Analysis of light pollution of outdoor LED display

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With the rapid development of the electronic industry, LED displays have been widely used in various fields, and the "light pollution" produced by outdoor LED displays has also been pushed to the forefront. So what is light pollution, what impact will it have on human body, and what measures should we take to prevent or reduce light pollution? Next, the well-known LED display manufacturer Kress optoelectronics will give you a detailed answer

solution to the light pollution problem of LED display screen

the high brightness characteristic of LED display screen is an important reason for light pollution. In order to effectively solve the light pollution problem, the following safety protection methods can be adopted

first, adjust the brightness relying on the environment

1. Adjust the brightness of human eyes

adjust the overall brightness of the LED display screen according to the intensity of the ambient light in which the display screen is located, so as to ensure the clarity of the display screen and avoid harsh and eye-catching adverse visual feelings. The investigation shows that if the human eye is used to the ambient brightness of 800cd/m2, the brightness that the human eye can see is 80~8 000cd/m2. If it exceeds this brightness scale, the human eye must be conditioned for several seconds to gradually see. Therefore, the LED display screen should rely on the environment to adjust the brightness, and the environmental brightness monitoring equipment should be introduced to provide a reliable basis for brightness adjustment, so that the brightness of the display screen can be adjusted to the range of comfortable viewing for human eyes. During the night, the brightness of the display screen should be controlled below 10 times of the ambient brightness

2. Introduce brightness adjustment standards

the brightness of many outdoor displays is too high at night, causing serious light pollution and affecting the lives of surrounding residents to a certain extent. Therefore, the relevant departments should issue the brightness adjustment standards of the display screen, strengthen the prevention and control of light pollution, require the display screen users to actively adjust the brightness output according to the ambient brightness, and strictly prohibit the output of high brightness and strong light in the paint night this year

second, reducing the output of blue light

light of different wavelengths will bring different visual perception to the human eye. Due to the complexity of human eye perception, it is difficult to reflect the human eye's perception of light through the measurement standard of brightness, so the irradiation index can be introduced as the standard to judge the safe energy range of visible light. When measuring the effect of light on the human eye, we should not only rely on the brightness perception of blue light by the human eye, but also introduce irradiance measurement equipment, and use the data measured by the measurement equipment to objectively reflect the impact of blue light output intensity on visual perception. On the basis of ensuring the display function of the LED display screen, the manufacturer should appropriately reduce the output of blue light, so as to avoid discomfort to human eyes

III. control the light distribution

reasonably arrange the light of LED display screen, and evenly distribute the light energy output by the display screen within the visible scale of human eyes, so as to avoid local strong light problems of the display screen. This requires that when producing LED display screens, the direction and scale of light exposure must be strictly limited in order to effectively control the light pollution of LED display screens

IV. express the protection method of safety monomer purity ≥ 99.9%

facing the new needs of the industry, 4. Understand the measurement standard operation manual of LED display products, indicate the safety protection precautions, focus on the correct method of brightness adjustment of LED display, and clarify the possible harm caused by long-term direct viewing of human eyes. In case of operation failure of the automatic brightness adjustment system of the display screen, the brightness can be adjusted manually. At the same time, we should popularize the safety protection measures of light pollution to the public, and enhance the self-protection ability of the public. For example, you can't look directly at the display screen for a long time. Try to avoid the human eye focusing on the detailed picture on the display screen, and avoid visual bright spots caused by LED gathering in the fundus of the eyes, and even burn the visual film in serious cases

v. improve product performance and quality

in order to ensure the performance of LED display products, we should strengthen the brightness detection of products in indoor and outdoor environments. In the process of indoor detection, the staff should wear black sunglasses with brightness attenuation of 2-4 times, and observe the details of the display screen in a close range to see if there are problems. In the process of outdoor detection, the staff should wear black sunglasses with brightness attenuation of 4~8 times. Especially in the dark environment, the staff must wear safety protection tools to prevent the staff from being exposed to strong light

VI. introduction of advanced technology

led display screen has obvious differences in brightness changes in different time periods and different places. Once the brightness output of the display screen exceeds 60% of the ambient brightness, it will bring discomfort to human eyes and produce light pollution. Therefore, the LED display screen should be equipped with an outdoor brightness acquisition system to collect the ambient brightness in real time, and transmit the ambient brightness information to the central control room, which will automatically calculate the most appropriate display output brightness according to the received data information, and take this as the basis for brightness adjustment

in addition, multi-level gray correction technology should be introduced into the LED display screen to improve the color transition of ordinary 8bit color display screen, so as to avoid causing strong discomfort to human eyes. With the support of multi-level gray correction technology, the color display level of the original display system can be increased to 14bit, which brings a soft color transition to the human eye and reduces the stimulation of light to the human eye

led display screen, as a kind of light source, will inevitably have light safety and light pollution problems in the process of operation. In order to effectively prevent the harm caused by LED display screen to human body, we should take reasonable and feasible measures to eliminate the light pollution of LED display screen on the basis of a comprehensive analysis of its light safety problems, which can not only provide protection for human health, but also help to expand the application scope of LED display screen

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