In our first test, we will compare projectors using the two new 4K UHD DLP chips. We can do this by setting up the Optoma UHD60 with its 0.66" chip sporting 2716 x 1528 mirrors, and the Optoma UHD50 with its 0.47" chip, having just 1920 x 1080 mirrors. The UHD60 has two-phase pixel-shifting to double the number of pixels on the screen while the UHD50 has four-phase shifting to quadruple the number of pixels. Let's put these two projectors side by side and take a close look.
Viewing the pictures close up, at a distance of 12 inches from a 5-foot wide image, you can see an obvious difference in pixel structure. The UHD60 with its 0.66" chip and two-phase shifting produces a distinct pixel structure. Each pixel is extremely small of course, but you can see clearly distinct pixels in rows and columns when you examine the image close up.
On the UHD50, when you are at the same distance of 12 inches from a 5-foot wide screen, you can detect an extremely subtle hint of pixel structure, but it is nowhere near as distinct as on the UHD60. There is no sense of discrete individual pixels. This is true of the ViewSonic PX727-4K as well which uses the same 0.47" chip. The indistinct pixel structure on these projectors is a feature of the four-phase pixel shifting going on with the 0.47" chip.
Once you back up to a viewing distance of two feet from a 5-foot wide screen (that is, 0.4x the screen width and a lot closer to the screen than anyone would want to be when watching a movie), all hint of visible pixel structure disappears on both projectors. At this distance the UHD60 and the UHD50 look the same, at least in terms of detail resolution.
Is there is any visible difference in image sharpness? The answer is clearly no -- in practical terms you see exactly the same amount of image detail on both models. The fact that one projector's chip has a mirror matrix of 2716 x 1528 and the other a matrix of 1920 x 1080 (half the number of mirrors) has absolutely zero impact on the sharpness and detail in the image.
This does not mean the pictures look identical. There are other contributing factors on a projector that affect what you perceive as image sharpness. In this case digital noise is a factor - the lower the noise the cleaner and sharper the picture looks. And in this regard the UHD50 tends to edge the UHD60 with an overall lower noise factor.
In addition, one of the biggest factors influencing what you see as image detail and sharpess is contrast. In this case the UHD60 is higher in contrast than the UHD50, and in many scenes this contributes to the perception of it being the sharper of the two projectors. But at the end of the day, both the level of digital noise and the projector's contrast have more impact on one's perception of the sharpness and the ability to resolve detail on these two projectors than does the physical resolution of their chips, which is a non-issue.
|Contents:||Intro||Optoma UHD60 vs UHD50||ViewSonic PX727 vs Epson 4000||Optoma UHZ65 vs Sony VW285ES|
|What Makes a 4K Projector|