LED display application is the LED industry chain in the development of more mature links in recent years with the technological progress and continuous improvement of products, LED display applications gradually widened, showing a stable development of the situation. According to the China Optical Optoelectronics Industry Association LED display application branch statistics show that in 2012 China's LED display application industry to maintain the overall scale of development continues to grow, the industry's annual market sales reached 25.3 billion yuan, compared with 22 billion yuan in 2011 increased by 15%. However, with the continuous development of the industry, the market for all aspects of the LED display put a higher demand, the current industry experts invited experts in the led display test, light pollution, safety design, development bottlenecks and other aspects of in-depth discussion to readers.
Only to meet the information display needs within the perspective of the optical radiation is the effective luminous flux, in order to improve the energy efficiency of the display, should meet the needs of the luminous flux is getting higher and higher.
For the LED display, the output is for the audience to watch the luminous flux. However, unlike other photoelectric conversion devices, not all of the output luminous flux is useful, but only in the specified range of view, to meet the display requirements of the luminous flux is the LED display of the effective light output.
The so-called designated perspective refers to the "LED display general specification" provides different types of LED display viewing angle range or contract requirements of the viewing angle range. Can not meet the "LED display general specification" or the contract requirements of the product failed, and beyond the scope of the energy is wasted, not only that, but also cause light pollution.
How to measure the luminous flux? In order to carry out LED energy efficiency coefficient measurement and comparison, we take the module as a unit of measurement. Module is the basic unit of LED display, large screen is made by many modules stitching. Screen due to the actual working environment differences, may have their own specificity, to compare the energy efficiency of the module will be more scientific and reasonable, more fair and operational. It is scientific and reasonable to measure and compare the modules as well as production management. LED display and the module is composed of discrete LED tube, in the practical value of the distance to watch, it should be surface luminous body, but in the measurement, in fact, is still a discrete LED tube or a beam of LED Tube to measure, and then calculated by calculating the luminous flux.