A bifocal display device and augmented reality apparatus

Abstract

The application provides a bifocal display device and an augmented reality device, and relates to the technical field of virtual reality, and comprises an image group, a polarization light splitting group and an exit group which are sequentially arranged along an optical path; the polarization light splitting group is used for dividing light emitted by the image group into a first split beam and a second split beam to be incident on a first optical path and a second optical path respectively; a parallax element is arranged in the second optical path; the second split beam is coupled into the exit group at different angles with the first split beam after the exit angle of the second split beam is adjusted by the parallax element, and is respectively emitted to different focal planes by the exit group. The angle of the second split beam coupled into the exit group with the first split beam is different through the parallax element, the human eye enters from different directions through the exit group, so that the image seen by the human eye is located in different focal planes, the fatigue of the human eye caused by observing the image in the same focal plane is relieved, and the visual experience of the user is improved.

Description

Technical Field

[0001] This application relates to the field of virtual reality technology, and more specifically, to a dual-focal-plane display device and an augmented reality device. Background Technology

[0002] AR (Augmented Reality) glasses are smart wearable devices that seamlessly integrate digital information with the real world. Through built-in cameras, sensors, and transparent displays, they can identify the user's physical environment in real time and overlay and accurately anchor virtual text, images, 3D models, and other digital content onto the real world, thereby enabling interactive interaction between the virtual and real worlds on the same screen.

[0003] Existing AR glasses typically only display virtual images on a fixed focal length plane, causing distant and near scenes to overlap on the same visual plane. This makes it difficult for users to adjust their focus naturally, leading to visual fatigue. Utility Model Content

[0004] The purpose of this application is to address the shortcomings of the prior art by providing a dual-focal-plane display device and an augmented reality device to solve the aforementioned problems.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows: One aspect of this application provides a dual-focal-plane display device, comprising: an image group, a polarization beam splitter, and an emission group arranged sequentially along an optical path; the polarization beam splitter is used to divide the light emitted from the image group into a first beam and a second beam to be incident on the first optical path and the second optical path respectively; a parallax element is provided in the second optical path, and the second beam is coupled into the emission group at a different angle with the first beam after the emission angle is adjusted by the parallax element, and then emitted from the emission group to different focal planes respectively.

[0006] Optionally, the parallax element includes a prism or a mirror for forming a preset angle between the second beam and the first beam.

[0007] Optionally, the parallax element is a prism, and the angle between the light-emitting surface of the prism and the optical axis of the second beam splitter in the propagation direction of the polarization beam splitter is α, where 10°≤α≤80°.

[0008] Optionally, the parallax element is adjacent to the polarization beam splitter.

[0009] Optionally, the image group includes an image source with an LED light source, and different display areas of the image source are respectively fitted with a first polarizer and a second polarizer, the polarization directions of the first polarizer and the second polarizer being different.

[0010] Optionally, the image group includes an image source having an LD light source, and a phase delay film is attached to a portion of the display area of ​​the image source. The phase delay film is used to adjust the polarization state of the polarized light emitted by the image source.

[0011] Optionally, the output assembly includes an optical waveguide, a prism, or a freeform surface element.

[0012] Optionally, when the output group is an optical waveguide, an output grating is provided in a portion of the optical waveguide.

[0013] Optionally, the dual-focal-plane display device further includes a collimating element, a reflecting element, and / or an imaging assembly, which are located between the image group and the polarization beam splitter group.

[0014] In another aspect of this application, an augmented reality device is provided, including the aforementioned dual-focal-area display device and wearable component, wherein the dual-focal-area display device and wearable component are fixedly connected.

[0015] The beneficial effects of this application include: This application provides a dual-focal-plane display device, comprising: an image group, a polarization beam splitter, and an exiting group arranged sequentially along an optical path; the polarization beam splitter divides the light emitted from the image group into a first beam and a second beam, the first beam and the second beam respectively entering the first optical path and the second optical path; a parallax element is provided in the second optical path, and the second beam, after its exit angle is adjusted by the parallax element, couples with the first beam at different angles into the exiting group, and exits to different focal planes. By adjusting the angle at which the second beam and the first beam couple into the exiting group are different through the parallax element, and entering the human eye from different directions through the exiting group, the images seen by the human eye are located on different focal planes, alleviating eye fatigue caused by observing images within the same focal plane and improving the user's visual experience. Attached Figure Description

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Figure 1 This is a schematic diagram of the structure of a dual-focal-plane display device provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the parallax device provided in the embodiments of this application; Figure 3 This is one of the structural schematic diagrams of the image group provided in the embodiments of this application; Figure 4This is a second schematic diagram of the structure of the image group provided in the embodiments of this application.

[0018] Icons: 100-Dual-focal-plane display device; 110-Image group; 111-Image source; 112-First polarizer; 113-Second polarizer; 114-Phase retardation plate; 120-Polarization beam splitter; 130-Outgoing beam group; 131-Optical waveguide; 132-Outgoing grating; 140-First beam splitter; 150-Second beam splitter; 160-Parallelism element; 170-Collimation element; 180-Reflection element; 190-Imaging assembly. Detailed Implementation Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. It should be noted that, unless otherwise specified, the various features in the embodiments of this application can be combined with each other, and the combined embodiments are still within the protection scope of this application.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0022] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] like Figure 1 As shown, one aspect of this application provides a dual-focal-plane display device 100, including: an image group 110, a polarization beam splitter group 120, and an emission group 130 arranged sequentially along an optical path; the polarization beam splitter group 120 is used to divide the light emitted from the image group 110 into a first beam 140 and a second beam 150 so that they are respectively incident on the first optical path and the second optical path; a parallax element 160 is provided in the second optical path, and the second beam 150 is coupled into the emission group 130 at different angles with the first beam 140 after the emission angle is adjusted by the parallax element 160, and is respectively emitted to different focal planes by the emission group 130.

[0024] Specifically, the dual-focal-plane display device 100 includes an image group 110, a polarization beam splitter group 120, and an emission group 130 arranged sequentially along the optical path. It should be noted that the image group 110 is located at the beginning of the entire optical path, and the emitted light can carry image information; the polarization beam splitter group 120 can split the incident light according to the polarization state, separating it into two orthogonal linearly polarized beams, so that the two beams enter two different optical paths from different output ends; the emission group 130 is located at the end of the optical path, and it can guide the beam to the human eye.

[0025] The light emitted from image group 110 enters polarization beam splitter 120. It should be noted that the light emitted from image group 110 has two polarization states (the different polarization states are described in detail below). The two polarization states of light are split into a first beam 140 and a second beam 150 by polarization beam splitter 120. Specifically, the two polarization states of light undergo transmission and reflection respectively after entering polarization beam splitter 120. The first beam 140 and the second beam 150 exit from different output ends of polarization beam splitter 120 and enter the first optical path and the second optical path respectively. A parallax element 160 is provided in the second optical path, which can adjust the exit angle of the incident beam. After passing through parallax element 160, the second beam 150 enters exit group 130 at an exit angle different from that of the first beam 140. The first beam 140 and the second beam 150 exit from exit group 130 to different focal planes. By adjusting the angles of the second beam splitter 150 and the first beam splitter 140 coupled into the emission group 130 using the parallax element 160, the images seen by the human eye are located on different focal planes, which alleviates visual fatigue and improves the user's visual experience.

[0026] When image group 110 emits light with two polarization states, the light enters polarization beam splitter 120 and is transmitted and reflected respectively, for example, p-light transmission and s-light reflection, or s-light transmission and p-light reflection, which divides the light into a first beam 140 and a second beam 150. The first beam 140 is transmitted through polarization beam splitter 120 and enters the human eye through exit group 130; the second beam 150 is reflected and enters parallax element 160. After adjustment by parallax element 160, the angle at which the second beam 150 enters the exit group 130 is different from the angle at which the first beam 140 enters the exit group 130, and the second beam 150 enters the human eye through exit group 130. Because the first beam 140 and the second beam 150 enter the human eye at different angles, the image seen by the human eye is located on different focal planes, that is, the image is displayed on a dual focal plane, which alleviates eye fatigue caused by observing an image within the same focal plane and also improves the stereoscopic effect of the image.

[0027] In some embodiments, the polarization beam splitter 120 is a polarization beam splitter prism, also known as a polarization beam splitter.

[0028] Optionally, such as Figure 1 and Figure 2 As shown, the parallax element 160 includes a prism or a reflector for forming a preset angle between the second beam splitter 150 and the first beam splitter 140.

[0029] Specifically, the parallax element 160 can be a prism or a mirror, and the second beam splitter 150 forms an exit angle different from that of the first beam splitter 140 after passing through the prism or mirror. That is, a preset angle is formed between the second beam splitter 150 and the first beam splitter 140. The preset angle refers to the angle between the optical axis of the second beam splitter 150 in the exit direction of the parallax element 160 and the optical axis of the first beam splitter 140 in the exit direction of the polarization beam splitter group 120.

[0030] Optionally, such as Figure 2 As shown, the parallax element 160 is a prism, and the angle between the light-emitting surface of the prism and the optical axis of the second beam splitter 150 in the propagation direction of the polarization beam splitter 120 is α, where 10°≤α≤80°.

[0031] Specifically, when the parallax element 160 is a prism, the second beam 150 enters the prism and is reflected before exiting from the emitting surface, which is an inclined surface. For example... Figure 2 As shown, 'a' is the angle between the light-emitting surface of the prism and the optical axis of the second beam splitter 150 in the propagation direction of the polarization beam splitter 120. In order to make the images entering the human eye located on different focal planes and to make the images seen by the human eye have a sense of layering, 'a' can satisfy: 10°≤a≤80°.

[0032] Optionally, such as Figure 1 As shown, the parallax element 160 is adjacent to the polarization beam splitter 120.

[0033] Specifically, the parallax element 160 is adjacent to the polarization beam splitter 120, which makes the overall size of the device more compact.

[0034] Optionally, such as Figure 1 and Figure 3 As shown, the image group 110 includes an image source 111, which has an LED light source. Different display areas of the image source 111 are respectively attached with a first polarizer 112 and a second polarizer 113, and the polarization directions of the first polarizer 112 and the second polarizer 113 are different.

[0035] Specifically, the polarization beam splitter 120 can split light rays with different polarization states into a first beam 140 and a second beam 150. Therefore, the light emitted by the image group 110 can have different polarization states. Specifically, the image group 110 includes an image source 111, which has an LED light source. Since the LED light source is unpolarized light, a first polarizer 112 and a second polarizer 113 are respectively attached to different display areas of the image source 111. The first polarizer 112 and the second polarizer 113 have different linear polarization directions, so that the image group 110 emits light rays with two polarization states. For example, the first polarizer 112 is attached to the upper half of the image source 111, and the second polarizer 113 is attached to the lower half. The first polarizer 112 is a horizontal polarizer, and the second polarizer 113 is a vertical polarizer.

[0036] When the LED light source emits light, the light is adjusted to have different polarization states by the first polarizer 112 and the second polarizer 113. The light with different polarization states enters the polarization beam splitter 120, which divides the light into a first beam 140 and a second beam 150. The first beam 140 passes through the polarization beam splitter 120 and enters the output group 130. The second beam 150 is reflected into the parallax element 160, and after passing through the parallax element 160, it enters the output group 130 at an output angle different from that of the first beam 140. The first beam 140 and the second beam 150 are then emitted from the output group 130 to different focal planes.

[0037] In some embodiments, the first polarizer 112 and the second polarizer 113 are absorption polarizers.

[0038] Optionally, such as Figure 1 and Figure 4 As shown, the image group 110 includes an image source 111, which has an LD light source, and a phase delay film 114 is attached to a portion of the display area of ​​the image source 111. The phase delay film 114 is used to adjust the polarization state of the polarized light emitted by the image source 111.

[0039] Specifically, the polarization beam splitter 120 can split light rays with different polarization states into a first beam 140 and a second beam 150. Therefore, the light emitted by the image group 110 can have different polarization states. Specifically, the image group 110 includes an image source 111, which has an LD light source. Since the LD light source is a polarized light source, it is only necessary to attach a phase retardation film 114 to a portion of the display area of ​​the image source 111, for example, attaching the phase retardation film 114 to the upper half of the image source 111. The phase retardation film 114 can adjust the polarization direction of one type of polarized light emitted by the image source 111 to another polarization direction, for example, adjusting the light emitted by the LD light source to an orthogonal state.

[0040] When the LD light source emits light, part of the light is adjusted by the phase retardation plate 114 to have a different polarization state than the LD light source. The light with different polarization states enters the polarization beam splitter 120, which divides the light into a first beam 140 and a second beam 150. The first beam 140 passes through the polarization beam splitter 120 and enters the output group 130. The second beam 150 is reflected into the parallax element 160, and after passing through the parallax element 160, it enters the output group 130 at an output angle different from that of the first beam 140. The first beam 140 and the second beam 150 are then emitted from the output group 130 to different focal planes.

[0041] In some implementations, the phase delay plate 114 is a quarter-wave plate.

[0042] Optionally, such as Figure 1 As shown, the emission group 130 includes an optical waveguide 131 and a prism or freeform surface element. When the emission group 130 is an optical waveguide 131, an emission grating 132 is provided in a portion of the optical waveguide 131.

[0043] Specifically, the first beam splitter 140 and the second beam splitter 150 enter the output group 130 at different angles. The output group 130 can be a waveguide, prism, or freeform surface element. Figure 1 As shown, the output group 130 is an optical waveguide 131. The first beam splitter 140 and the second beam splitter 150 enter different optical waveguides 131 respectively. Prism couplers, tilted mirror couplers, or output gratings 132 are set on the optical waveguides 131. Figure 1 The image shown is the output grating 132. The output grating 132 causes the first beam splitter 140 and the second beam splitter 150 to be in a semi-transmitted and semi-reflected state in different optical waveguides 131. The light beams transmitted through different optical waveguides 131 enter the human eye. Because the first beam splitter 140 and the second beam splitter 150 are incident at different angles in different optical waveguides 131, the angles of the output optical waveguides 131 are also different, so that the image seen by the human eye is located on different focal planes.

[0044] Optionally, such as Figure 1 As shown, the dual-focal-plane display device 100 also includes a collimating element 170, a reflecting element 180, and / or an imaging assembly 190, which are located between the image group 110 and the polarization beam splitter group 120.

[0045] Specifically, a collimating element 170, a reflecting element 180, and an imaging component 190 are also provided between the image group 110 and the polarization beam splitter group 120. The light emitted from the image group 110 is collimated by the collimating element 170 and then enters the reflecting element 180. After being reflected by the reflecting element 180, it enters the imaging component 190. The imaging component 190 eliminates the dispersion and distortion effects of the light before it enters the polarization beam splitter group 120.

[0046] In some embodiments, the collimating element 170, the reflecting element 180, and the imaging assembly 190 can be selected and configured according to the position of the image group 110 and the specific circumstances of the light emitted by the image group 110.

[0047] In some embodiments, the collimating element 170 may be a single lens or a combination of lenses, and no limitation is made here.

[0048] In some embodiments, the reflecting element 180 can be a reflecting prism, a plane mirror, or a spherical mirror, whichever can be selected according to the specific circumstances, and no limitation is made here.

[0049] In some embodiments, the imaging component 190 may be a convex lens, a spherical lens, a concave lens, a convex lens and a convex lens arranged sequentially along the optical path direction. The imaging component 190 is prior art and is not specifically limited.

[0050] In another aspect of this application, an augmented reality device is provided, including the dual-focal-area display device 100 and a wearable device, wherein the dual-focal-area display device 100 and the wearable device are fixedly connected.

[0051] Specifically, the augmented reality device includes a fixedly connected dual-focal-plane display device 100 and a wearable device. Users can fix the augmented reality device in place through the wearable device. The dual-focal-plane display device enables the image seen by the human eye to be imaged on different focal planes, which alleviates eye fatigue caused by observing an image within the same focal plane and also improves the stereoscopic effect of the image.

[0052] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A dual-focal-plane display device, characterized in that, include: The image group, polarization beam splitter, and output group are arranged sequentially along the optical path; The polarization beam splitter is used to divide the light emitted from the image group into a first beam and a second beam so that they are respectively incident on the first optical path and the second optical path. A parallax element is provided in the second optical path. After the second beam is adjusted at the exit angle by the parallax element, it is coupled into the exit group at different angles with the first beam and exited to different focal planes by the exit group.

2. The dual-focal-plane display device as described in claim 1, characterized in that, The parallax element includes a prism or a reflector, used to create a preset angle between the second beam and the first beam.

3. The dual-focal-plane display device as described in claim 2, characterized in that, The parallax element is a prism, and the angle between the light-emitting surface of the prism and the optical axis of the second beam splitter in the propagation direction of the polarization beam splitter is α, where 10°≤α≤80°.

4. The dual-focal-plane display device as described in claim 1, characterized in that, The parallax element is adjacent to the polarization beam splitter.

5. The dual-focal-plane display device according to any one of claims 1 to 4, characterized in that, The image group includes an image source with an LED light source. Different display areas of the image source are respectively fitted with a first polarizer and a second polarizer, and the first polarizer and the second polarizer have different polarization directions.

6. The dual-focal-plane display device according to any one of claims 1 to 4, characterized in that, The image group includes an image source having an LD light source, and a phase delay film is attached to a portion of the display area of ​​the image source. The phase delay film is used to adjust the polarization state of the polarized light emitted by the image source.

7. The dual-focal-plane display device according to any one of claims 1 to 4, characterized in that, The output group includes optical waveguides, prisms, or freeform surface elements.

8. The dual-focal-plane display device as described in claim 7, characterized in that, When the output group is the optical waveguide, an output grating is provided in a portion of the optical waveguide.

9. The dual-focal-plane display device according to any one of claims 1 to 4, characterized in that, The dual-focal-plane display device further includes a collimating element, a reflecting element, and / or an imaging component, wherein the collimating element, the reflecting element, and / or the imaging component are located between the image group and the polarization beam splitting group.

10. An augmented reality device, characterized in that, The invention includes the dual-focal-area display device and wearable device as described in any one of claims 1 to 9, wherein the dual-focal-area display device is fixedly connected to the wearable device.

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