4K TV means a tv which will provide you 4 times the resolution of your current TV and it's called 4K because the horizontal resolution is 4K pixels across. As far as the oled tv is concerned, they are known for better picture quality, they are very thin and also have lower power consumption than your current TV. Sony and panasonic also launched the 4K oled at the CES this year but it will take a lot of time for them to become available so as per now lg is the only brand who has lauched the 4k tv's and the oled tv's as well.

Hi Amit, LG WRman Sherlock here,

Technically, an Ultra HD TV boasts of a resolution (3840 x 2160) with the horizontal resolution approximately equivalent to 4K pixels. What it translates to on the TV screen is the crisp colors and intricate details you are able to see in the visuals; something not possible in a full HD TV.

OLED TV on the other hand is a full HD TV. However, OLED technology is similar in nature to how Plasma's work with much more refined results. The deepest blacks, the most serene colors, unsurpassed dynamic contrast ratio with a form factor to die for. Add to that LG's proprietary WRGB technology, you get the most brilliant TV display till date.

LG WRman Sherlock out!

Source: Research

On one side, there's 4K: four times the resolution of your current TV. LG, Sony, JVC, and others have all announced or shown upcoming 4K displays.

On the other, there's OLED: Organic Light-Emitting Diode. Significantly better picture quality than your current TV, plus lower energy consumption, and even thinner cabinets.

So what's more exciting?

With 4K, there are many potential benefits. You can sit closer to your TV, for one, without ever seeing pixels. Or you can get a much larger TV for the same reason. If you sit close enough/have a big enough TV, you'll see incredible levels of detail. Both the LG and Sony are also passive 3D. With 1080p TVs, this means you get half-HD resolution per eye (1,920x540 pixels). With 4K, you get 3,840x1,080 pixels per eye.

Source: google search

On an OLED HDTV, colors pop like nothing you've seen before. There is no blacker black than the black you'll see on an OLED TV, and colors look vivid and twinkly against that pitch-black background. You also get ultra-wide viewing angles. Because of the display's fast response rate, fast motion looks fluid on the screen, and 3D content looks amazing. OLED TVs don't need a backlighting system, so they're the thinnest HDTVs on the planet; LG's first OLED set is less than 0.16 inches thick. An OLED display can also be malleable; both Samsung and LG showed off curved prototype OLED sets at CES 2013.

On the other hand, a 4K TV's strength is sharpness. There are four times as many pixels packed into the display as there are on a 1080p set, so you can see more granular detail than you can on a 1080p HDTV.

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