LCDs displays does not radiate any illumination. It only reflects or transmits illumination.It’s a field effect device and the key to its operation is the liquid crystal or organic fluid sandwitched between two glass plates.
When an ac voltage is applied across the fluid from the top metallized segments to the metallized back plane.
When affected by the magnetic field of ac voltage, the fluid transmits light differently and the energized element appears as black on a silvery background. It uses a polarizing filter on the top and bottom of the display resulting in a crystal-clear display.
Liquid crystal is an organic fluid, sealed between two glass sheets having a transparent conducting surface. When a low frequency voltage is applied, the crystal molecules rearrange their orientation to produce the display.
While there are several different configurations for LCD displays, most are designed in the same basic manner. They work by using liquid crystals to produce an image. The liquid crystals are embedded into the display screen, and there’s some form of backlight used to illuminate them. The actual liquid crystal display is made of several layers, including a polarized filter and electrodes. When the backlight is activated, it produces light that is somewhat obstructed by the liquid crystals. And this obstruction is essentially what creates the images we see in LCD displays.
Of course, a backlight is an essential component of an LCD display. Without a backlight, an LCD display wouldn’t be able to produce the visible images. Some of the most common types of backlights used in LCD displays include the following:
Cold cathode fluorescent lamps (CCFL)
EL-WLED array
WLED array
RGB-LED array
Benefits of LCD Displays
There are several benefits associated with LCD displays, one of which is the simple fact that they do not suffer from image burn-in. Commonly found in other electronic displays, image burn-in is a phenomenon that occurs when the image remains in the display after it has been changed. If the user pauses or otherwise leaves the image on the screen for a long period of time, it may become “burned into” the display. Thankfully, this isn’t a problem with LCDs, as they don’t use phosphorus compounds.
It’s also worth mentioning that LCD displays are significantly thinner and more compact than traditional CRT monitors. This is why you see so computer monitors using LCD technology instead of the now-dated CRT technology. Furthermore, LCD displays offer a sharp image resolution with no bleeding, assuming they are operated at native resolution. Finally, LCDs aren’t affected by the Earth’s magnetic field, which is something that cannot be said about other electronic displays.
What’s the main difference between LCD and LED displays?
Actally both are same, just the difference is a LCD Monitor uses fluorescent lamp for the backlight. But a LED monitor uses series of led bulbs/diodes for the backlight.LCD is quite an old technology in terms of present one & it consumes more electricity as well as emits more heat but LED monitors consumes less electricity and they’re brighter than LCD.
You won’t find LCD monitors normally in market these days, just buy a LED monitor as per your needed size.