Dot matrix liquid crystal anti-interference structure, drive-by-wire controller and display device

Abstract

The application discloses a dot matrix liquid crystal anti-interference structure, a line controller and display equipment, a communication control circuit is arranged between an MCU and a dot matrix liquid crystal, when the MCU sends data to the dot matrix liquid crystal, the communication control circuit sends the data of the MCU to the dot matrix liquid crystal; when the MCU does not send data to the dot matrix liquid crystal, the communication control circuit cannot send the data of the MCU to the dot matrix liquid crystal. In this way, when the MCU does not send data to the dot matrix liquid crystal, the communication line between the MCU and the dot matrix liquid crystal is disconnected, and interference data generated due to the environment cannot reach the dot matrix liquid crystal through the communication line between the MCU and the dot matrix liquid crystal, so that the problems of liquid crystal mura, screen jumping and white screen are not caused. Moreover, since the time of not sending data is far greater than the time of sending data, the possibility of liquid crystal damage can be greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of dot-matrix liquid crystal anti-interference, and in particular, to a dot-matrix liquid crystal anti-interference structure, a wired controller, and a display device. Background Technology

[0002] Currently, air conditioner remote controllers have increasingly diverse functional requirements, such as QR code display and dynamic icon refresh. Conventional segmented LCDs can no longer meet these needs, so dot-matrix LCDs are chosen to implement these functions. Dot-matrix LCDs require IC drivers, and the communication between the LCD and the MCU on the motherboard is mostly via I2C, SPI, or 8080. In environments with significant interference, the interference can affect the LCD through the communication lines, causing problems such as screen flickering, screen skipping, and white screens. Prolonged operation in highly turbulent environments can damage the LCD. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a dot matrix liquid crystal anti-interference structure, a wired controller and a display device, to solve the problems that when there is a lot of environmental interference, the interference generated by the environment will affect the liquid crystal through the communication line, resulting in problems such as screen distortion, screen jumping and white screen, and the liquid crystal will be damaged when working in a highly interference environment for a long time.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] In a first aspect, a dot matrix liquid crystal anti-interference structure is provided, including an MCU and a dot matrix liquid crystal, wherein the MCU is used to send data to the dot matrix liquid crystal;

[0006] A communication control circuit is provided between the MCU and the dot matrix liquid crystal;

[0007] When the MCU sends data to the dot matrix liquid crystal, the communication control circuit sends the data from the MCU to the dot matrix liquid crystal.

[0008] When the MCU does not send data to the dot matrix liquid crystal, the communication control circuit cannot send the MCU's data to the dot matrix liquid crystal.

[0009] Furthermore, the communication control circuit is unable to send data from the MCU to the dot matrix liquid crystal, including: the MCU using the communication control circuit to make the communication line between the MCU and the dot matrix liquid crystal present a high impedance state.

[0010] Furthermore, the communication control circuit includes a data input interface, a data output interface, and an enable interface;

[0011] The data input interface is connected to the MCU and is used to receive communication data sent by the MCU;

[0012] The data output interface is connected to the dot matrix liquid crystal and is used to send the communication data received by the data input interface to the dot matrix liquid crystal.

[0013] The enable interface is connected to the MCU and is used to receive the enable signal from the MCU, so as to control whether the communication line between the MCU and the dot matrix liquid crystal presents a high impedance state according to the enable signal.

[0014] Furthermore, the enable interface is connected to the base of the first transistor, the emitter of the first transistor is grounded, the collector of the first transistor is connected to the power supply through a first resistor, the collector of the first transistor is also connected to the anode of the first diode, the cathode of the first diode is grounded through a second resistor, the data input interface is connected to the anode of the second diode, the cathode of the second diode is connected to the cathode of the first diode, the cathode of the first diode is also connected to the base of the second transistor through a third resistor, the emitter of the second transistor is grounded, the collector of the second transistor is connected to the power supply through a fourth resistor, the collector of the first transistor is connected to the anode of the third diode, and the cathode of the third diode is grounded through a fifth resistor. The collector of the second transistor is connected to the positive terminal of the fourth diode, the negative terminal of the fourth diode is connected to the negative terminal of the third diode, the negative terminal of the third diode is connected to the base of the third transistor through a sixth resistor, the emitter of the third transistor is grounded, the collector of the third transistor is connected to the power supply through a seventh resistor, the collector of the third transistor is connected to the gate of the first MOSFET, the collector of the second transistor is connected to the gate of the second MOSFET, the drain of the first MOSFET is connected to the power supply through an eighth resistor, the source of the first MOSFET is connected to the drain of the second MOSFET, the source of the second MOSFET is grounded through a ninth resistor, and the data output interface is connected to the source of the first MOSFET.

[0015] Furthermore, the first transistor and / or the second transistor and / or the third transistor are NPN transistors.

[0016] Furthermore, the first MOSFET and / or the second MOSFET are N-type MOSFETs.

[0017] Furthermore, the communication control circuit is a switch, and the communication control circuit cannot send data from the MCU to the dot matrix liquid crystal, including: the MCU disconnecting the communication line between the MCU and the dot matrix liquid crystal through the communication control circuit.

[0018] Furthermore, the switch is a relay. When the MCU sends data to the dot matrix liquid crystal, the MCU controls the relay to close, and the communication line between the MCU and the dot matrix liquid crystal is connected.

[0019] When the MCU does not send data to the dot matrix liquid crystal, the MCU controls the relay to disconnect, and the communication line between the MCU and the dot matrix liquid crystal is disconnected.

[0020] In a second aspect, a wired controller is provided, comprising the structure described in any one of the technical solutions provided in the first aspect.

[0021] Thirdly, a display device is provided, comprising the structure described in any one of the technical solutions provided in the first aspect.

[0022] Beneficial effects:

[0023] This application provides a dot-matrix LCD anti-interference structure, a wired controller, and a display device. A communication control circuit is set between the MCU and the dot-matrix LCD. When the MCU sends data to the dot-matrix LCD, the communication control circuit sends the MCU's data to the dot-matrix LCD; when the MCU does not send data to the dot-matrix LCD, the communication control circuit cannot send the MCU's data to the dot-matrix LCD. Thus, when the MCU is not sending data to the dot-matrix LCD, the communication line between the MCU and the dot-matrix LCD is disconnected. Interference data generated by the environment cannot reach the dot-matrix LCD through the communication line between the MCU and the dot-matrix LCD, thus preventing problems such as screen flickering, screen skipping, and white screen. Moreover, since the time without data transmission is much longer than the time with data transmission, the possibility of LCD damage can be greatly reduced. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a dot matrix liquid crystal anti-interference structure provided in an embodiment of the present invention;

[0026] Figure 2 This is a circuit diagram of a communication control circuit provided in an embodiment of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] It should be noted that the existing MCU is directly connected to the dot-matrix LCD. When the MCU needs to send data, data transmission occurs directly through the communication line between the MCU and the dot-matrix LCD. When there is significant interference in the external environment, the MCU will generate electromagnetic interference, which will affect the display of the dot-matrix LCD through the communication line. Since the communication line between the MCU and the dot-matrix LCD is always connected, any electromagnetic interference will affect the dot-matrix LCD. Therefore, this electromagnetic interference may occur during data transmission or during idle periods, but in actual use, the idle time is much longer than the data transmission time.

[0029] The first embodiment, referred to Figure 1 This invention provides a dot matrix liquid crystal anti-interference structure, including an MCU and a dot matrix liquid crystal, wherein the MCU is used to send data to the dot matrix liquid crystal;

[0030] A communication control circuit is provided between the MCU and the dot matrix LCD;

[0031] When the MCU sends data to the dot matrix LCD, the communication control circuit sends the MCU's data to the dot matrix LCD.

[0032] When the MCU does not send data to the dot matrix LCD, the communication control circuit cannot send the MCU's data to the dot matrix LCD.

[0033] The anti-interference structure for dot-matrix liquid crystal provided in this invention includes a communication control circuit between the MCU and the dot-matrix liquid crystal. When the MCU sends data to the dot-matrix liquid crystal, the communication control circuit sends the MCU's data to the dot-matrix liquid crystal; when the MCU does not send data to the dot-matrix liquid crystal, the communication control circuit cannot send the MCU's data to the dot-matrix liquid crystal. Thus, when the MCU is not sending data to the dot-matrix liquid crystal, the communication line between the MCU and the dot-matrix liquid crystal is disconnected, and interference data generated by the environment cannot reach the dot-matrix liquid crystal through the communication line between the MCU and the dot-matrix liquid crystal, thereby preventing problems such as screen flickering, screen skipping, and white screen. Furthermore, since the time without data transmission is much longer than the time with data transmission, the possibility of liquid crystal damage can be greatly reduced.

[0034] In a second embodiment, the present invention provides a specific dot matrix liquid crystal anti-interference structure, including an MCU and a dot matrix liquid crystal, wherein the MCU is used to send data to the dot matrix liquid crystal;

[0035] A communication control circuit is provided between the MCU and the dot matrix LCD;

[0036] When the MCU sends data to the dot matrix LCD, the communication control circuit sends the MCU's data to the dot matrix LCD.

[0037] When the MCU does not send data to the dot matrix LCD, the MCU uses a communication control circuit to make the communication line between the MCU and the dot matrix LCD present a high impedance state.

[0038] like Figure 2 As shown, the communication control circuit includes a data input interface SIG-IN, a data output interface SIG-OUT, and an enable interface EN. The data input interface SIG-IN is connected to the MCU and is used to receive communication data sent by the MCU. The data output interface SIG-OUT is connected to the dot matrix LCD and is used to send the communication data received by the data input interface SIG-IN to the dot matrix LCD. The enable interface EN is connected to the MCU and is used to receive the enable signal from the MCU, so as to control whether the communication line between the MCU and the dot matrix LCD presents a high impedance state according to the enable signal.

[0039] The enable interface EN is connected to the base of the first transistor Q1, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is connected to the power supply through the first resistor R1, the collector of the first transistor Q1 is also connected to the anode of the first diode D1, and the cathode of the first diode D1 is grounded through the second resistor R2. The data input interface SIG-IN is connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to the cathode of the first diode D1, the cathode of the first diode D1 is also connected to the base of the second transistor Q2 through the third resistor R3, the emitter of the second transistor Q2 is grounded, the collector of the second transistor Q2 is connected to the power supply through the fourth resistor R4, the collector of the first transistor Q1 is connected to the anode of the third diode D3, and the cathode of the third diode D3 is connected to the power supply through the fifth resistor R5. The transistor is grounded. The collector of the second transistor Q2 is connected to the positive terminal of the fourth diode D4. The negative terminal of the fourth diode D4 is connected to the negative terminal of the third diode D3. The negative terminal of the third diode D3 is connected to the base of the third transistor Q3 through the sixth resistor R6. The emitter of the third transistor Q3 is grounded. The collector of the third transistor Q3 is connected to the power supply through the seventh resistor R7. The collector of the third transistor Q3 is connected to the gate of the first MOSFET T1. The collector of the second transistor Q2 is connected to the gate of the second MOSFET T2. The drain of the first MOSFET is connected to the power supply through the eighth resistor R8. The source of the first MOSFET T1 is connected to the drain of the second MOSFET T2. The source of the second MOSFET T2 is grounded through the ninth resistor R9. The data output interface SIG-OUT is connected to the source of the first MOSFET T1.

[0040] Among them, the first transistor Q1, the second transistor Q2, and the third transistor Q3 are NPN transistors. The first MOSFET T1 and the second MOSFET T2 are N-type MOSFETs.

[0041] The control process is as follows:

[0042] When the MCU sends an enable signal (EN=1), the communication control circuit receives the enable signal through the enable interface EN. The first transistor Q1 turns on, and its collector is pulled low. The first diode D1 and the third diode D3 do not conduct. If the signal at the data input interface SIG-IN is high at this time, the second diode D2 turns on, and the second transistor Q2 turns on, pulling its collector low. Therefore, the fourth diode D4 does not conduct. Since the third diode D3 and the fourth diode D4 are not conducting, the third transistor Q3 does not conduct. The first MOSFET T1 turns on. The gate of the second MOSFET T2 is at the same level as the collector of the second transistor Q2, therefore the second MOSFET T2 does not conduct. Thus, the data output interface SIG-IN... The output signal of G-OUT is pulled up to a high level. If the signal of the data input interface SIG-IN is low, then the second diode D2 is not conducting, the second transistor Q2 is not conducting, the collector of the second transistor Q2 is pulled up to a high level, the fourth diode D4, the third transistor Q3, and the first MOSFET T1 are all not conducting, the gate of the second MOSFET T2 is at the same level as the collector of the second transistor Q2, therefore the second MOSFET T2 is conducting, and the output signal of the data output interface SIG-OUT is pulled down to a low level. In summary, if the MCU sends an enable signal (EN=1), if the transmitted data is high, the output data is high; if the transmitted data is low, the output data is low. That is, the MCU can communicate normally with the dot matrix LCD.

[0043] When the MCU disables the control circuit (EN=0), the first transistor Q1 is not turned on, and its collector is high. The first diode D1 and the third diode D3 are turned on. At this time, regardless of whether the second diode D2 and the fourth diode D4 are turned on, the second transistor Q2 and the third transistor Q3 will be turned on, and their collectors will be pulled down to low. The first MOSFET T1 and the second MOSFET T2 cannot be turned on. Therefore, regardless of the state of the SIG-IN signal at the data input interface, the SIG-OUT signal at the data output interface will always be in a high-impedance state. This means the dot-matrix LCD cannot receive any data sent by the MCU. However, since the data displayed on the LCD is actively sent by the MCU, the MCU can automatically switch EN based on whether it is sending data to the LCD.

[0044] The specific anti-interference structure for dot-matrix liquid crystal provided in this embodiment of the invention is controlled by an enable signal EN issued by the MCU. When the MCU issues an enable signal (EN=1), the communication control circuit connects the communication line between the MCU and the dot-matrix liquid crystal, allowing normal communication between the dot-matrix liquid crystal and the MCU. When the MCU does not enable the control circuit (EN=0), the control circuit disconnects the communication line between the MCU and the dot-matrix liquid crystal, resulting in a high-impedance state. Interference data generated at the MCU will not affect the dot-matrix liquid crystal. This embodiment of the invention adds a communication control circuit to the communication line between the dot-matrix liquid crystal and the MCU. This circuit connects the communication line when the MCU sends data and disconnects it when not sending data, keeping the communication line in a high-impedance state and improving the anti-interference capability of the dot-matrix liquid crystal.

[0045] The third embodiment, as a supplement to the first embodiment, describes a communication control circuit that is a switch. In the first embodiment, the communication control circuit cannot send data from the MCU to the dot-matrix LCD. This includes the MCU disconnecting the communication line between the MCU and the dot-matrix LCD via the communication control circuit. Specifically, the switch is a relay. When the MCU sends data to the dot-matrix LCD, the MCU controls the relay to close, connecting the communication line between the MCU and the dot-matrix LCD. When the MCU does not send data to the dot-matrix LCD, the MCU controls the relay to open, disconnecting the communication line between the MCU and the dot-matrix LCD.

[0046] It should be noted that existing relays are generally large in size, therefore the structure provided in this embodiment of the invention is applied to large devices with dot matrix liquid crystals.

[0047] The structure provided in this embodiment of the invention enables the MCU to control the relay to disconnect when the MCU does not send data to the dot matrix liquid crystal. This disconnects the communication line between the MCU and the dot matrix liquid crystal, preventing interference data generated at the MCU from being sent to the dot matrix liquid crystal and reducing the possibility of damage to the dot matrix liquid crystal.

[0048] In the fourth embodiment, the present invention provides a wired controller, including the structure of the first or second embodiment. It will not cause problems such as LCD screen flickering, screen skipping, or white screen. Furthermore, since the time spent not sending data is much longer than the time spent sending data, the possibility of LCD damage can be greatly reduced.

[0049] It should be noted that wired controllers are generally smaller in size, while relays are larger; therefore, the solution of the third embodiment is generally not used in wired controllers. However, if the size of the relay is within the allowable range for the wired controller, the wired controller provided in this embodiment can also adopt the structure of the third embodiment.

[0050] In the fifth embodiment, the present invention provides a display device, including the structure of the first, second, or third embodiment. It will not cause problems such as LCD screen flickering, screen skipping, or white screen. Furthermore, since the time without data transmission is much longer than the time with data transmission, the possibility of LCD damage can be greatly reduced.

[0051] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0052] It should be noted that in the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means at least two.

[0053] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0054] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0055] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0056] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0057] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0059] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A dot-matrix liquid crystal anti-interference structure, characterized in that, It includes an MCU and a dot matrix liquid crystal, wherein the MCU is used to send data to the dot matrix liquid crystal; A communication control circuit is provided between the MCU and the dot matrix liquid crystal; When the MCU sends data to the dot matrix liquid crystal, the communication control circuit sends the data from the MCU to the dot matrix liquid crystal. When the MCU does not send data to the dot matrix liquid crystal, the communication control circuit cannot send the data from the MCU to the dot matrix liquid crystal. The communication control circuit includes a data input interface, a data output interface, and an enable interface. The data input interface is connected to the MCU and is used to receive communication data sent by the MCU; The data output interface is connected to the dot matrix liquid crystal and is used to send the communication data received by the data input interface to the dot matrix liquid crystal. The enable interface is connected to the MCU and is used to receive the enable signal of the MCU, so as to control whether the communication line between the MCU and the dot matrix liquid crystal presents a high impedance state according to the enable signal. The enable interface is connected to the base of the first transistor, the emitter of the first transistor is grounded, the collector of the first transistor is connected to the power supply through a first resistor, the collector of the first transistor is also connected to the anode of the first diode, the cathode of the first diode is grounded through a second resistor, the data input interface is connected to the anode of the second diode, the cathode of the second diode is connected to the cathode of the first diode, the cathode of the first diode is also connected to the base of the second transistor through a third resistor, the emitter of the second transistor is grounded, the collector of the second diode is connected to the power supply through a fourth resistor, the collector of the first transistor is connected to the anode of the third diode, and the cathode of the third diode is grounded through a fifth resistor. The collector of the second transistor is connected to the positive terminal of the fourth diode, the negative terminal of the fourth diode is connected to the negative terminal of the third diode, the negative terminal of the third diode is connected to the base of the third transistor through a sixth resistor, the emitter of the third transistor is grounded, the collector of the third transistor is connected to the power supply through a seventh resistor, the collector of the third transistor is connected to the gate of the first MOSFET, the collector of the second transistor is connected to the gate of the second MOSFET, the drain of the first MOSFET is connected to the power supply through an eighth resistor, the source of the first MOSFET is connected to the drain of the second MOSFET, the source of the second MOSFET is grounded through a ninth resistor, and the data output interface is connected to the source of the first MOSFET.

2. The structure according to claim 1, characterized in that: The communication control circuit is unable to send data from the MCU to the dot matrix liquid crystal, including: the MCU using the communication control circuit to make the communication line between the MCU and the dot matrix liquid crystal present a high impedance state.

3. The structure according to claim 2, characterized in that: The first transistor and / or the second transistor and / or the third transistor are NPN transistors.

4. The structure according to claim 3, characterized in that: The first MOSFET and / or the second MOSFET are N-type MOSFETs.

5. The structure according to claim 1, characterized in that: The communication control circuit is a switch. When the communication control circuit cannot send data from the MCU to the dot matrix liquid crystal, it includes: the MCU disconnecting the communication line between the MCU and the dot matrix liquid crystal through the communication control circuit.

6. The structure according to claim 5, characterized in that: The switch is a relay. When the MCU sends data to the dot matrix liquid crystal, the MCU controls the relay to close, and the communication line between the MCU and the dot matrix liquid crystal is connected. When the MCU does not send data to the dot matrix liquid crystal, the MCU controls the relay to disconnect, and the communication line between the MCU and the dot matrix liquid crystal is disconnected.

7. A wired controller, characterized in that: Includes the structure as described in any one of claims 1-6.

8. A display device, characterized in that: Includes the structure as described in any one of claims 1-6.

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