TOUCH PANEL

• US 20110157845A1
• Filed: 12/10/2010
• Published: 06/30/2011
• Est. Priority Date: 12/31/2009
• Status: Active Grant

• Current Assignee: Derlead Investment, Ltd.
• Original Assignee: Derlead Investment, Ltd.
• Inventors: HSU, Jane
• Granted Patent: US 8,379,409 B2
• Time in Patent Office: Days
• US Class Current: 361/749
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0445 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
• CPC Class Codes: H05K 3/361 Assembling flexible printed circuits with other printed circuits

Abstract

A touch panel is characterized in that one side of a top panel protrudes beyond a side of a bottom panel, signals of sensing areas or conductive layer on the top panel for sensing capacitive variation or voltage variation are transmitted to a bottom surface of the protruded side, signals of sensing areas or conductive layer on the bottom panel for sensing capacitive variation or voltage variation are transmitted to a bottom surface of the top panel through conductive adhesives and to the bottom surface of the protruded side, and the top panel has a flexible PCB formed on the bottom surface of the protruded side to receive those signals. As the flexible PCB is not sandwiched between the top and bottom panels, all layers of the touch panel can be uniformly and tightly bonded and touch insensitivity caused by air penetration into the touch panel can be prevented.

Claims

1. A touch panel, comprising:

a bottom panel having;

an EMI shielding layer formed on a bottom surface of the bottom panel;

multiple lower sensing areas formed on a top surface of the bottom panel, parallelly aligned in a first direction, each of the lower sensing areas having multiple lower sensing units serially connected;

multiple first lower ports, each of the first lower ports formed on an edge of one of the outermost lower sensing units in the first direction;

multiple second lower ports collectively formed on a bordering portion of a side of the top surface of the bottom panel, wherein a count of the second lower ports corresponds to that of the first lower ports; and

multiple lower wires formed on the top surface of the bottom panel and respectively connected between the first lower ports and the second lower ports;

an anisotropic conductive film formed on the top surface of the bottom panel and covered on the second lower ports;

an insulating layer formed on the top surface of the bottom panel;

a top panel formed on the anisotropic conductive film and the insulating layer, being larger than the lower panel and having;

a protruded side protruding beyond the side of the bottom panel having the second lower ports thereon;

multiple upper sensing areas formed on a bottom surface of the top panel, parallelly aligned in a second direction that is perpendicular to the first direction, and each of the upper sensing areas having multiple upper sensing units serially connected;

multiple first upper ports, each of the first upper ports formed on an edge of one of the outermost upper sensing units in the second direction;

multiple second upper ports formed on the bottom surface of the top panel and extending to a bottom surface of the protruded side, wherein a count of the second upper ports corresponds to that of the first upper ports;

multiple transfer ports formed on the bottom surface of the top panel and extending to the bottom surface of the protruded side, wherein a count of the transfer ports corresponds to that of the second lower ports, and one end of each of the transfer ports corresponds to and is electrically connected with a corresponding second lower port; and

multiple upper wires formed on the bottom surface of the top panel and respectively connected between the first upper ports and the second upper ports; and

a flexible PCB mounted on the bottom surface of the protruded side, and electrically connected with the second upper ports and the transfer ports.

2. The touch panel as claimed in claim 1, wherein the upper sensing units correspond to a portion unfilled by the lower sensing units of the lower panel.

3. The touch panel as claimed in claim 1, wherein the upper sensing units and the lower sensing units are composed of indium tin oxide (ITO).

4. The touch panel as claimed in claim 2, wherein the upper sensing units and the lower sensing units are composed of indium tin oxide (ITO).

5. The touch panel as claimed in claim 1, wherein the lower wires and the upper wires are conductive silver wires.

6. The touch panel as claimed in claim 2, wherein the lower wires and the upper wires are conductive silver wires.

7. The touch panel as claimed in claim 3, wherein the lower wires and the upper wires are conductive silver wires.

8. The touch panel as claimed in claim 4, wherein the lower wires and the upper wires are conductive silver wires.

9. The touch panel as claimed in claim 1, wherein the EMI shielding layer is composed of ITO.

10. The touch panel as claimed in claim 2, wherein the EMI shielding layer is composed of ITO.

11. The touch panel as claimed in claim 3, wherein the EMI shielding layer is composed of ITO.

12. The touch panel as claimed in claim 4, wherein the EMI shielding layer is composed of ITO.

13. A touch panel, comprising:

a bottom panel;

a lower conductive layer formed on a top surface of the bottom panel, and having at least one lower electrode, wherein one end of each lower electrode extends to one side of the lower conductive layer;

a separation layer formed on a top surface of the lower conductive layer;

an insulating layer formed on the top surface of the lower conductive layer, surrounding a border of the separation layer, covered on the lower electrodes, and having multiple conductive adhesives formed on locations of the insulating layer to respectively correspond to and contact with the lower electrodes;

an upper conductive layer formed on top surfaces of the separation layer and the insulating layer, being larger than the lower panel, and having;

a protruded side protruding beyond the side of the lower panel having the at least one lower electrode;

at least one upper electrode formed on a bottom surface of the upper conductive layer and extending alongside three sides of the bottom surface, wherein a contact end of each of the at least one upper electrode extends to a bottom surface of the protruded side of the upper conductive layer; and

multiple transfer ports formed on the bottom surface of the protruded side, wherein a count of the transfer ports corresponds to that of the lower electrodes, and each of the transfer ports is contacted with one of the conductive adhesives on the insulating layer;

a top panel formed on a top surface of the upper conductive layer; and

a flexible PCB mounted on the bottom surface of the protruded side, and electrically connected with the transfer ports and the contact end of each of the at least one upper electrode.

14. The touch panel as claimed in claim 13, wherein the upper electrodes and the lower electrodes are silver electrodes.

15. The touch panel as claimed in claim 13, wherein the upper conductive layer and the lower conductive layer are composed of ITO.

16. The touch panel as claimed in claim 14, wherein the upper conductive layer and the lower conductive layer are composed of ITO.

17. The touch panel as claimed in claim 13, wherein the conductive adhesives are anisotropic conductive adhesives.

18. The touch panel as claimed in claim 14, wherein the conductive adhesives are anisotropic conductive adhesives.

19. The touch panel as claimed in claim 15, wherein the conductive adhesives are anisotropic conductive adhesives.

20. The touch panel as claimed in claim 16, wherein the conductive adhesives are anisotropic conductive adhesives.