TOUCH PANEL

• US 20110304579A1
• Filed: 10/13/2010
• Published: 12/15/2011
• Est. Priority Date: 06/11/2010
• Status: Active Grant

• Current Assignee: Beijing FUNATE Innovation Technology Co., Ltd. (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Beijing FUNATE Innovation Technology Co., Ltd. (Hon Hai Precision Industry Co., Ltd.)
• Inventors: FENG, CHEN, QIAN, LI, LIU, LIANG
• Granted Patent: US 9,304,630 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A touch panel includes a first electrode plate, a second electrode plate, and a capacitive detector. The first electrode plate includes a first transparent conductive layer. The second electrode plate includes a second transparent conductive layer opposite to and spaced from the first transparent conductive layer. The second transparent conductive layer is a conductive film having different resistance along different directions. The capacitive detector is electrically connected with the first electrode plate.

Claims

1. A touch panel comprising:

a first electrode plate comprising a first transparent conductive layer;

a second electrode plate comprising a second transparent conductive layer opposite to and spaced from the first transparent conductive layer, the second transparent conductive layer being a conductive film having different resistance along different directions; and

a capacitive detector electrically connected with the first electrode plate.

2. The touch panel of claim 1, further comprising a resistive touch panel detector electrically connected with the first electrode plate and the second electrode plate.

3. The touch panel of claim 1, wherein the first electrode plate further comprises a first electrode located at a surface of the first transparent conductive layer and superposed with four sides of the first conductive layer.

4. The touch panel of claim 3, wherein the first electrode is electrically connected with the capacitive detector.

5. The touch panel of claim 1, wherein a first resistivity of the second transparent conductive layer along a first direction is lager than a second resistivity along a second direction substantially perpendicular with the first direction.

6. The touch panel of claim 5, wherein the second electrode plate further comprises a second electrode located at one end of the second transparent conductive layer and a plurality of detecting electrodes located at another end of the second transparent conductive layer.

7. The touch panel of claim 6, wherein the first electrode is linear and oriented substantially along the first direction, each of the plurality detecting electrodes is block shaped, and the plurality of detecting electrodes are arranged substantially along the first direction.

8. The touch panel of claim 6, wherein a resistivity of the first transparent conductive layer along the second direction is larger than a resistivity of the first transparent conductive layer along the first direction.

9. The touch panel of claim 8, wherein the second electrode plate further comprises a second electrode located at one end of the second transparent conductive layer and oriented substantially along the second direction, and a plurality of detecting electrodes located at another end of the second transparent conductive layer and arranged substantially along the second direction.

10. The touch panel of claim 5, wherein a ratio between the first resistivity and the second resistivity is larger than or equal to 2.

11. The touch panel of claim 5, wherein a ratio between the first resistivity and the second resistivity is larger than or equal to 5.

12. The touch panel of claim 5, wherein the second transparent conductive layer comprises a carbon nantoube layer structure comprising a plurality of carbon nanotubes substantially oriented along the second direction.

13. The touch panel of claim 12, wherein the carbon nanotube layer structure is a pure structure of carbon nanotubes.

14. The touch panel of claim 13, wherein the plurality of carbon nanotubes in the carbon nanotube layer structure are joined end-to-end with each other via Van der Waals attractive force.

15. The touch panel of claim 13, wherein the carbon nanotube layer comprises at least one carbon nanotube film comprising a plurality of successively oriented carbon nanotube segments joined end-to-end by Van der Waals attractive force therebetween, and each carbon nanotube segment includes a number of carbon nanotubes substantially parallel to each other and joined by Van der Waals attractive force therebetween.

16. The touch panel of claim 5, wherein the second electrode plate further comprises a plurality of first detecting electrodes located at one end of the second transparent conductive layer and a plurality of second detecting electrodes located at another end of the second transparent conductive layer.

17. The touch panel of claim 16, wherein each of the plurality of first detecting electrodes and each of the plurality of second detecting electrodes are both block shaped, and the plurality of first detecting electrodes are arranged substantially along the first direction, the plurality of second detecting electrodes are arranged substantially along the first direction.

18. A touch panel comprising:

a first electrode plate comprising a first transparent conductive layer;

a second electrode plate comprising a second transparent conductive layer opposite to and spaced from the first transparent conductive layer, the second transparent conductive layer having different resistivity along different directions;

a capacitive detector electrically connected with the first transparent conductive layer to detect a capacitive signal between the first transparent conductive layer and a touching object; and

a resistive touch panel detector electrically connected with the second transparent conductive layer to detect a voltage signal between the first transparent conductive layer and the second transparent conductive layer, wherein the capacitive detector and the resistive touch panel detector are selected to perform work in response to force applied on the first electrode plate.

19. The display device of claim 18, wherein a first resistivity of the second transparent conductive layer along a first direction is lager than a second resistivity along a second direction substantially perpendicular with the first direction.

20. The display device of claim 19, wherein the second transparent detecting layer is a pure structure of carbon nanotubes, and the carbon nanotubes in the second transparent layer are joined end-to-end with each other and oriented substantially along the second direction.