“How 4k technology works with pixels and how it makes a difdenxe if TV has HD and led both.”
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4K Ultra HD has 3840 pixels × 2160 lines of resolution. Standard HD is 1920 pixels x 1080 lines. Anything displayed on a 4K TV that isn't Ultra HD resolution will be upscaled to the 4K TV's native resolution. So the lower the resolution of the source, the softer the image will be on the TV. TVs with better upscaling engines can do better jobs of mitigating this. LED is the is the type of lighting used to light up the pixels on the panel. Older TVs used flourescent lights, current ones use LEDs. Most TVs today mount the LEDs around the edge of the panel. But this can cause blacks to look cloudy. More expensive sets have use full array LEDs behind the panel to light the screen more evenly. Paying still more gets you local dimming, which can turn on and off individual LEDs in the array to make the dark parts of the screen darker. Mortgage the house and you step up to OLED TVs that have pixels that individually light themselves to provide the highest levels of contrast and the deepest blacks.
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