Industrial low-temperature-resistant LCD display screen equipment

Abstract

The utility model relates to industrial low-temperature-resistant LCD display screen equipment, and relates to the technical field of LCD display screen equipment. The display module comprises a display driving board and an LCD display screen arranged on the display driving board, and the display driving board is electrically connected with the LCD display screen; an inner electric layer heating wire is arranged on the display driving board, and the inner electric layer heating wire is a long and thin wire; the display driving board is further provided with a temperature sensor and a heating control circuit electrically connected with the temperature sensor, and the inner electric layer heating wire is connected to the heating control circuit in a controlled mode. The method has the effect that the LCD display screen can normally work in the low-temperature working environment as much as possible.

Description

Technical Field

[0001] This application relates to the technical field of LCD display equipment, and in particular to an industrial low-temperature resistant LCD display equipment. Background Technology

[0002] As a core display component of modern electronic devices, LCD displays are widely used in consumer electronics, industrial control, and automotive displays. Their standard operating temperature range is typically designed from -25°C to +70°C, which meets the needs of most common applications. However, in extremely cold environments or special industrial applications, when the ambient temperature drops sharply to -40°C or even lower, traditional LCD displays face severe challenges: not only will they experience a significant decrease in response speed and reduced display contrast, but they may also suffer irreversible physical damage to the liquid crystal material. This will seriously affect the operational reliability of the equipment and the user experience for end users.

[0003] Currently, the industry's conventional solution is to maintain the operating temperature of LCD displays using external heating devices. This involves attaching a separate heating film or heating element to the back of the LCD display and providing necessary temperature control through electrical heating. However, this external temperature control solution has significant limitations: it not only increases the overall size and weight of the system but also significantly raises manufacturing costs and energy consumption. Furthermore, it presents numerous challenges in terms of system integration and reliability. These factors largely limit the application scope and development potential of LCD displays in extreme environmental conditions. Utility Model Content

[0004] In order to enable the LCD display to operate normally in low-temperature environments as much as possible, this application provides an industrial low-temperature resistant LCD display device.

[0005] The industrial low-temperature resistant LCD display device provided in this application adopts the following technical solution:

[0006] An industrial low-temperature resistant LCD display device includes a display driver board and an LCD display screen disposed on the display driver board, wherein the display driver board and the LCD display screen are electrically connected; an inner electric layer heating wire is disposed on the display driver board, and the inner electric layer heating wire is configured as a thin and long wire; the display driver board is also configured with a temperature sensor and a heating control circuit electrically connected to the temperature sensor, and the inner electric layer heating wire is controlled to be connected to the heating control circuit.

[0007] By adopting the above technical solution, the inner electric layer heating wire is placed on the display driver board, which enables heating of the LCD screen and effectively improves the LCD screen's performance in low-temperature environments. A temperature sensor is used to monitor the ambient temperature in real time. The temperature control circuit is electrically connected to the temperature sensor and can dynamically control the heating of the inner electric layer heating wire based on the monitored temperature, thereby ensuring that the LCD screen can operate normally in low-temperature environments and improving its low-temperature resistance.

[0008] Preferably, the heating control circuit includes a window comparison unit, a control unit, and a power supply V2. The output terminal of the temperature sensor is electrically connected to the input terminal of the window comparison unit, and the output terminal of the window comparison unit is electrically connected to the control terminal of the control unit. The inner electric layer heating wire is equivalent to a heating resistor RL. One end of the heating resistor RL is electrically connected to the input terminal of the control unit, and the other end of the heating resistor RL is electrically connected to the voltage output terminal of the power supply V2. The output terminal of the control unit is grounded.

[0009] By adopting the above technical solution, the output of the temperature sensor is monitored by the window comparison unit to ensure that heating is only started at low temperatures, avoiding overheating or energy waste; the heating power is dynamically adjusted by the control unit, and power is only supplied when needed, thereby improving the energy efficiency ratio.

[0010] Preferably, the window comparison unit includes an operational amplifier U1, an NMOS transistor Q1, and a PMOS transistor Q2. The voltage output terminal Vtemp of the temperature sensor is electrically connected to the inverting input terminal of the operational amplifier U1 through a resistor R1. The voltage output terminal of the power supply V1 is grounded sequentially through resistors R2, R3, R4, and R5. The connection point between resistors R3 and R4 is electrically connected to the non-inverting input terminal of the operational amplifier U1. The output terminal of the operational amplifier U1 is electrically connected to the gate of the NMOS transistor Q1 and the gate of the PMOS transistor Q2. The drain of the NMOS transistor Q1 is electrically connected to the voltage output terminal of the power supply V1. The source of the NMOS transistor Q1 is electrically connected to the connection point between resistors R2 and R3. The source of the PMOS transistor Q2 is electrically connected to the connection point between resistors R4 and R5. The drain of the PMOS transistor Q2 is grounded. The output terminal of the operational amplifier U1 is set as the output terminal of the window comparison unit.

[0011] By adopting the above technical solution, using operational amplifier U1, NMOS transistor Q1 and PMOS transistor Q2 and peripheral components, the start and stop thresholds of heating can be accurately set, avoiding frequent switching.

[0012] Preferably, the control unit includes a transistor Q3, the output terminal of the window comparator is grounded in sequence through resistors R6 and R7, the connection point between resistors R6 and R7 is electrically connected to the base of the transistor Q3, the collector of the transistor Q3 is set as the input terminal of the control unit, and the emitter of the transistor Q3 is set as the output terminal of the control unit.

[0013] By adopting the above technical solution, transistor Q3 is used as the switching device for heating the inner electric layer heating wire. Transistor Q3 has a fast response speed, long lifespan, and is suitable for frequent start-stop in low temperature environments.

[0014] Preferably, the inner electric layer heating wire has a serpentine uniform wiring structure.

[0015] By adopting the above technical solution, the serpentine wiring ensures that the heating wires evenly cover the display driver board, avoiding local overheating or uneven heating and improving the consistency of LCD display.

[0016] Preferably, the LCD display device is fixedly connected to the display driver board by welding.

[0017] By adopting the above technical solution, it is ensured that the LCD display and the driver board maintain a stable connection in low-temperature environments, thus avoiding poor contact.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] 1. By uniformly laying the inner electric layer heating wires on the display driver board and combining them with temperature sensors and temperature control circuits, precise temperature control of the LCD screen can be achieved, effectively improving the working performance of the LCD screen in low-temperature environments.

[0020] 2. The temperature control circuit dynamically adjusts the working state of the inner electric layer heating wire through the window comparison unit and the control unit. It can automatically start heating when the detected temperature is lower than the set low limit and stop heating when it is higher than the high limit, thereby ensuring that the LCD screen is always within a suitable operating temperature range. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0022] Figure 2 This is a schematic diagram illustrating the wiring structure in an embodiment of this application;

[0023] Figure 3 This is a circuit diagram of the heating control circuit in an embodiment of this application.

[0024] Reference numerals: 1. Display driver board; 2. LCD display screen; 3. Temperature sensor; 4. Inner pad heating wire; 5. Window comparison unit; 6. Control unit. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0026] This application discloses an industrial low-temperature resistant LCD display device.

[0027] Reference Figure 1 and Figure 2 An industrial low-temperature resistant LCD display device includes a display driver board 1 and an LCD display 2 disposed on the display driver board 1, and the display driver board 1 and the LCD display 2 are electrically connected. The display driver board 1 is provided with inner electric layer heating wires, which are long and thin wires and are evenly laid on the display driver board 1 to achieve a heating function. In addition, the display driver board 1 is also equipped with a temperature sensor 3 and a heating control circuit electrically connected to the temperature sensor 3. The heating control circuit is used to control the heating or stopping of the inner electric layer heating wires, thereby dynamically realizing the heating function of the LCD display 2 according to the real-time temperature, thus enabling the LCD display 2 to be more resistant to low temperatures.

[0028] The LCD display screen 2 is fixedly connected to the display driver board 1 by welding, and the temperature sensor 3 is located on the side of the display driver board 1 away from the LCD display screen 2. In this embodiment, the heating wires of the inner electric layer are uniformly routed in a serpentine pattern on the display driver board 1. In other embodiments, spiral or other shapes can be used for routing as needed to ensure heating uniformity.

[0029] refer to Figure 3The heating control circuit includes a window comparison unit 5, a control unit 6, and a power supply V2. In this embodiment, the output voltage of the power supply V2 is set to 24V. The output terminal of the temperature sensor 3 is electrically connected to the input terminal of the window comparison unit 5, and the output terminal of the window comparison unit 5 is electrically connected to the control terminal of the control unit 6. The inner layer heating wire is equivalent to a heating resistor RL. One end of the heating resistor RL is electrically connected to the input terminal of the control unit 6, and the other end of the heating resistor RL is electrically connected to the voltage output terminal of the power supply V2. The output terminal of the control unit 6 is grounded. The window comparison unit 5 can set a reference voltage to set a temperature lower limit. By comparing the reference voltage with the output voltage of the temperature sensor 3, it can be determined whether the current temperature on the circuit board is higher or lower than the temperature lower limit. If the current temperature is lower than the temperature lower limit or higher than the temperature higher limit, the window comparison unit 5 outputs a stop signal to the control unit 6. After receiving the stop signal, the control unit 6 can disconnect the electrical connection between the heating resistor RL and ground, thereby stopping the heating of the inner layer heating wire.

[0030] The window comparison unit 5 includes an operational amplifier U1, an NMOS transistor Q1, a PMOS transistor Q2, and a power supply V1. In this embodiment, the output voltage of the power supply V1 is set to 5V. The voltage output terminal Vtemp of the temperature sensor 3 is electrically connected to the inverting input terminal of the operational amplifier U1 through a resistor R1. The voltage output terminal of the power supply V1 is grounded in sequence through resistors R2, R3, R4, and R5, and the connection point between resistors R3 and R4 is electrically connected to the non-inverting input terminal of the operational amplifier U1. The output terminal of the operational amplifier U1 is set as the output terminal of the window comparison unit 5.

[0031] The gate of NMOS transistor Q1 is electrically connected to the output terminal of operational amplifier U1, the drain of NMOS transistor Q1 is electrically connected to the voltage output terminal of power supply V1, and the source of NMOS transistor Q1 is electrically connected to the junction between resistors R2 and R3. The gate of PMOS transistor Q2 is electrically connected to the output terminal of operational amplifier U1, the drain of PMOS transistor Q2 is grounded, and the source of PMOS transistor Q2 is electrically connected to the junction between resistors R4 and R5.

[0032] When op-amp U1 outputs a high level, NMOS transistor Q1 is turned on, PMOS transistor Q2 is turned off, and resistor R2 is short-circuited. At this time, the voltage V+ at the non-inverting input of op-amp U1 is V1*(R4+R5) / (R3+R4+R5), which corresponds to the high temperature limit Vhigh. When op-amp U1 outputs a low level, NMOS transistor Q1 is turned off, PMOS transistor Q2 is turned on, and resistor R5 is short-circuited. At this time, the voltage V+ at the non-inverting input of op-amp U1 is V1*R4(R2+R3+R4), which corresponds to the low temperature limit Vlow.

[0033] During the operation of the LCD display screen 2, if it is detected that Vtemp < Vlow, the operational amplifier U1 outputs a high level at this time; if it is detected that Vtemp > Vhigh, the operational amplifier U1 outputs a low level at this time; if Vlow < Vtemp < Vhigh, the output state of the operational amplifier U1 remains the previous state.

[0034] The control unit 6 includes a resistor R6, a resistor R7, and a triode Q3. The output terminal of the operational amplifier U1 is grounded through the resistor R6 and the resistor R7 in sequence, and the connection point between the resistor R6 and the resistor R7 is electrically connected to the base of the triode Q3. The collector of the triode Q3 is set as the input terminal of the control unit 6 and is electrically connected to the voltage output terminal of the power supply V1 through the resistor RL, and the emitter of the triode Q3 is set as the output terminal of the control unit 6 and is grounded.

[0035] When the operational amplifier U1 outputs a high level, the triode Q3 conducts, and at this time, the inner layer heating wire is powered on and heated; when the operational amplifier U1 outputs a low level, the triode Q3 cuts off, and at this time, the inner layer heating wire is powered on and stops heating.

[0036] The implementation principle of an industrial low-temperature-resistant LCD display screen device in an embodiment of the present application is as follows: By setting an inner layer heating wire on the display driving board 1 and combining a temperature sensor 3 and a temperature control circuit, precise heating of the LCD display screen 2 is achieved, solving the problem that the performance of the LCD screen is poor in a low-temperature environment in the prior art. Specifically, the inner layer heating wire generates heat through power-on to heat the LCD display screen 2; the temperature sensor 3 monitors the temperature in real time, and the temperature control circuit controls the on-off state of the inner layer heating wire according to the output voltage of the temperature sensor 3, thereby achieving precise heating of the LCD display screen 2. This solution has the advantages of simple structure, low cost, and low energy consumption, and can effectively improve the stability and reliability of the LCD screen in a low-temperature environment.

[0037] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An industrial low-temperature resistant LCD display device, characterized in that: The device includes a display driver board (1) and an LCD display screen (2) disposed on the display driver board (1), and the display driver board (1) and the LCD display screen (2) are electrically connected; the display driver board (1) is provided with an inner electric layer heating wire, and the inner electric layer heating wire is configured as a thin and long wire; the display driver board (1) is also provided with a temperature sensor (3) and a heating control circuit electrically connected to the temperature sensor (3), and the inner electric layer heating wire is controlled to be connected to the heating control circuit.

2. The industrial low-temperature resistant LCD display device according to claim 1, characterized in that: The heating control circuit includes a window comparison unit (5), a control unit (6), and a power supply V2. The output terminal of the temperature sensor (3) is electrically connected to the input terminal of the window comparison unit (5), and the output terminal of the window comparison unit (5) is electrically connected to the control terminal of the control unit (6). The inner electric layer heating wire is equivalent to a heating resistor RL. One end of the heating resistor RL is electrically connected to the input terminal of the control unit (6), and the other end of the heating resistor RL is electrically connected to the voltage output terminal of the power supply V2. The output terminal of the control unit (6) is grounded.

3. The industrial low-temperature resistant LCD display device according to claim 2, characterized in that: The window comparison unit (5) includes an operational amplifier U1, an NMOS transistor Q1, and a PMOS transistor Q2. The voltage output terminal Vtemp of the temperature sensor (3) is electrically connected to the inverting input terminal of the operational amplifier U1 through a resistor R1. The voltage output terminal of the power supply V1 is grounded in sequence through resistors R2, R3, R4, and R5. The connection point between resistors R3 and R4 is electrically connected to the non-inverting input terminal of the operational amplifier U1. The output terminal of the operational amplifier U1 is electrically connected to the gate of the NMOS transistor Q1 and the gate of the PMOS transistor Q2. The drain of the NMOS transistor Q1 is electrically connected to the voltage output terminal of the power supply V1. The source of the NMOS transistor Q1 is electrically connected to the connection point between resistors R2 and R3. The source of the PMOS transistor Q2 is electrically connected to the connection point between resistors R4 and R5. The drain of the PMOS transistor Q2 is grounded. The output terminal of the operational amplifier U1 is set as the output terminal of the window comparison unit (5).

4. The industrial low-temperature resistant LCD display device according to claim 2, characterized in that: The control unit (6) includes a transistor Q3. The output terminal of the window comparison unit (5) is grounded in sequence through resistors R6 and R7. The connection point between resistors R6 and R7 is electrically connected to the base of the transistor Q3. The collector of the transistor Q3 is set as the input terminal of the control unit (6), and the emitter of the transistor Q3 is set as the output terminal of the control unit (6).

5. The industrial low-temperature resistant LCD display device according to claim 1, characterized in that: The inner electric layer heating wires have a serpentine, uniform wiring structure.

6. The industrial low-temperature resistant LCD display device according to claim 1, characterized in that: The LCD display screen (2) is fixedly connected to the display driver board (1) by welding.

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