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Teach you to set the brightness of the LED display security parameters
In recent years, with the development of LED display tells, LED display applications more widely, by virtue of the LED display brightness, high refresh rate and other advantages, quickly became a leader in the field of outdoor display, but it is Due to light pollution caused by high brightness LED display, often criticized by the people. In order to avoid light pollution, small specially compiled some security on the LED display brightness parameter setting method and safety precautions.
(1) LED screen brightness according to ambient brightness adjustment
The main purpose is to adjust the brightness according to ambient light intensity, the entire screen to adjust LED brightness, the LED display looks both bright and clear without glare. Most domestic LED display manufacturers have implemented this feature, but really make good use of this technology are not many businesses and consumers, on the one hand, the lack of accurate and easy to use ambient light detection equipment on the market, on the other hand, LED the lack of regulation of the display industry specification for reference.
When the human eye to adapt to the ambient brightness 800 candela per square meter, and can see the brightness range is 80-8000 candela per square meter. Anything beyond this brightness range of the display needs to adapt to the human eye adjustment efforts, and gradually see. For example, in 5000 candela per square meter outdoor ambient brightness for easy viewing of the display device is roughly the brightness range 500-50000 candela per square meter, in this environment, if you want to clearly identify 60 candela per square meter of mobile content, you need efforts to regulate the human eye for a few seconds in order to gradually adapt to, is the truth.
In accordance with this theory, you can build LED display brightness adjustment method design specifications. According to the environmental brightness to make the grayscale range falls within the range of the human eye for comfortable viewing. In particular, the maximum brightness at night, the display should be less than 10 times the ambient brightness.
The relationship between environmental brightness and display brightness between the best output device
Day (subjective feelings) LED display brightness settings optimal curve from early morning to midnight, 24 hours ambient brightness and contrast curve should be. From the test results, the change in the brightness of day outdoor environment is very obvious, sunny day, when the brightness of the brightest and darkest time of the brightness of up to 30,000 to 1 ratio. Corresponding LED display brightness setting change is beyond imagination. When the night is set to 60cd environment LED display LED screen bright enough to feel, but to day at noon, even 5000-6000cd are not bright enough. Close to 100-fold difference between light and dark.
Because there are no standard constraints, many outdoor LED display shows a very dazzling brightness of the night, to the surrounding environment causing serious light pollution to the surrounding residents invisible injury. Recommended the establishment of industry standards as soon as possible, constraints of corporate behavior, forcing businesses to install dimming devices. LED display during use, it should be in accordance with industry standards, according to the environmental changes automatically adjust the brightness of the LED display brightness output level, in a dark environment, the output of high-brightness LED display is prohibited.
(2) specification of the blue display led output
Perception of the human eye to different wavelengths of light is different, due to the human eye perception of brightness is based on the characteristics of the parameters, only not accurately reflect the intensity of light with brightness. With the amount of radiation energy as a visible security measure, more accurately reflect the effect of light on the eye of the dose. Should be used to measure the value of irradiance measurement equipment, rather than feeling blue eyes brightness light output intensity as the interpretation of the blue light will it harm the eyes basis. LED display manufacturers and users should be displayed under the condition, reducing the output component of the blue LED display.
(3) specification LED display light distribution and direction
Should try to consider the LED light distribution is reasonable, in the visible range of angles so that the light output of the LED energy evenly distributed in all directions to avoid the small viewing angle LED light direct to the human eye. At the same time, it should be limited to LED light irradiation direction and scope, reducing the LED display on the surrounding environment pollution.
(4) specification display output frequency
LED display manufacturers should be strictly in accordance with the requirements of the design specification of LED display screen, the display screen output frequency to meet regulatory requirements, to avoid the flicker to the viewer a sense of discomfort.
(5) expressly security measures in the LED display manual
LED display user's manual should indicate the use precautions, instructions on proper way to adjust the brightness of the LED display, LED display and jeopardize long look into the human eye may cause. When the automatic brightness adjustment equipment failure, should be taken to manually adjust the way or off the LED display.
When confronted with the glare LED display in the dark, the self-protection measures should be, do not look directly at the LED display for a long time or the details carefully to identify the LED display on the screen, try to avoid LED after the formation of the eye focuses light in the eyes spots, burns the retina.
(6) LED display design and production process safeguards
Design, production staff will contact more frequently than the user LED display. In the design, the production process requires test LED overload operation. Therefore, the design, production personnel with LED light easily exposed, they should pay attention and take special LED display design, protective measures of the production process.
LED high brightness outdoor LED display rental production and testing process, relevant staff should wear light attenuation of black sunglasses 4-8 times before they can watch the LED display details. Indoor LED display production and testing process, relevant staff are required to wear light attenuation 2-4 times the black sunglasses.
Especially in a dark environment for staff to test the LED display, but also to pay attention to security, must wear black sunglasses before you can look directly at the LED display.
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