Technical advantages talk about how to achieve high gains on the projection screen-XY Screens-img

Technical advantages talk about how to achieve high gains on the projection screen

by:XY Screens     2021-09-07
Many friends who buy a projector will always find that the brightness of their own machine is not enough, resulting in a good effect when the ambient light source is sufficient. Even if the projection screen industry is purchased, the expected effect cannot be achieved. Today we will discuss the problem of projection screens and understand why we can’t achieve the required results after choosing projection screens. In fact, it is not difficult to increase the gain of the projection screen. The key is to solve a series of concurrency problems after increasing the gain.   First is the angle of view (here refers to 2 times the half gain angle) problem   The energy of light is conserved, and the increase in gain will inevitably lead to the decrease and narrowing of the angle of view, and it is useless if it is narrowed to a certain extent. For example, the glass bead screen has a gain of more than 2 times, but the viewing angle is less than 30 degrees. People standing and sitting, looking directly and from the side, the projector has different effects. Although the viewing angle of the metal screen is obviously improved, it can't exceed 60 degrees. If it is made into a flat screen, there will be a dark and bright sun effect around it. This is why the metal screen has to be made into a spherical or curved surface. The normal and reasonable viewing angle should be above 90 degrees, that is, 45 degrees on the left and 45 degrees on the right. Only a wider angle than this can satisfy the family user's 3+1+1 sofa in the viewing angle range, and can ensure that the participants on the left and right sides of the conference table can see the picture clearly. For engineering large-screen products, the viewing angle must be above 120 degrees to ensure seamless image fusion. This undoubtedly poses a challenge to technology. The advantage of Aolong Screen is that it is not only one of the very few high-gain screens that can extend the viewing angle to more than 90 degrees, but also ensures that the gain is still not less than 4 times at 90 degrees. When the gain is expanded to 120 degrees, the gain can still be maintained at more than 3 times. In other words, with the same gain, Aolong Screen can obtain a wider viewing angle. The second is the problem of contrast. After increasing the gain, the white will be brightened, but if the black is also brightened, the contrast will not be improved as needed, and the loss of black will cause a foggy effect and lose the sense of hierarchy. , This is the deadly key to all white screens. We know that the projector can never produce black, this problem can only be solved by the screen. The picture without black is exactly the effect of the white screen you see. But if the screen is made black, such as a gray screen, the white will become darker and the gain will become negative. What we really need is to increase the gain of white and make the gain of black negative; that is, the brighter the white the better, and the darker the black the better. The white brightens and the black darkens at the same time. This is one of the unparalleled advantages that Aolong Screen has obtained through aggressiveness. If a high-gain screen improves white and black at the same time, such as a metal screen, you will find that it can only make you feel dazzling, but will not provide the contrast and comfort you want, just like a white building exterior wall that reflects light in the sun.  The third problem is the degree of color reproduction.  The reason why the traditional white plastic screen is painted white is because the white background color superimposes the light-colored picture to produce a brightening effect. But the result is that all colors are superimposed with white to form new colors, for example, deep red becomes light red, yellow becomes light yellow, etc., and all color gradations are destroyed. On the contrary, the gray screen makes the color darker. Only screens without background colors, such as Aolong projection screens, can display the true colors of the projector. Nothing needs to be changed, nor can it be changed.  The fourth problem is white overexposure.  After the gain is increased, it is easy to lose the grayscale near the white. For example, a white shirt, you may not see its small wrinkles or streaks, thus losing the sense of three-dimensionality and texture. Aolong screen uses micro-crystal display technology to evenly arrange the gray levels in the white area, so that even if the gain reaches 10 times or more, it can still avoid the problem of white overexposure. The fifth is the problem of anti-glare. Glare is also known as hot spot effect or metallic glare. If you look carefully, you will find that there are many small and eye-catching bright spots on the screen, and there are many sand-like black spots around it. Symptoms of tearing, dizziness, and vomiting occur. This is because some of the visual cells on the retina feel burns from bright spots, requiring pupils to shrink, while other cells feel black spots, requiring pupils to expand, and the optic nerve transmits both at the same time, which are completely opposite. The signal causes confusion in the nerve center, causing various symptoms of discomfort. Metal glare is one of the main problems faced by metal screens. Aolong screen uses the multi-level reflection of microcrystalline particles to make the reflected light uniform and soft, avoiding scorching bright spots and surrounding black spots, so as to achieve the purpose of eliminating glare.  The principle analysis of glare produced by the metal screen is shown in the figure below. You can think of the surface of the metal curtain as a miniature 'glass curtain wall'. Each metal reflective particle is equivalent to a tiny mirror. The projected light is reflected in a mirror surface on it and then directed in different directions. When the light reflected by a mirror is positive When looking at the human eye, the human eye feels strong reflection, forming a bright spot. The light from the other mirror next to it faces other directions, and the human eye sees a black spot before it enters the eyeball. This is the principle of metallic glare. When the light is projected on the surface of the Aolong screen, each beam of light undergoes multi-level refraction and reflection, and is decomposed toward various directions, which not only widens the viewing angle, but also eliminates bright spots and black spots, thereby preventing glare produce.   In short, high gain technology is not as simple as imagined. Only superb technology can provide a comprehensive solution.
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