The living standards are improving, and the spiritual needs of consumers for leisure and entertainment are growing. Building a home theater has become a mainstream user's need to improve the quality of life. The core of home theater building is the display device. With the increasing demand for display effects from people, the resolution of display devices has also progressed rapidly. Currently, 3840×2160 4K has become popular on flat-panel TVs. However, the resolution of mainstream home projectors is still 1080P. 4K projection is not without, and its price of tens of thousands of yuan for the average consumer heart but not action. In early 2016, Texas Instruments released a DLP® 0.67-inch 4K ultra-high-definition (UHD) chip that can combine the high switching speed and advanced image processing capabilities of digital micromirror devices (DMD). Pro-people 4K home theater projection display program. This program began to appear in the second half of 2017, there are terminal products, the first is BenQ's Star Series 4K projector, the price of 4K projection for the first time exceeded 10,000 yuan. And ViewSonic is more radical, launched in early 2018 the PX727-4K, the price directly to 8K below, this 618 special price as long as 6999, is simply a price butcher. When prices are no longer the threshold, the popularity of 4K projections is not far away. Then the price went down. How about the projected picture quality? I started with this PX727-4K at the start of the year. Let's take a look at my assessment below.
Appearance & Details
Packaging front
On the back of the package, details of the projection details listed on the label.
Open the package, you can see the internal filled sponge to fix the host.
The host of the ViewSonic PX727-4K uses a white ABS case, and the surface is finely frosted and does not reflect light. Volume 332x261x135mm, weighing about 4kg. An ultra-high voltage bulb is used as the light source and its brightness is 2200 lumens. However, like the majority of ViewSonic's home shots, there is no lens cover, and this is where I have been dissatisfied.
The control area of ​​the ViewSonic PX727-4K is located on the top of the fuselage, if the lifting into it is just down.
The upper left corner of the top surface is a projection focusing ring, supports 1.2 times zooming, and the projection ratio is 1.47-1.76.
A 4K UHD logo is printed on the upper right corner, standard resolution 3840*2160, contrast ratio 10001-20000:1.
The lower right is the operation area, which can achieve most of the projection operations, such as manual +~-40 trapezoidal correction/vertical trapezoid.
The right side of the fuselage is the air inlet of the cooling fan. After all, the ViewSonic PX727-4K uses a high-voltage ** light as the light source. It is not possible to have a good cooling system. The right side of the fuselage also has a high-quality 10W stereo built-in. For home theaters, it's only available. In fact, most users spend 78,000 on a 4K projection, and it would be no problem to spend a thousand or more on the stereo.
The left side of the fuselage is the outlet for heat dissipation, which forms the diagonal with the air inlet on the right side, and can quickly bring out the large amount of heat generated by the high-voltage ** light.
The underside of the fuselage is the product nameplate, logo, and mounting bracket mounting holes.
Adjustable height support frame.
Projection performance test 
The ViewSonic PX727-4K features an RGBRGB six-segment two-color wheel technology to make the projected picture more smooth and natural. And with HDR projection display technology, you can automatically adjust the brightness of each area, so that darkness, high light can have a delicate level. There are also SuperColor colorful technologies that are repeatedly mentioned by ViewSonic and can exhibit a wider color gamut. What is the actual effect? Try to know.
The ViewSonic PX727-4K uses the 0.67-inch DLP®4K (UHD) chip with the DMD to dither 4K instead of the native 4K, so at the beginning I didn’t worry about its color, but only worried about the resolution. rate. Unexpectedly, the ViewSonic PX727-4K fully met the basic requirements in Professor Qian's 4K test chart.
In the tone level test, of the first 32 and 64 gray scales, the ViewSonic PX727-4K is only slightly dark in the darkest part, but the rest of the gray scales are clearly legible, and there are no obvious jumps or steps in the gradient areas. phenomenon. The ViewSonic PX727-4K reaches a good level in the shadow and highlight levels. In the sphere diagram, the ViewSonic PX727-4K transition is smooth and smooth, but there is a slight degree order in the darkest shades of gray. In this project ViewSonic PX727-4K performed excellent.
In the color performance and viewing angle test, the first HSB system color block diagram, 135-120 is where many liquid crystal displays are prone to appearing in parallel, and the ViewSonic PX727-4K performs very well. There is no obvious color in the two color blocks. Parallel phenomena. The overall color blocks are saturated in color, although there is no obvious color shift in the conversion angle, there are certain changes in light and shade, which may have a certain relationship with the curtain, it seems that the money on the screen can not be saved.
In the color distribution area, the six colors all become distinct triangles, but the three-color region of RBG is obviously overweight. This should be the result of the RGBRGB two-color wheel enhancement of ViewSonic PX727-4K. The result of the application is that the RGB color of the projection screen will be more saturated and brighter than the original one, and it is a kind of color grading method to please the eye.
In the chromosphere, nine chromosphere transitions are soft, but the lowermost purplish ball has light ribbon mutations.
Although this test is not perfect, it is generally better.
Four pure **tests can saturate the color of the ViewSonic PX727-4K, but if you look closely, the brightness around the picture can happen slightly lower than the center. In fact, this is because the ViewSonic PX727-4K uses a high-voltage ** light source.
Projection proofs 
The results of the test chart are obvious, but for most people, see how the results of the results are related to the actual effect, then I will take a few more samples. This portrait of the character, the overall warmer than the original film color temperature, high light area can be obviously adjusted, the brightness is slightly reduced, you may see the white bed sheet and the pillow texture details.
This high mountain landscape (I couldn't tell if it was a sunrise or a sunset), the overall color saturation has a rich level. However, some areas such as pink flowers are missing.
This should be a map of the sea at sunset. The original film shot on this map is very good. The ViewSonic PX727-4K shows the details of the dark part and can clearly see the surface details of the rock.
This leaf picture is calculated as a previous HDR test chart, with strong light and hidden corners. Although the ViewSonic PX727-4K has enhanced the HDR function, in this figure, it is still found that some dark corners of the branches and high light leaves do not see the details.
Video projection After watching the static picture, take a look at the dynamic video proofs.
This is the classic 4K must-measure sample, the original name is not clear, we call it "beauty and roast duck." Thanks to the high-quality original film, the screen is delicate, saturated in color, and structured. In the actual projection screen, the screen performance is excellent and no obvious problems are found. (Dynamic video, it is difficult to find the problem)
This is TCL's 4K four-color test piece. From my point of view, the original picture's beauty is lower than Beauty and Roast Duck, but it's easier to find problems with the display device.
For example, in this picture, the waterdrops on the rose are crystal clear and transparent. However, this segment was shot with a strong light and reduced exposure, and the details of the dark scene were almost black. The actual picture, in the dark part, increases a bit of brightness and appears blackish red.
In the green test section, the main colors are saturated with respect to the original piece, and it looks more comfortable.
In the yellow phase, the color is also relatively saturated, but the large area of ​​yellow is still somewhat deaf.
Blue is the best color of ViewSonic PX727-4K, with a strong sense of transparency.
to sum up The ViewSonic PX727-4K is an entry-level 4K projector that uses the Texas Instruments 0.67-inch DLP®4K UHD chip, which is the lowest price in the industry. ViewSonic PX727-4K quality performance, clarity are good, but also affected by the chip, just "shaking" out of the pseudo 4K, so the details of the shadows and highlights and that few tens of thousands of true 4K projection or some gaps. At a time when Jingdong 618 is a good time to buy ViewSonic PX727-4K, why do you know, 618?
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