Ten face haze volts, red LED shine

Tianjin North emergency emergency!! Tianjin North into a heavy fog, this time is the nature of our bad behavior punished, spring and autumn in North China into a sand filled sand storm, winter haze struck again.

Beijing for decades, finally won the "London fog" of the title, this time "serve the people" has also been friends laugh "Hello people fog". Recently, the Beijing air pollution emergency headquarters issued a heavy air pollution blue warning for the first heavy pollution warning in 2014. Beijing city environmental protection monitoring center data show that the PM2.5 real-time concentration Wan Nishinomiya monitoring points is 623 micrograms / cubic meter, a number of other sites more than 500 micrograms / cubic meter, PM2.5 for the first time this year to more than 500 micrograms / cubic meter.

Haze in the LED display

Days of fog and haze, Tiananmen square, Beijing suffered haze hit the city, Tiananmen square and surrounding visibility is low, poor air quality. In the square LED large screen has been in the open state, in the picture we can observe the surrounding visibility is very low, but the haze is particularly eye-catching LED display.

Why haze red LED?

A survey shows that 60% of traffic accidents have occurred in the night and bad weather, mainly because of the driving line of sight is relatively poor, the vehicle speed is relatively high. Especially in the night there is no street lights and fog on the road is more serious, limited by the distance of the headlight headlights, driving there will be security risks.

LED large screen in the traffic for visual aids, so that the driver in the low visibility or dark clear observation of the information is helpful. So that drivers can remind each other vehicles to avoid travel safer.

Haze LED display

In fog and haze or at night with the red LED large screen. Because the red LED luminescence center wavelength in 620 ~ 630nm. Mainly applicable to the neon lights, taillights, indicator and signal machine, LED display red light source and LCD panel backlight source, red blue and green LED compared with LED LED, driving voltage and temperature characteristics are also different. This is because the semiconductor material is different, the red LED using AlInGaP, while the blue LED and green LED using GaN material. Driving voltage (forward voltage), the red LED is more than 2V, while the blue LED and green LED for more than 3V.

In the aspect of temperature characteristics, the output power of red LED will change greatly because of the temperature, and the output power of high temperature is lower than that of green LED and blue LED. Wide range of applications, the wave looks longer than other colors. Due to the differences in these features, the penetration ability of red LED are stronger than the green, blue, so in the haze red LED is more conducive to the visibility of the poor place to attract people's attention.