Display Device Integrated with Touch Screen

• US 20140132534A1
• Filed: 10/29/2013
• Published: 05/15/2014
• 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
• Granted Patent: US 9,952,694 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• 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 configured to include a plurality of touch driving electrodes, which each comprise a plurality of sub driving electrodes that are electrically connected to each other in an inactive area of a panel to configure one touch driving electrode and are formed 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 an upper inactive area 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 of the panel;

a display driver IC provided in an outside or lower inactive area of the panel, and configured to receive a plurality of touch sensing signals from the plurality of touch sensing electrodes and generate the common voltage to supply the common voltage to a transferor of the touch signal driver and the plurality of touch sensing electrodes; and

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

2. The display device of claim 1, further comprising a plurality of common lines formed in the gate line direction in the upper inactive area of the panel, and configured to electrically connect the plurality of sub driving electrodes configuring the one touch driving electrode.

3. The display device of claim 1, further comprising a plurality of common voltage lines formed in each of left and right inactive areas of the panel, and configured to supply the common voltage, generated by the display driver IC, to the touch signal driver.

4. The display device of claim 1, further comprising a plurality of driving electrode lines that extend from the respective sub driving electrodes in the data line direction, the plurality of driving electrode lines being connected to the touch signal driver.

5. The display device of claim 4, wherein each of the plurality of driving electrode lines is formed of a metal layer connected to a corresponding sub driving electrode through a contact hole in an active area of the panel, and formed to overlap a corresponding data line with an insulating layer therebetween.

6. The display device of claim 1, further comprising a plurality of sensing electrode lines that extend from the respective touch sensing electrodes in the data line direction, the plurality of sensing electrode lines being connected to the display driver IC.

7. 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.

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

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

a switching un configured to connect the plurality of touch sensing electrodes to the common voltage generator or the touch sensing unit according to a sync signal indicating the driving mode.

9. The display device of claim 8, wherein the switching unit comprises a plurality of switches respectively connected to the plurality of touch sensing electrodes, the plurality of switches being connected to the plurality of touch sensing electrodes in one-to-one correspondence relationship.

10. The display device of claim 8, wherein,

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

11. The display device of claim 10, wherein the display driver IC further comprises a sync signal generator configured to generate the sync signal.

12. The display device of claim 8, wherein the display driver IC further comprises a reference voltage generator configured to generate a reference voltage used to sense a touch, the reference voltage generator supplying the reference voltage to the plurality of touch sensing electrodes according to the sync signal indicating the driving mode.

13. The display device of claim 12, further comprising a plurality of dummy electrodes formed in parallel between the plurality of touch sensing electrodes,

wherein the reference voltage generator supplies the common voltage or the reference voltage to the plurality of dummy electrodes according to the sync signal indicating the driving mode.