Different Varieties of Computer or Television Monitors

Applied Tech Review | Wednesday, June 23, 2021

 

A monitor displays images and video in real-time, enabling users to interact with computers by activating and running their programmes at will.

FREMONT, CA: A monitor is a display device, similar to a television screen, that interprets and displays the visual output signal from the computer's graphics card. This enables users to view the display interface and interact with the computer via a mouse or keyboard. The evolution of display technology in various applications has been based on the same fundamental technology. Both television and computer monitors began using vacuum CRTs (Cathode Ray Tube).

Various types of monitors

CRT Monitors

[vendor_logo_first]This monitor required a more significant amount of power and electronics to operate. Much of the analogue circuitry was clumsy and took up considerable space. Additionally, the CRT requires a specific distance between the screen area and the electron guns at the neck's end. Thus, despite their weight, bulk, and harshness on the eyes, they have a decent viewing angle. The other obvious disadvantage is that it cannot be used as a laptop monitor.

LCD Monitors

LCD monitors have largely supplanted CRT monitors. They initially encountered performance issues with response times, but these issues were eventually resolved. Between two electrodes are placed liquid crystal molecules. The electrical charge applied to the electrodes determines the amount of light that can pass through the liquid crystal molecules. Backlighting is required on LCD monitors to illuminate the image for us to see. This backlighting technology has also evolved significantly. CFLs (Compact Fluorescent Lamps) were initially used. Unfortunately, the inverter boards used to power them were unreliable. Fortunately, the CFLs have been replaced with LEDs which has increased the reliability of LCD monitors significantly.

Below listed are the common types of Matrix LCD panels discussed.

IPS Panels: In-Plane Switching panels are developed to address the TN panels' limited viewing angles and low-quality colour. They are more common in professional environments as refresh rates are not the best for gaming. But in terms of image quality, it delivers excellent results. And, the price comes with a bit of extra. Answer times are faster than VA panels but slower than TN panels.

TN Panels: Consumers most frequently purchase Twisted Nematic panels. They provide reasonable response times at an acceptable price.

LED Monitors: Light Emitting Diode monitors are essentially LCDs with LED backlighting. Micro-LEDs are attracting the attention of television manufacturers. This is the process of arranging microscopic LEDs in an array to create the pixel itself.

Monitors with QLED technology: The backlight is converted to emit pure primary colours using QLEDs or Quantum Dot Displays. These semiconductor nanocrystals are encapsulated in a Quantum Dot layer to aid RGB colour filters in minimising light loss and colour crosstalk. Electro-emissive versions are currently undergoing testing. This means that when an electric current is applied to inorganic nanoparticles, a Quantum-Dot Light Emitting Diode forms a pixel (QD-LED). This would result in a display with excellent colour ranges and near-perfect black levels.

 

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