In the previous commentary on the Zhongwenwen, the issue was raised by value-friends regarding the lack of a specialized ultra-short focal-length resistance screen for the "Mijia Laser Projector." Some felt that paying such a significant amount of money for a free laser projection system was unjustified, especially since they felt they shouldn't have to pay extra for a better experience. This led to a discussion on how the "Mi-Jia laser cinema" performs in real-world conditions. While the landlord felt somewhat embarrassed, there was no real argument to be made against the criticism.
To address this concern, before the "Miaji Laser Theater" crowdfunding shipment and official retail launch, we will introduce an original "Miaji Laser Theater" paired with a black light curtain for your consideration. This setup aims to give everyone a clearer understanding of whether the commonly referred to "millet laser television" can truly function as a TV without a dedicated curtain. This might be the first comprehensive review of the "Mi Jia Laser Theater" with a black grating anti-light curtain across the entire network.
There are two primary types of anti-light curtains used for ultra-short focus projectors. One is the black grid anti-light curtain, which comes standard with models like the nuts and meters A1/A1pro/T1. 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, as its name suggests, a black grid. Horizontally placed on the surface of the grid are very small prisms. Their role is to absorb and not reflect light coming from the top of the screen while reflecting mainly light from below, achieving a light resistance effect:
This is a sectional diagram showing the structure. We can see from the image that the primary light-resistant function comes from the surface of the protruding triangles. The top of the triangle is a black light absorption layer, while the bottom is a white reflective layer.
To better illustrate the characteristics of the black light curtain, I’ve created a GIF for everyone to see:
Everyone can clearly notice that when looking down at the screen, as the angle changes, the color of the curtain turns black. When looking upward, the entire screen becomes white. However, this horizontal structure can only withstand light from the top of the screen. If light sources illuminate the screen from both sides or the front, the light-resistance effect of the black grid light curtain will be significantly reduced. In other words, the black grid curtain can only fully exert its light resistance effect when used with ceiling lighting at night. For instance, the Yili StarBright CLR screen, which is quite common in the domestic market, has a top light resistance rate of 95% (US official website data, 93% for the Chinese version), but the viewing angle can reach 180 degrees. However, the screen brightness gain is only 0.6 (Chinese website data is 0.8).
Of course, in addition to Yili, there are other brands producing the same type of curtains, and many brands use Yili's curtains to produce their own versions. 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, 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 shelves soon.
However, it should be noted that the surface of the black grid anti-light curtain is very delicate; it cannot be folded and cannot withstand a hard object collision, as this could damage the prism structure on its surface.
Fresnel Lens Technology
The Fresnel lens is an optical structure with a wide range of applications. Its main function is to collect light (such as the Fresnel viewing screen commonly used in 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 based on lens principles but rather 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 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 adds soft mirrors, colored layers, and hard glass surfaces:
Therefore, although the Fresnel screen has excellent anti-light effects, its price is basically double that of a black screen of the same size. And because the optical structure is more complex, it can only be made into a hard screen that cannot be curled. This makes transportation and installation more challenging, and its largest size is currently only 100 inches. At the same time, since 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. For example, the dnp SupernovaTM STS screen has a viewing angle of only 50 degrees:
Well, it can be said to be a very small angle. If you look at the screen from this angle, it 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. Regarding the use effect of the Fresnel screen, you can refer to the evaluation of this site's value-friends@hpc1984:
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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 went 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
One and a half hours before sunset (around 17:00 in the afternoon on August 17th, Shanghai)
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 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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