Touch panel and display device using the same

• US 8,253,700 B2
• Filed: 09/29/2008
• Issued: 08/28/2012
• Est. Priority Date: 12/14/2007
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd., Tsinghua University
• Original Assignee: Hon Hai Precision Industry Co., Ltd., Tsinghua University
• Inventors: Jiang, Kai-Li, Liu, Liang, Fan, Shou-Shan
• Primary Examiner(s): Patel, Nimeshkumar
• Assistant Examiner(s): Bowman, Mary Ellen
• Application Number:
  US12/286,181
• Publication Number:
  US 20090153521A1
• Time in Patent Office: 1,429 Days
• Field of Search: 345/173, 524/496, 257/222, 349/12, 313/336, 428/339
• US Class Current: 345/173
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

An exemplary touch panel includes a flexible substrate, a transparent conductive layer, and four electrodes. The flexible substrate includes a surface. The transparent conductive layer is disposed on the surface of the substrate. The transparent conductive layer includes a carbon nanotube layer. The carbon nanotube layer includes carbon nanotubes. The electrodes are separately disposed, and electrically connected with the transparent conductive layer. A display device using the above-described touch panel is also provided.

Claims

1. A capacitance-type touch panel comprising:

a flexible substrate comprising a surface;

a transparent conductive layer disposed on the surface of the substrate, the transparent conductive layer comprising a carbon nanotube layer; and

at least two electrodes electrically connected with the transparent conductive layer,

wherein the carbon nanotube layer comprises a plurality of carbon nanotube films directly stacked on each other, each of the plurality of carbon nanotube films comprises a plurality of carbon nanotubes oriented along a same direction, an angle between the plurality of carbon nanotubes in two adjacent carbon nanotube films is greater than 0° and

less than or equal to 90°

, the plurality of carbon nanotubes are non-functionalized carbon nanotubes.

2. The capacitance-type touch panel as claimed in claim 1, wherein the plurality of carbon nanotube films is coplanar.

3. The capacitance-type touch panel as claimed in claim 1, wherein the plurality of carbon nanotubes are parallel to a surface of the plurality of carbon nanotube films.

4. The capacitance-type touch panel as claimed in claim 1, wherein the plurality of carbon nanotubes in each of the plurality of carbon nanotube films are successive and joined end to end by van der Waals attractive force therebetween.

5. The capacitance-type touch panel as claimed in claim 1, wherein the plurality of carbon nanotubes is selected from the group consisting of single-walled carbon nanotubes, double-walled carbon nanotubes, and multi-walled carbon nanotubes, diameters of the single-walled carbon nanotubes, the double-walled carbon nanotubes, and the multi-walled carbon nanotubes are respectively in the approximate range from 0.5 to 50 nanometers, 1 to 50 nanometers, and 1.5 to 50 nanometers.

6. The capacitance-type touch panel as claimed in claim 1, wherein the material of the flexible substrate is selected from the group consisting of polycarbonate, polymethyl methacrylate, polyethylene terephthalate, polyether sulfones, polyvinyl chloride, benzocyclobutenes, polyesters, and acrylic resins.

7. The capacitance-type touch panel as claimed in claim 1, wherein the at least two electrodes are separately disposed on the transparent conductive layer, and the material of the electrodes is selected from the group consisting of metal, conductive resins, and silver pastes.

8. The capacitance-type touch panel as claimed in claim 1, further comprising a transparent protective film disposed on a surface of the transparent conductive layer, wherein the material of the transparent protective film is selected from the group consisting of benzocyclobutenes, polyesters, acrylic resins, polyethylene terephthalate, and any combination thereof.

9. The capacitance-type touch panel as claimed in claim 1, further comprising a shielding layer disposed on the substrate, wherein the material of the shielding layer is selected from the group consisting of conductive resin films, carbon nanotube films, and any combination thereof.

10. The capacitance-type touch panel as claimed in claim 9, wherein the shielding layer comprises a plurality of carbon nanotubes aligned parallel to a same direction.

11. A display device comprising:

a capacitance-type touch panel comprising;

a flexible substrate,

a transparent conductive layer disposed on a surface of the substrate, and

at least two electrodes electrically connected with the transparent conductive layer; and

a display element adjacent to the touch panel,

wherein the transparent conductive layer consists of a carbon nanotube layer, and the carbon nanotube layer consists of a plurality of carbon nanotubes, the plurality of carbon nanotubes are non-functionalized carbon nanotubes.

12. The display device as claimed in claim 11, further comprising a first controller configured for controlling the capacitance-type touch panel, a central processing unit, and a second controller configured for controlling the display element, the first controller, the central processing unit and the second controller being electrically connected with each other, the display element being connected to the second controller, and the capacitance-type touch panel being connected to the first controller.

13. The display device as claimed in claim 11, wherein the display element is selected from the group consisting of e-papers, flexible liquid crystal displays, and flexible organic light emitting displays.

14. The display device as claimed in claim 11, further comprising a passivation layer disposed between the capacitance-type touch panel and the display element, wherein the material of the passivation layer is selected from the group consisting of benzocyclobutenes, polyesters, acrylic resins, polyethylene terephthalate, and any combination thereof.

15. The display device as claimed in claim 11, wherein the carbon nanotube layer consists of a plurality of carbon nanotube films directly stacked on each other, the plurality of carbon nanotubes in each of the plurality of carbon nanotube films are oriented along a same direction, and an angle between the plurality of carbon nanotubes in two adjacent carbon nanotube films is greater than 0°

and less than or equal to 90°

.

16. The display device as claimed in claim 15, wherein the plurality of carbon nanotubes in each of the plurality of carbon nanotube films are successive and joined end to end by van der Waals attractive force therebetween.

17. A capacitance-type touch panel comprising:

a flexible substrate comprising a surface;

a transparent conductive layer disposed on the surface of the substrate, the transparent conductive layer comprising a carbon nanotube layer; and

at least two electrodes electrically connected with the transparent conductive layer,

wherein the carbon nanotube layer comprises at least one carbon nanotube film, and the at least one carbon nanotube film comprises a plurality of carbon nanotubes oriented along a same direction, the plurality of carbon nanotubes are non-functionalized carbon nanotubes.

18. The capacitance-type touch panel as claimed in claim 17, wherein the plurality of carbon nanotubes are successive and joined end to end by van der Waals attractive force therebetween.

19. The capacitance-type touch panel as claimed in claim 18, wherein the transparent conductive layer consists of the carbon nanotube layer, and the carbon nanotube layer consists of the plurality of carbon nanotubes.