lcd screen for extreme environments
summary
The temperature has a great influence on the tft display. The normal operating temperature of the tft screen is -20°C~+70°C. Once the temperature exceeds this range, the tft screen will have problems such as display screen jitter, streaks, white spots and shadows. Some problems can be solved Recovery, but some are permanent damage, so the lcd screen in extreme environment needs special design.
1.How does the temperature affect the lcd display?
2.The first aspect: the influence of temperature on the TFT circuit.
3.The second aspect: the influence of temperature on the driver IC.
4.The third aspect: the influence of temperature on liquid crystal.
5.What temperature is a black liquid crystal?
6.The fourth aspect: the influence of temperature on other materials of LCD display
Industrial, outdoor sports, and transportation industries often require displays that can operate in extreme temperature environments. lcd displays typically offer an operating temperature range of -20°C to +70°C. If it is stored, it can withstand -30°C to +80°C. Of course, there will be some problems on the display screen at this temperature, such as yellowing of the screen, plaques, etc., and some problems are irreversible. A part of the LCD screen of Harmony Optoelectronics provides extreme temperature models with an operating temperature range of -30°C to +85°C.
How does the temperature affect the lcd display?
The influence of temperature on lcd screen mainly has four aspects: first, temperature has a great influence on the work of TFT, and second, the influence of temperature on the driver IC used in LCD display. The third aspect is the influence of temperature on liquid crystal, and the fourth aspect is the influence of temperature on other materials of the display.
The first aspect: the influence of temperature on the TFT circuit.
The TFT circuit of the liquid crystal display is made on the glass substrate, and the voltage and current characteristics of the semiconductor material will change at different temperatures. Usually, the lcd screen is designed to operate at an operating temperature range of -20°C to +70°C. It is normal to use the lcd display within this range. When it exceeds this range, the lcd screen may have screen jitter or abnormal display. This is caused by the abnormal operation of the TFT, and it will recover after the temperature returns to normal.
The second aspect: the influence of temperature on the driver IC.
The driver IC used by the LCD display is a complex circuit made on a silicon chip. When the temperature changes, the output of the driver IC will change, which makes the LCD screen display abnormal.
The third aspect: the influence of temperature on liquid crystal.
Liquid crystal is a substance that can be converted in crystalline state, liquid crystal state and liquid state. Now the liquid crystal used in LCD display is a prepared mixture, which will become crystalline state when it is lower than -30°C. At this time, the liquid crystal state shrinks in size and cannot move in an electric field. When the temperature is higher than +85°C, it will turn into a liquid state. At this time, the liquid crystal molecules no longer have the function of refracting light. After the temperature returns to normal, the liquid crystal will revert to the liquid crystal state. Liquid crystals will become viscous at low temperatures, and the rotation speed of liquid crystal molecules in the electric field will slow down, and we can see the phenomenon of smearing. Because the liquid crystal can no longer refract light at high temperature, when you are using an IPS display, the picture will become black.
What temperature is a black liquid crystal?
I believe you already have the answer, that is, when the temperature exceeds the conversion temperature of the liquid crystal, this situation will appear in the IPS display mode, and the LCD display will return to normal after the temperature drops.
The fourth aspect: the influence of temperature on other materials of LCD display
Lcd display is composed of many parts, polarizer and backlight are important components, polarizer will shrink under high temperature, and in serious cases will make lcd screen stretch and bend. There are many layers of film materials in the backlight, which are thinner than polarizers, and will shrink and deform at high temperatures, causing irreversible problems. Dew will condense under low temperature conditions, and different film materials will stick together, resulting in abnormal display.
conclusion
It is very important to choose the correct LCD display corresponding to the product use conditions. From the above analysis, we can see that if you choose an unsuitable LCD screen, your device may be damaged. A part of the LCD screen of Harmony Optoelectronics provides extreme temperature models with an operating temperature range of -30°C to +85°C, and the operating temperature can be extended to -40°C or even lower by adding a heating plate, and the heating plate can also provide you with the battery of the device provides better working conditions.
The temperature range specification is clearly the most important characteristic of a monitor in extreme hot/cold environments, as it determines whether your device will work in extreme environments. There are other factors including LCD technology and cost. Twisted Nematic (TN), Super Twisted Nematic (STN) and Film Compensated Super Twisted Nematic (FSTN) displays are low-end compared to IPS type displays.
Lcd display usually can only reach -20°C to +80°C, while the process of IPS mode lcd display is more complicated than that of TN and can operate at a more extreme temperature line. Cost is also an important factor to consider. Different LCD technologies, display formats and backlight options have different costs. Designers need to balance the performance and functionality they need with the available budget for the project.
Harmony Optoelectronics is a display manufacturer and touch screen supplier, if you choose LCD monitors for extreme temperature environments, please contact us, we have more than 10 years of experience in the LCD industry. Not only displays used under extreme temperature, we also have sunlight readable display, small lcd display, small oled display, round lcd display, etc. Our experts look forward to communicating with you.
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