In the past commentary on the "Zhongwenwen," some value-oriented friends criticized the landlord for not providing a specialized ultra-short-throw resistance screen for the "MiJia Laser Projector." They argued that given the significant investment, receiving a free laser projection should come with additional features, allowing more value-oriented friends to fully grasp the true capabilities of the "MiJia Laser Cinema." While the landlord felt somewhat embarrassed, there was no real argument to be made. Consequently, prior to the "MiJia Laser Theater" crowdfunding shipments and official retail availability, we've decided to offer an exclusive preview featuring an original "MiJia Laser Theater" with a black light curtain. This way, everyone can better understand that while the "MiJia Laser TV" might seem appealing, it doesn't perform well as a regular TV without a dedicated curtain. This is likely the first comprehensive review of the entire web featuring the "MiJia Laser Theater" paired with a black grating anti-light curtain.
There are primarily two types of anti-light curtains used for ultra-short-throw projectors. One is the standard black grid anti-light curtain that comes with models like the Nuts A1/A1Pro/T1, and the other is the Fresnel screen used by Hisense laser TVs. Let's start by examining the structural differences between these two screens:
Black/White Lenticular Technology
The structure of the black grid anti-light curtain is exactly as its name suggests—a black grid. Horizontally, a very fine prism structure covers the surface of this grid. Its role is to absorb and avoid reflecting light from the top of the screen while mainly reflecting light from below to achieve the desired light resistance effect:
Sectional Structure Diagram
From the figure, we can see that the primary light-resistant function comes from the protruding triangular surface, with the top of the triangle being a black light-absorption layer and the base being a white reflective layer.
To better demonstrate the characteristics of the black light curtain, I created a GIF for everyone to observe:
Everyone can clearly notice that when looking down at the screen, as the angle changes, the color of the curtain becomes black. When looking upward, the entire screen turns completely white. However, such a horizontal structure can only withstand light from the top of the screen. If light sources illuminate the screen from the sides or the front, the light-resistance effect of the black grid light curtain will significantly decrease. In other words, the black light curtain can exert its maximum light resistance effect only when the ceiling light is used for projection at night. For instance, the Yili StarBright CLR screen, which is most common in the domestic market, has a top light resistance of 95% (US official website data shows 93%, while the Chinese website states 93%), but its viewing angle can reach 180 degrees. However, the screen brightness gain is only 0.6 (the Chinese website states 0.8).
Of course, besides Yili, there are other brands that produce the same type of curtains, and many brands also use Yili's curtains to manufacture their own versions. For example, the landlord purchased the Nail Technology black light curtain.
Currently, the maximum size of the 16:9 black grid light curtain is 120 inches, measuring 2.65X1.49 meters. Larger-sized black grid anti-light curtains are not yet available on the market, but they are expected to hit the shelves soon.
However, it should be noted that the surface of the black grid anti-light curtain is very delicate. It cannot be folded or endure a hard object collision, as doing so will damage the prism structure on its surface.
Fresnel Lens Technology
The Fresnel lens is an optical structure with widespread applications. Its primary function is to collect light (for example, the Fresnel viewing screen commonly used in reverse-view cameras).
Its characteristic is that the screen surface is covered with a concentric circular pattern from large to small. However, its application on the projection screen is not based on lens principles but rather on a reflection similar to that of the black grating anti-light curtain. The absorption principle on one side only modifies the horizontal structure of the black grating into a semi-concentric circle to resist light from the upper side and the left and right sides of the screen, also resisting all light except the direction from the projection.
Of course, the Fresnel screen is not just a single concentric structure; it also includes soft mirrors, colored layers, and hard glass surfaces:
Therefore, although the Fresnel screen has excellent light resistance properties, its price is generally double that of a black screen of the same size. Due to its more complex optical structure, it can only be made into a hard screen that cannot be rolled. Whether it's difficult transportation or installation, it will be much higher than the black screen, so its current largest size is only 100 inches. At the same time, because the light from both sides of the screen is absorbed, the viewing angle of the Fresnel screen is also greatly reduced compared to the black screen. Taking the dnp SupernovaTM STS screen as an example, the viewing angle is only 50 degrees:
Well, it can be said to be a very narrow angle. If you look at the screen from this angle, you will gradually become completely black. This is the same reason as watching the black screen from above. However, due to the Fresnel structure and the use of a soft screen, the brightness gain of the Fresnel screen is very good and can reach 0.9. Regarding the usage effect of the Fresnel screen, you can refer to the evaluation of this site's value-friend @hpc1984:
# The original innovator # simply evaluates my own Optoma laser ultra-short-throw projection and Hisense Hisense Fresnel light curtain purchase reasons. The laser ultra-short-throw projection began to attract attention upon release, because you want a large-size TV, but the price of large-size LCDs is too high, and ordinary projectors cannot be seen during the day. There is no dedicated audio-visual room at home. The emergence of laser ultra-short focus has solved all problems. However, the price is too expensive. It has to be listed on the market for about 20,000 yuan. With the anti-light curtain, the price is almost equal to 30,000 yuan. Of course, the price is still the same. Then it was only a piece of 9500 pieces on the spare fish. The brand name is Huashi hpc1984| Likes 34 Comments 76 Favourites 144 Details
Regarding the price of the Fresnel screen, there are value-friends in the landlord’s testimony that mentioned 4,000 yuan for a 100-inch purchase channel, but these have not been publicly disclosed yet, so everyone can keep an eye out for them, and there is a need for direct supply.
Here, the landlord purchased the 120-inch black grid light curtain this time. Since the MiJia Laser Theater crowdfunding shipments are delayed, there has been no online evaluation of the actual use of the black light curtain or Fresnel screen. The so-called anti-light curtain purchased by the landlord has a certain effect on improving picture quality. However, it also stated in public testimonies that the two corners of the screen are severely losing light. If you look at the screen obliquely, half of it will lose light. And the effect during the day was not very good, so I always wanted to know how the MiJia Laser Theater matches the effect of the black curtain.
Is it projection or television? ——What do you want to know about the Mijia Laser Theater? _ What worth buying is projection or TV? ——What do you want to know about the Mijia Laser Theater? What products are worth buying on the platform for testing are provided by the Mi Family to a large number of valued users? The total number is 3. Welcome to use this product as a worthy friend to apply for trial and provide Test experience articles. Test.smzdm.com to see
Because in the comments, there were value-friends who mentioned that there was a black-grid light curtain used by merchants for Xiaomi's group purchase. The price for a 100-inch screen was 3,499. Although there are 100 inches of 4,000 yuan Fresnel screen information, but one is unknown to the purchase channel, and the second is 100 inches still feel small, so go to Ma found the business, found that 120-inch black grid anti-light curtain also buy. So immediately set a single order:
Because it is the group within the group to drive the price, the group owner emphasized that the price should not be exposed, so the code, I can only say that the entire network may be the lowest 120-inch black light curtain. Because I don't have the point of frequent logistics in the store, the store sent the goods directly with SF, because the store also provided an on-site installation service. Therefore, it was afternoon that the curtain arrived at the local office. It was thought that the curtain could be sent to the next day, and immediately contacted the customer to arrange the installation. More than 7 o'clock in the morning on the next day, I received a call from the screen installation and said that it was at 12 noon. However, SFG still had no delivery at 10 o'clock. The contact said it was too long. They couldn't arrange a big cart to send it. They had to be in the afternoon as soon as possible.... Contacting the master who installed the curtain, the master said it was already approaching. (The master arrived in Jinshan from Jiading, and he was embarrassed to let him wait until the afternoon). So only contact a friend to help open the Department of Daquanshun, to SF point to the curtain back.
The results saw the box label written ZHKB-100, a psychological surprise, it is difficult to send the wrong goods into the store, and sent me 100 inches over? Immediately after unpacking the lower dimensions, it was confirmed that it was 120 inches and it took a long breath.
The installation of the younger brother is also very serious and responsible, because the road is far, so he was sent alone, so he was tossing more than an hour before and after. And the curtain frame bought this time is also much better than the one before me. Apart from the addition of a support bar to prevent deformation in the middle of the frame, the surrounding trim strips are also flocked on the front and side. And on the back is to wrap up all the springs, it is a sub-price goods, goods than goods have to throw ah.
After installing the wall is a gray feeling, the perception is certainly not as good as Fresnel screen kind of LCD TV screen feels so good.
It can be clearly observed under the macro lens that both sides of the microprism are black and white, respectively (YiLi's black-gate anti-light material is used).
The piece of curtain that was previously purchased is a diamond structure and has not been specially optimized for ultra-short focus (black screen and Fresnel screen are only applicable to ultra-short-focus projectors). Nonsense is not much to say.
Do not pull curtains during the day (shooting time is around 13:00 in the afternoon and the weather is cloudy):
The photo of the diamond-shaped light-resistant curtain was taken with the photograph taken during the last public test, so the ambient brightness and the color temperature were different from those of the shooting. However, the gap can still be seen. The first is the color. From the red and black squares, we can see that the color saturation of the black grid anti-light curtain is much higher, followed by the contrast, which is also the high contrast of the black grid, and finally the brightness. I will not say anything. . Everyone saw that it should be different. Even though the black grid anti-light curtain does not have good resistance to the light on the left and right sides, in fact, after filtering the sunlight reflected from the ceiling, it still has some effect on the improvement of the screen effect. The exposure was adjusted to be consistent, and the actual perception is closer to the following (only exposure -1EV adjustment):
Contrast is still somewhat inadequate, but you need to know that the shooting time is almost the strongest day in the day. If you wait until 5 o'clock, the effect of the entire picture will be very different.
Pull curtain effect during the day
As you can see, at this time, the Mijia Laser Theater has a 120-inch black-grating light curtain that can be used as a TV even if it does not pull curtains. If you recharge the media to write an evaluation, you can measure it in this time segment, and then write: “Even if there is a large floor-to-ceiling window in the daytime without shading, the XX brand projector will be able to watch normally without fear of the sun.... We watched during the day. Let's take a look at the contrast in a fixed light environment and see how far apart the two curtains are.
Although the exposure combination of the two shots is the same, the brightness and color temperature of the actual screen are still somewhat different. Everyone depends on the brightness, contrast and color saturation of the screen. The contrast seems to be even better with the black screen, especially because of the high contrast, which makes the projector look normal even when the light is turned on, but because of the reflection imaging, the image looks more like a picture, not a television picture.
In the end, let's look at the comparison of the lights under the off conditions. The relationship between the two is as follows:
In the dark environment, the difference between the two curtains is not so big, but if it is only used in a dark environment, why should we buy any anti-light curtain. However, the corners of the diamond-shaped light curtain lose their light, and the light spots at certain angles disappear.
Through the evaluation, we can see that even in a living room with a good lighting environment like the landlord's house, the Mijia Laser Theater is able to achieve good results with the use of a black light curtain, although it is still impossible to pull the curtains on a sunny day. But at least in the evening, you can watch the lights unscrupulously.
With regard to the gap between the Fresnel screen and the black light curtain, because the landlord did not have the financial resources to purchase a Fresnel screen for testing (mainly because it was bought without a projector, or if it was not for Aunt Zhang), this borrows a comparison chart from the store for reference:
The store's test environment is brighter than normal homes, with large windows on the right side of the screen. At the bottom is the Fresnel optical screen (88 inches). The black piece of plaster is a black screen. The side of the screen is a white curtain. It can be seen that Fresnel is in contrast to the black screen in a strong light environment. Still have great advantages.
Write last
Many people think that it would be very cost-effective to use a projector with 9999 yuan for a screen with a value of about 2/3 or more. However, the fact is that the true value of an ultra-short-throw projector can only be reflected by the corresponding curtains. Can really use the projector as a TV. Relative to millet, the ultra-meter projector + black-grilled curtain tying may be more acceptable. However, the total price of the 100-inch black grid light curtain + Mijia laser theater should be able to be controlled within 14,000, and even if the meter A1 counts the 3,000 yuan discount for the reservation, it will also have to be 1,9999 yuan. The difference between the two is 5,000 yuan. How big is the difference between the two, and I look forward to someone who can make a comparative evaluation with the screen.
As anxious to write a good article for everyone's reference, so what the photo shoot is not a special intention, but also hope everyone forgive me.
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