Display device integrated with touch screen

• US 9,952,694 B2
• Filed: 10/29/2013
• Issued: 04/24/2018
• Est. Priority Date: 11/13/2012
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Tae Hwan
• Primary Examiner(s): Boddie, William
• Assistant Examiner(s): SCHNIREL, ANDREW B
• Application Number:
  US14/065,693
• Publication Number:
  US 20140132534A1
• Time in Patent Office: 1,638 Days
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

Disclosed is a display device integrated with touch screen. The display device has a reduced bezel and an enhanced aesthetic design. Left and right bezels of a panel are reduced, thus increasing an aesthetic design. A driving circuit that generates the touch driving signal is built into the panel, thus decreasing the size of the touch IC and the manufacturing cost.

Claims

1. A display device integrated with touch screen, the display device comprising:

a touch screen panel configured to include a plurality of touch driving electrodes, each comprising a plurality of sub driving electrodes that are electrically connected to each other to configure one touch driving electrode and being disposed in parallel and in a gate line direction of the panel, and a plurality of touch sensing electrodes that are each disposed between a plurality of adjacent sub driving electrodes and are formed in parallel and in a data line direction of the panel;

a touch signal driver provided in a first inactive area at one side of the panel, and configured to supply a touch driving signal or a common voltage to the plurality of touch driving electrodes according to a driving mode;

a display driver IC provided in a second inactive area at another side of the panel opposite the one side of the panel, and configured to receive a plurality of touch sensing signals from the plurality of touch sensing electrodes and to supply the common voltage to the touch signal driver and the plurality of touch sensing electrodes according to the driving mode;

a touch sensing circuit configured to determine whether there is a touch, on a basis of the plurality of touch sensing signals;

a plurality of sensing electrode lines that extend from the respective touch sensing electrodes in the data line direction;

a plurality of common voltage lines configured to supply the common voltage, supplied by the display driver IC, to the touch signal driver;

a plurality of common lines electrically connected to at least a corresponding one of the touch driving electrodes; and

a plurality of driving electrode lines, at least one of the driving electrode lines including a first electrode to connect to a corresponding one of the sub driving electrodes of the corresponding one of the touch driving electrodes and a second electrode to connect to at least a corresponding one of the common lines such that the corresponding one of the touch driving electrodes electrically connects to the corresponding one of the common lines,

wherein the display driver IC is configured to generate a reference voltage and apply the reference voltage to the plurality of touch sensing electrodes according to the driving mode to sense a touch,

wherein the plurality of sensing electrode lines are connected to the display driver IC in the second inactive area of the panel without overlapping with the plurality of common lines,

wherein one of the common voltage lines extends from the second inactive area to the first inactive area through a third inactive area without overlapping with the common lines and the sensing electrode lines, and another of the common voltage lines extends from the second inactive area to the first inactive area through a fourth inactive area of the panel without overlapping with the common lines and the sensing electrode lines, the one and the another of the common voltage lines connecting the display driver IC to the touch signal driver,

wherein each of the plurality of driving electrode lines extends from the corresponding one of the common lines in parallel with the data line direction without overlapping with the touch sensing electrodes, and overlaps with the corresponding one of the touch driving electrodes, and

wherein each of the common lines is disposed in the first inactive area, and is connected to the touch signal driver and to at least a corresponding one of the driving electrode lines.

2. The display device of claim 1, wherein each of the plurality of driving electrode lines is electrically connected to the touch signal driver in the first inactive area of the panel through the corresponding one of the common lines.

3. The display device of claim 2, wherein each of the plurality of driving electrode lines is formed of a metal layer connected to the corresponding one of the sub driving electrodes through a contact hole in an active area of the panel, and is formed to overlap a corresponding data line with an insulating layer therebetween.

4. The display device of claim 1, wherein,

each of the plurality of touch driving electrodes comprises a plurality of block-type common electrodes formed to overlap a plurality of unit pixel areas, and

each of the plurality of touch sensing electrodes comprises one block-type common electrode formed to overlap a plurality of unit pixel areas.

5. The display device of claim 1, wherein the display driver IC further comprises:

a common voltage generator configured to generate the common voltage; and

a switching circuit configured to connect the plurality of touch sensing electrodes through the plurality of sensing electrode lines to the common voltage generator or to the touch sensing circuit according to a sync signal indicating the driving mode.

6. The display device of claim 5, wherein the switching circuit comprises a plurality of switches respectively connected to the plurality of touch sensing electrodes through the respective sensing electrode lines, the plurality of switches being connected to the plurality of touch sensing electrodes in one-to-one correspondence relationship.

7. The display device of claim 5, wherein,

when the sync signal is a first sync signal indicating a display driving mode of the panel, the switching circuit connects the plurality of touch sensing electrodes to the common voltage generator, and

when the sync signal is a second sync signal indicating a touch driving mode of the panel, the switching circuit connects the plurality of touch sensing electrodes to a receiver of the touch signal driver.

8. The display device of claim 7, wherein the display driver IC further comprises a sync signal generator configured to generate the sync signal.

9. The display device of claim 1, further comprising a plurality of dummy electrodes formed in parallel between the plurality of touch sensing electrodes,

wherein the display driver IC comprises a reference voltage generator configured to supply the common voltage or the reference voltage to the plurality of dummy electrodes according to the driving mode.

10. The display of claim 1, wherein the corresponding one of the common lines is configured to transmit the touch signal or the common voltage from the touch signal driver to only the corresponding one of the touch driving electrodes.

11. The display device of claim 9, wherein,

when the sync signal is a first sync signal indicating a display driving mode of the panel, the common voltage is supplied the dummy electrode, and

when the sync signal is a second sync signal indicating a touch driving mode of the panel, the reference voltage is supplied to the dummy electrode.

12. The display device of claim 3, wherein each of the plurality of driving electrode lines has the one end at the contact hole through which the corresponding sub driving electrode and the driving electrode line are connected to each other.

13. The display device of claim 1, wherein each of the plurality of driving electrode lines is formed between the corresponding one of the common lines and a position connected to the sub driving electrode.

14. The display device of claim 1, wherein driving electrode lines respectively connected to the plurality of sub driving electrodes configuring the one touch driving electrode are formed of the same length to each other.

15. The display device of claim 9, wherein the plurality of dummy electrodes are connected to the display driver IC in the second inactive area of the panel respectively through a plurality of dummy electrode lines extending to the second inactive area.

16. The display device of claim 1, wherein the touch screen panel has an active area, and the first and the second inactive areas are disposed adjacent opposite sides of the active area so that the active area is disposed between the first and the second inactive areas, and

wherein the touch sensing circuit s disposed in or connected to the second inactive area of the panel.

19. The display device of claim 1, wherein the touch signal driver is configured to receive a sync signal indicating the driving mode, and to supply the touch driving signal or the common voltage to the touch driving electrodes based on the sync signal.

20. The display device of claim 1, wherein the touch screen panel has an active area between the first and the second inactive areas, and

wherein each of the common lines is disposed in the first inactive area between the touch signal driver and the active area, and extends in parallel with the gate line direction of the panel.

17. A display device integrated with touch screen, the display device comprising:

a touch screen panel configured to include a plurality of touch driving electrodes, each comprising a plurality of sub driving electrodes that are electrically connected to each other to configure one touch driving electrode and being disposed in parallel and in a gate line direction of the panel, and a plurality of touch sensing electrodes that are each disposed between a plurality of adjacent sub driving electrodes and are formed in parallel and in a data line direction of the panel;

a touch signal driver provided in a first inactive area at one side of the panel, and configured to supply a touch driving signal or a common voltage to the plurality of touch driving electrodes according to a driving mode;

a display driver IC provided in a second inactive area at another side of the panel opposite the one side of the panel, and configured to receive a plurality of touch sensing signals from the plurality of touch sensing electrodes and to supply the common voltage to the touch signal driver and the plurality of touch sensing electrodes according to the driving mode;

a touch sensing circuit configured to determine whether there is a touch, on a basis of the plurality of touch sensing signals;

a plurality of sensing electrode lines that extend from the respective touch sensing electrodes in the data line direction;

a plurality of common voltage lines configured to supply the common voltage, supplied by the display driver IC, to the touch signal driver;

a plurality of common lines electrically connected to at least a corresponding one of the touch driving electrodes; and

a plurality of driving electrode lines, at least one of the driving electrode lines including a first electrode to connect to a corresponding one of the sub driving electrodes of the corresponding one of the touch driving electrodes and a second electrode to connect to at least a corresponding one of the common lines such that the corresponding one of the touch driving electrodes electrically connects to the corresponding one of the common lines,

wherein the display driver IC is configured to generate a reference voltage and apply the reference voltage to the plurality of touch sensing electrodes according to the driving mode to sense a touch,

wherein the touch sensing circuit is disposed outside the panel and is connected to the display driver IC in the second inactive area through a flexible printed circuit,

wherein the plurality of sensing electrode lines are connected to the display driver IC in the second inactive area of the panel without overlapping with the plurality of common lines,

wherein one of the common voltage lines extends from the second inactive area to the first inactive area through a third inactive area without overlapping with the common lines and the sensing electrode lines, and another of the common voltage lines extends from the second inactive area to the first inactive area through a fourth inactive area of the panel without overlapping with the common lines and the sensing electrode lines, the one and the another of the common voltage lines connecting the display driver IC to the touch signal driver,

wherein each of the plurality of driving electrode lines extends from the corresponding one of the common lines in parallel with the data line direction without overlapping with the touch sensing electrodes, and overlaps with the corresponding one of the touch driving electrodes, and

wherein each of the common lines is disposed in the first inactive area, and is connected to the touch signal driver and to at least a corresponding one of the driving electrode lines.

18. A display device integrated with touch screen, the display device comprising:

a touch screen panel configured to include a plurality of touch driving electrodes, each comprising a plurality of sub driving electrodes that are electrically connected to each other to configure one touch driving electrode and being disposed in parallel and in a gate line direction of the panel, and a plurality of touch sensing electrodes that are each disposed between a plurality of adjacent sub driving electrodes and are formed in parallel and in a data line direction of the panel;

a touch signal driver provided in a first inactive area at one side of the panel, and configured to supply a touch driving signal or a common voltage to the plurality of touch driving electrodes according to a driving mode;

a display driver IC provided in or connected to a second inactive area at another side of the panel opposite the one side of the panel, and configured to receive a plurality of touch sensing signals from the plurality of touch sensing electrodes and to supply the common voltage to the touch signal driver and the plurality of touch sensing electrodes according to the driving mode;

a touch sensing circuit configured to determine whether there is a touch, on a basis of the plurality of touch sensing signals;

a plurality of sensing electrode lines that extend from the respective touch sensing electrodes in the data line direction;

a plurality of common voltage lines configured to supply the common voltage, supplied by the display driver IC, to the touch signal driver;

a plurality of common lines electrically connected to at least a corresponding one of the touch driving electrodes; and

a plurality of driving electrode lines, at least one of the driving electrode lines including a first electrode to connect to a corresponding one of the sub driving electrodes of the corresponding one of the touch driving electrodes and a second electrode to connect to at least a corresponding one of the common lines such that the corresponding one of the touch driving electrodes electrically connects to the corresponding one of the common lines,

wherein the display driver IC is configured to generate a reference voltage and apply the reference voltage to the plurality of touch sensing electrodes according to the driving mode to sense a touch,

wherein at least one of the driving electrode lines overlaps with a sub driving electrode adjacent to the corresponding one of the sub driving electrodes in the data line direction without being electrically connected to the adjacent sub driving electrode,

wherein the plurality of sensing electrode lines are connected to the display driver IC in the second inactive area of the panel without overlapping with the plurality of common lines,

wherein one of the common voltage lines extends from the second inactive area to the first inactive area through a third inactive area without overlapping with the common lines and the sensing electrode lines, and another of the common voltage lines extends from the second inactive area to the first inactive area through a fourth inactive area of the panel without overlapping with the common lines and the sensing electrode lines, the one and the another of the common voltage lines connecting the display driver IC to the touch signal driver,

wherein each of the plurality of driving electrode lines extends from the corresponding one of the common lines in parallel with the data line direction without overlapping with the touch sensing electrodes, and overlaps with the corresponding one of the touch driving electrodes, and

wherein each of the common lines is disposed in the first inactive area, and is connected to the touch signal driver and to at least a corresponding one of the driving electrode lines.