CN107657902B - Integrated vehicle-mounted bidirectional L ED electronic display - Google Patents
Integrated vehicle-mounted bidirectional L ED electronic display Download PDFInfo
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- CN107657902B CN107657902B CN201710975380.4A CN201710975380A CN107657902B CN 107657902 B CN107657902 B CN 107657902B CN 201710975380 A CN201710975380 A CN 201710975380A CN 107657902 B CN107657902 B CN 107657902B
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 27
- 238000004891 communication Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000017525 heat dissipation Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920001690 polydopamine Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
- B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
- B60R11/0229—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof for displays, e.g. cathodic tubes
- B60R11/0235—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof for displays, e.g. cathodic tubes of flat type, e.g. LCD
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/202—Air circulating in closed loop within enclosure wherein heat is removed through heat-exchangers
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20954—Modifications to facilitate cooling, ventilating, or heating for display panels
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
An integrated vehicle-mounted bidirectional L ED electronic display L ED comprises the electronic display, a transparent plate, a heat conducting plate, an open airflow channel, a closed circulating airflow channel and an integrated shell, the heat dissipation effect of the display is enhanced on the premise of not influencing the display effect of an L ED electronic display, the service life of the display is prolonged, meanwhile, the integrated vehicle-mounted bidirectional L ED electronic display is improved, the structure is simple, the assembly process is improved in the production process, and meanwhile, the safety of the display in the vehicle-mounted use process is improved.
Description
Technical Field
The invention relates to the technical field of electronic displays, in particular to an integrated vehicle-mounted bidirectional L ED electronic display.
Background
A L ED electronic display is a display screen used for displaying various information such as characters, graphs, images, animation, quotation, videos and video signals by controlling the display mode of a semiconductor light emitting diode. L ED has the technical progress which is the biggest driving force for expanding market demands and application. L ED is only used as a micro indicator lamp and is applied to high-grade equipment such as computers, audios and video recorders, along with the continuous progress of large-scale integrated circuits and computer technologies, a L ED display is rapidly growing up and gradually expanding to the fields of stock market tickers, digital cameras, PDAs, mobile phones and the like. L ED display integrates microelectronic technologies, computer technologies and information processing into a whole and becomes the most advantageous new generation display medium due to the advantages of bright color, wide dynamic range, high brightness, long service life, stable and reliable work and the like, and L ED display is widely applied to large squares, commercial advertisements, stadiums, information dissemination, news release, securities and the like.
However, since L ED semiconductor generates a lot of heat during operation, if it cannot be evacuated in time or improperly evacuated, it will directly affect the display effect of L ED electronic display, and seriously will directly damage the display.
Disclosure of Invention
The invention aims to solve the defects of the prior art, the integrated vehicle-mounted bidirectional L ED electronic display is improved, the heat dissipation effect of the display is enhanced on the premise of not influencing the display effect of the L ED electronic display, the service life of the display is prolonged, and meanwhile, the improved vehicle-mounted bidirectional L ED electronic display is simple in structure, improves the assembly process in the production process and improves the safety of the display in the vehicle-mounted use process.
In order to realize the aim of the invention, the technical measures are as follows:
the integrated vehicle-mounted bidirectional L ED electronic display comprises an electronic display, a transparent plate, a heat conducting plate, an open airflow channel, a closed circulating airflow channel and an integrated shell part:
the electronic display includes: the first electronic display and the second display are fixed in a back direction;
the transparent plate includes: the first transparent plate and the second transparent plate are respectively fixed in front of the display ends of the first electronic display and the second display;
a heat conducting plate: the first heat conducting plate and the second heat conducting plate are respectively arranged behind the first electronic display and the second electronic display;
open airflow channel: the first heat conducting plate and the second heat conducting plate are arranged between the first heat conducting plate and the second heat conducting plate;
closed circulation gas flow channel: a first circulating airflow channel formed between the first transparent plate and the first electronic display, between the first electronic display and the first heat-conducting plate, and a second circulating airflow channel formed between the second transparent plate and the second electronic display, between the second electronic display and the second heat-conducting plate;
the integrated shell piece is as follows: the integrated shell piece surrounds the peripheries of the first and second transparent plates, the first and second electronic displays, the first heat conducting plate and the second heat conducting plate, so that the closed circulating airflow channel is formed between the transparent plates, the display and the heat conducting plates, and the open airflow channel is formed between the first heat conducting plate and the second heat conducting plate.
The invention relates to an integrated vehicle-mounted bidirectional L ED electronic display, wherein an integrated shell member, a transparent plate, a display and a heat conducting plate form a closed circulating airflow channel, wherein the first transparent plate and the first display form a first A cavity, a first B cavity is formed between the first display and the first heat conducting plate, the second transparent plate and the second display form a second A cavity, a second B cavity is formed between the second display and the second heat conducting plate, and the upper part and the lower part of the A cavity and the B cavity are respectively provided with an airflow channel which is respectively used for airflow conduction between the first A cavity and the first B cavity and airflow conduction between the second A cavity and the second B cavity.
The invention relates to an integrated vehicle-mounted bidirectional L ED electronic display, wherein an integrated shell member comprises a fastener for fastening the display to a vehicle body, the fastener comprises a first fastener and a second fastener, one fastener comprises a wing, the wing is connected with one fastener and extends to the side wall of a frame of the other fastener, an upper frame connected with the fastener is pressed on the inner side, the integrated shell member comprises two frames, each frame is provided with one wing, the first frame corresponds to the first wing, the second frame corresponds to the second wing, the wing and the frame are as wide as each other, and the thickness of the wing is less than or equal to that of the frame.
According to the integrated vehicle-mounted bidirectional L ED electronic display, air flow between the first A cavity and the first B cavity is conducted to form first air flow, air flow between the second A cavity and the second B cavity is conducted to form second air flow, and the flow directions of the first air flow and the second air flow are vertical to the horizontal plane and respectively surround the first display and the second display.
The integrated vehicle-mounted bidirectional L ED electronic display is characterized in that a closed communicating pipe is arranged between the first cavity B and the second cavity B, one end of an opening of the closed communicating pipe corresponds to the first cavity B and is in sealed communication with the first cavity B, the other end of the opening of the closed communicating pipe corresponds to the second cavity B and is in sealed communication with the second cavity B, and the communicating pipe is used for gas communication between the first cavity B and the second cavity B.
The invention relates to an integrated vehicle-mounted bidirectional L ED electronic display, wherein a gas accelerator is arranged in a closed intercommunicating pipe.
The invention relates to an integrated vehicle-mounted bidirectional L ED electronic display, wherein two gas accelerators are arranged in a closed communicating pipe, and the two gas accelerators are fixed in a back-to-back mode.
The invention relates to an integrated vehicle-mounted bidirectional L ED electronic display, wherein an open airflow channel further comprises an airflow accelerator.
The invention relates to an integrated vehicle-mounted bidirectional L ED electronic display, wherein airflow in an open airflow channel accelerated by an airflow accelerator flows to a direction vertical to a heat conducting plate.
The invention relates to an integrated vehicle-mounted bidirectional L ED electronic display, wherein the number of airflow accelerators is two, the two airflow accelerators are fixed in the middle of an open airflow channel in a back-to-back manner, the first airflow accelerator faces to a first heat-conducting plate, the airflow direction is vertical to the first heat-conducting plate, the second airflow accelerator faces to a second heat-conducting plate, and the airflow direction is vertical to the second heat-conducting plate.
The invention at least comprises the following beneficial effects:
the integrated vehicle-mounted bidirectional L ED electronic display directly assembles two electronic displays fixed back to back, the transparent plate arranged in front of the display and the heat conducting plate arranged behind the display on a vehicle through the integrated shell, and the integrated housing piece, the display, the transparent plate and the heat conducting plate directly form an open airflow channel and a closed circulating airflow channel of the integrated vehicle-mounted bidirectional L ED electronic display, so that the integrated vehicle-mounted bidirectional L ED electronic display is convenient to assemble and simple in structure, the safety of the vehicle-mounted display is improved, and the cost of the integrated vehicle-mounted bidirectional L ED electronic display is saved.
The invention relates to an integrated vehicle-mounted bidirectional L ED electronic display, which comprises an integrated shell part, a display, a transparent plate and a heat conducting plate, wherein a closed circulating airflow channel is formed by the integrated shell part, the display, the transparent plate and the heat conducting plate, airflow in a closed loop continuously circulates from the front of the display to the back of the display in the operation process of a L ED electronic display by utilizing an airflow heat exchange principle, heat is transmitted to the heat conducting plate in the process of continuous directional circulating airflow, the heat conducting plate after heat absorption utilizes an open airflow channel to quickly disperse the heat into outside airflow in time, and on the other hand, the first A cavity, the first B cavity, the second A cavity and the second B cavity are respectively provided with an air channel for airflow conduction between the first A cavity and the first B cavity and airflow conduction between the second A cavity and the second B cavity, so that the airflow in the closed circulating airflow channel is fully contacted with the display, and the heat energy dispersion of the display is further improved.
The integrated vehicle-mounted bidirectional L ED electronic display disclosed by the invention has the advantages that the closed circulating airflow channel is utilized, so that the heat of the display in the working process can be timely led out, the display can be prevented from being directly contacted with the external environment, the display belongs to a sensitive device, any trace and small amount of dust, H2O and other pollutants can influence the display, the influence of the external environment, airflow, dust and the like on the display is directly isolated by utilizing the closed circulating airflow channel, and the service life of the display is prolonged.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
The drawings are included to further explain the present invention and are not intended to limit the scope of the invention.
Fig. 1 is a simplified schematic diagram of an integrated vehicle-mounted bidirectional L ED electronic display according to the present invention.
FIG. 2 is a schematic side sectional view of an integrated vehicular bidirectional L ED electronic display according to the present invention.
Fig. 3 is a schematic structural diagram a of the integrated housing component of the present invention.
Fig. 4 is a schematic structural diagram B of the integrated housing component of the present invention.
FIG. 5 is a schematic view of the structure of the upper wing of the frame of the integrated housing member of the present invention.
Detailed Description
The present invention is further described in detail below with reference to specific embodiments so that those skilled in the art can implement the invention without limiting the scope of the invention by referring to the description text.
In this specification, when an element is referred to as being "secured to" another element, it can be "directly" connected to the other element or "indirectly" connected to the other element, or be secured to the other element without being connected. The term "integral" as used herein refers to an element that is integrally formed, does not require any additional elements to connect the internal components of the element, and the like. The closed circulating airflow channel is a channel which does not exchange air with the outside, the channel is a sealed channel, and the airflow in the channel is in a regular circulating flow state. The open airflow channel is an airflow channel communicated with the external environment, or is directly integrated into the external environment, or at least must be capable of exchanging air with the external environment.
Example 1
As shown in fig. 1, the first electronic display 21 and the second electronic display 22 are fixed back to form a bidirectional L ED electronic display, the first transparent plate 11 is disposed in front of the display end of the first electronic display 21, the first heat conducting plate 31 is disposed behind the first electronic display 21, the first transparent plate 12 is disposed in front of the display end of the first electronic display 22, and the first heat conducting plate 32 is disposed behind the first electronic display 22, as shown in fig. 2, the first transparent plate 11 and the first display 21 form a first a cavity 41, a first B cavity 51 is formed between the first display 21 and the first heat conducting plate 31, the second transparent plate 12 and the second display 22 form a second a cavity 42, a second B cavity 52 is formed between the second display 22 and the second heat conducting plate 32, gas channels are disposed above and below the a cavity and the B cavity, the gas channels for conducting the gas flow between the first a cavity 41 and the first B cavity 51 are an upper gas channel 61 of the first AB cavity, a lower gas channel 71 and a lower gas channel 82, the gas channel for conducting the gas flow of the first a closed gas channel 81 and the second gas channel 82, the gas channel 71 and the second gas channel 71 are a closed, the gas channel 71 and the gas channel 71, the gas channel for conducting the gas channel is a closed, the gas channel is a channel, the gas channel is a channel, the gas channel is a channel, the gas channel is a channel, the gas channel is a channel, the gas channel is closed, the gas channel, the gas.
Example 2
As shown in fig. 3, the integrated housing member 9 includes a first fastening member 91, a second fastening member 92, and a first frame 94 and a second frame 95 fixed to the monitor, the transparent plate, and the heat conducting plate, wherein the monitor, the transparent plate, the heat conducting plate, etc. are placed in the opened first fastening member 91 and second fastening member 92, and then the first fastening member 91 and second fastening member 92 are fastened by screws, and then the first fastening member 91 or second fastening member 92 is fixed to the vehicle body by screws, or the first fastening member 91 and second fastening member 92 are fixed to the vehicle body at the same time. The integrated shell member of the present invention has a simple structure, is convenient to assemble, is beneficial to industrial production, and is low in cost, and in order to further improve the sealing performance of the integrated shell member 9, as shown in fig. 4, the first fastening member 91 or the second fastening member 92 further comprises a wing 93, the wing 93 is connected with one of the fastening members, extends to the frame side wall of the other fastening member, and the upper frame 96 connected with the fastening member is pressed to the inner side. As shown in fig. 5, the wings 93 are formed as parts of frames, each of which is provided with one wing, the first frame 94 corresponds to the first wing 931, the second frame 95 corresponds to the second wing 932, and the wings are as wide as the frames and have a thickness equal to or less than the frames.
It is obvious that those skilled in the art can obtain various effects not directly mentioned according to the respective embodiments without trouble from various structures according to the embodiments of the present invention.
While the invention/embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
Claims (1)
1. An integrated vehicle-mounted bidirectional L ED electronic display is characterized by comprising an electronic display, a transparent plate, a heat conducting plate, an open airflow channel, a closed circulating airflow channel and an integrated shell part:
the electronic display includes: the first electronic display and the second display are fixed in a back direction;
the transparent plate includes: the first transparent plate and the second transparent plate are respectively fixed in front of the display ends of the first electronic display and the second display;
a heat conducting plate: the first heat conducting plate and the second heat conducting plate are respectively arranged behind the first electronic display and the second electronic display;
open airflow channel: the first heat conducting plate and the second heat conducting plate are arranged between the first heat conducting plate and the second heat conducting plate;
closed circulation gas flow channel: a first circulating airflow channel formed between the first transparent plate and the first electronic display, between the first electronic display and the first heat-conducting plate, and a second circulating airflow channel formed between the second transparent plate and the second electronic display, between the second electronic display and the second heat-conducting plate;
the integrated shell piece is as follows: the shell part is used for fixing the electronic display, the transparent plate, the open type airflow channel and the closed type circulating airflow channel on the vehicle, and surrounds the first transparent plate, the second transparent plate, the first electronic display, the second electronic display, the first heat conducting plate and the second heat conducting plate, so that the closed type circulating airflow channel is formed between the transparent plate, the display and the heat conducting plates, and the open type airflow channel is formed between the first heat conducting plate and the second heat conducting plate;
the closed circulating airflow channel is formed by the integrated shell piece, the transparent plate, the display and the heat conducting plate, wherein the first transparent plate and the first display form a first A cavity, a first B cavity is formed between the first display and the first heat conducting plate, the second transparent plate and the second display form a second A cavity, a second B cavity is formed between the second display and the second heat conducting plate, and the gas channels are respectively arranged above and below the A cavity and the B cavity and are respectively used for conducting airflow between the first A cavity and the first B cavity and conducting airflow between the second A cavity and the second B cavity; the airflow between the first cavity A and the first cavity B is conducted to form first airflow, and the airflow between the second cavity A and the second cavity B is conducted to form second airflow, wherein the flow directions of the first airflow and the second airflow are vertical to the horizontal plane and respectively surround the first display and the second display; a closed communicating pipe is arranged between the first cavity B and the second cavity B, one end of an opening of the closed communicating pipe corresponds to the first cavity B and is in sealed communication with the first cavity B, the other end of the opening of the closed communicating pipe corresponds to the second cavity B and is in sealed communication with the second cavity B, and the communicating pipe is used for gas communication between the first cavity B and the second cavity B;
the integrated shell piece comprises a fastener for fastening the display to the vehicle body, the fastener comprises a first fastener and a second fastener, one fastener comprises a wing, the wing is connected with one fastener and extends to the side wall of the frame of the other fastener, the upper frame connected with the fastener is pressed on the inner side, the integrated shell piece comprises two frames, each frame is provided with one wing, the first frame corresponds to the first wing, the second frame corresponds to the second wing, the wing is as wide as the frame, and the thickness of the wing is less than or equal to that of the frame;
a gas accelerator is arranged in the closed intercommunicating pipe;
the number of the gas accelerators in the closed communicating pipe is two, and the two gas accelerators are fixed in a back-to-back manner;
the open type airflow channel further comprises an airflow accelerator;
the flow direction of the airflow in the open airflow channel accelerated by the airflow accelerator is vertical to the heat conducting plate;
the two airflow accelerators are fixed in the middle of the open airflow channel in a back-to-back manner, the first airflow accelerator faces the first heat-conducting plate, and the airflow direction is vertical to the first heat-conducting plate; the second airflow accelerator faces the second heat conducting plate, and the airflow direction is perpendicular to the second heat conducting plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710975380.4A CN107657902B (en) | 2017-10-16 | 2017-10-16 | Integrated vehicle-mounted bidirectional L ED electronic display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710975380.4A CN107657902B (en) | 2017-10-16 | 2017-10-16 | Integrated vehicle-mounted bidirectional L ED electronic display |
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| Publication Number | Publication Date |
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| CN107657902A CN107657902A (en) | 2018-02-02 |
| CN107657902B true CN107657902B (en) | 2020-07-28 |
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| CN201710975380.4A Active CN107657902B (en) | 2017-10-16 | 2017-10-16 | Integrated vehicle-mounted bidirectional L ED electronic display |
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| CN109872646B (en) * | 2019-03-29 | 2021-08-20 | 凯扬光电(苏州)有限公司 | Graphene display screen capable of dissipating heat quickly |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102112906A (en) * | 2008-05-27 | 2011-06-29 | 深圳市新超亮特种显示设备有限公司 | LCD apparatus with heat dissipation arrangements |
| CN204595396U (en) * | 2015-05-18 | 2015-08-26 | 上海启钧电子有限公司 | Integration double-sided display modular structure |
| CN105717706A (en) * | 2016-04-28 | 2016-06-29 | 青岛海信电器股份有限公司 | Double-sided backlight source and double-sided display device |
| CN205942195U (en) * | 2016-07-12 | 2017-02-08 | 深圳市帝晶光电科技有限公司 | Two -sided display module assembly structure of integration |
-
2017
- 2017-10-16 CN CN201710975380.4A patent/CN107657902B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102112906A (en) * | 2008-05-27 | 2011-06-29 | 深圳市新超亮特种显示设备有限公司 | LCD apparatus with heat dissipation arrangements |
| CN204595396U (en) * | 2015-05-18 | 2015-08-26 | 上海启钧电子有限公司 | Integration double-sided display modular structure |
| CN105717706A (en) * | 2016-04-28 | 2016-06-29 | 青岛海信电器股份有限公司 | Double-sided backlight source and double-sided display device |
| CN205942195U (en) * | 2016-07-12 | 2017-02-08 | 深圳市帝晶光电科技有限公司 | Two -sided display module assembly structure of integration |
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| CN107657902A (en) | 2018-02-02 |
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Effective date of registration: 20240204 Address after: 474150, Dengzhou City, Henan Province, 800 meters south of the intersection of South Second Ring Road and Ping'an Avenue, Dengzhou City, Dengzhou City, Dengzhou City, Dengzhou City, Dengzhou City Industrial Cluster Zone, Building 10, Building 11 Patentee after: Henan Jinfeng Electronics Co.,Ltd. Country or region after: China Address before: 530012 room 705, unit 3, building 2, No.1 Renmin East Road, Xingning District, Nanning City, Guangxi Zhuang Autonomous Region Patentee before: GUANGXI NANNING YINGFANDA TECHNOLOGY CO.,LTD. Country or region before: China |