The liquid crystal was first discovered by the Austrian botanist F. Reinitzer in 1888. When he measured the melting point of organic matter, he found that certain organic substances (cholesteric benzoate and acetate) melted and experienced a The opaque white turbid liquid state gives off a colorful and beautiful pearl luster that will only become a clear, clear liquid when heated to a certain temperature. The following year, the German physicist O. Lehmann used his own design to observe these lipid compounds as the latest polarized microscope with a heating device. He found that such white and turbid liquids, although liquid in appearance, exhibit birefringence characteristic of anisotropic crystals. So Lehman named it "liquid crystal", which is the origin of the name "liquid crystal".
Liquid crystal is an organic compound with a regular molecular arrangement between solid and liquid. The most commonly used liquid crystal type is nematic liquid crystal. The molecular shape is slender rod shape, and the length and width are about 1 nm to 10 nm. Under the action of the electric field, the liquid crystal molecules will be regularly rotated by 90 degrees to produce a difference in transmittance, so that the difference between light and dark is generated under the power ON/OFF, and each pixel is controlled according to this principle to form a desired image.
LCD is the abbreviation of Liquid Crystal Display in English, which is a digital display technology. It can filter light source through liquid crystal and color filter to produce image on flat panel. Compared with the traditional cathode ray tube (CRT), the LCD has a small footprint, low power consumption, low radiation, no flicker, and reduced visual fatigue. Insufficient: The price is more expensive than the same size CRT.
After years of leading the notebook market, smooth display screens based on liquid crystal display technology are gradually entering the desktop market. LCD has many advantages that traditional CRT display technology does not have, can provide a clearer text display, and the screen is flicker-free, which can effectively reduce the visual fatigue caused by watching the screen for a long time. LCD monitors typically have a thickness of no more than 10 inches, so if the desktop system uses LCD technology, it will save more space. Although LCD displays have their own unique features, it is undeniable that compared with the main competitor CRT monitors, LCDs still have shortcomings in high-quality color display. In addition, the price difference between the LCDs is still only A luxury product enjoyed by a few people.
What is LCMLCM English full name Liquid Crystal Display Module, that is, LCD display module, liquid crystal module, refers to the components of the liquid crystal display device, connectors, control and drive peripheral circuits, PCB circuit boards, backlights, structural parts, etc.
LCD is the abbreviation of Liquid Crystal Display. It is a display.
The LCD is a display screen (lcd liquid crystal panel), and the LCM is a collection of various devices including a LCD, a chip for controlling the display mode and content of the LCD, and a circuit board. It can be said that the LCD is the foreground for displaying content, and the LCM is the entire operating system including the foreground.
1, LCD = Liquid Crystal Display
2, mainly refers to: the LCD panel, including polarizers, color filters, liquid crystal glass (glass clip LCD), TFT control
3, LCM = Liquid Crystal Module
4, including: LCD panel and the following accessories, mainly backlight module, with brightness enhancement film, light transmission film, reflective film, diffusion film, bracket, LED light (light source), FPC and component devices
5. But in fact, in general, both are treated as the same meaning.
The main differences between LCD and LCM are:1, LCM with word library; LCD basically does not have a font.
2, LCD is a liquid crystal display, generally refers to a separate screen; LCM is a liquid crystal display module, which includes a corresponding drive circuit and control circuit, which can be directly connected to the single chip microcomputer.
The LCD module is simply a LCD screen + LED backlight + PCB board + iron frame. The module is mainly divided into screen and backlight components. The two parts are assembled together, but they are independent of each other (ie, the circuit is not relevant). The principle of liquid crystal display is that the backlight assembly emits a uniform surface light, and the light is transmitted to our eyes through the liquid crystal screen. The function of the screen is to process the light by pixel to display the image.
Spring-type terminals are new types of spring-type terminals, which have been widely used in the world's electrical and electronic engineering industries: lighting, elevator control, instrumentation, power, chemistry, and automotive power.
If the terminal block is black, one of the possibilities is not necessarily burning black, oxidation may also be black. So how to verify whether it is burnt black? The method we take is to wipe it with a finger. If it can be wiped off, like soot, it is the black substance formed by oxidation, which can only be ground off with sandpaper or a file.
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