, or provided in any other form.

[0090] It should be noted that the above embodiments are illustrative of this application and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. This application can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0091] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An optical module, characterized in that, The optical module includes a lens group, which consists of a first lens, a second lens, a third lens, a fourth lens, and a fifth lens in sequence from the image side to the object side, with the optical power set to positive, negative, positive, positive, and negative in sequence. Among them, the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all plastic lenses; The optical module satisfies the following: 1 < (f1 + f2 + f3 + f4 + f5) / F < 2; 1.2<f1 / F<1.5; -2.5<f2 / F<-2; 1.5<f3 / F<2; 0.9<f1 / f4<1.1; 3 <f2 / f5<4; 1.2<f3 / f1<1.5; -1.8<f2 / f1<-1.5; -1.5<f2 / f3<-1; Wherein, F is the total effective focal length of the optical module, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, and f5 is the focal length of the fifth lens.

2. The optical module according to claim 1, characterized in that, The first lens is a biconvex lens, the second lens is a biconcave lens, the third lens is a biconvex lens, the fourth lens is a concave-convex lens with its concave surface facing the object, and the fifth lens is a biconcave lens.

3. The optical module according to claim 2, characterized in that, The first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all aspherical lenses.

4. The optical module according to claim 1, characterized in that, The optical module meets the following requirement: eye movement range greater than 8mm.

5. The optical module according to claim 1, characterized in that, The optical module satisfies the following condition: exit pupil distance greater than 15mm.

6. The optical module according to claim 2, characterized in that, The first lens, the second lens, and the third lens constitute a cemented three-layer lens.

7. The optical module according to claim 1, characterized in that, The surfaces of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all coated with an anti-reflective coating.

8. A display device, characterized in that, Includes the optical module as described in any one of claims 1-7.

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