LCD for the people now is a very familiar term. Computers, LCD Display televisions, mobile phones, as well as the street a lot of large screen is the use of liquid crystal display to achieve the display function.
At the end of the nineteenth century, chemists found that some solid organic matter did not become directly liquid after heating, but in a certain temperature range between the solid and liquid, LCD Display and then into a liquid at high temperatures. LCD Display It is different from the liquid can flow freely, but also different from the regular order of the crystal, it has a structural characteristics between the two.
Because it is both mobile, LCD Display and similar to the optical and electrical properties of the crystal, so that this is a liquid crystal, LCD Display referred to as liquid crystal. LCD Display There are also views that the material state in addition to the most common solid, liquid, gas these three states, but also should be added to the two states of liquid crystal and plasma.
Now chemists have found that molecules capable of forming liquid crystal compounds tend to have specific geometries, common to long rod-like molecules with long rod-like structures and polar groups. In a certain temperature range, the long rod-like molecules of liquid crystals do not flow freely like liquid molecules, LCD Display but tend to arrange and flow in parallel with each other in the same direction. LCD Display The positional relationship between the liquid crystal molecules as if a bunch of loose toothpicks, are almost parallel to each other and toward the same direction, but the end is still uneven, unlike the crystal as strict and orderly.
The presence of polar groups in the liquid crystal molecules makes the internal charge appear unevenly distributed, resulting in the liquid crystal molecules become polar. The arrangement state of the liquid crystal molecules is changed by the influence of the applied voltage, LCD Display and the light is switched between light transmission and light transmission. Liquid crystal display is made using this phenomenon.
The liquid crystal into the two glass of the sandwich, LCD Display by adding voltage control liquid crystal molecules arranged in the state, you can output different shapes and shades of the image. LCD display with a thin structure, low power consumption and low operating voltage advantages, so soon out of the bulky cathode ray tube (CRT) display, as one of the mainstream display
The liquid crystal display in the vicinity of the human body temperature can be the best display contrast, LCD Display this temperature sensitivity is due to 5CB phase transition temperature of 35 ℃, close to the human body temperature caused. The researchers first use ultraviolet light to write specific image information to the display, first placed in room temperature (25 ℃) environment (Figure 3a), LCD Display and then placed in the palm of your hand 30s (Figure 3b), you can clear To see that the displayed image information has a higher contrast (Figure 3c). The above process can be repeated (Figure 3d-f), free from oxygen or moisture in the air. LCD Display These features make it a wide range of potential applications in intelligent communications equipment, wearable electronic equipment, bionic robots, and human physiological signal detection.