Outdoor LED display does not blindly pursue high brightness
For the led display how to achieve energy savings, I believe many people in the circle naturally will not be unfamiliar, its nothing more than from the highlights LED lamp beads, driver IC, switching power supply, structural energy-saving design and other aspects of the implementation. But I do not know when, perhaps in some manufacturers intentionally or unintentionally respected, "high energy" concept is being "high brightness" fuzzy and quietly replaced, the same غير مجاز مي باشدt, the brightness of the display will be higher " "Energy saving", with its superior غير مجاز مي باشدt-performance advantage, seems to be the universal concept of people today.
As we all know, LED as a new type of lighting technology, based on light-emitting diodes, compared with traditional light sources, with low energy consumption, high brightness properties. However, in the field of LED display, is the fact that it is?
Regarding the paradox of “high energy saving”, in fact, in order to achieve a good energy saving goal, excessive pursuit of high brightness is a departure from energy conservation.
It is understood that the led display brightness is proportional to the drive current, with the current domestic 12000cd/m2 high brightness led display, for example, the brightness of 12000cd/m2 is due to increased drive current. However, due to the physical characteristics of the LED light source itself, high-brightness LED displays will inevitably be accompanied by high attenuation and low stability. Moreover, this high attenuation is not only detrimental to the long-term use requirements of the led display screen, but also becomes an inherently excessive defect in the pursuit of high brightness, and these birth defects will also damage the life of the led display screen and the screen effect.
According to the test results of the relevant test institute, the high-brightness P16 full-color table static LED display is used as an example. The test data of this high-brightness led display shows that the brightness of 12000cd/m2 will be seriously attenuated to 8000cd/m2 within 2 years. The attenuation rate is more than 20%. What is more serious is that after the brightness is reduced from 12000cd/m2 to 8000cd/m2, the high operating current does not change, and the brightness decay rate is even faster, resulting in several times faster decay rate and high attenuation. The display. When the device is in this vicious cycle of brightness decay, the LED display simply can not meet the long-term use requirements.
Therefore, the value of over-highlighting on the market is not meant to mean advanced technology in terms of LED display manufacturing technology, but a high current and high brightness that is sacrificed at the expense of display life. On the contrary, it is unavoidable to be spurious and overwhelming. Caused by "light pollution" According to the identification of relevant professional departments, the brightness of sunlight in daily life is generally 2000cd, with the continuous improvement of outdoor led display technology, the current market led outdoor display brightness is mostly 5000cd, or higher, can It is twice the brightness of the sun.
Therefore, if the installation position of the outdoor led display screen is too low, the human cornea and iris may be easily damaged when viewed with the naked eye, and visual fatigue and vision loss may occur, which may even seriously affect the central nervous system of the human brain. Dizzy, want to vomit. In addition, some display screens currently on the market will constantly flicker in order to achieve colorful effects. When the human eye looks directly at such display screens, if the light frequency is too high, it will have an effect on the macula of the human eye's retina and long-term damage. Can cause macular degeneration.
At present, the problem of light pollution in global cities is already very serious. Many countries have even introduced laws and regulations to strictly control outdoor lighting and display brightness. LED screens, as a kind of high brightness in many display technologies, have almost become the overlord of outdoor displays, but once At night, the bright screen will become an invisible form of 'pollution', which will also become a problem that we urgently need to solve in the future.
In addition, high brightness will also cause the overall غير مجاز مي باشدt of the project to rise. Whether the user really needs such a high brightness is also worth discussing, and it is very likely to cause performance waste. In short, the pursuit of high brightness is actually very harmful, consumers in the purchase of led display, according to their own needs, comprehensive consideration of غير مجاز مي باشدt performance and display application requirements, avoid blind pursuit of high brightness.
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