Touch screen panel for display device and method of manufacturing the same

• US 20140110239A1
• Filed: 12/26/2012
• Published: 04/24/2014
• Est. Priority Date: 04/16/2012
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: LEE, Namseok, YOO, Soonsung, KIM, Chulho, KOOK, Yunho
• Granted Patent: US 9,397,659 B2
• Time in Patent Office: Days
• US Class Current: 200/600
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• 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 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality
• CPC Class Codes: H03K 17/9622 using a plurality of detectors, e.g. keyboard
• CPC Class Codes: H03K 2217/96046 Key-pad combined with display, back-lit

Abstract

A touch screen panel for a display device includes layers of polymer formed on both sides of a substrate for forming driving electrodes and sensing electrodes. The substrate may be made of materials such as polyethylene terephthalate (PET). Instead of bonding a window cover made of a heavy material, layers or polymer are formed on both sides of the substrate to afford rigidity to the touch screen panel. By removing the window cover, the weight and thickness of the touch screen panel can be reduced.

Claims

1. A touch screen panel comprising:

a substrate having a first surface and a second surface at a side opposite to the first surface;

a first polymer layer on the first surface of the substrate;

a plurality of first electrodes extending in a first direction on the second surface of the substrate;

a second polymer layer on the plurality of first electrodes and the second surface of the substrate; and

a plurality of second electrodes extending in a second direction on the second polymer layer, changes in capacitance between the plurality of the second electrodes and the plurality of the first second electrodes detected for sensing touch on the first polymer layer.

2. The touch screen panel of claim 1, wherein the second polymer layer is formed with contact holes to expose each of the plurality of first electrodes to a routing wire.

3. The touch screen panel of claim 2, wherein the routing wire is formed on the second polymer layer and in a corresponding contact hole.

4. The touch screen panel of claim 3, further comprising a conductive auxiliary layer formed on a portion of the routing wire in the corresponding contact hole.

5. The touch screen panel of claim 2, wherein the routing wire is made of metal selected from the group consisting of Al, AlNd, Mo, MoTi, Cu, Cr, Ag, and Ag-based alloys.

6. The touch screen panel of claim 1, wherein the first polymer layer and the second polymer layer are made of a same material.

7. The touch screen panel of claim 1, wherein the first polymer layer and the second polymer layer are formed of an ultraviolet curable resin or a thermosetting resin.

8. The touch screen panel of claim 1, wherein the substrate is formed of a polymer material.

9. The touch screen panel of claim 1, wherein the plurality of first electrodes and the plurality of second electrodes are made of a transparent conductive material selected from the group consisting of ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), GZO (Gallium-doped Zinc Oxide), metal nanowires, and carbon-based transparent electrodes.

10. The touch screen panel of claim 1, wherein each of the plurality of first electrodes has a plurality of intersecting mesh lines, and each of the plurality of second electrodes has a plurality of intersecting mesh lines.

18. The method of claim 10, wherein the substrate is formed of a polymer material.

19. The method of claim 10, wherein the plurality of first electrodes and the plurality of second electrodes are made of a transparent conductive material selected from the group consisting of ITO (Indium Tin Oxide), IZO (Indium Zinc Oxie), GZO (Gallium-doped Zinc Oxide), metal nanowires, and carbon-based transparent electrodes.

20. The method of claim 10, wherein each of the plurality of first electrodes has a plurality of intersecting mesh lines, and each of the plurality of second electrodes has a plurality of intersecting mesh lines.

11. A method of manufacturing a touch screen panel, the method comprising:

forming a first polymer layer on a first surface of a substrate;

forming a plurality of first electrodes extending in a first direction on a second surface of the substrate;

forming a second polymer layer on the plurality of first electrodes and the second surface of the substrate;

forming a plurality of second electrodes extending in a second direction on the second polymer layer, changes in capacitance between the plurality of the second electrodes and the plurality of the first second electrodes detected for sensing touch on the first polymer layer.

12. The method of claim 11, further comprising forming contact holes in the second polymer layer after forming the second polymer layer on the plurality of the first electrodes and the second surface of the substrate.

13. The method of claim 12, wherein forming the contract hole comprises forming a sacrificial layer on the plurality of first electrodes on locations where the contact holes are to be formed.

14. The method of claim 12, further comprising forming a routing wire on the second polymer layer and in a corresponding contact hole.

15. The method of claim 14, further comprising forming a conductive auxiliary layer on a portion of the routing wire in the corresponding contact hole.

16. The method of claim 14, wherein the routing wire is made of metal selected from the group consisting of Al, AlNd, Mo, MoTi, Cu, Cr, Ag, and Ag-based alloys.

17. The method of claim 16, wherein the first polymer layer and the second polymer layer are formed of an ultraviolet curable resin or a thermosetting resin.