Stray light control method of optical system and near-eye display device

Abstract

The application discloses a stray light control method of an optical system and a near-eye display device, and relates to the technical field of optics. The current position of an image source and / or the current position of a reflection component are acquired; the image source is translated away from the image side from the current position of the image source, and / or the reflection component is translated away from the image source from the current position of the reflection component, and / or a preset region of the edge of the reflection component is subjected to non-reflective processing to obtain a target optical system; and finally, the stray light is controlled by using the target optical system. In the method, the image source or the reflection component is translated away from the other party, the propagation path of the stray light is changed, the stray light deviates from the effective imaging light path, and the crosstalk is reduced; meanwhile, the edge of the reflection component is subjected to non-reflective processing, and the stray light can be directly absorbed; and in addition, the light path offset and the edge extinction are combined, the stray light is double-inhibited from the source and the propagation path on the premise of not affecting normal imaging, and the near-eye display effect is significantly improved.

Description

Technical Field

[0001] This invention relates to the field of optical technology, and in particular to a stray light control method for an optical system and a near-eye display device. Background Technology

[0002] Augmented Reality (AR) technology is a technique that overlays and merges virtual scenes or information with the real physical environment, presenting them interactively to the user, thereby creating a space where the virtual and real worlds share the same space. To facilitate overall industrial design and reduce the thickness of the temples, existing near-eye display systems typically use mirrors or prisms to redirect the light path. However, this introduces mirrored stray light when the display screen is placed parallel to the temple direction. Figure 1 This is a schematic diagram of the stray light path of an eyepiece system provided by the present invention; Figure 2 This is a schematic diagram of the stray light path of another eyepiece system provided by the present invention. Figure 1 and Figure 2 In this system, the eyepiece system includes a first lens 1, a second lens 2, and a third lens 3 arranged coaxially, a reflective assembly 4, and an image source 5. The light beam emitted from the image source 5 is deflected 90° by the reflective assembly 4; then it exits in parallel through the third lens 3, the second lens 2, and the first lens 1. The reflective assembly 4 includes a first surface 41, a second surface 42, and a third surface 43. Figure 1 In the process, the stray light path is that the light beam emitted by the image source 5 passes through the first surface 41 of the reflective component 4, undergoes Fresnel reflection on the first surface 41, is reflected by the second surface 42, and then returns to the first surface 41 to enter other lenses. Figure 2 In this model, stray light originates from image source 5, is reflected by the second surface 42 of reflective component 4 to the third surface 43, undergoes total internal reflection at the third surface 43, and then flows back to the first surface 41 before entering other lenses. The presence of stray light affects the user's immersion and viewing experience; therefore, stray light elimination is a crucial aspect of AR.

[0003] Therefore, how to reduce stray light entering the optical system is a technical problem that urgently needs to be solved by those in the field. Summary of the Invention

[0004] The purpose of this invention is to provide a stray light control method for an optical system and a near-eye display device for reducing stray light entering the optical system.

[0005] To address the aforementioned technical problems, this invention provides a method for controlling stray light in an optical system. The optical system includes a reflecting component and an imaging mirror group sequentially placed along a light beam emitted from an image source. The light exit surface of the reflecting component and the light incident surface of the imaging mirror group are in contact with each other. Get the current position of the image source and / or the current position of the reflection component; Starting from the current position of the image source, the image source is translated along the side away from the image side, and / or starting from the current position of the reflective component, the reflective component is translated along the direction away from the image source, and / or the edge preset area of ​​the reflective component is processed to be non-reflective, so as to obtain the target optical system; Stray light is controlled using the target optical system.

[0006] For example, the current position is the coaxial position of the image source, the reflective component, and the imaging lens group; the reflective component includes a first surface, a second surface, and a third surface, the third surface being the light incident surface of the reflective component, and the first surface being the light emitting surface of the reflective component.

[0007] For example, translating the image source from its current position along the side away from the image side includes: Starting from the current position of the image source, the image source is translated a first preset distance along the side away from the image side; wherein, the lower limit of the first preset distance is determined by the focal length of the optical system and the length of the third surface, and the upper limit of the first preset distance is determined by the emission angle of the image source, the length of the image source, and the distance between the image source and the third surface of the reflective component.

[0008] For example, the expression satisfied by the first preset distance d1 is: 0.5 ((f- -4)≤d1≤ -pl tan(a); Where f represents the focal length of the optical system. p represents the length of the third surface, l represents the length of the image source, l represents the distance between the image source and the third surface of the reflective component, and a represents the emission angle of the image source.

[0009] For example, translating the reflective component away from the image source from its current position includes: Starting from the current position of the image source, the reflective component is translated a second preset distance in a direction away from the image source; wherein, the lower limit of the second preset distance is determined by the focal length of the optical system and the length of the first surface, and the upper limit of the second preset distance is determined by the length of the first surface and the length of the light incident surface of the imaging lens group.

[0010] For example, the expression satisfied by the second preset distance d2 is: 0.5 ((f- -4)≤d2≤ / 2- / 2-1; Where f represents the focal length of the optical system. Indicates the length of the first surface. This indicates the length of the light incident surface of the imaging lens group.

[0011] For example, performing non-reflective processing on a predetermined edge region of the reflective component includes: The edge preset area of ​​the reflective component is cut or coated with a light-absorbing layer; the edge preset area includes a first edge preset area composed of the first surface and the second surface, and / or a second edge preset area composed of the second surface and the second surface.

[0012] For example, after the edge preset area of ​​the reflective component is dereflected, the image source is translated a third preset distance from the current position of the image source along the side away from the image side; Alternatively, after performing non-reflective processing on the edge preset area of ​​the reflective component, the reflective component is translated a fourth preset distance from the current position of the image source along a direction away from the image source; The expression that the third preset distance d3 satisfies is: 0.5 ((f- )-4)-max(La,Lb)≤d3≤ -pl tan(a); The expression that the fourth preset distance d4 satisfies is: 0.5 ((f- )-4)-max(La,Lb)≤d4≤ / 2- / 2-1; Where f represents the focal length of the optical system. p represents the length of the third surface, l represents the length of the image source, l represents the distance between the image source and the third surface of the reflective component, and a represents the emission angle of the image source. Indicates the length of the first surface. The length of the light incident surface of the imaging lens group is represented by La, the length of the first edge preset region is represented by Lb, and the length of the second edge preset region is represented by Lb.

[0013] For example, the length of the first edge preset region satisfies the expression: La≤tan(90°-θ) ; Lb≤tan(90°-θ) ; Where θ represents the reflection angle of stray light.

[0014] To address the aforementioned technical problems, the present invention also provides a near-eye display device employing a stray light control method for an optical system as described above.

[0015] The stray light control method for an optical system provided by this invention includes a reflective component and an imaging mirror group sequentially placed along a light beam emitted from an image source, with the light exit surface of the reflective component and the light incident surface of the imaging mirror group being attached. The method includes obtaining the current position of the image source and / or the current position of the reflective component; translating the image source away from the image side from its current position, and / or translating the reflective component away from its current position from its current position, and / or performing dereflection processing on a predetermined edge region of the reflective component to obtain a target optical system; and finally using the target optical system to control stray light. In this method, by first obtaining the current positions of the image source and the reflective component, the accuracy of subsequent translation adjustments can be guaranteed; by translating the image source or the reflective component away from each other, the propagation path of stray light can be changed, causing it to deviate from the effective imaging optical path and reducing crosstalk; at the same time, the edge of the reflective component is treated to be non-reflective, which can directly absorb stray light and avoid it from causing interference; moreover, the combination of optical path offset and edge extinction can suppress stray light from both the source and the propagation path without affecting normal imaging, thus significantly improving the image clarity of near-eye display.

[0016] In addition, the present invention also provides a near-eye display device that employs the stray light control method of the optical system described above, which has the same or corresponding technical features as the stray light control method of the optical system mentioned above, and has the same effect. Attached Figure Description

[0017] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the stray light path of an eyepiece system provided by the present invention; Figure 2 This is a schematic diagram of the stray light path of another eyepiece system provided by the present invention; Figure 3A schematic diagram of a stray light control method for an optical system provided in an embodiment of the present invention; Figure 4 for Figure 1 The diagram shows the stray light path of the eyepiece system after the image source is translated. Figure 5 for Figure 2 The diagram shows the stray light path of the eyepiece system after the image source is translated. Figure 6 for Figure 1 The diagram shows the stray light path of the eyepiece system after the reflective component has been translated. Figure 7 for Figure 2 The diagram shows the stray light path of the eyepiece system after the reflective component has been translated. Figure 8 for Figure 1 and Figure 2 The diagram shows the stray light path of the eyepiece system after dereflection processing.

[0019] The attached figures are labeled as follows: 1-First lens; 2-Second lens; 3-Third lens; 4-Reflective component; 5-Image source; 41-First surface; 42-Second surface; 43-Third surface; 31-Light incident surface of imaging lens group. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present invention.

[0021] The core of this invention is to provide a stray light control method for an optical system and a near-eye display device, for reducing stray light entering the optical system.

[0022] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Figure 1 and Figure 2 As shown, the optical system provided by the present invention includes a reflective component 4 and an imaging lens group sequentially placed along the light beam emitted from the image source 5. The imaging lens group is as follows: Figure 1 or Figure 2The image source 5 comprises a first lens 1, a second lens 2, and a third lens 3. The image source 5 can be a liquid crystal display (LCD), an organic light-emitting diode (OLED), a liquid crystal on silicon (LCoS), a digital micromirror device (DMD), or a micro light-emitting diode (Micro-LED). The reflective component 4 can be a triangular prism, a square prism, a pentagonal prism, or a polygonal prism, or it can be a mirror. In some embodiments, the image source 5 may be an OLED, and the reflective component 4 may be a prism.

[0023] The reflecting component 4 includes a first surface 41, a second surface 42, and a third surface 43. The third surface 43 is the light incident surface of the reflecting component 4, and the first surface 41 is the light exiting surface of the reflecting component 4. The light exiting surface of the reflecting component 4 (i.e., the first surface 41 of the reflecting component 4) and the light incident surface 31 of the imaging lens group (i.e., the surface of the third lens 3 closest to the first surface 41 of the reflecting component 4) are fitted together, thereby saving space in the length direction and reducing the volume of the optical system. Generally, the image source 5, the reflecting component 4, and the imaging lens group are coaxial.

[0024] Figure 3 A schematic diagram of a stray light control method for an optical system provided in an embodiment of the present invention is shown below. Figure 3 As shown, the method includes: S10: Obtain the current position of the image source and / or the current position of the reflection component; S11: Starting from the current position of the image source, translate the image source along the side away from the image, and / or starting from the current position of the reflective component, translate the reflective component along the direction away from the image source, and / or perform non-reflective processing on the preset edge area of ​​the reflective component to obtain the target optical system. S12: Use the target optical system to control stray light.

[0025] Normally, the image source 5, the reflector 4, and the imaging lens group are coaxial. Before the movement, the current position of the image source 5 and / or the current position of the reflector 4 are the coaxial positions of the image source 5, the reflector 4, and the imaging lens group.

[0026] In order to eliminate stray light, in this invention, starting from the current position of the image source 5, the image source 5 is translated along the side away from the image side, and / or starting from the current position of the reflection component 4, the reflection component 4 is translated along the direction away from the image source 5, and / or the edge preset area of ​​the reflection component 4 is subjected to non-reflective processing to obtain the target optical system, through which stray light can be suppressed.

[0027] In one possible implementation, the current position is the coaxial position of the image source 5, the reflective component 4, and the imaging lens group.

[0028] By using the coaxial position of image source 5, reflection component 4, and imaging lens group as the initial reference, the positions of image source 5 and reflection component 4 are translated and adjusted. This allows for precise control of the offset without disrupting the basic imaging structure of the main optical path. Simultaneously, a small offset from the coaxial position can deflect stray light away from the effective imaging optical path, achieving the effect of suppressing stray light without introducing significant aberrations, ensuring that normal imaging quality is not affected. Furthermore, this initial position is clearly defined and easy to adjust, which is beneficial for achieving unified calibration and batch consistency control during production and assembly.

[0029] The following explains how to reduce stray light by translating image source 5. Figure 4 for Figure 1 The diagram shows the stray light path of the eyepiece system after the image source is shifted. Figure 5 for Figure 2 The diagram shows the stray light path of the eyepiece system after the image source is shifted.

[0030] Starting from the current position of image source 5, translating image source 5 along the side away from the image side includes: Starting from the current position of image source 5, image source 5 is translated a first preset distance along the side away from the image side; wherein, the lower limit of the first preset distance is determined by the focal length of the optical system and the length of the third surface 43, and the upper limit of the first preset distance is determined by the emission angle of image source 5, the length of image source 5, and the distance between image source 5 and the third surface 43 of reflective component 4.

[0031] When moving image source 5, it is essential to ensure that all light beams emitted by image source 5 are received by reflective component 4; otherwise, the uniformity of the emitted light will be affected. Therefore, the expression satisfied by the first preset distance d1 is: 0.5 ((f- -4)≤d1≤ -pl tan(a); Where f represents the focal length of the optical system. p represents the length of the third surface 43, l represents the length of the image source 5, l represents the distance between the image source 5 and the third surface 43 of the reflective component 4, and a represents the emission angle of the image source 5.

[0032] Figure 4 and Figure 5 In the middle, image source 5 is moved along the side away from the image side, that is, image source 5 is moved to the right. Figure 4 and Figure 5 Image source 5, represented by a dashed line, is the image source 5 after it has been moved. The solid arrow indicates the stray light path before image source 5 was moved; the dashed arrow indicates the stray light path after image source 5 was moved. Comparing the stray light paths before and after image source 5 was moved, it can be seen that after image source 5 was moved, the stray light did not enter the third lens 3 and was completely absorbed by the lens barrel, reducing the stray light entering the imaging lens group.

[0033] The above describes reducing stray light by translating the image source 5. In this embodiment, the position of the image source 5 is kept unchanged, and the stray light is reduced by translating the reflection component 4. Figure 6 for Figure 1 The diagram shows the stray light path of the eyepiece system after the reflective component has been translated. Figure 7 for Figure 2 The diagram shows the stray light path of the eyepiece system after the reflective component has been translated.

[0034] Starting from the current position of the reflective component 4, translating the reflective component 4 in a direction away from the image source 5 includes: Starting from the current position of image source 5, the reflective component 4 is translated a second preset distance in a direction away from image source 5; wherein, the lower limit of the second preset distance is determined by the focal length of the optical system and the length of the first surface 41, and the upper limit of the second preset distance is determined by the length of the first surface 41 and the length of the light incident surface 31 of the imaging lens group.

[0035] To ensure that all reflected light beams are received by the light incident surface 31 of the imaging mirror group, the second preset distance d2 satisfies the following expression: 0.5 ((f- -4)≤d2≤ / 2- / 2-1; Where f represents the focal length of the optical system. This indicates the length of the first surface 41. This indicates the length of the light incident surface 31 of the imaging lens group.

[0036] Figure 6 and Figure 7In the middle, the reflective component 4 is moved in a direction away from the image source 5, that is, the reflective component 4 is moved upward. Figure 6 and Figure 7 The dashed line representing reflective component 4 indicates the moved reflective component 4. The solid arrow indicates the stray light path before moving reflective component 4; the dashed arrow indicates the stray light path after moving reflective component 4. Comparing the stray light paths before and after moving reflective component 4, it can be seen that after moving reflective component 4, the stray light does not enter the third lens 3 and is completely absorbed by the lens barrel, reducing the stray light entering the imaging lens group.

[0037] The above describes methods to reduce stray light by translating the image source 5 and by translating the reflective component 4 while keeping the image source 5 in the same position. In addition to these methods, in one possible implementation, stray light can be reduced by dereflecting a predetermined area at the edge of the reflective component 4.

[0038] The non-reflective processing of the preset edge area of ​​the reflective component 4 includes: The edge preset area of ​​the reflective component 4 is cut or coated with a light-absorbing layer; the edge preset area includes a first edge preset area composed of a first surface 41 and a second surface 42, and / or a second edge preset area composed of a second surface 42 and a second surface 42.

[0039] Apply a light-absorbing layer, such as ink. Figure 8 for Figure 1 and Figure 2 The diagram shows the stray light path of the eyepiece system after dereflection treatment. The pre-defined area at the edge of the cut or coated light-absorbing layer is shown. Figure 8 Regions A and B are defined in the diagram. Region A is the first preset edge region, and region B is the second preset edge region. It is worth noting that the light-absorbing layer can be cut or coated within either region A or region B.

[0040] After the edge preset area of ​​the reflective component 4 is processed to be non-reflective, the image source 5 is translated a third preset distance from the current position of the image source 5 along the side away from the image side. Alternatively, after performing non-reflective processing on the edge preset area of ​​the reflective component 4, starting from the current position of the image source 5, the reflective component 4 is translated a fourth preset distance in a direction away from the image source 5. The expression that the third preset distance d3 satisfies is: 0.5 ((f- )-4)-max(La,Lb)≤d3≤ -pl tan(a); The expression that the fourth preset distance d4 satisfies is: 0.5 ((f- )-4)-max(La,Lb)≤d4≤ / 2- / 2-1; Where f represents the focal length of the optical system. p represents the length of the third surface 43, l represents the length of the image source 5, l represents the distance between the image source 5 and the third surface 43 of the reflective component 4, and a represents the emission angle of the image source 5. This indicates the length of the first surface 41. The length of the light incident surface 31 of the imaging lens group is represented by La, the length of the first edge preset region is represented by Lb, and the length of the second edge preset region is represented by Lb.

[0041] The expression that the length of the first edge preset region satisfies is: La≤tan(90°-θ) ; Lb≤tan(90°-θ) ; Where θ represents the reflection angle of stray light.

[0042] pass Figure 8 It can be observed that by cutting or coating the edge of the light-absorbing layer in a predetermined area, stray light does not enter the third lens 3 and is completely absorbed by the lens barrel, thus reducing the stray light entering the imaging lens group.

[0043] Furthermore, it should be noted that if La and Lb can completely cover stray light, then the translation distance of the reflective component 4 or the image source 5 can be 0, that is, no translation is required.

[0044] In the stray light control method of the optical system provided by the present invention, the optical system includes a reflective component 4 and an imaging mirror group placed sequentially along the light beam emitted from an image source 5, wherein the light emitting surface of the reflective component 4 and the light incident surface 31 of the imaging mirror group are in contact. The method includes obtaining the current position of the image source 5 and / or the current position of the reflective component 4; translating the image source 5 away from the image side from the current position of the image source 5, and / or translating the reflective component 4 away from the image source 5 from the current position of the reflective component 4, and / or performing non-reflective processing on a preset edge region of the reflective component 4 to obtain a target optical system; and finally using the target optical system to control stray light. In this method, by first obtaining the current positions of the image source 5 and the reflective component 4, the accuracy of subsequent translation adjustments can be guaranteed. By translating the image source 5 or the reflective component 4 away from each other, the propagation path of stray light can be changed, causing it to deviate from the effective imaging optical path and reducing crosstalk. At the same time, the edge of the reflective component 4 is treated to be non-reflective, which can directly absorb stray light and avoid it from causing interference. Moreover, the combination of optical path offset and edge extinction can suppress stray light from both the source and the propagation path without affecting normal imaging, thus significantly improving the image clarity of near-eye display.

[0045] The above description outlines a method for controlling stray light in an optical system. This embodiment also provides a near-eye display device. This near-eye display device employs the aforementioned method for controlling stray light in an optical system. The method for controlling stray light in an optical system has been described in detail above, and will not be repeated here for the near-eye display device embodiment, which possesses the same beneficial effects as the aforementioned method for controlling stray light in an optical system.

[0046] The foregoing has provided a detailed description of the stray light control method for the optical system and the near-eye display device provided by this invention. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of this invention.

[0047] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for controlling stray light in an optical system, the optical system comprising a reflective component and an imaging mirror group sequentially placed along a light beam emitted from an image source, wherein the light exit surface of the reflective component and the light incident surface of the imaging mirror group are in contact, characterized in that, include: Get the current position of the image source and / or the current position of the reflection component; Starting from the current position of the image source, the image source is translated along the side away from the image side, and / or starting from the current position of the reflective component, the reflective component is translated along the direction away from the image source, and / or the edge preset area of ​​the reflective component is processed to be non-reflective, so as to obtain the target optical system; Stray light is controlled using the target optical system.

2. The stray light control method for an optical system according to claim 1, characterized in that, The current position is the coaxial position of the image source, the reflective component, and the imaging lens group; the reflective component includes a first surface, a second surface, and a third surface, the third surface being the light incident surface of the reflective component, and the first surface being the light exiting surface of the reflective component.

3. The stray light control method for an optical system according to claim 2, characterized in that, The step of translating the image source from its current position along the side away from the image side includes: Starting from the current position of the image source, the image source is translated a first preset distance along the side away from the image side; wherein, the lower limit of the first preset distance is determined by the focal length of the optical system and the length of the third surface, and the upper limit of the first preset distance is determined by the emission angle of the image source, the length of the image source, and the distance between the image source and the third surface of the reflective component.

4. The stray light control method for an optical system according to claim 3, characterized in that, The expression that the first preset distance d1 satisfies is: 0.5 ((f- )−4)≤d1≤ -pl tan(a); Where f represents the focal length of the optical system. p represents the length of the third surface, l represents the length of the image source, l represents the distance between the image source and the third surface of the reflective component, and a represents the emission angle of the image source.

5. The stray light control method for an optical system according to claim 2, characterized in that, Starting from the current position of the reflective component, translating the reflective component away from the image source includes: Starting from the current position of the image source, the reflective component is translated a second preset distance in a direction away from the image source; wherein, the lower limit of the second preset distance is determined by the focal length of the optical system and the length of the first surface, and the upper limit of the second preset distance is determined by the length of the first surface and the length of the light incident surface of the imaging lens group.

6. The stray light control method for an optical system according to claim 5, characterized in that, The expression that the second preset distance d2 satisfies is: 0.5 ((f- )-4)≤d2≤ / 2- / 2-1; Where f represents the focal length of the optical system. Indicates the length of the first surface. This indicates the length of the light incident surface of the imaging lens group.

7. The stray light control method for an optical system according to claim 2, characterized in that, The non-reflective processing of the preset edge region of the reflective component includes: The edge preset area of ​​the reflective component is cut or coated with a light-absorbing layer; the edge preset area includes a first edge preset area composed of the first surface and the second surface, and / or a second edge preset area composed of the second surface and the second surface.

8. The stray light control method for an optical system according to claim 7, characterized in that, After the edge preset area of ​​the reflective component is dereflected, the image source is translated a third preset distance from the current position of the image source along the side away from the image side. Alternatively, after performing non-reflective processing on the edge preset area of ​​the reflective component, the reflective component is translated a fourth preset distance from the current position of the image source along a direction away from the image source; The expression that the third preset distance d3 satisfies is: 0.5 ((f- )-4)-max(La,Lb)≤d3≤ -p-l tan(a); The expression that the fourth preset distance d4 satisfies is: 0.5 ((f- )-4)-max(La,Lb)≤d4≤ / 2- / 2-1; Where f represents the focal length of the optical system. p represents the length of the third surface, l represents the length of the image source, l represents the distance between the image source and the third surface of the reflective component, and a represents the emission angle of the image source. Indicates the length of the first surface. The length of the light incident surface of the imaging lens group is represented by La, the length of the first edge preset region is represented by Lb, and the length of the second edge preset region is represented by Lb.

9. The stray light control method for an optical system according to claim 8, characterized in that, The length of the first edge preset region satisfies the following expression: La ≤ tan (90°-θ) ; Lb≤tan(90°-θ) ; Where θ represents the reflection angle of stray light.

10. A near-eye display device, characterized in that, The stray light control method of the optical system as described in any one of claims 1 to 9 is adopted.

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