Touch panel device and method of fabricating the same

• US 7,205,909 B2
• Filed: 06/27/2003
• Issued: 04/17/2007
• Est. Priority Date: 08/30/2002
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Lee, Sook Jin
• Primary Examiner(s): Hofsass; Jeffery
• Assistant Examiner(s): Yacob; Sisay
• Application Number:
  US10/606,797
• Publication Number:
  US 20040041796A1
• Time in Patent Office: 1,390 Days
• Field of Search: 341/20, 341/22, 341/23, 345/177, 345/173, 345/175, 333/153
• US Class Current: 341/20
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures
• CPC Class Codes: H05K 2201/055 Folded back on itself
• CPC Class Codes: H05K 2201/056 Folded around rigid support or component
• CPC Class Codes: H05K 2201/10666 Plated through-hole for surface mounting on PCB
• CPC Class Codes: H05K 3/305 Affixing by adhesive
• CPC Class Codes: H05K 3/323 by applying an anisotropic conductive adhesive layer over an array of pads
• CPC Class Codes: H05K 3/361 Assembling flexible printed circuits with other printed circuits
• CPC Class Codes: H05K 3/363 by soldering

Abstract

A touch panel device includes a wiring terminal, a flexible printed circuit film connected to the wiring terminal, an adhesion part corresponding to a location where the flexible printed circuit film is connected to the wiring terminal, and an adhesion-reinforcing part adjacent to the adhesion part for strengthening an adhesive bonding strength of the adhesion part.

Claims

1. A touch panel device having a first substrate and a second substrate, comprising:

a wiring terminal formed on a front surface of any one of the first and second substrates;

a flexible printed circuit film connected to the wiring terminal;

an adhesion part substantially corresponding to a location where the flexible printed circuit film is connected to the wiring terminal; and

an adhesion-reinforcing part formed on a rear surface of the substrate on which the wiring terminal is formed to strengthen a bonding strength of the adhesion part.

2. The device according to claim 1, wherein the flexible printed circuit film includes a bend part where the flexible printed circuit film is bent toward a rear surface of the touch panel device at the adhesion part and includes a substantially “

U”

shaped portion at the rear surface of the touch panel.

3. The device according to claim 2, wherein the adhesion-reinforcing part includes the bend part and a double-sided tape that bonds the bend part to the rear surface of the touch panel.

4. The device according to claim 1, further comprising:

a touch controller for reading a coordinate signal transmitted from the touch panel to control the touch panel; and

a printed circuit board upon which the touch controller is mounted and to which the flexible printed circuit film is bonded.

5. The device according to claim 4, wherein the adhesion-reinforcing part is formed on a surface of the printed circuit board to cover the touch controller and the flexible printed circuit film.

6. The device according to claim 1, wherein the adhesion-reinforcing part includes a solder portion that passes through the adhesive part and contacts the wiring terminal.

7. The device according to claim 1, wherein the adhesion-reinforcing part includes a solder portion that passes through the flexible printed circuit film at a region between an end portion of the wiring terminal and the adhesive part on one side of the wiring terminal, and contacts the wiring terminal.

8. The device according to claim 1, further comprising:

spacers disposed in a space between an upper substrate and a lower substrate;

a first electrode layer formed at a rear surface of the upper substrate;

a first signal line extending from the first electrode layer to electrically connect with the wiring terminal;

a second electrode layer formed on the lower substrate; and

a second signal line extending from the second electrode layer to electrically connect with the wiring terminal.

9. The device according to claim 1, further comprising:

a display panel; and

a backlight device disposed on a rear surface of the display panel to radiate light to the display panel.

10. A method of fabricating a touch panel device having a first substrate and a second substrate, comprising:

forming a wiring terminal formed on a front surface of any one of the first and second substrates;

forming a flexible printed circuit film connected to the wiring terminal;

forming an adhesion part corresponding to a location where the flexible printed circuit film is connected to the wiring terminal; and

forming an adhesion-reinforcing part on a rear surface of the substrate on which the wiring terminal is formed wherein the adhesion-reinforcing part increases an adhesive bonding strength of the adhesion part.

11. The method according to claim 10, wherein the flexible printed circuit film includes a bend part where the flexible printed circuit film is bent toward a rear surface of the touch panel device at the adhesion part and includes a substantially “

U”

shaped portion at the rear surface of the touch panel.

12. The method according to claim 11, wherein the adhesion-reinforcing part includes the bend part and a double-sided tape that bonds the bend part to the rear surface of the touch panel.

13. The method according to claim 10, further comprising:

providing a touch controller for reading a coordinate signal transmitted from the touch panel to control the touch panel; and

providing a printed circuit board upon which the touch controller is mounted and to which the flexible printed circuit film is bonded.

14. The method according to claim 13, wherein the adhesion-reinforcing part is formed on a surface of the printed circuit board to cover the touch controller and the flexible printed circuit film.

15. The method according to claim 10, wherein the adhesion-reinforcing part includes a solder portion that passes through the adhesive part and contacts the wiring terminal.

16. The method according to claim 10, wherein the adhesion-reinforcing part includes a solder portion that passes through the flexible printed circuit film at a region between an end portion of the wiring terminal and the adhesive part on one side of the wiring terminal, and contacts the wiring terminal.

17. The method according to claim 10, further comprising:

forming spacers within a space between an upper substrate and a lower substrate;

forming a first electrode layer formed at a rear surface of the upper substrate;

forming a first signal line extending from the first electrode layer to electrically connect with the wiring terminal;

forming a second electrode layer formed on the lower substrate; and

forming a second signal line extending from the second electrode layer to electrically connect with the wiring terminal.

18. The method according to claim 10, further comprising:

providing a display panel; and

providing a backlight device at a rear surface of the display panel to radiate light to the display panel.