Display apparatus with touch sensor

Patent metadata

Field	Value
Publication number	US-10976848-B2
Application number	US-201916510276-A
Country	US
Kind code	B2
Filing date	Jul 12, 2019
Priority date	Jul 19, 2018
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

A display apparatus includes a substrate; a display area defined on the substrate and on which a plurality of pixels are disposed; a pad area defined on the substrate and on which a plurality of pads are disposed; a circuit area including a plurality of multiplexer circuits disposed between the display area and the pad area; a touch sensor part including a plurality of touch electrodes disposed at the display area; a plurality of touch electrode lines connecting the plurality of touch electrodes and the plurality of multiplexer circuits; and a touch wiring connecting the plurality of multiplexer circuits and the plurality of pads, wherein the plurality of multiplexer circuits selectively connects a touch electrode line among the plurality of touch electrode lines with the touch wiring.

First claim

What is claimed is:

1. A display apparatus comprising:
a substrate;
a display area defined on the substrate and on which a plurality of pixels are disposed;
a pad area defined on the substrate and on which a plurality of pads are disposed;
a circuit area including a plurality of multiplexer circuits disposed between the display area and the pad area;
a touch sensor part including a plurality of touch electrodes disposed at the display area;
a plurality of touch electrode lines connecting the plurality of touch electrodes and the plurality of multiplexer circuits; and
a touch wiring connecting the plurality of multiplexer circuits and the plurality of pads,
wherein the plurality of multiplexer circuits selectively connects a touch electrode line among the plurality of touch electrode lines with the touch wiring, and
wherein the plurality of pads includes a first pad for supplying a touch signal and a second pad for supplying a display signal, and the touch wiring is connected to the first pad for supplying the touch signal, and
wherein the plurality of multiplexer circuits is disposed on the same substrate as the plurality of pads including the first pad and the second pad.

2. The display apparatus of claim 1 , further comprising:
a cathode layer disposed on the substrate; and
an encapsulation layer disposed on the cathode layer, wherein the touch electrode is disposed on the encapsulation layer.

3. The display apparatus of claim 2 , wherein the touch electrode line is disposed along a side surface of the encapsulation layer in an outer area of the display area.

4. The display apparatus of claim 2 , further comprising a buffer layer disposed on the encapsulation layer, wherein the touch electrode is disposed on the buffer layer disposed on the encapsulation layer.

5. The display apparatus of claim 1 , wherein the multiplexer circuit includes a same metal as the touch electrode line.

6. The display apparatus of claim 1 , further comprising a bending area on the substrate disposed between the circuit area and the pad area or between the display area and the circuit area.

7. The display apparatus of claim 6 , wherein the bending area includes a first organic film disposed on the substrate, a first wiring disposed on the first organic film, a second organic film disposed on the first wiring, a second wiring disposed on the second organic film where a contact hole is formed corresponding to at least two points, and
wherein the second wiring is connected to the first wiring through the contact hole.

8. The display apparatus of claim 7 , wherein the second wiring includes the touch electrode lines.

9. The display apparatus of claim 1 , wherein the plurality of multiplexer circuits selects one among at least two of the touch electrode lines in response to a selection signal, and transfers the touch signal to the selected touch electrode lines.

10. The display apparatus of claim 1 , wherein the plurality of multiplexer circuits comprises:
a first operator which receives a touch signal, a first selection signal, and a second selection signal, performs NOT operations on the first selection signal and the second selection signal, performs AND operation on the NOT operated first selection signal, the NOT operated second selection signal and the touch signal, and outputs a AND operation result to the first touch electrode line;
a second operator which receives the touch signal, the first selection signal, and the second selection signal, performs NOT operation on the first selection signal, performs AND operation on the NOT operated first selection signal, the second selection signal and the touch signal, and outputs a AND operation result to the second touch electrode line;
a third operator which receives the touch signal, the first selection signal, and the second selection signal, performs NOT operation on the second selection signal, performs AND operation on the NOT operated second selection signal, the first selection signal and the touch signal, and outputs a AND operation result to the third touch electrode line; and
a fourth operator which receives the touch signal, the first selection signal, and the second selection signal, performs AND operation on the first selection signal, the second selection signal and the touch signal, and outputs a AND operation result to the fourth touch electrode line.

11. The display apparatus of claim 1 , wherein each of the plurality of touch electrodes has a mesh shape having one or more openings.

12. The display apparatus of claim 11 , wherein each of the one or more openings is located corresponding to a light emitting region of the pixel.

13. A display apparatus comprising:
a substrate;
a display area defined on the substrate, on which a plurality of pixels are arranged;
a pad area defined on the substrate and on which a plurality of pads are disposed;
a circuit area including a plurality of multiplexer circuits disposed between the display area and the pad area;
a bending area defined on the substrate and disposed between the display area and the pad area;
a touch sensor part including a plurality of touch electrodes disposed at the display area;
a touch wiring connecting the plurality of multiplexer circuits and the plurality of pads;
a first organic film disposed at the bending area;
a first wiring disposed on the first organic film;
a second organic film disposed on the first wiring; and
a second wiring disposed on the second organic film where a contact hole is formed corresponding to at least two points,
wherein the second wiring is connected to the first wiring through the contact hole,
wherein the plurality of pads includes a first pad for supplying a touch signal and a second pad for supplying a display signal, and the touch wiring is connected to the first pad for supplying the touch signal, and
wherein the plurality of multiplexer circuits is disposed on the same substrate as the plurality of pads including the first pad and the second pad.

14. The display apparatus of claim 13 , wherein the second wiring covers a part of an upper portion of the second organic film.

15. The display apparatus of claim 13 , wherein the plurality of touch electrodes is connected to the second wiring.

16. The display apparatus of claim 13 , further comprising:
a cathode layer disposed on the substrate; and
an encapsulation layer disposed on the cathode layer, wherein the touch electrode is disposed on the encapsulation layer.

17. The display apparatus of claim 16 , further comprising a buffer layer disposed on the encapsulation layer, and the touch electrode is disposed on the buffer layer.

18. The display apparatus of claim 13 , further comprising:
a plurality of touch electrode lines connecting the plurality of touch electrodes and the plurality of multiplexer circuits,
wherein the plurality of multiplexer circuits selectively connects a touch electrode line among the plurality of touch electrode lines to the touch wiring.

19. The display apparatus of claim 18 , wherein the touch electrode line is disposed along a side surface of the encapsulation layer in an outer area of the display area.

20. The display apparatus of claim 18 , wherein the multiplexer circuit includes a same metal as the touch electrode line.

21. The display apparatus of claim 18 , wherein the multiplexer circuit comprises:
a first operator which receives a touch signal, a first selection signal, and a second selection signal, performs NOT operations on the

Assignees

• Lg Display Co Ltd

Inventors

• Rhe Ruda
• Jung Jihyun
• Gwon Hyangmyoung
• Lee Jaegyun
• Jo Jungho

Classifications

• G06F2203/04111

  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 title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F2203/04112

  Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material · CPC title

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title