Views: 0 Author: Site Editor Publish Time: 2023-05-04 Origin: Site
Global electronic paper leader E Ink Yuantai Technology announced yesterday (14th) a peer-review study on the impact of display screens on human retinal cells. The Harvard School of Public Health compared the adverse effects of display screens and blue light on eye health, and found that brighter, bluer, or colder light can cause higher pressure on retinal cells. The electronic paper device without front light will not emit any blue light to stimulate retinal cells, demonstrating the benefits of E Ink's electronic paper for eye health.
According to Nielsen's data, the average adult spends about 13 hours in front of the screen every day. When the eyes are exposed to high-energy blue light in general LCD or LED screens for several hours, the blue light will harm the retinal cells of the eyes. Exposure to blue light before sleep will reduce the value of sleep melatonin, disrupt the circadian rhythm and recovery sleep.
The main findings of Harvard research include:
The spectrum of backlight and front light on the display is the main cause of retinal cell pressure.
Retinal cells under blue light pressure produce "reactive oxidative species" (ROS), which accumulate over long periods of time, leading to photooxidative retinal damage.
Equipped with E Ink Comfort Gauge ™ The electronic paper device of the front light has three times lower pressure on retinal cells than the LCD device.
Color temperature can affect the pressure value of retinal cells, and even if the LCD color is adjusted to day or night mode, its effect is not as good as using spectral lighting solutions specifically designed to protect eye safety. The electronic paper device without front light will not emit any blue light to stimulate retinal cells.
Dr. Rick Rogers, Chief Research Scientist at the Biomedical Imaging Laboratory at Harvard University School of Public Health, said, "The current blue light safety recommendations for displays are based on the spectrum of light emitted by displays. This study aims to measure the actual response of retinal cells when exposed to commercially available displays." Dr. Rick Rogers is currently the research director of the Massachusetts Institute of Biological Innovation in the United States.
In the current digital age, it is often difficult for people to reduce the time spent using electronic screens, but not all displays are the same, "said Li Zhenghao, Chairman of E Ink Yuantai Technology, parents are increasingly concerned about the time their children spend using 3C displays in school or leisure, but if they can switch some of the time they spend watching the display screen to a healthy electronic paper display suitable for reading and writing, they can still maintain a connection with the digital world without sacrificing their eye health.
Harvard School of Public Health compared liquid crystal displays (LCDs) with electronic paper displays with front light for this study. The main difference between LCD and electronic paper lies in their different ways of emitting light and imaging. In order to view images on an LCD screen, the display screen usually requires LED backlight for imaging, while E Ink's electronic paper display screen, like paper, does not emit light, but reflects environmental light to illuminate the electronic paper screen, allowing the eyes to see the image. When the environmental light is insufficient, the front light can act like a reading light.
In this study, researchers tested electronic paper devices using different types of front lights, including cold white and warm amber LED front lights, as well as the new E Ink Comfort Gauge front light. The design intention of the Comfort Gaze front light is to reduce the amount of blue light reflected on the display screen surface. It has a lower blue light spectral output and less amber light output, providing higher comfort during reading.
Research has found significant differences in the "color temperature" used by LEDs, with the "cold" daylight mode appearing blue white and the "warm" night light mode appearing amber. The exception is E Ink Comfort Gaze, which can reduce harmful blue light output without producing an amber white tone in night light mode. To achieve the same ROS pressure level as the retina caused by the LCD device, the electronic paper device equipped with E Ink Comfort Gauge has a usage time of three times that of the LCD device in warm white mode and twice that of the LCD device in warm white mode.
Even compared to printed paper, electronic paper displays without front light still show advantages. Bright white printing paper contains fluorescent whitening agents, which not only make the printing paper appear clean blue light bright white, but also increase blue light reflection; The E Ink electronic paper display screen, on the other hand, does not contain fluorescent whitening agents and can be considered safer for the eyes than printed paper.
In addition to blue light research work, E Ink has also been studying the impact of using paper or LCD displays and electronic paper displays on carbon dioxide. Research has found that using E Ink electronic paper displays can significantly reduce carbon dioxide emissions. Taking a financial institution with 125 branches as an example, the introduction of electronic paper laptops can reduce the use of 16.5 million A4 sheets of paper per year, indirectly reducing carbon dioxide emissions by 1100 tons per year. Over the past five years, approximately 130 million e-book readers have been used globally, replacing the purchase and reading of printed books with digital reading models. Assuming 130 million e-book readers download an average of 10 books per year, reading on paper books or LCD tablets would generate 100000 times and 50 times carbon dioxide emissions, respectively, compared to using e-book readers.
Over the past 7 years, approximately 600 million electronic paper price tags around 3 inches have been installed worldwide. Assuming that the price information is changed four times a day, the carbon dioxide emissions generated by using paper price tags are 32000 times that of electronic paper price tags. If we replace LCD billboards of the same size with 10 inch electronic paper billboards, continue to use them for 5 years and replace the display screen 4 times a day, each time using electricity to produce these electronic papers, we can save 400 degrees of electricity consumption for the Earth. Low power consumption electronic paper should be used for smart bus stop signs, combined with solar powered electronic paper billboards, using 100% renewable energy, becoming a global smart transportation solution to promote net zero carbon emissions.
