CN210199719U - Touch system of large-size touch screen - Google Patents
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- CN210199719U CN210199719U CN201920803679.6U CN201920803679U CN210199719U CN 210199719 U CN210199719 U CN 210199719U CN 201920803679 U CN201920803679 U CN 201920803679U CN 210199719 U CN210199719 U CN 210199719U
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Abstract
The utility model provides a touch system of a large-size touch screen, which comprises a touch screen, a touch chip and at least one multi-way selection switch; the touch screen comprises an electrode layer used for calculating touch coordinates, and the electrode layer comprises a plurality of conductive channels used for transmitting or receiving signals; the multi-way selection switch comprises a plurality of functional pins, a first pin and a plurality of second pins; the touch control chip is connected with the functional pins to control the conduction of the multi-way selection switch; the first pin is electrically connected with the touch control chip, the second pin is electrically connected with the conductive channel, and the touch control chip collects the induction quantity of the conductive channel in real time through the at least one multi-way selection switch. According to the utility model provides a touch-control system of jumbo size touch-sensitive screen, it is through adopting the multiple-way selector switch, can realize the touch-control of jumbo size touch-sensitive screen well, saves the cost.
Description
Technical Field
The utility model belongs to the technical field of the touch-sensitive screen, especially, relate to a touch-control system of jumbo size touch-sensitive screen.
Background
Touch screens are computer peripherals that provide a human-computer interface between an electronic system and a user, and are widely used in many fields. Generally, conductive channels (e.g., driving channels and sensing channels) made of conductive materials are disposed in the touch screen. Touch detection of a touch screen is generally realized by a touch IC (i.e., a touch chip), and the touch IC can accurately judge the position of a touch point by scanning each conductive channel of the touch screen and performing related calculation, so that touch detection is never realized. In general, the number of channels (the number of driving channels Tx and the number of sensing channels Rx) of touch screens with different sizes may be different.
At present, the market demand for large-size touch screens is increasing, however, the number of channels of large-size touch screens in the industry is large (for example, 68 channels in the X direction and 38 channels in the Y direction), but the commonly used small touch ICs only have 20 × 13 channels, which cannot be applied to large-size touch screens. In contrast, a solution generally adopted in the prior art is to implement channel number matching with a large-size touch screen by developing a touch IC with more channels. However, the multi-channel touch IC has the problems of long development period and severe rise of cost.
Disclosure of Invention
The utility model discloses a solve one of the problem that exists among the prior art at least, provide a touch-control system of jumbo size touch-sensitive screen, it can realize small-size touch-control chip to the control of jumbo size touch-sensitive screen through setting up the multiple selection switch, and its scheme is simple, and the cost is lower.
Therefore, an object of the present invention is to provide a touch system of a large-sized touch screen, which includes a touch screen, a touch chip, and at least one multi-way selector switch; the touch screen comprises an electrode layer used for calculating touch coordinates, and the electrode layer comprises a plurality of conductive channels used for transmitting or receiving signals; the multi-way selection switch comprises a plurality of functional pins, a first pin and a plurality of second pins; the touch control chip is connected with the plurality of functional pins; the first pin is electrically connected with the touch chip, and the second pin is electrically connected with the conductive channel.
In some embodiments of the present invention, the electrode layer is divided into N regions, and the multi-way selector switch includes M second pins, where M is greater than or equal to N; a plurality of conductive channels are distributed in each area, each conductive channel in the I area is respectively connected with the I second pin of each multi-way selection switch, and I is less than or equal to N.
In some embodiments of the present invention, the value range of N is 2 to 10.
In some embodiments of the present invention, the multiplexer switch includes two functional pins and four second pins.
In some embodiments of the present invention, the multiplexer and the touch chip are integrated into a whole.
In some embodiments of the invention, the multiplexer switch is CD4051, CD4052, AD7501, or AD 7502.
In some embodiments of the present invention, the conductive channel includes a plurality of sensing channels and a plurality of driving channels, the plurality of driving channels are arranged along a first direction, the plurality of sensing channels are arranged along a second direction, the first direction is perpendicular to the second direction, and the plurality of driving channels are respectively connected to the pins of the touch chip.
In some embodiments of the present invention, the driving channel layer is divided into n regions, and a plurality of driving channels are distributed in each region; the multi-way selection switch comprises m second pins, wherein m is larger than or equal to n, each driving channel in the ith area is respectively connected with the ith second pin of each multi-way selection switch, and i is smaller than or equal to n.
According to the utility model provides a touch-control system of jumbo size touch-sensitive screen, it passes through the multiple choice switch, can expand the passageway of touch-control chip, and a passageway of touch-control chip can communicate with a plurality of passageways of touch-sensitive screen after passing through multiple choice switch's extension, can realize small-size touch-sensitive chip like this to the control of jumbo size touch-sensitive screen, and its scheme is simple, and the cost is lower.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a touch system of a large-size touch screen according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a multi-way selection switch of a touch system of a large-size touch screen according to an embodiment of the present invention;
fig. 3 is a schematic view illustrating a scanning principle of a touch system of a large-size touch screen according to an embodiment of the present invention; and
fig. 4 is a schematic view of an integrated structure of a multi-way selector switch and a touch chip of a touch system of a large-size touch screen according to an embodiment of the present invention.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to further explain the present invention in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1-2, one embodiment of the present invention provides a touch system of a large-sized touch screen, which includes a touch screen 10, a touch chip 12, and at least one multi-way selector switch 14; the touch screen 10 comprises a sensing electrode layer 11, wherein the sensing electrode layer 11 comprises a plurality of conductive channels 101; as shown in fig. 2, the multiplexer 14 includes a plurality of functional pins 141, a first pin 142, and a plurality of second pins 143; the touch chip 12 is connected to the plurality of functional pins 141 to control the conduction of the multi-way selection switch 14; the first pin 142 is electrically connected to the touch chip 12, the second pin 143 is electrically connected to the conductive channel 101, and the touch chip 12 collects the sensing amount of the conductive channel 101 in real time through the at least one multi-way selector switch 14.
In this embodiment, the first pin 142 is an input pin and the second pin 143 is an output pin. However, the pins of the multi-way selector switch are mostly of an IO input output bi-directional type, and can be used as both input and output pins. Multichannel selector switch (also someone is called the multiplexer, and someone is called the switch tube in addition), it can be according to actual need with arbitrary way select wherein to realize switching on of a certain way, its specific control principle is known for technical personnel in the field, the utility model discloses no longer describe repeatedly this.
It is understood that the present invention is not limited to the specific type of the multi-way selector switch, and the multi-way selector switch 14 can be a switch type that can be expanded according to the actual requirement, for example, in some embodiments of the present invention, the multi-way selector switch is CD4051, CD4052, AD7501 or AD 7502.
In some embodiments of the present invention, the multiplexing switch 14 includes two functional pins 141 and four second pins 143. That is, in this embodiment, the multiplexing switch 14 can realize a 4-fold expansion of the electrode pins of the touch chip.
Referring to fig. 2, the two functional pins a0 and a1 of the multi-way selector switch 14 in this embodiment are connected to the touch chip 12 through signal lines, and the touch chip 12 can control one of the first pin Y and the 4 second pins (S1, S2, S3, S4) of the multi-way selector switch 14 to be turned on according to the binary signal in the following table.
| A0 | A1 | Y communicating end |
| 0 | 0 | S1 |
| 0 | 1 | S2 |
| 1 | 0 | S3 |
| 1 | 1 | S4 |
That is, in this embodiment, the multi-way select switch 14 is equivalent to a single-pole four-contact switch, and the signal of the two functional pins a0 and a1 can control the first pin Y to which the second pin is connected, so as to realize fast switching between the 4-way signals of S1 to S4, and since one pin of the touch chip is connected to the first pin 142 (i.e., the first pin Y) of the multi-way select switch 14 and the second pin 143 of the multi-way select switch 14 is connected to the conductive channel, the pin extension of the touch chip can be realized.
Of course, for the multi-way selection switch 14 of the present embodiment, it can implement 4 times expansion of the pins of the touch chip at most, and according to the actual situation, it can also implement only 3 times expansion, for example, only the control signals of the functional pins a0 and a1 need to be the cyclic signals of 00-01-10, and when the control signal is 00, Y is communicated with S1; when the control signal is 01, Y is communicated with S2; when the control signal is 10, Y communicates with S3.
To the extension of higher multiple, for example 8 times extension, multiplexer switch 14 can set up three function pin to and eight second pins, and then, equally according to binary control signal, can realize 8 times extensions through three pin, and its concrete control principle is similar with 4 times extensions, the utility model discloses it is not repeated here.
Furthermore, in the touch system of the large-size touch screen provided by the present invention, the electrode pin of the touch chip 12 can be extended through the multi-way selection switch 14, that is, one electrode pin of the touch chip 12 can be connected to the plurality of conductive channels 101 through the plurality of second pins 143 of the multi-way selection switch 14.
For example, when a touch screen actually has 36 conductive channels and a touch chip has 13 channels, the touch screen can be expanded by 3 and 4-time multi-channel selection switches, so that the expansion of 13 channels of the touch chip into 42 channels can be realized, and the requirement of the touch screen can be easily met.
It is understood that the present invention is not limited to the specific sensing data temporary storage and synthesis method, and it can be determined according to the connection manner of the second pin 143 of the specific multiplexer 14 and the conductive channel.
Furthermore, the utility model discloses a multiplexer 14 can realize that the electrode pin of touch-control chip 12 expands for the less touch-control chip 12 of electrode pin quantity can satisfy the demand of the touch-sensitive screen including the electrically conductive passageway of a large number, for example, under the condition of 3 times extension, the touch-control chip that has 13 electrode pins can realize the touch-control to the touch-sensitive screen that has 39 electrically conductive passageways.
Of course, it can be understood that the present invention is not only applicable to the number expansion of the sensing channels, but also applicable to the number expansion of the driving channels. That is, the electrode layer for calculating touch coordinates may include a sensing channel layer, and may also include a driving channel layer; the conductive paths for transmitting or receiving signals include sensing paths and driving paths. It is to be understood that, for the specific calculation method and principle of the touch coordinate of the touch screen, the calculation method and principle known to those skilled in the art can be adopted, and the present invention is not particularly limited thereto.
Taking the number expansion of the sensing channels as an example, in some embodiments of the present invention, the electrode layer 11 is a sensing electrode layer, which is divided into N regions, and the multi-way selection switch 14 includes M second pins 143, where M is greater than or equal to N; a plurality of sensing channels 101 are distributed in each area, each sensing channel 101 in the I-th area is respectively connected with the I-th second pin 143 of each multi-way selection switch 14, and I is less than or equal to N.
That is, in this embodiment, the sensing electrode layer 11 is divided into a plurality of regions, and referring to fig. 1, taking 3 regions as an example, the first region a, the second region B and the third region C are respectively, a plurality of sensing channels 101 are provided in each region, for example, 13 sensing channels 101, RX1 and RX2 … … RX13 are provided in each region, meanwhile, the touch system of the large-size touch screen provided in this embodiment includes 13 multi-way selection switches 14, the multi-way selection switch 14 includes 4 second pins 143 (that is, in this embodiment, the pins of the touch chip can be extended at most 4 times), and each sensing channel 101 in the first region a is connected to the 1 st second pin 143 of each multi-way selection switch 14.
That is, RX1 in the first region a is connected to the 1 st second pin 143 of the 1 st multiplexer switch 14, RX2 in the first region a is connected to the 1 st second pin 143 of the 2 nd multiplexer switch 14, RX3 in the first region a is connected to the 1 st second pin 143 of the 3 rd multiplexer switch 14, and so on; RX1 in the second region B is connected to the 2 nd second pin 143 of the 1 st multiplexer switch 14, RX2 in the second region B is connected to the 2 nd second pin 143 of the 2 nd multiplexer switch 14, RX3 in the second region B is connected to the 2 nd second pin 143 of the 3 rd multiplexer switch 14, and so on; meanwhile, the RX1 in the third area C is connected to the 3 rd second pin 143 of the 1 st multiplexer 14, the RX2 in the third area C is connected to the 3 rd second pin 143 of the 2 nd multiplexer 14, the RX3 in the third area C is connected to the 3 rd second pin 143 of the 3 rd multiplexer 14, and so on.
At this time, referring to fig. 3, if the control signals of the functional pins a0 and a1 are cyclic signals of 00-01-10, when the control signal is 00, the input terminal Y of each multiplexer 14 is connected to the first and second pins, and further, the scanning of all the sensing channels in the first area a can be completed, and at this time, the scanned data can be temporarily stored (the sensing data in the figure is only an example); when the control signal is 01, the input terminal Y of each multi-way selector switch 14 is connected to the second pin, and then, the scanning of all the sensing channels in the second area B can be completed at this time, and at this time, the scanned data can be temporarily stored (the sensing data in the figure is only an example); when the control signal is 10, the input terminal Y of each multi-way selector switch 14 is connected to the third second pin, and then, the scanning of all the sensing channels in the third area C can be completed at this time, and the data of the three times of scanning is synthesized into one frame, so that the effect formed at this time is the same as the result of the data scanned under the condition of real multi-channel.
It can be understood that the number of the sensing electrode layer regions can be set according to the size of the actual touch screen, for example, in some embodiments of the present invention, the value range of N is 2 to 10. According to regional quantity equally, can confirm to adopt several times the multiple selector switch to suit with it, the utility model discloses it is no longer repeated to this.
Of course, as described above, the same principle as the above embodiments may also be adopted for the expansion of the number of driving channels of the touch screen, and the present invention is not limited to the expansion of the number of sensing channels. For example, in some embodiments of the present invention, the electrode layer further includes a driving channel layer, the driving channel layer includes a plurality of driving channels (not shown in the figure), the plurality of driving channels are arranged along a first direction, the plurality of sensing channels 101 are arranged along a second direction, the first direction and the second direction are perpendicular, and the plurality of driving channels are respectively connected to the pins of the touch chip 12.
It is understood that the shapes and arrangements of the driving channels and the sensing channels can adopt various common shapes and arrangements in the field, and the present invention is not limited thereto.
In some embodiments of the present invention, the driving channel layer is divided into n regions, and a plurality of driving channels are distributed in each region; the multi-way selection switch comprises m second pins, wherein m is larger than or equal to n, each driving channel in the ith area is respectively connected with the ith second pin of each multi-way selection switch, and i is smaller than or equal to n. It can be understood that, in this embodiment, by setting at least one multi-way selection switch, channel expansion of the touch chip can be realized, and control of a large-size touch screen with a larger number of driving channels by a small-size touch chip can be realized.
The connected mode and the theory of operation of drive channel and multiplexer switch are the same with the connected mode and the theory of operation of response channel and multiplexer switch in above-mentioned embodiment, the utility model discloses no longer describe repeatedly this.
It can be understood that the number of the multi-way selection switches can be determined according to the actual number of the sensing channels, the number of the driving channels, and the number of the electrode pins of the touch chip. Meanwhile, in order to further reduce the cost, an integrated multi-way selection switch can be developed and designed, a plurality of channels are integrated together, and the packaging cost can be further reduced. It will be appreciated that for a fixed number of sense channels and drive channels, the higher the scalability multiple of the multiswitch, the fewer the number of multiswitch required, and thus the lower the packaging cost.
Preferably, in some embodiments of the present invention, the multiplexer 14 is integrated with the touch chip 12, that is, a plurality of multiplexers 14 are integrated with the touch chip 12, so as to develop a dedicated chip suitable for large-sized touch screen control, thereby further reducing the cost. Referring to fig. 4, this embodiment is a 16-way 3-fold expansion integrated chip solution, and the functional pins a0 and a1 of the integrated chip are controlled by binary signals, for example, when the control signals of a0 and a1 are 00, Y1 to Y16 are connected to SA1-SA16, when the control signals of a0 and a1 are 01, Y1 to Y16 are connected to SB1-SB16, and when the control signals of a0 and a1 are 10, Y1 to Y16 are connected to SC1-SC 16. It is understood that the plurality of multiplexing switches 14 can be integrated with the touch chip 12 by various methods commonly used in the art, and the present invention is not limited thereto.
Similarly, the function of the multi-way selector switch can also be realized in a circuit manner, that is, the multi-way selector switch module circuit designed to realize multi-way selection is matched with the touch chip to further realize the function of multi-way expansion, and further, in this embodiment, an entity multi-way selector switch (or a multi-way selector) is not required to be selected, so that the cost can be reduced, and the space volume can be reduced.
As is well known, to realize touch sensing and control of a touch screen, each driving channel and each sensing channel of the touch screen needs to be connected to a pin on a touch chip. Taking the touch screen with 24 driving channels and 13 sensing channels as an example, if the length of a single direction (e.g. the length of a transverse direction or a longitudinal direction) of the touch screen is doubled, the number of channels in the direction is also doubled, and if the number N of sensing channels is doubled to 13 and is 26, the total number of channels is increased to 50.
In order to realize that each driving channel and each sensing channel are connected to one pin on the touch chip, a general scheme in the prior art is to develop a touch chip with 50 electrode pins to adapt to a touch screen with 50 channels. However, the package overall dimension of a touch chip with 50 electrode pins in the industry needs to be more than 7 × 7mm, and the wafer cost, the package cost and the physical space occupied on the device are correspondingly increased, so that the development cost of the touch IC is increased, and more physical space is occupied.
And according to the utility model provides a touch-control system of jumbo size touch-sensitive screen, it is through external cheap multiple choice switch 14, can expand the passageway of touch-control chip 12, can communicate with a plurality of passageways of touch-sensitive screen 10 after the passageway of touch-control chip 12 passes through multiple choice switch 14's extension, circulate and switch over through control multiple choice switch circuit, the passageway of multiplexing touch-control chip can realize small-size touch-sensitive chip 12 to the control of jumbo size touch-sensitive screen, its cost is comparatively, and its scheme is simple moreover.
In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A touch system of a large-size touch screen is characterized by comprising the touch screen, a touch chip and at least one multi-way selection switch; the touch screen comprises an electrode layer used for calculating touch coordinates, and the electrode layer comprises a plurality of conductive channels used for transmitting or receiving signals; the multi-way selection switch comprises a plurality of functional pins, a first pin and a plurality of second pins; the touch control chip is connected with the plurality of functional pins; the first pin is electrically connected with the touch chip, and the second pin is electrically connected with the conductive channel.
2. The touch system of a large-size touch screen according to claim 1, wherein the electrode layer is divided into N regions, the multi-way selector switch comprises M second pins, wherein M is greater than or equal to N; a plurality of conductive channels are distributed in each area, each conductive channel in the I area is respectively connected with the I second pin of each multi-way selection switch, and I is less than or equal to N.
3. The touch system of the large-size touch screen according to claim 2, wherein the value of N ranges from 2 to 10.
4. The touch system of claim 2, wherein the multiplexing switch comprises two functional pins and four second pins.
5. The touch system of the large-size touch screen according to claim 1, wherein the multi-way selector switch is integrated with the touch chip; or the multi-way selection switch is a multi-way selection switch module circuit.
6. The touch system of the large-size touch screen according to claim 2, wherein the multi-way selector switch is a CD4051, a CD4052, an AD7501 or an AD 7502.
7. The touch system of claim 2, wherein the conductive channels comprise a plurality of sensing channels and a plurality of driving channels, the plurality of driving channels are arranged along a first direction, the plurality of sensing channels are arranged along a second direction, the first direction and the second direction are perpendicular, and the plurality of driving channels are respectively connected to the pins of the touch chip.
8. The touch system of a large-size touch screen according to claim 7, wherein the driving channels are divided into n regions, and a plurality of driving channels are distributed in each region; the multi-way selection switch comprises m second pins, wherein m is larger than or equal to n, each driving channel in the ith area is respectively connected with the ith second pin of each multi-way selection switch, and i is smaller than or equal to n.
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| CN201920803679.6U CN210199719U (en) | 2019-05-30 | 2019-05-30 | Touch system of large-size touch screen |
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| CN201920803679.6U CN210199719U (en) | 2019-05-30 | 2019-05-30 | Touch system of large-size touch screen |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021197199A1 (en) * | 2020-03-31 | 2021-10-07 | 比亚迪半导体股份有限公司 | Touch key scanning circuit, low power mode exiting method, and device |
| CN113970987A (en) * | 2021-10-18 | 2022-01-25 | 中航华东光电有限公司 | Multi-chip cascaded capacitive touch screen driving system and method |
| WO2022036992A1 (en) * | 2020-08-17 | 2022-02-24 | 安徽鸿程光电有限公司 | Capacitive touch-control module and control method therefor, and related device |
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2019
- 2019-05-30 CN CN201920803679.6U patent/CN210199719U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021197199A1 (en) * | 2020-03-31 | 2021-10-07 | 比亚迪半导体股份有限公司 | Touch key scanning circuit, low power mode exiting method, and device |
| WO2022036992A1 (en) * | 2020-08-17 | 2022-02-24 | 安徽鸿程光电有限公司 | Capacitive touch-control module and control method therefor, and related device |
| CN113970987A (en) * | 2021-10-18 | 2022-01-25 | 中航华东光电有限公司 | Multi-chip cascaded capacitive touch screen driving system and method |
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Address after: Room 701, 7th floor, Smart Valley Innovation Park, 1010 Bulong Road, Minzhi Street, Longhua District, Shenzhen City, Guangdong Province Patentee after: Shenzhen deminli Technology Co.,Ltd. Address before: Room 701, 7th floor, Smart Valley Innovation Park, 1010 Bulong Road, Minzhi Street, Longhua District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN DEMINGLI ELECTRONICS Co.,Ltd. |
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Address after: 518000 2501 and 2401, block a, building 1, Shenzhen new generation industrial park, No. 136, Zhongkang Road, Meidu community, Meilin street, Futian District, Shenzhen, Guangdong Patentee after: Shenzhen deminli Technology Co.,Ltd. Address before: 518000 room 701, 7 / F, smart Valley Innovation Park, 1010 Bulong Road, Minzhi street, Longhua District, Shenzhen, Guangdong Patentee before: Shenzhen deminli Technology Co.,Ltd. |
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Effective date of registration: 20240130 Address after: Room 409, 4th Floor, Building 1, No. 199 Weikang Road, Xiangzhou District, Zhuhai City, Guangdong Province, 519000 Patentee after: Zhuhai Hongpeihan Electronic Technology Co.,Ltd. Country or region after: China Address before: 2501, 2401, block a, building 1, Shenzhen new generation industrial park, 136 Zhongkang Road, Meidu community, Meilin street, Futian District, Shenzhen, Guangdong 518000 Patentee before: Shenzhen deminli Technology Co.,Ltd. Country or region before: China |