Control room "blue light hazard"
Most people do not know that short-wave blue light will damage the eyes for a long time, and it is prone to eye diseases such as decreased vision, dry eyes, tears and even cataracts. Correct recognition of the "blue light hazard" in various products and technologies is essential for human eye health.
"Blue light hazard" is a chronic process, but irreversible.
Blu-ray is ubiquitous in life, but not all blue light can cause eye health hazards. High-energy short-wave blue light with wavelengths between 400 nm and 500 nm can cause potential damage to retinal damage. At the 2010 International Light Association Annual Meeting, the world's top optical experts also unanimously pointed out that short-wave blue light has extremely high energy and can penetrate the lens to reach the retina.
Short-wave blue wavelength range
"Blue light hazard" is a chronic process that is not easy to detect. Many people only feel dry eyes and various discomforts, but this kind of damage to the macular area at the end of the eye is enough to affect a person's life. It is also important to note that high-frequency blue light is irreversible for eye damage.
The technical principle is different, and the "blue light hazard" of different large screens is also very different.
Because the control room users need to watch the big screen for a long time, "blue light hazard" is a topic that can't be bypassed. More needs to start from the source of product selection, to assess the impact of various large-screen display technology on human eye health. The technical principle is different, and the degree of various large-screen display products in the "blue light hazard" is also very different.
As the mainstream display product of the control room, DLP has a leading edge in both display 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 the process of multiple projection, reflection, transmission, etc. of the light bar, optical micromirror DMD, mirror, optical screen, etc. can effectively filter high-energy short-wave blue light and display output to people. The light in the eyes is also the softest and does not hurt 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 point.
DLP imaging principle
Around 2012, SMD small-pitch LEDs began to enter the indoor application market. As a "latecomer", SMD small-pitch LEDs have many advantages in indoor applications, but their "long-term, close-distance viewing is uncomfortable" has been one of the major problems that plague the industry and user applications. The white light in the LED display is formed by mixing the blue LED chip with the red LED chip and the green LED chip. The spectral energy has a strong blue light band and the blue light energy is relatively high. In addition, in the SMD package technology, the LED chip has a very small light-emitting area, and the light beam is relatively concentrated, so the brightness thereof is relatively high, and the blue light damage is also the largest. The human eye directly receives long-term blue light stimulation of SMD small-pitch LEDs, which can easily cause retinopathy.
SMD small-pitch LED surface emits light, short-wave blue light will directly hit the human eye
When it comes to the "blue light hazard" of LCD display products, it is similar to ordinary electronic terminal products such as ordinary TVs and mobile phones. LCD displays are mostly composed of white LED backlights, and most of their white light is achieved by mixing blue phosphors with blue LEDs. The LED backlight of the LCD display is attenuated by the liquid crystal layer, ColorFilter (color filter) and glass panel, and its degree of "blue light hazard" is between DLP and SMD small pitch LED.
Schematic diagram of LCD imaging principle
In addition, the degree of "blue light hazard" is also closely related to the choice of brightness and color temperature. The higher the brightness and the higher the color temperature, the greater the damage to the blue light accepted by the human eye.
In summary, DLP has moderate brightness and soft color, and its "blue light hazard" is the lowest level, which can effectively ensure the comfort and health of human eyes. It is the ideal control room display product.
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