In the past year or so, the projection wind in the home theater has been really strong. With the gradual decline in the price of LCD and DLP projectors, people are not considering how to set up a home theater system. The focus is all on the "listening" part. As for the "view" part, the 29-inch, 34-inch TV is used as the main display, but the budget of the large-screen projection is also regarded as a focus of cinema investment. As long as you look at the relevant fever forums in China, you will know that the selection of projectors on the jars, the matching of the front projection screens and the adjustment of the screens are all very heated discussions. Later, with the further development of the technology, the projectors There will be no small price drop, and more and more AV enthusiasts will join the projection family. It seems that the large screen projection wind blown up in the home theater will inevitably become more and more powerful, and also has a good prospect.
The projector can be roughly divided into two types: front projection and rear projection. The projection size is adjustable for the front projection and the fixed projection for the rear projection. The size of the front projection is generally 60. Inches to 250 inches, and the rear projection can't be done much, 60 inches or so is already big, because this article mainly talks about the choice of curtains, and has little to do with rear projection, and my personal opinion is currently The size of the rear projection is still too small, so I won't talk about the rear projection here, just talk about the related issues of the front projection. At present, there are three types of front projections commonly used in home theaters, one is LCD LCD projector, the other is DLP projector, and the third is CRT three-gun projector. Here, LCD and DLP use the light bulb in the projector as the light source. The three-gun projector is scanned and reproduced by three electron guns of R, G, and B. The former two can generally be made very high in brightness index, and can easily be hundreds or even thousands of ANSI lumens, but three-shot projector. The brightness index is not high. The three shots of the 7-inch tube are generally 100 to 150 ANSI lumens. Even the 8-inch killer three shots like the BARCO BG808S must be enhanced to reach 220 ANSI lumens, so three shots are required. Compared with the brightness of LCD and DLP projectors, it is really no match, and it is a mess. Well, since this article is about the curtain, then according to the brightness of these kinds of projectors, then we can draw a conclusion that because the brightness of LCD and DLP projectors is very high, then when we choose the curtain It is necessary to choose those low-gain screens, and because the three-gun projector is not high in brightness, then we have to choose those high-gain screens? Well, it sounds very reasonable. LCD and DLP use low-gain screens. No problem. In fact, I also played two SVGA-level liquid injections last year. SANYO's SW20 and ASK's C85 are in my audition room. In the comparison of various screens, from the results of the actual test, it is true that high-brightness projectors such as LCDs must use low-gain screens to achieve good results, otherwise the disadvantages of LCD congenital black floating will be more obvious. Some films with more night scenes may even give people the impression that they can't make a big impression. In order to improve the black performance of the LCD, even a negative gain screen is a good choice.
As for the three-gun projector using a high-gain screen to improve the brightness experience, from my own experience using the SONY1001QM three-gun projector, it is not a good way. At present, the curtains that we often find on the market, there are two kinds of materials, the most common bead curtains, and white plastic screens, in addition, such as metal curtains, etc. will not be discussed here. In terms of the process of the curtain, in fact, the bead curtain is based on the white plastic screen, and some small glass beads are reflected on the surface of the curtain to reflect the light. The more light is reflected, the smaller the diameter of the bead is required, and the curtain is required. The gain is also higher. The white plastic screen is a low-gain screen. Its gain is generally 1.0 to 1.5, and the bead curtain is naturally a high-gain screen. Its gain is generally above 2.0. So what is wrong with the projector using a high-gain screen? Do merchants often recommend the bead curtain? OK, it depends on how you use it, if you buy it for use in a high-brightness environment. Under the commercial presentation, then no problem, the glass bead curtain is very good, but if you are using it for home theater, sorry, the bead curtain performance is very bad. Everyone knows that the curtain itself is not luminous, it only reflects light, and the white plastic screen is diffusely reflected by light, so its entire screen is very uniform in brightness, and the viewing angle is also large, and the bead curtain is actually projected. The light is concentrated back to the central area, and people have a feeling of brightness improvement in the middle, but the angle of view is very narrow. Once the center is deviated from the central area, the brightness is very bad, and the overall brightness uniformity is not good. The brightness will be slightly darker than the middle, and the bead curtain actually costs the brightness uniformity and viewing angle to enhance the brightness of the person. The brightness of the three shots is low. Is it not good to use a high-gain glass bead? To be honest, it is not good. For the three shots, in addition to what I mentioned above, there is another shortcoming of the glass bead curtain, that is, it will also enlarge the three-shot congenital color cast phenomenon. Let me talk about what is the color cast of the three guns. The three guns are red, green and blue. The three electron guns project the image to form a picture. Then, on the side close to the blue gun, it will be slightly bluish, and close to the red gun. In order to solve this problem, we can see that there are players who use the dual-gun projection method. One hoisting a front projection, in addition to increasing the detail of the image, it can also solve the problem of color cast. . When using only one shot, the bead curtain will show this color cast more clearly. When you project a white background image, you can clearly see this. The blue gun has a blue side and a red gun. One side is reddish.
Since the brightness of the three shots is low and you can't use a high-gain screen, what good is it? Its practical white plastic screen is fine. As long as there is no negative gain screen, I have seen several brands of white plastic screens. The gain of the screen is only 0.9, and the precious brightness is eaten again. This is not very suitable for three shots. I think the screen gain is 1.0 to 1.5. In fact, as long as the color of the projection tube is still good, the screen with a gain of 1.0 is ideal because it can almost completely eliminate the color cast of the three shots. There may be some friends who are worried. With the brightness of three shots, and the screen without gain, the image will not be too dark to see the details. Here I think it is necessary to say a few words about the brightness of the three shots. The brightness of the three shots is low. As everyone knows, the overall brightness of the screen is indeed darker than that of the LCD and DLP projectors. However, one of the characteristics of the three shots is that the brightness is very high, that is, the image projected by three shots. The dark place can be very dark, because the black on the screen is the part of the projection tube that does not emit light. As long as the shading is done well, the black is very deep, and its instantaneous brightness is very high. The place is very bright, the reproduction of the grayscale is rich, the contrast is unmatched by LCD and DLP, so the three-gun with a non-gain white plastic screen is very suitable, although the overall brightness of the picture is not high, but it looks closer to The brightness feeling in the cinema, as long as the projection size is well controlled, the picture quality is adjusted with the test discs such as "Avia", the details will never be missing, the picture is very beautiful.
Although the low-gain white plastic screen is suitable for home theaters, the white plastic screens with very good size and gain in the market are not easy to buy. The demand is not comparable to the commercial glass bead screen. The big reason. It doesn't matter if you can't buy it, because we can use our own wall DIY to make a "hard curtain" suitable for the size of our own needs. Of course, the friend who projects in the direction of the window only gives up the idea. In addition to the size of the wall, the wall is diffuse, the gain is almost 1.0, which meets the requirements of the screen gain. In addition, the wall curtain is generally also flat, not like the operating time of some electric screens and brackets. It will wrinkle and affect the look and feel, and we can control the background color of the wall curtain by ourselves, and use the optional paint and paint to bring out the screen color that is most suitable for our projector. At present, I use an 80-inch 4:3 hard screen using DIY on the wall in the audition room. The background color is painted with a general paint white, but the projection result with three shots is honestly compared to the average parity effect. It must be a good one, the color of the three shots is invisible, the overall picture brightness and details are good, the color is very full, the black is deep and deep, if the three-gun player can not find a satisfactory curtain for the time being, it can be In this regard, buy a DIY 16:9 curtain, set the output of the DVD to 16:9, and use the vertical compression method to change the projection screen to 16:9, so that you can make the most of all. Scan lines to further improve the clarity of the three shots. The only thing to note is that the three-shot three-color convergence at the four edges is generally difficult to achieve 100% perfection. It is inevitable that the color will seep out. The black edge of the curtain will cover up the color, and the wall will appear. Come out, so it is best to use four black strips or wooden strips with a width of 5cm to make a curtain on the wall. It is beautiful and has a feeling of curtain. Secondly, it can completely cover the color. LCD projector's main wall curtain is best to pay attention to the choice of the color of the wall, white is not necessarily the best, gray or yellow is the best, in the match of this background Under the black, the black color of the LCD will sink deeper, in order to play the best state of the projector. Since LCD and DLP do not have the problem of three-color convergence, it is not necessary to consider the screen.
As for the adjustment of the picture, I would like to say a few words, because there are not many articles about this knowledge, and for many friends who have only entered the projection door, it is very useful to know more about this knowledge. A projector that we can adjust to, usually contrast, brightness, color, hue or tint, and sharpness. Some projectors also provide The setting of the Gamma value in the machine, the setting of the color temperature, the three guns and the G2 voltage adjustment problem, only the adjustment settings of the first five items are mentioned here, because the latter items are specific to the projector used. When we adjust the first five settings, we assume that the Gamma value has been set to the appropriate position. Before making these adjustments, please buy the two discs "Avia" and "Video essentials" first. If you can't buy them, you can use the DECESS version. There are also several publishers in the country. A DVD with the above two disc debugging contents can be found if it can be found.
Before the adjustment is made, the projector is turned on for half an hour. For the three-gun projector, the heat engine is more necessary, because only the equalization of the three-color convergence and color performance will be normal. After the hot machine is finished, the clip on the disc about how to adjust the video is played. The original version is a conversation between a man and a woman. After reading it, you can have a general understanding. We first adjust the contrast of the projector. When adjusting the contrast, we need to play the Needle pulse Steps screen. You can notice that there are two swaying white bars on the lower left of the screen. It is used for plasma adjustment. Let's not take care of it. For the introduction of Avia, we need to observe the five long squares stacked in the picture. When adjusting the contrast value, pay attention to the junction between the top white block and the one below it, and raise the contrast value to the edge of the junction. At the point of the most condensed, critically fainted, and the size of the five long squares is the same, but to be honest, it is really difficult to judge by projection. I think it is OK to look at the two straight lines on both sides. To adjust the contrast value to the black line in the black block above and the black line in the white block below, do not twist, and the line body is also the same thickness, together with the introduction of Avia, should be able to adjust the contrast value. Then adjust the brightness, then use the brightness check chart to play this check chart. The right side of the picture is the entire white area, the left side is the black area, and the black area is actually arranged with two swaying black and light gray Vertical bar, adjust the brightness value at this time, so that the black bar on the left just disappears into the background, and the gray bar on the right is faintly visible. Because the contrast and brightness are linked, after adjusting the brightness, you have to go back and see if the contrast value is appropriate. Repeat the adjustment of the contrast value and the brightness value to the place where the requirements are met. After the contrast and brightness are adjusted, it means that we have adjusted the white vertices (determined by contrast) and the black bottom line (determined by the brightness value) to the most suitable position, and achieved the maximum dynamic in white and black. Range, the performance of the grayscale image will naturally be more fascinating.
Next, you need to adjust the color saturation and hue. Remember to zero the sharpness value first, so as not to affect the color performance. If it is an LCD or DLP projector, you must use the blue filter for these two tasks. No, but if it is three shots, it doesn't work. Because of the saturation and hue, we only need to adjust the amount of blue. Then turn off the red and green guns. Please use blue for LCD and DLP. The filter is attached to the front of the lens. Play the SMPTE ribbon chart. When adjusting the color saturation, please pay attention to the two blue bars marked with “Saturation†on the top. Adjust the color saturation so that the upper and lower lengths of the blue bar are basically the same brightness, that is, it looks like One does not have a segmentation. Then re-color phase, then look at the middle two blue bars marked "Hue", adjust the hue value, so that the upper and lower lengths of the blue bar are basically the same brightness, do not see the obvious segmentation Traces, according to the requirements of "Avia", actually let the words "Saturation" and "Hue" that have been flashing seem to have hidden into the background, but to be honest, this is very difficult to do, perhaps only broadcast-level The monitor can do it. After adjusting the hue, you have to go back and check if the color saturation is still satisfactory. If you can't do it, then adjust it until both of them meet the requirements. The final adjustment is the sharpness. The main function of the actual sharpness is to compensate the details of the loss when the image is converted from NTSC to RGB. When using the S terminal, the sharpness compensation value is not needed. If it is used, it will be reversed. Bring a lot of noise, then the sharpness is not necessary, just use a little bit on the line, use more fonts and image edges will appear obvious ghosting chrome, the specific use depends on your requirements for the picture, My experience sharpness value is below 20.
If you adjust the position according to the steps mentioned above, the picture must be very beautiful, the projector's strength also has the opportunity to get the best play, with the appropriate screen, the big screen home theater experience will definitely make you strong Satisfaction, there is an impulse to find someone to share. The above mainly talked about some methods related to projection screen and image quality adjustment, which are all summed up in the process of playing the projector. If you are the user of the projection, it is just the screen that you are using. If you are not satisfied, you may wish to try it out. Anyway, a DIY wall curtain and a hands-on screen will not cost you a lot of things. Moreover, the results of the test are believed to make you happy.
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