Analysis of the necessity of the projection screen: the brightness of the white wall effect is halved?

The topic of whether the projector uses a curtain or not seems a bit idiot, of course, so users who have the conditions will choose to use the curtain to watch the movie. But in fact, especially in daily business, we often project on the wall. In the bedroom and living room, some users choose to use the wall as a temporary projection background because of the area, and use the wall to bear the side effects of the picture. What is it? Will it, like rumors, greatly attenuate the projection brightness? Portable projectors and mainstream 1080P projectors are currently the most selected types by users. At the same time, home projectors with brightness between 2000 and 3000 lumens are more common. In fact, under such high brightness, the projector itself is not too picky about the projection material. Basically it can also meet the demand for reliable picture quality. But is the improvement brought by the screen in terms of brightness, or is it a more reliable picture quality performance than the wall? In the early 1990s, with the birth of home theater, people began to focus on image quality. Earlier the competition between the two neighboring theaters only depended on the quality of the audio. Later, this contest shifted to image quality. Whether we can get high-quality and clear images, the effect of the curtain is far beyond our imagination. Buying a projector is already a big expense, and buying another projection screen will be part of the expense. Therefore, many people will ask from the bottom of their hearts: Can a white wall replace a projection screen? The answer is simple: yes! However, this is like adding low-standard gasoline to a high-end sports car. Although it can also run, it can't get excellent performance! The two biggest differences are poor reflection performance, easy contamination and no black border. In terms of image quality, the curtain plays a vital role. In the early 1990s, with the birth of home theater, people began to focus on image quality. Earlier the competition between the two neighboring theaters only depended on the quality of the audio. Later, this contest was transferred to the video, so the responsibility of the curtain is also an important part of it. Three major hazards of projection white walls. White walls have poor reflection performance. The projection screen has special optical materials to improve its reflection performance, such as increasing the gain, expanding the viewing angle, increasing the resolution, enhancing the contrast, enhancing the color reproduction and so on. However, the white wall does not have these properties at all. You can compare it with a screen, and you will find that the image on the white wall is not as good as the screen in terms of brightness, contrast, or color saturation. Similarly, to a greater extent, due to the influence of the wall texture, the sharpness of the image is also lost. Even a high-definition projector needs to be matched with a high-resolution screen to obtain a clear effect, just like a brilliant color High-definition pictures, printed on rough paper, the picture quality will be greatly reduced. However, with the increasing brightness of home projections, I personally think that if the home projection exceeds 1500 lumens, the brightness is actually slightly too high in a 15 square meter room, and the white wall just plays the role of soft light. So, of course, you can use a white wall as a projection screen, and you can also get a viewable picture, but it is by no means the best picture effect, but depending on the situation, the white wall is not the worst choice. White walls are easy to be contaminated. Some netizens may have encountered a similar situation, that is, the picture is dirty, flawed or even scratched, and sometimes people mistakenly think it is a problem with the projector. But if you move the projector lightly, you will find that these affected areas do not move with the screen, which means that the wall is left behind. The white wall has been used for a long time, it is inevitable to be contaminated and even change color. The screen can be stowed for protection after use, and some screens can still be cleaned and maintained. These methods will also be shared with netizens in the future. There is no black frame on the white wall. Don’t underestimate this black frame. Recall the projection screens, movie theater curtains, and flat-panel TVs you see, all of which are designed with black frames, and most laptops and LCDs are the same. This small black border, but asked by the university, it can improve the attention and contrast of the picture, and it can improve the visual quality of the picture itself. Remember that in your report, in order to highlight a certain picture, you used a black border to separate it. The same is true for display devices. If the picture is displayed in a black frame, it will appear brighter and more prominent, and the surrounding influence will be avoided. We are saying that white walls cannot replace projection screens, but we do not mean that white walls cannot be used for projection. For some small meeting rooms, it is more convenient to project white walls, but this is usually in informal occasions. If some netizens want to paint the wall in gray to simulate the popular gray screen, first of all you have an understanding of the advantages of gray screen, but I suggest you give up this idea. Except that both are gray, they are completely different things. In short, it is recommended to use curtains for home, teaching, and formal business occasions. In informal occasions, especially in the company's small meeting rooms, when the frequency of projector usage is not high, it is also a good solution to directly use white walls.