All 4K displays, regardless of their size, contain the same number of pixels. A 4K TV has more pixels than a 1080p TV, and a 4K image is four times the size of a 1080p image. Physical Resolution: On a TV spec sheet, the physical resolution is simply referred to as “resolution.” It’s the number of pixels on a display.We’re also going to cover pixel density-but don’t worry-we’ll keep things short and sweet. These aspects work together to create a good image, and they’re the basis for understanding upscaling. However, we tend to forget some key aspects, namely, the difference between physical resolution and optical resolution.
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