At Harvard invented flexible transparent speaker hydrogel

At Harvard University have created a transparent speaker that can be placed directly on a computer screen or TV. It consists of several layers of transparent resin - between two layers of a hydrogel impregnated with brine, is an insulator. The electrodes are arranged on the perimeter. The principle of operation resembles the work электростатического speaker - two layers of conductive hydrogel attract or repel depending on the voltage applied to them. Such a loudspeaker is capable of reproducing the entire audible frequency range, moreover it can vibrate at selected locations to provide tactile feedback.



Like any electrostatic loudspeaker, soft speaker requires a high voltage for operation - about 10 kilovolts, but the currents there are quite small. While the technology is ready for commercial use, especially on mobile devices, but the prospects look tempting - except for sound and vibration flexible speaker can change the topography of the screen, creating, for example, on the site of the convexity of keys on-screen keyboard, as well as serve as a sensor - press it changes capacitance. Other applications - for example, to fix a gel speaker on the window glass and used for active noise cancellation .

Articles describing the technology can be downloaded from Harvard University ( PDF ), and on the website of the journal Science available download additional materials .



Source: habrahabr.ru/post/217745/

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