Touch panel and display device using the same

• US 8,199,119 B2
• Filed: 09/29/2008
• Issued: 06/12/2012
• Est. Priority Date: 12/12/2007
• Status: Active Grant

• Current Assignee: Beijing FUNATE Innovation Technology Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Beijing FUNATE Innovation Technology Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Inventors: Jiang, Kai-Li, Liu, Liang, Fan, Shou-Shan
• Primary Examiner(s): Hindi, Nabil
• Application Number:
  US12/286,227
• Publication Number:
  US 20090153515A1
• Time in Patent Office: 1,352 Days
• Field of Search: 345/173, 345/174, 438/408, 438/1.3, 438/1.4, 359/489.2, 313/495
• US Class Current: 345/173
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0444 using a single conductive element covering the whole sensing surface, e.g. by sensing the electrical current flowing at the corners

Abstract

A touch panel includes a substrate, a transparent conductive layer, and at least two electrodes. The transparent conductive layer is formed on a surface of the substrate. The transparent conductive layer includes a carbon nanotube layer, and the carbon nanotube layer includes a plurality of carbon nanotubes arranged along a same direction. The electrodes are electrically connected with the transparent conductive layer. Further, a display device using the touch panel is also included.

Claims

1. A touch panel comprising:

a substrate comprising a first surface and a second surface opposite to the first surface;

a transparent conductive layer located on the substrate, the transparent conductive layer comprising a carbon nanotube layer, the carbon nanotube layer comprising a plurality of carbon nanotubes, a majority of carbon nanotubes in the carbon nanotube layer are arranged along a same direction; and

four electrodes being electrically connected with the transparent conductive layer and located on a surface of the transparent conductive layer,

wherein the carbon nanotube layer comprises a carbon nanotube film, and the carbon nanotube film comprises a plurality of successively oriented carbon nanotube segments joined end to end by the van der Waals attractive force therebetween, and each carbon nanotube segment comprising the plurality of carbon nanotubes that are combined by van der Waals attractive force therebetween.

2. The touch panel as claimed in claim 1, wherein a thickness of the carbon nanotube film approximately ranges from 0.5 nanometers to 100 micrometers.

3. The touch panel as claimed in claim 1, wherein the carbon nanotubes in the carbon nanotube layer can be selected from the group consisting of single-walled carbon nanotubes, double-walled carbon nanotubes, and multi-walled carbon nanotubes.

4. The touch panel as claimed in claim 1, wherein the electrodes are located on a surface of the transparent conductive layer.

5. The touch panel as claimed in claim 4, wherein the electrodes are adhered to the surface of the transparent conductive layer using a silver-based slurry, the electrodes being metal electrodes.

6. The touch panel as claimed in claim 1, further comprising a transparent protective layer located on a surface of the transparent conductive layer.

7. The touch panel as claimed in claim 6, wherein the material of the transparent protective layer is selected from a group consisting of silicon nitride, silicon dioxide, benzocyclobutenes, polyester film, and polyethylene terephthalate.

8. The touch panel as claimed in claim 1, further comprising a shielding layer located on the second surface of the substrate.

9. The touch panel as claimed in claim 8, wherein the shielding layer is a carbon nanotube film comprising a plurality of carbon nanotubes arranged along a same direction.

15. The touch panel as claimed in claim 1, wherein the carbon nanotube layer comprises a plurality of coplanar carbon nanotube films.

16. The touch panel as claimed in claim 1, wherein the transparent conductive layer consists of the carbon nanotube layer, the carbon nanotube layer consists of the plurality of carbon nanotubes.

10. A display device comprising:

a touch panel comprising;

a substrate;

a transparent conductive layer located on the substrate, the transparent conductive layer comprising a carbon nanotube layer, the carbon nanotube layer consisting of a plurality of carbon nanotubes arranged along a same direction; and

four electrodes directly and electrically connected with the transparent conductive layer; and

a display element positioned opposite and adjacent to the touch panel.

11. The display device as claimed in claim 10, further comprising a touch panel controller, a central processing unit, and a display element controller electrically connected to each other, the touch panel controller being connected to the touch panel, and the display element controller being connected to the display element.

12. The display device as claimed in claim 10, wherein the touch panel is spaced from the display element with a distance.

13. The display device as claimed in claim 10, wherein the touch panel is located on the display element.

14. The display device as claimed in claim 10, further comprising a passivation layer located on the touch panel and the passivation layer being comprised of one of silicon nitrides and silicon dioxides.

17. A touch panel comprising:

a substrate;

a transparent conductive layer located on the substrate, the transparent conductive layer consisting of a carbon nanotube layer, the carbon nanotube layer consisting of a plurality of carbon nanotubes arranged along a same direction; and

four electrodes being electrically connected with the transparent conductive layer.