What are the Different Types of Displays?

Applied Tech Review | Thursday, July 15, 2021

Almost every human being on the planet currently carries a display embedded in a cell phone or smartphone device.

FREMONT, CA:  A display is an electronic device whose primary function is to serve as an interface for displaying the reading (information) produced by a computer or electronic circuit. The data could be in a text document, a photograph, or a video sequence of images.

Below are different types of displays.

Cathode Ray Tubes (CRT)

This type of display is large, heavy, and bulky. However, there is a rationale for this. It consists of an electron gun that beams electrons horizontally into millions of microscopic red, green, and blue phosphor-coated dots arrays. Finally, when the beam collided with the minuscule phosphor dots. They will glow, and the rapid beam exposure can create the illusion of moving pictures. Despite its heavy and bulky dimensions, the CRT screen was still the first choice and was owned in the twentieth century.

Liquid Crystal Display (LCD)

The twisted nematic effect principle is the mechanism by which it operates. The electric field can align the unique liquid crystal molecules in two states (voltage off and voltage on). When molecules are twisted and not aligned, this is called the off-state. There is no electric-potential applied to the molecules in this state. On the other hand, if a low voltage is applied to the molecules, the molecules will align. Later on, this effect is used to create basic numbers and letters. Typical displays at the time required 40v or more to operate. However, the LCD types consumed very little power and became the standard for wristwatches and pocket calculators until the advent of modern LCDs.

Matrix Display

It is also referred to as the LED display by the general public. The mechanism employed is identical to that used in the twisted pneumatic effect. However, it is applied to a larger scale and a distinct object in the form of a million-pixel LED. The OLED is constructed similarly using carbon-based molecules. The issue of managing millions of pixels on a screen is solved by three tiny transistors that control each pixel’s sub-pixels (red, green, and blue). In addition, the transistors adjust the brightness of each sub-pixel to represent a single colour. The combination of these will result in the creation of an image. The AMOLED (Active-Matrix OLED) display uses a rapid-fire mechanism to control one row at a time via the LED driver (transistors).

Multi-touch Display

It is classified as a resistive touch display or a capacitive touch display. Resistive touch display technology is used to describe displays that require force to be recognised, such as ATM screens and early PDAs (Personal Digital Assistants). It created considerable scepticism in the community and made it difficult to use. On the other hand, the capacitive-touch display makes use of the human finger like a conductor. When the fingers lightly touch the screen surface, the electrostatic charge changes. Electrostatic charges can then be measured, providing greater accuracy than the resistive-touch display mechanism.

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