The 4K DLP projector with TI's new 4K UHD (Ultra HD) DLP chip is now in full swing, especially since the Optoma UHD60 will be available in the late second quarter at a staggering $2,799.
But is the new 4K DLP chip really a native 4K chip? After all, it has only 4.15 million micromirrors instead of the 8.3 million required for the native 4K 3840x2160 display. Did it perform pixel shifting in the same way as Epson and JVC did for 3LCD 4K enhanced projectors?
The answer is both Yes and No. The similarity is that they all rely on the optical diagonal offset of the pixels in the sequential refresh so that when the second refresh occurs, a portion of the pixels are overlapped. Therefore, for each frame, the base image and the shifted image are displayed. This happens so quickly that the eyes fuse them into an image. When you are watching a movie, you will not be aware of this process.
4K projectors using 4K DLP chips or 4K enhanced 3LCD processing can receive raw 4K signals and then perform a large amount of video processing on these signals in preparation for output to non-native 4K DLP or 3LCD imaging devices. The difference is that TI's 4K Ultra HD processing can produce a separate single-pixel structure, while 3LCD processing does not.
In fact, the most obvious difference between 4K DLP and 4K enhanced 3LCD projectors is the visible resolution. The 4K enhanced 3LCD projectors from Epson and JVC (currently available on the market) use native HD 1080p chips with a physical resolution of 1920x1080. By projecting a 1920×1080 image on the first scan and then shifting the second 1920×1080 image diagonally over the first scan on the next refresh of the chip, Enhanced resolution. In this process, the total number of addressable pixels is (1920 × 1080) × 2 = 4.15 million, which is half of the native 4K signal 8.3 million.
The initial resolution of the 4K DLP chip is already twice that of 3LCD devices. It has a total of 2716 × 1528 micromirrors. With some proprietary video processing technology, it allows each micromirror to render two separate pixels. When the chip is used in the pixel shift processing, the number of pixels presented in each refresh is twice that of the 3LCD projector. In this process, the total number of addressable pixels is (2716 × 1528) × 2 = 8.3 million, or the same as the native 4K signal. The pixels have been reformulated by video processing to correlate the native 4K signal information with the mechanism of such pixel shift display.
So what does it actually look like?
As far as the perception of the eyes is concerned, the result of both treatments is a greatly enhanced picture resolution relative to standard HD 1080p. As far as 3LCD is concerned, although it is only half the number of native 4K addressable pixels in digital terms, at a typical viewing distance, the video program perceived by the eye on a 4K enhanced 3LCD projector is closer to the native 4K than 1080p - subjective On the other hand, the image does not look like "the half" between 1080p and 4K as the number suggests. It looks more like about 90% of native 4K, at least for video. The bottom line is that when viewing video content from a normal viewing distance, it is difficult for most consumers to distinguish between a picture produced by a projector using a native 4K chip and a picture produced by a projector using 3LCD pixel shifting technology.
However, when switching to something other than video, you get a different impression. For example, when projecting high-resolution images or typographically intensive financial statements using small fonts, the potential resolution of the 4K DLP chip becomes more pronounced than the 3LCD pixel shift. When viewing this type of theme on a 3LCD Pixel Displacement Projector, you may see moiré in complex graphics, or see the softening of the serifs on the small text on the spreadsheet and the definition is not precise enough. . These details can be parsed more sharply when using a native 4K projector or a new 4K DLP chip projector.
Now, with the new 4K DLP chip, the digital resolution on the screen seems to increase from the perceived (say) 90% of 4K to 95%, due to the doubling of physical resolution compared to 3LCD. 4K. However, the numbers are misleading again. This is not the actual result. The detail resolution produced by the 4K DLP chip is virtually indistinguishable from pure native 4K, even when viewed from very close distances. The ultimate test is a 1-pixel line test image showing 4K resolution, which contains alternating black and white lines of a single pixel width. When viewing this test pattern on a projector using a 4K DLP chip, each line is clean and clear, and you will see a clear pixel definition when viewed at close range. This level of precision is not possible with pixel shifting techniques using standard HD 1080p chips.
So while the 4K DLP chip itself has 4.15 million micromirrors instead of 8.3 million, based on which they can display a clean 1-pixel line test pattern, ProjectorCentral does not have any 4K resolution for the 4K resolution that will use the chip. objection. No native 4K projector can do anything better. In fact, if the chip can produce 8.3 million discrete pixels on the screen and fully resolve the 4K 1-pixel line pattern, the number of micromirrors on the chip is irrelevant.
Other important factors to consider
3-piece convergence. Another factor in the resolution capability of the 4K DLP chip is that unlike any 3-chip light engine design (whether DLP, 3LCD or LCOS), its single-chip implementation (using a color wheel as a light modulator) does not produce convergence. The risk of the problem. For 4K resolution, the precise convergence of three separate red, green, and blue imaging chips becomes critical when it comes to maximizing image clarity. A potential advantage of sequential color updates from a single DLP chip is that all three colors are always fully converged. So while it feels a bit strange, however, compared to a true native 4K projector using three separate R, G, B chips, if the three chips are not perfectly aligned, then the single 4K DLP chip with the color wheel has Presenting the potential for a little more precision.
Watch the distance. It is also important to remember that viewing distance is an important factor in perceived resolution. In fact, when viewed from a normal distance of, for example, 1.3 times the screen width, even in a standard 1080p image, all the details on the screen cannot be seen. Close to the screen, you can see the pixel structure, but back to 1.3 times the screen width of the viewing distance, the pixel structure will disappear, because the resolution of such tiny details beyond the human eye. Now, the screen generated by the 4K DLP chip or the 3LCD 4K enhanced model will display a resolution higher than the standard HD 1080p picture viewed at a distance of 1.3 times the screen width. However, as we reach the human eye limit of interpreting fine details at this distance, the perceived difference between native 4K and 3LCD 4K enhanced projectors becomes weak for video, although as previously stated, for high resolution Graphics and text are less faint.
Contrast. A large part of the subjective impression of picture sharpness is not the actual physical resolution, but the contrast of the image - the higher the contrast, the higher the sharpness of the picture you feel. This is because the details in the shadows and highlights are more clearly highlighted on the high-contrast projector, and the edges between the dark and bright objects are more precisely defined. Due to this phenomenon, and considering the normal viewing distance, a conventional high-definition 1080p projector with a very high contrast ratio may appear to have higher definition than a lower-contrast native 4K projector. That's why many enthusiasts believe that for excellent image quality, high contrast (and other factors such as color accuracy and wide color gamut) is actually more important than resolution, especially for home theater projectors.
in conclusion
Finally, we urge you to consider all the features and attributes of the projector before making a purchase decision. 4K resolution is clearly a hot topic in the projector industry today, and ProjectorCentral believes that based on the accuracy of the on-screen image and the ability of each micromirror to drive two independent single-pixel structures, the new 4K projection using TI's 4K DLP chip The machine is qualified to be called a native 4K projector. How they do this is related to some (TI's unique) behind-the-scenes technical magic, and we will never know.
However, even though the high precision of the 4K DLP chip is so impressive, this accuracy is more pronounced in complex images and dense text than in video. But all projectors that use native 4K chips are like this, not just new 4K DLP chips. Finally, the show you watch and your preferred viewing distance will determine the details that are actually visible on the screen. Keep these things in mind when you're upgrading your new 4K projector with all the exciting options.
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