LCD (liquid crystal display) capable of broadcasting road condition changes in real time

Abstract

The utility model relates to the technical field of LCD liquid crystal display screens, and discloses an LCD liquid crystal display screen capable of broadcasting road condition changes in real time, which comprises a control circuit, a power supply management circuit, an interface circuit, a driving IC circuit, a TFT switch circuit and a backlight circuit, the interface circuit, the driving IC circuit, the TFT switching circuit and the backlight circuit are all electrically connected with the control circuit and the power management circuit. Through the design of the interface circuit and the driving IC circuit, the interface circuit can transmit a control signal and a data signal from the control circuit to the driving IC circuit to realize high-speed and stable communication, and the driving IC circuit decodes and processes the received signal to generate a signal for controlling the TFT switching circuit and the backlight circuit so as to realize image display; through the design of the TFT switching circuit, the charging and discharging of the liquid crystal capacitor are realized, so that the brightness change of pixel points is controlled, the accurate display of road condition information is ensured, and the problems of image distortion or blurring and the like are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to LCD liquid crystal display screen technical field, concretely is a kind of real-time broadcast road condition changes's LCD liquid crystal display screen. BACKGROUND

[0002] LCD liquid crystal display screen is a kind of technology using the optical characteristics of liquid crystal substance, changes the light transmissivity by controlling electric field, to realize image display.

[0003] Through the retrieval, the patent with application No. CN202110796763.1 discloses a kind of vehicle-mounted high-definition LCD display screen, belongs to intelligent navigation display technical field, including by being photographed in the vehicle driving the driving video of vehicle before and after and the driving state of driver, the content sent to display module by camera module shooting, according to vehicle positioning and vehicle moving time, obtain speed, according to different speed setting different broadcast content, when driving bend, speed and topography bend are combined to process and obtain over-bend speed and wheel steering angle limit, and the data is sent voice module and is broadcast, store the video and speed of shooting, set up timing cleaning and maximum limit cleaning mode, selectively clean the stored data, the application improves the diversity and comprehensiveness of vehicle-mounted display function, realizes the real-time monitoring to road condition, speed and vehicle condition, by setting login account let passenger and driver share information, real-time tracking is carried out to driving state, improves passenger safety.

[0004] Current vehicle-mounted LCD liquid crystal display screen when broadcasting road condition information, the generated road condition image display is not clear enough, there is image distortion, fuzzy condition, reduce the visual experience of driver;And data signal transmission communication process is unstable, slow, the accuracy and real-time of road condition broadcast are influenced, therefore we need to propose a kind of real-time broadcast road condition changes's LCD liquid crystal display screen. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of real-time broadcast road condition changes's LCD liquid crystal display screen, by the design of interface circuit and drive IC circuit, interface circuit can transmit control signal and data signal from control circuit to drive IC circuit, realize high speed, stable communication, drive IC circuit decodes and handles the signal received, generates the signal of control TFT switch circuit and backlight circuit, to realize the display of image;By the design of TFT switch circuit, realize the charging and discharging of liquid crystal capacitor, to control the light and shade change of pixel, ensure the accurate display of road condition information, avoid image distortion or fuzzy etc.

[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of real-time broadcast road condition changes's LCD liquid crystal display screen, comprising:

[0007] The control circuit is responsible for receiving external control signals and controlling the working state of the display screen according to the control signals.

[0008] The power management circuit converts the external power supply into the direct current voltage required by the LCD liquid crystal display screen.

[0009] The interface circuit receives external road condition information signals and transmits the road condition information signals to the driving IC inside the LCD liquid crystal display screen.

[0010] The driving IC circuit processes the received road condition information signals and generates a control thin film transistor open light state signal.

[0011] The TFT switch circuit controls the TFT switch state of each pixel point and changes the arrangement mode of the liquid crystal molecules according to the signal output by the driving IC circuit, so as to realize the display of the road condition image.

[0012] The backlight circuit provides lighting basis for the LCD liquid crystal display screen and ensures clear display of the road condition information.

[0013] The interface circuit, the driving IC circuit, the TFT switch circuit, and the backlight circuit are electrically connected with the control circuit and the power management circuit, and the interface circuit, the driving IC circuit, and the TFT switch circuit are connected in sequence, and the backlight circuit is electrically connected with the driving IC circuit.

[0014] Preferably, the interface circuit comprises an LVDS interface P8, the 1st pin, the 2nd pin, and the 3rd pin of the LVDS interface P8 are connected with a capacitor C43 and are connected with a 5V power supply voltage, the 33rd pin of the LVDS interface P8 is connected with a resistor R83, the 34th pin of the LVDS interface P8 is connected with a resistor R84, the 35th pin of the LVDS interface P8 is connected with a resistor R87, the 36th pin of the LVDS interface P8 is connected with a resistor R88, the 37th pin of the LVDS interface P8 is connected with a resistor R89, and the 38th pin of the LVDS interface P8 is connected with a resistor R90.

[0015] Preferably, the driving IC circuit comprises a gate drive circuit, the gate drive circuit comprises a driving chip U1, a MOS tube Q1, and a MOS tube Q2, the source of the MOS tube Q1 is connected with the drain of the MOS tube Q2, a diode D1 is connected between the 1st pin and the 8th pin of the driving chip U1, a resistor R2 is connected between the gate of the MOS tube Q1 and the 7th pin of the driving chip U1, a resistor R1 is connected between the gate of the MOS tube Q1 and the 6th pin of the driving chip U1, a resistor R4 is connected between the gate of the MOS tube Q2 and the 5th pin of the driving chip U1, and a resistor R3 is connected between the gate and the source of the MOS tube Q2.

[0016] Preferably, the driving IC circuit further comprises a source driving circuit, the source driving circuit comprises a driving chip U11, a rectifier bridge D2, resistors R11 and R21 are connected in series between the 4th pin of the driving chip U11 and the 2nd pin of the rectifier bridge D2, a capacitor C31 is connected between the 4th pin of the driving chip U11 and the 4th pin of the rectifier bridge D2, and a resistor R31 is connected between the 2nd pin of the driving chip U11 and the 4th pin of the rectifier bridge D2.

[0017] A capacitor C21 is connected between the 2nd pin and the 4th pin of the rectifier bridge D2, and a diode D3, a capacitor C11, a light emitting diode LED1, a light emitting diode LED2 and an inductor L1 are connected between the wire ends of the 5th pin and the 6th pin of the driving chip U11 and the 2nd pin of the rectifier bridge D2.

[0018] Preferably, the TFT switch circuit comprises a display screen LCD_TFT1 and a triode Q12, the 2nd pin of the display screen LCD_TFT1 is connected to the collector of the triode Q12, a capacitor C42 is connected between the 4th pin and the 10th pin of the display screen LCD_TFT1, a resistor R22 is connected between the base and the emitter of the triode Q12, and a resistor R32 connected to a power supply is further connected to the base of the triode Q12.

[0019] Preferably, the backlight circuit comprises an LED driving chip IC1, a wire holder J1 and a wire holder J2, a resistor R23 is connected between the 1st pin and the 8th pin of the LED driving chip IC1, the 1st pin of the wire holder J1 is connected to the 5th pin of the LED driving chip IC1, the 2nd pin of the wire holder J1 is connected to the 1st pin of the LED driving chip IC1, a resistor R13 is connected between the 3rd pin of the wire holder J1 and the 2nd pin of the LED driving chip IC1, an inductor L13 and a diode D13 are connected between the 1st pin and the 3rd pin of the LED driving chip IC1, the 1st pin of the wire holder J2 is connected to the 7th pin of the LED driving chip IC1, and the 2nd pin of the wire holder J2 is connected to the 6th pin of the LED driving chip IC1.

[0020] Compared with the prior art, the utility model has the advantages that:

[0021] 1、The utility model discloses an interface circuit and the design of driving IC circuit, and interface circuit can transmit control signal and data signal from control circuit to driving IC circuit, realizes high -speed, stable communication, and driving IC circuit decodes and handles the signal received, generates the signal of control TFT switch circuit and backlight circuit, thereby realizes the display of image;

[0022] 2、The utility model discloses the design of TFT switch circuit, realizes the charging and discharging of liquid crystal capacitor, thereby control the light and shade change of pixel, ensures the accurate display of road condition information, avoids image distortion or fuzzy and other problems. Attached Figure Description

[0023] Figure 1 This is a system block diagram of the present invention;

[0024] Figure 2 This is a circuit diagram of the interface circuit of this utility model;

[0025] Figure 3 This is a circuit diagram of the gate drive circuit of this utility model;

[0026] Figure 4 This is a circuit diagram of the source drive circuit of this utility model;

[0027] Figure 5 This is a circuit diagram of the TFT switch circuit of this utility model;

[0028] Figure 6 This is a circuit diagram of the backlight circuit of this utility model. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figures 1-6 This utility model provides a technical solution: an LCD screen for real-time reporting of road condition changes, comprising:

[0031] The control circuit is responsible for receiving external control signals (power on / off, brightness adjustment) and controlling the display screen's operating status accordingly. This control circuit includes a microprocessor (MCU), button interface, high-voltage board interface, etc., which are existing technologies and will not be described further. The control circuit needs to possess high reliability and flexibility to adapt to different control requirements.

[0032] A power management circuit converts external power into the DC voltage required by the LCD screen. This circuit includes a rectifier and filter circuit, a PWM (Pulse Width Modulation) control chip, a switching transistor, and protection circuits; this is existing technology and will not be described further. It can operate stably under different mains voltages and simultaneously provide multiple output voltages to meet the needs of different circuits within the display screen.

[0033] It receives external traffic information signals and transmits them to the interface circuit in the driver IC inside the LCD screen. The interface circuit has high-speed signal transmission capability and good anti-interference performance to ensure accurate transmission of traffic information.

[0034] The interface circuit includes an LVDS interface P8. Pins 1, 2, and 3 of the LVDS interface P8 are connected to a capacitor C43 and connected to a 5V power supply. The capacitor C43 acts as a filter. Pin 33 of the LVDS interface P8 is connected to a resistor R83. Pin 34 of the LVDS interface P8 is connected to a resistor R84. Pin 35 of the LVDS interface P8 is connected to a resistor R87. Pin 36 of the LVDS interface P8 is connected to a resistor R88. Pin 37 of the LVDS interface P8 is connected to a resistor R89. Pin 38 of the LVDS interface P8 is connected to a resistor R90.

[0035] The LVDS signal pins of the P8 LVDS interface, such as LVDS0_V0_N and LVDS0_V0_P, are used to transmit low-voltage differential signals. Here, N represents the negative signal terminal and P represents the positive signal terminal. Differential signal transmission can improve the signal's anti-interference capability and transmission rate.

[0036] The CLK (clock) signal pins of the LVDS interface P8, such as LVDS0_CK_N and LVDS0_CK_P, provide a clock reference for data transmission.

[0037] The PB7_LCD / LVDS / MIPI_TP_RST and PB0_LCD_BL_PWMR3 pins of the LVDS interface P8 are used to control functions such as screen reset and backlight.

[0038] The driver IC circuit processes the received traffic information signals and generates control signals for the switching status of thin-film transistors. It is responsible for scanning line by line and providing voltage signals for each pixel. The performance of the driver IC circuit affects the display effect and response speed of the LCD screen. Therefore, a high-performance driver IC needs to be selected to meet the requirements of real-time traffic information broadcasting.

[0039] The driver IC circuit includes a gate drive circuit, which includes a driver chip U1, a MOSFET Q1, and a MOSFET Q2. The source of the MOSFET Q1 is connected to the drain of the MOSFET Q2. A diode D1 is connected between pins 1 and 8 of the driver chip U1. A resistor R2 is connected between the gate of the MOSFET Q1 and pin 7 of the driver chip U1. A resistor R1 is connected between the gate of the MOSFET Q1 and pin 6 of the driver chip U1. A resistor R4 is connected between the gate of the MOSFET Q2 and pin 5 of the driver chip U1. Resistors R2 and R4 limit current and protect the gate of the MOSFETs. A resistor R3 is connected between the gate and source of the MOSFET Q2. Resistors R1 and R3 discharge gate charge and ensure reliable turn-off of the MOSFETs.

[0040] Pins 2 and 3 of the driver chip U1 are input pins used to receive control signals, and pins 5 and 7 of the driver chip U1 are output pins connected to MOSFETs Q1 and Q2.

[0041] Capacitor C2 acts as a filter to stabilize the operating voltage of the driver chip U1.

[0042] The driver IC circuit also includes a source driver circuit, which includes a driver chip U11 and a rectifier bridge D2. Resistors R11 and R21 are connected in series between pin 4 of the driver chip U11 and pin 2 of the rectifier bridge D2. A capacitor C31 is connected between pin 4 of the driver chip U11 and pin 4 of the rectifier bridge D2. A resistor R31 is connected between pin 2 of the driver chip U11 and pin 4 of the rectifier bridge D2.

[0043] A capacitor C21 is connected between pins 2 and 4 of the rectifier bridge D2. A diode D3, a capacitor C11, an LED1, an LED2, and an inductor L1 are connected between pins 5 and 6 of the driver chip U11 and pin 2 of the rectifier bridge D2.

[0044] Capacitor C21 is connected to the output terminal of rectifier bridge D2 to filter and smooth the pulsating DC voltage, making it closer to the DC voltage. Resistors R11 and R21 are used to discharge capacitor C21. When the circuit is powered off, they quickly release the charge stored on the capacitor to ensure safety.

[0045] Diode D3 acts as a freewheeling diode, ensuring that the current in inductor L1 continues to flow when the switching transistor is turned off, thereby stabilizing the current and voltage of the LEDs and enabling LED1 and LED2 to emit light normally.

[0046] The TFT switching circuit controls the TFT switching state of each pixel and changes the arrangement of liquid crystal molecules according to the signal output by the driver IC circuit, thus realizing the display of road condition images. The TFT switching circuit contains a large number of TFT switching elements, each corresponding to a pixel. The TFT switching circuit needs to have high switching speed, low power consumption and stability to ensure the clarity and smoothness of the image.

[0047] The TFT switching circuit includes a display screen LCD_TFT1 and a transistor Q12. Pin 2 of the display screen LCD_TFT1 is connected to the collector of the transistor Q12. A capacitor C42 is connected between pins 4 and 10 of the display screen LCD_TFT1. A resistor R22 is connected between the base and emitter of the transistor Q12. A power supply resistor R32 is also connected to the base of the transistor Q12.

[0048] When the LCD_POWER signal is high, transistor Q12 is turned on, providing a power path for subsequent circuits. Capacitor C42 is connected between the 3.3V power supply and ground, acting as a filter to stabilize the power supply and reduce the impact of power supply noise on the circuit.

[0049] Pin 2 of the LCD_TFT1 display is used to control the cathode of the LCD backlight, pin 3 provides 3.3V power, pin 4 is used to control the anode of the LCD backlight, pin 5 is the LCD reset pin, used to initialize the LCD, pin 6 is the write control and register select pin, used to control data writing and register selection, pin 7 is the SPI (Serial Peripheral Interface) data input pin, used to transmit data to the LCD, pin 8 is the SPI clock pin, providing a clock signal for data transmission, and pin 11 is the chip select pin, used to select the LCD.

[0050] Backlight circuits provide illumination for LCD displays and ensure clear display of road information. The backlight circuits feature adjustable brightness, low power consumption, and long service life to meet different lighting environments and energy-saving requirements.

[0051] The backlight circuit includes an LED driver chip IC1, a connector J1, and a connector J2. A resistor R23 is connected between pins 1 and 8 of the LED driver chip IC1. Pin 1 of the connector J1 is connected to pin 5 of the LED driver chip IC1. Pin 2 of the connector J1 is connected to pin 1 of the LED driver chip IC1. A resistor R13 is connected between pin 3 of the connector J1 and pin 2 of the LED driver chip IC1. An inductor L13 and a diode D13 are connected between pins 1 and 3 of the LED driver chip IC1. Pin 1 of the connector J2 is connected to pin 7 of the LED driver chip IC1. Pin 2 of the connector J2 is connected to pin 6 of the LED driver chip IC1.

[0052] An ON / OFF switch is used to control the on / off state of a circuit. When the switch is in the ON position, the circuit is powered on and begins to work; when it is in the OFF position, the circuit is powered off and stops working.

[0053] Pin 2 of the LED driver chip IC1 is related to the oscillator's resistor setting and is connected to the power supply via an external resistor R13 to set the oscillator parameters. Pin 3 is grounded via capacitor C23 for the internal circuitry's capacitor configuration. Pin 4 is connected to inductor L13 (560uH) and diode D13 (1N4148), forming part of a boost circuit to increase the input voltage to a suitable level for driving the EL backlight. Pins 6 and 7 are output pins connected to terminal block J2 to provide the driving voltage for the EL backlight.

[0054] The interface circuit, driver IC circuit, TFT switch circuit, and backlight circuit are all electrically connected to the control circuit and power management circuit. The interface circuit, driver IC circuit, and TFT switch circuit are connected in sequence, and the backlight circuit is electrically connected to the driver IC circuit.

[0055] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An LCD display screen for real-time reporting of traffic conditions, characterized in that, include: The control circuit is responsible for receiving external control signals and controlling the working status of the display screen according to the control signals. A power management circuit that converts external power into the DC voltage required by the LCD screen. It receives external traffic information signals and transmits them to the interface circuit in the driver IC inside the LCD screen. A driver IC circuit that processes the received road condition information signal and generates a signal to control the switching status of the thin-film transistor. The TFT switching circuit controls the TFT switching state of each pixel and changes the arrangement of liquid crystal molecules according to the signal output by the driver IC circuit, thereby realizing the display of road condition images. Backlight circuitry provides illumination for LCD displays and ensures clear display of road condition information; The interface circuit, driver IC circuit, TFT switch circuit, and backlight circuit are all electrically connected to the control circuit and power management circuit. The interface circuit, driver IC circuit, and TFT switch circuit are connected in sequence, and the backlight circuit is electrically connected to the driver IC circuit.

2. The LCD liquid crystal display screen for real-time traffic condition reporting according to claim 1, characterized in that: The interface circuit includes an LVDS interface P8. Pins 1, 2, and 3 of the LVDS interface P8 are connected to a capacitor C43 and a 5V power supply. Pin 33 of the LVDS interface P8 is connected to a resistor R83. Pin 34 of the LVDS interface P8 is connected to a resistor R84. Pin 35 of the LVDS interface P8 is connected to a resistor R87. Pin 36 of the LVDS interface P8 is connected to a resistor R88. Pin 37 of the LVDS interface P8 is connected to a resistor R89. Pin 38 of the LVDS interface P8 is connected to a resistor R90.

3. The LCD liquid crystal display screen for real-time broadcasting of traffic conditions according to claim 1, characterized in that: The driving IC circuit includes a gate driving circuit, which includes a driving chip U1, a MOSFET Q1, and a MOSFET Q2. The source of the MOSFET Q1 is connected to the drain of the MOSFET Q2. A diode D1 is connected between pin 1 and pin 8 of the driving chip U1. A resistor R2 is connected between the gate of the MOSFET Q1 and pin 7 of the driving chip U1. A resistor R1 is connected between the gate of the MOSFET Q1 and pin 6 of the driving chip U1. A resistor R4 is connected between the gate of the MOSFET Q2 and pin 5 of the driving chip U1. A resistor R3 is connected between the gate and source of the MOSFET Q2.

4. The LCD liquid crystal display screen for real-time broadcasting of traffic conditions according to claim 1, characterized in that: The driver IC circuit also includes a source driver circuit, which includes a driver chip U11 and a rectifier bridge D2. Resistors R11 and R21 are connected in series between pin 4 of the driver chip U11 and pin 2 of the rectifier bridge D2. A capacitor C31 is connected between pin 4 of the driver chip U11 and pin 4 of the rectifier bridge D2. A resistor R31 is connected between pin 2 of the driver chip U11 and pin 4 of the rectifier bridge D2. A capacitor C21 is connected between pins 2 and 4 of the rectifier bridge D2. A diode D3, a capacitor C11, an LED1, an LED2, and an inductor L1 are connected between pins 5 and 6 of the driver chip U11 and pin 2 of the rectifier bridge D2.

5. An LCD liquid crystal display screen for real-time broadcasting of traffic conditions according to claim 1, characterized in that: The TFT switching circuit includes a display screen LCD_TFT1 and a transistor Q12. Pin 2 of the display screen LCD_TFT1 is connected to the collector of the transistor Q12. A capacitor C42 is connected between pins 4 and 10 of the display screen LCD_TFT1. A resistor R22 is connected between the base and emitter of the transistor Q12. A power supply resistor R32 is also connected to the base of the transistor Q12.

6. An LCD liquid crystal display screen for real-time broadcasting of traffic conditions according to claim 1, characterized in that: The backlight circuit includes an LED driver chip IC1, a connector J1, and a connector J2. A resistor R23 is connected between pins 1 and 8 of the LED driver chip IC1. Pin 1 of the connector J1 is connected to pin 5 of the LED driver chip IC1. Pin 2 of the connector J1 is connected to pin 1 of the LED driver chip IC1. A resistor R13 is connected between pin 3 of the connector J1 and pin 2 of the LED driver chip IC1. An inductor L13 and a diode D13 are connected between pins 1 and 3 of the LED driver chip IC1. Pin 1 of the connector J2 is connected to pin 7 of the LED driver chip IC1. Pin 2 of the connector J2 is connected to pin 6 of the LED driver chip IC1.

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