1, Q: HDMI line is one or two hundred dollars, there are six or seven hundred, it is necessary to buy expensive? 
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Old Snail: According to your price, I guess it should be 10 meters in size. From the perspective of market conditions, six or seven hundred pieces are reasonable. I personally do not recommend buying one or two hundred cheap goods. Some people say that the HDMI cable is a digital signal, nothing more than the difference between 0 and 1, I can tell you responsibly, absolutely not so simple, poor line not only short life, poor anti-interference ability, high failure rate (especially The most common problem is the poor compatibility. If it goes wrong, it will lead to color cast, signal noise, etc. Even images may not be transmitted. Especially when the HDMI cable exceeds 15 meters. It's even better to be greedy and cheap, and try to get fiber optics as much as possible.
2. Q: What is the best material for the curtain? (suitable for the best)
Old snail: To know what the material screen is good, you must first know the different characteristics of different curtains. Take the common ones as examples: The white plastic curtain is basically the lowest-end product on the market, which is characterized by low cost; white glass fiber The curtain adds a layer of coating on the base layer of the fiberglass. Because the base layer has a certain hardness, it is generally used as an electric curtain. The feature is that the gain is relatively high, the price is moderate, and it belongs to the family commonly used type; the white soft curtain is a special PVC material. Produced with good brightness and bright colors. It can be said that it is the best material for curtains. This kind of curtain is suitable for professional audio and video rooms with good shading. Because the material is soft, it is generally used for frame curtains. If used in the living room, , can also be made pull wire screen.
The sound-sounding screen, as its name implies, does not block the sound curtain. It is generally used in high-end private theaters. The front speakers can be hidden behind the curtain. The advantage of this is that the curtain can be made as large as possible, and the sound positioning is more accurate, but it should be noted that the low End-of-sounding curtains have a relatively large attenuation of sound, and conditions are best used.
There are also new types of metal curtains that are also high-gain curtains that are suitable for situations where the brightness of the projector is not sufficient. In addition, there are many brands that have introduced new types of high-contrast, high-contrast light curtains, which are more suitable for living rooms and other serious ambient light scenes. .
To sum up, what is suitable is the best. If it is an all-black environment, the white soft screen has the best picture quality.
3, Q: Why is the ambient light stronger than the projector can not see? (The most important contrast quality, black level decision)
Old Snail: The most critical parameters that determine the quality of home projectors are contrast, sharpness, color gamut, and brightness. The current mainstream of sharpness and color gamut is that 1080P and REC.709 are inherent properties of the projector, and will not be discussed first. Brightness is the basic condition, there is no brightness, everything is empty talk, but high brightness is necessary to sacrifice the contrast, which is why most home projectors will not be too bright, and generally will not exceed 3,000 lumens. The contrast determines the difference between the darkest part and the brightest part of the picture. The higher the contrast, the more detail the picture can show. For example, the lipstick in a 4K test piece looks low in contrast. Red, and the higher the contrast, the more colors you can see: pink, red, red, red berries...
Back to the very beginning, if the ambient light is strong, why can't the picture look? It's easy. The strong ambient light destroys the contrast between the darkest and the brightest. The effect of the projector has instantly changed to thousands of levels...
4, Q: What is the best of laser and traditional projectors?
Old snail: Because the early projector technology is not mature, there are many low-end bad projectors that give people the impression that the quality of the projector is far worse than the LCD TV. I can responsibly say that as long as we are willing to spend money, the projector effect is If you don’t lose a TV, laser ultra-short-focus projectors (laser televisions) are arguably the traditional telephoto projectors that evolved in response to strong ambient light living room scenes. Can largely solve the traditional projector screen see light dead problem, which can not only meet the living room environment, there can be far more than a flat-panel TV, get a huge video screen, of course, the disadvantage is not no, it is expensive.
If a laser over-investment value is worth 40,000 yuan, I think at least 30% of the cost is spent on the issue of "light resistance", plus the premium of new products. If ambient light interference is ruled out, the actual image quality effect should be 1.5 on the market. The traditional telephoto projector is about 10,000 yuan, so you already know the answer to this question.
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