DISPLAY TECHNOLOGIES

In the past we have only C.R.T as a display technology but with the inventions of LCD and OLED the monopoly of C.R.T has been vanished and now it is only used as refernce for maintaing standards.In this article we will go from the LCD to latest display technologies and I will let you know your mobile display technologies.

LCD DISPLAY :

LCD displays utilize two sheets of polarizing material with a liquid crystal solution between them. An electric current passed through the liquid causes the crystals to align so that light cannot pass through them. Each crystal, therefore, is like a shutter, either allowing light to pass through or blocking the light.

Their are two types of LCD:

LCD Applicatios: mobile,Monitor,Television

1. T.F.T: With Thin Film Transistor (TFT) LCDs, each pixel is controlled by one to four transistors. Typically one transistor is used for each of the RGB colour channels.

• Wider viewing angle range.
• Provides more accurate color control.

2. S.T.N:

Super Twisted Nematic(STN) LCDs, Pixels are controlled by energising the appropriate row and column drive lines of the matrix from outside the display, resulting in a slow frame rate.

• Use passive matrix technology.

• Limited viewing angle.

APPLICATIONS: used in mobiles,monitor screen,laptop,televison

PROS of LCD:

 Require Less Power : LCD consumes less power as compare to the CRT .

Smaller and weigh Less : They are light in weight and comes in different sizes tus giving customer wide range of products.

Adjustable : They are not bulky in size and can be adjusted according to the users requirement .You can tilt , adjust height from horizontal to vertical.

Less Eye strain : LCD displays each pixel off individually, so LCD Displays don't have flickering problems and offer customer a soothing experience.

CONS of LCD:

Less viewing angle range.

Less responsive time.

Fragile in nature.

List of Mobiles using LCD Screen:

HTC Sensation XELG, Optimus 3D, LG Optimus Black.

PLASMA:

The central element which is reponsible for emitting light in tihs technology is Plasma which is a gas made up of free flowing ions and and electrons.When electric voltage is applied across the positively charged ion moves towards negative electrode and negatively charged ion moves towards positive electrode during this they strike with other particle and this will results in emission of photons and you get desired image on your screen.

You can understand the working by the following diagram:

Add caption

PROS of Plasma technology:

Wider viewing angles means you can view monitor from any viewing angle it is not necessary to sit in front of it

High contrast ratio.

Preproduction of colours through pixels is excellent.

CONS of Plasma technology:

Prone to screen burn-in problem.

Have short lifespan.

Plasma screen are Heavier than LCD screen.

APPLICATIONS: used in television,mobiles,monitors.

OLED:

Organic Light Emitting Diode

OLED technology was invented by Eastman Kodak in the early 1980s.In this technology an organic polymer is used .The organic polymer used is made of carbon.This organic semiconductor material is situated between the electrodes. When electric current is passed emission of light occurs.

Features of OLED:

• Wider viewing angle.

• Fast response rate and brighter colour display.

 

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