How to avoid light pollution? From the LED display security brightness parameter settings

With the application of LED display in the outdoor field more and more mature, LED display has become the major cities of the main road, the city of the standard, but its high brightness caused by light pollution, often criticized by people. How to ensure the needs of the city at the same time as far as possible to reduce the problem of LED light pollution? Can be displayed from the LED security settings and the brightness of the security measures to protect people.

(1) adjust the brightness of the LED screen according to the ambient brightness

The main purpose of brightness adjustment is to adjust the brightness of the LED screen according to the ambient light intensity, so that the LED display is both clear and bright without glare. Most of the domestic LED display manufacturers have realized this function, but the real use of this technology enterprises and users is not much, on the one hand, the lack of environmental brightness detecting device accurate and easy to use on the market, on the other hand, LED display industry lack of adjustment specification for reference.

When the human eye to adapt to 800 Candela per square meter of ambient brightness, can see the brightness range is 80-8000 Candela per square meter. Any display beyond this range of brightness needs to be adjusted to adapt to the human eye, and gradually see. For example, in the brightness of the outdoor environment of 5000 candelas per square meter, to watch the display brightness of the equipment is roughly 500-50000 candelas per square meter, in this environment to clearly identify 60 candelas per square meter of the mobile phone, you need to adjust the number of seconds to the human eye to gradually adapt to, is the truth.

According to this theory, we can establish the design method of LED display brightness adjustment method. According to the brightness of the environment, the gray range falls within the range of the human eye. Especially at night, the maximum brightness of the display should be less than 10 times the ambient brightness.

The relationship between the ambient brightness and the optimal output brightness of display devices

According to the day from morning to midnight, 24 hours of environmental brightness curve and the corresponding (subjective) LED screen brightness setting curve, can be seen from the test results, the outdoor environmental brightness in a day is very clear, sunny day, the brightness of light and dark brightness than most up to 30000 than 1. The corresponding LED display brightness settings change beyond imagination. Night environment when the LED screen is set to 60cd on the feeling that the LED screen is bright enough, but by noon, even if the 5000-6000cd is not bright enough. Bright dark difference of nearly 100 times.

Because there is no standard constraints, many outdoor LED display night glare is very dazzling, causing serious pollution to the surrounding environment, to bring invisible damage to the surrounding residents. It is recommended to establish industry standards as soon as possible, to restrain the behavior of enterprises, and to force enterprises to install the brightness adjustment device. LED display in the use of the process, should be in accordance with industry standards, according to the changes in the brightness of the environment to automatically adjust the brightness of the LED display output level, in the dark environment prohibit the LED display output high brightness.

(2) regulate the blue output of the LED display

The ability of the human eye to different wavelengths of light is different, because the brightness is based on the parameters of human eye perception, only the brightness can not accurately reflect the intensity of light. The dose of radiation as a measure of the safety of visible light, can accurately reflect the dose of light on the eye. The measurement value of the device should be measured by the irradiance, rather than the brightness of the eye to the blue light, as a basis for the interpretation of whether the output intensity of the blue light is harmful to the eyes. LED display manufacturers and users should be able to meet the requirements of the display, reduce the blue light output component of the LED display.

(3) regulate the illumination distribution and direction of LED display screen

Should try to consider the rationality of the distribution of light in the LED, the visual angle of the LED output of light energy in the direction of the uniform distribution, to avoid a small angle LED glare directly to the eyes. At the same time, it should limit the direction and scope of LED light irradiation to reduce the pollution of the LED display on the surrounding environment.

(4) regulate the output frequency of the display screen

LED display manufacturers should be strictly in accordance with the requirements of the LED display screen design, display screen output frequency to meet the requirements of the specification, to avoid the screen flicker to the viewer to bring discomfort.

(5) express safety measures in the LED display manual

In the LED display user manual should be noted that the use of note that the correct way to adjust the brightness of the LED display, as well as a long time staring at the LED screen may cause harm to the human eye. When the brightness of the automatic control equipment failure, should take manual adjustment or close the LED display.

When in the dark environment encountered LED screen glare, self protective measures should be open, not a long time LED display or LED display on the screen carefully identify the details, try to avoid LED by eyes focused on fundus retinal burns formed bright spot.

(6) protective measures for the design and production of LED display screen

Design, production personnel will be more frequent contact with the LED display screen than the user. In the process of design and production, we need to test the overload state of LED. Therefore, the design, production personnel with exposure to the LED light, should pay attention to and take special LED display design, production process protection measures.

LED in the outdoor high brightness LED display production and testing process, the relevant staff should wear a black 4-8 brightness attenuation of black glasses, you can close to watch the details of the LED display. In the indoor LED display