This wave of eye protection technology on TV is very strong

PConline talks about the development of TVs and various types of display devices. From sharpness to sharpness, to the ever-changing colors, today have reached a higher level. The continuous improvement of the display level has brought us closer to the world. When VR and AR are also commercialized, it seems that science-fiction life is just around the corner. But aside from the pleasure brought by these technologies, have you ever thought about letting you capture the feelings of light and shadow?

Does the ubiquitous screen "brighten" you?

Everyone in white-collar workers looks back at the work day. Your eyes are looking at something: getting up in the morning holding a cell phone, brushing a circle of friends, brushing news on the way to work, and keeping the company staring at the computer until work, returning home to watch a TV at night. Before going to bed, brush a wave of friends. Of course not everyone is like this, but most office workers rely on the screen very seriously.

Although I didn't wear glasses, Xiao Bian had obviously felt that the eyes were often dry and itchy, and my eyesight was slightly reduced. The culprit is of course these "screens." To put it more precisely, the large amount of blue light generated by the LEDs in these "screens" has caused tremendous damage to the eyes. Of course, some of the damage is due to the phone playing too excited and forgetting to sleep.

For users who have been exposed to the screen for a long time, avoiding Blu-ray damage has become the primary measure to protect the eyes. So iOS launched the Night Shift anti-Blu-ray mode, as well as a variety of Blu-ray mobile phone film, Blu-ray mobile phone APP, PC There are also high-end and professional anti-blue eyes.

TV is also a display device that people often come into contact with in everyday life. Many girls like to play TV on TV, boys like to play PS games on TV, etc. How should TV be effective against Blu-ray? Probably divided into three directions, adjust the backlight, debug color temperature, replace the luminescent material.

How to understand these methods of filtering blue light, first come up with a small science, learn about Blu-ray this thing. Most of the various display devices that we usually use are LED-based, and now LED bulbs are also very popular. White LEDs need to be turned white by blue LED+phosphor. The more color temperature the blue LED emits, the higher the color temperature will be, and the brighter it is. Therefore, some display devices need to save power by “looking bright”. And the cost, cold light LED has become the best choice.

LED white light formation

Why does blue light look bright and dazzling? Because its spectrum is concentrated in the 400-480 nanometer range, the wavelength is short in the high frequency band, the energy is high, the penetrating ability is strong, we know that the ultraviolet wavelength is lower than 400 nanometers. In the LED white light spectrum, there is a protruding energy peak near 400 nm. The blue light of middle and low frequencies can penetrate the crystal to reach the retina, and the high-frequency blue light can reach the cornea more directly. So long time staring at the screen will appear fatigue, dryness, tingling and other symptoms, is a signal of eye self-protection.

Blue spectrum

A cell on our retina is very sensitive to blue light. If it comes in contact with a large amount of blue light, it will be like the daytime signal from the brain (the solar spectrum also has a lot of blue light). Therefore, it is very difficult to fall asleep when taking a mobile phone brush for a long time. In addition, blue light also inhibits the secretion of melatonin, which affects the quality of sleep. Therefore, lack of sleep, eye fatigue will also increase, but also produces a large number of various problems, which is equivalent to the indirect effects of blue light.

There are also reports of blue light damage, such as macular lesions, accelerated retinal cell apoptosis, etc. Most of them have not undergone rigorous experiments and do not have strict scientific basis. There are too many factors to influence and it is not enough to blame all of Blu-ray's responsibility. For example, the cause of macular lesions may be aging; photochemical reactions that accelerate retinal apoptosis are reversible and repairable.

Although there is no clear experiment to prove how much blue light hurts the glasses, but from the actual experience, Xiao Bian's monitor has been using the eye protection mode (anti-Blu-ray mode), although the color deviation is obvious, but the eyes are really comfortable It's not as dazzling as before. Of course, there is no tool to prevent myopia, or to pay attention to eye health, regular look into the distance, reduce eye fatigue.

OLED & Laser TV More Healthy Ways to Watch

In addition to ordinary phosphors to change the peak intensity of blue light and adjust the color temperature on TV, the mature OLED technology, due to its own rid of the LED backlight mode, uses organic light-emitting materials to greatly reduce the intensity of the blue light spectrum. . The PConline evaluation room also conducted related experiments to compare the difference between the OLED display device and the LCD (LED backlight) display device in releasing the blue light.

The basic structure of OLED display technology

By using a special filter for shooting, it can shield most of the light with weak penetration, such as red and yellow light. The more penetrating light will be captured by the camera, such as blue and purple. The camera shot through this filter shows more blue-violet light, indicating that the more blue light the TV emits.

OLED TV

LCD TV (LED backlight)

This is a blue-green peacock opening screen, which can clearly see the apparently dazzling blue light projected on ordinary LCD TVs. OLED TVs are much softer.

At present, OLED display devices have better basic conditions than LCD devices in terms of light control, dynamics, and color, but the price is still higher. If children in the family often watch TV, it is necessary to replace the TV with an OLED device for the child's eyes.

Of course, in addition to OLED devices, there are also laser televisions that have good eye protection capabilities. Instead of directly eliminating blue light, it uses diffuse reflection to achieve a soft and comfortable viewing experience.

From the imaging principle, laser light is emitted from a blue laser light source, three color lights are projected on a DMD chip after passing through a color wheel, and then is projected onto a mirror through an optical machine and an ultra-short focal lens, and finally is irradiated on a screen by a reflector. After being reflected by the screen, a complete image is formed. Finally, the eyeball enters the human eye. The human eye always sees reflected light and does not need to directly face the laser light source. The harmful light source further reduces the damage to the glasses.

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Laser TV imaging principle

The laser TV is also equipped with a Fresnel passive bionic screen, the screen itself does not emit light, can reduce the stroboscopic, shield the ambient light, and the laser light source is imaged on the Fresnel bionic screen several times through transmission and refraction, bringing closer to the real The world's light and shadow feels more comfortable than watching the screen for a long time.

At present, the impact of Blu-ray on people is not particularly large, but because LED screens have been around for a long time and people have not seen the long-term impact, we still cannot take it lightly. Although the blue light emitted by the sun is much higher than the display device, how many people really look at the sun? The eyes are basically reflected light, just like laser televisions and projection equipment. The LCD screen is solid and straight toward you. All the light hits your eyes. Of course, there will be great stimulation.

Modern life is filled with too many "screens" to keep the eyes from getting a good rest. Blu-ray prevention also becomes a remedy. However, it also has some shortcomings, which will have a greater impact on the picture quality of the display device.

People who stay in front of the computer for a long time will still often use eye fatigue. The eye protection mode will at least make you relatively comfortable. It's best to use anti-blue light for work or entertainment at night, at least to keep you from getting too excited before going to bed. If your design worker has very strict requirements on the screen display color, there is no way.

However, the more important thing is often the period we selectively ignore. It is the reasonable rest of the eyes and the regular gaze. At night, we have to play less and sleep a little more.

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