TOUCH SUBSTRATE AND DISPLAY APPARATUS HAVING THE SAME

• US 20130113734A1
• Filed: 10/23/2012
• Published: 05/09/2013
• Est. Priority Date: 11/08/2011
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: GOH, Joon-Chul, CHAI, Chong-Chul, LIM, Jae-Keun, LEE, Cheol-Gon, PARK, Ji-Hong, CHO, Young-Joon
• Granted Patent: US 9,342,166 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• 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

Abstract

In a touch substrate and a display apparatus, the touch substrate includes a first electrode, a second electrode, a first touch electrode and a blocking layer. The first electrode includes an opaque conductive material and extends along a first direction. The second electrode includes the opaque conductive material, extends along a second direction crossing the first direction, and has a gap through which the first electrode extends. The first touch electrode is formed on the first electrode and is electrically connected to the first electrode. The blocking layer overlaps the first and second electrodes.

Claims

1. A touch substrate comprising:

a first electrode including an opaque conductive material and extending along a first direction;

a second electrode including the opaque conductive material, extending along a second direction crossing the first direction, the second electrode having a gap through which the first electrode extends;

a first touch electrode formed on the first electrode and electrically connected to the first electrode; and

a blocking layer overlapping the first and second electrodes.

2. The touch substrate of claim 1, wherein:

the first electrode comprises a plurality of first main electrodes, a plurality of first connecting electrodes and a plurality of first contact holes,

each of the first connecting electrodes extends along the first direction, connects adjacent ones of the first main electrodes to each other, and has a width narrower than its respective adjacent first main electrodes, and

the first main electrodes are exposed through a respective one of the first contact holes.

3. The touch substrate of claim 2, wherein the first touch electrode overlaps with one of the first main electrodes, and the first touch electrode is electrically connected to the one of the first main electrodes through one of the first contact holes.

4. The touch substrate of claim 3, wherein an area of the first touch electrode is larger than an area of one of the first main electrodes.

5. The touch substrate of claim 1, wherein:

the second electrode comprises a plurality of second main electrodes, a plurality of second connecting electrodes and a plurality of second contact holes,

the second connecting electrodes extend along the second direction, connect adjacent ones of the second main electrodes to each other, and have gaps spanning intervening first main electrodes, and

each second main electrode is exposed through one of the second contact holes.

6. The touch substrate of claim 1, wherein the second electrode is formed on the touch substrate, and the second electrode further comprises a plurality of second touch electrodes each electrically connecting two of the second connecting electrodes that lie on opposite ends of one of the gaps.

7. The touch substrate of claim 6, wherein each second touch electrode overlaps a pair of the second main electrodes corresponding to one of the gaps, and is electrically connected to the pair of the second main electrodes through the corresponding second contact hole.

8. The touch substrate of claim 7, wherein an area of the second touch electrode is larger than that of the second main electrode.

9. The touch substrate of claim 6, wherein the second touch electrode includes a transparent conductive material.

10. The touch substrate of claim 6, wherein the second touch electrode is formed on a first surface of the touch substrate.

11. The touch substrate of claim 1, wherein the first touch electrode includes a transparent conductive material.

12. The touch substrate of claim 1, wherein the blocking layer is formed between the first electrode and the second touch electrode.

13. The touch substrate of claim 1, further comprising a color filter formed on the first and second electrodes,

wherein the first and second electrodes, and the first touch electrode are each formed on a first surface of the touch substrate.

14. A touch substrate comprising:

a first electrode including an opaque conductive material and extending along a first direction;

a second electrode including the opaque conductive material, extending along a second direction crossing the first direction, the second electrode having a gap through which the first electrode extends;

a first touch electrode formed under the first electrode and electrically connected to the first electrode; and

a blocking layer overlapping the first and second electrodes.

15. The touch substrate of claim 14, further comprising an overcoating layer covering the blocking layer to planarize a surface of the touch substrate.

16. A display apparatus comprising:

a touch substrate comprising a first electrode, a second electrode, a first touch electrode and a blocking layer, the first electrode extending along a first direction, the second electrode extending along a second direction crossing the first direction and having a gap through which the first electrode extends, the first touch electrode being formed on the first electrode and being electrically connected to the first electrode, the blocking layer overlapping the first and second electrodes;

an array substrate comprising a touch signal pad for transmitting a touch signal, and further comprising a data pad; and

a connecting portion electrically connecting the second electrode and the touch signal pad.

17. The display apparatus of claim 16, further comprising a flexible printed circuit board electrically connected to the data pad and the touch signal pad.

18. The display apparatus of claim 16, wherein the first and second electrodes, and the touch signal pad each include an opaque conductive material.

19. The display apparatus of claim 16, wherein the touch substrate comprises a third connecting electrode electrically connected to the second electrode, and

the array substrate comprises a fourth connecting electrode electrically connected to the touch signal pad.

20. The display apparatus of claim 19, wherein each of the third and fourth connecting electrodes includes a transparent conductive material.

21. The display apparatus of claim 20, wherein the connecting portion is a conductive bump disposed between the third and fourth connecting electrodes and electrically connecting the third connecting electrode to the fourth connecting electrode.

22. The display apparatus of claim 21, wherein the conductive bump includes indium.

23. The display apparatus of claim 20, wherein the touch substrate further comprises a spacer maintaining a space between the touch substrate and the array substrate, and

the third connecting electrode is electrically connected to the first electrode and covers the spacer.

24. The display apparatus of claim 23, wherein the third connecting electrode contacts the fourth connecting electrode.

25. The display apparatus of claim 16, wherein the first and second electrodes, and the first and second touch electrodes are all formed on a first surface of the touch substrate, and

the touch substrate further comprises a color filter formed on the first and second electrodes.

26. A display apparatus comprising:

a touch substrate comprising a first electrode, a second electrode, a first touch electrode and a blocking layer, the first electrode extending along a first direction, the second electrode extending along a second direction crossing the first direction and having a gap through which the first electrode extends, the first touch electrode being formed under the first electrode and being electrically connected to the first electrode, the blocking layer overlapping the first and second electrodes;

an array substrate comprising a touch signal pad for transmitting a touch signal, and further comprising a data pad; and

a connecting portion electrically connecting the second electrode and the touch signal pad.

27. The display apparatus of claim 26, wherein the display apparatus further comprises an overcoating layer covering the blocking layer to planarize a surface of the touch substrate.