A projection optical machine device and AR display device

Abstract

The present invention discloses a projection optical machine device, including a light source component, an image source component, a projection lens and a deflection reflector; wherein the light source component is used to output illumination light; the image source group is used to form a projection light output with a projection image; the deflection reflector is arranged on the output light path of the image source component, and is used to make the projection light incident on the deflection reflector at a predetermined angle, and reflect the outgoing projection light in a predetermined direction; the projection lens is arranged on the output light path of the deflection reflector, and is used to transmit the projection light for output. The present application adds a deflection reflector between the image source component and the projection lens of the projection optical machine, and the projection light emitted by the projection optical machine meets the requirements of the incident angle of the incident projection light of the waveguide element, which improves the compactness of the structure of the AR display device using the projection optical machine of the present application to a certain extent, and is conducive to the miniaturization development of the AR display device. The present application also provides an AR display device with the above-mentioned beneficial effects.

Description

Technical Field

[0001] The present invention relates to the technical field of optical devices, and in particular to a projection optical machine device and an AR display device. Background Art

[0002] The AR display device mainly consists of two parts. The first part is a projection light machine that outputs projection light carrying the display image, and the second part is a waveguide element that guides the projection light into the human eye. The projection light machine includes three different color light sources: red, blue, and green. It also combines the light output by the light source to form a white light beam, and various optical path elements that guide the white light beam into a chip with image information and reflect the projection light from the chip surface.

[0003] It can be seen that for the entire AR display device, the number of optical path components contained in its projection optical machine, waveguide components, etc. is large and the optical path is complex, resulting in a large space volume of the assembled AR display device, which affects the user experience. Therefore, how to improve the compactness of the optical path structure such as the projection optical machine and waveguide components in the AR display device, and then reduce the volume of the AR display device, is one of the problems that urgently need to be solved in the industry. Summary of the invention

[0004] The purpose of the present invention is to provide a projection optical machine device and an AR display device, which reduce the length of the projection optical machine and reduce the space where the projection optical machine is located.

[0005] In order to solve the above technical problems, the present invention provides a projection optical machine device, including a light source component, an image source component, a projection lens and a deflection reflector;

[0006] The light source assembly is used to output illumination light; the image source assembly is located on the outgoing light path of the light source assembly, and is used to output projection light with a projection image formed by the incident illumination light;

[0007] The deflection reflector is arranged on the output light path of the image source component, and is used to make the projection light incident on the deflection reflector at a predetermined angle, and reflect the projection light in a predetermined direction;

[0008] The projection lens is arranged on the output light path of the deflection reflector, and is used for transmitting and outputting the projection light.

[0009] In an optional embodiment of the present application, it further includes an optical path deflection element;

[0010] The light source assembly and the image source assembly are divided into two layers and arranged in parallel, and the optical path deflection element is arranged on the output optical path of the light source assembly and the input optical path of the image source assembly; the optical path deflection element is used to deflect the direction of the illumination light output by the light source assembly by 180 degrees and then make it incident on the image source assembly.

[0011] In an optional embodiment of the present application, the optical path deflection element includes a first reflector arranged on the outgoing optical path of the light source assembly, and a second reflector arranged on the outgoing optical path of the first reflector; the image source assembly is arranged on the outgoing optical path of the second reflector;

[0012] Wherein, the direction of the light from the light source assembly incident on the first reflector and the direction of the light reflected from the second reflector are parallel to each other and in opposite directions.

[0013] In an optional embodiment of the present application, the first reflector and the second reflector are perpendicular to each other, and the first reflector and the direction of the light emitted by the light source assembly form an angle of 45 degrees.

[0014] In an optional embodiment of the present application, the optical path deflection element is a prism.

[0015] In an optional embodiment of the present application, the light source assembly includes a green light source, a red and blue light source, and a spectroscopic filter; the direction of light output by the green light source and the direction of light output by the red and blue light source are perpendicular to each other, and the light is combined and output through the spectroscopic filter.

[0016] In an optional embodiment of the present application, the image source component includes a polarization beam splitter and an LCOS image source; the deflection reflector is arranged on an output light path of the polarization beam splitter;

[0017] Alternatively, the image source component includes a DMD image source and a prism; and the deflection reflector is arranged on the output light path of the prism.

[0018] The present application also provides an AR display device, characterized in that it includes a projection optical device as described in any of the above items, and a waveguide element arranged on the output light path of the projection optical device.

[0019] In an optional embodiment of the present application, the AR display device is AR glasses, the waveguide element is a waveguide lens, and the projection optical device is arranged inside the frame of the AR glasses.

[0020] A projection optical machine device provided by the present invention includes a light source component, an image source component, a projection lens and a deflection reflector; wherein the light source component is used to output illumination light; the image source component is located on the output light path of the light source component, and is used to output projection light with a projection image formed by the incident illumination light; the deflection reflector is arranged on the output light path of the image source component, and is used to make the projection light incident on the deflection reflector at a predetermined angle and reflect the outgoing projection light in a predetermined direction; the projection lens is arranged on the output light path of the deflection reflector, and is used to transmit the projection light for output.

[0021] The present application adds a deflection reflector between the image source component and the projection lens of the projection optical machine, and the directions of the projection light output by the deflection reflector and the image source component form a specific angle, so that the deflection reflector can reflect the emitted projection light in a predetermined direction. Then, in display devices such as AR glasses, the angle between the deflection reflector and the projection light can be set so that the direction in which the projection light is finally emitted by the projection optical machine meets the requirements of the waveguide element for the incident angle of the incident projection light. There is no need to set an optical element similar to a prism between the waveguide element and the projection optical machine. This improves the compactness of the structure of the AR display device using the projection optical machine of the present application to a certain extent, which is conducive to the miniaturization of AR display devices.

[0022] The present application also provides an AR display device having the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic diagram of the structure of AR glasses in the prior art;

[0025] Figure 2 It is a schematic diagram of the optical path structure of a projection optical machine in the prior art;

[0026] Figure 3 A schematic diagram of the structure of a projection optical machine device provided in an embodiment of the present application;

[0027] Figure 4 A schematic diagram of the side view structure of the projection optical mechanical device provided in an embodiment of the present application;

[0028] Figure 5 A schematic diagram of wearing AR glasses provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] Existing AR display devices, such as Figure 1 AR glasses, Figure 1 The schematic diagram of the structure of AR glasses in the prior art is that the waveguide lens 06 is composed of two waveguides. Generally, the display effect is best when the main light of the projector 10 is incident on the waveguide lens 06 (that is, the main light of the projector is incident perpendicular to the surface of the waveguide lens 06). However, when the waveguide lens 06 is assembled on the AR glasses as a lens, in order to meet the wearing comfort, the waveguide lens 06 and the temple 07 are usually not arranged perpendicularly.

[0030] like Figure 2 As shown, Figure 2 Schematic diagram of the optical path structure of the projection optical machine in the prior art. For the conventional existing projection optical machine 10, its optical path is basically straight. When the projection optical machine 10 is set in the temple 07 of the AR glasses, the main light direction of the output projection light is basically the same as the length direction of the temple 07. Obviously, the main light of the projection light output by the projection optical machine 10 set in the temple 07 cannot be vertically incident on the waveguide lens 06. In order to ensure that the main light of the projector can be incident vertically on the surface of the waveguide lens 06, a switching prism 08 is required to realize the main light of the projection optical machine 10 is incident on the waveguide surface, which increases the complexity of the AR glasses structure and thus increases the volume and cost of the AR glasses.

[0031] Similarly, when the projection optical machine 10 is applied to other AR display devices, or when it is installed in a non-tip part of AR glasses, the main light of the projection light is often not perpendicular to the waveguide surface, and the projection light direction needs to be adjusted with the help of a turning optical element such as the switching prism 08. This increases the complexity of the structure of the AR display device and the space volume occupied, and increases the cost.

[0032] To this end, the present application provides a projection optical machine device, the angle of which the output projection light can be set according to the needs of the waveguide element, without the need to set optical elements such as prisms between the projection optical machine and the waveguide element, making the structure of the AR display device more compact, which is conducive to the miniaturization of the AR display device.

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figures 3 to 5 As shown, Figure 3A schematic diagram of the structure of a projection optical machine device provided in an embodiment of the present application; Figure 4 A schematic diagram of the side view structure of the projection optical mechanical device provided in an embodiment of the present application; Figure 5 A schematic diagram of wearing AR glasses provided in an embodiment of the present application. The projection optical machine device provided in the present application may include:

[0035] Light source component 1, image source component 2, projection lens 24 and deflection reflector 23;

[0036] The light source component 1 is used for illuminating light; the image source component 2 is located on the outgoing light path of the light source component 1 and is used for converting the incident illuminating light into a projection light with a projection image for output;

[0037] The deflection reflector 23 is arranged on the output light path of the image source component 2, and is used to make the projection light incident on the deflection reflector 23 at a predetermined angle, and reflect the outgoing projection light in a predetermined direction;

[0038] The projection lens 24 is disposed on the output light path of the deflection reflector 23 and is used to transmit and output the projection light.

[0039] It can be understood that the reflector has the function of changing the transmission direction of the light path. In the present application, a deflection reflector 23 is set on the output light path of the image source component 2, which can also achieve the deflection of the light path of the projection light output by the image source component 2 to a certain extent.

[0040] like Figure 3 As shown, the present application sets a deflection mirror 23 on the output light path of the image source component, and the direction of the deflection mirror 23 can be set according to the relative position of the waveguide unit with respect to the projection optical machine 10. Figure 5 As shown, when the projection light engine 10 is applied to AR glasses and installed in the temples of the AR glasses, the angle of the deflection reflector 23 relative to the projection light can be set according to the direction of the projection light output by the image source component 2 of the projection light engine 10 and the angle between the waveguide lens 06, so that the projection light is incident at the angle required by the waveguide lens 06, and there is no need to add optical elements such as prisms. This improves the compactness of the structure of the AR display device when the projection light engine 10 is applied to the AR display device to a certain extent, which is conducive to the miniaturization of the AR display device.

[0041] In addition, in order to ensure the clarity of the image formed by the output projection light through the waveguide element in the human eye, the optical axis of the projection lens 24 and the optical axis of the deflection mirror 23 reflecting the projection light should be made to coincide.

[0042] To summarize, in the present application, a deflecting reflector 23 is added to the projection light machine 10, and the angle of the deflecting reflector 23 relative to the projection light is set to achieve a directional output of the projection light by the projection light machine 10. Therefore, when the projection light machine 10 is actually applied to an AR display device, there is no need to add other optical elements between the projection light machine 10 and the waveguide element, thereby increasing the compactness of the structure of the AR display device and facilitating the miniaturization of the AR display device.

[0043] Based on the above embodiments, Figure 2 As shown, in the conventional AR display device projection optical machine 10, the light output by the red light source 01, the blue light source 02 and the green light source 03 are combined and then outputted after passing through the PBS 04, the image display chip 05 and other optical components in sequence. The entire optical path structure is a linear structure, which makes the projection optical machine 10 occupy a larger space volume in the length direction. Figure 1 The projection optical machine 10 is arranged in the temple 07 of the AR glasses. Because the projection optical machine 10 needs to occupy a certain space length, the part of the temple 07 for accommodating the projection optical machine 10 is relatively large, which on the one hand increases the volume of the temple 07, and on the other hand makes the temple 07 squeeze the temple of the wearer's head, which brings an uncomfortable use experience to the user and affects the folding of the temple 07.

[0044] To this end, in an optional embodiment of the present application, the projection optical machine 10 may further include:

[0045] Optical path deflection element 3;

[0046] The light source component 1 and the image source component 2 are divided into two layers and arranged in parallel. The optical path deflection element 3 is arranged on the output optical path of the light source component 1 and the input optical path of the image source component 2; the optical path deflection element 3 is used to deflect the direction of the illumination light output by the light source component 1 by 180 degrees and then make it incident on the image source component 2.

[0047] In this embodiment, the optical path structure of the entire projection optical machine 10 is divided into two parts, one part is the light source component 1 and the other part is the image source component 2 , and an optical path deflection element 3 is also provided between the light source component 1 and the image source component 2 .

[0048] Compared with the prior art, the light source assembly 1 and the image source assembly 2 in the present application are not arranged in a straight line, but are stacked in an upper and lower layer structure. Figure 3 and Figure 4As shown, in the present application, the light source component 1 and the image source component 2 are arranged in upper and lower layers. Accordingly, the output optical axis of the light source component 1 and the optical axis of the image source component 2 are parallel to each other. An optical path deflection element 3 is arranged at the same end of the light source component 1 and the image source component 2. The optical path deflection element 3 can deflect the optical path of the combined light beam output by the light source component 1 by 180 degrees, and make the entire light beam translate to the optical axis of the image source component 2.

[0049] Depend on Figure 2 and Figure 3 It can be seen from the optical path structure shown that, compared with the prior art, the optical path structure of the entire projection optical machine 10 in this embodiment is equivalent to folding the entire linear optical path from the middle of the optical path, and realizing this deflection through the optical path deflection element 3. This reduces the length of the entire projection optical machine device along the optical axis by half. Because the length of the projection optical machine device is reduced, when the projection optical machine 10 is set in the temple 07 of the AR glasses, the part that accommodates the projection optical machine 10 does not extend to the temple position of the wearer, and thus does not cause squeezing of the wearer's head, which is conducive to improving the comfort of the wearer using the AR glasses and facilitates the folding function of the temple 07.

[0050] Of course, the projection optical device provided in the present application is not limited to use in AR glasses, but can also be applied to other devices that include a projection optical device and have restrictions on the installation length of the projection optical device.

[0051] To sum up, in this embodiment, the entire optical path of the projection optical machine device is divided into two parts: a light source component and an image source component, and the two parts of the optical path are folded, and the light beam is deflected at the optical path deflection position through an optical path deflection element, thereby making the length of the entire projection optical machine device along the optical axis less than half, making the structure of the entire projection optical machine device more compact, which is conducive to the projection optical machine adapting to various installations similar to AR glasses, thereby improving the user experience.

[0052] Based on the above embodiment, in an optional embodiment of the present application, the optical path deflection element 3 includes a first reflector 31 arranged on the outgoing optical path of the light source assembly 1, and a second reflector 32 arranged on the outgoing optical path of the first reflector 31; the image source assembly 2 is arranged on the outgoing optical path of the second reflector 32;

[0053] The direction of the light from the light source assembly 1 incident on the first reflector 31 and the direction of the light reflected from the second reflector 32 are parallel to each other and in opposite directions.

[0054] like Figure 3 and Figure 4As shown, in the present application, the combined light beam output by the light source component 1 is deflected twice by the first reflector 31 and the second reflector 32, so that the transmission direction of the output light beam of the light source component 1 is deflected by 180 degrees and incident on the image source component 2. For example, the first reflector 31 and the second reflector 32 can be perpendicular to each other, and the combined light beam output by the light source component 1 is incident on the first reflector 31 at an incident angle of 45 degrees, and is reflected from the first reflector 31 to the second reflector 32. Obviously, the combined light beam is reflected by the first reflector 31, and the optical path is deflected by 90 degrees, and the incident angle of the combined light beam incident on the second reflector 32 is 45 degrees, so that the combined light beam is reflected by the second reflector 32, and then the combined light beam is deflected by 90 degrees again and incident on the image source component 2.

[0055] Of course, it is understandable that the first reflector 31 and the second reflector 32 are not necessarily arranged perpendicular to each other. Accordingly, the angle at which the combined light beam output by the light source assembly 1 is incident on the first reflector 31 and the second reflector 31 is not necessarily 45 degrees, as long as the directions of the light beams finally incident on the first reflector 31 and exiting the second reflector 32 are opposite.

[0056] In another optional embodiment of the present application, the optical path deflection element 3 may be a prism, and the combined light beam is deflected 180 degrees by multiple reflections of the combined light beam by various surfaces of the prism. The prism may be a right-angle prism or other prisms, and this is not specifically limited in the present application.

[0057] The light source assembly in the present application mainly outputs light obtained by combining red light, green light and blue light. To this end, the light source assembly 1 may specifically include:

[0058] A green light source 11 , a red and blue light source 12 and a spectroscopic filter 13 ; the light directions output by the green light source 11 and the red and blue light source 12 are perpendicular to each other, and are combined and output through the spectroscopic filter 13 .

[0059] In order to reduce the number of optical elements of the entire light source assembly 1 as much as possible, and thus reduce the space volume of the projection optical machine device, the red light source and the blue light source adopt a red-blue light source 12 that can output red light beams and blue light beams at the same time. When combining light, it is only necessary to combine the red, blue light and the green light through the dichroic filter 13.

[0060] In addition, in order to increase the uniformity of the color mixing of the combined light output by the light source assembly 1, a fly-eye lens 14 may be further arranged on the output light path of the spectroscopic filter.

[0061] Of course, the light source assembly 1 is not limited to this optical path structure. For example, the combined light of red light and green light is yellow light, so a yellow light source and a blue light source can be used to combine two light sources to obtain a combined light beam. Of course, the light source assembly 1 can directly use a white light source to further reduce the number of optical elements of the entire light source assembly 1. There are also similar technical solutions that are not listed one by one in this application.

[0062] Based on any of the above embodiments, in an optional embodiment of the present application, the image source component 2 includes a polarization beam splitter 21 and a LOCS image source 22 , and the deflection mirror 23 is arranged on the output light path of the polarization beam splitter 21 .

[0063] like Figure 3 and Figure 4 As shown, the fly-eye lens 14 is arranged on the output light path of the spectroscopic filter 13, and the light beams output by the various color light sources are combined by the spectroscopic filter 13 and then incident on the light path deflection element 3 through the fly-eye lens 14, and are incident on the polarization beam splitter 21 through the light path deflection element 3, and are incident on the image display chip 22 through the splitting surface of the polarization beam splitter 21, and a projection light beam carrying the projected image is reflected from the surface of the image display chip 22, and the projection light beam is output to the deflection reflector 23 through the polarization beam splitter 22.

[0064] The image source component 2 is not limited to the polarization beam splitter 21 and the LOCS image source 22, for example, it can also include a DMD image source and a prism; similarly, the deflection reflector 23 is arranged on the output light path of the prism. The image source component in the present application can also be other structures, and there is no specific limitation on this in the present application.

[0065] The present application also discloses an AR display device, which includes a projection optical device as described in any one of the above items, and a waveguide element arranged on the output light path of the projection optical device.

[0066] refer to Figure 5 The AR display device can be an AR glasses, the waveguide unit is a waveguide lens, the projection optical device is arranged in the temple of the AR glasses or above the lens or other positions of the frame, and the projection light output by the projection optical device is incident on the waveguide lens 06 and is guided into the human eye by the waveguide lens 06, so that the wearer can view the projected display image.

[0067] The projection optical machine device of the present application has a smaller length dimension than a conventional projection optical machine, making the structure of the projection optical machine device more compact, thereby reducing the space occupied by the projection optical machine device in the length direction to a certain extent, which is conducive to the miniaturization of AR display equipment.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment that includes a series of elements are inherent to the elements. In the absence of more restrictions, the elements limited by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or equipment that includes the elements. In addition, the above-mentioned technical solution provided in the embodiment of the present application is consistent with the corresponding technical solution in the prior art in principle, and the part is not described in detail, so as not to repeat too much.

[0069] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A projection optical machine device, characterized in that: The projection optical machine device is applied to AR glasses and installed in the temples of the AR glasses; it includes a light source component, an image source component, a projection lens and a deflection reflector; The light source assembly is used to output illumination light; the image source assembly is located on the outgoing light path of the light source assembly, and is used to output projection light with a projection image formed by the incident illumination light; The deflection reflector is arranged on the output light path of the image source component, and is used to make the projection light incident on the deflection reflector at a predetermined angle, and reflect the projection light in a predetermined direction; The projection lens is arranged on the output optical path of the deflection reflector, and is used to transmit and output the projection light, so that the projection light output by the projection optical machine device is incident on the waveguide element at a required angle of the waveguide element; Also included is an optical path deflection element; The light source assembly and the image source assembly are divided into two layers and arranged in parallel, and the optical path deflection element is arranged on the output optical path of the light source assembly and the input optical path of the image source assembly; the optical path deflection element is used to deflect the direction of the illumination light output by the light source assembly by 180 degrees and then incident on the image source assembly; The optical path deflection element comprises a first reflector arranged on the outgoing optical path of the light source assembly, and a second reflector arranged on the outgoing optical path of the first reflector; the image source assembly is arranged on the outgoing optical path of the second reflector; wherein the direction of the light from the light source assembly incident on the first reflector and the direction of the reflected outgoing light from the second reflector are parallel to each other and in opposite directions; The first reflector and the second reflector are perpendicular to each other, and the first reflector and the direction of the light emitted by the light source assembly form an angle of 45 degrees; Or, the optical path deflection element is a prism; The light source assembly includes a green light source, a red and blue light source, and a spectroscopic filter; the light direction output by the green light source and the light direction output by the red and blue light source are perpendicular to each other, and the light is combined and output through the spectroscopic filter.

2. The projection optical machine device according to claim 1, characterized in that: The image source component includes a polarization beam splitter and an LCOS image source; the deflection reflector is arranged on the output light path of the polarization beam splitter; Alternatively, the image source component includes a DMD image source and a prism; and the deflection reflector is arranged on the output light path of the prism.

3. An AR display device, characterized in that: It comprises the projection optical mechanical device as described in any one of claims 1 to 2, and a waveguide element arranged on the output light path of the projection optical mechanical device.

4. The AR display device according to claim 3, characterized in that: The AR display device is AR glasses, the waveguide element is a waveguide lens, and the projection optical device is arranged inside the frame of the AR glasses.

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