Optical system and near-to-eye display equipment

Abstract

The utility model provides an optical system and an optical waveguide. The optical system comprises a display module, a first shaping module, a polarization splitting prism, a first reflection module and a second reflection module. The light inlet side of the first shaping module is arranged on the light outlet side of the display module, the light outlet side of the first shaping module, the polarization splitting prism and the second reflection module are sequentially arranged in the first direction, the first reflection module and the polarization splitting prism are sequentially arranged in the second direction, and the first direction is not parallel to the second direction; in the optical system, after the non-polarized light beams output by the display module pass through the polarization splitting prism, the first reflection module and the second reflection module, the light beams in the first polarization state and the light beams in the second polarization state can be emitted in the second direction finally, the energy utilization efficiency of the non-polarized light can be improved, and the energy loss of the non-polarized light can be reduced.

Description

Technical Field

[0001] The embodiments of the utility model relate to the field of optical technology, and in particular to an optical system and a near-eye display device. Background Art

[0002] At present, with the development of science and technology, augmented reality (AR) display technology is gradually being understood by more and more people, and has more and more applications in real life.

[0003] The imaging system is one of the core parts of AR technology. In order to facilitate the product structure design of the imaging system, a polarization beam splitter (PBS) is usually used to fold the optical path. However, due to the polarization beam splitting characteristics of PBS, more than half of the energy of non-polarized light will be lost after entering the PBS. Utility Model Content

[0004] The utility model provides an optical system and near-eye display equipment, which can reduce the energy loss of non-polarized light.

[0005] In a first aspect, an embodiment of the utility model provides an optical system, which includes: a display module, a first shaping module, a polarization beam splitter prism, a first reflection module and a second reflection module. The light incident side of the first shaping module is arranged at the light exiting side of the display module, the light exiting side of the first shaping module, the polarization beam splitter prism and the second reflection module are arranged in sequence along the first direction, the first reflection module and the polarization beam splitter prism are arranged in sequence along the second direction, and the first direction is not parallel to the second direction; wherein, the display module is used to output a light beam with image information; the first shaping module is used to receive the light beam, and output the light beam to the polarization beam splitter prism after turning or shaping the light beam; the polarization beam splitter prism is used to reflect the first polarized light in the light beam to the first reflection module, and transmit the second polarized light in the light beam to the second reflection module; the first reflection module is used to reflect the third polarized light to the polarization beam splitter prism based on the first polarized light, and the polarization state of the third polarized light is the same as the polarization state of the second polarized light; the second reflection module is used to reflect the fourth polarized light to the polarization beam splitter prism based on the second polarized light, and the polarization state of the fourth polarized light is the same as the polarization state of the first polarized light; the polarization beam splitter prism is also used to transmit the third polarized light and reflect the fourth polarized light.

[0006] In some embodiments, if the first shaping module is used to deflect the light beam, the first shaping module includes a first prism, the first prism includes a light incident surface, a light emitting surface and at least one deflection surface; the light incident surface is arranged on the light emitting side of the display module, and the light emitting surface, the polarization splitter prism and the second reflection module are arranged in sequence along the first direction; wherein, the first prism is used to receive the light beam through the light incident surface, and deflect the light beam to the light emitting surface through at least one of the deflection surfaces.

[0007] In some embodiments, the polarization splitter prism includes a second prism and a third prism; the second prism and the third prism are bonded to form a polarization splitting surface, the light-emitting surface, the second prism, the polarization splitting surface, the third prism and the second reflection module are sequentially arranged along the first direction, and the first reflection module, the second prism, the polarization splitting surface and the third prism are sequentially arranged along the second direction.

[0008] In some embodiments, the first prism and the second prism are an integral structure.

[0009] In some embodiments, if the first shaping module is used to shape the light beam, the first shaping module includes a first lens; and the first lens is disposed between the display module and the polarization beam splitter prism.

[0010] In some embodiments, the optical system also includes a second shaping module; the first reflection module, the polarization splitter prism and the second shaping module are arranged in sequence along the second direction, wherein the second shaping module is used to receive the third polarized light and the fourth polarized light, and to shape the third polarized light and the fourth polarized light.

[0011] In some embodiments, the first reflection module includes a first quarter wave plate and a first reflection lens. The first reflection lens, the first quarter wave plate and the polarization beam splitter prism are sequentially arranged along the second direction.

[0012] In some embodiments, the second reflection module includes a second quarter wave plate and a second reflection lens. The light exiting side of the first shaping module, the polarization beam splitter prism, the second quarter wave plate and the second reflection lens are sequentially arranged along the first direction.

[0013] In a second aspect, an embodiment of the utility model provides a near-eye display device, the near-eye display device comprising: an optical waveguide, and an optical system as described in any one of the first aspects. The coupling inlet of the optical waveguide is arranged corresponding to the light output side of the optical system.

[0014] In some embodiments, the optical waveguide is an arrayed optical waveguide.

[0015] Compared with the prior art, the beneficial effects of the present invention are: different from the prior art, the embodiment of the present invention provides an optical system and an optical waveguide, the optical system comprising: a display module, a first shaping module, a polarization beam splitter prism, a first reflection module and a second reflection module. The light incident side of the first shaping module is arranged at the light output side of the display module, the light output side of the first shaping module, the polarization beam splitter prism and the second reflection module are arranged in sequence along the first direction, the first reflection module and the polarization beam splitter prism are arranged in sequence along the second direction, and the first direction is not parallel to the second direction; wherein the display module is used to output a light beam with image information; the first shaping module is used to receive the light beam, and output it to the polarization beam splitter prism after bending or shaping the light beam; the polarization beam splitter prism is used to reflect the first polarized light in the light beam to the first reflection module, and transmit the second polarized light in the light beam to the second reflection module; the first reflection module is used to reflect the third polarized light to the polarization beam splitter prism based on the first polarized light, and the polarization state of the third polarized light is the same as the polarization state of the second polarized light; the second reflection module is used to reflect the fourth polarized light to the polarization beam splitter prism based on the second polarized light, and the polarization state of the fourth polarized light is the same as the polarization state of the first polarized light; the polarization beam splitter prism is also used to transmit the third polarized light and reflect the fourth polarized light. In this optical system, the non-polarized light beam output by the display module passes through the polarization splitter prism, the first reflection module and the second reflection module, so that the light beams in the first polarization state and the second polarization state can be emitted along the second direction, thereby improving the energy utilization efficiency of the non-polarized light and reducing the energy loss of the non-polarized light. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements / modules and steps with the same reference numerals in the drawings are represented as similar elements / modules and steps. Unless otherwise specified, the figures in the drawings do not constitute proportional limitations.

[0017] Figure 1 It is a structural schematic diagram of an optical system provided by an embodiment of the utility model;

[0018] Figure 2 It is a structural schematic diagram of another optical system provided by an embodiment of the utility model;

[0019] Figure 3 It is a structural schematic diagram of another optical system provided by an embodiment of the utility model;

[0020] Figure 4 It is a structural schematic diagram of another optical system provided by an embodiment of the utility model;

[0021] Figure 5is a schematic structural diagram of a fifth optical system provided by an embodiment of the utility model;

[0022] Figure 6 It is a structural schematic diagram of a near-eye display device provided by an embodiment of the utility model;

[0023] Figure 7 is a schematic structural diagram of another near-eye display device provided by an embodiment of the utility model;

[0024] Figure 8 It is a structural schematic diagram of another near-eye display device provided by an embodiment of the utility model;

[0025] Fig. 9 is a structural schematic diagram of another near-eye display device provided by an embodiment of the utility model;

[0026] Fig.10 It is a schematic diagram of the optical path of a near-eye display device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0027] The utility model is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the utility model. These all fall within the scope of protection of the utility model.

[0028] For ease of understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those generally understood by those skilled in the art of the present application. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not used to limit the present application. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0029] It should be noted that, if there is no conflict, the various features in the embodiments of the present utility model can be combined with each other, and all are within the scope of protection of this application. In addition, although the functional module division is performed in the device schematic, in some cases, the module division can be different from that in the device. In addition, the words "first", "second", etc. used in this article do not limit the data and execution order, but only distinguish the same items or similar items with basically the same functions and effects.

[0030] In a first aspect, the present invention provides an optical system 100. Figure 1The optical system 100 includes: a display module 10, a first shaping module 20, a polarization beam splitting prism 30, a first reflection module 40 and a second reflection module 50.

[0031] The light incident side of the first shaping module 20 is arranged at the light emitting side of the display module 10, the light emitting side of the first shaping module 20, the polarization beam splitter prism 30 and the second reflection module 50 are arranged in sequence along the first direction x, the first reflection module 40 and the polarization beam splitter prism 30 are arranged in sequence along the second direction y, and the first direction x is not parallel to the second direction y.

[0032] Among them, the display module 10 is used to output a light beam with image information. The first shaping module 20 is used to receive the light beam, and output it to the polarization beam splitter prism 30 after turning the light beam or shaping the light beam. The polarization beam splitter prism 30 is used to reflect the first polarized light in the light beam to the first reflection module 40, and transmit the second polarized light in the light beam to the second reflection module 50. The first reflection module 40 is used to reflect the third polarized light to the polarization beam splitter prism 30 based on the first polarized light, and the polarization state of the third polarized light is the same as the polarization state of the second polarized light. The second reflection module 50 is used to reflect the fourth polarized light to the polarization beam splitter prism 30 based on the second polarized light, and the polarization state of the fourth polarized light is the same as the polarization state of the first polarized light. The polarization beam splitter prism 30 is also used to transmit the third polarized light and reflect the fourth polarized light.

[0033] The display module 10 may include, but is not limited to, one of LCD, OLED, LCOS, DMD, DLP, and Micro-LED, which may emit unpolarized light carrying image information.

[0034] The first shaping module 20 may include a lens, a prism, or a combination of a lens and a prism, and other suitable optical devices that can be used for turning or shaping. The number of lenses and prisms to be set can be selected according to actual needs. In this article, turning a light beam refers to adjusting the propagation path of the light beam to deflect it; shaping a light beam refers to adjusting optical parameters such as the shape, size or direction of the light beam to converge or diverge the light beam.

[0035] The polarization splitting prism 30 has a polarization splitting surface S1, and the polarization splitting surface S1 has polarization splitting characteristics. The polarization splitting surface S1 can reflect light of a first polarization state and transmit light of a second polarization state. In the present utility model, the first polarization state is described as an S polarization state and the second polarization state is a P polarization state, that is, the polarization states of the first polarized light and the fourth polarized light are both S polarization states, and the polarization states of the second polarized light and the third polarized light are both P polarization states. In practical applications, the first polarization state can be a P polarization state, and the second polarization state can be an S polarization state. In practical applications, the polarization states of the first polarized light and the fourth polarized light can be a P polarization state, and the polarization states of the second polarized light and the third polarized light can be an S polarization state.

[0036] The first reflection module 40 has the function of reflecting light and changing the polarization state of light. After the light with the first polarization state enters the first reflection module 40, it will be reflected by the first reflection module 40 and then re-enter the polarization beam splitter prism 30, and the polarization state of the light reflected by the first reflection module 40 will be changed to the second polarization state.

[0037] The second reflection module 50 has the function of reflecting light and changing the polarization state of light. After the light with the second polarization state enters the second reflection module 50, it will be reflected by the second reflection module 50 and then re-enter the polarization beam splitter prism 30, and the polarization state of the light reflected by the second reflection module 50 will be changed to the first polarization state.

[0038] Specifically, the first direction x and the second direction y are set at a preset angle, and the preset angle can be 90°. In the optical system 100, the light beam carrying image information emitted by the display module 10 contains both light in the S polarization state and light in the P polarization state. When the light beam enters the first shaping module 20, the light beam can be turned or shaped and then output to the polarization beam splitter prism 30 along the first direction x; the polarization beam splitter prism 30 reflects the first polarization light with the S polarization state along the opposite direction of the second direction y to the first reflection module 40, and transmits the second polarization light with the P polarization state along the first direction x to the second reflection module 50; then, the first reflection module 40 reflects the first polarization light and changes the polarization state of the first polarization light, so that the reflection light entering the polarization beam splitter prism 30 The polarization state of the light is changed to the P polarization state. At this time, the reflected light with the P polarization state is the third polarized light, and the third polarized light will enter the polarization splitter prism 30 along the second direction y; at the same time, the second reflection module 50 will reflect the second polarized light and change the polarization state of the second polarized light, so that the polarization state of the reflected light entering the polarization splitter prism 30 is changed to the S polarization state. At this time, the reflected light with the S polarization state is the fourth polarized light, and the fourth polarized light will enter the polarization splitter prism 30 in the opposite direction of the first direction x; then, the polarization splitter prism 30 will reflect the fourth polarized light with the S polarization state along the second direction y, and transmit the third polarized light with the P polarization state along the second direction y.

[0039] It can be seen that in the optical system 100, by providing the first reflection module 40 and the second reflection module 50, the non-polarized light beam emitted by the display module 10 can improve the utilization efficiency of the light beam in the first polarization state and the light beam in the second polarization state after passing through the optical system 100, thereby reducing the energy loss of the non-polarized light. In addition, compared with the embodiment in which the first shaping module 20 is not provided, the first shaping module 20 is further provided in the embodiment to turn or shape the light beam, so that in the process of optimizing the design of the optical system 100, the optical parameters of the first shaping module 20 can be adjusted, and there are many adjustment parameters, which can improve the field of view while ensuring the imaging quality.

[0040] In some of these examples, see Figure 1 The first reflection module 40 includes a first quarter wave plate 41 and a first reflection lens 42. The first reflection lens 42, the first quarter wave plate 41 and the polarization beam splitting prism 30 are sequentially arranged along the second direction y.

[0041] The first reflecting lens 42 includes a transmission surface and a reflection surface. The surface type of the transmission surface can be a plane or a curved surface, and the surface type of the reflection surface can be a curved surface. In this embodiment, the transmission surface is a plane and the reflection surface is a curved surface. In this way, the transmission surface of the first reflecting lens 42 can be arranged in close contact with the first quarter wave plate 41 to reduce the volume of the system. The first reflecting lens 42 can be an optical glass reflecting lens or a resin reflecting lens. The first quarter wave plate 41 is an optical device with an optical delay of 1 / 4 wavelength.

[0042] In the optical system 100, the first polarized light with the S polarization state is reflected by the polarization splitter prism 30 and enters the first quarter wave plate 41, and is transmitted through the first quarter wave plate 41 into the first reflecting lens 42. At this time, the light is reflected by the first reflecting lens 42 to the first quarter wave plate 41, and is transmitted through the first quarter wave plate 41 to form a third polarized light. Since the third polarized light is formed by the first polarized light passing through the first quarter wave plate 41 twice, the polarization state of the third polarized light will be the P polarization state. In this way, when the third polarized light re-enters the polarization splitter prism 30, the third polarized light will be transmitted by the polarization splitter prism 30 along the second direction y.

[0043] It can be seen that in this embodiment, by providing the first quarter wave plate 41 and the first reflecting lens 42 , the first reflecting module 40 can have the polarization changing function and the reflecting function.

[0044] In some of these embodiments, please continue to see Figure 1The second reflection module 50 includes a second quarter wave plate 51 and a second reflection lens 52. The light exiting side of the first shaping module 20, the polarization beam splitter prism 30, the second quarter wave plate 51 and the second reflection lens 52 are sequentially arranged along the first direction x.

[0045] The second reflecting lens 52 includes a transmission surface and a reflection surface. The surface type of the transmission surface can be a plane or a curved surface, and the surface type of the reflection surface can be a curved surface. In this embodiment, the transmission surface is a plane and the reflection surface is a curved surface. In this way, the transmission surface of the second reflecting lens 52 can be arranged in close contact with the second quarter wave plate 51 to reduce the volume of the system. The second reflecting lens 52 can be an optical glass reflecting lens or a resin reflecting lens. The second quarter wave plate 51 is an optical device with an optical delay of 1 / 4 wavelength.

[0046] In the optical system 100, the second polarized light with a P polarization state is transmitted through the polarization splitter prism 30 into the second quarter wave plate 51, and is transmitted through the second quarter wave plate 51 into the second reflecting lens 52. At this time, the light is reflected by the second reflecting lens 52 to the second quarter wave plate 51, and is transmitted through the second quarter wave plate 51 to form a fourth polarized light. Since the fourth polarized light is formed by the second polarized light passing through the second quarter wave plate 51 twice, the polarization state of the fourth polarized light will be a P polarization state. In this way, when the fourth polarized light re-enters the polarization splitter prism 30, the fourth polarized light will be reflected by the polarization splitter prism 30 along the second direction y.

[0047] It can be seen that in this embodiment, by providing the second quarter wave plate 51 and the second reflecting lens 52 , the second reflecting module 50 can have the polarization changing function and the reflecting function.

[0048] In order to further improve the light utilization efficiency, in some embodiments, the angle between the first quarter wave plate 41 and the polarization splitting plane S1 can be the same as the angle between the second quarter wave plate 51 and the polarization splitting plane S1, and the first reflecting lens 42 and the second reflecting lens 52 are completely identical and mirror-symmetrical about the polarization splitting plane S1, thereby improving the consistency and overlap of the imaging state of the light beam emitted by the display module 10 through the first reflecting module 40 and the second reflecting module 50, further reducing the light loss and improving the light efficiency.

[0049] In some embodiments, if the first shaping module 20 is used to bend the light beam, please refer to Figure 2, the first shaping module 20 includes a first prism 21, and the first prism 21 includes a light incident surface S2, a light emitting surface S3 and at least one turning surface S4. The light incident surface S2 of the first prism 21 is arranged on the light emitting side of the display module 10, and the light emitting surface S3 of the first prism 21, the polarization beam splitting prism 30 and the second reflection module 50 are arranged in sequence along the first direction x. Among them, the first prism 21 is used to receive the light beam through the light incident surface S2, and to turn the light beam to the light emitting surface S3 through at least one turning surface S4.

[0050] For details, please continue to refer to Figure 2 , the cross-sectional shape of the first prism 21 along the first direction x can be a triangle, which includes a light incident surface S2, a light emitting surface S3 and a turning surface S4. The first prism 21 receives the light beam through the light incident surface S2, and turns the light beam to the light emitting surface S3 through the turning surface S4. In the optical system 100, after the light beam carrying image information emitted by the display module 10 enters the first prism 21 through the light incident surface S2 of the first prism 21, it will be reflected by the turning surface S4 of the first prism 21. The reflected light beam will reach the light emitting surface S3 and be emitted to the polarization splitter prism 30 along the first direction x, wherein the light beam can be totally reflected on the turning surface S4 of the first prism 21. In practical applications, the cross-sectional shape of the first prism 21 along the first direction x can be a quadrilateral, a pentagon or other suitable shapes.

[0051] In this embodiment, the light beam is deflected by the first prism 21, so that the focal length of the optical system 100 can be lengthened. During the application process, the parameters of the first prism 21 are designed to achieve a large field of view while ensuring the imaging quality.

[0052] In some of these examples, see Figure 2 The polarization beam splitting prism 30 includes a second prism 31 and a third prism 32. The second prism 31 and the third prism 32 are attached to form a polarization beam splitting surface S1. The light emitting surface S3 of the first prism 21, the second prism 31, the polarization beam splitting surface S1, the third prism 32 and the second reflection module 50 are sequentially arranged along the first direction x. The first reflection module 40, the second prism 31, the polarization beam splitting surface S1 and the third prism 32 are sequentially arranged along the second direction y.

[0053] For details, please refer to Figure 2, the cross-sectional shape of the second prism 31 and the third prism 32 along the first direction x can be a triangle. In practical applications, the cross-sectional shape of the first prism 21 along the first direction x can be a quadrilateral, a pentagon or other suitable shapes. In the optical system 100, the light beam emitted from the first prism 21 will pass through the second prism 31 along the first direction x to reach the polarization splitting surface S1, and then the polarization splitting surface S1 will reflect the first polarized light with the S polarization state along the opposite direction of the second direction y, and transmit it to the first reflection module 40 through the second prism 31, and transmit the second polarized light with the P polarization state along the first direction x to the third prism 32, and transmit it to the second reflection module 50 through the third prism 32; then, the first reflection module 40 will reflect the first polarized light and change the polarization state of the first polarized light, so that the polarization state of the reflected light is changed to the P polarization state, and at this time, the first polarized light with the S polarization state is reflected to the first polarization state. The reflected light in the P polarization state is the third polarized light, which will enter the third prism 32 along the second direction y and reach the polarization splitting plane S1; at the same time, the second reflection module 50 will reflect the second polarized light and change the polarization state of the second polarized light, so that the polarization state of the reflected light is changed to the S polarization state. At this time, the reflected light with the S polarization state is the fourth polarized light, which will enter the second prism 31 in the opposite direction of the first direction x and reach the polarization splitting plane S1; then, the polarization splitting plane S1 will reflect the fourth polarized light in the S polarization state along the second direction y, and transmit the third polarized light with the P polarization state along the second direction y.

[0054] It can be seen that in the optical system 100, by setting the second prism 31 and the third prism 32, the non-polarized light beam emitted by the display module 10 can improve the utilization efficiency of the light in the first polarization state and the light in the second polarization state after passing through the above-mentioned optical system 100, thereby reducing the energy loss of the non-polarized light.

[0055] In addition, in order to improve the compactness of the optical system 100, in some embodiments, see Figure 2 The light-emitting surface of the first prism 21 can be arranged in close contact with the second prism 31, which can reduce the volume of the optical system 100. In practical applications, the two may not be arranged in close contact.

[0056] In some of these embodiments, please refer to Figure 2 and see Figure 3 The first prism 21 and the second prism 31 are an integrated structure, that is, the first prism 21 and the second prism 31 are designed and manufactured as a whole to form a single optical element, namely, the turning prism 211 .

[0057] For details, please refer to Figure 3The cross-sectional shape of the turning prism 211 along the first direction x can be a triangle, and the turning prism 211 has a first surface, a second surface and a third surface, wherein the light-emitting side of the display module 10 is arranged in the first area of ​​the first surface, and the first reflection module 40 is arranged in the second area of ​​the first surface along the second direction y. The second surface of the turning prism 211 is used to turn the light beam, and the third surface of the turning prism 211 is bonded to the third prism 32 to form a polarization splitting surface S1.

[0058] In the optical system 100, the light beam emitted by the display module 10 will be incident on the turning prism 211 through the first area of ​​the first surface of the turning prism 211, and then reflected to the polarization splitting surface S1 through the second surface of the turning prism 211. Then, the polarization splitting surface S1 will reflect the first polarized light with the S polarization state in the opposite direction of the second direction y, and transmit it to the first reflection module 40 through the second area of ​​the first surface of the turning prism 211, and transmit the second polarized light with the P polarization state along the first direction x to the third prism 32, and transmit it to the second reflection module 50 through the third prism 32; then, the first reflection module 40 will reflect the first polarized light and change the polarization state of the first polarized light, so that the reflected light The polarization state of the line is changed to a P polarization state. At this time, the reflected light with a P polarization state is the third polarized light, and the third polarized light will be transmitted to the polarization splitting surface S1 through the second area of ​​the first surface of the turning prism 211 along the second direction y; at the same time, the second reflection module 50 will reflect the second polarized light and change the polarization state of the second polarized light, so that the polarization state of the reflected light is changed to an S polarization state. At this time, the reflected light with an S polarization state is the fourth polarized light, and the fourth polarized light will enter the second prism 31 in the opposite direction of the first direction x and reach the polarization splitting surface S1; then, the polarization splitting surface S1 will reflect the fourth polarized light with an S polarization state along the second direction y, and transmit the third polarized light with a P polarization state along the second direction y.

[0059] In this embodiment, by making the first prism 21 and the second prism 31 an integrated structure, the number of optical components can be reduced and the manufacturing cost can be lowered.

[0060] In some of these examples, see Figure 4 If the first shaping module 20 is used for shaping the light beam, the first shaping module 20 includes a first lens 22 ; the first lens 22 is disposed between the display module 10 and the polarization beam splitter prism 30 .

[0061] The first lens 22 may be a single lens, a cemented lens, etc., and the number of the first lenses 22 may be greater than or equal to 1. Specifically, the display module 10, the first lens 22, the second prism 31, the polarization splitting surface S1, the third prism 32, and the second reflection module 50 are sequentially arranged along the first direction x, and the first reflection module 40, the second prism 31, the polarization splitting surface S1, and the third prism 32 are sequentially arranged along the second direction y.

[0062] In the optical system 100, the light beam emitted by the display module 10 will be emitted to the polarization beam splitter prism 30 through the first lens 22. The subsequent light path can refer to the previous embodiment, which will not be repeated here. In this embodiment, by setting the first lens 22, the surface type, curvature and other optical parameters of the first lens 22 can be designed in actual applications to shape the light beam and improve the imaging quality.

[0063] In some of these examples, see Figure 4 or Figure 5 The optical system 100 further includes a second shaping module 60. The first reflection module 40, the polarization beam splitter prism 30 and the second shaping module 60 are sequentially arranged along the second direction y, wherein the second shaping module 60 is used to receive the third polarized light and the fourth polarized light and to shape the third polarized light and the fourth polarized light.

[0064] In the optical system 100, the light beam emitted from the polarization beam splitter prism 30 will be emitted through the second shaping module 60. The second shaping module 60 may include at least one lens, which may be a single lens, a cemented lens, etc. In this embodiment, by providing the second shaping module 60, the surface type, curvature and other optical parameters of the lens in the second shaping module 60 may be designed in practical applications to shape the light beam, change the shape, size or direction of the light beam, and further improve the imaging quality.

[0065] In a second aspect, the present invention provides a near-eye display device, see Figures 6 to 9 The near-eye display device comprises: an optical waveguide 200 and an optical system 100 as any one of the first aspect. The coupling inlet of the optical waveguide 200 is arranged corresponding to the light output side of the optical system 100.

[0066] The optical waveguide 200 may be made of transparent materials such as glass or resin, and the coupling inlet of the optical waveguide 200 may be a coupling-in splitting surface of the optical waveguide 200. Figure 6 or Figure 7 As shown, the coupling inlet of the optical waveguide 200 can be arranged in close contact with the light-emitting side of the optical system 100, or, as shown in FIG. Figure 8 or Fig. 9 As shown, the coupling inlet of the optical waveguide 200 may not be aligned with the light output side of the optical system 100 .

[0067] Specifically, in some embodiments, the optical waveguide is an array optical waveguide having a coupling inlet and an outcoupling splitting surface, wherein Figure 6The out-coupling splitting surface includes a plurality of splitting surfaces P1 which are parallel to each other and have splitting characteristics. Each splitting surface P1 is embedded between the upper and lower surfaces of the optical waveguide 200 and has a specific angle with the upper and lower surfaces of the optical waveguide 200. It can be used to couple out the totally reflected light inside the optical waveguide 200 through the principles of reflection and refraction.

[0068] In this embodiment, the optical system has the same structure and function as the optical system described in any one of the first aspects, and will not be described in detail here.

[0069] In the near-eye display device, see Fig.10 After the optical system 100 emits the third polarized light and the fourth polarized light, the third polarized light and the fourth polarized light are both incident into the interior of the optical waveguide 200 through the coupling inlet of the optical waveguide 200, and are totally reflected inside and propagate to the coupling-out region, and finally coupled out through pupil expansion in the coupling-out region.

[0070] In addition, in an embodiment where the first shaping module 20 is used to deflect a light beam, Figure 7 In the embodiment shown, the turning prism 211 can be designed to make the near-eye display device more in line with the shape of glasses, and the screen can be moved away from the face to avoid discomfort caused by screen heating; moreover, by adjusting the angle θ between the coupled splitting surface and the surface of the optical waveguide 200, and the angle φ between the first surface of the turning prism 211 and the polarization splitting surface S1, different customized angle requirements can be met for people with different face shapes.

[0071] Specifically, the included angle between the second surface of the turning prism 211 and the polarization splitting surface S1 can be set to 90°, and the included angle α between the second surface of the turning prism 211 and the surface of the optical waveguide 200 is:

[0072] α=90°-φ-θ;

[0073] In this way, different customized angle requirements can be achieved by adjusting the values ​​of θ and φ. For example, when θ is 51° and φ is 45°, α is 96°, which can put the near-eye display device in an outward-expanded state, which is consistent with the outward-expanded shape of the temples of conventional glasses. It can be seen that the optical system provided by the utility model is subsequently applied to near-eye display devices, which is convenient for adapting to the shape of glasses and is conducive to near-eye display applications.

[0074] It should be noted that the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of ​​the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical system, characterized in that: include: A display module, a first shaping module, a polarization beam splitter prism, a first reflection module and a second reflection module; The light incident side of the first shaping module is arranged at the light exiting side of the display module, the light exiting side of the first shaping module, the polarization beam splitter prism and the second reflection module are arranged in sequence along a first direction, the first reflection module and the polarization beam splitter prism are arranged in sequence along a second direction, and the first direction is not parallel to the second direction; Wherein, the display module is used to output a light beam carrying image information; The first shaping module is used to receive the light beam, and output the light beam to the polarization beam splitter after bending or shaping the light beam; The polarization beam splitter prism is used to reflect the first polarized light in the light beam to the first reflection module, and transmit the second polarized light in the light beam to the second reflection module; The first reflection module is used for reflecting a third polarized light to the polarization beam splitter prism based on the first polarized light, and the polarization state of the third polarized light is the same as the polarization state of the second polarized light; The second reflection module is used for reflecting fourth polarized light to the polarization beam splitter prism based on the second polarized light, and the polarization state of the fourth polarized light is the same as the polarization state of the first polarized light; The polarization beam splitter prism is further configured to transmit the third polarized light and reflect the fourth polarized light.

2. The optical system according to claim 1, characterized in that If the first shaping module is used to deflect the light beam, the first shaping module includes a first prism, and the first prism includes a light incident surface, a light exit surface and at least one deflection surface; The light incident surface is arranged at the light emitting side of the display module, and the light emitting surface, the polarization beam splitter prism and the second reflection module are arranged in sequence along the first direction; Wherein, the first prism is used to receive the light beam through the light incident surface, and to deflect the light beam to the light emitting surface through at least one of the deflection surfaces.

3. The optical system according to claim 2, characterized in that The polarization beam splitter prism includes a second prism and a third prism; The second prism and the third prism are bonded to form a polarization splitting surface, the light emitting surface, the second prism, the polarization splitting surface, the third prism and the second reflection module are arranged in sequence along the first direction, and the first reflection module, the second prism, the polarization splitting surface and the third prism are arranged in sequence along the second direction.

4. The optical system according to claim 3, characterized in that The first prism and the second prism are an integrated structure.

5. The optical system according to claim 1, characterized in that If the first shaping module is used to shape the light beam, the first shaping module includes a first lens; The first lens is disposed between the display module and the polarization beam splitting prism.

6. The optical system according to any one of claims 1 to 5, characterized in that: The optical system also includes a second shaping module; The first reflection module, the polarization beam splitter prism and the second shaping module are sequentially arranged along the second direction, The second shaping module is used to receive the third polarized light and the fourth polarized light, and to shape the third polarized light and the fourth polarized light.

7. The optical system according to any one of claims 1 to 5, characterized in that: The first reflection module includes a first quarter wave plate and a first reflection lens; The first reflecting lens, the first quarter wave plate and the polarization beam splitter prism are sequentially arranged along the second direction.

8. The optical system according to any one of claims 1 to 5, characterized in that: The second reflection module includes a second quarter wave plate and a second reflection lens; The light-emitting side of the first shaping module, the polarization beam splitter prism, the second quarter-wave plate and the second reflecting lens are sequentially arranged along the first direction.

9. A near-eye display device, characterized in that: include: An optical waveguide, and an optical system as claimed in any one of claims 1 to 8; The coupling inlet of the optical waveguide is arranged corresponding to the light output side of the optical system.

10. The near-eye display device according to claim 9, characterized in that: The optical waveguide is an array optical waveguide.

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