[Home Theater Network] Everyone may look down on the impact of a thin screen on the overall large picture. Some people even think that it is not wrong to use a white wall to make a curtain. In fact, a lot of knowledge is hidden inside the thin film. There are many types of curtain materials, and the appearance of gray screens is mainly designed for digital projectors. It adds a layer of gray material to the white curtain to make the black color reproduce deeper. The digital projector uses a single-tube bulb. When the image appears completely black, the bulb will not turn off, so it cannot reproduce absolute black like a _--gun. The gray screen can improve the image of the digital machine that is not black enough. In the end, does the digital machine have to use a gray screen? I hope to discuss with you here, talk about the characteristics of the gray screen, and the superiority of the white screen.
Can't the gray screen reproduce the correct white?
People often misunderstand the gray screen, and think that the white color reflected by the gray screen is not white enough. In fact, the white is not white enough because the brightness of the projector output is not high, and it is matched with a low-gain screen or a screen with a too large size. This is a problem of mismatching. Regardless of whether a gray screen or a white screen is used, if the selection is not appropriate, white may not be white enough. The high-gain gray screen can be whiter than the low-gain white screen, so please don't doubt the pure self-inductance of the gray screen, because the pure white color depends on whether the light reflected from the screen by the projector can provide enough brightness. .
Is the color of the gray screen not pure?
Another misunderstanding is that the colors reproduced by the gray screen are incorrect and have a color cast. In fact, regardless of the white ash, different screen materials have different color temperatures, which means that the 6500 K bulb is used to shoot the screen. The reflected light may be 5500K, 6500K or 7300K. Depending on the color temperature of the curtain material, the white screen may also have a gray screen. Same or different color temperature. I used to compare the performance of Stewart Studiotek 130 and Grayhawk in the same environment, projector, DVD player and settings. It is found that the average color temperature of the Grayhawk is higher than that of the Studiotek l30 by about 838K. In the same-set situation, you will find that the gray-screen Grayhawk is biased toward blue, or conversely, the white-screen Stdiotek l30 is reddish. This is just the result of the same setting on the spot. If you use different settings to match Stdiotek and Grayhawk, both can get the correct 6500K color temperature. Therefore, the adjustment of the projector should be changed according to different screen materials.
Comparing the CIE Chart, we found that the coordinates of the red, green, and blue colors of the three primary colors are the same for both Stdiotek and Grayhawk. If the gray screen is made of a pure gray coating, the gray itself will not have color tendency and deviation, so you don't have to worry about the color cast of the high-quality gray screen.
The advantages and disadvantages of the gray screen
The benefits of the gray screen, in addition to making the black deeper, add to the contrast, and it resists the reflected light of the environment. Compared with the white screen, the gray screen is less affected by the reflected light, which is very suitable for the ordinary home environment, and the space around the dark diffusing surface cannot be used. However, the gray screen also has undesirable side effects. The coating on the surface produces a layer of interference such as a light yarn, which means that the texture of the surface layer can be seen in the normal viewing distance, which has affected the sharpness and sharpness of the picture. In the face of today's high resolution projectors and high-definition sources, it is especially important that the screen material will produce interference patterns. Hong Kong's home environment is relatively thin, and the viewing distance of the large face is about 10 to 13 feet. At this distance, if the curtain is not fine enough or the surface coating cannot be invisible, the interference pattern will be easily presented. If your viewing distance is fifteen feet or more, the problem is not big and it is not easy to be disturbed by the curtain.
Gray's light reflectivity is lower than white, so the gray screen should focus the reflected light at an angle, and the reflection can reach the same gain as the white screen. As a result, the white gain ratio of the same gain is narrower, that is, the half gain angle is narrower. The viewing angle is narrow, and the illuminance is uneven. The projector flashes a hotspot like a flashlight. The solution is to install the projector in the rear position as much as possible to minimize or lengthen the zoom lens. Shot of the shot.
Home theater network summary: the use of gray screen can enhance the contrast, enhance the stereoscopic effect, make the black deeper and resist the surrounding reflected light, is a good helper for liquid crystal projectors. To suppress its adverse side effects, a certain projector distance is necessary. If you are in a narrow home theater, the user must decide whether to use a gray screen between its advantages and disadvantages.
The high-gain white screen (1.5 or more) may also have the same side effects as the gray screen. The white screen with 1.5 gain or less is safer and has fewer side effects, and can be flexibly matched with projectors in different installation positions. Although the white screen does not have the special function of gray screen, but I also compare with the gray screen of the same gain, I always think that the color of the white screen is more transparent and bright. In recent years, some manufacturers have introduced a negative-gain white screen to enhance their light-absorbing ability and deepen the effect of black. This is another solution.
If I ask my personal opinion, I tend to choose a better projector and work hard on the light absorption of the environment. In this case, using the white screen, I think it is a more balanced choice. However, if the limitations of the environment cannot be resolved, the gray screen has its value. As long as it pays attention to its application characteristics, it can exert its advantages and reduce its side effects. We welcome manufacturers to develop different types of screen materials to cope with different projectors and environments, which can increase the user's selectivity. In recent years, digital projectors have continuously increased the contrast ratio, and it is not necessary to match the gray screen. Choosing a gray screen and a white curtain can be said to be a way of pursuing the quality of the image. There is no dispute about the wrong. WeChat: cnhifi.
Langrui Energy (Shenzhen) Co.,Ltd , https://www.langruibattery.com