The blue light hazard of the hottest LED display c

2022-08-02
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The "blue light hazard" in the control room of LED display screen is irreversible to human eyes

the vast majority of people do not know that the long-term viewing of short wave blue light will harm the eyes, which is prone to eye diseases such as vision loss, dry eyes, tears and even cataracts. It is very important to correctly understand the "blue light hazard" in various products and technologies for human eye health

"blue light hazard" is a chronic process, but it is irreversible

blue light is everywhere in life, but not all blue light will cause eye health hazards. Among them, high-energy short wave blue light with a wavelength between 400 nm and 500 nm will have the potential to cause damage to the visual film. In the 2010 annual meeting of the international optical association, the world's top optical experts also unanimously pointed out that short wave blue light has very high energy and can penetrate the lens directly to the optic membrane

wavelength range of short wave blue light

"blue light hazard" is a chronic process that is not easy to detect. Many people only feel dry eyes and various discomfort, but this damage to the macular area at the end of the eyeball is enough to affect a person's life. It should also be noted that the damage of high-frequency blue light to the eyes is irreversible

different technical principles lead to different "blue light hazards" for different large screens.

as users in the control room need to watch large screens for a long time, "blue light hazards" is a topic that cannot be bypassed. It is more necessary to evaluate the impact of various large screen display technologies on human eye health from the source of product selection. Different technical principles, All kinds of large screen display products have angle displacement protection on both sides (the degree of avoiding changing the angle beyond the design technology is also very different.

as the mainstream display product in the control room all the time, D plus a small amount of watch oil LP has a leading edge in terms of display effect and visual comfort, and its "blue light hazard" Also the smallest. This is because DLP is output from the LED light source to the screen display, and through multiple projection, reflection and transmission processes such as light rod, optical micro mirror DMD, mirror and optical screen, it can effectively filter the high-energy short wave blue light, and the light output to the human eye is the softest without damaging the eyes. After more than ten years of accumulation and precipitation, the international influence of China's plastic machinery industry has been continuously improved. The practical application of DLP in the control room market has also proved this

dlp imaging principle schematic diagram

around 2012, SMD small spacing LEDs began to enter the indoor application market in succession. As a "latecomer", SMD small spacing led certainly has many advantages in indoor applications, but its "long-time, close-up viewing discomfort" has always been one of the main problems perplexing the industry and user applications. The white light in the LED display screen is mixed by the blue LED chip, the red LED chip and the green LED chip. There is a strong blue band in the spectral energy, and the blue energy is relatively high. In addition, the light-emitting area of LED chip in SMD packaging technology is very small, and the beam is relatively concentrated, so its brightness is quite high, and the blue light damage is also the largest. Long term blue light stimulation of SMD small spacing led directly to human eyes can easily cause optic membrane lesions

smd small spacing LED surface emits light, and the short wave blue light will be directed to the human eye.

when it comes to the "blue light hazard" of LCD display products, from a technical point of view, it is similar to ordinary TV, and other daily electronic terminal products. LCD unscrewing the oil supply valve to raise the piston display screen is mostly composed of white LED backlight, and most of its white light is realized by mixing blue LED with yellow phosphor. The LED backlight of LCD screen has been attenuated by liquid crystal layer, colorfilter and glass panel, and its degree of "blue light hazard" is between DLP and SMD small spacing LEDs

schematic diagram of LCD imaging principle

in addition, the degree of "blue light hazard" is also closely related to the selection of brightness and color temperature. The higher the brightness and color temperature, the greater the damage of blue light received by human eyes

to sum up, DLP has moderate brightness, soft color, and the lowest "blue light hazard", which can effectively ensure the comfort and health of human eyes. It is the most ideal control room display product

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