WO2018214379A1 - 一种电容屏智能平板 - Google Patents
一种电容屏智能平板 Download PDFInfo
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- WO2018214379A1 WO2018214379A1 PCT/CN2017/104992 CN2017104992W WO2018214379A1 WO 2018214379 A1 WO2018214379 A1 WO 2018214379A1 CN 2017104992 W CN2017104992 W CN 2017104992W WO 2018214379 A1 WO2018214379 A1 WO 2018214379A1
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- Prior art keywords
- capacitive screen
- interface
- smart tablet
- isolator
- tablet according
- Prior art date
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- 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
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
- G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
-
- 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
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- 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
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
- G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
- G06F1/1643—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being associated to a digitizer, e.g. laptops that can be used as penpads
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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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
-
- 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
Definitions
- the invention relates to the field of smart tablets, 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 inventor discovered through further research that the main reason for this jump point is that the noise signal of the external power grid and the liquid crystal display panel and the whole machine will interfere with the grounding of the whole machine during operation, because the whole machine and the capacitive screen perform USB.
- 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. Therefore, when the grounding is disturbed, it may cause a change in the reference, resulting in a capacitive screen jump point.
- an object of the present invention is to provide a capacitive screen smart panel, which can avoid the interference of the whole machine to the grounding of the capacitive screen, and solve the jumping point phenomenon caused by the interference of the capacitive screen.
- the invention provides a capacitive screen smart panel, comprising: a whole machine, a capacitive screen, a liquid crystal display panel and an isolator, wherein the liquid crystal display panel is disposed between the whole machine and the capacitive screen; wherein, the whole
- the device includes a power source, a TV motherboard, a capacitive screen control panel, and a liquid crystal panel driving board; the power source is connected to the TV motherboard; the LCD panel driving board is connected to the liquid crystal display panel and the TV motherboard, and the capacitive screen
- the control panel is connected to the capacitive screen; the capacitive screen control panel has a first interface, the TV motherboard has a second interface, and the first interface and the second interface are connected by the isolator.
- the isolator has a signal isolation function.
- the isolator has both a power isolation function and a signal isolation function.
- the first interface and the second interface are USB interfaces
- the isolator is a USB isolator.
- the first interface and the second interface are USB2.0 interfaces.
- the first interface and the second interface are USB3.0 interfaces.
- the first interface and the second interface are interfaces based on a VB1 protocol.
- the first interface and the second interface are interfaces based on a UART protocol.
- the first interface and the second interface are interfaces based on an SPI protocol.
- the first interface and the second interface are COM ports.
- the first interface and the second interface are interfaces based on an I2C protocol.
- the capacitive screen smart tablet further includes an AD conversion module; the capacitive screen is connected to the capacitive screen control board through a capacitive screen receiving line and a capacitive screen output line, and the AD conversion module is connected to the capacitive screen to receive on-line.
- AD conversion module is connected to the capacitive screen to receive on-line.
- the AD conversion module is disposed at one end of the capacitive screen receiving line connected to the capacitive screen.
- the whole machine further includes a whole machine backplane, the capacitive screen control board is hung on the whole machine backboard; the capacitive screen receiving line and the capacitive screen output line are controlled from the capacitive screen
- the board is led out and connected to the capacitive screen body along the inner wall of the whole backplane; wherein the capacitor receiving line and the capacitor output line have a conductor layer and a first insulation covering the conductor layer And a shielding layer covering the first insulating layer, and the shielding layer is insulated from the inner wall of the whole backing plate.
- 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, by adding the isolator between the TV main board and the capacitive screen control board, so that the interference received by the grounding end of the whole machine is not transmitted to the The grounding end of the capacitive screen further avoids the phenomenon that the capacitive screen is caused by the interference of the whole machine, which improves the working stability of the capacitive screen.
- 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 diagram of a connection of a whole machine according to an embodiment of the present invention.
- FIG. 3 is a schematic diagram of the whole machine and the capacitive screen isolated by the isolator according to the embodiment of the present invention.
- FIG. 4 is a schematic diagram of a connection between interfaces based on a VB1 protocol according to an embodiment of the present invention.
- FIG. 5 is a schematic diagram of a connection between interfaces based on a UART protocol according to an embodiment of the present invention.
- FIG. 6 is a schematic diagram of a connection between interfaces based on an SPI protocol according to an embodiment of the present invention.
- FIG. 7 is a schematic diagram of an RS232 interface according to an embodiment of the present invention.
- Figure 8 is a pin definition diagram of the RS232 interface of Figure 7.
- Figure 9 is a pin definition diagram of the RS422 interface.
- Figure 10 is the first pin definition of the RS485 interface.
- Figure 11 is a second pin definition of the RS485 interface.
- FIG. 12 is a schematic diagram of a connection between interfaces based on an I2C protocol according to an embodiment of the present invention.
- FIG. 13 is a schematic diagram of another connection between a whole machine and a capacitive screen according to an embodiment of the present invention.
- FIG. 14 is a schematic cross-sectional view of a capacitive screen receiving according to an embodiment of the present invention.
- FIG. 15 is another schematic diagram of a connection between a whole machine and a capacitive screen according to an 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 an isolator 40.
- the liquid crystal display panel 30 is configured.
- the whole machine 10 includes 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 supply 11 is connected to the TV main board 12, the liquid crystal display 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 connected to the capacitive screen 20;
- the screen control board 13 has a first interface, and the TV main board 12 has a second interface, and the first interface and the second interface are connected by the isolator 40.
- 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 ground end of the power source 11 and the ground end of the TV main board 12
- the ground ends of the liquid crystal display panel 30 are connected to each other.
- the TV main board 12 and the capacitive screen control board 13 are directly connected through an interface for communication or simultaneous communication and power supply (whether power supply or communication) causes the TV main board 12 and the capacitor.
- the screen control panel 13 is connected to the capacitor screen 20, and thus the grounding end of the power source 11 (ie, the grounding end of the whole machine 10) and the liquid crystal display panel are actually connected.
- the ground terminal of 30 and the ground terminal 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 isolation is added between the TV main board 12 and the capacitive screen control board 13. 40.
- the isolator 40 is provided with an isolation function, that is, the TV main board 12 and the capacitive screen are controlled 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 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. The invention is not specifically limited.
- the capacitive screen smart tablet 100 provided by the embodiment of the present invention adds the isolator 40 to the TV main board and the capacitive screen between the TV main board 12 and the capacitive screen control board 13 .
- the control panel 13 is isolated, so that the interference received by the grounding end of the whole machine 10 is not transmitted to the grounding end of the capacitive screen 20, thereby preventing the capacitive screen 20 from jumping due to interference of the grounding end.
- the working stability of the capacitive screen 20 is improved.
- the first interface and the second interface are USB interfaces
- the isolator is a USB isolator.
- the USB interface may be a USB 2.0 interface or a USB 3.0 interface, which is not specifically limited in the present invention.
- the isolator is a USB isolator.
- USB2.0 Taking USB2.0 as an example, it consists of 4 lines in the physical layer: two provide 5V power and ground to the peripherals, and the other two (D+ and D-) form a twisted pair that can transmit differential data. Among them, in the USB transmission, data is transmitted through the high and low levels of the D+ and D- signal lines.
- the USB isolator needs to have the power isolation function of the isolated 5V power line and the isolated signal lines (D+ and D). -) Signal isolation.
- the technology of the power isolation function includes, but is not limited to, transformer isolation, coil isolation, magnetic isolation, and dedicated isolation power isolation, which are not specifically limited in the present invention.
- the techniques of the signal isolation function include, but are not limited to, optocoupler isolation, coil isolation, magnetic isolation, etc., which are not specifically limited in the present invention.
- the USB isolator can be formed by adding a power isolation technology (such as a power isolation chip) to the ADUM4160 chip (USB signal isolator, isolation principle is magnetic isolation).
- a power isolation technology such as a power isolation chip
- ADUM4160 chip USB signal isolator, isolation principle is magnetic isolation
- other methods may be used to implement power isolation and signal isolation. These implementation methods are all within the scope of the present invention and will not be described herein.
- the first interface and the second interface are interfaces based on a VB1 protocol.
- the communication protocol for VB1 data transmission is as follows: VB1 uses two control pins during signal transmission, one is the hot-swap pin HTPDN, and the other is the clock lock pin LOCKN, both of which are pulled by pull-up resistors.
- HTPDN hot-swap pin
- LOCKN clock lock pin
- the isolator 40 can be an isolator based on the VB1 protocol. Since only the communication signal is transmitted between the first interface and the second interface, the isolator 40 only needs to be The signal isolation function is sufficient.
- the implementation of the specific signal isolation function includes, but is not limited to, optocoupler isolation, magnetic isolation, coil isolation, etc., which are not specifically limited in this embodiment.
- the first interface and the second interface are interfaces based on a UART protocol.
- Each UART interface includes four pins: VCC: power supply pin, generally 3.3v; GND: ground pin; RXD: receive data pin; TXD: send data pin, its working principle is
- VCC power supply pin
- GND ground pin
- RXD receive data pin
- TXD send data pin
- Each character of the transmitted data is transmitted bit by bit. The meaning of each of them is as follows: Start bit: A signal of logic "0" is issued first, indicating the beginning of the transmitted character. Data bit: Immediately after the start bit. The number of data bits can be 4, 5, 6, 7, 8, etc., forming one character. Usually ASCII code is used. The transmission starts from the lowest bit and is located by the clock.
- Parity When this bit is added to the data bit, the number of bits in the "1" should be even (even parity) or odd (odd parity) to verify the correctness of the data transfer.
- Stop bit It is the end of a character data. It can be a high level of 1 bit, 1.5 bits, or 2 bits. Since the data is timed on the transmission line and each device has its own clock, it is likely that there is a small out-of-synchronization between the two devices in the communication. The stop bit therefore not only indicates the end of the transmission, but also provides the opportunity for the computer to correct the clock synchronization. The more bits that apply to the stop bit, the greater the tolerance of different clock synchronizations, but the slower the data transfer rate.
- the UART has two connection modes. The first one is to connect only the TXD and RXD pins. In this case, the isolator 40 only needs to have signal isolation function. The second type is that all four pins are connected. In this case, the isolator 40 needs to have both a signal isolation function and a power isolation function.
- the first interface and the second interface are interfaces based on an SPI protocol.
- the communication process of SPI is shown in Figure 6.
- the SPI has four signal lines, namely SCLK: serial clock, which is used for synchronous data transmission and output by the host; MOSI: host output slave input data line; MISO: host input from Machine output data line; SS: chip select line, active low, output by the host.
- SCLK serial clock
- MOSI host output slave input data line
- MISO host input from Machine output data line
- SS chip select line, active low, output by the host.
- On the SPI bus multiple slaves can appear at a time, but only one master can exist. The master determines the slave to communicate through the chip select line.
- the isolator 40 since the first interface and the second interface only perform signal communication, the isolator 40 only needs to have a signal isolation function.
- the first interface and the second interface are COM ports.
- the COM port may be an RS232 interface, an RS422 interface, an RS485 interface, or other customized interface.
- the RS232 interface has 9 pins.
- the definition of each pin is shown in Figure 8. It can be seen that for communication, three references must be connected between the first interface and the second interface.
- the pins are the TXD pin, the RXD pin, and the GND pin. Therefore, the isolator 40 needs to have a power isolation function and a signal isolation function.
- each pin of the RS422 interface is shown in Figure 9, where the ground pin can be connected or not.
- the power pins are generally not connected.
- the isolator 40 needs to have a power isolation function and a signal isolation function.
- the isolator 40 is provided with a signal isolation function.
- the RS485 interface has two definitions.
- the first definition of Figure 10 includes four data transfer pins (TDA-/Y, TDB+/Z, RDA-/A, RDB+/B) and a ground pin GND. Ground pins are usually not connected. At this time, the 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. In this case, the isolator 40 needs to have a signal isolation function.
- the first interface and the second interface are interfaces based on an I2C protocol.
- the I2C bus is very simple in physical connection, consisting of SDA (serial data line) and SCL (serial clock line) and pull-up resistors.
- the communication principle is to generate the signals required by the I2C bus protocol for data transmission by controlling the high and low timings of the SCL and SDA lines.
- the two wires are generally pulled high by the pull-up resistor connected above, and remain high.
- Each module circuit connected on the bus is both a master (the master must have a CPU)
- the logic module) (or the controller) is the transmitter (or receiver), but there is only one host in the system, and the clock signal is generated by the host.
- the isolator 40 needs to have a 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 40 is connected to the capacitive screen receiving line 21.
- RX1, RX2, and RX3 shown in FIG. 3 are a part of the capacitive screen receiving line 21.
- the capacitive screen receiving line 21 is configured to send a touch signal (analog signal) detected by the capacitive screen 20 to the capacitive screen control panel 13, and the capacitive screen control panel 13 generates a touch according to the touch signal.
- Coordinate information, and the touch coordinate information is sent to the TV main board 12, and the touch coordinate information is converted into a touch coordinate value by the TV main board 12, and sent to an external device 60 (such as a PC module or an Android module)
- the external device 60 responds according to the touch coordinate value, and sends the image information generated after the response to the TV motherboard 12, and the TV motherboard 12 sends the image signal and the screen driving command to the liquid crystal display.
- the driving board 14 drives the liquid crystal display panel 30 according to the driving command, and finally displays the image information 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 in the transmission process. There may also be a problem of bit error due to interference, but such an error can be eliminated by prior anti-interference coding, thereby ensuring the accuracy of touch coordinate information and improving the accuracy of touch position determination.
- 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 may 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 whole machine 10 further includes a whole machine backplane, and the capacitive screen control board 13 is mounted on the 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 machine 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 encasing the first insulating layer, the shielding layer and the shielding layer
- the inner wall of the back plate of the whole machine is insulated.
- 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 surrounding the first insulating layer 212, and the shielding layer 213 is insulated from the whole backing plate.
- 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. Since the shielding layer 233 is a metal shielding layer, it is also necessary to perform insulation treatment on the shielding layer 213.
- 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 similarly insulated, 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 panel 13 cannot be powered directly by the TV motherboard 12 through the interface.
- the pins of the interface do not contain power pins or the power pins are not connected or the pins of the interface contain power pins, but the power provided is not sufficient to drive the capacitive screen control board 13 to operate.
- the power supplied through the power supply pin is often insufficient to drive the capacitive screen control panel 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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Abstract
一种电容屏智能平板(100),包括:整机(10)、电容屏(20)、液晶显示面板(30)及隔离器(40),所述液晶显示面板(30)设置于所述整机(10)与所述电容屏(20)之间;其中,所述整机(10)包括电源(11)、TV主板(12)、电容屏控制板(13)及液晶屏驱动板(14);所述电源(11)与所述TV主板(12)连接;所述液晶屏驱动板(14)与所述液晶显示面板(30)及所述TV主板(12)连接;所述电容屏控制板(13)与所述电容屏(20)连接;所述电容屏控制板(13)具有第一接口,所述TV主板(12)具有第二接口,所述第一接口与所述第二接口通过所述隔离器(40)连接。通过增加隔离器(40)对整机(10)与所述电容屏(20)进行隔离,从而使得整机(10)受到的接地干扰不会传导给所述电容屏(20),保证电容屏(20)的稳定工作。
Description
本发明涉及智能平板领域,尤其涉及一种电容屏智能平板。
智能平板是通过触控技术对显示在显示平板上的内容进行操控以实现人机交互的一体化设备。智能平板集成了投影机、电子白板、幕布、音响、电视机、视频会议终端的多种功能,适用于群体沟通场合,集中解决了会议中远程音视频沟通,各种格式会议文档高清晰显示,视频文件播放,现场音响,屏幕书写,文件标注、保存、打印和分发等***化会议需求,广泛应用于教育教学、企业会议、商业展示等领域,可有效改善沟通环境、提升群体沟通效率。
目前常用的智能平板根据触控类型大致可分为红外屏智能平板及电容屏智能平板。红外屏(Infrared Touch Screen Technology)由触摸屏及装在触摸屏外框上的红外线发射与接收感测元件构成,红外线发射与接收感测元件在屏幕表面上形成红外线探测网,任何触摸物体可改变触点上的红外线而实现触摸屏操作。电容屏则是利用人体的电流感应进行工作的。红外触摸屏的优点是价格便宜,且不受电流、电压和静电干扰,适宜恶劣的环境条件,缺点是分辨率低,且由于增加了外框,导致整机厚度的增加。电容屏的优点是书写体验流畅,分辨率高,且能做到整机轻薄,但电容屏的缺点是容易受外界环境的干扰产生漂移,导致触摸不准或无法触摸书写。例如,当环境温度、湿度改变时,都会引起电容屏的漂移,造成触控不准确。电容屏的漂移原因属于技术上的先天不足,环境电势面(包括用户的身体)虽然与电容触摸屏离得较远,却比手指头面积大的多,这些因素都直接影响触摸位置的确定。
发明内容
但发明人在将电容屏应用于智能平板,特别是大尺寸的智能平板过程中发现,即使排除掉外界环境干扰的影响,电容屏仍然会出现跳点或者书写中断的现象,且这种现象的产生原因在目前尚未有合理的解释。发明人通过进一步研究发现,这种跳点产生的主要原因是外部电网地的杂讯信号以及液晶显示面板和整机在工作时会对整机的接地产生干扰,由于整机与电容屏进行USB通讯以及对电容屏进行供电的需要,整机的接地与电容屏的接地需要连接,这就引起整机接地的干扰传导到电容屏的接地,而电容屏工作时需以其本身的接地作为参考,因此当接地被干扰后,就可能引起参考的变化,导致电容屏跳点。
针对上述问题,本发明的目的在于提供一种电容屏智能平板,其可避免整机对电容屏的接地的干扰,解决了电容屏因干扰产生的跳点现象。
本发明提供了一种电容屏智能平板,包括:整机、电容屏、液晶显示面板及隔离器,所述液晶显示面板设置于所述整机与所述电容屏之间;其中,所述整机包括电源、TV主板、电容屏控制板及液晶屏驱动板;所述电源与所述TV主板连接;所述液晶屏驱动板与所述液晶显示面板及所述TV主板连接,所述电容屏控制板与所述电容屏连接;所述电容屏控制板具有第一接口,所述TV主板具有第二接口,所述第一接口与所述第二接口通过所述隔离器连接。
优选地,所述隔离器具有信号隔离功能。
优选地,所述隔离器同时具有电源隔离功能和信号隔离功能。
优选地,所述第一接口及所述第二接口为USB接口,所述隔离器为USB隔离器。
优选地,所述第一接口和所述第二接口为USB2.0接口。
优选地,所述第一接口和所述第二接口为USB3.0接口。
优选地,所述第一接口和所述第二接口为基于VB1协议的接口。
优选地,所述第一接口和所述第二接口为基于UART协议的接口。
优选地,所述第一接口和所述第二接口为基于SPI协议的接口。
优选地,所述第一接口和所述第二接口为COM口。
优选地,所述第一接口和所述第二接口为基于I2C协议的接口。
优选地,所述电容屏智能平板还包括AD转换模块;所述电容屏通过电容屏接收线及电容屏输出线与所述电容屏控制板连接,所述AD转换模块连接于所述电容屏接收线上。
优选地,所述AD转换模块设置于所述电容屏接收线的与所述电容屏连接的一端。
优选地,所述整机还包括整机背板,所述电容屏控制板挂设于所述整机背板上;所述电容屏接收线及所述电容屏输出线从所述电容屏控制板引出,并沿所述整机背板的内壁走线后连接至所述电容屏本体;其中,所述电容接收线及所述电容输出线具有导体层、包裹所述导体层的第一绝缘层及包裹所述第一绝缘层的屏蔽层,所述屏蔽层与所述整机背板的内壁之间进行绝缘处理。
优选地,所述屏蔽层外设置有包裹所述屏蔽层的第二绝缘层;或者
所述屏蔽层与所述整机背板的内壁之间垫有绝缘垫块;或者
所述整机背板的内壁与所述屏蔽层接触的部分贴有绝缘胶布。
优选地,还包括电源隔离器,所述电源通过所述电源隔离器与所述电容屏控制板连接。
本发明实施例提供的电容屏智能平板,通过在所述TV主板与所述电容屏控制板之间加入所述隔离器,使得所述整机的接地端受到的干扰不会传到给所述电容屏的接地端,进而避免了电容屏因整机受到干扰而产生跳点的现象,提高了所述电容屏的工作稳定性。
为了更清楚地说明本发明的技术方案,下面将对实施方式中所需要使用的
附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施方式,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1是本发明实施例提供的电容屏智能平板的结构示意图。
图2是本发明实施例提供的整机的一种连接示意图。
图3是本发明实施例提供的整机与电容屏通过隔离器进行隔离的示意图。
图4是本发明实施例提供的基于VB1协议的接口之间的连接示意图。
图5是本发明实施例提供的基于UART协议的接口之间的连接示意图。
图6是本发明实施例提供的基于SPI协议的接口之间的连接示意图。
图7是本发明实施例提供的RS232接口的示意图。
图8是图7的RS232接口的引脚定义图。
图9是RS422接口的引脚定义图。
图10是RS485接口的第一种引脚定义图。
图11是RS485接口的第二种引脚定义图。
图12是本发明实施例提供的基于I2C协议的接口之间的连接示意图。
图13是本发明实施例提供的整机与电容屏的另一种连接示意图。
图14是本发明实施例提供的电容屏接收的截面示意图。
图15是本发明实施例提供的整机与电容屏的另一种连接示意图。
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
请参阅图1至图3,本发明实施例提供了一种电容屏智能平板100,包括:整机10、电容屏20、液晶显示面板30及隔离器40,所述液晶显示面板30设置
于所述整机10与所述电容屏20之间;其中,所述整机10包括电源11、TV主板12、电容屏控制板13及液晶屏驱动板14。所述电源11与所述TV主板12连接,所述液晶屏驱动板14与所述液晶显示面板30及TV主板12连接,所述电容屏控制板13与所述电容屏20连接;所述电容屏控制板13具有第一接口,所述TV主板12具有第二接口,所述第一接口与所述第二接口通过所述隔离器40连接。
在本发明实施例中,所述电源11向所述TV主板12供电,所述液晶屏驱动板14与所述液晶显示面板30连接,因而所述电源11的接地端、TV主板12的接地端与液晶显示面板30的接地端彼此连接。在现有技术中,所述TV主板12与所述电容屏控制板13通过接口直接连接以进行通讯或者同时进行通讯和供电(无论是供电或者是通讯都会导致所述TV主板12与所述电容屏控制板13共地),而所述电容屏控制板13与所述电容屏20也直接连接,因而实际上,所述电源11的接地端(即整机10的接地端)、液晶显示面板30的接地端及所述电容屏20的接地端都是连接的。在实际工作过程中,外部电网地的杂讯信号以及液晶显示面板30和整机10在工作时均可能对所述整机10的接地端(整机10的实际接地端为整机10的整机背板)产生干扰,由于整机10的接地端与所述电容屏20的接地端连接,因而所述整机10的接地端的干扰将传导到所述电容屏20的接地端,而所述电容屏20工作时需以其本身的接地端的电平作为参考,因此当所述电容屏20的接地端被干扰后,就可能引起参考电平的变化,导致所述电容屏20在触控过程出现跳点。特别的,当应用于大尺寸的电容屏时,由于工作电压的增加,这种干扰就更为明显,严重时甚至可能出现电容屏无法书写。
在本发明实施例中,为了防止所述整机10的接地端的干扰传导到所述电容屏20的接地端,在所述TV主板12与所述电容屏控制板13之间加入了所述隔离器40。所述隔离器40具备隔离功能,即在保证所述TV主板12与所述电容屏控制板13正常通讯和/或正常供电及通讯的前提下,使得所述TV主板12与所述电容屏控制板13成为在电气上被隔离的、独立的不接地设备。其中,用于实现隔离的技术包括但不限于变压器隔离、线圈隔离、磁隔离、光耦隔离等,
本发明不做具体限定。
综上所述,本发明实施例提供的电容屏智能平板100,通过在所述TV主板12与所述电容屏控制板13之间加入所述隔离器40对所述TV主板与所述电容屏控制板13进行隔离,使得所述整机10的接地端受到的干扰不会传导到所述电容屏20的接地端,进而避免了所述电容屏20因接地端受到干扰而产生跳点的现象,提高了所述电容屏20的工作稳定性。
为便于对本发明的理解,下面对本发明的一些优选实施例做更一步的描述。
优选地,所述第一接口及所述第二接口为USB接口,所述隔离器为USB隔离器。
其中,所述USB接口可为USB2.0接口或USB3.0接口,本发明不做具体限定。相应的,所述隔离器为USB隔离器。
以USB2.0为例,其在物理层包含4条线:两条向外设提供5V电源和接地,另外两条(D+和D-)构成可传递差分数据的双绞线。其中,USB传输中通过D+和D-两条信号线传递高低电平来传输数据。
在本优选实施例中,由于第一接口与所述第二接口之间同时进行通讯以及供电,因此所述USB隔离器需同时具备隔离5V电源线的电源隔离功能以及隔离信号线(D+和D-)的信号隔离功能。
其中,电源隔离功能的技术包括但不限于变压器隔离、线圈隔离、磁隔离、专用隔离电源隔离,本发明不做具体限定。
信号隔离功能的技术包括但不限于光耦隔离、线圈隔离、磁隔离等,本发明不做具体限定。
在本实施例中,例如,所述USB隔离器可通过在ADUM4160芯片(USB信号隔离器,隔离原理为磁隔离)加入电源隔离技术(如加电源隔离芯片)形成。此外,在本发明的其他实施例中,还可有其他的方法同时实现电源隔离及信号隔离,这些实现方法均在本发明的保证范围之内,在此不做赘述。
优选地,所述第一接口和所述第二接口为基于VB1协议的接口。
如图4所示,VB1数据传输的通信协议如下:VB1在信号传输过程中会用到2个控制脚,一个是热插拔脚HTPDN,一个是时钟锁定脚LOCKN,两者都通过上拉电阻拉高,持续为高时,传送端***接入接收设备或者处于未激活状态。接收端接入工作后,HTPDN置低,开始进行CDRtraining(时钟数据恢复),传送端启动并锁定时钟频率,接收端完成时钟恢复后,将LOCKN置低,开始ALNtraining,完成后才开始可用数据的传输。
在本优选实施例中,所述隔离器40可为基于VB1协议的隔离器,由于所述第一接口和所述第二接口之间仅进行通讯信号的传输,因而所述隔离器40只需具备信号隔离功能即可,具体的信号隔离功能的实现技术包括但不限于光耦隔离、磁隔离、线圈隔离等,本实施例不做具体限定。
优选地,所述第一接口和所述第二接口为基于UART协议的接口。
UART的通信方式如图5所示,每个UART接口包括四个pin:VCC:供电pin,一般是3.3v;GND:接地pin;RXD:接收数据pin;TXD:发送数据pin,其工作原理是将传输数据的每个字符一位接一位地传输。其中各位的意义如下:起始位:先发出一个逻辑”0”的信号,表示传输字符的开始。资料位:紧接着起始位之后。资料位的个数可以是4、5、6、7、8等,构成一个字符。通常采用ASCII码。从最低位开始传送,靠时钟定位。奇偶校验位:资料位加上这一位后,使得“1”的位数应为偶数(偶校验)或奇数(奇校验),以此来校验资料传送的正确性。停止位:它是一个字符数据的结束标志。可以是1位、1.5位、2位的高电平。由于数据是在传输线上定时的,并且每一个设备有其自己的时钟,很可能在通信中两台设备间出现了小小的不同步。因此停止位不仅仅是表示传输的结束,并且提供计算机校正时钟同步的机会。适用于停止位的位数越多,不同时钟同步的容忍程度越大,但是数据传输率同时也越慢。空闲位:处于逻辑“1”状态,表示当前线路上没有资料传送。波特率:是衡量资料传送速率的指标。表示每秒钟传送的符号数(symbol)。一个符号代表的信息量(比特数)
与符号的阶数有关。例如资料传送速率为120字符/秒,传输使用256阶符号,每个符号代表8bit,则波特率就是120baud,比特率是120*8=960bit/s。
在实际情况中,UART有两种连接方式,第一种是仅连接TXD和RXD两个引脚,此时所述隔离器40仅需具备信号隔离功能即可。第二种是四个引脚都相连,此时,所述隔离器40需同时具备信号隔离功能和电源隔离个功能。
优选地,所述第一接口和所述第二接口为基于SPI协议的接口。
SPI的通讯过程如图6所示,SPI有4条信号线,分别为SCLK:串行时钟,用来同步数据传输,由主机输出;MOSI:主机输出从机输入数据线;MISO:主机输入从机输出数据线;SS:片选线,低电平有效,由主机输出。在SPI总线上,某一时刻可以出现多个从机,但只能存在一个主机,主机通过片选线来确定要通信的从机。
在本实施例中,由于所述第一接口与所述第二接口仅进行信号通讯,因而所述隔离器40仅需具备信号隔离功能即可。
优选地,所述第一接口和所述第二接口为COM口。
在本实施例中,所述COM口可以为RS232接口、RS422接口、RS485接口或其他自定义的接口。
下面分别针对上述的三种接口进行描述。
针对RS232接口的情况:
如图7所示,RS232接口有9个引脚,每个引脚的定义如图8所示,可以看出,为了进行通讯,第一接口和第二接口之间必须要连的三个引脚是TXD引脚、RXD引脚和GND引脚。因此,所述隔离器40需具备电源隔离功能和信号隔离功能。
针对RS422接口的情况:
RS422接口的各个引脚的定义如图9所示,其中,地线引脚可连可不连,
电源引脚一般不连。
针对地线和/或电源线连接的情况,此时,所述隔离器40需具备电源隔离功能和信号隔离功能。
针对地线和电源线不连接的情况,此时,所述隔离器40具备信号隔离功能。
针对RS485接口的情况。
RS485接口有两种定义,图10的第一种定义中包括4个数据传输引脚(TDA-/Y、TDB+/Z、RDA-/A、RDB+/B)和一个地线引脚GND。地线引脚通常是不连的。此时,所述隔离器40需具备信号隔离功能。
图11的第二种定义中,RS485接口包括两个数据传输引脚(Data-/B/485-、Data+/A/485+)、一个地线引脚GND和一个电源线引脚(+9V)。地线引脚和电源线引脚通常是不连的,此时,所述隔离器40需具备信号隔离功能。
优选,所述第一接口和所述第二接口为基于I2C协议的接口。
如图12所示,I2C总线在物理连接上非常简单,分别由SDA(串行数据线)和SCL(串行时钟线)及上拉电阻组成。通信原理是通过对SCL和SDA线高低电平时序的控制,来产生I2C总线协议所需要的信号进行数据的传递。在总线空闲状态时,这两根线一般被上面所接的上拉电阻拉高,保持着高电平,总线上并接的每一模块电路既是主控器(主控器必须是带有CPU逻辑模块)(或被控器),又是发送器(或接收器),但***中的主机只有一个,时钟信号由主机产生。
由图12可见,此时,所述隔离器40需具备信号隔离功能。
优选地,如图13所示,所述电容屏智能平板100还包括AD转换模块50;所述电容屏20通过电容屏接收线21及电容屏输出线22与所述电容屏控制板13连接,所述AD转换模块40连接于所述电容屏接收线21上。
如图3所示,图3示出的RX1、RX2、RX3为所述电容屏接收线21的一部
分,所述电容屏接收线21用于将所述电容屏20检测到的触摸信号(模拟信号)发送给所述电容屏控制板13,所述电容屏控制板13根据所述触摸信号生成触摸坐标信息,并将所述触摸坐标信息发送给所述TV主板12,由所述TV主板12将所述触摸坐标信息转换成触摸坐标值,并发送给外接设备60(如PC模块或者安卓模块),所述外接设备60根据所述触摸坐标值进行响应,并将响应后生成的图像信息发送给TV主板12,所述TV主板12将所述图像信号及驱屏指令发送给所述液晶显示屏驱动板14,所述液晶显示屏驱动板14根据所述驱屏指令驱动所述液晶显示面板30,并由显示器最终显示所述图像信息。
在实际情况中,在智能平板内,特别是大尺寸的智能平板内,由于布线的需要,所述电容屏接收线21可能会比较长,这就会导致在所述电容屏接收线21内传输的信号受到较大的干扰,特别地,当传输的信号为模拟信号,其受干扰后会产生失真和叠加杂波,而这种失真和叠加杂波很难消除及恢复,因此就可能导致触摸坐标信息不准确,导致最后的触摸位置判断不准确。
为此,在本发明实施例中,在每一所述电容屏接收线21增加了所述AD转换模块50,所述AD转换模块50可将模拟信号转换为数字信号,虽然数字信号在传输过程中也会存在因干扰而产生误码的问题,但是这种误码可以通过事先的抗干扰编码加以消除,因此可保证触摸坐标信息的准确性,提高触摸位置判断的准确度。
优选地,所述AD转换模块50设置于所述电容屏接收线21的与所述电容屏20连接的一端。
在本优选实施例中,所述AD转换模块50设置于所述电容屏接收线21的与所述电容屏20连接的一端,即在模拟信号刚生成获刚在所述电容屏接收线21传输时就将其转换为数字信号,因而可最大限度的减轻模拟信号受干扰后难以恢复的问题,提高了触摸点判断的准确度。
当前,应当理解的是,所述AD转换模块50也可设置于所述电容屏接收线21的靠近于所述电容屏20连接的一端,本发明不做具体限定。
优选地,所述整机10还包括整机背板,所述电容屏控制板13挂设于所述
整机背板上;所述电容屏接收线21及所述电容屏输出线22从所述电容屏控制板13引出,并沿所述整机背板的内壁走线后连接至所述电容屏;其中,所述电容屏接收线21及所述电容屏输出线22具有导体层、包裹所述导体层的第一绝缘层及包裹所述第一绝缘层的屏蔽层,所述屏蔽层与所述整机背板的内壁之间进行绝缘处理。
在本实施例中,所述整机背板由金属材料制成,其一方面起固定支撑作用,所述TV电路板12、所述电容屏控制板13及各种电路板盖子都固定在整机背板上。另一方面,如前面所述,所述整机背板也是整机10上最大的地,电路意义上的地。现有技术中,所述电容屏接收线21及所述电容触摸屏发射线24紧贴所述整机背板的内壁平行走线,在工作过程中,整机背板可能会受到所述液晶显示面板30干扰,且所述整机背板被干扰后将产生空间辐射,这些空间辐射会干扰在所述电容屏接收线21及所述电容屏输出线22内传输的信号。
为此,请一并参阅图14,以所述电容屏接收线21为例,在本实施例中,所述电容屏接收线21具有导体层211、包裹所述导体层211的第一绝缘层212及包裹所述第一绝缘层212的屏蔽层213,所述屏蔽层213与所述整机背板之间进行绝缘处理。
在本实施例中,所述导体层211用于进行信号的传输,所述第一绝缘层212起到对所述导体层211进行绝缘的作用,所述屏蔽层213可为金属屏蔽层,其可屏蔽整机背板的空间辐射对所述导体层211内传输的信号的干扰。由于所述屏蔽层233为金属屏蔽层,因此还需要对所述屏蔽层213进行绝缘处理。
具体地,可以在所述屏蔽层213外设置包裹所述屏蔽层213的第二绝缘层214,也可以在所述屏蔽层213与所述整机背板之间垫绝缘垫块,使得所述屏蔽层213与所述整机背板在物理上分离,还可以在所述整机背板与所述屏蔽层213接触的部分贴绝缘胶布进行绝缘,其中,较佳地,可在所述屏蔽层213外设置包裹所述屏蔽层213的第二绝缘层214,已达到较好的绝缘效果。
同理,所述电容屏输出线22也进行相似的绝缘处理,本发明在此不做赘述。
优选地,所述智能平板100还包括电源隔离器70,所述电源11通过所述电源隔离器70与所述电容屏控制板13连接。
在一些情况下,所述电容屏控制板13无法由所述TV主板12直接通过接口供电。例如,接口的引脚不包含电源引脚或者电源引脚不相连或者接口的引脚包含电源引脚,但提供的电源不足以驱动所述电容屏控制板13工作。特别地,针对大尺寸的电容屏智能平板,即使接口有电源引脚,通过电源引脚提供的电源往往不足以驱动所述电容屏控制板13。
为此,如图15所示,在本优选实施例中,所述电容屏控制板13由所述电源11直接供电,则此时,在所述电源11与所述电容屏控制板13之间连接有电源隔离器70,用于实现所述电源11与所述电容屏控制板13之间的电源隔离,从而电源11、TV主板12的接地与所述电容屏20的接地不再连接,避免了所述整机10的接地端受到的接地干扰影响到所述电容屏20的接地端。
需要说明的是,类似地,所述液晶屏驱动板14也有两种供电方式,针对较小尺寸的智能平板,所述液晶屏驱动板14可通过所述TV主板12供电,而针对大尺寸的智能平板,所述液晶屏驱动板14需由所述电源11供电。以上所揭露的仅为本发明一些较佳实施例而已,当然不能以此来限定本发明之权利范围,本领域普通技术人员可以理解实现上述实施例的全部或部分流程,并依本发明权利要求所作的等同变化,仍属于发明所涵盖的范围。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程,是可以通过计算机程序来指令相关的硬件来完成,所述的程序可存储于一计算机可读取存储介质中,该程序在执行时,可包括如上述各方法的实施例的流程。其中,所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory,ROM)或随机存储记忆体(Random Access Memory,RAM)等。
Claims (16)
- 一种电容屏智能平板,其特征在于,包括:整机、电容屏、液晶显示面板及隔离器,所述液晶显示面板设置于所述整机与所述电容屏之间;其中,所述整机包括电源、TV主板、电容屏控制板及液晶屏驱动板;所述电源与所述TV主板连接;所述液晶屏驱动板与所述液晶显示面板及所述TV主板连接,所述电容屏控制板与所述电容屏连接;所述电容屏控制板具有第一接口,所述TV主板具有第二接口,所述第一接口与所述第二接口通过所述隔离器连接。
- 根据权利要求1所述的电容屏智能平板,其特征在于,所述隔离器具有信号隔离功能。
- 根据权利要求1所述的电容屏智能平板,其特征在于,所述隔离器同时具有电源隔离功能和信号隔离功能。
- 根据权利要求1至3任意一项所述的电容屏智能平板,其特征在于,所述第一接口及所述第二接口为USB接口,所述隔离器为USB隔离器。
- 根据权利要求4所述的电容屏智能平板,其特征在于,所述第一接口和所述第二接口为USB2.0接口。
- 根据权利要求4所述的电容屏智能平板,其特征在于,所述第一接口和所述第二接口为USB3.0接口。
- 根据权利要求1至3任意一项所述的电容屏智能平板,其特征在于,所 述第一接口和所述第二接口为基于VB1协议的接口。
- 根据权利要求1至3任意一项所述的电容屏智能平板,其特征在于,所述第一接口和所述第二接口为基于UART协议的接口。
- 根据权利要求1至3任意一项所述的电容屏智能平板,其特征在于,所述第一接口和所述第二接口为基于SPI协议的接口。
- 根据权利要求1至3任意一项所述的电容屏智能平板,其特征在于,所述第一接口和所述第二接口为COM口。
- 根据权利要求1至3任意一项所述的电容屏智能平板,其特征在于,所述第一接口和所述第二接口为基于I2C协议的接口。
- 根据权利要求1所述的电容屏智能平板,其特征在于,所述电容屏智能平板还包括AD转换模块;所述电容屏通过电容屏接收线及电容屏输出线与所述电容屏控制板连接,所述AD转换模块连接于所述电容屏接收线上。
- 根据权利要求12所述的电容屏智能平板,其特征在于,所述AD转换模块设置于所述电容屏接收线的与所述电容屏连接的一端。
- 根据权利要求12所述的电容屏智能平板,其特征在于,所述整机还包括整机背板,所述电容屏控制板挂设于所述整机背板上;所述电容屏接收线及所述电容屏输出线从所述电容屏控制板引出,并沿所述整机背板的内壁走线后连接至所述电容屏本体;其中,所述电容接收线及所述电容输出线具有导体层、 包裹所述导体层的第一绝缘层及包裹所述第一绝缘层的屏蔽层,所述屏蔽层与所述整机背板的内壁之间进行绝缘处理。
- 根据权利要求14所述的电容屏智能平板,其特征在于,所述屏蔽层外设置有包裹所述屏蔽层的第二绝缘层;或者所述屏蔽层与所述整机背板的内壁之间垫有绝缘垫块;或者所述整机背板的内壁与所述屏蔽层接触的部分贴有绝缘胶布。
- 根据权利要求1、12至15任意一项所述的电容屏智能平板,其特征在于,还包括电源隔离器,所述电源通过所述电源隔离器与所述电容屏控制板连接。
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CN206863720U (zh) * | 2017-05-26 | 2018-01-09 | 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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