SYMMETRIC TOUCH SCREEN SYSTEM WITH CARBON NANOTUBE-BASED TRANSPARENT CONDUCTIVE ELECTRODE PAIRS
First Claim
1. A resistive touch screen device comprising:
- a first and a second flexible electrode, each electrode comprising a sheet of nanotube fabric having a conductive network of unaligned nanotubes, the second flexible electrode disposed in spaced relation to the first flexible electrode,a plurality of spacing elements interposed between the first and second flexible electrodes, the spacing element defining a separation between the first and second flexible electrodes;
wherein under pressure applied to a selected region of the first flexible electrode, said region substantially elastically deforms to reduce the separation, thereby forming an electrically conductive pathway between the first and second flexible electrodes.
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Accused Products
Abstract
A symmetric touch screen switch system in which both the touch side and panelside transparent electrodes are comprised of carbon nanotube thin films is provided. The fabrication of various carbon nanotube enabled components and the assembly of a working prototype touch switch using those components is described. Various embodiments provide for a larger range of resistance and optical transparency for the both the electrodes, higher flexibility due to the excellent mechanical properties of carbon nanotubes. Certain embodiments of the symmetric, CNT-CNT touch switch achieve excellent optical transparency (<3% absorption loss due to CNT films) and a robust touch switching characteristics in an electrical test.
210 Citations
27 Claims
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1. A resistive touch screen device comprising:
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a first and a second flexible electrode, each electrode comprising a sheet of nanotube fabric having a conductive network of unaligned nanotubes, the second flexible electrode disposed in spaced relation to the first flexible electrode, a plurality of spacing elements interposed between the first and second flexible electrodes, the spacing element defining a separation between the first and second flexible electrodes; wherein under pressure applied to a selected region of the first flexible electrode, said region substantially elastically deforms to reduce the separation, thereby forming an electrically conductive pathway between the first and second flexible electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of forming a resistive touch-screen device comprising:
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providing a first flexible electrode comprising a sheet of nanotube fabric having a conductive network of unaligned nanotubes; providing a second flexible electrode comprising a sheet of nanotube fabric having a conductive network of unaligned nanotubes, the second flexible electrode disposed in spaced relation to the first flexible electrode; forming a plurality of spacing elements interposed between the first and second flexible electrodes, the spacing element defining a separation between the first and second flexible electrodes; constructing and arranging the first and second electrodes and plurality of spacing elements such that when pressure is applied to a selected region of the first flexible electrode, said region substantially elastically deforms to reduce the separation, thereby forming an electrically conductive pathway between the first and second flexible electrodes. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification