First, the EL (electroluminescent) backlight is a cold light source that excites phosphors to emit light through an alternating electric field. Its advantage is that it is very thin, which can be 0.2 to 0.6 mm, and is very suitable for industrial control environments with extremely strict space requirements. However, the brightness of the EL backlight is relatively low, and its service life is relatively short, generally between 3000 and 5000 hours, which limits its application in certain high-brightness and long-term use scenarios.
Secondly, the CCFL (cold cathode fluorescent lamp) backlight is another common industrial control LCD screen backlight. CCFL backlight has the advantages of high brightness, low cost, high efficiency, and long life, so it is widely used in some large-area, high-brightness industrial control display devices. However, the power consumption of CCFL backlight is relatively large, it needs to be driven by an inverter circuit, and the operating temperature range is narrow, generally between 0 and 60 degrees.
In addition, LED (light-emitting diode) backlight is the mainstream choice of industrial control LCD screen backlight in recent years. LED backlights have the advantages of high brightness, good uniformity, small size, long life, light weight, good color rendering and dimming performance. At the same time, LED backlights can also realize regional color and chromaticity adjustment functions, thereby providing more accurate color reproduction. However, the thickness of LED backlights is relatively large, generally more than 4 mm, and a large number of LEDs are used, which may cause significant heating.
In addition to the above three common types of backlights, there are some other types of backlights, such as OLED (organic light-emitting diodes). OLED backlights have the characteristics of self-luminescence, which can achieve higher contrast and wider color gamut, but the cost is relatively high, and the application in large-size industrial control LCD screens is still relatively limited.
There are many types of backlights for industrial control LCD screens, and each type has its own unique advantages and limitations. When choosing a backlight, it is necessary to make comprehensive considerations based on the specific application scenarios and needs.
