LED display needs to pay attention to effective luminous flux
LED display application is a relatively mature link in the LED industry chain. In recent years, with the advancement of technology and continuous improvement of products, the field of LED display applications has gradually broadened and presented a stable development. According to the statistics of the LED Display Application Branch of China Optical Optoelectronics Industry Association, the overall scale of China's LED display application industry continued to grow in 2012. The annual market sales of the industry reached 25.3 billion yuan, an increase of 15% over the 22 billion yuan in 2011. However, with the continuous development of the industry, the market has put forward higher requirements for all aspects of LED display . In this issue, experts in the industry are invited to conduct in-depth discussions on LED display testing, light pollution, safety design, and development bottlenecks to readers.
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Only the light radiation within the viewing angle that satisfies the information display requirement is an effective luminous flux. In order to improve the energy efficiency of the display, the luminous flux satisfying the demand should be made higher and higher.
For the LED display, the output is the luminous flux for the audience to watch. However, unlike other photoelectric conversion devices, not all of the output luminous flux is useful, but only the luminous flux that meets the display requirements within the specified viewing angle range is the effective light output of the LED display.
The so-called specified viewing angle refers to the range of viewing angles of different types of LED displays specified in the General Specification for LED Displays or the range of viewing angles required by the contract. Products that fail to meet the "General Specification for LED Display" or contract requirements are not qualified, and beyond this range is a waste of energy, not only that, but also cause light pollution.
How to measure luminous flux? In order to measure and compare the energy efficiency coefficient of LED display, we use module as the unit of measurement. The module is the basic unit of the LED display, and the large screen is made up of many modules. Due to the difference in actual working environment, screens may have their own particularities. Comparing the energy efficiency of modules will be more scientific and reasonable, fairer and more operable. Measurement and comparison in units of modules is scientific and reasonable, and is also conducive to production management.
The LED display and module are composed of discrete LED tubes. When viewed at a practical distance, they should be surface illuminators, but in measurement, they are actually a discrete LED tube or a bundle of LEDs. The tube is measured and then calculated to determine the luminous flux.