Large-field-angle near-to-eye display optical module

Abstract

The invention discloses a large-field-angle near-to-eye display optical module. The large-field-angle near-to-eye display optical module comprises a coupling-in light machine, a one-dimensional waveguide and an OLED (Organic Light Emitting Diode), a coupling light machine is arranged at the emergent light position of the OLED, and a one-dimensional waveguide is arranged at the emergent light position of the coupling light machine; the coupling light machine comprises a prism, a first lens and a second lens; one surface, located at the emergent light of the OLED, of the prism is defined as a first surface, one surface, coupled into the emergent light of the light machine, of the prism is defined as a second surface, and the first surface is adjacent to the second surface; the other face adjacent to the second face is defined as a third face, the other face adjacent to the first face is defined as a fourth face, a first lens is arranged on the third face, and the face, away from the prism, of the first lens is a first reflector; and one surface, far away from the prism, of the second lens is a second reflecting mirror. According to the invention, only one prism and two lenses are used for coupling the light machine, the size is greatly compressed by using a folded light path, and the effects of small size, large field angle and large exit pupil distance are achieved.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, and in particular, to a large field of view near-eye display optical module. Background Art

[0002] With the continuous iteration of display technology, augmented reality (AR) technology has gradually become a hot topic of concern. AR projects virtual images into the real world, enabling users to obtain a richer interactive experience. Comfort and immersion are important indicators for near-eye displays, which pose higher requirements for the size, field of view angle, imaging effect, etc. of the device. Currently, there are various optical solutions for AR. Among them, the one-dimensional pupil expansion waveguide solution has become one of the mainstream solutions due to its advantages such as being thin and light, having a high ambient light transmittance, and a relatively high light efficiency (about 8%). The one-dimensional pupil expansion waveguide solution consists of a micro-display device, an optical coupling mechanism, and a waveguide. Among micro-display devices, silicon-based OLED is one of the necessary light-emitting devices due to its high contrast and low power consumption. As an imaging and magnifying device, the optical coupling mechanism plays the role of converting the light source emitted by the OLED into parallel light and determines the size of the field of view angle. Existing technologies mostly use a combination of multiple lenses to achieve this, and generally, the field of view angle is relatively small, with a range basically between 15° and 45°.

[0003] Conventional solutions use a combination of multiple lenses as the optical coupling mechanism, but it is difficult to solve the contradiction between small size and large field of view angle. For example, Chinese Patent No. CN117849912A discloses a large field of view folding optical system, including a 4-time folding optical system and a 2-time folding optical system; the 4-time folding optical system and the 2-time folding optical system include a first metasurface, a second metasurface, and a third metasurface; in the 4-time folding optical system, the first metasurface, the second metasurface, and the third metasurface are coaxially arranged on the same substrate; in the 2-time folding optical system, the first metasurface and the third metasurface are coaxially arranged on the same substrate, and the second metasurface is coaxially arranged in front of the third metasurface. In this patent, the field of view angle is greater than or equal to 40°.

[0004] In the prior art, a polarization beam splitter prism solution (PBS), a coaxial folding solution (pancake), an off-axis folding solution, etc. are also used to significantly reduce the size of the optical engine. For example, Chinese Patent No. CN118393735A discloses an optical engine system and a near-eye display device that uses PBS; PCT International Patent No. WO2023207581A1 discloses an optical polarization device and its manufacturing method, a near-eye display device that uses the pancake solution. However, both the PBS and pancake solutions will lose more than half of the light efficiency. The off-axis folding solution has a smaller light efficiency loss and is more suitable for matching a silicon-based OLED screen, but the off-axis folding solution has a serious problem of stray light. Summary of the Invention

[0005] Technical objective: Aiming at the defects in the prior art, the present invention discloses a near-eye display optical module with a large field of view, realizing a one-dimensional pupil-expanding waveguide module solution with a large field of view, small size, less stray light, high brightness, and high brightness uniformity.

[0006] Technical solution: To achieve the above technical objective, the present invention adopts the following technical solutions.

[0007] A near-eye display optical module with a large field of view includes an input optical engine, a one-dimensional waveguide, and an OLED; an input optical engine is arranged at the light-emitting position of the OLED, and a one-dimensional waveguide is arranged at the light-emitting position of the input optical engine; The input optical engine includes a prism, a first lens, and a second lens; define the surface of the prism located at the light-emitting position of the OLED as the first surface, and the surface at the light-emitting position of the input optical engine as the second surface, and the first surface is adjacent to the second surface; define the other surface adjacent to the second surface as the third surface, and the other surface adjacent to the first surface as the fourth surface. A first lens is arranged on the third surface, and the surface of the first lens away from the prism is a first reflector; a second lens is arranged on the fourth surface, and the surface of the second lens away from the prism is a second reflector. Among them, the input optical engine satisfies: , where is the radius of curvature of the first reflector in the pupil-expanding direction, is the radius of curvature of the second reflector in the pupil-expanding direction, is the radius of curvature of the first reflector in the non-pupil-expanding direction, is the radius of curvature of the second reflector in the non-pupil-expanding direction.

[0008] Beneficial effects: (1) For the near-eye display optical module with a large field of view proposed by the present invention, the input optical engine only uses one prism plus two lenses, and uses the folded optical path to greatly compress the size, achieving the effect of combining small size, large field of view, and large exit pupil distance. The size of the optical engine does not exceed 42mm×27mm×25mm, and the field of view angle ≥ 50°; (2) By adding a microlens to the OLED in the present invention, the divergence angle of the light source emission is reduced, so that when the divergence angle β of the light emitted by the OLED > 40, the light intensity is lower than 10%, thereby reducing stray light and at the same time increasing the emission intensity and improving the eye-in brightness; (3) Through the microlens offset in the present invention, the maximum emission angle at the corresponding position of the OLED is made consistent or not much different from the chief ray angle of the optical module composed of the one-dimensional waveguide and the input optical engine, realizing the improvement of brightness uniformity. Description of the drawings

[0009] Figure 1 is a schematic diagram of a near-eye display optical module with a large field of view according to an embodiment of the present invention Figure 1 ; Figure 2 Schematic diagram of a large field of view near-eye display optical module according to an embodiment of the present invention Figure 2 ; Figure 3 Schematic diagram showing that the light emitted by the OLED has a large divergence angle and there is obvious stray light; Figure 4 Schematic diagram of the stray light optical path; Figure 5 Schematic diagram showing that the light emitted by the OLED has a small divergence angle and the brightness is significantly uneven; Figure 6 Schematic diagram of introducing a microlens and its offset in the OLED; Figure 7 CRA schematic diagram of the optical module; Figure 8 Schematic diagram of the effect after using the microlens for light concentration and offset; Among them, 1 is the light-coupling optical engine, 11 is the prism, 2 is the one-dimensional waveguide, 3 is the OLED; 41 is the first lens, 42 is the second lens, 51 is the first mirror, and 52 is the second mirror. Specific implementation mode

[0010] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0011] Embodiment As shown in the attached Figure 1 figure, a large field of view near-eye display optical module in this embodiment includes a light-coupling optical engine 1, a one-dimensional waveguide 2, and an OLED 3; a light-coupling optical engine 1 is arranged at the light-emitting position of the OLED 3, and a one-dimensional waveguide 2 is arranged at the light-emitting position of the light-coupling optical engine 1; The light-coupling optical engine 1 includes a prism 11, a first lens 41, and a second lens 42; the surface of the prism 11 located at the light-emitting position of the OLED 3 is defined as the first surface, and the surface of the light-coupling optical engine 1 at the light-emitting position is defined as the second surface, and the first surface and the second surface are adjacent; the other surface adjacent to the second surface is defined as the third surface, and the other surface adjacent to the first surface is defined as the fourth surface. The first lens 41 is arranged on the third surface, and the surface of the first lens 41 away from the prism 11 is the first mirror 51; the second lens 42 is arranged on the fourth surface, and the surface of the second lens 42 away from the prism 11 is the second mirror 52; In this embodiment, the optical path of the optical module is as follows: After the light emitted by the OLED 3 enters the first surface of the prism 11, it first enters the first lens 41 on the third surface, and then is reflected by the first mirror 51 and returns to the first lens 41, refracts into the prism 11, and then enters the second lens 42 on the fourth surface. After being reflected by the second mirror 52, it returns to the second lens 42 and enters the prism 11 again. After the light exits from the second surface of the prism 11, it is coupled into the one-dimensional waveguide 2 and propagates in the one-dimensional waveguide 2 through total internal reflection until it exits the one-dimensional waveguide 2 and enters the human eye.

[0012] The third surface and the fourth surface of the prism may be adjacent or not. When the third surface and the fourth surface are adjacent, the prism 11 is a quadrangular prism, as shown in the appendix Figure 2 ; when the third surface and the fourth surface are not adjacent, the prism 11 has one more surface, that is, the prism 11 is a pentagonal prism, as shown in the appendix Figure 1 ; that is to say, the prism can be divided into a pentagonal prism or a quadrangular prism according to whether the right top angle is cut.

[0013] The refractive index n5 of the material of the prism 11 is > 1.8, , is the included angle between the first surface and the second surface of the prism 11.

[0014] The light-coupling optical machine 1 satisfies: the size range of the light-coupling optical machine 1 is from 36mm × 18mm × 18mm to 42mm × 27mm × 25mm. The non-pupil-expanding direction diaphragm is located at the human eye, and the pupil-expanding direction diaphragm is located at the coupling plane of the one-dimensional waveguide 2. The distance requirement between the two diaphragms is: ; In the one-dimensional waveguide 2, it satisfies: , where L is the distance between the two diaphragms of the light-coupling optical machine 1, , ER is the distance from the human eye to the near-eye side of the one-dimensional waveguide 2, d is the thickness of the one-dimensional waveguide 2, is the distance from the eye box center of the one-dimensional waveguide 2 to the coupling center of the one-dimensional waveguide 2, VEB is the eye box size of the one-dimensional waveguide 2 in the pupil-expanding direction, which is a numerical value, is the included angle between the output reflecting surface of the one-dimensional waveguide 2 and the plane of the one-dimensional waveguide 2, and n is the refractive index of the material of the one-dimensional waveguide 2.

[0015] The maximum chief ray angle in the non-pupil-expanding direction of the light-coupling optical machine 1 satisfies: , and , where L is the distance between the two diaphragms of the light-coupling optical machine 1, f is the focal length of the light-coupling optical machine 1, and FOV is the diagonal field of view angle of the light-coupling optical machine 1.

[0016] In this embodiment, the light-coupling optical engine only uses one prism and two lenses, and significantly compresses the size by using a folded optical path, achieving the effects of small size, large field of view angle, and large exit pupil distance. The field of view angle is ≥50°, and the size does not exceed 42mm×27mm×25mm.

[0017] The light-coupling optical engine 1 also needs to satisfy , where is the radius of curvature of the first mirror 51 in the pupil-expanding direction, is the radius of curvature of the second mirror 52 in the pupil-expanding direction, is the radius of curvature of the first mirror 51 in the non-pupil-expanding direction, is the radius of curvature of the second mirror 52 in the non-pupil-expanding direction.

[0018] The material of the first lens 41 is a transparent optical plastic material. One side of the first lens 41 is a plane coated with an anti-reflection film, which is glued to the prism, and the other side is a free-form surface coated with an internal total reflection film, that is, used as the first mirror 51. The formula expression of the first lens 41 is: , where is the z coefficient of the first lens 41, is the curvature of the first lens 41 in the X direction, is the curvature of the first lens 41 in the Y direction, is the conic coefficient of the first lens 41 in the X direction, is the conic coefficient of the first lens 41 in the Y direction, is the high-order term coefficient of the first lens 41 in the X direction, is the high-order term coefficient of the first lens 41 in the Y direction, represents the th power of x, represents the th power of y, is the number of high-order terms. In this embodiment, the value is 4 or 5.

[0019] The material of the second lens 42 is a transparent optical plastic material. One side of the second lens 42 is a plane coated with an anti-reflection film, which is glued to the prism, and the other side is a free-form surface coated with an internal total reflection film, that is, used as the second mirror 52. The formula expression of the second lens 42 is: , where is the z coefficient of the second lens 42, is the curvature of the second lens 42 in the X direction, is the curvature of the second lens 42 in the Y direction, is the conic coefficient of the second lens 42 in the X direction, is the conical coefficient of the second lens 42 in the Y direction, is the higher-order term coefficient of the second lens 42 in the X direction, is the higher-order term coefficient of the second lens 42 in the Y direction, represents the power of x, and is the number of higher-order terms, which takes a value of 4 or 5 in this embodiment.

[0020] When the divergence angle of the light emitted by the OLED is large, i.e., the divergence angle β > 40 and the light intensity is higher than 10%, the light with a large divergence angle is incident on the inner wall of the prism and undergoes total internal reflection, generating stray light, which seriously affects the viewing effect, as shown in the appendix Figure 3 . The optical path diagram of the stray light entering the optical module is as shown in the appendix Figure 4 . By analyzing the optical path of the stray light, it is found that the light with a large divergence angle emitted by the OLED is incident on the plane where the one-dimensional waveguide of the prism is located, i.e., the second surface, undergoes total internal reflection, and then enters the one-dimensional waveguide after being reflected by two reflectors and finally enters the human eye, bringing stray light.

[0021] In this embodiment, a microlens is provided in the OLED3. The microlens is disposed between the light-emitting layer and the optical transparent adhesive layer in the OLED. The main functions of the optical transparent adhesive layer are bonding, optical transparency, and moisture-proofing, and it is located in the OLED encapsulation layer. The microlens is a conventional structure in the prior art. For example, in this embodiment, an H-K9L microlens is used. It should be noted that the material and selection of the microlens are not the focus of this application and will not be elaborated here. The setting of the microlens realizes reducing the light-emitting divergence angle of the light source, so that when the divergence angle β of the light emitted by the OLED is > 40, the light intensity is lower than 10%, thereby reducing stray light and at the same time enhancing the light-emitting intensity and increasing the brightness entering the human eye. That is, narrowing the light emitted by the OLED through the microlens can be used to reduce stray light. However, when the divergence angle of the light emitted by the OLED is small, i.e., β > 40 and the light intensity is lower than 10%, the brightness of the edge field of view is severely lower than that of the central field of view, and the brightness of the edge field of view is less than 50% of that of the central field of view, resulting in uneven brightness of the entire picture and also affecting the viewing experience, as shown in the appendix Figure 5 .

[0022] As shown in the appendix Figure 6 , in this embodiment, by offsetting the microlens, the maximum emission angle at the corresponding position of the OLED3 is made consistent or not much different from the principal ray angle of the optical module composed of the one-dimensional waveguide and the light-coupling optical machine, that is, it satisfies: , wherein, is the maximum emission angle at the corresponding position of the OLED3, is the chief ray angle at any position of the optical module, achieving improved brightness uniformity with brightness uniformity ≥ 60%.

[0023] As shown in the appendix Figure 7 The numerical values of the chief ray angle (CRA) coupled into the optical engine at different positions of the optical module are also different. The central CRA of the coupled optical engine is 0, and the CRA at the edge is the largest. As is the maximum chief ray angle in the non-pupil-expanding direction of the coupled optical engine 1 and also the maximum chief ray angle in the X direction is the maximum chief ray angle in the pupil-expanding direction of the coupled optical engine and also the maximum chief ray angle in the Y direction. The change in CRA of the coupled optical engine from the center to the edge shows a linear change is the chief ray angle at any position of the optical module, and all of them need to satisfy the above relational expression

[0024] That is to say, in this embodiment, through the light condensation of the microlens, the divergence angle β of the light emitted by the OLED is > 40, and the light intensity is lower than 10%, thereby effectively improving stray light. And the brightness uniformity is controlled by the microlens offset. The final effect diagram is as shown in the appendix Figure 8 shown

[0025] That is to say, for the current AR optical module, the field of view angle is generally small, basically between 15° - 45°. The present invention discloses a one-dimensional pupil-expanding waveguide AR module solution with a field of view angle ≥ 50 degrees. Aiming at the contradiction that it is impossible to balance the large viewing angle and small volume, the present invention adopts a folding scheme, making the size of the coupled optical engine ≤ 42mm × 27mm × 25mm. Aiming at the stray light problem caused by the folding scheme, the present invention adopts the microlens light condensation and microlens offset technology to reduce stray light. At the same time, the eye-in brightness and brightness uniformity are improved

[0026] To verify the effect of the optical module of the present invention, the following simulation verification process is given Using the inverse optical path design, the field of view angles are all set to a rectangular field of view angle of 41° × 30.2°. Through image height control, to meet the diagonal field of view angle ≥ 50°. The refractive index n of the material of the one-dimensional waveguide is 1.62, and the included angle between the one-dimensional waveguide output reflection surface and the one-dimensional waveguide plane , the distance from the center of the eye box of the one-dimensional waveguide to the center of the one-dimensional waveguide input of the geometric waveguide, making the distance from the human eye to the near-eye side of the waveguide .

[0027] Simulation verification 1 Set , focal length f = 16.69mm. The parameters of each surface of the coupled optical engine are shown in Table 1, the parameters of the first reflector are shown in Table 2, and the parameters of the second reflector are shown in Table 3

[0028] Table 1 Parameter Table of Each Surface of the Light Coupling Optical Machine

[0029] Table 2 Parameter Table of the First Reflector

[0030] Table 3 Parameter Table of the Second Reflector

[0031] Calculate the following formula based on the above parameters: , , Size of the light coupling optical machine: 40mm * 24mm * 22mm n5 = 1.84 > 1.8, , That is to say, under the verification of the above parameters, through the condensation of the microlens, the divergence angle β of the light emitted by the OLED is > 40, and the light intensity is lower than 10%, thus effectively improving the stray light. And through the offset of the microlens, the maximum emission angle at the corresponding position of the screen is made consistent or not much different from the chief ray angle of the light coupling optical machine composed of the waveguide and the light coupling optical machine , achieving a high brightness uniformity ≥ 60%.

[0032] Simulation Verification 2: Set: , focal length f = 17.38mm, the parameters of each surface of the light coupling optical machine are as shown in Table 4, the parameters of the first reflector are as shown in Table 5, and the parameters of the second reflector are as shown in Table 6.

[0033] Table 4 Parameter Table of Each Surface of the Light Coupling Optical Machine

[0034] Table 5 Parameter Table of the First Reflector

[0035] Table 6 Parameter Table of the Second Reflector

[0036] Calculate the following formula based on the above parameters: , , , Size of the light coupling optical machine: 41mm * 26mm * 22mm, n5 = 1.84 > 1.8, , That is to say, under the above parameter verification, through the condensation of the microlens, the divergence angle β of the light emitted by the OLED is > 40, and the light intensity is lower than 10%, thereby effectively improving the stray light. And through the microlens offset, the maximum emission angle at the corresponding position of the screen is made consistent or approximately the same as the chief ray angle of the coupling optical machine composed of the waveguide and the coupling optical machine , achieving a high brightness uniformity ≥ 60%.

[0037] Simulation verification 3: Set: , the focal length f = 17.17 mm, the parameters of each surface of the coupling optical machine are shown in Table 7, the parameters of the first reflector are shown in Table 8, and the parameters of the second reflector are shown in Table 9.

[0038] Table 7 Parameters of each surface of the coupling optical machine

[0039] Table 8 Parameter table of the first reflector

[0040] Table 9 Parameter table of the second reflector

[0041] Calculate the following formula according to the above parameters: , , , Size of the coupling optical machine: 38 mm * 25 mm * 22 mm, n5 = 1.84 > 1.8, , That is to say, under the above parameter verification, through the condensation of the microlens, the divergence angle β of the light emitted by the OLED is > 40, and the light intensity is lower than 10%, thereby effectively improving the stray light. And through the microlens offset, the maximum emission angle at the corresponding position of the screen is made consistent or approximately the same as the chief ray angle of the coupling optical machine composed of the waveguide and the coupling optical machine , achieving a high brightness uniformity ≥ 60%.

[0042] The above simulation process verifies the effects achieved by this application. The optical module designed in this application can also be manufactured and realized, such as preparing the optical module by turning processing.

[0043] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A near-eye display optical module with a large field of view, characterized in that: It includes an optical coupler (1), a one-dimensional waveguide (2), and an OLED (3); the optical coupler (1) is arranged at the light-emitting position of the OLED (3), and the one-dimensional waveguide (2) is arranged at the light-emitting position of the optical coupler (1). The optical coupler (1) includes a prism (11), a first lens (41), and a second lens (42); define the surface of the prism (11) located at the light-emitting position of the OLED (3) as the first surface, and the surface at the light-emitting position of the optical coupler (1) as the second surface, and the first surface and the second surface are adjacent; define the other surface adjacent to the second surface as the third surface, and the other surface adjacent to the first surface as the fourth surface. The first lens (41) is arranged on the third surface, and the surface of the first lens (41) away from the prism (11) is a first reflector (51); the second lens (42) is arranged on the fourth surface, and the surface of the second lens (42) away from the prism (11) is a second reflector (52). Among them, the coupled optical machine (1) satisfies: , where is the radius of curvature of the first mirror (51) in the pupil expansion direction, is the radius of curvature of the second mirror (52) in the pupil expansion direction, is the radius of curvature of the first mirror (51) in the non-pupil expansion direction, is the radius of curvature of the second mirror (52) in the non-pupil expansion direction.

2. The large field of view near-eye display optical module according to claim 1, wherein In the one-dimensional waveguide (2), the following conditions are satisfied: , where L is the distance between the two diaphragms of the light coupling optical machine (1), , ER is the distance from the human eye to the near-eye side of the one-dimensional waveguide (2), d is the thickness of the one-dimensional waveguide (2), is the distance from the eye box center of the one-dimensional waveguide (2) to the coupling center of the one-dimensional waveguide (2), VEB is the eye box size of the one-dimensional waveguide (2) in the pupil expansion direction, is the angle between the output reflection surface of the one-dimensional waveguide (2) and the plane of the one-dimensional waveguide (2), and n is the refractive index of the material of the one-dimensional waveguide (2).

3. The large field of view near-eye display optical module according to claim 1, characterized in that: The maximum chief ray angle in the non-pupil-expanding direction coupled into the optical engine (1) satisfies: , and , where L is the distance between the two diaphragms of the optical engine (1), f is the focal length of the optical engine (1), and FOV is the diagonal field of view angle of the optical engine (1).

4. The large field of view near-eye display optical module according to claim 1, wherein: The material of the first lens (41) is a transparent optical plastic material. One surface of the first lens (41) is a plane coated with an anti-reflection film, and this plane is glued to the prism. The other surface is a free-form surface coated with an internal total reflection film, which serves as the first reflector (51).

5. The large field of view near-eye display optical module according to claim 1, characterized in that: The formula expression of the first lens (41) is: ， Among them, is the z coefficient of the first lens (41), is the curvature of the first lens (41) in the X direction, is the curvature of the first lens (41) in the Y direction, is the conic coefficient of the first lens (41) in the X direction, is the conic coefficient of the first lens (41) in the Y direction, is the high-order term coefficient of the first lens (41) in the X direction, is the high-order term coefficient of the first lens (41) in the Y direction, represents the power of x, represents the power of y, is the number of high-order terms.

6. The large field of view near-eye display optical module according to claim 1, characterized in that: The material of the second lens (42) is a transparent optical plastic material. One surface of the second lens (42) is a plane coated with an anti-reflection film, and this plane is glued to the prism. The other surface is a free-form surface coated with an internal total reflection film, which serves as the second reflector (52).

7. The large field of view near-eye display optical module according to claim 1, characterized in that: The formula expression of the second lens (42) is: ， Among them, is the z coefficient of the second lens (42), is the curvature of the second lens (42) in the X direction, is the curvature of the second lens (42) in the Y direction, is the conic coefficient of the second lens (42) in the X direction, is the conic coefficient of the second lens (42) in the Y direction, is the high-order term coefficient of the second lens (42) in the X direction, is the high-order term coefficient of the second lens (42) in the Y direction, represents the power of x, represents the power of y, is the number of high-order terms.

8. The large field of view near-eye display optical module according to claim 1, characterized in that: A microlens is provided in the OLED (3), and the microlens is arranged between the light-emitting layer and the optically transparent adhesive layer in the OLED.

9. The large field of view near-eye display optical module according to claim 8, wherein: After the microlens is offset, it satisfies: ， Among them, is the maximum emission angle corresponding to the OLED (3), and is the principal ray angle at any position of the optical module.

10. The large field of view near-eye display optical module according to claim 1, characterized in that: The third surface and the fourth surface of the prism (11) are adjacent or not adjacent.

Images