Three hidden dangers behind ED display

With the continuous development of human needs, the installation of LED display screens in public communities has become a beautiful landscape on the street. It not only meets the needs of the masses to wait for the bus, but also beautifies the appearance of the city. However, when the LED display screen of the bus stop is springing up, the resulting brightness is too high, frequent flashing, glare and other problems have been criticized by some citizens. The brightness is too dazzling. Every night, the lights are on, and the LED screen advertisements on the bus stops along Wuhan Avenue are particularly noticeable. As the lights jump, various patterns appear from time to time. 'The screen is too dazzling, shaking my tears. Mr. Fang, who is waiting at Xudong Village station on Xudong Street, said that due to the glare of the dark light, passengers will choose to lower their heads or turn to the other side when waiting for the bus. 'The screen is facing the cab, and when it suddenly turns white, the eyes are very uncomfortable. 'For the bus stop LED advertising screen, a bus driver is also very dissatisfied. Li Shifu, a taxi driver with many years of driving experience, said that especially in the evening, he wanted to see if there was anyone on the platform to take a taxi. The advertising screen flashed and his eyes were involuntarily attracted. Affecting health and endangering safety 'human eyes are sensitive to high-brightness colored light. 'Zeng Qingyan, deputy dean of Wuhan Aier Eye Hospital and director of the Department of corneal diseases, said that short-term color jumps are prone to visual blind spots. She said that the LED screen has a large color difference with the surrounding environment when it is dark, and yellow, red and other colored lights will make the eyes uncomfortable. Unlike the large-scale advertising LED screen with hundreds of square meters in the business district, the electronic screen of the bus stop is closer to the person and causes more harm to the human eye. Chen Xiao, deputy director of the ophthalmology department of the Wuhan General Hospital of the Guangzhou Military Region, said that the electronic screen continued to flash at close range to drivers and pedestrians, and the pupil could not contract, which would cause loss of retinal photoreceptor cells and induce or aggravate cataract. If you encounter high-brightness white light stimulation, you will even be blinded for a short time, causing traffic accidents. Mao Chaojun, engineer of Wuhan jinhuasheng Technology Co. , Ltd. , has conducted field measurements on many outdoor LED displays in the central city. In order to obtain better display effect, the brightness of LED displays needs to reach 4000cd/m2 ( Candela/square meter, refers to the luminous brightness per unit area). Mao Chaojun said that according to the 'Wuhan outdoor advertising signboard setting Technical specifications', the outdoor advertising area is 0. 5- Between 2 m², the large allowable brightness should not exceed 800cd/m2. According to this standard, these screens are greatly exceeded. The brightness regulation is still blank for the design of bus stops, the person in charge of the Wuhan public transport management office recently said that the construction of bus stops is not invested by the government, but completely market-oriented, investment, construction, operation and maintenance by advertising companies. At present, the stop advertising is operated by nearly 10 companies. 'Customer requirements are too harsh. Mao Chaojun said that in order to attract attention, advertisers often require advertisements to 'flash, light, and jump' when they play, and the LED screen will become brighter and brighter. At present, light pollution is generally divided into three categories in the world, namely white light pollution, artificial white light and color light pollution. The installation and setting of the LED display screen and the playing content are all approved and supervised by the relevant departments, but there is no uniform standard for brightness. The relevant person in charge of the Wuhan Urban Management Bureau also said that the current brightness standard of the Wuhan LED display is indeed blank. The 'Wuhan outdoor advertising signboard setting Technical Specification' issued in 2005 only stipulates the lighting brightness of traditional outdoor advertising and signboards, and does not apply to LED electronic display screens. It is understood that due to the disturbing phenomenon of outdoor large-size LED display screens, Wuhan City has temporarily suspended the construction of such displays since last June, but there is no restriction on the LED screens of bus stops. An advertising industry official said that the city needs to be embellished, LED display, neon lights, etc. are a manifestation of urban modernization. The government can revise the special plan to re-demand the LED brightness, the flashing frequency, and the color difference, and guide the healthy development of outdoor advertising.