- UHD (Ultra High Definition): The standard for consumer devices such as TVs and projectors. The resolution is 3,840 × 2,160 pixels in a 16:9 aspect ratio – exactly four times Full HD. Almost all devices marketed as "4K" actually use this UHD standard.
- DCI 4K: The cinema standard with 4,096 × 2,160 pixels and a slightly wider aspect ratio of approx. 1.90:1. Only relevant for professional cinema projectors.
- Full HD: The classic HD standard with 1,920 × 1,080 pixels in 16:9 format.
- DCI 2K: In the cinema context, 2K describes a resolution of 2,048 × 1,080 pixels (approx. 1.90:1). The common equation of 2K with Full HD is therefore not technically quite correct.
4K in projectors: native 4K and pixel shifting
With TVs, the display always physically has 8.3 million pixels. Projectors are different: only a few high-end projectors have a native 4K chip. The vast majority achieve 4K resolution via pixel shifting – an optical process in which the pixels are rapidly offset to increase the perceived resolution. On the screen, the result is barely distinguishable from native 4K.
Detailed guide: pixel shifting vs. native 4K – differences, pros and cons →
Why is 4K worth it?
- No screen-door effect: With large image sizes, the pixel structure becomes visible with Full HD. 4K almost completely eliminates this grid.
- Sit closer, see more: A higher resolution allows shorter seating distances without loss of sharpness – ideal for large screens in compact rooms.
- Future-proof: More and more streaming content, games and Blu-rays are released in 4K. If you invest in 4K today, you're well set for years to come.
Further guides
- Pixel shifting vs. native 4K: the big comparison
- DLP projectors: technology, pros and cons
- Projector contrast: "on/off" vs. ANSI explained
