Touch sensor integrated display device

• US 9,250,735 B2
• Filed: 12/27/2011
• Issued: 02/02/2016
• Est. Priority Date: 02/25/2011
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Cheolse, Lee, Buyeol, Lee, Sunjung, Hwang, Sangsoo, Woo, Yoonhwan, Han, Manhyeop
• Primary Examiner(s): Mummalaneni, Nalini
• Application Number:
  US13/337,390
• Publication Number:
  US 20120218199A1
• Time in Patent Office: 1,498 Days
• Field of Search: 345/173, 345/174, 345/87, 200/600, 349/12, 349/139
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A touch sensor integrated display device is provided comprising gate lines and data lines formed on a substrate to be intersected with each other, a plurality of pixel electrodes formed at intersections between the gate lines and the data lines, and a common electrode formed to overlap the plurality of pixel electrodes through an insulating film disposed between the common electrode and the plurality of pixel electrodes, wherein the common electrode includes at least two touch electrodes, each of which is connected to at least one of signal lines arranged in one of a first direction and a second direction crossing the first direction.

Claims

1. A touch sensor integrated display device comprising:

gate lines on a substrate;

signal lines formed on the substrate to be spaced apart from the gate lines and parallel to the gate lines;

a gate insulating film on a surface of the substrate, wherein the signal lines are between the gate insulating film and the surface of the substrate;

data lines on the gate insulating film, wherein the data lines cross the gate lines;

a thin film transistor (TFT) on the gate insulating film, the thin film transistor having a source electrode connected with a data line of the data lines;

a pixel electrode on the gate insulating film, wherein the pixel electrode is connected with a drain electrode of the TFT;

an interlayer insulating film on the gate insulating film on which the data lines, the TFT, and the pixel electrode have been formed, wherein the interlayer insulating film is formed at an intersection of a gate line of the gate lines and a data line of the data lines; and

a common electrode on the interlayer insulating film and connected with the signal lines through contact holes, wherein the contact holes penetrate both the gate insulating film and the interlayer insulating film,

wherein the common electrode includes two or more touch electrodes, and each of the touch electrodes is connected with the signal lines, and

wherein the touch sensor integrated display device is driven in touch driving and display driving by a time division process, and during display driving, the same common voltage is supplied to the two or more touch electrodes through the signal lines, and during the touch driving, a touch driving voltage is sequentially supplied to the touch electrodes,

the touch sensor integrated display device configured to drive the signal lines and touch electrodes in a self-capacitance scheme, wherein all of the signal lines connected to the touch electrodes are arranged in a same direction.

2. The touch sensor integrated display device of claim 1, wherein each of the touch electrodes has a size corresponding to a size of two or more of the pixel electrodes.

3. The touch sensor integrated display device of claim 1, wherein the touch sensor integrated display device is driven by the time division process such that the touch driving is turned off during the display driving, and the display driving is turned off during the touch driving.

4. The touch sensor integrated display device of claim 1, further comprising:

a power supply circuit configured to sequentially supply the touch driving voltage to the touch electrodes via the signal lines during the touch driving; and

a touch recognition circuit configured to receive the touch driving voltage from the signal lines during the touch driving and determine touch based on differences between stored capacitance and measured capacitance of each of the touch electrodes based on the received touch driving voltage,

wherein each of the touch of electrodes is connected to a different one of the signal lines.

5. A touch sensor integrated display device comprising:

gate lines on a substrate;

a gate insulating film on a surface of the substrate and the gate lines;

data lines on the gate insulating film, the data lines intersecting the gate lines;

signal lines on the gate insulating film, the signal lines arranged in only one direction intersecting the gate lines and spaced apart from and paralleled to the data lines;

thin film transistors on the gate insulating film, the thin film transistors each including a source electrode connected to the data lines;

pixel electrodes on the gate insulating film, wherein the pixel electrodes are connected to a drain electrode of the thin film transistors and formed at intersections between the gate lines and the data lines;

an interlayer insulating film on the gate insulating film, the data lines, the signal lines, the thin film transistors, and the pixel electrodes; and

a common electrode on the interlayer insulating film, wherein the common electrode is connected to the signal lines through contact holes formed in the interlayer insulating film;

wherein the common electrode includes at least two touch electrodes which are connected to the signal lines, respectively, and

wherein the touch sensor integrated display device is driven in touch driving and display driving by a time division process, and during the display driving, the same common voltage is supplied to the two or more touch electrodes through the signal lines, and during the touch driving, a touch driving voltage is sequentially supplied to the touch electrodes,

the touch sensor integrated display device configured to drive the signal lines and touch electrodes in a self-capacitance scheme,

wherein all of the signal lines connected to the touch electrodes are arranged in a same direction, and

wherein the pixel electrodes directly contact the gate insulating film.

6. The touch sensor integrated display device of claim 5, wherein each of the touch electrodes has a size corresponding to a size of two or more of the pixel electrodes.

7. The touch sensor integrated display device of claim 5, wherein the touch sensor integrated display device is driven by the time division process such that the touch driving is turned off during the display driving, and the display driving is turned off during the touch driving.

8. A touch sensor integrated display device comprising:

gate lines and data lines on a substrate, wherein the gate lines and the data lines intersect each other and form pixel areas at intersections of the gate and data lines;

a gate insulating film on a surface of the substrate and the gate lines;

a plurality of pixel electrodes on the pixel areas;

a common electrode overlapping the plurality of pixel electrodes through an interlayer insulating film disposed between the common electrode and the pixel electrodes, wherein the common electrode includes at least two touch electrodes; and

at least one signal line connected to each of the touch electrodes, arranged in only one direction and overlapping the data lines,

wherein the data lines are on the gate insulating film and between the gate insulating film and the interlayer insulating film,

wherein the signal lines are on the interlayer insulating film, and the interlayer insulating film is between the data lines and the signal lines, and

wherein the touch sensor integrated display device is driven in touch driving and display driving by a time division process, and during the display driving, the same common voltage is supplied to the two or more touch electrodes through the signal lines, and during the touch driving, a touch driving voltage is sequentially supplied to the touch electrodes,

the touch sensor integrated display device configured to drive the signal lines and touch electrodes in a self-capacitance scheme, wherein all of the signal lines connected to the touch electrodes are arranged in a same direction,

wherein the pixel electrodes directly contact the gate insulating film.

9. The touch sensor integrated display device of claim 8, wherein the at least one signal line is formed to be parallel to the data lines.

10. The touch sensor integrated display device of claim 9, wherein the at least one signal line substantially overlaps an entirety of a respective one of the data lines.

11. The touch sensor integrated display device of claim 8, wherein the at least one signal line is disposed on areas other than an overlapping area between the pixel electrodes and the common electrode.

12. The touch sensor integrated display device of claim 8, wherein each of the touch electrodes has a size corresponding to a size of two or more of the pixel electrodes.

13. The touch sensor integrated display device of claim 8, wherein the touch sensor integrated display device is driven by the time division process such that the touch driving is turned off during the display driving, and the display driving is turned off during the touch driving.

14. A touch sensor integrated display device, comprising:

gate lines on a substrate;

a gate insulating film on a surface of the substrate and the gate lines;

data lines on the gate insulating film, the data lines intersecting the gate lines;

thin film transistors on the gate insulating film, the thin film transistors each including a source electrode connected to the data lines;

pixel electrodes on the gate insulating film, wherein the pixel electrodes are connected to a drain electrode of the thin film transistors and formed on pixel areas defined at intersections between the gate lines and the data lines;

an interlayer insulating film on the gate insulating film, the data lines, signal lines, the thin film transistors, and the pixel electrodes;

the signal lines on the interlayer insulating film, the signal lines arranged in only one direction and overlapping the data lines;

a passivation film on the interlayer insulating film and the signal lines; and

a common electrode on the passivation film, wherein the common electrode is connected to the signal lines through via holes formed in the passivation film; and

wherein the common electrode includes at least two touch electrodes which are connected to the signal lines, respectively, and

wherein the touch sensor integrated display device is driven in touch driving and display driving by a time division process, and during the display driving, the same common voltage is supplied to the two or more touch electrodes through the signal lines, and during the touch driving, a touch driving voltage is sequentially supplied to the touch electrodes,

the touch sensor integrated display device configured to drive the signal lines and touch electrodes in a self-capacitance scheme, wherein all of the signal lines connected to the touch electrodes are arranged in a same direction,

wherein the pixel electrodes directly contact the gate insulating film.

15. The touch sensor integrated display device of claim 14, wherein the signal lines are formed to be parallel to the data lines.

16. The touch sensor integrated display device of claim 14, wherein the signal lines are disposed on areas other than an overlaying area between the pixel electrodes and the common electrode.

17. The touch sensor integrated display device of claim 14, wherein each of the touch electrodes has a size corresponding to a size of two or more of the pixel electrodes.

18. The touch sensor integrated display device of claim 14, wherein the touch sensor integrated display device is driven by the time division process such that the touch driving is turned off during the display driving, and the display driving is turned off during the touch driving.

19. A touch sensor integrated display device comprising:

gate lines and data lines formed to cross each other on a substrate;

a plurality of pixel electrodes at intersections of the gate lines and the data lines;

a common electrode formed to overlap the plurality of pixel electrodes, with an insulating film interposed between the common electrode and the plurality of pixel electrodes;

two or more touch electrodes on a same plane and forming the common electrode, each of the touch electrodes having a size corresponding to a size of two or more of the pixel electrodes,

wherein each of the touch electrodes is connected with at least one of signal lines,

the signal lines overlap and are parallel to the respective data lines, and

the signal lines are disposed on areas other than overlapping areas between the pixel electrodes and the common electrode and arranged in only one direction,

the touch sensor integrated display device configured to drive the signal lines and touch electrodes in a self-capacitance scheme, wherein all of the signal lines connected to the touch electrodes are arranged in a same direction,

wherein;

the signal lines are formed on the insulating film, and are disposed on areas other than overlapping areas between the pixel electrodes and the common electrode,

a passivation film is formed between the insulating film and the common electrode, and

each of the touch electrodes forming the common electrode is connected with at least one of the signal lines through a contact hole penetrating the passivation film.

20. The touch sensor integrated display device of claim 19, wherein each of the touch electrodes is connected to a different one of the signal lines.