What is a flat panel monitor

LCD (liquid Crystal Display), for many users may be a not a new term, but the history of this technology may be far more than we imagine-as early as the end of 19th century, the Austrian botanists found liquid crystal, that is, liquid crystals, This means that a substance also has the fluidity of liquids and some sort of arrangement of crystals. In the electric field, the arrangement of liquid crystal molecules will change. Thus affecting its optical properties, this phenomenon is called electro-optic effect. Using the electro-optic effect of liquid crystals, British scientists made the first LCD, or LCD, in the last century. Today's liquid crystal display is widely used in a fixed-line liquid crystal, if we microscopic to look at it, we will find it special like cotton stick. Compared with the traditional CRT, lcd not only small size, thin thickness (currently 14.1-inch machine thickness can be achieved only 5 cm), light weight, less energy consumption (1 to 10 micro-watt/square centimeter), low operating voltage (1.5 to 6V) and no radiation, no flicker and can directly match the CMOS integrated circuit. Because of its many advantages, LCD has entered the desktop application field since 1998.

The first operable LCD is based on dynamic scattering mode (dynamically scattering MODE,DSM), and the team led by the RCA company George Heilman developed this LCD. Hellman created Optet, a company that developed a series of LCDs based on this technology. In the December 1970, the rotating nematic effect of liquid crystals was registered as a patent in Switzerland by the Cyclamen and Holfrich Hoffmann-Le Rockwell Central Laboratory. James Forguson in 1969 at Kent State University in Ohio (Ohio University) discovered the rotating nematic effect of liquid crystals and registered the same patent in the United States in February 1971. In 1971 his company (Ilixco) produced the first LCD based on this feature, which quickly replaced the poorly performing DSM LCD.

1985 years later, the discovery produced commercial value, the first time Japan's company, in 1973, had used it to make digital displays of electronic calculators. LCD is now the main display device for laptops and PDAs, and it plays a very important role in projectors, and it is beginning to seep into the desktop display market.

LCD Features

Thin fuselage, space saving

Compared to the bulky CRT monitors, the LCD displays as much as One-third of the space in the former.

Save electricity, do not produce high temperature

It belongs to Low-power products, can be done completely without heat (the main power consumption and heating part of the existing in the backlight lamp or LED), and CRT display, because imaging technology inevitably produce high temperature.

Low radiation, health benefits

Liquid-crystal displays are far less radiant than CRT monitors (just low, not completely radioactive, with more or less radiation), a boon for people who work all day in front of a computer.

The screen is soft and doesn't hurt your eyes

Unlike CRT technology, the LCD screen will not blink, can reduce the damage to the eyes of the monitor, the eye is not easy to fatigue.

Classification

Liquid crystal display is a kind of display with liquid crystal as material. Liquid crystals are organic compounds that are between solid and liquid. Heating it into a transparent liquid, cooling will become crystalline turbid solid. In the electric field, the liquid crystal molecules will change in the arrangement, thus affecting the light through its changes, this light changes through the role of the polarizer can be reflected in the changes in the brightness. In this way, people through the control of the electric field eventually control the light and shade changes, so as to achieve the purpose of displaying the image.

According to the arrangement mode of the liquid crystal molecule, the common liquid crystal display is divided into: narrow angle of view tn-lcd,stn-lcd,dstn-lcd, wide angle ips,va,ffs and so on.

TN-LCD,STN-LCD and DSTN-LCD Three kinds of display principle is the same, only the liquid crystal molecule twist angle is different only.

TN: Twisted nematic (Twisted nematic) Liquid crystal molecule has a distorted angle of 90 degrees.

STN: Super Twisted nematic (Super TN) its s is the meaning of super, that is, the angle of the liquid crystal molecules increased, 180 degrees or 270 degrees, so as to achieve a more superior display (due to increased contrast).

DSTN: Double-layer STN (double). Its d is double layer, and therefore more superior than STN. Because the display panel structure of DSTN is more complex than that of TN and STN, the display quality is more exquisite.

resolution and monitor size

LCD display is widely used in industrial control, especially for some machines, the panel of complex control equipment, the display of medical devices and so on. I often used in industrial control and instrumentation of the LCD LCD display resolution: 320x240,640x480,800x600,1024x768 and above the resolution of the screen, the commonly used size of 3.9 ", 4.0", 5.0 ", 5.5", 5.6 ", 5.7", 6.0 ", 6.5", 7.3 ", 7.5", 10.0 ", 10.4", 12.3 "15" 17 "20" or even now yis. Color has black-and-white, pseudo-color, 512-color, 16-bit color, 24-bit color and so on.

Some users often confuse the resolution with the point distance, which is two distinct concepts. The resolution is usually expressed by the product of the horizontal pixel and the vertical pixel, the more the number of pixels, the higher the resolution. Therefore, the resolution is usually measured in pixels, such as: 640x480 resolution, the number of pixels is 307200.

Note: 640 is the number of horizontal pixels, 480 is the number of vertical pixels.

Because in the graphics environment, high resolution can effectively shrink the screen image, so, in the case of the screen size unchanged, its resolution can not cross its maximum reasonable limit, otherwise, it loses significance.

The size of a CRT monitor refers to the diagonal dimensions of the picture tube. The maximum viewable area is the maximum range in which the display can display graphics. The size of the picture tube is usually measured in inches (1 inches =2.54cm), 15 inches, 17 inches, 19 inches, 20 inches, and so on. The display area is less than the size of the display tube. The display area is represented by a long and high product, which is usually represented by the diagonal length of the visible part of the screen. The 15-inch display has a visual range of about 13.8 inches, and a 17-inch display is mostly visible in 15~16 inches, with a 19-inch monitor visible area of around 18 inches.

The size of the LCD display is the diagonal size of the LCD panel, in inches (1 inches =2.54cm), and now the mainstream is 15 inches, 17 inches, 19 inches, 21.5 inches, 22.1 inches, 23 inches, 24 inches, and so on.

Monitor size maximum resolution 14 "1024x768 15" 1280x1024 17 "1600x1280 21" 1600x1280 24 "1920x1080 (Full HD)