Types of.. LCD (TFT) Explained Part-2.1

T.Peter Brody

Early LCDs were having motion blur anything above 8fps they used passive matrix circuit to conduct electricity that uses a grid of conductive metal to activate each pixel. But all that was going to be removed in the year 1974 first flat Active Matrix LCD was demonstrated by T. Peter Brody and his colleagues at Westing house.






that demonstration made researchers and engineers jump into the field of LCDs and later in the year 1988 Sharp Corporation made the first TFT AMLCD display. Let's see what is TFT and how it works?

But first let's take a look at Active Matrix LCD, active matrix just like passive matrix is a circuit that supplies electricity to each pixel, Active matrix can handle high frame rates without blur and decreasing response time.
Now let's see How TFTs work?

TFT (Thin Film Transistor)

As it says in the name this type of display has a thin transistors attached to each pixel that controls the current for each pixel, they are arranged in a matrix on a glass substrate. To address a particular pixel, the proper row is switch ON, and then a charge i sent down the correct column. Since all of the other rows that the column intersects are turned off, only capacitor at the designed pixel receives a charge. The capacitor is able to hold the charge until the next refresh cycle. And if we carefully control the amount of voltage supplied to a crystal, we can make it untwist only enough to allow some light through.

TFTs removed a lot of cons of the the previous LCD displays 

Pros and Cons

• Pros

1. Increased viewing angles.
2. increased number of frame rates it can handle, making it more suitable for video games.
3. Decreased response time.

• Cons

1. Even with the improved viewing angles you can still see negative of image not that easily as with the previous displays but it was still there.
2. And because they are a LCD basically so they cannot create deep blacks.

In the 1990's TFTs were supplied to the PC industry making it portable and remember the Portable Macintosh it had a TFT LCD display.

this is the end of the article but types of LCD is not finished yet rest of it will be out tomorrow come back if you want to learn about IPS and Retina Display. 

and also i have made a video on Get To Know- Display so it you want to see that Link is 

here-https://www.youtube.com/watch?v=aHVEBThfC_U 

read the previous part of the Get To Know and learn more about 

CRTs-http://shekhar087tech.blogspot.in/2014/07/get-to-know-displays.html  and 

LCDs-http://shekhar087tech.blogspot.in/2014/07/get-to-know-displays-part-2-lcds.html

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