In terms of application scope, display screens can be divided into industrial displays and consumer displays. (Related reading: ▶Industrial display screen VS ordinary display screen)

The working temperature environments of the two are different. The working temperature range of industrial displays is generally -30°C to +80°C, while the working temperature range of consumer displays is 0°C to 50°C. There are many factors that affect the working temperature of the display screen. Hot Display's technical team conducted in-depth research on the factors that affect the operating temperature of the display screen. They not only summarized the factors that affect the display temperature, but also included liquid crystal materials, drive circuits, drive voltages, packaging technology, display structure, etc. aspect.

Hot Display Technology engineers continued to adjust, improve, and test the aspects summarized above, and finally developed a manufacturing method for ultra-low-temperature LCD screens, which enables the LCD screen to operate at temperatures as low as -40°C.

1. Choose the right liquid crystal material

The choice of liquid crystal material is critical to performance in ultra-low temperature environments. It is necessary to use liquid crystal materials that can remain liquid at low temperatures and have low viscosity. For example, some specific proportions of mixed liquid crystal materials can maintain good fluidity and response speed at lower temperatures.

2. Use special drive circuit

In ultra-low temperature environments, standard drive circuits may not work properly. In order to ensure the normal operation of the LCD, the following methods can be used to improve the drive circuit:

• Heater: Add a heating element on the back or around the LCD screen to maintain the operating temperature of the liquid crystal material and drive circuit within an appropriate range through a temperature control system.

• Temperature compensation circuit: Design a special temperature compensation circuit to adjust the parameters of the driving signal according to the actual temperature to ensure the correct orientation and response of the liquid crystal molecules.

3. Increase response speed

The response speed of the LCD display will be significantly reduced at low temperatures, which will affect the display effect. This problem can be partially solved by optimizing the formulation of liquid crystal materials and using improved driving algorithms. In addition, increasing the driving voltage within a certain range can also improve the response speed of the liquid crystal.

4. Packaging technology

In order to reduce the direct impact of external low temperature on liquid crystal materials, better packaging technology can be used. Vacuum packaging or inert gas-filled packaging can isolate the liquid crystal material from the external environment to a certain extent, thereby improving low-temperature performance.

5. Multi-layer structure

In some applications, using a multi-layer LCD display structure can reduce heat loss by adding thermal insulation materials between the layers, allowing the liquid crystal material to operate in a more stable temperature range.

6. Preheating the LCD panel

When starting the LCD display in an extremely low temperature environment, the preheating method can be used, that is, before the display starts to work, the liquid crystal material is preheated to the appropriate operating temperature through the built-in heating element, and then the display operation is performed.

7. External heating method for small LCD monitors

Use a temperature sensor to monitor the temperature of the LCD screen and control its temperature within a certain range. Experiments have proved that this method is effective and can realize the normal operation of the liquid crystal display at a low temperature of -40°C.

Through the above methods and technologies, the performance and reliability of LCD screens in ultra-low temperature environments can be significantly improved to meet the needs of use in special environments. For example, these technologies are often used in military equipment, spacecraft, and polar expedition equipment to ensure that LCD screens work properly.

Some of Hot Display’s ultra-low temperature product catalogs are as follows:

4.3-inch 800x480 Px IPS display TFT LCD module Wide temperature Arduino display: -30℃~85℃

▶ Module: LCM-TFT043T1SVP16R40D

▶ Type: TFT module

▶ Display pixels: 800x480 Px

▶ Overall dimensions (mm): 121x70x7.76

▶Display inches: 4.3"

▶ Effective size (mm): 95.04x53.856

▶Application: Microcontroller/Arduino

▶Viewing angle: IPS full viewing angle

▶Brightness: 500cd/M²

▶ Pin: 40 PIN

▶ Interface: MCU

▶ Special instructions: Anti-static ESD 8KV

▶ Working temperature: -30~85℃

▶Power supply voltage: 5.0V

▶ Driver chip: SSD1963

▶ Read more

3.5-inch 640x480 pixels IPS TFT MIPI interface wide temperature application industrial equipment: -30℃~80℃

▶Model: TFT-H035B16VGIST4N30

▶ Type: TFT standard color screen

▶ Display pixels: 640x480

▶ Overall dimensions (mm): 76.90x63.90

▶ Diagonal size: 3.5"

▶ AA size (mm): 70.08x52.56

▶ Application: Industrial control equipment

▶Viewing angle: full view

▶ Backlight/brightness: 450cd/m2

▶ Pin: 30pin

▶Interface mode: MIPI

▶ Special instructions: Anti-static ESD 8KV

▶ Working temperature: -30~80℃

▶ Supply voltage: 3.3V

▶ Driver chip: ST7703

▶ Read more

1.7" 128X64 Graphic LCD Module | FSTN + White Edge Backlight Parallel Display Ultra Low Temperature -40°

▶ Model: HTM12864C-31W-N3S-V06

▶ Type: Standard COB LCD module

▶ Display pixels: 128x64

▶ Overall dimensions (mm): 39.0x40.8x6.2

▶ VA size (mm): 36x23.5

▶ AA size (mm): 33.25x20.45

▶ Point spacing (mm): 0.32x0.26

▶ Application: Industrial Control

▶Viewing angle: 6H

▶ Backlight/Brightness: Display black text

▶ Pin: 12PIN

▶Interface mode: SPI

▶ Special instructions: Anti-static ESD 8KV

▶ Working temperature: -40~70℃

▶Power supply voltage: 3.3v

▶ Driver chip: ST7567

▶ Read more

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