CN103500542A - Led lamp panel - Google Patents
Led lamp panel Download PDFInfo
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- CN103500542A CN103500542A CN201310446042.3A CN201310446042A CN103500542A CN 103500542 A CN103500542 A CN 103500542A CN 201310446042 A CN201310446042 A CN 201310446042A CN 103500542 A CN103500542 A CN 103500542A
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Abstract
The invention relates to an LED lamp panel which comprises a plurality of LEDs, a first input and outlet port, an LED drive circuit and a data postback circuit. The LED drive circuit is electrically connected to the first input and outlet port, and used for receiving external data and control signals from the first input and outlet port to drive and control the LEDs and generate postback data representing the detection result of the LED lamp panel. The data postback circuit is electrically connected to the first input and outlet port and used for transmitting the postback data to the first input and outlet port. The data postback circuit is formed on the LED lamp panel, so that failure detection on all LED lamp panels of an LED display screen can be achieved without arranging an extra monitoring board to set up a loop, wire connection can be simplified, and low cost is achieved.
Description
Technical field
The present invention relates to the display technique field, particularly a kind of LED lamp plate.
Background technology
LED (Light emitting diode, light emitting diode) display screen system is as novel display technique, with its energy-saving and environmental protection, the advantage such as highlighted, accepted by market gradually, thereby is widely used in the fields such as city medium, urban transportation.
Wherein, field of traffic LED display system generally can be used for showing the information such as road name, traffic, speed limit, each LED on LED display likely breaks down, when LED number of faults and position acquire a certain degree, can affect the demonstration of information, can mistake in communication information when serious.Therefore, the fault detect that how to make field of traffic LED display system can carry out in time LED is one of current problem demanding prompt solution.
Realize in the loop that the LED fault detect of existing a kind of LED display system needs receiving card, LED lamp plate and monitor board to form, but concrete REFERENCE TO RELATED people is the application for a patent for invention that CN201210210656.7, denomination of invention are " a kind of LED display condition checkout gear and detection method " at the application number of application on June 25th, 2012.Receiving card output data and control signal are to the LED lamp plate, the LED lamp plate has input port and delivery outlet, data-signal is delivered to follow-up LED lamp plate, the delivery outlet of most end one-level LED lamp plate is connected to monitor board, monitor board receives also and is sent to receiving card after process data signal, and the data that receiving card is received by analysis can be obtained the LED failure condition of LED display.
Yet prior art has the following disadvantages: the casing connection wire at (1) LED lamp plate place is too much, more complicated; (2) need the additional configuration monitor board, cost is higher.Therefore, be necessary to propose the simple and lower-cost LED fault detect mode of a kind of line.
Summary of the invention
Therefore, the invention provides a kind of LED lamp plate, it can realize the simple and lower-cost LED fault detect of line.
Particularly, a kind of LED lamp plate that the embodiment of the present invention provides, it comprises: a plurality of LED, the first input and output interface, LED drive circuit and data feedback circuit.Wherein LED drive circuit is electrically connected to the first input and output interface, for receive outside data and control signal from the first input and output interface, drives and controls the passback data that described a plurality of LED and generation represent the testing result of described LED lamp plate.The data feedback circuit is electrically connected to the first input and output interface, for transmitting the input of described passback data to the first and output interface.
In addition, a kind of LED lamp plate that another embodiment of the present invention provides comprises: a plurality of LED, data generation pass section and data passback route segment.Wherein, data generation pass section drives the described a plurality of LED of control and generation to represent the passback data of the testing result of described LED lamp plate for the control of accepting the outside data of inputting and control signal.Data passback route segment is for transmitting described passback data.
The present invention is by forming the data feedback circuit on the LED lamp plate, therefore without monitor board additionally is set, builds loop and can complete the fault detect to each LED lamp plate of LED display, so can simplify line, and have lower cost.
By the detailed description below with reference to accompanying drawing, it is obvious that other side of the present invention and feature become.But it should be known that the only purpose design for explaining of this accompanying drawing, rather than, as the restriction of scope of the present invention, this is because it should be with reference to additional claim.Should also be appreciated that, unless otherwise noted, the unnecessary accompanying drawing of drawing to scale, they only try hard to illustrate conceptually structure described herein and flow process.
The accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
The configuration diagram of a kind of LED display system that Fig. 1 is the embodiment of the present invention.
A kind of circuit block diagram that Fig. 2 is LED display control card shown in Fig. 1.
A kind of circuit block diagram that Fig. 3 is each LED lamp plate shown in Fig. 1.
A kind of circuit block diagram that Fig. 4 is end termination module shown in Fig. 1.
The circuit block diagram that Fig. 5 is the another kind of embodiment of most end one-level LED lamp plate in the string of LED lamp plate shown in Fig. 1.
The configuration diagram of the LED display system that Fig. 6 is another embodiment of the present invention.
Another angle configuration diagram that Fig. 7 is LED display system shown in Fig. 1.
The configuration diagram of the LED display system that Fig. 8 is yet another embodiment of the invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
The configuration diagram of a kind of LED display system that Fig. 1 is the embodiment of the present invention.As shown in Figure 1, LED display system 10 comprises LED display control card 11, a plurality of LED lamp plate string 13 and a plurality of end termination module 17.Wherein, single led lamp plate string 13 for example comprises two LED lamp plate 15a, 15b and is cascaded to LED display control card 11, and an end termination module 17 of each LED lamp plate string 13 configuration.It should be noted that, LED lamp plate 15a, 15b can have identical circuit structure, the difference of label be mainly for mean its in LED lamp plate string 13 in different positions; In addition, the quantity of LED lamp plate string 13 is not limited to two shown in Fig. 1, need be depending on the size of actual LED display of building; The quantity of LED lamp plate 15a, 15b in single led lamp plate string 13 also is not limited to two shown in Fig. 1, can be also one, is for example only LED lamp plate 15b, or, more than two, for example comprises a plurality of LED lamp plate 15a and a LED lamp plate 15b; In addition, end termination module 17 can be the circuit module that is independent of LED lamp plate 15b, also to be formed directly on most end one-level LED lamp plate 15b.It should be noted that, for the situation of the LED lamp plate string only consisted of a LED lamp plate, most end one-level LED lamp plate and first order LED lamp plate are same lamp plate.
Please in the lump with reference to figure 1 and Fig. 2, a kind of circuit block diagram that Fig. 2 is LED display control card 11 shown in Fig. 1.In Fig. 2, LED display control card 11 mainly comprises governor circuit 110, output circuit 112, data feedback circuit 114 and input and output interface 113; Certainly LED display control card 11 can also comprise some necessary auxiliary circuits for example volatile memory and/or nonvolatile memory, does not repeat them here.In addition, LED display control card 11 is for example a minute two-tier circuit plate design, and governor circuit 110 is arranged on the bottom circuit board, and output circuit 112, data feedback circuit 114 and input and output interface 113 are arranged on layer circuit board; At this, upper layer circuit board is mainly as the use of Interface Expanding, and it can be fixed to the bottom circuit board by row pin/mother row.
Hold above-mentioned, governor circuit 110 for example comprises programming device, picture FPGA (Field Programmable Gate Array, field programmable gate array), CPLD (Complex Programmable Logic Device, CPLD) device such as, it can carry out data-switching and gray-scale Control shows by data and controls signal to output circuit 112 to provide, then is sent to each LED lamp plate 15a, 15b by output circuit 112 by input and output interface 113; Herein, the demonstration that LED lamp plate 15b receives is passed on and come by the previous stage LED lamp plate 15a with its cascade by data and control signal.Be understandable that, the programming device in governor circuit 110 is the embedded microprocessor such as replaceable one-tenth ARM, MCU (Microcontroller Unit) also; Or, governor circuit 110 comprises programming device and embeds the combination that declines and process, so embedded microprocessor can be responsible for displaying contents is resolved to form displays content data and the control signals such as clock, synchronizing signal for programming device, and programming device is responsible for data-switching and gray-scale Control shows by data and control signal to provide to LED lamp plate 15a, 15b.Output circuit 112 is connected electrically between governor circuit 110 and input and output interface 113, and it is such as exporting the data such as data-signal, enable signal, data latch signal, shift clock and control signal to input and output interface 113 for demonstration such as R (red), G (green), B (indigo plant).Data feedback circuit 114 is connected electrically between governor circuit 110 and input and output interface 113, and the passback data that its reception transmission are inputted from input and output interface 113 are to governor circuit 110.At this, data feedback circuit 114 is such as being driving chip (such as chips such as 74HC245) or the discrete component circuit strengthened for signal, or is connecting line.In addition, description by above-mentioned LED display control card 11 can be learnt: input can be distinguished output data-interface, control signal interface and three parts of passback data-interface with output interface 113, wherein, the output data-interface as the delivery outlet of data-signal for demonstration such as R, G, B, return the input port of data-interface as the passback data-signal of the spot check result that represents R, G, B three-color LED.Be understandable that, data-signal is that R, G, B tri-looks show to be corresponding to being provided with R, G, B three-color LED on LED lamp plate 15a, 15b by the situation of data-signal, but the present invention is not as limit, also R, G dual-colored LED can only be set on LED lamp plate 15a, 15b, can also be perhaps to be provided with four look LED, or be that monochromatic LED only is set.
A kind of circuit block diagram that Fig. 3 is the 15a of LED lamp plate shown in Fig. 1 (15b).In Fig. 3, LED lamp plate 15a (15b), except comprising a plurality of LED (not drawing in Fig. 3), also comprises: input and output interface J1, LED drive circuit 151, input and output interface J3 and data feedback circuit 153.Wherein, LED drive circuit 151 is electrically connected between input and output interface J1 and input and output interface J3, whether it for according to from input and control signal and the one's own demonstration of output interface J1 input, with data-signal, driving a plurality of LED that control LED lamp plate 15a (15b) to light, and not one's own demonstration transfers to the next stage LED lamp plate with its cascade by input and output interface J3 with data-signal.In the present embodiment, LED drive circuit 151 is supported the fault detect pattern, is for example to comprise the LED that supports spot check to drive chip, as LED such as MBI5036, MBI5034, MBI5040, DM13H, MBI5030, drives chip.At this, when LED display control card 11 enables LED drive circuit 151, a plurality of LED of its control that drives are carried out to spot check, be also that LED drive circuit 151 is while being operated in the fault detect pattern, LED drive circuit 151 demonstration for spot check provided from LED display control card 11 is provided and by data, drives and control each LED that its band carries, and output represents the passback data of the fault detect result of each LED; Whether the follow-up LED display control card 11 that will be sent to of these passback data exists the position of LED bad point and location LED bad point for analysis this LED lamp plate 15a (15b).
Hold above-mentionedly, data feedback circuit 153 is electrically connected between input and output interface J1 and input and output interface J3, for being sent to and inputting and output interface J1 from the passback data of input and output interface J3 input.At this, data feedback circuit 153 is such as being driving chip (such as chips such as 74HC245) or the discrete component circuit strengthened for signal, or is connecting line.In addition, from the above-mentioned description to LED lamp plate 15a (15b), input can be distinguished input data-interface, control signal interface and three parts of passback data-interface with output interface J1, and input can be distinguished output data-interface, control signal interface and three parts of passback data-interface with output interface J3; And, input and input data-interface, LED drive circuit 151 and the input of output interface J1 and the output data-interface composition data generation pass section of output interface J3; Input and passback data-interface, data feedback circuit 153 and the input of output interface J3 and the passback data-interface composition data passback route segment of output interface J1; Can produce and export the passback data of the fault detect result that represents upper each LED of LED lamp plate 15a (15b) thereby data generation pass section is accepted the control of LED display control card 11, these passback data are follow-up can be returned route segment via data and be sent to LED display control card 11 for analyzing the position that judges whether this LED lamp plate 15a (15b) exists the LED bad point and locate the LED bad point.
A kind of circuit block diagram that Fig. 4 is the end termination circuit 17 shown in Fig. 1.In Fig. 4, end termination circuit 17 comprises input and output interface 170 and data feedback circuit 172.Wherein, data feedback circuit 172 is electrically connected to input and output interface 170, and its reception also is resent to the passback data that receive and inputs with output interface 170 as output from input and the passback data of the testing result that represents the LED in each LED pixel each LED lamp plate 15a, 15b of output interface 170 inputs; Therefore, input can be distinguished input data-interface and output data-interface with output interface 170.Data feedback circuit 172 is such as being driving chip (such as chips such as 74HC245) or the discrete component circuit strengthened for signal, or is connecting line.
Known in conjunction with Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the input of LED lamp plate 15a and output interface J1 can be connected to by winding displacement input and the output interface 113 of LED display control card 11, the input of LED lamp plate 15b and output interface J1 can be connected to by winding displacement input and the output interface J3 of LED lamp plate 15a, and the input of end termination module 17 is connected to the input of LED lamp plate 15b with output interface J3 or by row's pin/row mother coordinates and input and the output interface J3 of LED lamp plate 15b snap together by winding displacement with output interface 170.
Please in the lump referring to Fig. 7 and Fig. 1 and Fig. 2, from another angle, the single led lamp plate string 13 formed by two LED lamp plate 15a, 15b shown in Fig. 1, data generation pass section on LED lamp plate 15a, 15b is serially connected and forms a data generation pass, and the data passback data segment on it is serially connected and forms a data passback path.At this, the data generation pass section on same LED lamp plate and data passback route segment are formed on same circuit board, and are provided with a plurality of LED on this circuit board.This data generation pass is connected with output interface 113 with the input of LED display control card 11 respectively with data passback path, and link together by end termination module 17, so that the passback data of the testing result that represents each LED lamp plate 15a, upper each LED of 15b that the data generation pass produces can sequentially be sent to LED display control card 11 by end termination module 17 and data passback path, for analyzing, judge whether LED lamp plate 15a, 15b exist the position of LED bad point and location LED bad point.
It is worth mentioning that, be relevant in the embodiment shown in Fig. 3 and Fig. 4, end termination module 17 is to be independent of LED lamp plate 15a (15b) and to arrange, but it also can be formed directly into most end one-level LED lamp plate, for example 15b is upper, for example the circuit block diagram of the LED lamp plate 15b shown in Fig. 5.Particularly, the LED lamp plate 15b part that the LED lamp plate 15b in Fig. 5 is different from Fig. 3 is: input and output interface J3 are not set, but are provided with end termination module 17.The LED lamp plate 15b in Fig. 5 and incomplete same with the circuit structure of the prime LED lamp plate 15a of its cascade so.More specifically, in Fig. 5, LED lamp plate 15b comprises input and output interface J1, LED drive circuit 151, data feedback circuit 153 and end termination module 17.Wherein, LED drive circuit 151 is electrically connected between input and output interface J1 and end termination module 17, and whether it drives each LED that controls a plurality of LED pixels LED lamp plate 15b to light for the control signal according to from input and output interface J1 input and one's own demonstration by data.LED drive circuit 151 is supported spot check, when LED display control card 11 enables LED drive circuit 151 when each LED in the LED pixel of its control that drives is carried out to spot check, LED drive circuit 151 demonstration for spot check provided from LED display control card 11 is provided and by data, drives and control each LED, and the passback data of testing result that output represents each LED are to end termination module 17, then transfer to data feedback circuit 153 by end termination module 17; To return data by data feedback circuit 153 and be sent to LED display control card 11 for analyzing the position that judges whether LED lamp plate 15b exists the LED bad point and locate the LED bad point by input with output interface J1.In addition, for end termination module 17, it can be without the input and the output interface 170 that arrange as shown in Figure 4, and can directly with LED drive circuit 151, with data feedback circuit 153, be connected respectively by data feedback circuit 172; At this, data feedback circuit 172 can be driving chip (such as chips such as 74HC245) or the discrete component circuit strengthened for signal, or is connecting line.
It is worth mentioning that, LED lamp plate 15a, 15b are not limited to aforesaid support spot check, can also support that winding displacement detects, LED drives the fault detects such as chip failure detection.
In addition, in other embodiments, as shown in Figure 6, the LED display system 10' of the embodiment of the present invention can comprise a plurality of LED display control cards, two LED display control card 11a, 11b only are shown as an example in Fig. 6, and LED display control card 11a, 11b can have and the control card of LED display shown in Fig. 2 11 essentially identical Circnit Layouts.These LED display control cards 11a, 11b are respectively arranged with communication interface, gigabit network interface for example, these LED display control cards 11a, 11b are linked togather by the communication interface level, so that the required demonstration of rear one-level LED display control card 11b is in previous stage LED display control card 11a by data and control signal then comes.In the present embodiment, displays content data and the control signals such as clock, synchronizing signal that provide from front controller 20 can be provided communication interface, and the passback data that each LED lamp plate string 13 that affiliated LED display control card 11a, 11b band is carried provides are sent to front controller 20 after treatment.At this, the displays content data that front controller 20 provides is for example for driving the LED display be spliced by each LED lamp plate string 13 to show text, picture, clock etc.In addition, each LED display control card 11a, 11b in the system of LED display shown in Fig. 6 10' are not limited to have identical Circnit Layout, also can have different Circnit Layouts, for example, shown in Fig. 8.
Particularly, in Fig. 8, LED display system 10 " comprise LED display control card 11c and LED display control card 11b and LED display control card 11c, 11b with a plurality of LED lamp plate strings 13 that carry.Wherein, the Circnit Layout of LED display control card 11c is different from LED display control card 11b, and it is integrated with the function of the front controller 20 shown in Fig. 6 and LED display control card 11a.Like this, LED display control card 11c is equivalent to a kind of asynchronous control card, its can be resolved the displaying contents imported by its network interface, serial ports or USB mouth from host computer 30 generation displays content data and necessary control signal, carry out again afterwards data-switching and gray-scale Control with output display with data and control signal drive control with year LED lamp plate string 13.In addition, LED display control card 11c can also both directly be with and carry LED lamp plate string 13, can carry other LED lamp plate strings 13 of LED display by the one or more LED display control card of cascade 11b band again.
In sum, the embodiment of the present invention by forming the data feedback circuit on the LED lamp plate, therefore build loop and can complete the fault detect to each LED lamp plate of LED display without monitor board additionally is set, so can simplify line, and there is lower cost.In addition, the LED display system of the embodiment of the present invention can be applied to field of traffic, but the present invention is not as limit.
Applied specific case herein principle and the embodiment of LED lamp plate of the present invention and applied LED display system thereof are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention; all will change in specific embodiments and applications; in sum, this description should not be construed as limitation of the present invention, and protection scope of the present invention should be as the criterion with appended claim.
Claims (10)
1. a LED lamp plate, is characterized in that, comprising:
A plurality of LED;
The first input and output interface;
LED drive circuit, be electrically connected to described the first input and output interface, for receive outside data and control signal from described the first input and output interface, drive and control the passback data that described a plurality of LED and generation represent the testing result of described LED lamp plate; And
The data feedback circuit, be electrically connected to described the first input and output interface, for transmitting described passback data to described the first input and output interface.
2. LED lamp plate as claimed in claim 1, it is characterized in that, further comprise the second input and output interface, described LED drive circuit is connected electrically between described the first input and output interface and described the second input and output interface, and described data feedback circuit is connected electrically between described the first input and output interface and described the second input and output interface; Thereby the passback data that described LED drive circuit produces export described the second input and output interface to, and described passback data also are sent to described data passback path by described the second input and output interface.
3. LED lamp plate as claimed in claim 1, it is characterized in that, further comprise the end termination module, described end termination module connects described LED drive circuit and described data feedback circuit, for the passback data that described LED drive circuit is produced, is sent to described data feedback circuit.
4. LED lamp plate as claimed in claim 3, is characterized in that, described end termination module comprises driving chip or the discrete component circuit strengthened for signal, or described end termination module is connecting line.
5. LED lamp plate as claimed in claim 1, is characterized in that, described LED drive circuit comprises that the LED that supports spot check drives chip.
6. LED lamp plate as claimed in claim 1, is characterized in that, described data feedback circuit comprises driving chip or the discrete component circuit strengthened for signal.
7. LED lamp plate as claimed in claim 1, is characterized in that, described data feedback circuit is connecting line.
8. a LED lamp plate, is characterized in that, comprising:
A plurality of LED;
Data generation pass section, drive the described a plurality of LED of control and generation to represent the passback data of the testing result of described LED lamp plate for the control of accepting the outside data of inputting and control signal; And
Data passback route segment, for transmitting described passback data.
9. LED lamp plate as claimed in claim 8, it is characterized in that, also comprise the end termination module, described end termination module connects described data generation pass section and described data passback route segment, with the passback data that described data generation pass section is produced, is sent to described data passback route segment.
10. LED lamp plate as claimed in claim 8, is characterized in that, is provided with the LED that supports spot check on described data generation pass section and drives chip, on described data passback route segment, is provided with driving chip or the discrete component circuit strengthened for signal.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310446042.3A CN103500542B (en) | 2013-09-26 | 2013-09-26 | Led lamp panel |
| EP14802801.2A EP2879125A4 (en) | 2013-09-26 | 2014-03-10 | Led lamp panel, control card of led display screen, and led display screen system |
| US14/414,881 US9953552B2 (en) | 2013-09-26 | 2014-03-10 | LED display unit board, LED display screen control card and LED display screen system |
| PCT/CN2014/073102 WO2015043139A1 (en) | 2013-09-26 | 2014-03-10 | Led lamp panel, control card of led display screen, and led display screen system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310446042.3A CN103500542B (en) | 2013-09-26 | 2013-09-26 | Led lamp panel |
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| CN103500542A true CN103500542A (en) | 2014-01-08 |
| CN103500542B CN103500542B (en) | 2015-08-12 |
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| CN201310446042.3A Active CN103500542B (en) | 2013-09-26 | 2013-09-26 | Led lamp panel |
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| CN103985357A (en) * | 2014-05-27 | 2014-08-13 | 西安诺瓦电子科技有限公司 | LED lamp panel, tail end terminating module, LED control card and LED display system |
| WO2015043139A1 (en) * | 2013-09-26 | 2015-04-02 | 西安诺瓦电子科技有限公司 | Led lamp panel, control card of led display screen, and led display screen system |
| CN104778911A (en) * | 2015-04-22 | 2015-07-15 | 西安诺瓦电子科技有限公司 | Point inspection method of LED sign board as well as LED display control card |
| CN104795025A (en) * | 2015-04-29 | 2015-07-22 | 西安诺瓦电子科技有限公司 | LED display module and method for detecting states thereof |
| CN105304045A (en) * | 2015-11-17 | 2016-02-03 | 西安诺瓦电子科技有限公司 | Scanning card |
| CN105446236A (en) * | 2016-01-05 | 2016-03-30 | 西安诺瓦电子科技有限公司 | Oil price board control card and oil price board system |
| CN105609083A (en) * | 2015-12-31 | 2016-05-25 | 西安诺瓦电子科技有限公司 | Display control method for oil price plate system |
| CN105788521A (en) * | 2014-12-25 | 2016-07-20 | 西安诺瓦电子科技有限公司 | LED display screen system and state detection method |
| CN105788513A (en) * | 2014-12-22 | 2016-07-20 | 西安诺瓦电子科技有限公司 | Scanning card and LED display screen display control system |
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| CN104778911A (en) * | 2015-04-22 | 2015-07-15 | 西安诺瓦电子科技有限公司 | Point inspection method of LED sign board as well as LED display control card |
| CN104795025A (en) * | 2015-04-29 | 2015-07-22 | 西安诺瓦电子科技有限公司 | LED display module and method for detecting states thereof |
| CN105304045A (en) * | 2015-11-17 | 2016-02-03 | 西安诺瓦电子科技有限公司 | Scanning card |
| CN105609083A (en) * | 2015-12-31 | 2016-05-25 | 西安诺瓦电子科技有限公司 | Display control method for oil price plate system |
| CN105609083B (en) * | 2015-12-31 | 2018-04-06 | 西安诺瓦电子科技有限公司 | A kind of display control method of oil price board system |
| CN105446236A (en) * | 2016-01-05 | 2016-03-30 | 西安诺瓦电子科技有限公司 | Oil price board control card and oil price board system |
| CN105446236B (en) * | 2016-01-05 | 2018-07-20 | 西安诺瓦电子科技有限公司 | Oil price board control card and oil price board system |
| CN110085115A (en) * | 2018-01-26 | 2019-08-02 | 苏州宝时得电动工具有限公司 | Showing stand and showing stand system |
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