The BenQ TK800 Display Capabilities
4K Lens System
The BenQ TK800 (Price Check) features an optical system designed for 4K projection. The lens array consists of four groups of 7 lens elements, with low-dispersion coatings to minimise chromatic aberrations.
This 4K lens system provides up to 1.2X optical zoom, with wide apertures of f/1.94 to f/2.06. The zoom function allows you to, for example, project a 100″ image from a distance of 3.25 m to 3.9 m away.
At its widest, the TK800 lens array will provide clear focus between 1.95 m and 6.51 m away. if you dial the zoom up to 1.2X, it will provide clear focus between 2.34 m and 7.81 m away.
4K UHD Resolution
The BenQ TK800 (Price Check) is built around the 0.47″ single DMD (Digital Micromirror Device) chip from Texas Instruments. There are over 2 million microscopic mirrors on this chip – each representing a pixel.
This DMD chip has a native resolution of 1920 x 1080, so how does the TK800 project a 4K UHD display with 4X as many pixels? That’s where the XPR Technology comes in.
What XPR does is “wriggle” the projection lens in a circular fashion at 240 Hz, so that each micromirror creates four projected pixels, instead of just one pixel. This effectively quadruples the DMD chip’s native resolution of 1920 x 1080 into a projected image of 3840 x 2160 pixels.
XPR allows the TK800 to deliver true 4K resolution with almost 8.3 million pixels, making the projected image appear much sharper, especially in larger projections. However, because they were generated from a DMD chip with 1920 x 1080 independent pixels, expect aliasing artifacts.
While a true 4K DMD chip with 8.3 million micro mirrors would deliver the best possible 4K projection quality, that is many more years in the making and would be prohibitively expensive.
The single DMD chip the BenQ TK800 (Price Check) uses has just over 2 million micro mirrors, which gives it a native resolution of 1920 x 1080 pixels.
This means that all 4K content will be downsampled to 1080p, and processed for 4K output by the DMD chip. The projected image is then quadrupled by XPR to the 4K resolution.
The actual image is not a true 4K output of a proper 4K DMD chip, but it’s far better than a 1080p projection. The image processing ensures that final image is perceptively close to the actual 4K image.
The good news is – XPR will also upscale your 1080p content to the 4K display resolution, giving you a perceptively sharper and more detailed image than is possible with a 1080p projector.
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