What is the LCD monitor?

LCD monitor is a thin, light computer monitor that displays images using a liquid crystal display. LCD screens are located in most computers with laptops and in flat panel monitors and replaced the traditional Cathode rays (CRT) monitors for many users. CRT once preferred many users with their excellent color presentation; Improvements in LCD caused the difference to be less noticeable, but still important for professionals in graphics and photography and serious amateurs.

inside LCD

Color monitor usually consists of five layers: backlight, polarized glass leaf, colored pixel mask, grid layer of responsive liquid crystal and second polarized leaf of glass. The images are created by handling the orientation of crystals through precise electrical charges from different stages and voltages. They behave like small closures, opening or closing in response to the stimulus, allowing the degrees of light that have Passsed via specific colored pixels for the OSVScreening of the screen.

As LCD technology has evolved, various color production techniques have emerged. Passive screens of matrix, which were the first invented, use two transistors - one for each row and one for each pixel column - to activate a specific point on the LCD grid. Screens Active-Matrix usually uses thin film technology (TFT), in which each point on the grid has its own transistor; This allows you to activate only the required pixels. Passive matrix screens tend to respond more slowly than active matrix screens and are unable to create the same level of image quality.

Monitor specification

Most modern computer monitors LCD uses active matrix technology. There are a number of specifications in this group that distinguish one LCD monitor from another. Size, aspect ratio and resolution are related features; Are also importantContrast ratio, brightness, point of view and response time.

LCD monitor size can affect its price, resolution and aspect ratio. Larger monitors are more expensive; Transistors used to create active matrix displays have a high level of failure, and since larger monitors have multiple transistors, consumers pay partly for those that are defective and cannot be sold. The aspect ratio refers to the shape of the screen, with standard screens usually a 4: 3 or 5: 4 ratio. Wide -angle monitors tend to be larger, but allow you to display images in 16: 9 (or 16:10).

A larger screen can also allow a higher native resolution or the number of pixels that can display. The high native resolution screen will be very sharp and will be able to display more information than with lower resolution. Most monitors may show different resolution than native, but the image may seem blurred.

Contrast ratio concerns the comparative difference in the display among the most clearFar white values ​​and darkest black. The higher contrast ratio will have true colors with less washing and allow a larger range of shades. The standard offer for models with a lower end is usually 350: 1, but many experts recommend a contrasting ratio of 500: 1 or better.

LCD monitors tend to be clear, with standard levels are more than sufficient for everyday use. The brightness is measured in Nits, units of one candle per square meter. It is standard anywhere from 250 to 300 threads, although people who play games can benefit from a clearer screen. If the thread is much higher, the user is likely to end up adjusting the brightness for regular use.

Specifications of vertical and horizontal angles of observation relate to a level that the viewer can get lost from the dead center before the image begins to float. Most monitors look straight, but wider angles can benefit people who use multille screens, or if the screen is used by several people at the same time. Many experts inIt instructs the angle of observation at least 140 ° horizontal and 120 ° vertical, but the wider tracking angles, the better.

The

response time is measured in milliseconds (MS) and refers to how long it takes pixels to change from completely white to black and back. Smaller values ​​represent a faster response time and are desirable, especially for playing games and viewing videos. If the response time is slow, there may be scary or cobbing with fast moving images, where the images persist how the screen refreshes. The maximum response time should not be more than 25 ms for general use and 17 ms is better. Many players report no scary use of LCD monitor with a response time of 16 ms or less.

advantages

One of the main advantages of LCD monitors is their size; They usually have a thickness of 1 to 3 inches (2.5 to 7.5 cm) and weigh less than £ 10 (4.5 hp). CRT monitors, on the other hand, to have a depth of five times larger and a weight of 30 to £ 50 (£ 13 to 23 kilograms) or more. LCDS can occupy90% less space and it is much easier to move or adjust.

There is a wide range of screen size from 15 to 30 inches (38.1 to 76.2 cm) or larger. For average size - 22 to 24 inches (55.88 to 60.96 cm) - the price of the LCD monitor is approximately the same as the traditional CRT. LCD screens, however, tend to endure longer; In addition, if several pixels on the screen fail, the monitor is still usable in most cases.

LCD use relatively low electricity, especially compared to their counterparts CRT and produce much less heat. They also emit very low levels of electromagnetic radiation. LCD monitors are also easier in the eyes; Usually shiny or matte screens are available and matt screens reduce glare.

disadvantages

LCD monitors have largely displaced CRTs in most monitors, except for very cheap and very expenditure models. CRTs can still offer better color content and top level depth and also have the advantage of multisYNC or the ability to maintain colors consistent even if the image resolution changes. Colors on LCD can also change the shade when the viewer moves to the outer angle limits, especially on the display with narrow angles and low contrast ratios. Experts on graphics, photography and design, as well as healthcare professionals, usually preferred CRT monitors for these benefits.

The potential weak connection of the LCD monitor is backlight. Since liquid crystals do not create any light in themselves, if the backlight fails, the monitor is unusable. Many monitors come with a three -year warranty, but set one year for backlight.