Touch panel

• US 7,215,331 B2
• Filed: 10/31/2002
• Issued: 05/08/2007
• Est. Priority Date: 11/14/2001
• Status: Expired due to Fees

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Yu, Hwan Seong, Song, In Duk, Bang, Yong Ik
• Primary Examiner(s): Awad; Amr A.
• Assistant Examiner(s): HOLTON, STEVEN E
• Application Number:
  US10/284,476
• Publication Number:
  US 20030095111A1
• Time in Patent Office: 1,650 Days
• Field of Search: 345/173, 345/174, 178/18.01, 178/18.03
• US Class Current: 345/173
• 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 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures

Abstract

A touch panel includes first and second substrates. Each substrate includes an extension formed at one side thereof, first and second transparent electrodes on each of the surfaces of the first and second substrates facing each other, and a signal line bonded to the transparent electrodes at the extension, for applying a signal to each transparent electrode.

Claims

1. A touch panel comprising:

first and second opposing substrates, each substrate having an extension formed at one side, and each substrate having a dead space area and a viewing area;

first and second transparent electrodes formed on surfaces of the first and second substrates facing each other;

a first signal transmitting metal electrode connected to the first transparent electrode;

a second signal transmitting metal electrode connected to the second transparent electrode;

a signal line for applying a signal to each transparent electrode,

a conductive sealant for electrically bonding the signal line to the first signal transmitting metal electrode and the second signal transmitting metal electrode in the extension; and

an insulating sealant for bonding the first and second substrates to each other,

wherein the conductive sealant has a melting point that is below a melting point of the insulating sealant, and wherein the insulating sealant and extension prevent the conductive sealant from flowing into the viewing area when the signal line is bonded to the first signal transmitting metal electrode and the second signal transmitting metal electrode.

2. The touch panel as claimed in claim 1, wherein the melting point of the conductive sealant is approximately 100°

C.

3. The touch panel as claimed in claim 1, wherein the first signal transmitting metal electrode comprises:

first and second metal electrodes electrically connected to opposite sides of the first transparent electrode; and

third and fourth metal electrodes electrically connected to each of the first and second metal electrodes, wherein at least a portion of the third and fourth metal electrodes are located in the extension.

4. The touch panel as claimed in claim 3, wherein the second signal transmitting metal electrode comprises:

fifth and sixth metal electrodes electrically connected to lower and upper sides of the second transparent electrode; and

seventh and eighth metal electrodes electrically connected to each of the fifth and sixth metal electrodes, wherein at least a portion of the seventh and eighth metal electrodes are located in the extension.

5. The touch panel as claimed in claim 1, wherein the extension is formed at a central portion of one side of each of the first and second substrates.

6. The touch panel as claimed in claim 1, wherein the extension is formed from an upper corner to a central portion of one side of each of the first and second substrates.

7. The touch panel as claimed in claim 6, wherein the extension comprises first and second regions, wherein the first region includes the conductive sealant, and wherein the second region includes the insulating sealant.

8. The touch panel as claimed in claim 1, wherein the extension is formed from an upper corner to a lower corner of one side of each of the first and second substrates.

9. The touch panel as claimed in claim 8, wherein the extension comprises first and second regions, wherein the first region includes the conductive sealant, and wherein the second region includes the insulating sealant.

10. A touch panel comprising:

first and second opposing substrates, wherein each of the first and second substrates includes a viewing area, a dead space region surrounding the viewing area, and an extension formed at one side of the substrate;

first and second transparent electrodes formed on surfaces of the first and second substrates facing each other;

metal electrodes connected to the first and second transparent electrodes in the dead space region and formed on the extension;

a signal line bonded to the metal electrodes at the extension;

a conductive sealant for bonding the metal electrodes to the signal line in the extension; and

an insulating sealant for bonding the first and second substrates to each other in the dead space region,

wherein the conductive sealant has a melting point that is below a melting point of the insulating sealant, and wherein the insulating sealant and extension prevent the conductive sealant from flowing into the viewing area when the signal line is bonded to the metal electrodes.

11. The touch panel as claimed in claim 10, wherein the melting point of the conductive sealant is approximately 100°

C.

12. The touch panel as claimed in claim 10, wherein the metal electrodes comprise:

first and second metal electrodes electrically connected to the first transparent electrode and provided at opposite sides of the first transparent electrode in the dead space region;

third and fourth metal electrodes provided in the dead space region and connected to the first and second metal electrodes, respectively, the third and fourth metal electrodes located in the extension,

fifth and sixth metal electrodes electrically connected to the second transparent electrode and provided at lower and upper sides of the second transparent electrode in the dead space region; and

seventh and eighth metal electrodes provided in the dead space region and connected to the fifth and sixth metal electrodes, respectively, the seventh and eighth metal electrodes being located in the extension.

13. The touch panel as claimed in claim 12, wherein the signal line comprises four lines, wherein two lines are connected to the third and fourth metal electrodes in the extension via the conductive sealant, and two lines are connected the seventh and eighth metal electrodes by the conductive sealant.

14. The touch panel as claimed in claim 10, wherein the extension is formed at a central portion of one side of each of the first and second substrates.

15. The touch panel as claimed in claim 10, wherein the extension is formed from an upper corner to a central portion of one side of each of the first and second substrates.

16. The touch panel as claimed in claim 15, wherein the extension comprises first and second regions, the second region being different than the first region, wherein the signal line is bonded in the first region, and the first and second substrates are bonded to each other at the second region.

17. The touch panel as claimed in claim 10, wherein the extension is formed from an upper corner to a lower corner of one side of each of the first and second substrates.

18. The touch panel as claimed in claim 17, wherein the extension comprises first and second regions, the second region being different than the first region, wherein the signal line is bonded in the first region, and the first and second substrates are bonded to each other at the second region.

19. The touch panel as claimed in claim 10, wherein the extension extends past a display device with which the touch panel is to be integrated by a distance of about 2 mm to 3 mm.

20. The touch panel as claimed in claim 19, wherein the display device comprises an LCD device.