How to adjust the brightness of outdoor LED display?

  With the continuous development and progress of science and technology, people's requirements for visual effects have become higher and higher, and began to pursue more realistic and clear advertising picture presentation effect, and outdoor LED display as one of the important communication carriers, still glowing with vitality in modern cities, and according to the market demand, can meet the intelligent high-definition at the same time, but also free to control the brightness of the outdoor LED display, will become a big hit products. However, we sometimes need to adjust the brightness in the process of using outdoor LED display. So do you knowOutdoor LED DisplayHow to adjust the brightness? The following Vishay Technology editorial is for you:

  Outdoor LED display brightness adjustment method:

  1, change the current flowing through the LED

  Change the current flowing through the LED, ordinary LED tube allows continuous task current in about 20 mA, in addition to the red LED saturation phenomenon, the rest of the LED brightness is basically proportional to the current flowing through. But outdoor LED display screen of this adjustment method, although simple, but with the gradual improvement of the requirements of the LED large screen, but also less and less adaptable to fast and accurate modulation.

  2、Pulse width modulation method to realize gray scale adjustment

  Mainly through the use of the human eye's visual inertia, with the pulse width modulation method to realize the gray scale adjustment, that is, periodically change the width of the light pulse (i.e., duty cycle), as long as this repeated light cycle is short enough (i.e., refresh frequency is high enough), the human eye is not feel the light-emitting pixels in the jitter. Because pulse width modulation is more suitable for digital control, so in the universal use of computers to provide LED display content today, almost all of the outdoor LED display is to use pulse width modulation to control the gray level.

  To summarize, are two common outdoor LED display brightness adjustment methods. Although, we change the current flowing through the LED, pulse width modulation method to achieve gray scale adjustment of these two methods can be achieved by adjusting the brightness of outdoor LED display, but in order not to affect the normal work and study of others, I hope that we try not to exceed the national standard oh.