WO2018214375A1 - Tablette intelligente à écran tactile capacitif - Google Patents

Tablette intelligente à écran tactile capacitif Download PDF

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Publication number
WO2018214375A1
WO2018214375A1 PCT/CN2017/104954 CN2017104954W WO2018214375A1 WO 2018214375 A1 WO2018214375 A1 WO 2018214375A1 CN 2017104954 W CN2017104954 W CN 2017104954W WO 2018214375 A1 WO2018214375 A1 WO 2018214375A1
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WO
WIPO (PCT)
Prior art keywords
capacitive screen
com
whole machine
interface
isolator
Prior art date
Application number
PCT/CN2017/104954
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English (en)
Chinese (zh)
Inventor
马正
邬营杰
刘天保
陶炳俊
Original Assignee
广州视源电子科技股份有限公司
广州视睿电子科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 广州视源电子科技股份有限公司, 广州视睿电子科技有限公司 filed Critical 广州视源电子科技股份有限公司
Publication of WO2018214375A1 publication Critical patent/WO2018214375A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means

Definitions

  • the utility model relates to the field of smart plates, in particular to a capacitive screen smart tablet.
  • the smart tablet is an integrated device that controls the content displayed on the display tablet through touch technology to realize human-computer interaction.
  • the smart tablet integrates various functions of projector, electronic whiteboard, curtain, audio, TV, video conferencing terminal, and is suitable for group communication occasions. It solves the problem of remote audio and video communication in conferences and high-definition display of conference documents in various formats.
  • Systematic meeting requirements such as video file playback, live audio, screen writing, document labeling, saving, printing and distribution are widely used in education, business meetings, business presentations, etc., which can effectively improve the communication environment and improve group communication efficiency.
  • Infrared Touch Screen Technology consists of a touch screen and infrared transmitting and receiving sensing elements mounted on the outer frame of the touch screen.
  • the infrared emitting and receiving sensing elements form an infrared detecting net on the surface of the screen, and any touch object can change the contact.
  • Touch screen operation is achieved by infrared rays.
  • the capacitive screen works with the current sensing of the human body. The advantage of the infrared touch screen is that it is cheap and free from current, voltage and static interference, and is suitable for harsh environmental conditions.
  • the disadvantage is that the resolution is low, and the thickness of the whole machine is increased due to the increase of the outer frame.
  • the advantage of the capacitive screen is that the writing experience is smooth, the resolution is high, and the whole machine can be made thin, but the disadvantage of the capacitive screen is that it is easily disturbed by the interference of the external environment, resulting in inaccurate touch or inability to touch and write. For example, when the ambient temperature and humidity change, it will cause the capacitive screen to drift, resulting in inaccurate touch.
  • the drift of the capacitive screen is a technically insufficiency.
  • the environmental potential surface including the user's body) is farther away from the capacitive touch screen, but much larger than the finger area.
  • the inventor found in the process of applying a capacitive screen to a smart tablet, especially a large-sized smart tablet, even if the influence of external environmental interference is eliminated, the capacitive screen may still have a jump point or a written interruption, and this phenomenon There are no reasonable explanations for the reasons at present.
  • the utility model found that the main reason for the jump point is that the noise signal of the external power grid and the liquid crystal display panel and the whole machine interfere with the grounding of the whole machine during operation, because the whole machine and the capacitive screen are performed.
  • the grounding of the whole machine and the grounding of the capacitive screen need to be connected, which causes the interference of the grounding of the whole machine to be conducted to the grounding of the capacitive screen, and the capacitive screen needs to be grounded by its own ground. Reference, so when the ground is disturbed, it may cause a change in the reference, resulting in a capacitive screen jump point.
  • the object of the present invention is to provide a capacitive screen smart panel, which can avoid the interference of the grounding of the whole machine to the grounding of the capacitive screen, and solve the jumping point phenomenon of the capacitive screen due to grounding interference.
  • the utility model provides a capacitive screen smart panel, comprising: a whole machine, a capacitive screen, a liquid crystal display panel and a COM isolator, wherein the liquid crystal display panel is disposed between the whole machine and the capacitive screen;
  • the whole machine includes a whole machine backboard, a power supply, a TV main board, a capacitive screen control board and a liquid crystal panel driving board;
  • the power supply is connected to the TV main board;
  • the liquid crystal display driving board is connected to the liquid crystal display panel and the TV main board;
  • the capacitive screen control board is hung on the whole machine back board, and is Capacitive screen connection;
  • the capacitive screen control board has a first COM interface
  • the TV motherboard has a second COM interface
  • the first COM interface and the second COM interface are connected by the COM isolator.
  • the COM isolator has a signal isolation function.
  • the COM isolator has both a power isolation function and a signal isolation function.
  • the first COM interface and the second COM interface are an RS232 interface or an RS422 interface or an RS485 interface.
  • the capacitive screen smart tablet further includes an AD conversion module; the capacitive screen passes through the capacitor The screen receiving line and the capacitive screen output line are connected to the capacitive screen control board, and the AD conversion module is connected to the capacitive screen receiving line.
  • the AD conversion module is disposed at one end of the capacitive screen receiving line connected to the capacitive screen.
  • the capacitive screen receiving line and the capacitive screen output line are routed along an inner wall of the whole machine backplane; wherein the capacitor receiving line and the capacitor output line comprise a conductor layer, and the conductor layer is wrapped a first insulating layer and a shielding layer disposed outside the first insulating layer.
  • the shielding layer is insulated from the inner wall of the whole machine backboard
  • the shielding layer is provided with a second insulating layer surrounding the shielding layer; or
  • An insulating spacer is interposed between the shielding layer and an inner wall of the whole machine backboard;
  • An insulating tape is attached to a portion of the inner wall of the whole machine back plate that is in contact with the shielding layer.
  • a power isolator is further included, and the power source is connected to the capacitive screen control board through the power isolator.
  • the capacitive screen smart tablet provided by the embodiment of the present invention adds a COM isolator between the second COM interface of the TV main board and the first COM interface of the capacitive screen control board, thereby
  • the capacitive screen is grounded and isolated, so that the interference received by the grounding end of the whole machine does not affect the grounding end of the capacitive screen, thereby avoiding the phenomenon that the capacitive screen is bumped due to interference of the grounding end, thereby improving the phenomenon.
  • the operational stability of the capacitive screen is provided by the embodiment of the present invention adds a COM isolator between the second COM interface of the TV main board and the first COM interface of the capacitive screen control board, thereby
  • the capacitive screen is grounded and isolated, so that the interference received by the grounding end of the whole machine does not affect the grounding end of the capacitive screen, thereby avoiding the phenomenon that the capacitive screen is bumped due to interference of the grounding end, thereby improving the phenomenon.
  • FIG. 1 is a schematic structural diagram of a capacitive screen smart tablet according to an embodiment of the present invention.
  • FIG. 2 is a schematic view of a connection of the whole machine provided by the embodiment of the present invention.
  • FIG. 3 is a schematic diagram of the whole machine and the capacitive screen isolated by the COM isolator according to the embodiment of the present invention.
  • FIG. 4 is a schematic diagram of an RS232 interface provided by an embodiment of the present invention.
  • FIG. 5 is a pin definition diagram of the RS232 interface of FIG. 4.
  • Figure 6 is a pin definition diagram of the RS422 interface.
  • Figure 7 is the first pin definition of the RS485 interface.
  • Figure 8 is a second pin definition of the RS485 interface.
  • FIG. 9 is a schematic diagram of a connection between a whole machine and a capacitive screen according to an embodiment of the present invention.
  • FIG. 10 is a schematic cross-sectional view of a capacitive screen receiving line according to an embodiment of the present invention.
  • FIG. 11 is another schematic diagram of the connection between the whole machine and the capacitive screen provided by the embodiment of the present invention.
  • an embodiment of the present invention provides a capacitive screen smart panel 100, including: a whole machine 10, a capacitive screen 20, a liquid crystal display panel 30, and a COM isolator 40.
  • the liquid crystal display panel 30 is configured. Between the whole machine 10 and the capacitive screen 20.
  • the whole machine 10 includes a whole machine backboard (not shown), a power source 11, a TV main board 12, a capacitive screen control board 13, and a liquid crystal panel driving board 14.
  • the power source 11 is connected to the TV main board 12, the liquid crystal panel driving board 14 is connected to the liquid crystal display panel 30 and the TV main board 12, and the capacitive screen control board 13 is hung on the whole machine back board.
  • the capacitive screen control panel 13 has a first COM interface
  • the TV motherboard 12 has a second COM interface
  • the first COM interface and the second COM interface pass through The COM isolator 40 is connected.
  • the power source 11 supplies power to the TV main board 12, and the liquid crystal panel driving board 14 is connected to the liquid crystal display panel 30, and thus the grounding end of the power source 11 and the grounding of the TV main board 12
  • the terminals are connected to the ground ends of the liquid crystal display panel 30.
  • the TV main board 12 and the capacitive screen control board 13 are directly connected through a COM interface for communication or simultaneous communication and power supply (whether power supply or communication will cause the TV main board 12 and the The capacitive screen control board 13 is connected to the capacitive screen 20, and thus the grounding end of the whole machine 10, the grounding end of the liquid crystal display panel 30, and the The ground terminals of the capacitive screen 20 are all connected.
  • the noise signal of the external power grid and the liquid crystal display panel 30 and the whole machine 10 may all work on the grounding end of the whole machine 10 (the actual grounding end of the whole machine 10 is the whole machine 10).
  • the backplane of the machine is disturbed. Since the grounding end of the whole machine 10 is connected to the grounding end of the capacitive screen 20, the interference of the grounding end of the whole machine 10 is transmitted to the grounding end of the capacitive screen 20, and the When the capacitive screen 20 is in operation, the level of the grounding terminal of the capacitive screen 20 is used as a reference.
  • the second COM interface of the TV main board 12 and the capacitive screen control board 13 The COM isolator 40 is added between the first COM interfaces.
  • the COM isolator 40 is provided with an isolation function, that is, the TV main board 12 and the capacitive screen are ensured under the premise of ensuring normal communication and/or normal power supply and communication between the TV main board 12 and the capacitive screen control board 13.
  • the control board 13 becomes an electrically isolated, independent, ungrounded device.
  • the techniques for implementing isolation include, but are not limited to, transformer isolation, coil isolation, magnetic isolation, optocoupler isolation, etc., and the present invention is not specifically limited.
  • the capacitive screen smart tablet 100 provided by the embodiment of the present invention adds the COM isolation between the second COM interface of the TV motherboard 12 and the first COM interface of the capacitive screen control panel 13
  • the device 40 grounds the TV main board and the capacitive screen control board 13 so that the interference received by the ground end of the whole machine 10 is not transmitted to the ground end of the capacitive screen 20, thereby avoiding the capacitance.
  • the screen 20 is bumped by the grounding end to cause a jump point, and the capacitive screen 20 is improved. The stability of the work.
  • the COM isolator has a signal isolation function or the COM isolator has both a power isolation function and a signal isolation function.
  • the COM interface may be an RS232 interface (based on an RS232 communication protocol), an RS422 interface (based on an RS422 communication protocol), and an RS485 interface (based on an RS482 communication protocol).
  • the RS232 interface has 9 pins.
  • the definition of each pin is shown in Figure 5. It can be seen that in order to communicate, the first COM interface and the second COM interface must be connected three.
  • the pins are the TXD pin, the RXD pin, and the GND pin. Therefore, the COM isolator 40 needs to have a power isolation function and a signal isolation function.
  • the technology for implementing the power isolation includes, but is not limited to, transformer isolation, coil isolation, magnetic isolation, etc., which are not specifically limited in this embodiment.
  • the technology for implementing signal isolation includes, but is not limited to, coil isolation, magnetic isolation, optical coupling isolation (or optical isolation), and the like, which is not specifically limited in this embodiment.
  • each pin of the RS422 interface is shown in Figure 6.
  • the ground pin can be connected or not, and the power pin is generally not connected.
  • the COM isolator 40 needs to have a power isolation function and a signal isolation function.
  • the COM isolator 40 only needs to have a signal isolation function.
  • the RS485 interface has two definitions.
  • the first definition of Figure 7 includes four data transfer pins (TDA-/Y, TDB+/Z, RDA-/A, RDB+/B) and a ground pin GND. Ground pins are usually not connected.
  • the COM isolator 40 needs to have a signal isolation function.
  • the RS485 interface includes two data transfer pins (Data-/B/485-, Data+/A/485+), one ground pin GND, and one power line pin (+9V). ).
  • the ground pin and the power line pin are usually not connected.
  • the COM isolator 40 only needs to have signal isolation function.
  • the capacitive screen smart tablet 100 further includes an AD conversion module 50; the capacitive screen 20 is connected to the capacitive screen control board 13 through a capacitive screen receiving line 21 and a capacitive screen output line 22.
  • the AD conversion module 50 is connected to the capacitive screen receiving line 21.
  • RX1, RX2, and RX3 shown in FIG. 3 are part of the capacitive screen receiving line 21, and the capacitive screen receiving line 21 is used to detect a touch signal (analog signal) detected by the capacitive screen 20.
  • the capacitive screen control panel 13 Transmitted to the capacitive screen control panel 13, the capacitive screen control panel 13 generates touch coordinate information according to the touch signal, and transmits the touch coordinate information to the TV motherboard 12, which is to be
  • the touch coordinate information is converted into a touch coordinate value and sent to an external device 60 (such as a PC module or an Android module), and the external device 60 responds according to the touch coordinate value, and sends the image information generated after the response to
  • the TV main board 12 transmits the image signal and the screen driving command to the liquid crystal display driving board 14 , and the liquid crystal display driving board 14 drives the liquid crystal display panel 30 according to the driving command. And the image information is finally displayed by the display.
  • the capacitive screen receiving line 21 may be relatively long due to wiring requirements, which may result in transmission within the capacitive screen receiving line 21.
  • the signal is subject to large interference.
  • the transmitted signal is an analog signal, it will generate distortion and superimposed clutter after being interfered, and such distortion and superimposed clutter are difficult to eliminate and recover, and thus may cause touch.
  • the coordinate information is inaccurate, resulting in inaccurate final touch position determination.
  • the AD conversion module 50 is added to each of the capacitive screen receiving lines 21, and the AD conversion module 50 can convert an analog signal into a digital signal, although the digital signal is transmitted. There may also be problems in the process due to interference, but the error can be passed.
  • the anti-interference coding is eliminated in advance, so the accuracy of the touch coordinate information can be ensured, and the accuracy of the touch position judgment can be improved.
  • the AD conversion module 50 is disposed at one end of the capacitive screen receiving line 21 connected to the capacitive screen 20.
  • the AD conversion module 50 is disposed at one end of the capacitive screen receiving line 21 connected to the capacitive screen 20, that is, the analog signal is just generated and transmitted on the capacitive screen receiving line 21.
  • the problem that the analog signal is difficult to recover after being interfered by the interference can be minimized, and the accuracy of the touch point judgment is improved.
  • the AD conversion module 50 can also be disposed at one end of the capacitive screen receiving line 21 close to the capacitive screen 20, which is not specifically limited by the present invention.
  • the capacitive screen receiving line 21 and the capacitive screen output line 22 are taken out from the capacitive screen control board 13 and connected to the capacitive screen along the inner wall of the whole backplane;
  • the capacitive screen receiving line 21 and the capacitive screen output line 22 have a conductor layer, a first insulating layer encasing the conductor layer, and a shielding layer disposed outside the first insulating layer.
  • the back plate of the whole machine is made of a metal material, and on the one hand, functions as a fixed support, and the TV circuit board 12, the capacitive screen control board 13 and various circuit board covers are fixed at the whole.
  • the whole machine backplane is also the largest ground in the whole machine 10, in the sense of the circuit.
  • the capacitive screen receiving line 21 and the capacitive touch screen emitting line 24 are closely aligned with the inner wall of the whole machine backplane.
  • the whole backplane may be subjected to the liquid crystal display.
  • the panel 30 interferes, and the entire backplane is disturbed to generate spatial radiation that interferes with signals transmitted within the capacitive screen receiving line 21 and the capacitive screen output line 22.
  • the capacitive screen receiving line 21 has a conductor layer 211 and a first insulating layer enclosing the conductor layer 211 . 212 and a shielding layer 213 disposed outside the first insulating layer 212.
  • the conductor layer 211 is used for signal transmission
  • the first insulating layer 212 functions to insulate the conductor layer 211
  • the shielding layer 213 may be a metal shielding layer. The interference of the spatial radiation of the entire backplane to the signals transmitted within the conductor layer 211 can be shielded.
  • the shielding layer 213 since the shielding layer 233 is a metal shielding layer, the shielding layer 213 needs to be insulated. Specifically, a second insulating layer 214 surrounding the shielding layer 213 may be disposed outside the shielding layer 213, or an insulating spacer may be interposed between the shielding layer 213 and the whole backing plate, so that the The shielding layer 213 is physically separated from the whole machine backplane, and may also be insulated by a portion of the whole machine backplane that is in contact with the shielding layer 213, wherein, preferably, the shielding layer is A second insulating layer 214 covering the shielding layer 213 is disposed outside the layer 213, and a better insulating effect has been achieved.
  • the capacitive screen output line 22 is also subjected to similar insulation treatment, and the present invention will not be described herein.
  • the smart tablet 100 further includes a power isolator 70, and the power source 11 is connected to the capacitive screen control board 13 through the power isolator 70.
  • the capacitive screen control board 13 cannot be powered directly by the TV motherboard 12 through the COM interface.
  • the pins between the two COM interfaces do not contain power pins or the power pins are not connected or the pins between the two COM interfaces contain power pins, but the power provided is not sufficient to drive the capacitive screen control board. 13 work.
  • the power supplied through the power pins is often insufficient to drive the capacitive screen control board 13.
  • the capacitive screen control panel 13 is directly powered by the power source 11, at this time, between the power source 11 and the capacitive screen control panel 13.
  • a power isolator 70 is connected to implement power isolation between the power source 11 and the capacitive screen control board 13, so that the ground of the power supply 11, the TV main board 12 and the ground of the capacitive screen 20 are no longer connected, thereby avoiding The grounding interference received by the grounding end of the whole machine 10 affects the grounding end of the capacitive screen 20.
  • the liquid crystal panel driving board 14 also has two power supply modes.
  • the liquid crystal panel driving board 14 can be powered by the TV main board 12, and is for a large size.
  • the smart panel, the LCD panel driver board 14 is powered by the power source 11.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

L'invention concerne une tablette intelligente à écran tactile capacitif. La tablette intelligente comprend : une machine complète (10), un écran tactile capacitif (20), un panneau d'affichage à cristaux liquides (30) et un isolateur COM (40). Le panneau d'affichage à cristaux liquides (30) est disposé entre la machine complète (10) et l'écran tactile capacitif (20), la machine complète (10) comprenant un panneau arrière de machine complète, une source d'alimentation (11), une carte principale de télévision (12), une carte de commande d'écran tactile capacitif (13) et une carte d'attaque d'écran à cristaux liquides (14) ; la source d'alimentation (11) est connectée à la carte principale de télévision (12) ; la carte d'attaque d'écran à cristaux liquides (14) est connectée au panneau d'affichage à cristaux liquides (30) et à la carte principale de télévision (12) ; la carte de commande d'écran tactile capacitif (13) est suspendue sur le panneau arrière de machine complète, et est connectée à l'écran tactile capacitif (20) ; et la carte de commande d'écran tactile capacitif (13) est pourvue d'une première interface COM, la carte principale de télévision (12) est pourvue d'une seconde interface COM, et la première interface COM est connectée à la seconde interface COM par l'intermédiaire de l'isolateur COM (40). Au moyen de l'ajout de l'isolateur COM (40) afin d'isoler la machine complète (10) de l'écran tactile capacitif (20), l'interférence de mise à la masse subie par la machine complète (10) ne peut pas être transférée à l'écran tactile capacitif (20), assurant ainsi un fonctionnement stable de l'écran tactile capacitif.
PCT/CN2017/104954 2017-05-26 2017-09-30 Tablette intelligente à écran tactile capacitif WO2018214375A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201720604368.8 2017-05-26
CN201720604368.8U CN207115251U (zh) 2017-05-26 2017-05-26 一种电容屏智能平板

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WO2018214375A1 true WO2018214375A1 (fr) 2018-11-29

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CN102156410A (zh) * 2011-04-19 2011-08-17 长沙三优合达电子科技有限公司 智能人机交互设备
CN102955617A (zh) * 2012-11-29 2013-03-06 沈阳信达信息科技有限公司 触摸屏触点反馈装置
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CN203444473U (zh) * 2013-08-05 2014-02-19 应城骏腾发自动焊接装备有限公司 用于io串口的扩展和抗干扰装置
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CN204117569U (zh) * 2014-10-29 2015-01-21 中兴威视(大连)科技发展有限公司 一种带抗干扰接口的工业控制主板
CN104461180A (zh) * 2013-09-12 2015-03-25 广州市和唐电子科技有限公司 一种电容式触摸屏防干扰装置及方法
US9292091B1 (en) * 2006-12-21 2016-03-22 Cypress Semiconductor Corporation Feedback mechanism for user detection of reference location on a sensing device
CN107168467A (zh) * 2017-05-26 2017-09-15 广州视源电子科技股份有限公司 一种电容屏智能平板

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9292091B1 (en) * 2006-12-21 2016-03-22 Cypress Semiconductor Corporation Feedback mechanism for user detection of reference location on a sensing device
CN102156410A (zh) * 2011-04-19 2011-08-17 长沙三优合达电子科技有限公司 智能人机交互设备
CN103592996A (zh) * 2012-08-14 2014-02-19 长春迪派斯科技有限公司 插卡式多通道函数/任意波形发生器的结构及装置
CN102955617A (zh) * 2012-11-29 2013-03-06 沈阳信达信息科技有限公司 触摸屏触点反馈装置
CN203444473U (zh) * 2013-08-05 2014-02-19 应城骏腾发自动焊接装备有限公司 用于io串口的扩展和抗干扰装置
CN203480488U (zh) * 2013-09-12 2014-03-12 广州市和唐电子科技有限公司 一种电容式触摸屏防干扰装置
CN104461180A (zh) * 2013-09-12 2015-03-25 广州市和唐电子科技有限公司 一种电容式触摸屏防干扰装置及方法
CN204117569U (zh) * 2014-10-29 2015-01-21 中兴威视(大连)科技发展有限公司 一种带抗干扰接口的工业控制主板
CN107168467A (zh) * 2017-05-26 2017-09-15 广州视源电子科技股份有限公司 一种电容屏智能平板

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