Light engine and near-eye display device

Abstract

The utility model provides a light engine and a near-to-eye display device. The light engine comprises a support; the magnetic driving unit is arranged on the bracket; the lens unit is connected with the magnetic driving unit; the display unit is connected with the support, and the display unit and the lens unit are arranged in a spaced mode; wherein the magnetic driving unit is configured to drive the lens unit to move so as to adjust the distance between the lens unit and the display unit. The distance between the display unit and the lens unit in the light engine can be adjusted.

Description

Technical Field

[0001] The utility model relates to the field of extended reality, and in particular to a light engine and a near-eye display device. Background Art

[0002] Near-eye display devices generally include extended reality (Extended Reality, XR) devices, wherein the extended reality devices include virtual reality (VR), augmented reality (AR) and mixed reality (MR) devices. The extended reality device at least includes products in the form of glasses or head-mounted display products. Correspondingly, the extended reality device should be at least an optically transparent product or a video-transmitting product. The near-eye display device can create a virtual-real combination of scenes for users, create a new visualization environment, and has broad application prospects in important fields such as military, medical, education, games and life.

[0003] The light engine in the near-eye display device is composed of a display unit and a lens unit. The display image generated by the display unit is refracted by the lens unit to adjust the direction of the light path or magnify the image. However, the distance between the display unit and the lens unit of the light engine is often fixed. Due to the existence of tolerances, the display image (object image) of the display unit in the light engine is difficult to be set at the focus of the lens unit, which results in the virtual image generated by the light engine being unable to be projected to infinity. When the user uses the near-eye display device to watch the infinitely far display scene, the virtual image will be separated from the real scene. Utility Model Content

[0004] Embodiments of the present application provide a light engine and a near-eye display device, wherein the distance between a display unit and a lens unit in the light engine is adjustable.

[0005] The present application provides a light engine, including:

[0006] Bracket;

[0007] A magnetic drive unit, wherein the magnetic drive unit is disposed on the bracket;

[0008] A lens unit, wherein the lens unit is connected to the magnetic drive unit;

[0009] A display unit, the display unit is connected to the bracket, and the display unit is spaced apart from the lens unit;

[0010] The magnetic driving unit is configured to drive the lens unit to move so as to adjust the distance between the lens unit and the display unit.

[0011] In some embodiments, the magnetic drive unit includes a driving member and a magnetic member, the driving member is fixedly connected to the bracket, the magnetic member is slidably connected to the bracket, the lens unit is connected to the magnetic member, and the driving member is configured to change the size and direction of its own magnetism to adjust the distance between the lens unit and the display unit.

[0012] In some embodiments, the driving member includes a coil wound along the circumference of the lens unit and a power source, the power source is electrically connected to the coil, and the magnetic member is a permanent magnet.

[0013] In some embodiments, the magnetic members are symmetrically arranged around the lens unit.

[0014] In some embodiments, the magnetic drive unit includes a driving member and a magnetic member, the magnetic member is fixedly connected to the bracket, the driving member is slidably connected to the bracket, the lens unit is connected to the driving member, and the driving member is configured to change the size and direction of its own magnetism to adjust the distance between the lens unit and the display unit.

[0015] In some embodiments, the display unit includes a first light emitting unit, a second light emitting unit, a third light emitting unit and a color combiner, the first light emitting unit, the second light emitting unit and the third light emitting unit have different light colors, and the color combiner is configured to combine the light emitted by the first light emitting unit, the second light emitting unit and the third light emitting unit.

[0016] In some embodiments, the display unit is a color display screen.

[0017] In some embodiments, the lens unit includes at least one lens.

[0018] An embodiment of the present application also provides a near-eye display device, comprising the above-mentioned light engine.

[0019] In some embodiments, the near-eye display device further includes an optical component, and the light engine is disposed corresponding to the optical component.

[0020] The light engine and near-eye display device provided in the embodiments of the present application include a bracket, a magnetic drive unit, a lens unit and a display unit. The magnetic drive unit is arranged on the bracket, the lens unit is connected to the magnetic drive unit, the display unit is connected to the bracket, and the display unit and the lens unit are arranged at intervals. The magnetic drive unit can move the drive lens unit to adjust the distance between the lens unit and the display unit, that is, the display unit can be adjusted to the focal position of the lens unit to compensate for the phenomenon that the virtual picture is unclear due to tolerance factors. Therefore, the distance between the display unit and the lens unit in the light engine in the present application can be adjusted, so that the virtual picture viewed by the user is more integrated with the real scene. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of a user without visual impairment viewing an object provided in an embodiment of the present application.

[0023] Figure 2 A schematic diagram of a visually impaired user viewing an object provided in an embodiment of the present application.

[0024] Figure 3 This is a schematic diagram of the first structure of the light engine provided in the embodiment of the present application.

[0025] Figure 4 This is a schematic diagram of the second structure of the light engine provided in the embodiment of the present application.

[0026] Figure 5 This is a third structural schematic diagram of the light engine provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0028] Light engines are also called optical machines or micro displays. Light engines can be installed in near-eye display devices, such as AR glasses. The light engine can provide users with virtual information. For example, the virtual information can be explanatory text, information labels, or animated portraits.

[0029] At the same time, the optical components of the near-eye display device are arranged corresponding to the light engine. The optical components can also allow the light of the real scene to enter the human eye, so that the user can perceive the fusion of virtual information and the real scene, such as text explanation and real-time translation of the real scene.

[0030] In order to better integrate virtual information into the real scene, for example, the imaging law of the convex lens in Table 1, the projection position of the display screen is as far as possible at infinity, that is, parallel light. At this time, the display screen is required to be as close as possible to the focal position of the lens unit of the light engine.

[0031] However, during the manufacturing process of the device, due to problems with tolerances, it is impossible to accurately set the object image exactly at the focal position of the lens unit, or at a position infinitely close to the focal position.

[0032] It is also worth noting that Figure 1 as well as Figure 2 , Figure 1 This is a schematic diagram of a user without visual impairment viewing an object provided in an embodiment of the present application. Figure 2 This is a schematic diagram of a user with visual impairment viewing an object provided in an embodiment of the present application. When a user without visual impairment views an object, the image of the object just falls on the retina 300. Figure 2 When the user has vision defects such as myopia, the object image position is in front of the retina 300, resulting in unclear imaging. This is because the lens 200 in the user's eye does not accurately refract light, resulting in blurred vision for the user. As shown in Table 1, the imaging law of the convex lens, the closer the object distance, the farther the image distance, so the distance between the object and the convex lens can be adjusted, for example, greater than one focal length and less than two focal lengths, so that the image distance increases and the object image falls on the retina 300, to meet the needs of users with different vision defects.

[0033] Table 1 Imaging rules of convex lenses

[0034] Object distance (u) Image distance (v) Upside down size Reality The positional relationship between the object and the image relative to the convex lens u>2f f<v<2f Handstand Zoom out Real Image Object image on the opposite side u=2f v=2f Handstand Equal size Real Image Object image on the opposite side f<u<2f v>2f Handstand enlarge Real Image Object image on the opposite side u=f No imaging Parallel light Imaging virtual and real dividing point — — in <f v>u Stand at attention enlarge virtual image Object and image on the same side

[0035] Where f is the focal length of the convex lens.

[0036] In summary, the embodiments of the present application provide a light engine and a near-eye display device, wherein the distance between the display unit and the lens unit in the light engine can be adjusted.

[0037] See also Figure 3 , Figure 3 This is a schematic diagram of the first structure of the light engine provided in the embodiment of the present application.

[0038] The light engine 100 includes a bracket 10, a magnetic drive unit 20, a lens unit 30 and a display unit 40. The magnetic drive unit 20 is disposed on the bracket 10, the lens unit 30 is connected to the magnetic drive unit 20, the display unit 40 is connected to the bracket 10, and the display unit 40 is spaced apart from the lens unit 30. The magnetic drive unit 20 is configured to drive the lens unit 30 to move so as to adjust the distance between the lens unit 30 and the display unit 40.

[0039] In order to make the user's viewing of the virtual image more integrated, the display image (object image) of the display unit 40 in the light engine 100 is set at the focus of the lens unit 30, so that the projection is located at infinity. When the myopic user cannot see the object in front of him clearly, the lens unit 30 is adjusted to a position where the distance from the object is greater than one focal length and less than two focal lengths, and the lens unit 30 is closer to the user, so that it is easier to make the image on the user's retina, and then the myopic user can see the virtual information clearly without wearing myopic glasses.

[0040] It should be noted that, in the present embodiment, a magnetic drive unit 20 is provided to drive the movement of the lens unit 30 to adjust the distance between the display unit 40 and the lens unit 30, so that the distance between the display unit 40 and the lens unit 30 can be automatically adjusted. Compared with the traditional manual adjustment or the fixed position of the two, the present application is more convenient and quick, and improves the user experience.

[0041] The magnetic drive unit 20 includes a drive member 21 and a magnetic member 22. The drive member 21 is fixedly connected to the bracket 10, the magnetic member 22 is slidably connected to the bracket 10, and the lens unit 30 is connected to the magnetic member 22. The drive member 21 is configured to change the size and direction of its own magnetism to adjust the distance between the lens unit 30 and the display unit 40. It can be understood that since the display unit 40 and the drive member 21 are both fixed on the bracket 10, and the magnetic member 22 can slide relative to the bracket 10, that is, the magnetic member 22 can slide relative to the drive member 21 and the display unit 40, and the magnetic member 22 is connected to the lens unit 30, the distance between the lens unit 30 and the display unit 40 can be changed, that is, the lens unit 30 can be adjusted to a position where the object distance with the display unit 40 is one times the focal length, or can be adjusted to a position where the object distance with the display unit 40 is greater than one times the focal length and less than two times the focal length.

[0042] The driving member 21 includes a coil wound along the circumference of the lens unit 30 and a power supply, and the coil is electrically connected to the power supply. The power supply supplies current to the coil so that the coil generates a magnetic field, and then the coil and the magnetic member 22 repel or attract each other, thereby adjusting the distance between the coil and the magnetic member 22. This phenomenon can be explained by Ampere's law (right-hand screw rule): for an energized solenoid, hold the solenoid with your right hand, with four fingers pointing in the direction of the current, and the end pointed by the thumb is the N pole of the solenoid. In the embodiment of the present application, the energized coil acts as an energized solenoid. According to Ampere's law, the magnitude or direction of the current can be changed, thereby adjusting the magnitude or direction of the magnetic field generated by the coil, and the magnitude or direction of the force acting on the magnetic member 22 by the magnetic field is also correspondingly different.

[0043] Among them, the coil can be a voice coil motor coil.

[0044] The magnetic member 22 is a permanent magnet. By changing the variable of the driving member 21, the force between the driving member 21 and the magnetic member 22 can be changed, so as to precisely adjust the distance between the lens unit 30 and the display unit 40.

[0045] The magnetic member 22 is symmetrically arranged around the lens unit 30 so that the driving member 21 can be evenly stressed.

[0046] In another case, the magnetic drive unit 20 includes a drive member 21 and a magnetic member 22, the magnetic member 22 is fixedly connected to the bracket 10, the drive member 21 is slidably connected to the bracket 10, the lens unit 30 is connected to the drive member 21, and the drive member 21 is configured to change the size and direction of its own magnetism to adjust the distance between the lens unit 30 and the display unit 40. The drive member 21 and the magnetic member 22 in this case can be the same as the drive member 21 and the magnetic member 22 in the above embodiment, and will not be repeated here. In this case, the distance between the magnetic member 22 and the drive member 21 is adjusted according to the reaction force of the action force generated by the movable drive member 21, and the distance between the lens unit 30 and the display unit 40 is further adjusted.

[0047] The display unit 40 may be a light emitting device such as LED, micro-LED, Micro LED, OLED, LCOS or FLCOS, etc. The display unit 40 is used to generate and emit an image light beam carrying image information.

[0048] In some cases, see Figure 4 , Figure 4A second structural diagram of the light engine 100 provided in an embodiment of the present application. The display unit 40 includes a first light-emitting unit 41, a second light-emitting unit 42, a third light-emitting unit 43 and a color combiner 44. The first light-emitting unit 41, the second light-emitting unit 42 and the third light-emitting unit 43 have different light colors, and the color combiner 44 is configured to combine the light emitted by the first light-emitting unit 41, the second light-emitting unit 42 and the third light-emitting unit 43. The color combiner 44 can be a prismatic structure. The first light-emitting unit 41, the second light-emitting unit 42 and the third light-emitting unit 43 are respectively located on different sides of the prismatic structure, and are merged into white light through the prismatic structure.

[0049] In other cases, see Figure 5 , Figure 5 This is a third structural schematic diagram of the light engine 100 provided in an embodiment of the present application. The display unit 40 is a color display screen 45 .

[0050] Furthermore, the lens unit 30 includes at least one lens 31. The lens 31 is used to transmit the image light beam emitted by the display unit 40 and adjust the propagation direction of the image light beam. The lens 31 can be a convex lens.

[0051] Optionally, the number of lenses 31 may be one or more. That is, the number of lenses 31 may be 1, 2, 3, 4 or even more, which is not limited here.

[0052] In this embodiment, the lens 31 may be spherical or aspherical, which is not limited here.

[0053] The embodiment of the present application also provides a near-eye display device. The near-eye display device includes an extended reality (ExtendedReality, XR) device, wherein the extended reality device includes virtual reality (VR), augmented reality (AR) and mixed reality (MR) devices. Among them, in the embodiment of the present application, the extended reality device at least includes a product in the form of glasses or a product in the form of a head-mounted display. Accordingly, the extended reality device should at least be an optically transparent product or a video-transmitting product.

[0054] The near-eye display device includes the light engine 100 in the above embodiment, which is also called an optical engine, a micro display, etc. It can be understood that since the near-eye display device includes the light engine 100 in the above embodiment, the near-eye display device has the advantages of the above light engine 100.

[0055] The near-eye display device further includes an optical component, which is disposed corresponding to the light engine 100. For example, the number of the optical components and the light engine 100 may be the same, and two optical components correspond to two light engines 100 one by one.

[0056] The light emitted by the light engine 100 can form virtual information (such as text or pictures) on the optical component. For example, the virtual information can be explanatory text, information labels or animated portraits. Similarly, the optical component can also allow the light of the real scene to enter the human eye, so that the user perceives the virtual information and the real scene are integrated together, such as text explanation of the real scene, real-time translation, etc.

[0057] The optical component may comprise a lens, a vision correction lens or a non-corrective lens. Examples of optical components that are corrective lenses include, for example, prescription glasses, bifocal glasses, reading glasses, driving glasses, and progressive glasses. Examples of optical components that are corrective or non-corrective lenses are sunglasses, adapter glasses, safety glasses, sports glasses, swimming masks or goggles, and ski goggles.

[0058] The near-eye display device may include a stand, which supports the optical components and the processor, etc., so as to facilitate wearing by the user.

[0059] In one embodiment, the near-eye display device includes a sensor, a circuit, and an output device. The glasses may also include one or both of a battery and a solar cell to provide power to the circuit and possible other components. Further, the glasses may also include communication capabilities.

[0060] The near-eye display device may also include wraparound glasses (with wraparound lenses), adaptable glasses, or auxiliary frames (attached to existing frames). Further, the near-eye display device may include a strap for glasses, such as a strap for fixing the near-eye display device to the user's head.

[0061] The light engine 100 and the near-eye display device provided in the embodiment of the present application include a bracket 10, a magnetic drive unit 20, a lens unit 30 and a display unit 40. The magnetic drive unit 20 is arranged on the bracket 10, the lens unit 30 is connected to the magnetic drive unit 20, the display unit 40 is connected to the bracket 10, and the display unit 40 is arranged at intervals from the lens unit 30. The magnetic drive unit 20 can drive the lens unit 30 to move to adjust the distance between the lens unit 30 and the display unit 40, that is, the display unit 40 can be adjusted to the focal position of the lens unit 30 to compensate for the tolerance so that the non-vision-impaired person can see more clearly, and can also be adjusted to between one and two focal lengths of the lens unit 30 to present an enlarged real image, which is convenient for users with vision impairment. Therefore, the distance between the display unit 40 and the lens unit 30 in the light engine 100 in the present application can be adjusted. It can adapt to the needs of different users and has universality.

[0062] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0063] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0064] The above is a detailed introduction to the light engine and near-eye display device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application. At the same time, for those skilled in the art, according to the ideas of the present application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A light engine, characterized in that: include: Bracket; A magnetic drive unit, wherein the magnetic drive unit is disposed on the bracket; A lens unit, wherein the lens unit is connected to the magnetic drive unit; A display unit, the display unit is connected to the bracket, and the display unit is spaced apart from the lens unit; The magnetic driving unit is configured to drive the lens unit to move so as to adjust the distance between the lens unit and the display unit.

2. The light engine according to claim 1, characterized in that: The magnetic drive unit includes a driving member and a magnetic member, the driving member is fixedly connected to the bracket, the magnetic member is slidably connected to the bracket, the lens unit is connected to the magnetic member, and the driving member is configured to change the size and direction of its own magnetism to adjust the distance between the lens unit and the display unit.

3. The light engine according to claim 2, characterized in that: The driving member includes a coil wound along the circumference of the lens unit and a power source, the power source is electrically connected to the coil, and the magnetic member is a permanent magnet.

4. The light engine according to claim 2, characterized in that: The magnetic member is symmetrically arranged on the peripheral side of the lens unit.

5. The light engine according to claim 1, characterized in that: The magnetic drive unit includes a driving member and a magnetic member, the magnetic member is fixedly connected to the bracket, the driving member is slidably connected to the bracket, the lens unit is connected to the driving member, and the driving member is configured to change the size and direction of its own magnetism to adjust the distance between the lens unit and the display unit.

6. The light engine according to any one of claims 1 to 5, characterized in that: The display unit includes a first light-emitting unit, a second light-emitting unit, a third light-emitting unit and a color combiner. The first light-emitting unit, the second light-emitting unit and the third light-emitting unit have different light-emitting colors. The color combiner is configured to combine the light emitted by the first light-emitting unit, the second light-emitting unit and the third light-emitting unit.

7. The light engine according to any one of claims 1 to 5, characterized in that: The display unit is a color display screen.

8. The light engine according to any one of claims 1 to 5, characterized in that: The lens unit includes at least one lens.

9. A near-eye display device, characterized in that: The light engine comprises the light engine described in any one of claims 1 to 8.

10. The near-eye display device according to claim 9, characterized in that: It also includes an optical component, and the light engine is arranged corresponding to the optical component.

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