Mining vehicle-mounted display screen control circuit, display screen device and vehicle

Abstract

The invention discloses a mining vehicle-mounted display screen control circuit, a display screen device and a vehicle. The mining vehicle-mounted display screen control circuit comprises a deserializing module, a backlight driving module, a liquid crystal driving module and a key conversion module, the deserializing module is connected with the host and is used for deserializing serial signals output by the host and outputting a first deserializing signal, a second deserializing signal, a third deserializing signal and a fourth deserializing signal; the backlight driving module is connected with the backlight source and the deserializing module, and the backlight driving module is used for adjusting the backlight source according to the first deserializing signal; the liquid crystal driving module is connected with the liquid crystal display screen and the deserializing module and used for driving the liquid crystal display screen according to the second deserializing signal; the key conversion module is connected with the key and the deserializing module, and the key conversion module is used for communicating with the key according to the third deserializing signal. The mining vehicle-mounted display screen control circuit provided by the invention adopts serial signal communication, and has the advantages of simple wiring and stable signal transmission.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit design, and in particular to a mining vehicle-mounted display screen control circuit, a display screen device and a vehicle. Background Art

[0002] In the mine, due to the small space and the presence of coal dust and harmful gases, traditional rail transportation methods can hardly meet the needs. Trackless rubber-tyred vehicles can flexibly adapt to underground spaces and reduce damage to coal seams. With the construction of intelligent trackless rubber-tyred vehicles, the number and functions of on-board cameras, sensors and other equipment are increasing. The on-board display is one of the important components of the entire on-board system. The smoothness, stability and response speed of the display directly affect the user's perception of the on-board system. The display screen generally includes an LCD panel, a touch panel, a drive circuit, a video processing chip, as well as function buttons and indicator lights. Due to the internal space limitations of the vehicle, the host that processes the video and sensor data is not integrated with the display screen and needs to be transmitted through cables.

[0003] At present, display screens generally transmit parallel high-speed data through HDMI (High Definition Multimedia Interface) / RGB interface / DSI (Display Serial Interface) / CSI (Camera SerialInterfac), etc., which require connectors with a large number of pins and large size, and the weight, quantity and cost of cables are relatively high. At the same time, there may be a significant shift in the transmission phase between multiple parallel data and between data and clock, causing transmission errors to the system. In addition, analog video display screens, such as CVBS (Composite Video Baseband Signal) / AHD (Analog High Definition), generally do not have touch functions, and touch signals need to be transmitted through separate cables, which also increases the difficulty and cost of wiring. The above-mentioned display screens have problems with data transmission interference and difficulty in wiring. Summary of the invention

[0004] The invention provides a mining vehicle-mounted display screen control circuit, a display screen device and a vehicle, so as to solve the problems of data transmission interference and great wiring difficulty of the display screen in the prior art.

[0005] According to one aspect of the present invention, a mining vehicle-mounted display screen control circuit is provided, comprising a deserialization module, a backlight driving module, a liquid crystal driving module and a key conversion module;

[0006] The deserialization module is connected to the host, and is used to deserialize the serial signal output by the host and output a first deserialization signal, a second deserialization signal, a third deserialization signal and a fourth deserialization signal;

[0007] The backlight driving module is connected to the backlight source and the deserialization module, and the backlight driving module is used to adjust the backlight source according to the first deserialization signal;

[0008] The liquid crystal driving module is connected to the liquid crystal display screen and the deserialization module, and the liquid crystal driving module is used to drive the liquid crystal display screen according to the second deserialization signal;

[0009] The key conversion module connects the key and the deserialization module, and the key conversion module is used to communicate with the key according to the third deserialization signal.

[0010] Optionally, the deserialization module includes a deserialization chip, an input end, a first output end, a second output end, a third output end and a fourth output end, the deserialization chip is connected to the host through the input end, the first output end outputs the first deserialization signal, the second output end outputs the second deserialization signal, the third output end outputs the third deserialization signal, and the fourth output end outputs the fourth deserialization signal, the deserialization chip is connected to the backlight driving module through the first output end, the deserialization chip is connected to the LCD driving module through the second output end, the deserialization chip is connected to the key conversion module through the third output end, and the deserialization chip is connected to the LCD display through the fourth output end.

[0011] Optionally, the backlight driving module includes a first driving chip, an input end of the first driving chip is connected to the deserialization module, an enable end of the first driving chip is connected to the deserialization module, an output end of the first driving chip is connected to the backlight source, and the first driving chip is used to drive the backlight source according to the first deserialization signal output by the deserialization module.

[0012] Optionally, the LCD driver module includes a second driver chip, a first output end, a second output end, a third output end and a fourth output end, the first output end, the second output end, the third output end and the fourth output end are connected to the LCD display, the enable end of the second driver chip is connected to the deserialization module, and the second driver chip is used to drive the LCD display according to the second deserialization signal output by the deserialization module.

[0013] Optionally, the key conversion module includes an input / output interface expansion chip, the input end of the input / output interface expansion chip is connected to the key, the communication end of the input / output interface expansion chip is connected to the deserialization module, and the input / output interface expansion chip is used to expand the number of keys connected.

[0014] Optionally, the mining vehicle-mounted display screen control circuit also includes a power conversion module, which is connected to the host, the deserialization module, the backlight driver module, the liquid crystal driver module and the key conversion module. The power conversion module is used to convert the output power of the host and provide power for the deserialization module, the backlight driver module, the liquid crystal driver module and the key conversion module.

[0015] Optionally, the power conversion module includes a first conversion unit, a second conversion unit and a third conversion unit, the input end of the first conversion unit is connected to the host, the first output end of the first conversion unit is connected to the LCD driving module, the input end of the second conversion unit is connected to the second output end of the first conversion unit, the output end of the second conversion unit is connected to the deserialization module, the input end of the third conversion unit is connected to the first output end of the first conversion unit, the output end of the third conversion unit is connected to the LCD display, the first conversion unit is used to convert the power signal output by the host into a first power signal and a second power signal, the second conversion unit is used to convert the second power signal into a third power signal, and the third conversion unit is used to convert the first power signal into a fourth power signal.

[0016] Optionally, the deserialization module is also connected to a touch screen, and the touch screen is used to communicate with the host according to a third deserialization signal output by the deserialization module.

[0017] According to another aspect of the present invention, a display screen device is provided, comprising the mining vehicle-mounted display screen control circuit.

[0018] According to another aspect of the present invention, a vehicle is provided, comprising the display screen device.

[0019] The technical solution of the embodiment of the present invention provides a mining vehicle-mounted display screen control circuit, which deserializes the serial signal output by the host by setting a deserialization module and outputs the first deserialization signal, the second deserialization signal, the third deserialization signal and the fourth deserialization signal, the backlight driving module adjusts the backlight source according to the first deserialization signal, the liquid crystal driving module drives the liquid crystal display according to the second deserialization signal, and the key conversion module communicates with the key according to the third deserialization signal. The mining vehicle-mounted display screen control circuit provided by the present invention deserializes the serial signal through the deserialization module, and the display screen adopts serial signal communication, and only four cables are needed to complete the data transmission of the display screen, the wiring is simple and the transmission signal is stable. The problem of data transmission interference and wiring difficulty of the display screen in the prior art is solved.

[0020] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a structural schematic diagram of a mining vehicle-mounted display screen control circuit provided by an embodiment of the present invention;

[0023] Figure 2 is a circuit diagram of a deserialization module provided in an embodiment of the present invention;

[0024] Figure 3 is a circuit diagram of a backlight driving module provided by an embodiment of the present invention;

[0025] Figure 4 is a circuit diagram of a liquid crystal drive module provided by an embodiment of the present invention;

[0026] Figure 5 is a circuit diagram of a key conversion module provided by an embodiment of the present invention;

[0027] Figure 6 It is a structural schematic diagram of another mining vehicle-mounted display screen control circuit provided by an embodiment of the present invention;

[0028] Figure 7 is a structural schematic diagram of a display device provided by an embodiment of the present invention;

[0029] Figure 8It is a structural schematic diagram of a vehicle provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] The embodiment of the present invention provides a mining vehicle-mounted display screen control circuit, Figure 1 Schematic diagram of a mining vehicle display screen control circuit provided by an embodiment of the present invention. Figure 1 As shown, the mining vehicle-mounted display screen control circuit 100 includes a deserialization module 110, a backlight driving module 120, a liquid crystal driving module 130 and a key conversion module 140; the deserialization module 110 is connected to the host, and the deserialization module 110 is used to deserialize the serial signal output by the host and output a first deserialization signal, a second deserialization signal, a third deserialization signal and a fourth deserialization signal; the backlight driving module 120 is connected to the backlight source and the deserialization module 110, and the backlight driving module 120 is used to adjust the backlight source according to the first deserialization signal; the liquid crystal driving module 130 is connected to the liquid crystal display screen and the deserialization module 110, and the liquid crystal driving module 130 is used to drive the liquid crystal display screen according to the second deserialization signal; the key conversion module 140 is connected to the key and the deserialization module 110, and the key conversion module 140 is used to communicate with the key according to the third deserialization signal.

[0033] In this embodiment, the mine vehicle display screen control circuit 100 is a circuit for processing host signals and controlling the transmission of display screen data signals. The mine vehicle display screen control circuit 100 can be set on the main control circuit board. The deserialization module 110 is a module for deserializing the input serial signal and outputting a parallel signal. For example, the deserialization module 110 includes a deserializer, which has the advantages of strong anti-interference ability and low power consumption. The backlight driving module 120 is a module for driving the backlight source according to the received deserialization signal, the liquid crystal driving module 130 is a module for driving the liquid crystal display according to the received deserialization signal, and the key conversion module 140 is a module for converting the input key command into a digital signal to realize the interaction between the key and the host.

[0034] Exemplarily, the host outputs an FPD-Link (Flat Panel Display Link) serial signal, the deserialization module 110 deserializes the FPD-Link serial signal and outputs a PWM signal (Pulse Width Modulation) (i.e., a first deserialization signal), a GPIO signal (General-purpose input / output) (i.e., a second deserialization signal), an I2C signal (Inter-Integrated Circui) (i.e., a third deserialization signal), and an LVDS (Low-Voltage Differential Signaling) (i.e., a fourth deserialization signal). The backlight driving module 120 adjusts the backlight source according to the first deserialization signal, the LCD driving module 130 drives the LCD display according to the second deserialization signal, the key conversion module 140 communicates with the key according to the third deserialization signal, and the fourth deserialization signal is transmitted to the LCD display. For example, the fourth deserialization signal transmits image data, etc.

[0035] The technical solution of this embodiment provides a mining vehicle-mounted display screen control circuit, which deserializes the serial signal output by the host by setting a deserialization module and outputs the first deserialization signal, the second deserialization signal, the third deserialization signal and the fourth deserialization signal, the backlight driving module adjusts the backlight source according to the first deserialization signal, the liquid crystal driving module drives the liquid crystal display according to the second deserialization signal, and the key conversion module communicates with the key according to the third deserialization signal. The mining vehicle-mounted display screen control circuit provided by this embodiment deserializes the serial signal through the deserialization module, and the display screen adopts serial signal communication, and only four cables are needed to complete the data transmission of the display screen, and the wiring is simple and the transmission signal is stable. It solves the problems of data transmission interference and wiring difficulty of the display screen in the prior art.

[0036] Figure 2 is a circuit diagram of a deserialization module provided in an embodiment of the present invention, such as Figure 2As shown, the deserialization module 110 includes a deserialization chip U1, an input end, a first output end, a second output end, a third output end and a fourth output end. The deserialization chip U1 is connected to the host through the input end, the first output end outputs a first deserialization signal, the second output end outputs a second deserialization signal, the third output end outputs a third deserialization signal, and the fourth output end outputs a fourth deserialization signal. The deserialization chip U1 is connected to the backlight driving module 120 through the first output end, the deserialization chip U1 is connected to the liquid crystal driving module 130 through the second output end, the deserialization chip U1 is connected to the key conversion module 140 through the third output end, and the deserialization chip U1 is connected to the liquid crystal display through the fourth output end.

[0037] In this embodiment, the output end of the host includes positive output ends DOUT+ and DOUT-, the output end of the host is connected to the input end of the deserialization module 110, and the deserialization module 110 deserializes the serial signal output by the host. The deserialization chip U1 includes pins RIN+ and RIN-, and the pins RIN+ and RIN- are respectively connected to the first end and the second end of the common mode filter M1 through the first capacitor C1 and the second capacitor C2, and the third end of the common mode filter M1 is connected to the positive output end DOUT+ of the host, and the fourth end of the common mode filter M1 is connected to the negative output end DOUT- of the host. The deserialization chip U1 also includes pin 12S_DC / GPIO2, and the pin 12S_DC / GPIO2 is connected to the first output end through the first resistor R1, and the first output end outputs a PWM signal. The deserialization chip U1 also includes pin 12S_WC / GPIO_REG7, and the pin 12S_WC / GPIO_REG7 is connected to the second output end through the second resistor R2, and the second output end outputs a GPIO signal. The deserialization chip U1 further includes a pin 12S_WC / GPIO_REG7, which is connected to a second output terminal through a second resistor R2, and the second output terminal outputs a GPIO signal. The deserialization chip U1 further includes a pin SDA and a pin SCL, which are connected to a third output terminal through a third resistor R3 and a fourth resistor R4, respectively, and the third output terminal outputs an I2C signal. The deserialization chip U1 also includes pin TXOUT-, pin TXOUT+, pin TXOUT1-, pin TXOUT1+, pin TXOUT2-, pin TXOUT2+, pin TXCLKOUT-, pin TXCLKOUT+, pin TXOUT3- and pin TXOUT3+, and the pin TXOUT-, pin TXOUT+, pin TXOUT1-, pin TXOUT1+, pin TXOUT2-, pin TXOUT2+, pin TXCLKOUT-, pin TXCLKOUT+, pin TXOUT3- and pin TXOUT3+ are respectively connected to the fourth output end through the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13 and the fourteenth resistor R14, and the fourth output end outputs the LVDS signal.

[0038] Based on the above embodiment, the deserialization chip U1 also includes pin PBD, pin CAP12S, pin 12S_DB / GPIO_REG5, pin VDDIO, pin 12S_DA / GPIO_REG6, pin B1STEN, pin MCLK, pin IDX, pin GPIO0, pin GPIO1, pin CAPLV25, pin MAPSEL, pin CAPLV12, pin OEN, pin VDD33_B, pin IFMODE, pin CAPL12, pin RES0, pin OSS_SEL, pin 12S_DD / GPIO3, pin 12S_CLK / GPIO_REG8, pin VDD33_A, pin RES1, pin CMF, pin BISTC / INTB_IN, pin CMLOUTNP, pin CMLOUTN, pin CAPR12, pin CAPP12, pin MODE_SEL and pin GND. The deserialization module 110 also includes a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-first capacitor C21, a twenty-second capacitor C22, a twenty-third capacitor C23, a twenty-fourth capacitor C24, a twenty-fifth capacitor C25, a twenty-sixth capacitor C26, a twenty-seventh capacitor C27, a twenty-eighth capacitor C28, a twenty-ninth capacitor C29, and a thirtieth capacitor C30. The deserialization module 110 also includes a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirtieth resistor R30, a thirty-first resistor R31, a thirty-second resistor R32, a thirty-third resistor R33, a thirty-fourth resistor R34, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a thirty-seventh resistor R37, a thirty-eighth resistor R38, a thirty-ninth resistor R39, a fortieth resistor R40, a forty-first resistor R41, and a forty-second resistor R42.

[0039] Figure 3 is a circuit diagram of a backlight driving module provided by an embodiment of the present invention, such as Figure 3As shown, the backlight driving module 120 includes a first driving chip U2, the input end of the first driving chip U2 is connected to the deserialization module 110, the enable end of the first driving chip U2 is connected to the deserialization module 110, and the output end of the first driving chip U2 is connected to the backlight source. The first driving chip U2 is used to drive the backlight source according to the first deserialization signal output by the deserialization module 110.

[0040] In this embodiment, the first driver chip U2 includes pin SD, pin VSENSE_N, pin VIN, pin LDO, pin FSET, pin PWM, pin VDDIO / EN, pin PGND, pin GND, pin GND_EP, pin ISET, pin TSENSE, pin TEST, pin OUT1, pin OUT2, pin OUT3, pin OUT4, pin BF and pin SW. Among them, the deserialization chip U1 outputs a PWM signal which is divided by the forty-third resistor R43 and the forty-fourth resistor R44 and then input to the pin PWM of the first driver chip U2. Figure 2 , the pin GPIO1 of the deserialization chip U1 outputs the enable signal BL PWR signal which is input to the pin VDDIO / EN of the first driving chip U2. The backlight driving module 120 further includes a 45th resistor R45, a 46th resistor R46, a 47th resistor R47, a 48th resistor R48, a 49th resistor R49, a 50th resistor R50, a 51st resistor R51, a 52nd resistor R52, a 53rd resistor R53, a 54th resistor R54, a 55th resistor R55, a 31st capacitor C31, a 32nd capacitor C32, a 33rd capacitor C33, a 34th capacitor C34, a 35th capacitor C35, a 36th capacitor C36, a 37th capacitor C37, a 38th capacitor C38, a 39th capacitor C39, a 40th capacitor C40, a 41st capacitor C41, a first transistor Q1, a first inductor L1, a first diode D1, a second diode D2, a third diode D3 and a first fuse F1, wherein the second diode D2 and the third diode D3 are voltage stabilizing diodes. The backlight driving module 120 is connected to the power supply V0, which is the power signal output by the host. The pin FB of the first driving chip U2 is connected to the positive pole LCD_LED_V+ of the backlight source. The pins OUT1, OUT2, OUT3 and OUT4 of the first driving chip U2 are connected to the negative pole LCD_LED_V- of the backlight source. The first driving chip U2 adjusts the brightness of the backlight source according to the duty cycle of the PWM signal output by the deserialization chip U1.

[0041] Figure 4 is a circuit diagram of a liquid crystal driving module provided by an embodiment of the present invention, such as Figure 4As shown, the liquid crystal driving module 130 includes a second driving chip U3, a first output terminal VGL, a second output terminal VGH, a third output terminal AVDD and a fourth output terminal VCOM, the first output terminal VGL, the second output terminal VGH, the third output terminal AVDD and the fourth output terminal VCOM are connected to the liquid crystal display, the enable terminal EN of the second driving chip U3 is connected to the deserialization module, and the second driving chip U3 is used to drive the liquid crystal display according to the second deserialization signal output by the deserialization module 110.

[0042] The liquid crystal driving module 130 further includes a fifty-sixth resistor R56, a fifty-seventh resistor R57, a fifty-eighth resistor R58, a fifty-ninth resistor R59, a sixtieth resistor R60, a sixty-first resistor R61, a sixty-second resistor R62, a sixty-third resistor R63, a sixty-fourth resistor R64, a sixty-fifth resistor R65, a sixty-sixth resistor R66, a sixty-seventh resistor R67, a sixty-eighth resistor R68, a sixty-ninth resistor R69, a seventy-first resistor R70, a seventy-first resistor R71, a seventy-second resistor R72, a seventy-third resistor R73, a forty-second capacitor C42, a forty-third capacitor C43, a forty-fourth capacitor C44, a forty-fifth capacitor C45, a forty-sixth capacitor C46, ​​a forty-seventh capacitor C47, a forty-seventh capacitor C48, a forty-eighth capacitor C49, a The eighth capacitor C48, the forty-ninth capacitor C49, the fiftieth capacitor C50, the fifty-first capacitor C51, the fifty-second capacitor C52, the fifty-third capacitor C53, the fifty-fourth capacitor C54, the fifty-fifth capacitor C55, the fifty-sixth capacitor C56, the fifty-seventh capacitor C57, the fifty-eighth capacitor C58, the fifty-ninth capacitor C59, the sixtieth capacitor C60, the sixty-first capacitor C61, the sixty-second capacitor C62, the second fuse F2, the third fuse F3, the fourth fuse F4, the fourth diode D4, the fifth diode D5, the sixth diode D6, the seventh diode D7, the eighth diode D8, the ninth diode D9, the tenth diode D10, the eleventh diode D11, the twelfth diode D12 and the second inductor L2.

[0043] In this embodiment, the second driver chip U3 includes pins EN (enable terminal), IN, SW, FB and GND. The GPIO signal output by the deserialization chip U1 is input to the pin EN of the second driver chip U3 after being divided by the fifty-sixth resistor R56 and the fifty-seventh resistor R57. The pin IN of the second driver chip U3 is connected to the first power signal V1. The second driver chip U3 converts and processes the first power signal V1 connected according to the GPIO signal to obtain power VGH (screen on voltage), power VGL (screen off voltage), power VCOM (common reference voltage) and power VDD (module power supply voltage): power VGH is usually between 15-30V. Without this voltage, the LCD screen will not be able to light up, and the image will appear gray and unclear. Power VGL is generally negative 6V to negative 8V. This voltage controls the off state of the screen. Power VGH and power VGL can control the transparency and deflection angle of the liquid crystal molecules. Power VCOM is usually 8V. If this voltage is abnormal, it may cause a white screen or a negative image. The power supply VDD is generally 3.3V or 1.8V. If this voltage is abnormal, it may cause a gray screen. These voltages play a vital role in the LCD screen, ensuring the normal display and stable operation of the screen.

[0044] Figure 5 is a circuit diagram of a key conversion module provided in an embodiment of the present invention, such as Figure 5 As shown, the key conversion module 140 includes an input / output interface expansion chip U4, the input end of the input / output interface expansion chip U4 is connected to the key, the communication end of the input / output interface expansion chip U4 is connected to the deserialization module 110, and the input / output interface expansion chip U4 is used to expand the number of access keys.

[0045] In this embodiment, the key conversion module 140 also includes a seventy-fourth resistor R74, a seventy-fifth resistor R75, a seventy-sixth resistor R76, a seventy-seventh resistor R77, a seventy-eighth resistor R78, a seventy-ninth resistor R79 and an eightieth resistor R80. The input / output interface expansion chip U4 includes pins INT, SCL, SDA, VDD, A0, A1, A2, VSS, P0, P1, P2, P3, P4, P5, P6 and P7. Pins P0, P1, P2, P3, P4, P5, P6 and P7 are used to connect keys and transmit the instructions output by the keys to the input / output interface expansion chip U4. Figure 2, pin INT is connected to the KEY INT signal output by the deserialization chip U1, the input / output interface expansion chip U4 processes the key command and outputs a digital signal, and communicates with the pins SCL and SDA of the deserialization chip U1 through the pins SCL and SDA. For example, the input / output interface expansion chip U4 converts the high and low level signals generated by the key input into I2C bus transmission, which can save the number of processor pins. At the same time, the input / output interface expansion chip U4 has strong scalability and can increase the number of keys according to actual needs.

[0046] Based on the above embodiments, Figure 6 is a schematic diagram of another mining vehicle display screen control circuit provided by an embodiment of the present invention. Figure 6 As shown, the mine vehicle-mounted display screen control circuit also includes a power conversion module 610, which is connected to the host, the deserialization module 110, the backlight driver module 120, the liquid crystal driver module 130 and the key conversion module 140. The power conversion module 610 is used to convert the power output of the host and supply power to the deserialization module 110, the backlight driver module 120, the liquid crystal driver module 130 and the key conversion module 140. Among them, the power conversion module 610 is a module that converts the power signal output by the host to meet the power supply requirements of the deserialization module 110, the backlight driver module 120, the liquid crystal driver module 130 and the key conversion module 140.

[0047] Specifically, the power conversion module 610 includes a first conversion unit 611, a second conversion unit 612 and a third conversion unit 613. The input end of the first conversion unit 611 is connected to the host, the first output end of the first conversion unit 611 is connected to the liquid crystal driving module 130, the input end of the second conversion unit 612 is connected to the second output end of the first conversion unit 611, the output end of the second conversion unit is connected to the deserialization module 110, the input end of the third conversion unit 613 is connected to the first output end of the first conversion unit, and the output end of the third conversion unit 613 is connected to the liquid crystal display screen. The first conversion unit 611 is used to convert the power signal V0 output by the host into a first power signal V1 and a second power signal V2, the second conversion unit 612 is used to convert the second power signal V2 into a third power signal V3, and the third conversion unit 613 is used to convert the first power signal V1 into a fourth power signal V4.

[0048] In this embodiment, the first conversion unit 611 is a unit for converting a voltage signal output by the host. The first conversion unit 611 includes a first power conversion chip U5, an eighty-first resistor R81, an eighty-second resistor R82, an eighty-third resistor R83, an eighty-fourth resistor R84, an eighty-fifth resistor R85, an eighty-sixth resistor R86, an eighty-seventh resistor R87, an eighty-eighth resistor R88, an eighty-ninth resistor R89, a ninety-first resistor R90, a ninety-first resistor R91, a sixty-third capacitor C63, a sixty-fourth capacitor C64, a sixty-fifth capacitor C65, a sixty-sixth capacitor C66, a sixty-seventh capacitor C67, a sixty-eighth capacitor C68, a sixty-ninth capacitor C69, a seventy-first capacitor C70, a seventy-first capacitor C71, a seventy-second capacitor C72, a seventy-third capacitor C73, a third inductor L3, a thirteenth diode D13, a fourteenth diode D14, a fifteenth diode D15, a fifth fuse F5, a second transistor Q2, and a third transistor Q3. The first power conversion chip U5 includes a pin BOOT, a pin VIN, a pin EN, a pin RT / CLK, a pin SW, a pin GND and a pin COMP. Among them, the pin VIN is connected to the host, combined with Figure 2 , the GPIO_REG8 signal output by the deserialization chip is connected to the first conversion unit 611 after being divided by the eighty-first resistor R81 and the eighty-second resistor R82. For example, the voltage of the power signal output by the host is 12V. After the first power conversion chip U5 converts the input 12V voltage signal, it outputs the power signal LCM_5V (i.e., the first power signal V1) through the first output terminal and outputs the power signal VCC_5V (i.e., the second power signal V2) through the second output terminal. The power signal LCM_5V is used to power the LCD display and the output can be turned off. The power signal VCC_5V is used to power the control mainboard and needs to be kept on and cannot be powered off.

[0049] Continue to refer Figure 6 The second conversion unit 612 is a unit for converting the second power signal V2 output from the second output terminal of the first conversion unit 611. The second conversion unit 612 includes a second power conversion chip U6, a seventy-fourth capacitor C74, a seventy-fifth capacitor C75, a seventy-sixth capacitor C76, a seventy-seventh capacitor C77 and a sixteenth diode D16. The second power conversion chip U6 includes a pin IN, a pin OUT and a pin ADJ. Among them, the pin IN is connected to the second power signal V2. The second power conversion chip U6 converts the input second power signal V2 and outputs a third power signal V3 through the pin OUT. The voltage of the third power signal V3 is 3.3V. The third power signal V3 supplies power to the deserialization module 110. Figure 2 In the deserialization module 110 , the third power signal V3 is converted into a fifth power signal V5 and a sixth power signal V6 .

[0050] Continue to refer Figure 6 The third conversion unit 613 is a unit for converting the first power signal V1 outputted from the first output terminal of the first conversion unit 611. The third conversion unit 613 includes a third power conversion chip U7, a seventy-eighth capacitor C78, ​​a seventy-ninth capacitor C79, an eightieth capacitor C80, an eighty-first capacitor C81 and a seventeenth diode D17. The third power conversion chip U7 includes a pin IN, a pin OUT and a pin ADJ. Among them, the pin IN is connected to the first power signal V1. The third power conversion chip U7 converts the input first power signal V1 and outputs a fourth power signal V4 through the pin OUT. The voltage of the fourth power signal V4 is 3.3V. The fourth power signal V4 is used to power the LCD display.

[0051] On the basis of the above embodiment, the deserialization module 110 is further connected to the touch screen, and the touch screen is used to communicate with the host according to the third deserialization signal (i.e., I2C signal) output by the deserialization module 110. Specifically, the pin 12S_DB / GPIO_REG5 of the deserialization chip U1 outputs a touch screen reset signal to control the touch screen reset, and the pin 12S_DA / GPIO_REG6 of the deserialization chip U1 outputs a touch screen power signal to provide power for the touch screen.

[0052] An embodiment of the present invention further provides a display screen device, Figure 7 is a schematic diagram of the structure of a display device provided by an embodiment of the present invention, such as Figure 7 As shown, the display screen device 10 includes a liquid crystal display screen, a touch screen, buttons and a control mainboard, and the mining vehicle-mounted display screen control circuit 100 in the above embodiment is arranged on the control mainboard.

[0053] In this embodiment, the control mainboard is connected to the host through a socket, and the socket uses an aviation socket to ensure reliable circuit connection. The control mainboard is connected to the buttons, touch screen and liquid crystal display screen through an FPC adapter board (Flexible Printed Circuit board). The FPC adapter board has the advantages of flexible connection, high reliability and easy installation and maintenance. After receiving the FPD-Link serial signal sent by the host, the mining vehicle-mounted display screen control circuit 100 on the control mainboard performs signal deserialization, converts the serial signal into LVDS signal, I2C signal, PWM signal and GPIO signal to drive the liquid crystal display screen, touch screen, and button, and realizes the display of the liquid crystal display screen and touch and button interaction. The mining vehicle-mounted display screen control circuit provided in this embodiment deserializes the serial signal through a deserialization module, and the display screen adopts serial signal communication, and only four cables are required to complete the data transmission of the display screen, the wiring is simple and the transmission signal is stable, and the mining vehicle-mounted display screen control circuit is applied to the display screen device, which improves the anti-interference performance of the display screen device.

[0054] An embodiment of the present invention further provides a vehicle, Figure 8 is a schematic diagram of the structure of a vehicle provided by an embodiment of the present invention, such as Figure 8 As shown, the vehicle 20 provided in this embodiment includes the display screen device 10 in the above embodiment. Applying the display screen device 10 in the above embodiment to the vehicle 20 can stabilize data transmission when the vehicle is running, thereby improving the safety of vehicle operation.

[0055] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0056] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A mining vehicle display screen control circuit, characterized in that: Including deserialization module, backlight driving module, LCD driving module and key conversion module; The deserialization module is connected to the host, and is used to deserialize the serial signal output by the host and output a first deserialization signal, a second deserialization signal, a third deserialization signal and a fourth deserialization signal; The backlight driving module is connected to the backlight source and the deserialization module, and the backlight driving module is used to adjust the backlight source according to the first deserialization signal; The liquid crystal driving module is connected to the liquid crystal display screen and the deserialization module, and the liquid crystal driving module is used to drive the liquid crystal display screen according to the second deserialization signal; The key conversion module connects the key and the deserialization module, and the key conversion module is used to communicate with the key according to the third deserialization signal.

2. The mining vehicle-mounted display screen control circuit according to claim 1 is characterized in that: The deserialization module includes a deserialization chip, an input end, a first output end, a second output end, a third output end and a fourth output end. The deserialization chip is connected to the host through the input end, the first output end outputs the first deserialization signal, the second output end outputs the second deserialization signal, the third output end outputs the third deserialization signal, and the fourth output end outputs the fourth deserialization signal. The deserialization chip is connected to the backlight driving module through the first output end, the deserialization chip is connected to the liquid crystal driving module through the second output end, the deserialization chip is connected to the key conversion module through the third output end, and the deserialization chip is connected to the liquid crystal display through the fourth output end.

3. The mining vehicle-mounted display screen control circuit according to claim 1 is characterized in that: The backlight driving module includes a first driving chip, an input end of the first driving chip is connected to the deserialization module, an enable end of the first driving chip is connected to the deserialization module, an output end of the first driving chip is connected to the backlight source, and the first driving chip is used to drive the backlight source according to the first deserialization signal output by the deserialization module.

4. The mining vehicle-mounted display screen control circuit according to claim 1 is characterized in that: The liquid crystal driving module includes a second driving chip, a first output end, a second output end, a third output end and a fourth output end, the first output end, the second output end, the third output end and the fourth output end are connected to the liquid crystal display screen, the enable end of the second driving chip is connected to the deserialization module, and the second driving chip is used to drive the liquid crystal display screen according to the second deserialization signal output by the deserialization module.

5. The mining vehicle-mounted display screen control circuit according to claim 1 is characterized in that: The key conversion module includes an input / output interface expansion chip, the input end of the input / output interface expansion chip is connected to the key, the communication end of the input / output interface expansion chip is connected to the deserialization module, and the input / output interface expansion chip is used to expand the number of keys connected.

6. The mining vehicle-mounted display screen control circuit according to claim 1 is characterized in that: It also includes a power conversion module, which is connected to the host, the deserialization module, the backlight driving module, the liquid crystal driving module and the key conversion module. The power conversion module is used to convert the output power of the host and provide power for the deserialization module, the backlight driving module, the liquid crystal driving module and the key conversion module.

7. The mining vehicle-mounted display screen control circuit according to claim 6 is characterized in that: The power conversion module includes a first conversion unit, a second conversion unit and a third conversion unit. The input end of the first conversion unit is connected to the host, the first output end of the first conversion unit is connected to the liquid crystal driving module, the input end of the second conversion unit is connected to the second output end of the first conversion unit, the output end of the second conversion unit is connected to the deserialization module, the input end of the third conversion unit is connected to the first output end of the first conversion unit, and the output end of the third conversion unit is connected to the liquid crystal display. The first conversion unit is used to convert the power signal output by the host into a first power signal and a second power signal, the second conversion unit is used to convert the second power signal into a third power signal, and the third conversion unit is used to convert the first power signal into a fourth power signal.

8. The mining vehicle-mounted display screen control circuit according to claim 1 is characterized in that: The deserialization module is also connected to a touch screen, and the touch screen is used to communicate with the host according to a third deserialization signal output by the deserialization module.

9. A display screen device, characterized in that: It comprises the mining vehicle-mounted display screen control circuit as described in any one of claims 1-8.

10. A vehicle, characterized in that: The invention comprises the display screen device as claimed in claim 9.

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