What is LCD (Liquid Crystal Display)

LCDs were a giant leap in Technology terms they replaced, which involved gas-plasma displays and light-emitting diodes (LED). LCD Display is much thinner than cathode ray tube (CRT) technology. LCDs use up much less power than LED and gas-plasma displays because they work on blocking the light principle instead of emitting it. LCD uses a backlight to produce an image, whereas the LED emits light

LEDs have many cases for their users and businesses but are commonly found in Smartphones, Televisions, Computer monitors, tablets, etc.

LCDs have been replaced by LEDs or other older display technologies but nowadays they have begun being replaced by the latest display technologies like OLEDs.

Definition

LCD stands for Liquid Crystal Display, a flat panel display that uses liquid crystals.

History:

How does it work

A display is a combination of millions of pixels. The Quality usually depends upon the number of pixels a model has, such as a 4K display is a combination of 3840×2160 or 4096×2160 pixels.

Subpixels made a pixel

Three subpixels made up a pixel; red, green, and blue—usually known as RGB. When the subpixels switch the color combination, a different color can be made.

Display colors

The Display can make millions of colors by using its pixels working together. When the pixels are rapidly swapped, a picture is produced.

Controlling ways of Pixels

The ways of controlling a pixel of all CRT, LCD, LED or any latest display technologies are different. The LCDs are illumined by a backlight, and pixel swaps electronically while using liquid crystals to swing polarized light.

Filters of LCD

In the front and behind of all the pixels, a polarizing glass filter is placed, and the front filter is placed typically at 90 degrees. The liquid crystals that can be switched on or off electronically are lies between both these filters.

LCDs Matrix

LCDs are made with any of an active matrix or a passive matrix display grid. The second name of active-matrix LCD is Thin Film Transistor (TFT) display. Otherwise, the passive-matrix LCD is a system with a grid of conductors with pixels located at each intersection. A current is sent across two conductors on the grid to manage the light for any pixel.

In an active matrix, each pixel intersection has a transistor located on it, that’s why they require less current to control the luminance of a pixel. This is why the current in an active-matrix display can be switched off or on very frequently and improves the refresh time of the screen.

Some of the passive matrix LCDs have dual scanning, which means that they can scan the grid two times with current at the same time, which it took for a single scan in original technology.

However, the active matrix is still more frequent and superior out of the two.

Types of LCD

• Twisted Nematic (TN)
  TN displays have low contrast ratios, viewing angles, and color contrasts but they have also high response times. However, they are inexpensive.
• In Panel Switching displays (IPS Panels)
  The IPS panels have better quality contrast ratios, viewing angles, and color contrast than TN displays.
• Vertical Alignment Panels (VA Panels)
  The VA panel’s quality in contrast ratios, viewing angles, and color contrasts are in the middle of TN and IPS displays.
• Advanced Fringe Field Switching (AFFS)
  The AFFS is on top of all other TN, IPS, and VA displays. It is a top performer and has the best quality in the color reproduction range.
  

Pros of LCD:

Cons of LCD:

Conclusion:

FAQ

Q: what is a pixel?

A: One of the small squares or Dots that build an image after combining, on the computer screen is a pixel.