In the previous Zhongwenwen commentary, value-friends have “reproached†that the landlord did not assign a special ultra-short focal-resistance screen to the “Mijia Laser Projectorâ€. All of them accounted for such a large amount of money measured by the public, got a free laser projection, but also refused to pay more, so that the majority of value-friends more clearly understand the true level of the "Mi-House laser cinema." On this point, although the landlord felt a bit embarrassed, it was indeed impossible to argue. Therefore, before the “Miaji Laser Theater†crowdfunding shipment and formal retail, we will bring you an original “Miaji Laser Theater†with a black light curtain for the reference of the original guy, so that everyone can A good understanding of the commonly known "millet laser television" can not be used as a TV after using a dedicated curtain, this is probably the first review of the entire network "Mi Jia Laser Theater" with a black grating anti-light curtain.
There are two main types of anti-light curtains used for ultra-short-focus projectors. One is a black grid anti-light curtain that comes standard with nuts and meters A1/A1pro/T1, and the other is used by Hisense laser TVs. Fresnel screen, the following first from the structure to say what these two screens are different:
Black/White Lenticular Technology
The structure of the black grid anti-light curtain is, as its name suggests, a black grid. On the surface of the black grid, a very small prism structure is covered horizontally. Its role is to absorb and not reflect the light from the top of the screen. The main reflection is from the bottom of the screen. Light to achieve the purpose of light resistance:
This is a sectional structure diagram, we can see from the figure, the main light-resistant function is from the surface of the protruding triangle, in which the top of the triangle is a black light absorption layer, the bottom is a white reflective layer.
In order to better show everyone the characteristics of the black light curtain, I purposely made a GIF for everyone to see:
Everyone can clearly observe that when looking down at the screen, with the change of angle, the color of the curtain will become black, and when looking upward, the whole screen will change with the angle. Become completely white. However, such a horizontal structure can only withstand the light from the top of the screen. If light sources illuminate the screen on both sides of the screen and on the front surface, the light-resistance effect of the black grid light curtain will be greatly reduced. In other words, only when the ceiling light is used for projection at night, the black light curtain can exert its maximum light resistance effect. Take Yili StarBright CLR screen, which is the most common in the domestic market, for example, its light resistance to top light reaches 95% (US official website data, Chinese is 93%), but the angle can reach 180 degrees. However, the screen brightness gain is only 0.6 (the Chinese website is 0.8).
Of course, in addition to Yili, there are other brands that produce the same type of curtains, and there are also many brands that use Yili's curtains to produce their own curtains. For example, the landlord purchased the nail technology black light curtain.
At present, the maximum size of the 16:9 black grid light curtain is 120 inches, which is 2.65X1.49 meters. The larger size black grid anti-light curtain is not yet on the market, but it is estimated that it will soon be available.
However, it should be noted that the surface of the black grid anti-light curtain is very delicate, can not be folded, nor can it suffer from a hard object collision, otherwise it will damage the prism structure on its surface.
Fresnel Lens TechnologyThe Fresnel lens is an optical structure that has a wide range of applications. Its main function is to collect light (such as the Fresnel viewing screen commonly used on double-reverse cameras).
Its characteristic is that the surface of the screen is covered with a concentric circular pattern from big to small. However, its application on the projection screen is not a lens principle, but a reflection similar to that of the black grating anti-light curtain. The principle of absorption on one side only changes the horizontal structure of the black grating into half a concentric circle to resist The light on the upper side and the left and right sides of the screen also resists all the light except the direction from the projection.
Of course, the Fresnel screen is not just a single concentric structure, it also adds soft mirrors, colored layers, and hard glass surfaces:
Therefore, although the Fresnel screen has a first class anti-light effect, the price is basically double that of a black screen of the same size. And because the optical structure is more complicated, it can only be made into a hard screen that cannot be curled. No matter if it is difficult to transport or install, it will be much higher than the black screen, so its largest size is currently only 100 inches. At the same time, since the light from both sides of the screen is absorbed, Fresnel's viewing angle is also greatly reduced compared to the black screen. Take the dnp SupernovaTM STS screen as an example. The viewing angle is only 50 degrees:
Well, it can be said to be a very small 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 plus the use of a soft screen, the brightness gain of the Fresnel screen is very good and can reach 0.9. With regard to the use effect of Fresnel screen, you can refer to the evaluation of this site's value-friends@hpc1984:
# The original innovator # simply evaluate my own Optoma laser ultra-short-throw projection and Hisense Hisense Fresnel light curtain purchase reasons laser ultra-short-throw projection began to pay attention as soon as the 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 With regard to Fresnel's screen price, there are value-friends in the landlord's testimony mentioned that there are 4,000 yuan and 100-inch purchase channels, but they haven't been publicly disclosed yet, so everyone can pay attention to them, and there is a need for direct supply.
Here to say the landlord purchased this time the 120-inch black grid light curtain it. Because the Mijia Laser Theater crowdfunded late delivery, so no online evaluation has really used the black light curtain or Fresnel screen. The so-called anti-light curtain purchased by the landlord has a certain effect of improving the picture quality. However, it also said in the public testimony that the two corners of the screen are severely lost in light. If you look obliquely at the screen, the half will be lost. Light. And the effect during the day was not very good, so I always wanted to know how the Mijia Laser Theater matched 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 stressed 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
After the curtains were pulled, the gap between the two curtains further widened, and the black light curtain was in a state where it could be used as a TV. The effect of the diamond light curtain was still unsatisfactory (brightness and contrast are both worrying).
One and a half hours before sunset (around 17:00 in the afternoon on August 17th, Shanghai)
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 It is 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 lastMany 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.