The discovery was made by accident while researchers were tinkering with graphene-covered silicon oxide sheets. These silicon plates are dotted with holes that are about 10 times the diameter of a human hair. Graphene covers the cavities like a drum skin. In the process of working with these materials, scientists discovered that these bubble-shaped graphene will change color as the pressure in the cavity changes. When the pressure changes, the graphene becomes concave or bulged. This changes the refraction of light, causing it to appear a different color.
Artist's impression of graphene pixels
Researcher Santiago Cartamil-Bueno said:
"In principle, graphene is transparent. It is so thin that light cannot be reflected by it. But we used double-layer graphene to make them reflect more light."
When these graphene bubbles swell and deflate, light needs to travel through different numbers of graphene to reach the bottom of the silicon oxide cavity. This changes which part of the spectrum is absorbed and which part is reflected. This also changes the color of the graphene bubbles. Cartamil-Bueno explains that recesses of different depths disrupt the light to varying degrees, and they get different colors of reflected light.
This is the same principle as Qualcomm Mirasol technology, which uses a statically controlled reflective film. Similar to electronic ink (E Ink) screens, this type of screen consumes very low energy. After an image is displayed, the display no longer requires any power to maintain the display (refer to electronic paper book equipment). However, this structure also means that the screen cannot be backlit. You cannot use this type of screen in a dark room. They perform best in bright light (the Kindle's backlight is an additional LED light emitter added to the device).
Qualcomm Mirasol display
Next, the researchers will find a way to precisely control the pressure in each cavity. Although the relevant research has not yet been published, Cartamil-Bueno revealed that their team will learn from Qualcomm Mirasol’s solution.
Researchers at the University of Delft are prototyping such a graphene screen, which they hope to showcase to the world at the World Congress tech conference next March. They also cautioned that this research is still in its infancy. Whether the display screen made of bubble graphene has outstanding display effects and whether it can be mass-produced in the future requires further research. But one thing is certain, screens made from graphene will be extremely soft and light (and extremely expensive).
For more related LED information, please click on the Sosoled website (wwwsosoledcom) or follow the WeChat public account
Researcher Santiago Cartamil-Bueno said:
"In principle, graphene is transparent. It is so thin that light cannot be reflected by it. But we used double-layer graphene to make them reflect more light."
When these graphene bubbles swell and deflate, light needs to travel through different numbers of graphene to reach the bottom of the silicon oxide cavity. This changes which part of the spectrum is absorbed and which part is reflected. This also changes the color of the graphene bubbles. Cartamil-Bueno explains that recesses of different depths disrupt the light to varying degrees, and they get different colors of reflected light.
This is the same principle as Qualcomm Mirasol technology, which uses a statically controlled reflective film. Similar to electronic ink (E Ink) screens, this type of screen consumes very low energy. After an image is displayed, the display no longer requires any power to maintain the display (refer to electronic paper book equipment). However, this structure also means that the screen cannot be backlit. You cannot use this type of screen in a dark room. They perform best in bright light (the Kindle's backlight is an additional LED light emitter added to the device).
Qualcomm Mirasol display
Next, the researchers will find a way to precisely control the pressure in each cavity. Although the relevant research has not yet been published, Cartamil-Bueno revealed that their team will learn from Qualcomm Mirasol’s solution.
Researchers at the University of Delft are prototyping such a graphene screen, which they hope to showcase to the world at the World Congress tech conference next March. They also cautioned that this research is still in its infancy. Whether the display screen made of bubble graphene has outstanding display effects and whether it can be mass-produced in the future requires further research. But one thing is certain, screens made from graphene will be extremely soft and light (and extremely expensive).
For more related LED information, please click on the Sosoled website (wwwsosoledcom) or follow the WeChat public account
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