CN216848433U - Polarization refraction and reflection type micro-projection mechanism and micro-projection device - Google Patents

Abstract

The utility model mainly provides a polarization refraction and reflection type micro-projection mechanism and a micro-projection device, the polarization refraction and reflection type micro-projection mechanism comprises a polarization refraction and reflection type micro-projection system and a projection light source, the polarization refraction and reflection type micro-projection system and the projection light source are packaged together, wherein the polarization-catadioptric micro-projection system comprises at least one polarization recovery system, a first polarizer, a first 1/4 wave plate, a partially transmissive and partially reflective element, a second 1/4 wave plate, a second polarizer, and a plurality of lenses, the polarization recovery system, the first polarizer, the first 1/4 wave plate, the partially transmissive partially reflective element, the second 1/4 wave plate, and the second polarizer are sequentially arranged and respectively disposed on different surfaces of the lens, thereby improving the utilization rate of light. The utility model discloses little projection mechanism of polarization refraction and reflection type and little projection arrangement can realize that the structure is miniaturized.

Description

Polarization refraction and reflection type micro-projection mechanism and micro-projection device

Technical Field

The utility model belongs to the optical element field particularly, the utility model relates to a little projection system of polarization refraction and reflection formula and little projection arrangement for augmented reality display device.

Background

Augmented Reality (AR) display systems often include: micro-projection system and optical waveguide system, optical waveguide system divide into again: the diffraction optical waveguide and the geometric array optical waveguide transmit the information projected from the micro-projection system to human eyes through the optical waveguides. The diffractive optical waveguide is typically a transparent glass sheet containing microstructures, the volume of the system is typically smaller than that of the geometric array optical waveguide system, so that the product form is easily accepted by consumers, and the use range of the diffractive optical waveguide AR system is far larger than that of the array optical waveguide; correspondingly, the volume of the micro-projection system is reduced as much as possible to match with the diffraction light waveguide system, so that the whole augmented reality system is miniaturized.

Micro-projection mechanisms are often used to project the image content in the display screen onto the incoupling region of the diffractive waveguide sheet. The volume of the optical system determines whether the projection mechanism can be used for more product forms, the existing projection mechanism is large in volume and difficult to integrate into products such as a small-volume glasses frame, the wearing comfort and the attractiveness are solved, and the projection mechanism can be easily solved by using the polarization catadioptric projection mechanism.

There are also a number of implementations of micro-projection systems:

an AR display scheme based on Micro-OLED (due to limitation of light emitting brightness, a near-to-eye display optical system adapted to the Micro-OLED is generally a catadioptric optical path with high optical efficiency and a simple optical path, wherein a prism system and a Birdbath optical system are the most common, and the Micro-OLED has a small FOV and easily blocks a view line).

And secondly, an AR display optical path based on the LCOS/DMD (because a display chip cannot independently emit light, an illumination optical system is required for illumination, and the system volume is large).

And thirdly, the Micro-LED based AR display scheme (which has the great advantage of high brightness, so that the Micro-LED based AR display scheme can be suitable for the in-eye display light path of the array/diffraction waveguide which is closer to the glasses shape). However, the divergence angle of the Micro-LED light source is large, and the Micro-LED light source is difficult to match with the NA angle of the projection system, so that the waste of light energy is caused, and therefore, when the NA angle of the projection system is increased as much as possible, more light energy of the Micro-LED can be received.

The Micro-LED source divergence angle versus intensity distribution is shown in fig. 4:

and fig. 5 is a relationship between the divergence angle of the light source and the light intensity transmission efficiency when the divergence angle is ± 5 ° -30 °, where the divergence angle of the light source corresponds to the NA angle of the image space in the micro-projection system, and the larger the NA angle is, the more light energy can be received by the projection mechanism, and the higher the transmission efficiency is. The polarization catadioptric system can obtain a larger field angle under the condition of shorter total length of the system, so that the system can obtain a large NA angle in a small-volume state, and the transmission efficiency is improved.

The main parameters of the projection mechanism include: focal length, field of view (FOV), aperture, entrance pupil size, screen/display size, NA angle, etc. The optimization aims at good imaging quality and smaller caliber and length.

At present, a common projection mechanism is a transmission-type projection mechanism, the number of lenses is large, the total length of a system is long, and the caliber is large, so that the system is large in size and difficult to integrate into a small product, and practical product application is realized.

SUMMERY OF THE UTILITY MODEL

An advantage of the utility model is that a polarization is turned over little projection mechanism of formula and is little projection arrangement is provided, wherein polarization is turned over little projection mechanism of formula and is little projection arrangement for projection system and projection equipment among the prior art, small, light in weight, like the matter good, consequently can realize projection equipment and augmented reality system's miniaturization to promote its consumer goods ization, with adaptation market demand.

An advantage of the present invention is to provide a little projection mechanism of polarization refraction and little projection arrangement, wherein the little projection mechanism of polarization refraction and little projection arrangement can reduce the lens quantity that uses to reduce little projection system or little projection arrangement's weight, in order to realize little projection arrangement and little projection system's miniaturization.

An advantage of the utility model is that a little projection system of polarization formula and little projection arrangement are provided, wherein the light path can be shortened to little projection mechanism of polarization formula and little projection arrangement to can obtain bigger angle of vision and more imaging quality under the circumstances that its overall length is shorter, effective bore is littleer and the volume is littleer, thereby be applicable to little projection system and little projection arrangement of short focal length, big visual field.

One advantage of the present invention is to provide a polarization catadioptric micro-projection mechanism, which includes a polarization catadioptric micro-projection system and a projection light source, wherein the polarization catadioptric micro-projection system and the projection light source are packaged together, wherein the polarization-catadioptric micro-projection system comprises at least one polarization recovery system, a first polarizer, a first 1/4 wave plate, a partially transmissive and partially reflective element, a second 1/4 wave plate, a second polarizer, and a plurality of lenses, wherein the polarization recycling system, the first polarizer, the first 1/4 wave plate, the partially transmissive and partially reflective element, the second 1/4 wave plate, and the second polarizer are sequentially arranged and respectively disposed on different surfaces of the lens, thereby improving utilization of light.

In some embodiments, the plurality of lenses includes a first lens, a second lens and a third lens, the second lens is disposed between the first lens and the third lens, the partially transmissive partially reflective element is disposed between the third lens and the polarization recovery system, the second polarizer and the second 1/4 wave plate are disposed as films and attached to two side surfaces of the second lens, respectively, and the first 1/4 wave plate and the first polarizer are also disposed as films and disposed on surfaces of the partially transmissive partially reflective element in sequence.

In some embodiments, the plurality of lenses includes a first lens, a second lens and a third lens, the second lens is disposed between the first lens and the third lens, the partially transmissive partially reflective element is disposed between the third lens and the polarization recovery system, the second polarizer and the second 1/4 wave plate are disposed as a film layer and attached to two side surfaces of the first lens, respectively, and the first 1/4 wave plate and the first polarizer are also disposed as a film layer and attached to a surface of the partially transmissive partially reflective element in sequence.

In some embodiments, the plurality of lenses includes a first lens, a second lens and a third lens, the second lens is disposed between the first lens and the third lens, the partially transmissive partially reflective element is disposed between the third lens and the polarization recovery system, the second polarizer and the second 1/4 wave plate are disposed as layers and attached to two side surfaces of the third lens, respectively, and the first 1/4 wave plate and the first polarizer are also disposed as layers and attached to a surface of the partially transmissive partially reflective element in sequence.

In some of these embodiments, the plurality of lenses includes a first lens, a second lens and a third lens, the second lens is disposed between the first lens and the third lens, the partially transmissive partially reflective element is disposed between the third lens and the polarization recovery system, the second polarizer and the second 1/4 wave plate are disposed as a film layer and attached to left and right side surfaces of the second lens, respectively, the partially transmissive partially reflective element is also disposed as a film layer and attached to a left side surface of the third lens, and the first 1/4 wave plate is disposed as a film layer and attached to a right side surface of the third lens.

In some of these embodiments, the surfaces of the first, second and third lenses comprise spherical and aspherical surfaces, wherein the aspherical formula is:

wherein c is the surface curvature; k is a conic coefficient;

x and y are coordinates of a point on the aspheric surface; alpha is a polynomial coefficient.

In some of these embodiments, the surfaces of the first lens, the second lens, and the third lens comprise a flat surface or a curved surface, and the first polarizer and the second polarizer can be attached to the surfaces of the first lens, the second lens, and the third lens.

In some embodiments, the polarization-catadioptric micro-projection system is disposed in front of a pupil, so that the light emitted from the projection light source passes through the polarization-catadioptric micro-projection system and reaches the pupil after being acted on by the polarization-catadioptric micro-projection system.

In some of these embodiments, the projection light source is a Micro-LED or a Micro-OLED.

The invention further provides a polarization catadioptric micro-projection device, which comprises a polarization catadioptric micro-projection mechanism and a waveguide plate, wherein the polarization catadioptric micro-projection mechanism is coupled to the waveguide plate, wherein the polarization catadioptric micro-projection mechanism comprises a polarization catadioptric micro-projection system and a projection light source, and the polarization catadioptric micro-projection system and the projection light source are packaged together, wherein the polarization catadioptric micro-projection system comprises at least a polarization recycling system, a first polarizer, a first 1/4 wave plate, a partially transmissive and partially reflective element, a second 1/4 wave plate, a second polarizer and a plurality of lenses, wherein the polarization recycling system, the first polarizer, the first 1/4, the partially transmissive and partially reflective element, The second 1/4 wave plate and the second polarizer are sequentially arranged and respectively arranged on the surfaces of different lenses, thereby improving the utilization rate of light and achieving the effect of augmented reality.

In some embodiments, the plurality of lenses includes a first lens, a second lens and a third lens, the second lens is disposed between the first lens and the third lens, the partially transmissive partially reflective element is disposed between the third lens and the polarization recovery system, the second polarizer and the second 1/4 wave plate are disposed as films and attached to two side surfaces of the second lens, respectively, and the first 1/4 wave plate and the first polarizer are also disposed as films and disposed on surfaces of the partially transmissive partially reflective element in sequence.

In some embodiments, the plurality of lenses includes a first lens, a second lens and a third lens, the second lens is disposed between the first lens and the third lens, the partially transmissive partially reflective element is disposed between the third lens and the polarization recovery system, the second polarizer and the second 1/4 wave plate are disposed as a film layer and attached to two side surfaces of the first lens, respectively, and the first 1/4 wave plate and the first polarizer are also disposed as a film layer and attached to a surface of the partially transmissive partially reflective element in sequence.

In some embodiments, the plurality of lenses includes a first lens, a second lens and a third lens, the second lens is disposed between the first lens and the third lens, the partially transmissive partially reflective element is disposed between the third lens and the polarization recovery system, the second polarizer and the second 1/4 wave plate are disposed as layers and attached to two side surfaces of the third lens, respectively, and the first 1/4 wave plate and the first polarizer are also disposed as layers and attached to a surface of the partially transmissive partially reflective element in sequence.

In some of these embodiments, the plurality of lenses includes a first lens, a second lens and a third lens, the second lens is disposed between the first lens and the third lens, the partially transmissive partially reflective element is disposed between the third lens and the polarization recovery system, the second polarizer and the second 1/4 wave plate are disposed as a film layer and attached to left and right side surfaces of the second lens, respectively, the partially transmissive partially reflective element is also disposed as a film layer and attached to a left side surface of the third lens, and the first 1/4 wave plate is disposed as a film layer and attached to a right side surface of the third lens.

In some of these embodiments, the waveguide sheet is an eyeglass lens structure.

Further objects and advantages of the invention will become apparent from a consideration of the ensuing description and drawings.

These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description, taken in conjunction with the accompanying drawings.

Drawings

Fig. 1 is a schematic structural diagram of a transmissive micro-projection mechanism in the prior art.

Fig. 2 is a schematic structural diagram of a polarization catadioptric micro-projection system according to the present invention.

Fig. 3 is a schematic diagram of the structure and optical path of each device in the polarization catadioptric micro-projection system shown in fig. 2.

FIG. 4 is a diagram illustrating the distribution of divergence angle and intensity distribution of a light source in the polarization catadioptric micro-projection system shown in FIG. 2.

Fig. 5 is a diagram illustrating the relationship between the divergence angle and the transmission efficiency in the polarization catadioptric micro-projection system shown in fig. 2.

Fig. 6 is a schematic structural diagram of a polarization catadioptric micro-projection system according to a first embodiment of the present invention.

Fig. 7 is a schematic optical path diagram of the polarization catadioptric micro-projection system shown in fig. 6.

Fig. 8 is an MTF plot for the polarization catadioptric micro-projection system described in fig. 6.

FIG. 9 is a distortion diagram of the polarization catadioptric micro-projection system described in FIG. 6.

Fig. 10 is a field curvature diagram of the polarization catadioptric micro-projection system described in fig. 6.

Fig. 11 is a diagram of relative illumination of the polarization catadioptric micro-projection system described in fig. 6.

Fig. 12 is a schematic structural diagram of a polarization catadioptric micro-projection system according to a second embodiment of the present invention.

FIG. 13 is a schematic diagram of an optical path of the polarization-catadioptric micro-projection system shown in FIG. 12.

Fig. 14 is an MTF plot for the polarization catadioptric micro-projection system described in fig. 12.

Fig. 15 is a distortion diagram of the polarization catadioptric micro-projection system described in fig. 12.

Fig. 16 is a field curvature diagram of the polarization catadioptric micro-projection system described in fig. 12.

Fig. 17 is a diagram of relative illumination of the polarization catadioptric micro-projection system described in fig. 12.

Fig. 18 is a schematic structural diagram of a polarization catadioptric micro-projection system according to a third embodiment of the present invention.

Fig. 19 is a schematic optical path diagram of the polarization catadioptric micro-projection system shown in fig. 18.

Fig. 20 is an MTF plot for the polarization catadioptric micro-projection system described in fig. 18.

Fig. 21 is a distortion diagram of the polarization catadioptric micro-projection system described in fig. 18.

FIG. 22 is a field curvature diagram of the polarization catadioptric micro-projection system described in FIG. 18.

Fig. 23 is a relative illuminance diagram of the polarization catadioptric micro-projection system described in fig. 18.

Fig. 24 is a schematic structural diagram of a polarization catadioptric micro-projection system according to a fourth embodiment of the present invention.

Fig. 25 is a schematic optical path diagram of the polarization catadioptric micro-projection system shown in fig. 24.

Fig. 26 is an MTF plot for the polarization catadioptric micro-projection system described in fig. 24.

FIG. 27 is a distortion diagram for the polarization catadioptric micro-projection system described in FIG. 24.

FIG. 28 is a field curvature diagram of the polarization catadioptric micro-projection system described in FIG. 24.

Fig. 29 is a relative illuminance diagram for the polarization catadioptric micro-projection system described in fig. 24.

Fig. 30 is a schematic perspective view of a polarization catadioptric micro-projection apparatus according to a first embodiment of the present invention.

Fig. 31 is a schematic perspective view of the polarization-catadioptric micro-projection device shown in fig. 30 coupled to a waveguide plate.

Fig. 32 is a schematic diagram of an application of the first embodiment of the polarization-catadioptric micro-projection device in fig. 30.

Detailed Description

The following description is provided to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships that are based on those shown in the drawings, which are merely for convenience in describing the present invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus the terms are not to be construed as limiting the invention.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

As shown in fig. 6 to 32, the present invention provides a polarization-catadioptric micro-projection system 10, as shown in fig. 2 to 5, the polarization-catadioptric micro-projection system 10 includes a plurality of lenses, a polarization recycling system 19, a first polarizer 18, a first 1/4 wave plate 17, a partially transmissive partially reflective element 16, a second 1/4 wave plate 15, and a second polarizer 14, wherein the polarization recycling system 19, the first polarizer 18, the first 1/4 wave plate 17, the partially transmissive partially reflective element 16, the second 1/4 wave plate 15, and the second polarizer 14 are sequentially arranged and respectively disposed on different surfaces of the lenses, so as to improve the utilization rate of light.

In detail, as shown in fig. 6 to 11, in the first embodiment of the polarization-catadioptric micro-projection system 10 of the present invention, the polarization-catadioptric micro-projection system 10 includes a first lens 11, the second polarizer 14, a second lens 12, the second 1/4 wave plate 15, a third lens 13, the partially transmissive and partially reflective element 16, the first 1/4 wave plate 17, the first polarizer 18, and the polarization recovery system 19, wherein the second lens 12 is disposed between the first lens 11 and the third lens 13, the partially transmissive and partially reflective element 16 is disposed between the third lens 13 and the polarization recovery system 19, the second polarizer 14 and the second 1/4 wave plate 15 are film layers and are respectively attached to two sides of the second lens 12, the first 1/4 wave plate 17 and the first polarizer 18 are also arranged as film layers and in turn arranged on the surface of the partially transmissive partially reflective element 16.

Fig. 7 is a schematic diagram of an optical path of the polarization-catadioptric micro-projection system 10 according to the present invention. Polarization catadioptric micro-projection system 10 is set up between pupil 30 and a projection light source 20, polarization recovery system 19 at first will the natural light that projection light source 20 sent turns into the line polarisation, because the line polarisation divide into S light and P light, wherein the P light pierces through, S light reflection, polarization recovery system 19 can make the S light of reflection turn into P light printing opacity again, makes the volume increase of the P light that sees through reflection many times to reach the purpose that the polarization was retrieved, thereby improve polarization catadioptric micro-projection system the utilization ratio of setting a light, and then promote polarization catadioptric micro-projection system 10' S work efficiency.

As shown in fig. 7 to 11, after passing through the first polarizer 18, the light coming out of the polarization recycling system 19 is converted into P light with a single polarization state by the first polarizer 18; after passing through the first 1/4 wave plate 17, the light is converted into circularly polarized light and is transmitted from the partially transmitting and partially reflecting element 16; the transmitted light reaches the second 1/4 wave plate 15, is converted into linearly polarized light and transmitted, and is reflected on the surface of the second polarizer 14, and the direction of the light is changed; then, after passing through the second 1/4 wave plate 15, the light is converted into circularly polarized light and transmitted from the second 1/4 wave plate 15, the light reaches the surface of the partially transmitting and partially reflecting element 16 again and is reflected by the surface of the partially transmitting and partially reflecting element 16, and the direction of the light is changed again; the light is then transmitted to the second 1/4 wave plate 15 and converted to linearly polarized light with its direction of vibration changed, and reaches the pupil 30.

In other words, as shown in fig. 2, in the first embodiment of the polarization catadioptric micro-projection system, the left and right surfaces of the first lens 11 are respectively a first transmission surface 1001 and a second transmission surface 1002, the second polarizer 14 and the second 1/4 wave plate 15 respectively form a polarized reflecting surface 1003 and a third transmitting surface 1004 on the left and right surfaces of the second lens 12, the left and right surfaces of the third lens 13 are a fourth transmission surface 1005 and a fifth transmission surface 1006, the partially transmissive partially reflective element 16, the first 1/4 wave plate 17, and the first polarizer 18 are disposed on the left side surface of the polarization recovery system 19 such that the left side surface of the polarization recovery system 19 forms a partially transmissive partially reflective surface 1007 and the right side of the polarization recovery system 19 forms a sixth transmissive surface 1008, respectively.

Light can sequentially enter the first transmission surface 1001, the second transmission surface 1002, the polarized reflection surface 1003, the third transmission surface 1004, the fourth transmission surface 1005, the fifth transmission surface 1006 and the partially transmission and partially reflection surface 1007, is reflected on the partially transmission and partially reflection surface 1007, is sequentially transmitted into the fifth transmission surface 1006, the fourth transmission surface 1005, the third transmission surface 1004 and the polarized reflection surface 1003, is reflected on the polarized reflection surface 1003 again, is sequentially transmitted through the third transmission surface 1004, the fourth transmission surface 1005, the fifth transmission surface 1006, the partially transmission and partially reflection surface 1007 and the sixth transmission surface 1008, and is finally imaged on the projection light source 20. And vice versa.

The utility model discloses in above-mentioned little projection system 10 of polarization catadioptric, light follows projection light source 20 passes through little projection system 10 of polarization catadioptric arrives during pupil 30, get into pupil 30's entrance pupil diameter is 3mm, and angle of vision is 40, and the focus is 4.5mm, and the Micro-LED40 screen diagonal size of use is 0.13 inch, and resolution ratio is 640 480, and the effective area size is 2.64 2mm, and the pixel size is 4 um.

The maximum effective aperture of the polarization catadioptric micro-projection system 10 is less than 4.5mm, the total length is 5.3mm, the distortion is 0.4861%, and the MTF is close to the diffraction limit at 125 lp/mm.

In the first embodiment of the polarization catadioptric micro-projection system 10 of the present invention, since the light coming out from the projection light source 20 is first polarization-recovered by the polarization recovery system 19, the overall transmission efficiency of the polarization catadioptric micro-projection system 10 is improved.

Fig. 12 to 17 are schematic structural diagrams of a polarization-catadioptric micro-projection system 10A according to a second embodiment of the present invention. In this second embodiment, the polarization-catadioptric micro-projection system 10A includes the second polarizer 14A, the first lens 11A, the second 1/4 wave plate 15A, the second lens 12A, the third lens 13A, the partially-transmissive partially-reflective element 16A, the first 1/4 wave plate 17A, the first polarizer 18A, and the polarization recycling system 19A, wherein the second polarizer 14A and the second 1/4 wave plate 15A are respectively disposed as film layers and respectively attached to both sides of the first lens 11A, and the first 1/4 wave plate 17A and the first polarizer 18A are also disposed as film layers and are sequentially attached to the surface of the partially-transmissive partially-reflective element 16A.

Fig. 13 is a schematic diagram of an optical path of a polarization-catadioptric micro-projection system 10A according to a second embodiment of the present invention. As shown in the figure, the polarization catadioptric micro-projection system 10A is disposed between a pupil 30A and a projection light source 20A, light emitted from the projection light source 20A first passes through the polarization recovery system 19A, and is converted into linearly polarized light by the polarization recovery system 19A, the linearly polarized light is divided into S light and P light, wherein the P light penetrates through the polarization recovery system 19A, the S light is reflected, the polarization recovery system 19 can convert the reflected S light into the P light again, and the amount of the transmitted P light is increased through multiple reflections, so as to achieve the purpose of polarization recovery, thereby achieving the utilization efficiency of the polarization catadioptric micro-projection system 10A on light.

After the light coming out of the polarization recovery system 19A passes through the first polarizer 18A, the first polarizer 18A converts the polarization state of the light into a single P light, and then the single P light passes through the first 1/4 wave plate 17A and is converted into a circularly polarized light; then, the light is transmitted to the second 1/4 wave plate 15A and then is converted into linearly polarized light; then reaches the second polarizer 14A and is reflected by the second polarizer 14A to complete the conversion of the light direction; then, the second 1/4 wave plate 15A is reached and converted into circularly polarized light by the second 1/4 wave plate 15A; reaches the surface of the partially transmissive partially reflective element 16A and is reflected by the partially transmissive partially reflective element 16A, again with a change in direction of the light rays; the light continues to transmit to the second 1/4 wave plate 15A and is converted to linearly polarized light with changed vibration direction, and finally reaches the pupil 30A.

As shown in fig. 13 to 17, in the second embodiment of the present invention, the first polarizer 18A and the second polarizer 14A are respectively disposed on the surface of the partially transmissive partially reflective element 16A and the surface of the lens, when the light passes through the polarized catadioptric Micro-projection system 10A from the projection light source 20A and reaches the pupil 30A, the entrance diameter of the pupil 30A is 3mm, the field angle is 40 °, the focal length is 4.5mm, the diagonal size of the used Micro-LED40 screen is 0.13 inch, the resolution is 640 × 480, the effective area size is 2.64 × 2mm, and the pixel size is 4 um.

The maximum effective aperture of the polarization catadioptric micro-projection system 10A is larger than 5mm, the total length is 5.3mm, and the distortion is 1%.

Compared with the first embodiment, in this embodiment, the second polarizer 14A is moved forward, so that the aperture of the polarization-catadioptric micro-projection system 10A is increased significantly, but the total length is not changed, and still belongs to a smaller size.

Fig. 18 to 23 are schematic structural diagrams of a polarization-catadioptric micro-projection system 10B according to a third embodiment of the present invention. As shown in fig. 18, the polarization-catadioptric micro-projection system 10B includes a first lens 11B, a second lens 12B, the second polarizer 14B, a third lens 13B, the second 1/4 wave plate 15B, the partially transmissive partially reflective element 16B, the first 1/4 wave plate 17B, the first polarizer 18B, and the polarization recycling system 19B, wherein the second polarizer 14B and the second 1/4 wave plate 15B are disposed as films and are respectively attached to two sides of the third lens 13B, and the first 1/4 wave plate 17B and the first polarizer 18B are also disposed as films and are sequentially attached to the surface of the partially transmissive partially reflective element 16B.

Fig. 19 is a schematic light path diagram of a polarization-catadioptric micro-projection system 10B according to a third embodiment of the present invention. The polarization catadioptric micro-projection system 10B is disposed between a pupil 30B and a projection light source 20B, light emitted from the projection light source 20B first reaches the polarization recovery system 19B, the polarization recovery system 19B converts light from natural light into linearly polarized light, the linearly polarized light includes S light and P light, the P light penetrates through the polarization recovery system 19B, the S light is reflected, the polarization recovery system 19B can convert the reflected S light into the P light again, the amount of the transmitted P light is increased through multiple reflections, the purpose of polarization recovery is achieved, and the use efficiency of the polarization catadioptric micro-projection system 10B on light is further improved.

The light transmitted from the polarization recycling system 19B reaches the first polarizer 18B, and the light is converted into P light with a single polarization state by the first polarizer 18B; after passing through the first 1/4 wave plate 17B, the light is converted into circularly polarized light; the light then transmits to the second 1/4 wave plate 15B and is converted into linearly polarized light; the light then reaches the second polarizer 14B and is reflected on the second polarizer 14B; then, the light reaches the second 1/4 wave plate 15B and is converted into circularly polarized light by the second 1/4 wave plate 15B; the light continues to penetrate through the second 1/4 wave plate 15B and reaches the surface of the partially transmissive partially reflective element 16B, and is reflected by the partially transmissive partially reflective element 16B, causing the handedness of the light to change; then, the light is projected to the second 1/4 wave plate 15B and converted into linearly polarized light with changed vibration direction, and finally reaches the pupil 30B.

As shown in fig. 19 to 23, in the third embodiment of the present invention, the first polarizer 18B and the second polarizer 14B are respectively disposed on the surface of the partially transmissive partially reflective element 16B and the surface of the third lens 13B, when the light passes through the polarization catadioptric Micro-projection system 10B from the projection light source 20B and reaches the pupil 30B, the entrance pupil diameter of the entrance pupil 30B is 3mm, the field angle is 40 °, the focal length is 4.5mm, the screen diagonal size of the Micro-LED40 used is 0.13 inch, the resolution is 640 x 480, the effective area size is 2.64 x 2mm, and the pixel size is 4 um.

The maximum effective aperture of the polarization catadioptric micro-projection system 10B is 6.9mm, the total length is 8mm, and the distortion is 4.9%.

In this third embodiment, the aperture and the total length of the polarization catadioptric micro-projection system 10B are increased due to the backward movement of the second polarizer 14B, but still smaller than the volume of the transmissive micro-projection system, compared to the first embodiment, and the performance of the polarization catadioptric micro-projection system 10B is better according to the above parameters.

Fig. 24 to 29 are schematic structural diagrams of a polarization-catadioptric micro-projection system 10C according to a fourth embodiment of the present invention. In the fourth embodiment, the polarization-catadioptric micro-projection system 10C includes a first lens 11C, a second lens 12C, a third lens 13C, the first polarizer 18C, the polarization recovery system 19C, the second polarizer 14C, the first 1/4 wave plate 17C, the second 1/4 wave plate 15C, and the partially transmissive and partially reflective element 16C, wherein the second polarizer 14C and the second 1/4 wave plate 15C are respectively disposed as film layers and are respectively attached to both left and right surfaces of the second lens 12C, the partially transmitting partially reflecting element 16C is also provided as a film layer and is attached to the left side surface of the third lens 13C, the first 1/4 wave plate 17C is also provided as a film layer and is attached to the right side surface of the third lens 13C.

Fig. 25 is a schematic diagram of an optical path of a polarization catadioptric micro-projection system 10C according to a fourth embodiment of the present invention. The polarization catadioptric micro-projection system 10C is disposed between a projection light source 20C and a pupil 30C, light emitted from the projection light source 20C first reaches the polarization recovery system 19C, the polarization recovery system 19C converts light from natural light into linearly polarized light, the linearly polarized light includes S light and P light, the P light penetrates through the polarization recovery system 19C, the S light is reflected, the polarization recovery system 19C can convert the reflected S light into the P light again, the amount of the transmitted P light is increased through multiple reflections, the purpose of polarization recovery is achieved, and the use efficiency of the polarization catadioptric micro-projection system 10C for light is further improved.

The light passing through the polarization recycling system 19C is transmitted to the first polarizer 18C, and the polarization state of the light is converted into a single P light by the first polarizer 18C; after passing through the first 1/4 wave plate 17C, the light is converted into circularly polarized light; thereafter, the light is transmitted to the second 1/4 wave plate 15C and converted into linearly polarized light by the second 1/4 wave plate 15C and transmitted; the transmitted light reaches the second polarizer 14C and is reflected on the second polarizer 14C, and the direction of the light is changed; the light after changing direction reaches the second 1/4 wave plate 15C again, is converted into circularly polarized light and is transmitted to the third lens 13C, and is reflected by the surface of the partially transmitting and partially reflecting element 16C on the left side surface of the third lens 13C, and the direction of the light is changed again; the light with the changed direction is transmitted to the second 1/4 wave plate 15C again and then converted into linearly polarized light with the changed vibration direction, and passes through to the pupil 30C.

As shown in fig. 25 to 29, in the fourth embodiment of the present invention, the second polarizer 14C is disposed on the surface of the second lens 12C, and when the light passes through the polarization catadioptric Micro-projection system 10C from the projection light source 20C and reaches the pupil 30C, the entrance pupil diameter entering the pupil 30C is 3mm, the field angle is 40 °, the focal length is 4.5mm, the screen diagonal size of the Micro-LED40 used is 0.13 inch, the resolution is 640 x 480, the effective area size is 2.64 x 2mm, and the pixel size is 4 um.

The maximum effective aperture of the polarization catadioptric micro-projection system 10 is larger than 6.2mm, the total length is 6.8mm, and the distortion is 0.7%.

In this fourth embodiment, the overall aperture and overall length of the polarization catadioptric micro-projection system 10C are increased due to the closer distance of the second polarizer 14C from the partially transmissive partially reflective element 16C compared to the first embodiment described above, but in this embodiment, the use of system components can be reduced due to the integration of more polarizing components as film layers onto the surfaces of the first lens 11C, the second lens 12C and/or the third lens 13C, and the weight of the polarization catadioptric micro-projection system 10C as a whole is reduced due to the reduction of components used.

Preferably, in the polarization catadioptric micro-projection system of the present invention, the material of the first lens 11, the second lens 12 and the third lens 13 includes, but is not limited to, glass, resin or plastic. Preferably, the first lens 11, the second lens 12 and the third lens 13 are made of glass materials, so as to improve the temperature resistance of the polarization catadioptric micro-projection system 10.

Alternatively, the first lens 11, the second lens 12 and the third lens 13 may be made of resin materials, so as to reduce the manufacturing cost of the polarization catadioptric micro-projection system 10.

As described above, in the polarization catadioptric micro-projection system 10 of the present invention, the first lens 11, the second lens 12 and/or the third lens 13 mainly include a transmission surface and a polarization reflection surface, and the surfaces of the polarization reflection surface located at different positions in the polarization catadioptric micro-projection system 10 may change the performance of the polarization catadioptric micro-projection system, for example, a lens position placing the polarization reflection surface too close to or far away from the projection light source 20 may result in the maximum aperture and the total length of the polarization catadioptric micro-projection system 10, and the optimal placement position of the polarization catadioptric micro-projection system 10 (i.e. the surface placing the second polarizer 14) is the middle of the whole polarization catadioptric micro-projection system 10.

Preferably, a second polarizer 14 is disposed as a left side surface of the second lens 12.

As described above, in the first to fourth embodiments of the polarization catadioptric micro-projection system 10 of the present invention, light is preferably reflected twice, but the present invention is not limited to this embodiment, and in the polarization catadioptric micro-projection system 10 of the present invention, the number of times of reflection of light can be adjusted according to the parameters of the polarization catadioptric micro-projection system 10 and the number of lenses, so as to achieve the minimum total length and the best imaging quality of the polarization catadioptric micro-projection system 10.

Preferably, the surface types of the first lens 11, the second lens 12 and the third lens 13 of the present invention include aspheric surface and spherical surface, where the aspheric surface formula is:

wherein c is the surface curvature; k is a conic coefficient;

x and y are coordinates of a point on the aspheric surface; alpha is a polynomial coefficient.

Preferably, in the first to fourth embodiments of the present invention, the first polarizer 18 and the second polarizer 14 are both implemented by attaching a polarizing reflection film on the surface of the first lens 11, the second lens 12 or the third lens 13, but the scope of the present invention is not limited thereto, and the first polarizer 18 and the second polarizer 14 may be provided as separate polarizers by those skilled in the art according to actual circumstances.

In the above first to fourth embodiments of the present invention, the surfaces of the first lens 11, the second lens 12, and the third lens 13 include a flat surface or a curved surface, and the first polarizing plate 18 and the second polarizing plate 14 can be disposed on the flat surface or the curved surface.

Preferably, the first polarizer 18 and the second polarizer 14 are attached to a plane, thereby reducing the processing cost of the first lens 11, the second lens 12, or the third lens 13.

Further, the projection light source 20 includes, but is not limited to, an active light emitting screen such as Micro-LED40 or Micro-OLED.

Preferably, in the polarization catadioptric micro-projection system 10 of the present invention, usable wavelengths include visible light bands and single wavelengths, which all fall within the protection scope of the present invention.

In addition, in the polarization catadioptric micro-projection system 10 of the present invention, the distance d between the pupil 30 and the first lens 11 ranges from 0.1mm to 10 mm. Preferably, the distance d between the pupil 30 and the first lens 11 is 1 mm.

Accordingly, the entrance pupil diameter D of the polarization catadioptric micro-projection system 10 of the present invention is in the range of 2mm to 5 mm. Preferably, the entrance pupil diameter D of the polarization catadioptric micro-projection system 10 is 3 mm.

Further, the focal length of the polarization catadioptric micro-projection system 10 of the present invention is in the range of 1.1mm to 14.3 mm. Preferably, the focal length of the polarization catadioptric micro-projection system 10 is 4.5 mm.

Further, the entrance pupil diameter of the polarization catadioptric micro-projection system 10 and the relation of the focal length are:

the ratio is in the range of 0.17-0.91.

Besides, those skilled in the art can adjust the positions of the various elements in the polarization device of the polarization catadioptric micro-projection system 10 according to the actual situation, so as to change the overall projection effect of the polarization catadioptric micro-projection system 10 by changing the position to which the first polarizer 18 and/or the second polarizer 14 are attached, and so on, all fall within the protection scope of the present invention. In other words, as long as on the above-mentioned basis of disclosing of the utility model, adopted with the same or similar technical scheme of the utility model, solved with the same or similar technical problem of the utility model to reached with the same or similar technological effect of the utility model, all belong to within the protection scope, the utility model discloses a concrete implementation does not use this as the limit.

Furthermore, the number of lenses of the present invention is preferably 3, but the number of lenses of the present invention is not limited, but the number of lenses needs to be as small as possible under the condition that the imaging quality satisfies the requirement in consideration of the principle that the cost and the weight are the lowest. The number of the lenses can be adjusted by those skilled in the art according to actual needs, such as to be adjusted to other numbers, and the like, all falling within the scope of the present invention.

Fig. 30 to 32 are schematic structural views of a polarization-reflective micro-projection apparatus 200 according to a first embodiment of the present invention. The polarization catadioptric Micro-projection device 200 includes a polarization catadioptric Micro-projection mechanism 100 and a waveguide 50, wherein the polarization catadioptric Micro-projection mechanism 100 includes the polarization catadioptric Micro-projection system 10 and a Micro-LED40, wherein the polarization catadioptric Micro-projection system 10 and the Micro-LED40 are packaged together to form the polarization catadioptric Micro-projection mechanism 100.

In the first embodiment of the polarized reflective micro-projection device 200, the waveguide sheet 50 is set as a structure of a glasses lens, the polarized reflective micro-projection mechanism 100 is coupled with the waveguide sheet 50 to make the polarized reflective micro-projection device 200 can be worn by a user, so that the user can wear the polarized reflective micro-projection device 200 on eyes to achieve the effect of augmented reality for images without extra hands or other limbs, and the polarized reflective micro-projection device 200 is grabbed or controlled, thereby improving the convenience of the polarized reflective micro-projection device 200.

Besides, the technicians in this field can be according to the actual conditions to the concrete shape and structure of waveguide piece 50 warp or adjust, for example will waveguide piece 50 sets up to other wearable structures etc. as long as the utility model discloses on the basis of the above-mentioned disclosure, adopted with the same or similar technical scheme of the utility model, solved with the same or similar technical problem of the utility model, and reached with the same or similar technological effect of the utility model, all belong to within the protection scope, the utility model discloses a specific implementation mode does not use this as the limit.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.

Claims (15)

1. A polarization catadioptric micro-projection mechanism, characterized in that the polarization catadioptric micro-projection mechanism comprises a polarization catadioptric micro-projection system and a projection light source, the polarization catadioptric micro-projection system and the projection light source are packaged together, wherein the polarization-catadioptric micro-projection system comprises at least one polarization recovery system, a first polarizer, a first 1/4 wave plate, a partially transmissive and partially reflective element, a second 1/4 wave plate, a second polarizer, and a plurality of lenses, the polarization recovery system, the first polarizer, the first 1/4 wave plate, the partially transmissive and partially reflective element, the second 1/4 wave plate and the second polarizer are sequentially arranged and respectively disposed on different surfaces of the lens, so that the utilization rate of light rays is improved.

2. The polarization catadioptric micro-projection mechanism of claim 1, wherein the plurality of lenses includes a first lens, a second lens, and a third lens, the second lens is disposed between the first lens and the third lens, the partially transmissive partially reflective element is disposed between the third lens and the polarization recovery system, the second polarizer and the second 1/4 wave plate are disposed as films and attached to both side surfaces of the second lens, respectively, the first 1/4 wave plate and the first polarizer are also disposed as films and are sequentially disposed on the surface of the partially transmissive partially reflective element.

3. The polarization catadioptric micro-projection mechanism of claim 1, wherein the plurality of lenses includes a first lens, a second lens, and a third lens, the second lens is disposed between the first lens and the third lens, the partially transmissive partially reflective element is disposed between the third lens and the polarization recovery system, the second polarizer and the second 1/4 wave plate are disposed as films and attached to both side surfaces of the first lens, respectively, the first 1/4 wave plate and the first polarizer are also disposed as films and attached to a surface of the partially transmissive partially reflective element in sequence.

4. The polarization catadioptric micro-projection mechanism of claim 1, wherein the plurality of lenses includes a first lens, a second lens, and a third lens, the second lens is disposed between the first lens and the third lens, the partially transmissive partially reflective element is disposed between the third lens and the polarization recovery system, the second polarizer and the second 1/4 wave plate are disposed as films and attached to both side surfaces of the third lens, respectively, the first 1/4 wave plate and the first polarizer are also disposed as films and attached to a surface of the partially transmissive partially reflective element in sequence.

5. The polarization catadioptric micro-projection mechanism of claim 1, wherein the plurality of lenses includes a first lens, a second lens, and a third lens, the second lens is disposed between the first lens and the third lens, the partially transmissive partially reflective element is disposed between the third lens and the polarization recovery system, the second polarizer and the second 1/4 wave plate are disposed as films and attached to left and right surfaces of the second lens, respectively, the partially transmissive partially reflective element is also disposed as a film and attached to a left surface of the third lens, and the first 1/4 wave plate is also disposed as a film and attached to a right surface of the third lens.

6. The polarization catadioptric micro-projection mechanism of any one of claims 2 to 5, wherein surfaces of the first, second, and third lenses comprise spherical and aspherical surfaces, wherein the aspherical formula is:

wherein c is the surface curvature; k is a conic coefficient;

x and y are coordinates of a point on the aspheric surface; alpha is a polynomial coefficient.

7. The polarization catadioptric micro-projection mechanism of any one of claims 2 to 5, wherein surfaces of the first, second, and third lenses comprise a flat or curved surface, the first and second polarizers being attachable to the surfaces of the first, second, and third lenses.

8. The polarization-catadioptric micro-projection mechanism of claim 7, wherein the polarization-catadioptric micro-projection system is disposed in front of a pupil such that light from the projection light source passes through the polarization-catadioptric micro-projection system and is reflected by the polarization-catadioptric micro-projection system to the pupil.

9. The polarization catadioptric Micro-projection mechanism of claim 1, wherein the projection light source is a Micro-LED or a Micro-OLED.

10. A polarization catadioptric micro-projection apparatus, comprising a polarization catadioptric micro-projection mechanism and a waveguide, the polarization catadioptric micro-projection mechanism being coupled to the waveguide, wherein the polarization catadioptric micro-projection mechanism comprises a polarization catadioptric micro-projection system and a projection light source, the polarization catadioptric micro-projection system and the projection light source being packaged together, wherein the polarization catadioptric micro-projection system comprises at least a polarization recycling system, a first polarizer, a first 1/4 plate, a partially transmissive and partially reflective element, a second 1/4 plate, a second polarizer and a plurality of lenses, wherein the polarization recycling system, the first polarizer 1/4, the partially transmissive and partially reflective element, the second 1/4 plate and the second polarizer are sequentially arranged and respectively disposed without being disposed The surface of the lens improves the utilization rate of light and achieves the effect of augmented reality.

11. The polarized-catadioptric micro-projection device of claim 10, wherein the plurality of lenses includes a first lens, a second lens, and a third lens, the second lens is disposed between the first lens and the third lens, the partially transmissive partially reflective element is disposed between the third lens and the polarization recovery system, the second polarizer and the second 1/4 are disposed as films and attached to both side surfaces of the second lens, respectively, the first 1/4 wave plate and the first polarizer are also disposed as films and sequentially disposed on the surface of the partially transmissive partially reflective element.

12. The polarization-catadioptric micro-projection device of claim 10, wherein the plurality of lenses comprises a first lens, a second lens, and a third lens, the second lens disposed between the first lens and the third lens, the partially transmissive partially reflective element disposed between the third lens and the polarization recovery system, the second polarizer and the second 1/4 wave plate disposed as films and attached to both side surfaces of the first lens, respectively, the first 1/4 wave plate and the first polarizer disposed as films and attached to a surface of the partially transmissive partially reflective element in sequence.

13. The polarization-catadioptric micro-projection device of claim 10, wherein the plurality of lenses comprises a first lens, a second lens, and a third lens, the second lens is disposed between the first lens and the third lens, the partially transmissive partially reflective element is disposed between the third lens and the polarization recovery system, the second polarizer and the second 1/4 wave plate are disposed as films and attached to both side surfaces of the third lens, respectively, the first 1/4 wave plate and the first polarizer are also disposed as films and attached to surfaces of the partially transmissive partially reflective element in sequence.

14. The polarization-catadioptric micro-projection device of claim 10, wherein the plurality of lenses comprises a first lens, a second lens, and a third lens, the second lens disposed between the first lens and the third lens, the partially transmissive partially reflective element disposed between the third lens and the polarization recovery system, the second polarizer and the second 1/4 wave plate disposed as films and attached to left and right surfaces of the second lens, respectively, the partially transmissive partially reflective element also disposed as a film and attached to a left surface of the third lens, and the first 1/4 wave plate also disposed as a film and attached to a right surface of the third lens.

15. The polarized mirrored micro-projection arrangement of any of claims 10-14, wherein the waveguide plate is in the shape of a spectacle lens.

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