Visual optical system and display device

Abstract

The application relates to a visual optical system and a display device. The number of lenses with optical power in the visual optical system is three, the visual optical system comprises a first lens, a second lens and a third lens, the third lens, the second lens and the first lens are sequentially arranged along the incident direction of light; the first lens has positive optical power, the light-incoming surface and the light-outgoing surface of the first lens are both convex surfaces; the second lens has positive optical power, the light-outgoing surface of the second lens is a convex surface; and the third lens has negative optical power, the light-incoming surface and the light-outgoing surface of the third lens are both concave surfaces. The above visual optical system is small in size and weight, and has good imaging quality and high resolution.

Description

Technical Field

[0001] This application relates to the field of visual display technology, and in particular to a visual optical system and display device. Background Technology

[0002] In recent years, the rise of outdoor sports electronic devices has led to the widespread application of display devices, including visual optical systems and microdisplays, in fields such as military, rescue, and outdoor sports. Users are increasingly demanding higher image quality and greater user comfort from these display devices. However, current display devices in this technology are bulky and heavy, have poor image quality, and offer a user experience that needs improvement. Summary of the Invention

[0003] Therefore, it is necessary to provide a visual optical system and display device to address the problems of large size and weight and poor image quality of current display devices.

[0004] A visual optical system, wherein the number of lenses having optical power in the visual optical system is three, the visual optical system includes a first lens, a second lens and a third lens, the third lens, the second lens and the first lens being arranged sequentially along the incident direction of light;

[0005] The first lens has positive optical power, and both its incident and exit surfaces are convex. The second lens has positive optical power, and its exit surface is convex. The third lens has negative optical power, and both its incident and exit surfaces are concave.

[0006] The aforementioned visual optical system, designed as a three-element system, allows for a reasonable design of the optical power and surface shape of the three lenses. This facilitates the correction of various aberrations, such as distortion, and expands the field of view. The system achieves a balance between low distortion and a large field of view, enabling it to obtain a sufficient field of view, good image quality, and high resolution with just three lenses. This, in turn, helps reduce the weight and size of the visual optical system and increases the exit pupil diameter and distance, thus improving the user experience.

[0007] In one embodiment, the visual optical system satisfies the following condition:

[0008] 1≤f1 / f≤2;

[0009] Where f1 is the focal length of the first lens, and f is the focal length of the visual optical system.

[0010] In one embodiment, the visual optical system satisfies the following condition:

[0011] 1≤f² / f≤2;

[0012] Where f2 is the focal length of the second lens, and f is the focal length of the visual optical system.

[0013] In one embodiment, the visual optical system satisfies the following condition:

[0014] -1≤f3 / f≤-0.5;

[0015] Where f3 is the focal length of the third lens, and f is the focal length of the visual optical system.

[0016] In one embodiment, the visual optical system satisfies the following condition:

[0017] Nd3≥1.6;

[0018] Vd3≤35;

[0019] Wherein, Nd3 is the refractive index of the third lens, and Vd3 is the Abbe number of the third lens.

[0020] In one embodiment, the visual optical system satisfies the following condition:

[0021] 0.7≤LD / f≤1;

[0022] Where LD is the exit pupil distance of the visual optical system, and f is the focal length of the visual optical system.

[0023] In one embodiment, the visual optical system satisfies the following condition:

[0024] 0.5≤L / f≤1;

[0025] Wherein, L is the distance on the optical axis from the light-emitting surface of the first lens to the light-incident surface of the third lens.

[0026] In one embodiment, the visual optical system further includes an aperture stop disposed on the light-emitting surface side of the first lens, and the aperture stop has a diameter greater than or equal to 4 mm.

[0027] In one embodiment,

[0028] The incident surface and / or exit surface of the third lens are aspherical; and / or,

[0029] The light-incident surface of the second lens is either a plane or a convex surface.

[0030] A display device includes a display element and a visual optical system as described in any of the above embodiments, wherein the display element is disposed on the light-incident surface side of a third lens of the visual optical system. Attached Figure Description

[0031] Figure 1 These are schematic diagrams of the display device in some embodiments;

[0032] Figure 2 This is a modulation transfer function curve of the visual optical system in the second embodiment;

[0033] Figure 3 The field curvature curve and distortion curve of the visual optical system in the first embodiment are shown.

[0034] Figure 4 This is a magnification chromatic aberration curve of the visual optical system in the first embodiment;

[0035] Figure 5 This is a modulation transfer function curve of the visual optical system in the second embodiment;

[0036] Figure 6 The field curvature curve and distortion curve of the visual optical system in the second embodiment are shown.

[0037] Figure 7 This is a magnification chromatic aberration curve of the visual optical system in the second embodiment.

[0038] Figure label:

[0039] 10. Display device; 11. Display component; 12. Visual optical system; L1. First lens; L2. Second lens; L3. Third lens; 121. Observation position; 122. Aperture. Detailed Implementation

[0040] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0041] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0042] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0046] Please see Figure 1 , Figure 1 The diagram illustrates the structure of a display device 10 in some embodiments of this application. The display device 10 provided in this application includes, but is not limited to, head-mounted display devices such as Virtual Reality (VR) display devices and Augmented Reality (AR) display devices, or handheld display devices such as telescopes. In some embodiments, the display device 10 includes a display element 11 and a visual optical system 12. The display element 11 includes, but is not limited to, an LED display and a Liquid Crystal Display (LCD). The display element 11 has a light-emitting surface, and the visual optical system 12 is disposed on one side of the light-emitting surface of the display element 11. The visual optical system 12 can adjust the light emitted by the display element 11 and direct it to the observation position 121 for the user to view. The side of the visual optical system 12 facing the display element 11 can be understood as the light-incident side of the visual optical system 12, and the side facing the observation position 121 can be understood as the light-emitting side of the visual optical system 12. When using the display device 10, the user's eyeballs can be located at the observation position 121, which corresponds to the imaging surface position of the visual optical system 12.

[0047] Furthermore, in some embodiments, the visual optical system 12 comprises three lenses with optical power, making it a three-element optical system. The visual optical system 12 includes a first lens L1, a second lens L2, and a third lens L3. These lenses are arranged sequentially along the incident direction of light, i.e., from the light incident side to the light emitting side along the optical axis of the visual optical system 12. In some embodiments, the first lens L1 has positive optical power, and both its incident and emitting surfaces are convex. The second lens L2 has positive optical power, and its emitting surface is convex. The third lens L3 has negative optical power, and both its incident and emitting surfaces are concave.

[0048] It should be noted that, in this application, describing the light-incident surface of a lens can be understood as the surface of the lens facing the light-incident side; describing the light-incident surface of a lens as convex can be understood as the light-incident surface of the lens convex towards the light-incident side; describing the light-incident surface of a lens as concave can be understood as the light-incident surface of the lens convex towards the light-outcident side. Similarly, describing the light-outcident surface of a lens can be understood as the surface of the lens facing the light-outcident side; describing the light-outcident surface of a lens as convex can be understood as the light-outcident surface of the lens convex towards the light-outcident side; describing the light-outcident surface of a lens as concave can be understood as the light-outcident surface of the lens convex towards the light-incident side. The light emitted by the display device 11 passes sequentially through the light-incident surface of the third lens L3, the light-outcident surface of the third lens L3, the light-incident surface of the second lens L2, the light-outcident surface of the second lens L2, the light-incident surface of the first lens L1, and the light-outcident surface of the first lens L1 before reaching the observation position 121.

[0049] In the aforementioned visual optical system 12, the negative optical power of the third lens L3, combined with the concave surface design of the light-incident and light-excising surfaces of the third lens L3, helps to increase the field of view of the visual optical system 12. The positive optical power of the second lens L2, combined with the convex surface design of the light-excising surface, helps the light to transition smoothly through the second lens L2, in order to correct aberrations such as distortion. The positive optical power of the first lens L1, combined with the convex surface design of the light-incident and light-excising surfaces, helps to effectively direct the light to the observation position 121. By reasonably adjusting the incident angle of the light at the observation position 121, the resolution of the visual optical system 12 can be improved.

[0050] The aforementioned visual optical system 12 is designed as a three-lens system. The optical power and surface shape of the three lenses are rationally designed, which is beneficial for correcting various aberrations such as distortion of the visual optical system 12, expanding the field of view of the visual optical system 12, and achieving a balance between small distortion and a large field of view. This allows the visual optical system 12 to obtain a sufficient field of view, good image quality, and high resolution with three lenses. Furthermore, it helps to reduce the weight and size of the visual optical system 12 while meeting imaging requirements. Additionally, it helps to increase the exit pupil diameter and exit pupil distance of the visual optical system 12, thus improving the user experience. The visual optical system 12 provided in this application has rationally designed lenses, and the magnification of the visual optical system 12 is greater than or equal to 15 times, for example, 18 times, which satisfies magnification requirements while also possessing good image quality and high resolution.

[0051] In some embodiments, the visual optical system 12 satisfies the condition: 1 ≤ f1 / f ≤ 2; where f1 is the focal length of the first lens L1 and f is the focal length of the visual optical system 12. When the above condition is satisfied, the first lens L1 can effectively direct light to the observation position 121, which also helps to suppress aberrations of the visual optical system 12.

[0052] In some embodiments, the visual optical system 12 satisfies the condition: 1 ≤ f2 / f ≤ 2; where f2 is the focal length of the second lens L2 and f is the focal length of the visual optical system 12. Satisfying the above condition allows the second lens L2 to smoothly transition light rays, which is beneficial for correcting various aberrations such as distortion in the visual optical system 12.

[0053] In some embodiments, the visual optical system 12 satisfies the condition: -1≤f3 / f≤-0.5; where f3 is the focal length of the third lens L3 and f is the focal length of the visual optical system 12. When the above condition is satisfied, the third lens L3 can effectively diffuse light, which is beneficial to expanding the field of view of the visual optical system 12, and also beneficial to suppressing various aberrations such as distortion.

[0054] In some embodiments, the visual optical system 12 satisfies the following conditions: Nd3 ≥ 1.6; Vd3 ≤ 35; where Nd3 is the refractive index of the third lens L3 and Vd3 is the Abbe number of the third lens L3. Satisfying these conditions allows for a reasonable configuration of the optical properties of the material of the third lens L3, resulting in a third lens L3 with a high refractive index and strong dispersion. This is beneficial for correcting chromatic aberration and dispersion aberrations in the visual optical system 12, thereby improving the imaging quality of the visual optical system 12. In some embodiments, the material of the third lens L3 includes, but is not limited to, polyolefin resin, as long as it satisfies the above conditions to correct chromatic aberration and dispersion.

[0055] In some embodiments, the first lens L1 and the second lens L2 are made of a high-refractive-index, low-dispersion material. For example, the refractive index of both the first lens L1 and the second lens L2 is greater than or equal to 1.5, and the Abbe number of both the first lens L1 and the second lens L2 is greater than or equal to 50. This material design, combined with the material design of the third lens L3, helps to correct chromatic aberration and dispersion aberrations in the visual optical system 12, thereby improving the imaging quality of the visual optical system 12. In some embodiments, the materials of the first lens L1 and the second lens L2 include, but are not limited to, crown glass.

[0056] In some embodiments, the visual optical system 12 satisfies the following conditions: 0.7 ≤ LD / f ≤ 1; 0.5 ≤ L / f ≤ 1; where LD is the exit pupil distance of the visual optical system 12, f is the focal length of the visual optical system 12, and L is the distance on the optical axis from the light-emitting surface of the first lens L1 to the light-receiving surface of the third lens L3. Satisfying these conditions not only improves the imaging quality and resolution of the visual optical system 12, but also helps to compress the on-axis dimensions of the visual optical system 12, increase the field of view, exit pupil diameter, and exit pupil distance, thereby effectively improving the user experience.

[0057] In some embodiments, the visual optical system 12 further includes an aperture 122, which may be disposed on the light-emitting surface side of the first lens L1, for example, at the observation position 121. In some embodiments, the aperture of the aperture 122 is greater than or equal to 4 mm, so that the exit pupil diameter of the observation position 121 is greater than or equal to 4 mm, which is beneficial to improving the imaging quality of the visual optical system 12 and the user experience.

[0058] In some embodiments, the incident surface and / or emitting surface of the third lens L3 are aspherical. Therefore, in this application, the description of the surface shape of the incident and emitting surfaces of the third lens L3 can be understood as the surface shape of the incident and emitting surfaces of the third lens L3 at the optical axis. The aspherical design, combined with the surface shape design of the third lens L3, is beneficial for correcting aberrations such as astigmatism, field curvature, and distortion in the visual optical system 12, thereby improving the imaging quality of the visual optical system 12.

[0059] In some embodiments, the light-incident surface of the second lens L2 is either flat or convex. The positive optical power of the second lens L2 and the convex surface design of the light-outceasing surface facilitate reasonable light transition, thereby helping to suppress various aberrations such as distortion in the visual optical system 12 and improve the imaging quality of the visual optical system 12.

[0060] In some embodiments, the distance on the optical axis from the light-emitting surface of the first lens L1 to the observation position 121 is greater than or equal to 12 mm. In some embodiments, the distance on the optical axis from the light-emitting surface of the first lens L1 to the imaging surface of the visual optical system 12 is greater than or equal to 12 mm. This design provides the visual optical system 12 with sufficient exit pupil distance, which is beneficial for the assembly of the visual optical system 12 in the display device 10 and also helps to improve the user experience.

[0061] In some embodiments, within the display device 10, the size of the light-emitting surface of the display device 11 matched with the visual optical system 12 is less than or equal to 0.41 inches. This not only meets the requirements for high imaging quality but also helps to reduce the size of the visual optical system 12, thereby reducing its weight and space occupation and improving the user experience.

[0062] In some embodiments, the display device 10 further includes a housing (not shown), in which the visual optical system 12 and the display device 11 are disposed. The housing may be a mechanical structure in the display device 10 for mounting and protecting the visual optical system 12 and the display device 11.

[0063] The following examples illustrate two embodiments of the visual optical system 12 of this application. The specific configuration of the visual optical system 12 is not limited to the following embodiments.

[0064] First Embodiment

[0065] Please see again. Figure 1 , Figure 1 A schematic diagram of the visual optical system 12 in the first embodiment is shown. In the first embodiment, the light-incident surface of the second lens L2 is a plane, and the light-incident surface of the third lens L3 is an aspherical surface, while the light-exit surface is a spherical surface. Table 1 below shows the parameters of the visual optical system 12 in the first embodiment.

[0066] Table 1

[0067]

[0068]

[0069] Table 2 below shows the aspherical coefficient of the incident surface of the third lens L3 in the first embodiment. The expression for the aspherical coefficient is as follows:

[0070]

[0071] Where Y is the distance between a point on the aspherical curve and the optical axis; Z is the depth of the aspherical surface (the perpendicular distance between a point on the aspherical surface at a distance Y from the optical axis and a tangent plane at the vertex on the optical axis of the aspherical surface); R is the radius of curvature of the vertex of the lens surface; K is the conic constant; A, B, and C are the 4th, 6th, and 8th order aspherical constants, respectively.

[0072] Table 2

[0073] The incident surface of the third lens 8.23 -0.331 8.625E-004 -2.546E-006 9.688E-007

[0074] In the first embodiment, the distance on the optical axis from the light-emitting surface of the second lens L2 to the light-incident surface of the first lens L1 is 1 mm, the distance on the optical axis from the light-emitting surface of the third lens L3 to the light-incident surface of the second lens L2 is 1.66 mm, the focal length f1 of the first lens L1 is 16.73 mm, the focal length f2 of the second lens L2 is 16.84 mm, the focal length f3 of the third lens L3 is -9.5 mm, the focal length f of the visual optical system 12 is 14 mm, and the exit pupil diameter LD of the visual optical system 12 is 12 mm.

[0075] As can be seen from the above data, the visual optical system 12 in the first embodiment satisfies the following conditional expression. The meaning of each parameter and the effect that can be obtained by satisfying the following conditional expression can be obtained from the above description.

[0076] f1 / f=1.2; f2 / f=1.2; f3 / f=-0.7; L / f=0.73; LD / f=0.86.

[0077] In the first embodiment, the distance on the optical axis from the light-emitting surface of the display device 11 to the light-incident surface of the third lens L3 is 3.95 mm. This facilitates the assembly of the display device 11 and the visual optical system 12, and also allows sufficient space for distance adjustment between them to meet the adjustment requirement of ±5 diopter (3.95 ± 0.98 mm). In the first embodiment, the size of the light-emitting surface of the display device 11 is 0.33 inches. In the first embodiment, the field of view of the visual optical system 12 is 33°, which is convenient for user viewing; the exit pupil diameter is 4.5 mm, which is beneficial for matching different pupil sizes; and the exit pupil distance is 12 mm, which helps improve the user experience.

[0078] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, Figure 2 , Figure 3 and Figure 4 These are, respectively, the modulation transfer function (MTF) curve, field curvature and distortion curve, and magnification chromatic aberration curve of the visual optical system 12 in the first embodiment. Figures 2-4 It can be seen that the field curvature, astigmatism, magnification chromatic aberration, and other aberrations of the visual optical system 12 can be effectively corrected, with distortion less than 1%, and it has good imaging quality and high resolution.

[0079] Second Embodiment

[0080] In the second embodiment, the light-incident surface of the second lens L2 is planar, and both the light-incident and light-exit surfaces of the third lens L3 are aspherical. Table 3 below shows the parameters of the visual optical system 12 in the second embodiment.

[0081] Table 1

[0082]

[0083] Table 2 below shows the aspherical coefficients of the incident surface of the third lens L3 in the second embodiment, and the meaning of each parameter can be obtained from the above description.

[0084] Table 2

[0085] The light-emitting surface of the third lens -22.03 7.365 3.128E-004 -4.037E-006 5.293E-008 The incident surface of the third lens 16.46 -8.416 1.160E-004 -1.291E-005 2.679E-007

[0086] In the second embodiment, the distance on the optical axis from the light-emitting surface of the second lens L2 to the light-incident surface of the first lens L1 is 0.1 mm, the distance on the optical axis from the light-emitting surface of the third lens L3 to the light-incident surface of the second lens L2 is 1.72 mm, the focal length f1 of the first lens L1 is 18.1 mm, the focal length f2 of the second lens L2 is 22.2 mm, the focal length f3 of the third lens L3 is -14.1 mm, the focal length f of the visual optical system 12 is 15.7 mm, and the exit pupil diameter LD of the visual optical system 12 is 15 mm.

[0087] As can be seen from the above data, the visual optical system 12 in the second embodiment satisfies the following conditional expression. The meaning of each parameter and the effect that can be obtained by satisfying the following conditional expression can be obtained from the above description.

[0088] f1 / f=1.15; f2 / f=1.41; f3 / f=-0.9; L / f=0.78; LD / f=0.96.

[0089] In the second embodiment, the distance on the optical axis from the light-emitting surface of the display device 11 to the light-incident surface of the third lens L3 is 4.9 mm. This facilitates the assembly of the display device 11 and the visual optical system 12, and also allows sufficient space for distance adjustment between them to meet the adjustment requirements of ±5 diopter (4.9 ± 1.25 mm). In the second embodiment, the size of the light-emitting surface of the display device 11 is 0.41 inches. In the second embodiment, the field of view of the visual optical system 12 is 37°, which is convenient for user viewing; the exit pupil diameter is 5 mm, which is beneficial for matching different pupil sizes; and the exit pupil distance is 15 mm, which helps improve the user experience.

[0090] Combination Figure 5 , Figure 6 and Figure 7 As shown, Figure 5 , Figure 6 and Figure 7 These are, respectively, the modulation transfer function (MTF) curve, field curvature and distortion curve, and magnification chromatic aberration curve of the visual optical system 12 in the second embodiment. Figures 5-7 It can be seen that the field curvature, astigmatism, magnification chromatic aberration, and other aberrations of the visual optical system 12 can be effectively corrected, with distortion less than 1%, and it has good imaging quality and high resolution.

[0091] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A visual optical system, characterized in that, The visual optical system has three lenses with optical power. The visual optical system includes a first lens, a second lens, and a third lens. The third lens, the second lens, and the first lens are arranged sequentially along the incident direction of the light. The first lens has positive optical power, and both its incident and exit surfaces are convex. The second lens has positive optical power, and its exit surface is convex. The third lens has negative optical power, and both its incident and exit surfaces are concave. The incident and exit surfaces of the first and second lenses are spherical, while the incident and / or exit surfaces of the third lens are aspherical. The visual optical system satisfies the following condition: 1≤f² / f≤2; 0.7≤LD / f≤1; Where f2 is the focal length of the second lens, f is the focal length of the visual optical system, and LD is the exit pupil distance of the visual optical system; The magnification of the visual optical system is greater than or equal to 15.

2. The visual optical system according to claim 1, characterized in that, The visual optical system satisfies the following condition: 1≤f1 / f≤2; Where f1 is the focal length of the first lens, and f is the focal length of the visual optical system.

3. The visual optical system according to claim 1, characterized in that, The visual optical system satisfies the following condition: -1≤f3 / f≤-0.5; Where f3 is the focal length of the third lens, and f is the focal length of the visual optical system.

4. The visual optical system according to claim 1, characterized in that, The visual optical system satisfies the following condition: Nd3≥1.6; Vd3≤35; Wherein, Nd3 is the refractive index of the third lens, and Vd3 is the Abbe number of the third lens.

5. The visual optical system according to claim 1, characterized in that, The visual optical system satisfies the following condition: 0.5≤L / f≤1; Wherein, L is the distance on the optical axis from the light-emitting surface of the first lens to the light-incident surface of the third lens.

6. The visual optical system according to claim 1, characterized in that, The visual optical system further includes an aperture stop, which is disposed on one side of the light-emitting surface of the first lens, and the aperture stop has a diameter greater than or equal to 4 mm.

7. The visual optical system according to claim 1, characterized in that, The light-incident surface of the second lens is either a plane or a convex surface.

8. The visual optical system according to claim 1, characterized in that, The refractive indices of both the first lens and the second lens are greater than or equal to 1.5, and the Abbe numbers of both the first lens and the second lens are greater than or equal to 50.

9. A display device, characterized in that, The system includes a display device and a visual optical system as described in any one of claims 1-8, wherein the display device is disposed on the light-incident surface side of the third lens of the visual optical system.

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