Display device and wearable display device

Abstract

The present disclosure provides a display device and a wearable display device. The display device includes an optical waveguide element, a display unit, and an optical sensor; the optical waveguide element includes a first optical surface, a second optical surface adjacent to the first optical surface, a third optical surface opposite to the second optical surface, a first semi-transmissive semi-reflective element, and a reflective element; the display unit is configured to incident a first light ray for displaying an image on the optical waveguide element from the first optical surface; the first semi-transmissive semi-reflective element is configured to transmit a part of the first light ray and reflect a part of a second light ray incident from the third optical surface to the first optical surface; the reflective element is configured to reflect a part of the first light ray transmitted by the first semi-transmissive semi-reflective element to the second optical surface for emitting; the optical sensor is configured to receive a part of the second light ray emitted from the first optical surface, convert the second light ray into an electrical signal, and generate a display image of the display unit according to the electrical signal. The display device and the display device provided by the present disclosure can achieve immediate acquisition and immediate display, and enhance the integration degree of the display device.

Description

Technical Field

[0001] The present disclosure relates to the field of display technologies, and particularly to a display device and a wearable display device. Background Art

[0002] Augmented Reality (AR) technology is a new technology that integrates real-world information and virtual-world information, which can bring convenience to people in daily life. It can achieve a visual experience beyond an electronic screen. While presenting real-world information, virtual information can be simultaneously displayed, and the information in the digital world and the real world complement and overlap each other, and are presented to the user together.

[0003] The structures of current AR display products are still under continuous exploration, application, and development. How to design AR display products with new structures to expand the application of AR technology has become an important research topic in the current AR display field. Summary of the Invention

[0004] In view of this, the purpose of the present disclosure is to provide a display device and a wearable display device.

[0005] Based on the above purpose, the present disclosure provides a display device, including an optical waveguide element, a display unit, and a light sensor;

[0006] The optical waveguide element includes a first optical surface, a second optical surface adjacent to the first optical surface, a third optical surface opposite to the second optical surface, a first semi-transmissive semi-reflective element, and a reflective element;

[0007] The display unit is configured to incident first light for displaying an image on the optical waveguide element from the first optical surface;

[0008] The first semi-transmissive semi-reflective element is configured to transmit part of the first light and reflect part of the second light incident from the third optical surface to the first optical surface;

[0009] The reflective element is configured to reflect part of the first light transmitted by the first semi-transmissive semi-reflective element to the second optical surface and emit it;

[0010] The light sensor is configured to receive part of the second light emitted from the first optical surface, convert the second light into an electrical signal, and generate a display image of the display unit according to the electrical signal.

[0011] Optionally, the first semi-transmissive semi-reflective element includes:

[0012] The first polarization reflection film is configured to convert part of the first light rays into first polarized light and emit it to the reflection element, convert part of the second light rays into second polarized light and emit it to the first light surface, and convert part of the second light rays into third polarized light and emit it to the second light surface.

[0013] Optionally, the number of the first polarization reflection films is multiple, and the multiple first polarization reflection films are arranged in parallel and at equal intervals, and the first polarization reflection film is inclined with respect to the second light surface.

[0014] Optionally, the reflection element includes:

[0015] A light conversion device configured to convert the first polarized light into fourth polarized light perpendicular to the first polarized light;

[0016] A second semi-transmissive semi-reflective element configured to reflect the fourth polarized light to the second light surface for emission.

[0017] Optionally, the second semi-transmissive semi-reflective element includes multiple second polarization reflection films, and the multiple second polarization reflection films are arranged in parallel and at equal intervals, and the second polarization reflection film is inclined with respect to the second light surface.

[0018] Optionally, there is a first included angle between the first polarization reflection film and the second light surface, and a second included angle between the second polarization reflection film and the second light surface, and the sum of the first included angle and the second included angle is 180°.

[0019] Optionally, the first polarized light and the third polarized light are polarized lights of the same type, and the second polarized light and the fourth polarized light are polarized lights of the same type.

[0020] Optionally, the light conversion device includes a 1 / 2 wave plate, and the light conversion device is arranged in parallel with the second polarization reflection film.

[0021] Optionally, the display unit includes multiple display sub-units arranged in an array, the light sensor includes multiple light sensing sub-units arranged in an array, and the display sub-units and the light sensing sub-units are arranged at intervals.

[0022] Optionally, each display sub-unit includes one or more pixel units, and the light sensor and the display unit are integrally provided.

[0023] Optionally, the display unit includes a micro display unit.

[0024] The present disclosure also provides a wearable display device including the display device as described in any one of the above.

[0025] As can be seen from the above, in the display device and the wearable display device provided by the present disclosure, by providing a first semi-transmissive and semi-reflective element and a reflective element in the optical waveguide element, the acquisition optical path of the external scene image and the display optical path of the near-eye display are both arranged in one optical waveguide element, so as to achieve immediate acquisition and display without being divided into two modules, further enhancing the integration degree of the display device; meanwhile, when using this display device to manufacture devices such as AR glasses, the display unit and the optical sensor can be moved away from the glasses to the top or side of the forehead, thus greatly reducing the blockage of the optical system to the external line of sight and making the weight distribution more ergonomic, thereby improving the wearing experience of the device and optimizing the appearance of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the following will briefly introduce the drawings required for use in the embodiments or related technology descriptions. Obviously, the drawings in the following description are only embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 Structural schematic diagram of the display device according to an embodiment of the present disclosure;

[0028] Figure 2 Structural schematic diagram of the display unit and the optical sensor according to an embodiment of the present disclosure;

[0029] Figure 3 Optical path schematic diagram of the display device according to an embodiment of the present disclosure;

[0030] Figure 4 Structural schematic diagram of the wearable display device according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] To make the objectives, technical solutions, and advantages of the present disclosure clearer and more understandable, the following further elaborates on the present disclosure in detail with reference to specific embodiments and the accompanying drawings.

[0032] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should have the ordinary meanings understood by those of ordinary skill in the field to which the present disclosure belongs. The terms "first", "second" and similar terms used in the embodiments of the present disclosure do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0033] In optical imaging elements, the optical waveguide technology is a relatively characteristic optical component born out of the requirements of AR glasses. Because of its thinness, lightness and high light penetration characteristics, it is considered to be an essential optical solution for consumer-grade AR glasses. With the adoption and mass production of optical waveguides in two generations of Microsoft Hololens products and devices such as Magic Leap One, the discussion heat about optical waveguides has been continuously increasing.

[0034] In AR glasses, in order to ensure that there is no loss or leakage of light during transmission, "total internal reflection" is the key. That is, light travels forward through back-and-forth reflections in the waveguide like a swimming snake without transmitting out. Simply put, two conditions need to be met to achieve total internal reflection: (1) The transmission medium, that is, the waveguide material, needs to have a refractive index higher than that of the surrounding medium (n1>n2); (2) The incident angle of light entering the waveguide needs to be greater than the critical angle θc.

[0035] After the optical machine completes the imaging process, the waveguide couples the light into its own glass substrate and transmits the light to the front of the eyes and then releases it through the principle of "total internal reflection". In this process, the waveguide is only responsible for transmitting the image and generally does not perform any "work" on the image itself (such as magnification or reduction), and can be understood as "parallel light enters, parallel light exits". Therefore, it is a separate component independent of the imaging system.

[0036] The applicant has found that with this waveguide transmission channel, the display screen and the imaging system can be moved away from the glasses to the top or side of the forehead, which can greatly reduce the blockage of the optical system to the external line of sight and make the weight distribution more ergonomic, thus improving the wearing experience of the device.

[0037] For the above reasons, the embodiments of the present disclosure provide a display device. As Figure 1 shown, the display device includes an optical waveguide element 1, a display unit 2 and a light sensor.

[0038] Among them, the optical waveguide element 1 includes a first optical surface 11, a second optical surface 12 adjacent to the first optical surface 11, a third optical surface 13 opposite to the second optical surface 12, a first semi-transmissive and semi-reflective element 14, and a reflective element 15. Among them, the second optical surface 12 and the third optical surface 13 are arranged in parallel, and the included angle between the first optical surface 11 and the second optical surface 12 is an acute angle. The first semi-transmissive and semi-reflective element 14 is disposed between the second optical surface 12 and the third optical surface 13, the first optical surface 11 is disposed on one side of the first semi-transmissive and semi-reflective element 14, the reflective element 15 is disposed on the other side of the first semi-transmissive and semi-reflective element 14, and the first semi-transmissive and semi-reflective element 14 and the reflective element 15 are disposed in the same plane. Optionally, the second optical surface 12 faces the human eye, and the third optical surface 13 faces the external scene.

[0039] The display unit 2 is located on the side of the first optical surface 11 away from the first semi-transmissive and semi-reflective element 14 and is arranged in parallel with the first optical surface 11. The display unit 2 is configured to incident a first light ray for displaying an image from the first optical surface to the optical waveguide element 1. In this embodiment, the display unit 2 is configured to display an image, generate a first light ray based on the displayed image of the display unit 2, and the first light ray is incident into the optical waveguide element 1 from the first optical surface 11.

[0040] The first semi-transmissive and semi-reflective element 14 is configured to transmit part of the first light ray. Among them, after the first light ray enters from the first optical surface 11, it will enter the first semi-transmissive and semi-reflective element 14. The first semi-transmissive and semi-reflective element 14 can transmit part of the first light ray, and the transmitted part of the first light ray can enter the reflective element 15. At the same time, the second light ray formed by the external scene can enter the optical waveguide element 1 through the third optical surface 13 and then enter the first semi-transmissive and semi-reflective element 14. The first semi-transmissive and semi-reflective element 14 can reflect part of the second light ray incident from the third optical surface 13 to the first optical surface 11 and then emit it.

[0041] The reflective element 15 is configured to reflect the part of the first light ray transmitted by the first semi-transmissive and semi-reflective element 14 to the second optical surface 12 and emit it. The part of the first light ray transmitted from the first semi-transmissive and semi-reflective element 14 can be reflected by the reflective element 15 to the second optical surface 12 and then emitted, so that the human eye can view the displayed image of the display unit 2.

[0042] The light sensor is disposed on the display unit 2, that is, the light sensor is also disposed on the side of the first light surface 11 away from the first semi-transmissive semi-reflective element 14 and is arranged parallel to the first light surface 11. The light sensor is used to receive a part of the second light rays emitted from the first light surface and convert the second light rays into electrical signals so that the display image of the display unit can be generated according to the electrical signals converted from the second light rays. After the second light rays are incident from the third light surface 13, the first semi-transmissive semi-reflective element 14 reflects a part of the second light rays to the first light surface 11 and emits them. The light sensor can collect the part of the first light surface emitted and convert it into a corresponding electrical signal, and this electrical signal is used to generate the display image of the display unit 2.

[0043] In the display device described in this embodiment, by providing a first semi-transmissive semi-reflective element and a reflective element in the optical waveguide element, the acquisition optical path of the external scene image and the display optical path of the near-eye display are both arranged in one optical waveguide element, so as to achieve immediate acquisition and display without being divided into two modules, further enhancing the integration degree of the display device; at the same time, when using this display device to manufacture devices such as AR glasses, the display unit and the light sensor can be moved away from the glasses to the top or side of the forehead, so that the obstruction of the optical system to the external line of sight can be greatly reduced, and the weight distribution can be made more ergonomic, thus improving the wearing experience of the device and optimizing the appearance of the device.

[0044] In some embodiments, after the second light rays for displaying the external scene image are incident through the third light surface 13, the first semi-transmissive semi-reflective element 14 reflects a part of the second light rays to the first light surface 11 and emits them, and then the light sensor absorbs and converts them into corresponding electrical signals. In some alternative embodiments, the light sensor can be connected to devices such as a server, and the server processes the electrical signals corresponding to this part of the second light rays processed by the light sensor, so that some display information related to the external scene image can be obtained, and the display unit 2 displays this display information. Among them, the display information can be supplementary display content for the external scene image, or the external scene image is processed to be recognizable by the human eye and then displayed through the display unit 2 when the human eye cannot recognize the external scene image. After the display unit 2 displays this display information in the form of an image, the first light rays for displaying the image of this display information pass through the first light surface 11 and then propagate in the optical waveguide element 1 to the first semi-transmissive semi-reflective element 14. A part of the first light rays are transmitted through the first semi-transmissive semi-reflective element 14 and incident on the reflective element 15, and are reflected by the reflective element 15 to the second light surface 12 and then emitted, so that the human eye can view the display image of the display unit 2.

[0045] For example, the external scene is a pot of plants. After the second light used to display the image of the plant is incident through the third light surface 13, part of the second light is reflected by the first semi-transparent and semi-reflective element 14 to the first light surface 11 and then absorbed by the light sensor and processed into an electrical signal. The server connected to the light sensor obtains the external scene image corresponding to the plant based on the electrical signal, and performs feature recognition on the external scene image, thereby obtaining basic information such as the name, origin, and habits of the plant, and displays it through the display unit 2; after the first light used to display the basic information image passes through the first light surface 11, part of the first light is transmitted from the first semi-transparent and semi-reflective element 14 and is reflected by the reflective element 15 to the second light surface 12 and then emitted, so that the human eye can see the basic information such as the name, origin, and habits of the plant displayed on the display unit 2.

[0046] For example, the external scene is a building. After the second light used to display the image of the building is incident through the third light surface 13, part of the second light is reflected by the first semi-transparent and semi-reflective element 14 to the first light surface 11 and then absorbed by the light sensor and processed into an electrical signal. The server connected to the light sensor obtains the external scene image corresponding to the building based on the electrical signal, and performs feature recognition on the external scene image, thereby obtaining the name, location, style, history and other architectural information of the building, and displays it through the display unit 2; after the first light used to display the building information image passes through the first light surface 11, part of the first light is transmitted from the first semi-transparent and semi-reflective element 14 and is reflected by the reflective element 15 to the second light surface 12 and then emitted, so that the human eye can see the name, location, style, history and other architectural information of the building displayed on the display unit 2.

[0047] For example, when the user is in an extreme environment such as a mine or at night, the human eye cannot directly recognize the external scene and thus cannot see the surrounding environment clearly. At this time, a light sensor with high photosensitivity is used to receive and process part of the second light used to display the surrounding environment to generate a corresponding electrical signal. The server obtains a picture or video of the surrounding environment based on the electrical signal and performs brightening, enhancement and other processing, and adjusts the dark and blurred picture or video that cannot be directly recognized by the human eye to a bright and clear picture or video that can be directly recognized by the human eye and displays it through the display unit 2; after that, the first light used to display the surrounding environment passes through the first optical surface 11, and part of the first light is transmitted from the first semi-transmissive and semi-reflective element 14 and is reflected by the reflective element 15 to the second optical surface 12 and then emitted, so that the human eye can directly see the surrounding environment through the display device.

[0048] For example, when the user is searching for people or objects in a complex environment, the second light for displaying the external scene is received by the light sensor and converted into an electrical signal corresponding to the second light. Then, the server generates an image or video of the external scene based on the electrical signal. After target recognition is performed on the image or video, the targets that the user is interested in, such as people, objects, etc., are marked and then displayed through the display unit 2. After that, when the first light for displaying the external scene passes through the first light surface 11, part of the first light is transmitted through the first semi-transmissive and semi-reflective element 14 and reflected by the reflecting element 15 to the second light surface 12 and then emitted, so that the human eye can quickly determine the position of the target of interest in the complex environment.

[0049] In some embodiments, as Figure 1 shown, the first semi-transmissive and semi-reflective element 14 includes a first polarization reflection film 141. The first polarization reflection film 141 is configured to: convert part of the first light into first polarized light and emit it to the reflecting element 15, convert part of the second light into second polarized light and emit it to the first light surface 11, and convert part of the second light into third polarized light and emit it to the second light surface 12.

[0050] In this embodiment, the first semi-transmissive and semi-reflective element 14 may include a first polarization reflection film 141, and the first polarization reflection film 141 can convert the incident light into polarized light. Therefore, when the first light for displaying an image incident from the first light surface 11 enters the first polarization reflection film 141, part of the first light is converted into first polarized light and emitted to the reflecting element 15. When the second light formed by the external scene enters the first polarization reflection film 141 through the third light surface 13, part of the second light is converted into second polarized light and emitted to the first light surface 11 and then absorbed by the light sensor, and the other part of the second light is converted into third polarized light and emitted to the second light surface 12 and then emitted through the second light surface 12, so that the human eye on one side of the second light surface 12 can see the external scene through the optical waveguide element 1. In this way, the user can simultaneously see the external scene and the display content of the display unit 2.

[0051] In this way, the display device described in this embodiment can be used to manufacture AR glasses. The optical waveguide element 1 is used as the lens of the glasses, and the display unit 2 and the light sensor are arranged on the top or side of the forehead of the AR glasses. In this way, when the user uses the AR glasses, the user can not only see the display content displayed by the display unit 2, but also see the external scene through the lens made of the optical waveguide element 1. In this way, even when the user wears the AR glasses in a public place to watch the display content, the user can always observe the external situation, so as to obtain a safer viewing experience.

[0052] Optionally, in the above embodiments, the first polarized light is parallel polarized light (P light), the second polarized light is perpendicular polarized light (S light), and the third polarized light is parallel polarized light (P light).

[0053] Optionally, in the above embodiments, when the first light ray enters the first polarization reflection film 141, 50% of the first light ray is converted into the first polarized light and exits to the reflection element 15; when the second light ray is incident on the first polarization reflection film 141, 50% of the second light ray is converted into the second polarized light and exits to the first light surface 11 and is absorbed by the light sensor, and the other 50% of the second light ray is converted into the third polarized light and exits to the second light surface 12 and then exits through the second light surface 12, thereby improving the transmittance and reflectivity of the first semi-transmissive and semi-reflective element 14.

[0054] Optionally, as Figure 1 shown, in the above embodiments, the number of the first polarization reflection films 141 is multiple, and the multiple first polarization reflection films 141 are arranged in parallel and at equal intervals, and the first polarization reflection film is inclined with respect to the second light surface. In this embodiment, the orthographic projections of the multiple first polarization reflection films 141 on the second light surface 12 are connected and do not overlap. For example, Figure 1 for the three first polarization reflection films 141 shown in, the orthographic projection of the end of the first polarization reflection film 141 at the middle position close to the second light surface 12 on the second light surface 12 coincides with the orthographic projection of the end of the first polarization reflection film 141 on the left side close to the third light surface 13 on the second light surface 12, and the orthographic projection of the end of the first polarization reflection film 141 at the middle position close to the third light surface 13 on the second light surface 12 coincides with the orthographic projection of the end of the first polarization reflection film 141 on the right side close to the second light surface 12 on the second light surface 12, thereby ensuring the display effect after the external scene is transmitted.

[0055] Optionally, in the above embodiments, by adjusting parameters of the first polarization reflection film 141, the angle between the first polarization reflection film 141 and the second light surface 12, etc., the third polarized light can be made to exit from the second light surface 12 at an angle required by the user. For example, the third polarized light can exit perpendicular to the second light surface 12.

[0056] In some other embodiments, as Figure 1 shown, the reflection element 15 includes a light conversion device 151 and a second semi-transmissive and semi-reflective element 152. Among them, the light conversion device 151 is used to convert the first polarized light into a fourth polarized light perpendicular to the first polarized light; the second semi-transmissive and semi-reflective element 152 is used to reflect the fourth polarized light to the second light surface 12 and exit.

[0057] In this embodiment, the light conversion device 151 is disposed within the optical waveguide element 1 and is located between the first semi-transmissive and semi-reflective element 14 and the second semi-transmissive and semi-reflective element 152. The light conversion device 151 can convert polarized light, thereby converting the first polarized light incident on the light conversion device 151 into the fourth polarized light, and then reflecting the fourth polarized light through the second semi-transmissive and semi-reflective element 152 to be emitted from the second light surface 12, so as to be seen by the human eye.

[0058] Optionally, as Figure 1 shown, the second semi-transmissive and semi-reflective element 152 includes a plurality of second polarization reflection films 1521, and the plurality of second polarization reflection films 1521 are arranged in parallel and at equal intervals. The second polarization reflection film 1521 is inclined with respect to the second light surface 12. In this embodiment, the second semi-transmissive and semi-reflective element 152 may include a plurality of second polarization reflection films 1521 arranged in parallel and at equal intervals. The second polarization reflection film 1521 can reflect the incident fourth polarized light to be emitted from the second light surface 12 so as to be seen by the human eye on one side of the second light surface 12.

[0059] Optionally, in this embodiment, the orthographic projections of the plurality of second polarization reflection films 1521 on the second light surface 12 are connected and do not overlap. For example, Figure 1 for the three second polarization reflection films 1521 shown in, the orthographic projection on the second light surface 12 of the end of the second polarization reflection film 1521 located in the middle near the third light surface 13 coincides with the orthographic projection on the second light surface 12 of the end of the second polarization reflection film 1521 located on the left near the second light surface 12, and the orthographic projection on the second light surface 12 of the end of the second polarization reflection film 1521 located in the middle near the second light surface 12 coincides with the orthographic projection on the second light surface 12 of the end of the second polarization reflection film 1521 located on the right near the third light surface 13, so as to ensure the display effect after the transmission of the external scene.

[0060] Optionally, in the above embodiment, the fourth polarized light is a vertically polarized light (S light). That is: the first polarized light and the third polarized light are of the same type of polarized light, both being parallel polarized lights (P lights); the second polarized light and the fourth polarized light are of the same type of polarized light, both being vertically polarized lights (S lights).

[0061] Optionally, as Figure 1 shown, an included angle 142 is included between the first polarization reflection film 141 and the second light surface 12, and an included angle 153 is included between the second polarization reflection film 1521 and the second light surface 12. The sum of the first included angle 142 and the second included angle 153 is 180°.

[0062] In some embodiments of the present disclosure, the light conversion device 151 includes a half-wave plate. The half-wave plate is disposed in the optical waveguide element 1 and the angle between the half-wave plate and the second light surface 12 can be an acute angle or a right angle. The first polarized light can be converted into the fourth polarized light by the half-wave plate. Optionally, the light conversion device 151 is disposed parallel to the second polarization reflection film 1521, so as to improve the conversion efficiency of the light conversion device 151.

[0063] In some alternative embodiments, as Figure 2 shown, the display unit 2 includes a plurality of display sub-units 21 arranged in an array, the light sensor 4 includes a plurality of light sensing sub-units 41 arranged in an array, and the display sub-units 21 and the light sensing sub-units 41 are arranged at intervals, so that the light sensor 4 and the display unit 2 can respectively well realize the functions of light collection and image display.

[0064] Optionally, each display sub-unit 21 includes one or more pixel units, and the light sensor is integrally provided with the display unit 2. In this embodiment, the pixel-level display sub-units 21 and the display sub-units 21 are integrated into one body, that is, the light sensor and the display unit 2 are integrated by using the Camera&display integrated technology, so as to improve the integration efficiency of the entire display device, save the installation space of the light sensor and the display unit 2 and reduce the weight of the display device, making the weight distribution more ergonomic.

[0065] Optionally, the display unit 2 includes a micro display unit, so as to reduce pixelation and improve the viewing effect.

[0066] Optionally, an optical path control component 3 is further disposed between the display unit 2 and the first light surface 11. The first light emitted from the display unit 2 can be guided into a substantially parallel light beam by the optical path control component 3 and then enter the optical waveguide element 1.

[0067] In the embodiments of the present disclosure, as Figure 3 shown, after the second light 71 for displaying an external scene image enters the first polarization reflection film 141 through the third light surface 13, the first polarization reflection film 141 converts part of the second light 71 into the second polarized light 73 and emits it to the first light surface 11, where it is absorbed by the light sensor, and the other part of the second light 71 is converted into the third polarized light 72 and emitted to the second light surface 12 and then emitted through the second light surface 12, so that a human eye on one side of the second light surface 12 can see the external scene through the optical waveguide element 1.

[0068] After the optical sensor receives the second polarized light 73, it converts the second polarized light 73 into a corresponding electrical signal. The server connected to the optical sensor can process this electrical signal, so as to obtain the display content of the display unit 2 and display it through the display unit 2.

[0069] After that, the first light ray 61 for displaying an image is incident on the first polarization reflection film 141 via the first light surface 11. The first polarization reflection film 141 converts part of the first light ray 61 into the first polarized light 62 and emits it to the light ray conversion device 151. The light ray conversion device 151 converts the first polarized light 62 into the fourth polarized light 63 and then incident on the second polarization reflection film 1521. The reflected polarized light 64 is emitted to the second light surface 12 through the second polarization reflection film 1521, so that it can be seen by the human eye on one side of the second light surface 12.

[0070] In addition, the second light ray 71 for displaying an external scene image is incident on the second polarization reflection film 1521 through the third light surface 13. The second polarization reflection film 1521 converts part of the second light ray 71 into the fifth polarized light 74 and emits it through the second light surface 12, so that the human eye on one side of the second light surface 12 can also see the external scene through this place. At the same time, the second polarization reflection film 1521 converts part of the second light ray 71 into the sixth polarized light 75 and reflects it to the fourth light surface 14 for emission. The sixth polarized light 75 will not be seen by the human eye and will not affect the display effect of the entire display device.

[0071] Based on the same inventive concept, corresponding to the display device described in any of the above embodiments, the present disclosure also provides a wearable display device, which includes the display device described in any one of the above. For example, the wearable display device can be a wearable AR helmet, AR glasses, etc.

[0072] As Figure 4 shown, when using the display device described in this embodiment to manufacture wearable display devices such as AR helmets and AR glasses, two symmetrically arranged display devices described in this embodiment can be used to manufacture the two lenses of the AR helmet and AR glasses, so as to realize binocular AR display for users.

[0073] The wearable display device of the above embodiment includes the corresponding display device in any of the foregoing embodiments, and has the beneficial effects of the corresponding display device embodiments, which will not be elaborated here.

[0074] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples; under the concept of the present disclosure, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of brevity.

[0075] In addition, for the sake of simplicity of explanation and discussion, and in order not to make the embodiments of the present disclosure difficult to understand, the well-known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided drawings. Further, the devices may be shown in block diagram form in order not to make the embodiments of the present disclosure difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform on which the embodiments of the present disclosure are to be implemented (i.e., these details should be entirely within the understanding of those skilled in the art). In cases where specific details (such as circuits) are set forth to describe exemplary embodiments of the present disclosure, it will be apparent to those skilled in the art that the embodiments of the present disclosure may be implemented without these specific details or with variations of these specific details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0076] Although the present disclosure has been described in connection with specific embodiments of the present disclosure, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art based on the foregoing description. For example, other memory architectures (such as dynamic RAM (DRAM)) may be used with the embodiments discussed.

[0077] The embodiments of the present disclosure are intended to cover all such alternatives, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. A display device, comprising an optical waveguide element, a display unit, and an optical sensor; The optical waveguide element includes a first optical surface, a second optical surface adjacent to the first optical surface, a third optical surface opposite to the second optical surface, a first semi-transmissive and semi-reflective element, and a reflective element; the second optical surface and the third optical surface are arranged in parallel, and the angle between the first optical surface and the second optical surface is an acute angle; The display unit is configured to incident first light for displaying an image on the optical waveguide element from the first optical surface; The first semi-transmissive and semi-reflective element is configured to transmit part of the first light and reflect part of the second light incident from the third optical surface to the first optical surface; The reflective element is configured to reflect part of the first light transmitted by the first semi-transmissive and semi-reflective element to the second optical surface for emission; The optical sensor is configured to receive part of the second light emitted from the first optical surface, convert the second light into an electrical signal, and generate a display image of the display unit according to the electrical signal; The first semi-transmissive and semi-reflective element includes: A first polarization reflective film for converting part of the first light into first polarized light and emitting it to the reflective element; The reflective element includes: A light conversion device for converting the first polarized light into fourth polarized light perpendicular to the first polarized light; A second semi-transmissive and semi-reflective element for reflecting the fourth polarized light to the second optical surface for emission.

2. The display device according to claim 1, wherein, The first polarization reflective film is further configured to convert part of the second light into second polarized light and emit it to the first optical surface, and convert part of the second light into third polarized light and emit it to the second optical surface.

3. The display device according to claim 2, wherein, The number of the first polarization reflective films is multiple, and the multiple first polarization reflective films are arranged in parallel and at equal intervals, and the first polarization reflective film is inclined with respect to the second optical surface.

4. The display device according to claim 1, wherein, The second semi-transmissive and semi-reflective element includes multiple second polarization reflective films, and the multiple second polarization reflective films are arranged in parallel and at equal intervals, and the second polarization reflective film is inclined with respect to the second optical surface.

5. The display device according to claim 4, wherein, A first angle is included between the first polarization reflective film and the second optical surface, a second angle is included between the second polarization reflective film and the second optical surface, and the sum of the first angle and the second angle is 180°.

6. The display device according to claim 2, wherein, The first polarized light and the third polarized light are of the same type of polarized light, and the second polarized light and the fourth polarized light are of the same type of polarized light.

7. The display device according to claim 4, wherein, The light conversion device includes a 1 / 2 wave plate, and the light conversion device is arranged in parallel with the second polarization reflective film.

8. The display device according to claim 1, wherein, The display unit includes multiple display sub-units arranged in an array, the optical sensor includes multiple light sensing sub-units arranged in an array, and the display sub-units and the light sensing sub-units are arranged at intervals.

9. The display device according to claim 8, wherein, Each display sub-unit includes one or more pixel units, and the optical sensor and the display unit are integrally provided.

10. The display device according to claim 8, wherein, The display unit includes a micro display unit.

11. A wearable display device, comprising the display device according to any one of claims 1-10.

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