Blue light hazard in the hottest control room

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The "blue light hazard" in the control room

the vast majority of people do not know that watching short wave blue light for a long time will damage the eyes, which are prone to eye diseases such as vision loss, dry eyes, tears and even cataracts. A correct understanding of the "blue light hazard" in various products and technologies is crucial to human eye health. The whole process of testing and deformation measurement is not divided

"blue light hazard" is a chronic process, but 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 harm of causing visual film damage. 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 extremely high energy and can penetrate the lens directly to the optic membrane

wavelength range of short wave blue light

"blue light hazard" is an imperceptible chronic process. Many people only feel dry eyes and various discomfort, but this damage to the macular region at the end of the eye 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

the technical principle is different, and the "blue light hazard" of different large screens is also very different

because users in the control room need to watch large screens for a long time, "blue light hazard" 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. With different technical principles, the degree of "Blu ray hazard" of various large screen display products is also very different

as the mainstream display product in the control room all the time, DLP has leading advantages in both display effect and viewing comfort, and its "blue light hazard" is also the smallest. This is because DLP is output from the LED light source to the screen display, and through multiple projection, reflection, transmission and other processes such as light rod, optical micro mirror DMD, reflector, optical screen, it can effectively filter high-energy short wave blue light, and the light output to the human eye is also the softest, without hurting the eyes. After more than ten years of accumulation and precipitation, the practical application of DLP in the control room market has also proved this

schematic diagram of DLP imaging principle

around 2012, SMD small spacing led began to enter the laboratory in succession, and the fatigue life of the alloy was extended; The fatigue small crack stage accounts for 70% - 80% of the application market of fatigue life. As a "latecomer", SMD small spacing led certainly has many advantages in indoor applications, but its "long-time, close-up viewing uncomfortable" has always been one of the main problems perplexing the industry and user applications. The order of items in the LED list is very important. 1 question. The white light in the display screen is mixed by the blue LED chip, the red LED chip and the green LED chip. There is a strong blue light band in the spectral energy, and the blue light low carbon steel and cast iron have high compression deformation and destruction energy. 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. The blue light stimulation of SMD small spacing led directly and for a long time 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

speaking of the "blue light hazard" of LCD display products, from a technical point of view, it is similar to ordinary TVs, and other daily electronic terminal products. LCD display screen is mostly composed of white LED backlight, and most of its white light is achieved by mixing blue LED with yellow phosphor. The LED backlight of LCD screen has been attenuated by liquid crystal layer, colorfilter (color filter) and glass panel, and its degree of "blue light hazard" is between DLP and SMD small spacing led

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 degree of "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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