CN110596901A - Miniature display module and head-mounted display device - Google Patents
Miniature display module and head-mounted display device Download PDFInfo
- Publication number
- CN110596901A CN110596901A CN201911016710.2A CN201911016710A CN110596901A CN 110596901 A CN110596901 A CN 110596901A CN 201911016710 A CN201911016710 A CN 201911016710A CN 110596901 A CN110596901 A CN 110596901A
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- Prior art keywords
- light
- assembly
- head
- distribution element
- display device
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- 230000003287 optical effect Effects 0.000 claims abstract description 22
- 239000011324 bead Substances 0.000 claims description 13
- 239000004973 liquid crystal related substance Substances 0.000 claims description 13
- 238000005401 electroluminescence Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 7
- 230000003190 augmentative effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133526—Lenses, e.g. microlenses or Fresnel lenses
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0118—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
Abstract
The invention relates to the technical field of head-mounted display devices, and discloses a micro display assembly and a head-mounted display device. The micro display assembly is configured to be used in a head-mounted display device and comprises a display screen and a light distribution element, wherein the light distribution element is located on a light emergent path of the display screen and is configured to reduce a light emergent angle of emergent light of the display screen, so that the light emergent angle is smaller than or equal to 45 degrees. The micro display assembly is applied to the head-mounted display device, the light energy utilization rate of the head-mounted display device can be greatly improved, and the head-mounted display device adopting the display assembly can obtain obviously higher viewing brightness under the same power consumption, or can obviously reduce the power consumption when the same viewing brightness is obtained. In addition, the head-mounted display device adopting the display assembly can obviously reduce the stray light interference of the optical system, thereby obtaining better viewing experience.
Description
Technical Field
The invention relates to the technical field of head-mounted display devices, in particular to a micro display assembly and a head-mounted display device.
Background
In the prior art, a micro display screen is used in head-mounted display devices of virtual reality, augmented reality and mixed reality. For the current display application of virtual reality, augmented reality or mixed reality, it is a more common market pursuit to enhance the brightness and contrast of the display picture and improve the display experience.
Disclosure of Invention
The invention discloses a display assembly and a head-mounted display device, and aims to improve the light energy utilization rate of a head-mounted display, enhance the brightness and contrast of a display picture and improve the viewing experience.
In order to achieve the purpose, the invention provides the following technical scheme:
a miniature display module is configured to be used in a head-mounted display device and comprises a display screen and a light distribution element, wherein the light distribution element is located on a light emergent light path of the display screen and is configured to reduce a light emergent angle of emergent light of the display screen, so that the light emergent angle is smaller than or equal to 45 degrees.
Head-mounted display devices in the prior art generally include a micro display screen and an optical projection assembly for projecting an image onto an eye; in the conventional head-mounted display device, the light-emitting angle of the micro display screen is close to 90 °, however, the inventor has found through research that, in the conventional head-mounted display device, only a part of light rays with a smaller light-emitting angle in the emergent light rays of the micro display screen finally reach eyes through projection, the emergent light rays with a larger light-emitting angle are almost wasted, and because the head-mounted display device has a closed optical environment, the part of light rays cause stray light in the head-mounted display device to interfere with viewing experience.
The display component is a miniature display component, and can be particularly applied to head-mounted display equipment; in the display module, the emergent light of the display screen is almost concentrated in the emergent light angle of 45 degrees by arranging the light distribution element, so that most emergent light of the display module can be projected to eyes through the optical projection module. After the display assembly is applied to the head-mounted display device, compared with the traditional head-mounted display device, the light energy utilization rate can be greatly improved, and the significantly higher viewing brightness can be obtained under the same power consumption, or when the same viewing brightness is obtained, the head-mounted display device adopting the display assembly can significantly reduce the power consumption. In addition, because the display assembly of the invention greatly eliminates the light rays with large light-emitting angles, the interference stray light caused by the light rays in the head-mounted display device can be effectively avoided, therefore, the head-mounted display device adopting the display assembly of the invention can obviously reduce the stray light interference of an optical system, improve the contrast and the definition of a viewed picture, and further obtain better viewing experience. In summary, the display assembly provided in the embodiments of the present invention can be used in a head-mounted display device to improve the light energy utilization of the head-mounted display device, obtain higher viewing brightness and contrast, and improve viewing experience.
Optionally, the light distribution element includes a lens assembly, a prism film assembly, or a combination of both.
Optionally, the display screen includes a liquid crystal display panel and a backlight source for providing backlight for the liquid crystal display panel, and the light distribution element is disposed between the backlight source and the liquid crystal display panel.
Optionally, the backlight source is a direct type backlight source and comprises LED lamp beads distributed in an array;
the light distribution element comprises a lens assembly, the lens assembly comprises lens groups in one-to-one correspondence with the LED lamp beads, and each lens group comprises at least one lens with an optical axis coinciding with the corresponding optical axis of the LED lamp beads.
Optionally, the distance between each lens group and the corresponding LED lamp bead is greater than or equal to 10 mm.
Optionally, the light distribution element includes a prism film assembly, the prism film assembly includes a layer of prism film, a vertex angle of the prism film is greater than or equal to 110 degrees, and a refractive index of the prism film is greater than or equal to 1.5.
Optionally, the prism film has a vertex angle greater than or equal to 120 degrees and a refractive index greater than or equal to 1.56.
Optionally, the display screen is an organic electroluminescent display screen;
the light distribution element is arranged on the light emergent surface of the organic electroluminescence display screen.
Optionally, the light distribution element is configured to reduce a light exit angle of the emergent light of the display screen, so that the light exit angle is less than or equal to 25 degrees.
Optionally, the light distribution element is configured to reduce a light exit angle of the emergent light of the display screen, so that the light exit angle is less than or equal to 15 degrees.
A head-mounted display device comprising the microdisplay assembly of any of the above.
Drawings
Fig. 1 is a schematic structural diagram of a display module according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a display module according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a display module according to another embodiment of the present invention;
FIG. 4 is a schematic view of a light-emitting angle of a display screen;
fig. 5 is a schematic optical path diagram of a head-mounted display device according to an embodiment of the present invention;
fig. 6 is a schematic optical path diagram of a head-mounted display device according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In a first aspect, as shown in fig. 1 to 3, an embodiment of the present invention provides a micro display module configured to be used in a head-mounted display device, the micro display module including a display screen 1 and a light distribution element 2, wherein the light distribution element 2 is located on an outgoing light path of the display screen 1, and is configured to reduce an outgoing light angle of outgoing light of the display screen 1, so that the outgoing light angle is less than or equal to 45 degrees.
Specifically, the 'light-emitting path of the display screen' includes all light paths from a light source in the display screen to exit from the display screen and reach a next device (generally referred to as an optical projection assembly). The 'light-emitting angle' is an included angle between the emergent light and an axis perpendicular to the display screen 1; as shown in fig. 4, N is an axis perpendicular to the display screen 1, or referred to as a normal, and an included angle a between the outgoing light ray P and the normal N is a light-emitting angle of the light ray P; similarly, the included angle a between the outgoing light ray Q and the normal N is the light-emitting angle of the light ray Q. Specifically, in actual operation, the outgoing light cannot be concentrated in the range of 45 degrees by one hundred percent, and in this application, 'making the outgoing light angle less than or equal to 45 degrees' may be regarded as meaning that at least 90% or more of the outgoing light is concentrated in the outgoing light angle less than or equal to 45 degrees, and similarly, 'making the outgoing light angle less than or equal to 25 degrees/15 degrees' or the like, which will be described later, may also be understood as follows.
Head-mounted display devices in the prior art generally include a micro display screen and an optical projection assembly for projecting an image onto an eye; in the conventional head-mounted display device at present, the light-emitting angle of a micro display screen approaches 90 degrees; however, the inventor has found that, in the conventional head-mounted display device at present, only a part of the emergent light of the micro display screen with a small emergent angle finally reaches the eyes through projection, the emergent light with the large emergent angle is almost wasted, and because the head-mounted display device has a closed optical environment, the part of the emergent light causes interference stray light in the head-mounted display device, which affects the viewing experience.
The display component is a miniature display component, and can be particularly applied to head-mounted display equipment; in this display module, the light distribution element is arranged, so that the emergent light of the display screen can be almost concentrated in the emergent angle of 45 degrees, and therefore, as shown in fig. 5 and 6, most of the emergent light of the micro-display module 3 provided by the embodiment of the present invention can be projected onto the eyes 5 through the optical projection module 4. After the display assembly is applied to the head-mounted display device, compared with the traditional head-mounted display device, the light energy utilization rate can be greatly improved, and the significantly higher viewing brightness can be obtained under the same power consumption, or when the same viewing brightness is obtained, the head-mounted display device adopting the display assembly can significantly reduce the power consumption. In addition, because the display assembly greatly eliminates the light rays with large light-emitting angles, the interference stray light caused by the light rays in the head-mounted display device can be effectively avoided, therefore, the head-mounted display device adopting the display assembly can obviously reduce the stray light interference of an optical system, improve the contrast and the definition of a viewed picture, and further obtain better viewing experience. In summary, the display module provided in the embodiments of the present invention can be applied to a head-mounted display device to improve the light energy utilization of the head-mounted display device, improve the contrast and the definition of a viewed image, and obtain better viewing experience.
In a specific embodiment, the light distribution element may include a prismatic film assembly (BEF), a lens assembly, or a combination of both.
Illustratively, the light distribution element is arranged on a light emergent path of the display screen. The prism film component can comprise a layer of prism film, and also can comprise a combination of two or more layers of prism films which are arranged in sequence along the direction of the light path; the lens assembly may comprise one lens or lens group, or may comprise a plurality of lenses or lens groups arranged in an array.
Specifically, the light can be converged by the prism film assembly and/or the lens assembly, so that the light-emitting angle of the emergent light of the display screen is reduced to a set range.
As shown in fig. 1 and 2, in an alternative embodiment, the display screen 1 may be a liquid crystal display screen; the display panel 1 includes a liquid crystal display panel 11 and a backlight 12 for providing backlight for the liquid crystal display panel 11, and the light distribution element 2 may be disposed between the backlight 12 and the liquid crystal display panel 11.
In a specific embodiment, as shown in fig. 1, the backlight 12 is a direct-type backlight, and includes LED beads 121 distributed in an array; the light distribution element 2 comprises a lens assembly, the lens assembly comprises lens groups 21 corresponding to the LED lamp beads 121 one by one, each lens group 21 comprises at least one lens 211, and the optical axis of each lens 21 is overlapped with the optical axis of the corresponding LED lamp bead 121.
Specifically, the distance between each lens group 21 and the corresponding LED lamp bead 121 is greater than or equal to 10mm, so that the lens groups 21 can better perform the light converging function. The liquid crystal display panel 11 and the lens group 21 are also spaced apart by a proper distance, so that the divergent light rays emitted by the light distribution lens group 21 can uniformly cover the liquid crystal display panel 11, and the requirement of display brightness uniformity is met.
In another specific embodiment, as shown in fig. 2, the light distribution element 2 includes a prism film assembly, and the prism film assembly includes a prism film 22, and the prism film 22 is disposed between the backlight 12 and the liquid crystal display panel 11; the apex angle r of the prism film 22 is greater than or equal to 110 degrees, and the refractive index of the prism film 22 is greater than or equal to 1.5. Specifically, the arrangement of the vertex angle and the refractive index of the prism film enables light rays meeting the angle requirement (the emergent angle is within 45 degrees) to be refracted out, and light rays exceeding the angle are reflected back to the backlight system to be recycled until the light rays are led out at the angle meeting the requirement.
Illustratively, the prism film 22 has a vertex angle r greater than or equal to 120 degrees and a refractive index greater than or equal to 1.56. At this time, simulation results show that the light energy ratio of the light-emitting angle less than 45 degrees can reach 91% or more, namely at least 91% of the emergent light is concentrated in the light-emitting angle less than or equal to 45 degrees.
Specifically, the light distribution element 2 may also include the lens group 21 corresponding to the LED lamp beads 121 one to one, and the prism film 22, which may be determined according to the requirement of the light emitting angle in practical application.
Of course, alternatively, the display screen 1 may also be an organic electroluminescent display screen 1; as shown in fig. 3, in this case, the light distribution element 2 is disposed on the light exit surface side of the organic electroluminescence display panel 1.
In a specific embodiment, the light distribution element is configured to reduce the light exit angle of the emergent rays of the display screen, so that the light exit angle is less than or equal to 25 degrees, that is, the light exit angle of at least 90% of the emergent rays is less than or equal to 25 degrees. Specifically, when the light distribution element is a lens assembly, the specific number, model and spacing of the lenses in the lens assembly can be adjusted, so that the light-emitting angle of more than 90% of emergent light of the display assembly is smaller than or equal to 25 degrees. Or, when the light distribution element is a prism film assembly, the light-emitting angle of more than 90% of emergent light rays can be smaller than or equal to 25 degrees by adjusting the number, the vertex angle and the refractive index of the prism films which are sequentially arranged along the light path direction.
FIG. 5 is a schematic diagram of a display optical path of a head-mounted display device; as shown in fig. 5, in the head-mounted display device, only the light rays with the light-emitting angle smaller than 20 ° of the emergent light rays of the display module 3 can reach the eye 5 through projection; the simulation analysis shows that the light-emitting angle of the emergent light of the display component 3 is set to be less than or equal to 25 degrees, and compared with the common light-emitting angle range of 80 degrees, the former brightness is 8.8 times of the latter brightness when the human eyes watch the emergent light; meanwhile, stray light interference is obviously weakened, and the viewing experience can be obviously improved.
In another specific embodiment, the light distribution element is configured to reduce the light exit angle of the emergent rays of the display screen, so that the light exit angle is less than or equal to 15 degrees, that is, the light exit angle of at least 90% of the emergent rays is less than or equal to 15 degrees. Specifically, when the light distribution element is a lens assembly, the specific number, model and spacing of the lenses in the lens assembly can be adjusted, so that the light-emitting angle of more than 90% of emergent light of the display assembly is smaller than or equal to 15 degrees. Or, when the light distribution element is a prism film assembly, the light-emitting angle of more than 90% of emergent light rays can be smaller than or equal to 15 degrees by adjusting the number, the vertex angle and the refractive index of the prism films which are sequentially arranged along the light path direction.
FIG. 6 is a schematic diagram of a display optical path of another head mounted display device; as shown in fig. 6, in the head-mounted display device, only the light rays with the light-emitting angle smaller than 11 ° of the emergent light rays of the display module 3 can reach the eye 5 through projection; the simulation analysis shows that the light-emitting angle of the emergent light of the display component 3 is set to be less than or equal to 15 degrees, and compared with the common light-emitting angle range of 80 degrees, the former brightness is 24 times of the latter brightness when the human eyes watch the emergent light; meanwhile, stray light interference is obviously weakened, and the viewing experience can be remarkably improved.
In a second aspect, an embodiment of the present invention further provides a head-mounted display device, including the display assembly described in any one of the above.
Specifically, as shown in fig. 5 and 6, the head-mounted display device provided by the embodiment of the invention further includes an optical projection assembly 4, where the optical projection assembly 4 is located between the display assembly 3 and the eye 5, and is used for magnifying the image of the display screen and projecting the image on the eye 5.
For example, the head-mounted display device provided by the embodiment of the invention may be a Virtual Reality (VR) head-mounted display device, an Augmented Reality (AR) head-mounted display device, or a Mixed Reality (MR) head-mounted display device.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. A miniature display assembly is characterized by being used in a head-mounted display device and comprising a display screen and a light distribution element, wherein the light distribution element is positioned on a light emergent light path of the display screen and is configured to reduce the light emergent angle of emergent light rays of the display screen, so that the light emergent angle is smaller than or equal to 45 degrees.
2. The microdisplay assembly of claim 1 wherein the light distribution element comprises a lens assembly, a prismatic film assembly, or a combination of both.
3. The microdisplay assembly of claim 2 wherein the display panel comprises a liquid crystal display panel and a backlight for providing backlighting to the liquid crystal display panel, and the light distribution element is disposed between the backlight and the liquid crystal display panel.
4. The microdisplay assembly of claim 3 wherein the backlight is a direct-lit backlight comprising an array of LED light beads;
the light distribution element comprises a lens assembly, the lens assembly comprises lens groups in one-to-one correspondence with the LED lamp beads, and each lens group comprises at least one lens with an optical axis coinciding with the corresponding optical axis of the LED lamp beads.
5. The microdisplay assembly of claim 4 wherein the distance between each lens group and the corresponding LED lamp bead is greater than or equal to 10 mm.
6. A microdisplay assembly according to claim 3 wherein the light distribution element comprises a prismatic film assembly comprising a layer of prismatic film having a vertex angle of greater than or equal to 110 degrees and a refractive index of greater than or equal to 1.5.
7. The microdisplay assembly of claim 6 in which the prismatic film has a vertex angle of 120 degrees or greater and a refractive index of 1.56 or greater.
8. The microdisplay assembly of claim 2 wherein the display is an organic electroluminescent display;
the light distribution element is arranged on the light emergent surface of the organic electroluminescence display screen.
9. The microdisplay assembly of any of claims 1-8 wherein the light distribution element is configured to reduce the exit angle of the emerging light from the display screen such that the exit angle is less than or equal to 25 degrees.
10. The microdisplay assembly of any of claims 1-8 wherein the light distribution element is configured to reduce the exit angle of the emerging light from the display screen such that the exit angle is less than or equal to 15 degrees.
11. A head-mounted display device comprising the microdisplay assembly of any one of claims 1-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911016710.2A CN110596901A (en) | 2019-10-24 | 2019-10-24 | Miniature display module and head-mounted display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911016710.2A CN110596901A (en) | 2019-10-24 | 2019-10-24 | Miniature display module and head-mounted display device |
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| Publication Number | Publication Date |
|---|---|
| CN110596901A true CN110596901A (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911016710.2A Pending CN110596901A (en) | 2019-10-24 | 2019-10-24 | Miniature display module and head-mounted display device |
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| CN (1) | CN110596901A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021147963A1 (en) * | 2020-01-23 | 2021-07-29 | 京东方科技集团股份有限公司 | Display assembly, display device, and vr/ar display apparatus |
| WO2023070542A1 (en) * | 2021-10-29 | 2023-05-04 | 京东方科技集团股份有限公司 | Display module and display device |
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| TW200623961A (en) * | 2004-12-17 | 2006-07-01 | Hon Hai Prec Ind Co Ltd | Organic light-emitting display |
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| CN102279465A (en) * | 2011-07-22 | 2011-12-14 | 上海丽恒光微电子科技有限公司 | Display device, projection device and near sight display device and forming method thereof |
| WO2013085129A1 (en) * | 2011-12-06 | 2013-06-13 | 제일모직 주식회사 | Backlight for autostereoscopic three-dimensional display |
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| TW200623961A (en) * | 2004-12-17 | 2006-07-01 | Hon Hai Prec Ind Co Ltd | Organic light-emitting display |
| CN201739948U (en) * | 2010-08-20 | 2011-02-09 | 北京京东方光电科技有限公司 | Prism film, backlight film set and LCD |
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| WO2021147963A1 (en) * | 2020-01-23 | 2021-07-29 | 京东方科技集团股份有限公司 | Display assembly, display device, and vr/ar display apparatus |
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Country or region after: China Address after: Room 5, 5th Floor, Jufeng Optical Medical Equipment Industrial Park, No. 120 Keyuan Weisi Road, Laoshan District, Qingdao City, Shandong Province, 266000 Applicant after: Lexiang Technology Co.,Ltd. Address before: 200125 floor 1, building 3, No. 239, Mindong Road, Pudong New Area, Shanghai Applicant before: SHANGHAI LEXIANG TECHNOLOGY Co.,Ltd. Country or region before: China |