Does the OLED display protect the eyes or hurt the eyes?

OLED reduces blue light damage compared to ordinary LEDs. Short-term viewing has little impact on vision, but long-term viewing will still cause damage to the eyes. damage.

Before talking about eye protection, we should first talk about why display devices can hurt eyes. The blue light emitted by the screens we come into contact with every day can be said to be one of the culprits causing eye fatigue and poor vision. There is relatively reliable data support for the harm of blue light at home and abroad. Previously, the Visual Health Laboratory of the China Institute of Standardization conducted a study on the impact of LED blue light on human visual fatigue. The results of nearly 600 human visual physiological experiments showed that the visual performance of subjects who shielded 15% of blue light was better than that of subjects who did not shield blue light. Fatigue is reduced by nearly 21%.

Where does screen blue light come from?

The luminous principle of LCD TV is similar to that of the sun

Take the current mainstream LCD TV as an example. Its luminous principle is very similar to that of sunlight. Sunlight is Our naked eye senses white light. By decomposing sunlight through a prism, we can see that white light is composed of red light, green light, and blue light. In a general sense, the principle of liquid crystal luminescence that we understand is that the white light emitted by LEDs shines on the liquid crystal. On the module, the three primary colors of RGB are dispersed, thus showing a variety of colors. These seem to have nothing to do with the harmful blue light we are talking about, but everyone does not know that harmful blue light comes from LED lamp beads.

The white backlight generated by the LED lamp bead is not itself white

The white backlight generated by the LED lamp bead is not itself white. Instead, white fluorescence is excited by high-energy blue light. Current LED lamp beads use blue light to hit phosphor to produce yellow light. After the yellow light is excited by the blue light, they are emitted from the LED together, so we will see white light. In fact, this is just a mixture of blue and yellow. It’s just composite light that comes together, and that’s where harmful blue light comes from.

What exactly is blue light hazard?

We all know that light in nature is composed of various color spectrums. However, different wavelengths present different colors visually. For example, the light with a wavelength of 600 to 700 nanometers, what we see It is red light, light between 500 and 600 nanometers, what we see is yellow light, and blue light has a wavelength between 400 and 500 nanometers.

Blue light wavelength is relatively short

Physical research shows that the shorter the wavelength, the higher the energy, and the stronger its penetrating power. The wavelength of blue light is relatively short, so people are very concerned about the harm of blue light to human eyes. We are currently moving towards the era of "everything is displayed", and screens are inseparable from everywhere in our lives. TVs, mobile phones, tablets, etc. have become electronic products that we must use every day. For these screens that use LED as the light source, the peak spectrum of the light source is this short-wave blue light. The longer the screen is viewed, the greater the damage to the human eye.

In contrast, the OLED technology that is gradually maturing now has broken away from the LED backlight mode. Each of its pixels can emit light on its own. As long as a voltage is input to the electrode, the excitation layer can produce the required colored light. The organic luminescent materials used greatly reduce the intensity of the blue light spectrum. The wavelength of blue light produced by LCD TVs currently on the market is mostly around 450 nanometers, while the wavelength of blue light produced by OLED TVs is between 460-480 nanometers. According to the physical principle of "the shorter the wavelength, the higher the energy", OLED TVs and LCD TVs TVs produce less energy than blue light, so they are less harmful to human eyes.

In November 2016, the national testing agency Terrat conducted a blue light test report on a certain brand of OLED TV. The report showed that the blue light hazardous radiance value of this OLED TV was only 0.1441Wm- 2sr-1. Terate engineers said that in addition to blue light detection on OLED TVs, they also conducted comparative analysis with LCD TVs, LCD monitors and mobile phones through Terate big data. Big data analysis shows that the average radiance of LCD TVs is 0.6339Wm-2sr-1. In other words, the blue light radiation of OLED TVs is 77% lower than the average value of LCD TVs, and 83% lower than the highest value of LCD TVs.

So, judging from objective data, OLED TVs are indeed less damaging to the eyes than LCD TVs. Short-term viewing has little impact on vision.

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