Tips on how to choose a home theater projector--4k

by Chelsea . on April 01, 2022

Is there a real or fake 4K? The dispute of real or fake 4K exists in many industries, with projectors included. Actually there is some tips for you to tell the real or fake. Let’s see what it is.

At first, we need to learn about 2 substantial concepts: Display chip and resolution.

The display chip is the chip that provides the image display function of the projector. The larger the size of the display chip, the higher the resolution of the picture.

Resolution is the clarity of the projector's picture. The higher the resolution, the clearer the picture.

With a resolution of 4096*2160 and total pixels of up to 8.8 million, a true 4k projector can project ultra-HD and detailed images. The amount of data per frame is 50MB, so both decoding playback and editing require top configuration machines. There are very few manufacturers who can meet this requirement.

The smart projectors that can be seen on the market today using DLP solutions basically use DMD chips provided by Texas Instruments. In order to meet the requirement of 4k resolution even at lower cost, Texas Instruments has found a new solution - XPR dithering technology (pixel shift technology).

But according to the Consumer Technology Association (CTA), as long as the projected image reaches 8.3 megapixels that is 4K, so the display that reaches 8.3 megapixels through XPR dithering technology is also in line with the 4k standard set by the CTA, which means that it can reach 3840*2160 resolution. Only it is not the native 4k resolution, nor is it the real 4k resolution inside our perception, so projector users generally refer to it as fake 4k or pseudo 4k.

The difference between 0.47 and 0.66 DMD chip 4k resolution

The true physical resolution of the 0.66-inch DMD display chip is 2716*1528, approximately 4.15 million pixels. It is displaced once in the diagonal direction by XPR dithering technology, thus achieving effective pixels*2 and reaching the standard of 8.3 megapixel display.

The true physical resolution of the 0.47-inch DMD display chip is 1920*1080. it is also shifted once up and down and left and right by XPR technology to finally achieve effective pixels*4 and obtain 8.3 million pixels to reach 3840*2160 resolution.

Although both reach 4k resolution, there is another difference between the 4k resolution displayed by the 0.47 and 0.66 DMD chips.

The 4k picture quality of 0.47DMD chip will be more blurred and grainy compared to 0.66DMD chip. The 4k picture of 0.66DMD chip is more clear and delicate.

In addition to this, not all projectors with 0.47 DMD chips are 4k resolution. If there is no 8.3 megapixels through XPR dithering technology, then the projector with 0.47 DMD display chip is still 1080p resolution, so you should be careful to identify it.