Gain and viewing angle are important indicators that affect the performance of projection screens
When consumers buy projection screens, they will find that almost all brands will give two basic optical parameters: gain and viewing angle. These two parameters will directly affect the imaging quality of the projected image, which are two important key factors. Below, Guan Ye Xiaobian will discuss these two key factors to help you understand the most basic performance indicators of projection screens.
Gain is a physical quantity used to measure the efficiency of projection light reflected by the screen. Its production is very strict. First, a magnesium carbonate coating was used as a standard reference coating. The intensity A of the reflected light is measured at the center, and A is set as a standard reference value. Then, the measurement result under the same conditions is set to B, and the ratio of B/A is this value. If the calculated ratio is 1.0, then the value is 1.0, which means that the amount of light reflected corresponds to the value reflected by the standard reference paint. While this ratio is not negative, traditional manufacturers treat calculated values u200bu200bless than 1.0 as negative. Conversely, ratios greater than 1 are called positive. Under normal conditions, fully diffuse light diffuses light projected in all directions uniformly and has a very wide viewing angle. Also, because of viewing habits, people usually say numbers below 1.5 are low and above 1.5 are high. But care must be taken not to confuse the concepts of negative and low, not that all lows are negative.