Get To Know- Displays Part-3 (LEDs)

LED tv's are the most popular line of televisions but if we get inside a LED tv it's pretty much same as the LCDs, let see how LCD works.

LED (Light Emitting Diode)

If you want to know all the details read the Get To know- Displays Part-2 LCDs links is 

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

I am just going to tell what the difference between LCD and LED ?

LEDs have all the components same as the LCDs,two polarizers right angled to each other Liquid crystals and everything else is the same except the backlighting LCD's use CCFLs(Cold Cathode Florescent Lapms) LEDs use LED backlighting.
But that little detail can make a huge difference, LEDs as we know require very little amount of power and also LEDs are more durable than CCFLs, so LED TVs can last longer than LCDs.

And this is all you need to know about LEDs. lets get to OLEDs now.

In January 2012 LG launched the worlds first OLED TV, with a 55" display, 4mm thick and weighing only 3.5Kgs , OLEDs are a different they work on a totally different principle.

This is the end of this article, Last part of the article will be online soon.

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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Types of LCD Explained Part-2.2 ( IPS, Retina Display)

TFT's improved LCD's in many ways like increased viewing angles and increasing the fps  making it more suitable for gaming but even the new improved LCD (TFT) had it's flaws, Read all about TFT's in previous part of the Get To Know- link is
here - http://shekhar087tech.blogspot.com/2014/07/get-to-know-displays-part-21-types-of.html
and to remove all that IPS displays were developed in the 1996 by Hitachi.Inc
IPS is also and LCD display it uses polarizers and liquid crystals and everything else but it a different way than TFT's and LCDs. so let's see how IPS display work?

IPS (In-Plane Switching)

The polarizers in IPS are not at a 90 degree angle to each other but are in the plane, So with liquid crystals inside the light coming from the back of the display gets through the first polarizer gets twisted by the liquid crystals and then blocked by second polarizer. 

To let the light pass through current is supplied to the liquid crystals to untwist them. 

It's pretty easy to get confused in the working of TFT and IPS displays but the simplest i can put them is lke this.

IPS Displays - work on the principle of blocking the light and let some of it pass when required.

TFT Displays - work on the principle of letting the light pass and blocking some of it when required.

And some other differences too, IPS displays unlike TFT's have transistor arranged on the same plane but, because of that most of the light coming from the back gets blocked, creating a very dim image  so a brighter backlight was placed at the back.

Retina Display

Retina Display is basically IPS display with the number of pixels so high the human eye cannot see any any individual pixel. 

Pros and Cons

• Pros

1. Accurate color, better viewing angles, higher fps
2. Do not show tailing when touch making it ideal for touch screen devices.
3. can handle better graphics and decreased respnse time

• Cons

1. Requires more power than TFT's because of brighter backlight, 15% more power consumption
2. More Expensive than TFT's

This is it, in the next part i'll be talking about LEDs and OLEDs so remember to come back tomorrow.

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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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

and  do not forget to share this it would help me a lot, Follow me on

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LCDs Explained Part-2

After the invention of the CRT TV everything was great everybody liked it, And in a short period of time it replaced the mechanical televisions, but later people started having problems with it. taking too much space, rising electricity bill. and many more. To read more about the CRT tv's click on this
 link-http://shekhar087tech.blogspot.in/2014/07/get-to-know-displays.html
So to get rid of all those problems in the year 1964 first Liquid Crystal Display or LCD was made, by a man named George H. Heilmeier.

George H. Heilmeier

Friedrich Reintzer

Liquid Crystal is another state of matter other than Liquid, Solid and Gas, discovered by an Australian scientist Friedrich Reintzer, yes there are more than three states of matter you have been misled by your school. but that's not the point, the point is what are Liquid Crystals ?

Liquid Crystals have the properties of both liquid and crystals it has molecular structure of crystals but it's molecules can flow over each other as a liquid. But the main reason why they are used to make electronic displays, it's because of their tendency of bending light. there are many types of liquid crystals but the one we use in displays are Twisted Nematics (TN) and the reason for that is down there some where..



LCD's play a major role in the world of technology conquering every field from desktops to smartphones from tablets to laptop LCD's are used in almost every electronic devices.
so let's see how LCD's works?

Liquid Crystal Display

LCDs consist of two polarizers right angled to each other what polarizers do is that they let only one phase of light pass through so what ever light passes through the first polarizer cannot go through the second. To let the light pass we use Liquid  Crystals and especially Twisted Nematics because TN can turn the angle of light by 90 degrees and change it's phase.

Liquid Crystals have predictable effects of electricity, when we apply current they untwist a certain degrees depending on the intensity of the current. so when liquid crystals untwist they block the light and when they are in rest mode they turn light and change it's phase. that  is how light is controlled in an LCD and speaking of light LCDs cannot produce light of their own so they need backlight. which are placed generally  at the bottom and layers of different kinds of transparent sheets spread it evenly on the screen.

On top of every thing there are different layers of  three fundamental colors Red, Blue and green are placed, yes these are the little red, blue and green dots you see when you come really close to any screen and these are called the subpixel and together they make one complete pixel.

all the colors are made by using the three subpixels.

Pros and Cons

• Pros

1. LCD's are slim, light weight and making a 50 inch LCD display doesn't take up much space.
2. Uses way less power than CRT's 

• Cons

1. Expensive.
2. Small viewing angles if you move out of the viewing angle you can even see the negative of the image.
3. Because they use back light they cannot show deep black it's always Grey and shades of Grey.

To remove the cons or inabilities of the LCDs many different types of LCDs were invented, and even changing the circuit of the display can create a big effect so the next article is all about that types of LCD's

I have already made a video Get To Know- Displays. be sure to check that to link is
 here-https://www.youtube.com/watch?v=aHVEBThfC_U&list=PLari93Sljmzi6ZTgcNdVnwGU32xbVYOnD&index=2

Be sure to share it on facebook or twitter if you like it and to follow me

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CRT Displays Explained

Displays are the thing we interact the most with while using any of our devices from desktops to laptops, from from smart phones to tablets, every thing has a display and all of them looks so similar every display that we see today is sharp, slim, sexy with million of colors but when you read the specs every thing is different some are LCDs,LEDs, IPS, TFTs, OLEDs, AMOLEDs and many more..

And that's what this Get To Know is all about, get inside each and every kind of display and see what it is and how it works..

But before starting this Get To Know i would like you to know that i have already made a video on this so if you want to check that out just click this link .
https://www.youtube.com/watch?v=aHVEBThfC_U&list=PLari93Sljmzi6ZTgcNdVnwGU32xbVYOnD&index=2

Let's start with the oldest electronic TV, remember the old heavy bulky TV we had in our living room they use the same technology as the first all electronic television. CRT technology . CRT ( Cathode Ray Tube) and  was made by Philo Taylor Farnsworth in 1928 as in the name he used cathode ray tubes to make that TV but the CRT's were not his invention CRT's were developed by a Karl Ferdinand Braun. let's see how CRT tv work.?

CRT Televisions

A CRT tv consist of a electron gun which fires a beam of electron on the phosphor screen (the part where images are made) that glows at the spot where the electron struck, well that's just the summary let's take a more detailed look. Inside the electron gun there is a heating element on the cathode of negative part of the gun that excites the electron by giving them energy and when the electrons get excited they jump outside and outside that element there's the anode or positive part or the gun which attracts the electron giving them direction and increasing the speed but electron need to be in a straight line before hitting screen that is why the anode has only one opening in the middle that let's electron pass through and he electron that hit the anode nit he opening get absorbed by anode.

After that comes a two pair of horizontal and vertical pair of focusing and deflecting coils that determine the spot on which the electron should hit the phosphor screen.

But the first Television wasn't a color tv it's was Black and White, and because of the difference a question rise. How ? Television got it's color, and to understand that we have to see the difference between both the versions of the tv, the Black ans White Tv consists of only one electron gun and a phosphor screen that glows White or Grey when an electron strikes it. But the color Tv has three electron guns and a phosphor screen having little Red, Green and blue spots on it  each electron gun is sensitive only one color these spot on the screen are so small that when the screen glows light from each color blends creating a new whole different color and every color that a human eye can see is made up of these three colors.

Pros and Cons

• Pros

1.  Great viewing angles.
2. Low response time responsible for images without blur.
3. Long Lasting.

• Cons

1. Heavy and bulk taking so much space so making a big display would take up so much space.
2. Uses high amount of power
3. Can suffer Image Burn-in

Image burn-in is explained on another article link to that is here-http://shekhar087tech.blogspot.com/2014/07/get-to-know-image-burn-in.html

Image Burn-in

CRTs are great but the list of cons is not acceptable so there was a need of something better and that's when LCD's come in the picture. 

Get To Know Displays Part-2 LCD's will be out the next day this article goes online so be sure to read that tomorrow 

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Get To know - Image Burn-in

Image burn-in happens when a single or same image is shown on a CRT TV for a long period of time, it leaves a stamp or slightly diminished figure of the previously displayed image and that ghost  of the image never leaves once it's there it's there for life even if you turn of the screen you can see the image.

This is caused only in CRT displays mainly CRT desktop monitors, because TV's don't show a single image for a long period of time. To remove this problem Screen Savers were made screen savers show different images or random animation or graphics keeping the screen from showing the same image.

Read more about displays on the Get Know Displays video or the Article link to both is at the bottom.

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Get To know Displays video -https://www.youtube.com/watch?v=aHVEBThfC_U
Get To know Displays Part-1 CRTs- http://shekhar087tech.blogspot.in/2014/07/get-to-know-displays.html

Moto X and Moto G banned in Germany..!!

In a ruling made on July 8, the Mannheim  Regional Court in Germany found Motorola to infringe on a patent held by German engineering firm LPKF in regards to the antenna design used in the Moto X and the Moto G smartphones.

The ruling requires Motorola not only pay compensation to LPKF, but also recall devices sold in Germany that are guilty of the infringement.

Motorola, now  a subsidiary of Lenovo, acquired from Google for $2.91 Billion at the beginning of the year. The infringing Moto X and Moto G devices were outed during Google's brief ownership of the company.

It's unknown whether LPKF will peruse patent infringement in other countries where the Motorola devices are sold, while it's likely Motorola will seek to appeal the ruling in Germany..

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iOS 8 Beta version available for Developers...!!

Apple in now rolling out the iOS 8 beta 3 firmware update. It brings various improvements, new features and new options.

the iOS beta 3 allows the T-Mobile USA subscribers to use WiFi calling for batter audio quality. the new firmware also enables new iCloud Drive options and improves the battery statistics.

Side-by-side with the new iOS 8 Beta firmware Apple launches new beta versions of the Apple TV, Find My iPhone and Find My Friends apps. you can download hem from the new Beta Apps in the App Store.

Finally, Quicktype is now an option in Settings menu, plus other minor tweaks.

Naturally, Apple has begun seeding the third beta of the Mac OS X Yosemite, too.

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Moto X and Moto G to get Android L..!!

Android L is still in the developer preview phase but companies are already vowing to bring it to their devices. we saw a glance of it at Google IO this year and for sure we all loved what we saw.











Motorola has almost stock Android experience with their devices an we all especially me love the stock Android and one of it's advantages is quick updates . and now the Motorola customer support is claiming that the Moto X and the Moto G will definitely get the L update. As for the entry-level Moto E the supprort team has no information yet.

Customer support isn't the most reliable source of information, the decisions to update a device are made higher up and only after in-house developers have had a good look and evaluated the possibilities. considering Android L is not even final, it may be too early to be talking of definite updates let alone time frames.

HTC has announced that it will roll out the L update within 90 days of receiving the source code from Google. the Nexus devices will get Android L in the fall so that's as good a time frame as we have right now. presumably Motoroa ca get the job done before HTC as there's almost nothing to modify..

If you have any update drop them in the comments section down below ..

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Coming Up..!!

More Reviews and Get To Knows are on the way, with Rumor Mill on the side..

1. Get To Know- Displays..!!
2. Get To Know- Battery..!!

If you guyz know something that needs some explanation or want me to review any specific product just leave it in the comments section down below, i'll be glad to take a look at..

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