what is difference between LED TV and 4k TV
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A 4K TV has an even higher resolution than an HDTV. Most current HDTVs have a resolution of 1920×1080 (number of pixels horizontally/vertically), which is often referred to as Full HD, while the resolution of older HDTVs is 1280×720. A 4K TV's resolution is 3840×2160, or 4 times the resolution of full HD
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LED backlit 4K UHD TVs (including Samsung's new QLED line) are technically really still LCD TVs with a higher resolution and are taking the name 4K UHD or 4K Ultra HD. 4K LCD TV is a more appropriate name. ... While OLED TVs are still more expensive than good 4K LED TVs, the gap has narrowed.
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