Adaptive high or low temperature liquid crystal display module circuit

Abstract

The utility model discloses a kind of liquid crystal display module circuits of self-adapting high temperature or low temperature, including the environmental temperature monitoring circuit for external environment temperature acquisition, the temperature value determination circuit being connected with the environmental temperature monitoring circuit, the heating sheet energization circuit being connected with the temperature value determination circuit and starting after environmental temperature monitoring circuit detects temperature lower than preset value, the LCD drive circuit being connected for output with the temperature value determination circuit, the LCD drive circuit is connected with the external interface circuit for input. By using the above structure, customers can automatically adapt to the ambient temperature without changing the hardware, automatically adjust the display effect of the LCD, so that the liquid crystal display module can achieve the best display in both high temperature and low temperature environments. This shortens the development cycle of new projects on the client side and expands the application range of the liquid crystal display module.

Description

Technical Field

[0001] This utility model relates to a liquid crystal display module circuit that adapts to high or low temperatures, and more particularly to a liquid crystal display module circuit that adapts to high or low temperatures from -50℃ to 80℃. Background Technology

[0002] Liquid crystal displays (LCDs) are limited by the physical characteristics of liquid crystals (requiring lower driving voltages at high temperatures and higher driving voltages at low temperatures). When the ambient temperature changes, the display effect of LCDs exhibits phenomena such as deep shadows at high temperatures and slow response times and pale displays at low temperatures. This restricts the application of LCD modules in environments with large temperature variations.

[0003] Currently, similar products on the market typically use a single heating element to heat the water, or simply adjust the voltage to change the effect, failing to achieve full temperature range coverage. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a liquid crystal display module circuit that is adaptive to high or low temperature, and adapts to use environments ranging from -50℃ to 80℃, thereby greatly improving the versatility and application range of the liquid crystal display module.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: an adaptive high-temperature or low-temperature liquid crystal display module circuit, the innovation of which is: the adaptive high-temperature or low-temperature liquid crystal display module circuit includes an ambient temperature monitoring circuit for acquiring external ambient temperature, a temperature value determination circuit connected to the ambient temperature monitoring circuit, a heating element energizing circuit connected to the temperature value determination circuit and activated after the ambient temperature monitoring circuit detects that the temperature is lower than a preset value, and an LCD driving circuit connected to the temperature value determination circuit for output, wherein the LCD driving circuit is connected to an external interface circuit for input.

[0006] Preferably, the ambient temperature monitoring circuit includes a U3 processor for identifying the external ambient temperature. The U3 processor is an AHT20, and it converts the temperature into a digital signal and feeds it back to the temperature value determination circuit.

[0007] Preferably, the U3 processor is provided with a resistor RU1 located on the input pin of the U3 processor, and the U3 processor is provided with a resistor RU2 located on the SCL pin of the U3 processor and a resistor RU3 located on the SDA pin of the U3 processor.

[0008] Preferably, the temperature value determination circuit is a U2 processor, the model of which is STC8G1K08. The SDA pin on the U2 processor is connected to the ambient temperature monitoring circuit, and the U2 processor is provided with a pin EN1 that is connected to the heating element power supply circuit.

[0009] Preferably, the heating element power-on circuit includes a processor U1 and a heating element HT1 disposed between the SW pin and the VSS pin on the processor U1. The processor U1 is of model LP6216. The processor U1 is provided with a pin EN connected to the temperature value determination circuit. When the ambient temperature obtained by the temperature value determination circuit is lower than the preset value, it feeds back a start signal to the pin EN.

[0010] Preferably, the heating element power-on circuit is provided with an inductor LE1 located between the VIN pin and the SW pin on the processor U1, and a diode D1 connected in series with the inductor LE1 is provided between the SW pin and the heating element HT1.

[0011] Preferably, the heating element HT1 is provided with a capacitor CA2 connected in parallel with the heating element HT1, and an inductor RA2 and an inductor RA3 connected in parallel with the heating element HT1 and connected in series with each other. An adjustable resistor RV1 is connected in parallel to the inductor RA2, and one end of the adjustable resistor RV1 connected to the inductor RA3 is connected to the pin FB on the processor U1.

[0012] Preferably, the LCD driving circuit includes a processor U4, which is an ST7586 processor. The specific output voltage of the LCD driving circuit is set by the value of the ambient temperature monitoring circuit.

[0013] Preferably, the external interface circuit includes an input interface terminal CON1 and an adjustable resistor RP1 connected to the input interface terminal CON1, wherein the adjustable resistor RP1 is connected to the LCD driving circuit.

[0014] Preferably, the input interface terminal CON1 is provided with a filtering processing module located between the input interface terminal CON1 pins VSS and VDD;

[0015] The filtering module includes a resistor RZ1, a transient diode T1 connected in series with the resistor RZ1 and connected in parallel with each other, a capacitor C1, a capacitor C2 and a resistor R1, and a resistor RZ2 connected in series with the transient diode T1 connected in parallel.

[0016] The input interface terminal CON1 is provided with a backlight brightness control module located between pins K and A of the input interface terminal CON1. ​​The backlight brightness control module includes a diode BL, a resistor R3 connected in series with the diode BL and a resistor R4 connected in parallel with each other.

[0017] The advantages of this invention are as follows: By adopting the above structure, customers can automatically adapt the LCD module to the ambient temperature and adjust the LCD display effect without changing the hardware, ensuring optimal display performance in both high and low temperature environments. This shortens the development cycle of new projects for clients and expands the application range of the LCD module. It also achieves automatic adjustment of contrast voltage and ambient temperature, ensuring optimal display performance in both high and low temperature environments. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a flowchart of a liquid crystal display module circuit that adapts to high or low temperatures according to this utility model.

[0020] Figure 2 This is a schematic diagram of the structure of a liquid crystal display module circuit that adapts to high or low temperatures according to this utility model.

[0021] Figure 3 This is a schematic diagram of the ambient temperature monitoring circuit in an adaptive high-temperature or low-temperature liquid crystal display module circuit according to this utility model.

[0022] Figure 4 This is a schematic diagram of the temperature value determination circuit in an adaptive high-temperature or low-temperature liquid crystal display module circuit according to this utility model.

[0023] Figure 5 This is a schematic diagram of the heating element energizing circuit in an adaptive high-temperature or low-temperature liquid crystal display module circuit according to this utility model.

[0024] Figure 6 This is a schematic diagram of the LCD driving circuit in an adaptive high-temperature or low-temperature liquid crystal display module circuit according to this utility model.

[0025] Figure 7 This is a schematic diagram of the external interface circuit in an adaptive high-temperature or low-temperature liquid crystal display module circuit of this utility model.

[0026] In the diagram: 1-Ambient temperature monitoring circuit, 2-Temperature value determination circuit, 3-Heating element power-on circuit, 4-LCD driving circuit, 5-External interface circuit. Detailed Implementation

[0027] This utility model's adaptive high-temperature or low-temperature liquid crystal display module circuit includes an ambient temperature monitoring circuit 1 for acquiring external ambient temperature, a temperature value determination circuit 2 connected to the ambient temperature monitoring circuit 1, a heating element energizing circuit 3 connected to the temperature value determination circuit 2 and activated after the ambient temperature monitoring circuit 1 detects that the temperature is lower than a preset value, and an LCD driving circuit 4 connected to the temperature value determination circuit 2 for output. The LCD driving circuit 4 is connected to an external interface circuit 5 for input. By adopting the above structure, customers can automatically adapt the liquid crystal display module to the ambient temperature and automatically adjust the LCD display effect without changing the hardware, enabling the liquid crystal display module to achieve optimal display in both high-temperature and low-temperature environments. This shortens the development cycle of new projects for clients and expands the application range of the liquid crystal display module. It achieves automatic adjustment of contrast voltage and automatic adjustment of the temperature around the liquid crystal display module, enabling the liquid crystal display module to achieve optimal display effect in both high-temperature and low-temperature environments.

[0028] The ambient temperature monitoring circuit 1 of this utility model includes a U3 processor, model AHT20, which identifies the external ambient temperature. The U3 processor converts the temperature into a digital signal and feeds it back to the temperature value determination circuit 2. The U3 processor has a resistor RU1 located on its input pin, a resistor RU2 located on its SCL pin, and a resistor RU3 located on its SDA pin. The U3 processor (AHT20) identifies the external ambient temperature and converts it into a digital signal. Resistor RU1 limits the current to the input power supply, while resistors RU2 and RU3 pull up the SDA and SCL pins, respectively.

[0029] The temperature determination circuit 2 mentioned above is a U2 processor, model STC8G1K08. Pin SDA on the U2 processor is connected to the ambient temperature monitoring circuit 1, and pin EN1 on the U2 processor is connected to the heating element power-on circuit 3. The specific output voltage of the LCD driver circuit 4ST7586 is set based on the value from the ambient temperature monitoring circuit 1AHT20 to ensure the LCD display effect.

[0030] The heating element power-on circuit 3 of this utility model includes a processor U1 and a heating element HT1 disposed between the SW and VSS pins of the processor U1. The processor U1 is model LP6216. The processor U1 has a pin EN connected to the temperature value determination circuit 2. When the ambient temperature obtained by the temperature value determination circuit 2 is lower than a preset value, it feeds back a start signal to the pin EN. The heating element power-on circuit 3 has an inductor LE1 located between the VIN and SW pins of the processor U1. A diode D1 connected in series with the inductor LE1 is disposed between the SW pin and the heating element HT1. A capacitor CA2 connected in parallel with the heating element HT1, and inductors RA2 and RA3 connected in parallel with and in series with the heating element HT1 are disposed at both ends of the heating element HT1. An adjustable resistor RV1 is connected in parallel with the inductor RA2. The end of the adjustable resistor RV1 connected to the inductor RA3 is connected to the FB pin of the processor U1.

[0031] When the external temperature reaches the preset value, the operating state of processor U1 (LP6216) is controlled by adjusting the EN pin on the heating element energizing circuit 3. Inductor LE1 and diode D1 increase the voltage or current of processor U1, while the change in the resistance of adjustable resistor RV1 indirectly controls the output of processor U1.

[0032] The LCD driver circuit 4 of this invention includes a processor U4, model ST7586, which controls a 240x160 DOTS display dot matrix. Customers can customize the display content. The specific output voltage of the LCD driver circuit 4 is set by monitoring the ambient temperature of the ambient temperature monitoring circuit 1.

[0033] The aforementioned external interface circuit 5 includes an input interface terminal CON1 and an adjustable resistor RP1 connected to the input interface terminal CON1. ​​The adjustable resistor RP1 is connected to the LCD driving circuit 4. A filtering module is located between pins VSS and VDD of the input interface terminal CON1 on the input interface terminal CON1. ​​The filtering module includes a resistor RZ1, a transient diode T1 connected in series with and in parallel with the resistor RZ1, capacitors C1 and C2, and a resistor R1, and a resistor RZ2 connected in series with the parallel transient diode T1. A backlight brightness control module is located between pins K and A of the input interface terminal CON1 on the input interface terminal CON1. ​​The backlight brightness control module includes a diode BL, and resistors R3 and R4 connected in series with and in parallel with the diode BL. The adjustable resistor RP1 is connected to the input interface terminal CON1. ​​The input voltage is filtered by resistors RZ1, RZ2, transient diode T1, capacitors C1 and C2, and resistor R1; the backlight brightness is controlled by resistors R3 and R4.

[0034] This invention, through processor U1, adjustable resistor RV1, and supporting circuitry, maintains the ambient temperature around the LCD module at 25℃; processor U3 and supporting circuitry collect external environmental parameters; processor U2 sets the voltage of the LCD module to automatically adjust the LCD display effect; and processor U4 and supporting circuitry drive the LCD module to display the image. This achieves optimal performance for the LCD module by adapting to ambient temperature. This invention exhibits high contrast and excellent display quality within a temperature range of -50℃ to +80℃. It is suitable for various locations and applications, expanding the application range of LCD modules, and is applicable to harsh environments with high display quality requirements.

[0035] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can make many modifications and variations to some of the technical features based on the content of this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A liquid crystal display module circuit that adapts to high or low temperatures, characterized in that: The adaptive high-temperature or low-temperature liquid crystal display module circuit includes an ambient temperature monitoring circuit for acquiring external ambient temperature, a temperature value determination circuit connected to the ambient temperature monitoring circuit, a heating element power-on circuit connected to the temperature value determination circuit and activated after the ambient temperature monitoring circuit detects that the temperature is lower than a preset value, and an LCD driving circuit connected to the temperature value determination circuit for output. The LCD driving circuit is connected to an external interface circuit for input.

2. The adaptive high-temperature or low-temperature liquid crystal display module circuit as described in claim 1, characterized in that: The ambient temperature monitoring circuit includes a U3 processor for identifying the external ambient temperature. The U3 processor is an AHT20 model. The U3 processor converts the temperature into a digital signal and feeds it back to the temperature value determination circuit.

3. The adaptive high-temperature or low-temperature liquid crystal display module circuit as described in claim 2, characterized in that: The U3 processor is provided with a resistor RU1 located on the input pin of the U3 processor, a resistor RU2 located on the SCL pin of the U3 processor, and a resistor RU3 located on the SDA pin of the U3 processor.

4. The adaptive high-temperature or low-temperature liquid crystal display module circuit as described in claim 1, characterized in that: The temperature value determination circuit is a U2 processor, the model of which is STC8G1K08. The SDA pin on the U2 processor is connected to the ambient temperature monitoring circuit, and the U2 processor has a pin EN1 that is connected to the heating element power supply circuit.

5. The adaptive high-temperature or low-temperature liquid crystal display module circuit as described in claim 1, characterized in that: The heating element power-on circuit includes a processor U1 and a heating element HT1 disposed between the SW pin and the VSS pin on the processor U1. The processor U1 is model LP6216. The processor U1 is provided with a pin EN connected to the temperature value determination circuit. When the ambient temperature obtained by the temperature value determination circuit is lower than the preset value, it feeds back a start signal to the pin EN.

6. The adaptive high-temperature or low-temperature liquid crystal display module circuit as described in claim 5, characterized in that: The heating element power-on circuit is provided with an inductor LE1 located between the VIN pin and the SW pin on the processor U1, and a diode D1 connected in series with the inductor LE1 is provided between the SW pin and the heating element HT1.

7. The adaptive high-temperature or low-temperature liquid crystal display module circuit as described in claim 6, characterized in that: The heating element HT1 is provided with a capacitor CA2 connected in parallel with the heating element HT1, and an inductor RA2 and an inductor RA3 connected in parallel with the heating element HT1 and connected in series with each other. An adjustable resistor RV1 is connected in parallel with the inductor RA2. One end of the adjustable resistor RV1 connected to the inductor RA3 is connected to the pin FB on the processor U1.

8. The adaptive high-temperature or low-temperature liquid crystal display module circuit as described in claim 1, characterized in that: The LCD driving circuit includes a processor U4, model ST7586, which sets the specific output voltage of the LCD driving circuit by monitoring the ambient temperature.

9. The adaptive high-temperature or low-temperature liquid crystal display module circuit as described in claim 1, characterized in that: The external interface circuit includes an input interface terminal CON1 and an adjustable resistor RP1 connected to the input interface terminal CON1. ​​The adjustable resistor RP1 is connected to the LCD driving circuit.

10. The adaptive high-temperature or low-temperature liquid crystal display module circuit as described in claim 9, characterized in that: The input interface CON1 is equipped with a filtering module located between pins VSS and VDD of the input interface CON1. The filtering module includes a resistor RZ1, a transient diode T1 connected in series with the resistor RZ1 and connected in parallel with each other, a capacitor C1, a capacitor C2 and a resistor R1, and a resistor RZ2 connected in series with the transient diode T1 connected in parallel. The input interface terminal CON1 is provided with a backlight brightness control module located between pins K and A of the input interface terminal CON1. ​​The backlight brightness control module includes a diode BL, a resistor R3 connected in series with the diode BL and a resistor R4 connected in parallel with each other.

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