Single-image-source virtual reality display system

Abstract

The utility model discloses a single image source virtual reality display system, comprising a spectroscope used for transmitting and reflecting light of an image source and respectively forming a transmission light path and a first reflection light path; the field lens is arranged on the transmission light path and is used for forming an isometric real image of the image source; the reflector is arranged on one side, far away from the spectroscope, of the field lens and is used for reflecting light rays emitted from the real image position after the transmission light path of the image source penetrates through the field lens to form a second reflection light path; the first eyepiece is arranged on the first reflection light path and is used for forming a first magnified virtual image of the image source; and the second eyepiece is arranged on the second reflection light path and is used for forming a second amplified virtual image of the image source. According to the single-image-source virtual reality display system, the light of the image source is reflected through the spectroscope, the field lens and the reflector to form two parallel light paths, and single-image-source binocular virtual reality display is realized by combining the two eyepieces, so that the weight of the system is reduced, and the overall cost of the system is reduced.

Description

Technical Field

[0001] The utility model relates to a single-image source virtual reality display system, belonging to the field of virtual reality equipment. Background Art

[0002] With the continuous development of science and technology, virtual reality technology, as the forefront of the new generation of information technology, has achieved leapfrog development, and its forms and types are becoming increasingly diverse, and its application fields are becoming more and more extensive. In order to make near-eye display devices more compact, thin and light while maintaining good optical properties, the folded optical path increases the optical path by increasing reflection, greatly reducing the size of near-eye display devices, and gradually becoming the development direction of consumer-grade VR optics with its light weight, high image quality and gradually mature mass production process.

[0003] Currently, virtual reality display devices use two independent optical modules to achieve binocular display and are adapted to two display screens. Among them, the cost of the display screen has a greater impact on the overall cost of the equipment. At the same time, the setting of the display screen and its associated circuits has a greater impact on the weight of the binocular display system. In order to reduce costs, reduce weight, and improve user experience, it is necessary to provide a single-image source virtual reality display system. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a single-image source virtual reality display system.

[0005] In order to achieve the above technical objectives, the utility model adopts the following technical solutions:

[0006] A single-image source virtual reality display system, comprising:

[0007] A beam splitter, used for transmitting and reflecting the light from the image source, and forming a transmission light path and a first reflection light path respectively;

[0008] A field lens, arranged on the transmission light path, for forming an upright real image of the image source of equal size;

[0009] A reflector, arranged at a side of the field lens away from the beam splitter, for reflecting the light emitted from the real image position after the transmission light path of the image source passes through the field lens, to form a second reflected light path;

[0010] a first eyepiece, disposed on the first reflected light path, for forming a first magnified virtual image of the image source;

[0011] The second eyepiece is arranged on the second reflected light path and is used to form a second magnified virtual image of the image source; the first magnified virtual image and the second magnified virtual image are of the same size and have the same virtual image distance.

[0012] Preferably, both the first eyepiece and the second eyepiece are polarization folding systems implemented based on a beam splitter film, a quarter wave plate, a reflective polarizer and at least one lens.

[0013] Preferably, the at least one lens comprises a lens disposed between the beam splitter film and the quarter wave plate.

[0014] Preferably, the at least one lens comprises a compensation lens disposed on a side of the reflective polarizer close to a human eye.

[0015] Preferably, the total optical length of the first eyepiece and the second eyepiece is between 10 and 20 mm, the distance from the plane of the first eyepiece facing the image source side to the beam splitter is between 10 and 20 mm, and the distance from the plane of the second eyepiece facing the image source side to the reflector is between 10 and 20 mm.

[0016] Preferably, the transmittance-reflection ratio of the beam splitter is greater than 1.

[0017] Preferably, the transmittance-reflection ratio of the beam splitter is between 1.2 and 2.5.

[0018] Preferably, the distance from the image source to the beam splitter is equal to the distance from the real image to the reflector.

[0019] Preferably, the field lens is arranged on a conjugate plane of the image source with respect to the beam splitter, the object plane and the principal plane of the field lens coincide, and its magnification is 1; the distance from the field lens to the beam splitter is greater than the distance from the field lens to the reflector.

[0020] Preferably, the beam splitter and the reflector are parallel, and the angle between the normal line of the beam splitter and the normal line of the reflector and the main light of the image source is between 44° and 46°.

[0021] Preferably, the image source is realized by a display screen and a polarization optical element, and the polarization optical element is arranged on the light emitting surface of the display screen to provide polarized light.

[0022] The single-image source virtual reality display system provided by the utility model folds the light of the image source through a beam splitter, a field lens and a reflector to form two parallel light paths, and realizes the exit pupils corresponding to the left eye and the right eye respectively in combination with two eyepieces, thereby realizing a single-image source binocular virtual reality display, reducing the weight of the system, and reducing the overall cost of the system. Among them, the light of the image source is reflected and transmitted through the beam splitter, and the transmitted light is imaged through the field lens to form an equal-sized real image of the image source, and then the light emitted from the real image position of the transmitted light path is folded through the reflector to realize the folding of the two parallel light paths. By adjusting the transmission-reflection ratio of the above-mentioned beam splitter and adjusting the parameters of the field lens, the consistency of the two exit pupil parameters can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an imaging principle diagram of Example 1 provided by the utility model;

[0024] Figure 2 is an imaging principle diagram of the first reflection light path of Example 1;

[0025] Figure 3 is an imaging principle diagram of the second reflection light path of Example 1;

[0026] Figure 4 is an imaging principle diagram of the first reflection light path of Example 2;

[0027] Figure 5 This is a diagram showing the imaging principle of the second reflection light path in Example 2. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0031] The purpose of the utility model is to provide a module for realizing binocular display through a single screen, aiming to improve the problems of high cost, heavy weight and poor wearing experience of the existing optical system to a certain extent. The single image source virtual reality display system provided by the utility model, the light emitted by the image source is divided into two by a beam splitter, one light is reflected by the beam splitter and enters the left (or right) optical system and enters the human eye, and the other light is transmitted by the beam splitter to the field lens located on the conjugate surface of the image source, the field lens converges the part of the light into an upright and enlarged real image, and converges the transmitted light to the right (or left) reflector, the reflector reflects the light converged by the field lens to the right (or left) optical system and enters the human eye, the left optical system and the right optical system are respectively a set of eyepieces, and the light of the image source forms an enlarged virtual image in the left eye and the right eye respectively through the above optical system, thereby realizing the single screen lighting binocular device.

[0032] like Figures 1 to 5 As shown, the single-image source virtual reality display system provided by the utility model comprises: an image source 10, a beam splitter 11, a field lens 12, a reflector 13, a first eyepiece 100 (300) and a second eyepiece 200 (400); wherein the beam splitter 11 is used to transmit and reflect the light of the image source 10, and form a transmission light path and a first reflection light path respectively; the field lens 12 is arranged on the transmission light path, and is used to form an upright real image 14 of the image source 10 of the same size; the reflector 13 is arranged on the side of the field lens 12 away from the beam splitter 11, and is used to The first eyepiece 100 (300) is arranged on the first reflected light path to form a first magnified virtual image of the image source 10; the second eyepiece 200 (400) is arranged on the second reflected light path to form a second magnified virtual image of the image source 10; the first magnified virtual image and the second magnified virtual image are equal in size and have the same virtual image distance (or the two are slightly different but the difference is within the range that does not affect the normal binocular vision of the human eye). The above-mentioned single-image source virtual reality display system refracts the light of the image source 10 through the beam splitter 11, the field lens 12 and the reflector 13 to form two parallel light paths, and combines the two eyepieces to respectively realize the exit pupils corresponding to the left eye and the right eye, thereby realizing a single-image source binocular virtual reality display and reducing the overall cost of the system.

[0033] Specifically, the image source 10 is implemented by an OLED display screen or an LCD display screen, and the size of the display screen is between 0.49 inches and 1.4 inches. The outer side of the display screen contains at least one polarization composite film layer, and the polarization composite film layer contains at least one absorption polarization film (POL) and a quarter phase delay plate (QWP) to improve contrast and reduce stray light. The polarization composite film layer may also contain an anti-reflection film (AR film).

[0034] The beam splitter 11 is arranged in the light emitting direction of the image source 10, and the distance from the image source 10 to the beam splitter 11 is between 5mm and 15mm. The beam splitter 11 is coated with a beam splitter film, and the transmittance-reflection ratio of the beam splitter film should be greater than 1, preferably in the range of 1.2-2.5.

[0035] The field lens 12 is arranged on the side of the beam splitter 11 away from the image source 10, and is located on the conjugate plane of the image source relative to the beam splitter 11. The field lens 12 can be a single-piece, double-piece, multi-piece or positive-negative cemented lens. The overall thickness of the field lens 12 is between 2mm and 10mm. The object plane and the principal plane of the field lens coincide, and the magnification of the field lens is 1. The transmitted light of the image source 10 passing through the beam splitter is shaped by the field lens and converges to form an equal-sized upright real image 14. This design utilizes the characteristics of the field lens magnification of 1 and its light forming a uniformly sized focused light spot in the plane to realize the lighting of the binocular device with a single screen, which to a certain extent improves the problems of heavy weight and poor wearing experience in the existing optical system.

[0036] The reflector 13 is arranged on the transmission light path of the image source 10, and is arranged on the side of the field lens 12 away from the image source 10. The distance from the display screen 10 to the beam splitter 11 is equal to or close to the distance from the real image 14 formed by the image source 10 through the field lens 12 to the reflector 13. The distance from the field lens 12 to the beam splitter 11 is greater than the distance from the field lens 12 to the reflector 13. The distance between the field lens 12 and the beam splitter 11 is between 25 mm and 45 mm. The distance from the field lens 12 to the reflector 13 is between 10 mm and 20 mm.

[0037] The reflector 13 is coated with a reflective film with a reflectivity close to 100% to improve the light energy utilization rate of the transmission light path. The beam splitter 11 and the reflector 13 are parallel, and the angle between the normal line of the beam splitter 11 and the normal line of the reflector 13 and the main light of the image source 10 is between 44° and 46°.

[0038] The total optical length of the first eyepiece 100 (300) and the second eyepiece 200 (400) is between 10 mm and 20 mm. The distance from the image source side surface of the first eyepiece 100 (300) to the beam splitter 11 and the distance from the image source side surface of the second eyepiece 200 (400) to the reflector 13 are both between 10 mm and 20 mm. In this embodiment, the optical path principles of the first eyepiece 100 (300) and the second eyepiece 200 (400) are the same. The first eyepiece 100 (300) and the second eyepiece 200 (400) are both polarization folding systems based on a beam splitter film, a quarter wave plate, a reflective polarizer and at least one lens. At least one lens of the first eyepiece 100 (300) and the second eyepiece 200 (400) includes a main lens arranged between the beam splitter film and the quarter wave plate, and may also include a compensation lens arranged on the side of the reflective polarizer close to the human eye. The arrangement of the above-mentioned main lens and compensation lens is not the focus of improvement of the present application.

[0039] The design of the utility model is described in detail below with two specific embodiments. Figures 1 to 3 In the embodiment 1 shown, the optical systems of the first eyepiece 100 and the second eyepiece 200 are the same, and the field lens 13 is implemented using a single lens. Figure 4 and Figure 5 In the illustrated embodiment 2, the optical systems of the first eyepiece 300 and the second eyepiece 400 are different, and the field lens 13 is implemented using a positive-negative cemented lens.

[0040] Example 1

[0041] exist Figures 1 to 3 In the illustrated embodiment, the single-image source virtual reality display system includes: an image source 10 , a beam splitter 11 , a field lens 12 , a reflector 13 , a first eyepiece 100 , and a second eyepiece 200 .

[0042] The display screen used is a 0.49-inch OLED display screen. A composite polarizing film is attached to the outside of the display screen, and from the inside to the outside of the screen, there are AR film, QWP, POL, QWP and AR film.

[0043] The beam splitter 11, the field lens 12, the reflector 13 and the image source 10 are arranged along the same straight line. The distance from the display screen to the beam splitter 11 is 10 mm, the distance from the field lens 12 to the beam splitter 11 is 36 mm, and the distance from the field lens 12 to the reflector 13 is 17 mm.

[0044] The beam splitter 11 and the reflector 13 are respectively made of flat glass and are arranged at a horizontal tilt of 45 degrees. The beam splitter 11 uses a four-reflection six-transmission beam splitting film, and the surface of the reflector 13 is provided with a full reflection film.

[0045] In this embodiment, the field lens 12 uses a meniscus positive lens, and both side surfaces of the field lens 12 are concave toward the image source 10. The field lens 12 is coated with an anti-reflection film on both sides. The curvature radius of the surface of the field lens 12 facing the image source is -32.5 mm, and the curvature radius of the surface facing the human eye is -25.95 mm. The thickness is 1 mm and the refractive index is 1.49.

[0046] The light emitted by the display screen is split into two by the beam splitter 11, and the reflected light passes through the left eye optical system and returns in the optical system before entering the human eye (such as Figure 2 The transmitted light passes through the field lens 12 to form an upright real image of equal size, and the light of the real image continues to propagate to the reflector 13, enters the right eye optical system after reflection, and returns to the human eye after being reflected in the optical system (as shown in FIG. Figure 3 shown).

[0047] The first eyepiece 100 and the second eyepiece 200 used in this embodiment are three-piece pancake optical solutions. The first eyepiece 100 and the second eyepiece 200 are used in the same combination, and the total optical length is 15 mm. In addition, the distance from the side surface of the first eyepiece 100 and the second eyepiece 200 facing the image source to the next optical surface (beam splitter 11, reflector 13) is 15 mm.

[0048] Figure 2 and Figure 3 The optical principles of the two optical paths are respectively given. The following description is made by taking the first eyepiece 100 as an example, and the system structure of the second eyepiece is the same, which will not be repeated here.

[0049] The first eyepiece 100 includes a first main mirror 21 and a second main mirror 22 arranged from the image source side to the human eye side, and the second main mirror 22 and the first main mirror 21 are respectively a positive lens and a negative lens. Among them, a beam splitter film is arranged on the surface of the first main mirror 21 away from the human eye side, and a polarization composite plate 23 is arranged on the side of the second main mirror 22 facing the human eye. The polarization composite plate 23 is arranged through a plane substrate 24. The polarization composite plate 23 is an absorption polarizer, a reflection polarizer, a quarter phase delay plate and an anti-reflection film from left to right, thereby forming a polarization folded light path between the beam splitter film and the reflection polarizer.

[0050] Table 1 lists schematic parameters of each lens in Example 1. For convenience of description, each surface is marked from left to right in the table. For example, the surface of the substrate 24 close to the human eye is S101, and the surface close to the object side is S102. The surface of the second lens 22 close to the human eye is S103, and the surface close to the object side is S104. The surface of the first main mirror 21 close to the human eye is S105, and the surface close to the object side is S106.

[0051] Table 1 Surface parameters of each optical surface in the first eyepiece 100 in Example 1

[0052] Surface marking Curvature radius (mm) Thickness(mm) Face type Refractive Index Abbe number S101 unlimited 0.7 Spherical 1.51 64 S102 unlimited 2.3 Spherical S103 51.68 2 Spherical 1.65 52 S104 83.58 5 Spherical S105 -179.64 5 Spherical 1.79 28 S106 -461.92 15 Spherical

[0053] In the above optical system, the total optical length of the first eyepiece 100 (the distance from the side surface of the compensation mirror 34 facing the human eye to the dichroic surface of the main lens) is 15 mm, and the distance from the side surface of the first main mirror 21 facing the image source to the dichroic mirror is 15 mm.

[0054] The second eyepiece 200 includes a first main mirror 31 and a second main mirror 32 arranged from the image source side to the human eye side, and the second main mirror 32 and the first main mirror 31 are respectively a positive lens and a negative lens. Among them, the first main mirror 31 is provided with a beam splitter film on the side away from the human eye, and the second main mirror 32 is provided with a polarization composite plate 33 on the side facing the human eye. The polarization composite plate 33 is provided through a plane substrate 34. The polarization composite plate 33 is an absorption polarizer, a reflection polarizer, a quarter phase delay plate and an anti-reflection film from left to right, thereby forming a polarization folded optical path between the beam splitter film and the reflection polarizer. The system structure and optical path principle of the second eyepiece 200 and the first eyepiece 100 are exactly the same, and will not be repeated here.

[0055] like Figures 1 to 3 As shown, the non-polarized light emitted by the display screen is modulated into circularly polarized light by the composite polarizing film 2, and the circularly polarized light is split into two by the beam splitter 11, and the reflected light enters the human eye through the left-eye optical system. The transmitted light passes through the field lens 12 to form an upright and equal-sized real image, and the light of the real image continues to propagate to the reflector 13 to enter the right-eye optical system and then returns in the optical system to reach the human eye.

[0056] Specifically, the non-polarized light emitted from the display screen is circularly polarized (assuming it is left-handed circularly polarized light) after passing through the composite polarizing film, and forms a first reflection light path after being reflected by the beam splitter 11, and forms a transmission light path after being transmitted by the beam splitter 11. In the first reflection light path, the light enters the left-eye optical system through the beam splitting surface S106, passes through the first main lens 21 and the second main lens 22, and changes to linearly polarized S light after passing through the 1 / 4 phase delay plate in the polarization composite plate 23. The light is reflected after reaching the reflective polarizer in the polarization composite plate 23, and its polarization state remains unchanged. After passing through the 1 / 4 phase delay plate again, it changes back to left-handed circularly polarized light. The light passes through the second main lens 22 and the first main lens 21, and is reflected by the beam splitter at the surface S106. The polarization state of the reflected light changes from left-handed circularly polarized light to right-handed circularly polarized light, and then passes through the first main lens 21 and the second main lens 22, and changes to linearly polarized P light after passing through the 1 / 4 phase delay plate for the third time, and passes through the reflective polarizer and the absorption polarizer, and then passes through the substrate 24, and finally reaches the exit pupil. The light transmitted through the beam splitter 11 forms an upright real image of equal size through the field lens 12, and the light of the real image continues to propagate to the reflector 13 to be reflected, forming a second reflected light path; the light in the second reflected light path enters the right eye optical system and reaches the human eye after being reflected back in the optical system; the optical principles of the second reflected light path are the same as those of the first reflected light path, which will not be repeated here.

[0057] Example 2

[0058] Figure 4 and Figure 5 An optical principle diagram of Example 2 is given, in which the field lens 12 includes a positive-negative cemented lens; the imaging principles of the first eyepiece 300 and the second eyepiece 400 are the same, but different optical systems are used; the arrangement of other optical elements is the same as that of Example 1, and only the contents of Example 2 that are different from Example 1 are introduced in detail below.

[0059] Specifically, if Figure 4 and Figure 5 The single-image source augmented reality display system shown includes a binocular optical module (including a first eyepiece 300 and a second eyepiece 400) arranged from an exit pupil to an entrance pupil, a reflector 13, a field lens 12, a beam splitter 11 and a display screen 10.

[0060] In this embodiment, the display screen uses a 0.6-inch OLED display screen. A composite polarizing film is attached to the outside of the display screen, and from the inside to the outside of the screen, there are AR, QWP, POL, QWP and AR.

[0061] The display screen, the beam splitter 11, the field lens 12, the reflector 13, the first eyepiece 300 and the second eyepiece 400 are arranged in the same manner as the components in Example 1. The distance from the display screen to the beam splitter 11 is 10 mm, the distance from the field lens 12 to the beam splitter 11 is 25 mm, and the distance from the field lens 12 to the reflector 13 is 10 mm.

[0062] In this embodiment, the field lens 12 is a positive-negative cemented lens with anti-reflection film coated on both sides. The design parameters of the field lens 12 are shown in Table 2, where the surfaces arranged from the human eye side to the image source side are marked with S201, S202, S203 and S204, the lens 12A close to the human eye side is a positive lens, and the lens 12B far from the human eye side is a negative lens.

[0063] Table 2 Surface parameters of the field lens 12 in Example 2

[0064] Surface marking Curvature radius (mm) Thickness(mm) Face type Refractive Index Abbe number S201 108.24 1.5 Spherical 1.78 25 S202 52.41 0 Spherical S203 52.41 3 Spherical 1.49 81 S204 689.17 25 Spherical

[0065] In this embodiment, the first eyepiece 300 and the second eyepiece 400 are three-piece glued pancake optical solutions, which are respectively a compensating mirror 44 (54), a second main mirror 42 (52) and a first main mirror 41 (51) from left to right. A beam splitter film is arranged on the side of the first main mirror 41 (51) away from the human eye, and a polarization beam splitter element 43 (53) is arranged between the compensating mirror and the second main mirror. Among them, the left and right modules in the binocular optical module are different modules. The total optical length of the left-eye optical system (first eyepiece 300) is 9 mm, the distance from the side surface of the first main mirror 41 facing the image source to the reflector is 15 mm, and the exit pupil distance is 19 mm; the total optical length of the right-eye optical system (second eyepiece 400) is 12 mm, the distance from the side surface of the first main mirror 51 facing the image source to the reflector is 15 mm, and the exit pupil distance is 15 mm.

[0066] Tables 3 and 4 list schematic parameters of each lens in the first eyepiece 300 and the second eyepiece 400 in Example 2. For the convenience of description, the surfaces are marked from left to right in the table. In the first eyepiece 300, lens 44 is a concave lens, the polarization composite sheet 43 is attached to the surface of the lens 44 away from the human eye, lens 42 is a concave lens, lens 41 is a convex lens, the surface of the lens 41 away from the human eye is a splitter surface, and lenses 54, 52 and 51 are glued together; in the second eyepiece 400, lens 54 is a concave lens, the polarization composite sheet 53 is attached to the surface of the lens 54 away from the human eye, lens 52 is a concave lens, lens 51 is a convex lens, the surface of the lens 51 away from the human eye is a splitter surface, and lenses 54, 52 and 51 are glued together.

[0067] Table 3 Surface parameters of each optical surface in the first eyepiece 300 in Example 2

[0068]

[0069]

[0070] Table 4 Surface parameters of the optical surfaces in the second eyepiece 400 in Example 2

[0071] Surface marking Curvature radius (mm) Thickness(mm) Face type Refractive Index Abbe number S401 -83.36 5 Spherical 1.49 81 S402 -140.23 0.3 Spherical S403 -140.23 2.92 Spherical 1.61 59 S404 -170.51 0 Spherical S405 -170.51 3.81 Spherical 1.54 58 S406 -84.47 15 Spherical

[0072] The optical path principle of embodiment 2 is similar to that of embodiment 1, and will not be described again here.

[0073] In summary, the above-mentioned single-image source virtual reality display system provided by the utility model refracts the light of the image source through a beam splitter, a field lens and a reflector to form two parallel light paths, and combines two pancake eyepieces to realize single-image source binocular virtual reality display, thereby reducing the weight of the system, reducing the overall cost of the system, and improving the user experience.

[0074] The above is a detailed description of a single-source virtual reality display system provided by the utility model. For those skilled in the art, any obvious changes made to the utility model without departing from the essence of the utility model will constitute an infringement of the patent right of the utility model and will bear corresponding legal responsibilities.

Claims

1. A single-image source virtual reality display system, characterized in that include: A beam splitter, used for transmitting and reflecting the light from the image source, and forming a transmission light path and a first reflection light path respectively; A field lens, arranged on the transmission light path, for forming an upright real image of the image source of equal size; a reflector, arranged on a side of the field lens away from the beam splitter, for reflecting the light emitted from the real image position after the transmission light path passes through the field lens, to form a second reflection light path; a first eyepiece, disposed on the first reflected light path, for forming a first magnified virtual image of the image source; The second eyepiece is arranged on the second reflected light path, and is used for forming a second magnified virtual image of the image source; the first magnified virtual image and the second magnified virtual image are of the same size and have the same virtual image distance.

2. The single-source virtual reality display system according to claim 1, characterized in that: The first eyepiece and the second eyepiece are both polarization folding systems realized based on a beam splitter film, a quarter wave plate, a reflective polarizer and at least one lens.

3. The single-source virtual reality display system according to claim 2, characterized in that: The at least one lens includes a lens disposed between the beam splitting film and the quarter wave plate.

4. The single-source virtual reality display system according to claim 2 or 3, characterized in that: The at least one lens includes a compensation lens disposed on a side of the reflective polarizer close to a human eye.

5. The single-source virtual reality display system according to claim 2, wherein: The total optical length of the first eyepiece and the second eyepiece is between 10 and 20 mm, the distance from the plane of the first eyepiece facing the image source to the beam splitter is between 10 and 20 mm, and the distance from the plane of the second eyepiece facing the image source to the reflector is between 10 and 20 mm.

6. The single-source virtual reality display system according to claim 1, characterized in that: The transmittance-reflection ratio of the beam splitter is between 1.2 and 2.

5.

7. The single-source virtual reality display system according to claim 1, wherein: The distance from the image source to the beam splitter is equal to the distance from the real image to the reflector.

8. The single-source virtual reality display system according to claim 1, wherein: The field lens is arranged on a conjugate plane of the image source with respect to the beam splitter, the object plane and the principal plane of the field lens coincide with each other, and the magnification of the field lens is 1, forming an upright and equal-sized real image; the distance from the field lens to the beam splitter is greater than the distance from the field lens to the reflector.

9. The single-source virtual reality display system according to claim 1, wherein: The beam splitter and the reflector are parallel, and the angle between the normal line of the beam splitter and the normal line of the reflector and the main light of the image source is between 44° and 46°.

10. The single-source virtual reality display system according to claim 1, wherein: The image source is realized by a display screen and a polarization optical element. The polarization optical element is arranged on the light exit surface of the display screen to provide polarized light.

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