Display device with integrated self-capacitive and in-cell type touch screen

• US 9,218,085 B2
• Filed: 12/30/2013
• Issued: 12/22/2015
• Est. Priority Date: 02/22/2013
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Hwang, Sang Soo, Kim, Tae Hwan
• Primary Examiner(s): Davis, David D
• Application Number:
  US14/144,178
• Publication Number:
  US 20140240279A1
• Time in Patent Office: 722 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

A display device can include a panel configured to include a plurality of electrodes and a display driver IC that applies a common voltage to the plurality of electrodes, a touch IC configured to generate a touch scan signal, and apply the touch scan signal to the display driver IC. Further, the display device can include a plurality of first link lines configured to connect the plurality of electrodes to the display driver IC in a first direction, and a plurality of second link lines respectively connected to the plurality of electrodes to extend in a second direction opposite to the first direction to contact a distal end of the panel. The display driver IC applies the common voltage or the touch scan signal to the plurality of electrodes through the plurality of first link lines according to a driving mode of the panel.

Claims

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

a panel configured to comprise a plurality of electrodes and a display driver IC that applies a common voltage to the plurality of electrodes;

a touch IC configured to generate a touch scan signal, and apply the touch scan signal to the display driver IC;

a plurality of first link lines configured to connect the plurality of electrodes to the display driver IC in a first direction; and

a plurality of second link lines respectively connected to the plurality of electrodes to extend in a second direction opposite to the first direction to contact a distal end of the panel,

wherein the display driver IC applies the common voltage or the touch scan signal to the plurality of electrodes through the plurality of first link lines according to a driving mode of the panel.

2. The display device of claim 1, wherein,

the panel is divided into a display area and a non-display area,

the plurality of electrodes are formed in the display area, and

the display driver IC is disposed in the non-display area.

3. The display device of claim 1, wherein,

when the driving mode of the panel is a display driving mode, the display driver IC applies the common voltage to the plurality of electrodes, and

when the driving mode of the panel is a touch driving mode, the display driver IC applies the touch scan signal to the plurality of electrodes.

4. The display device of claim 3, wherein the display driver IC comprises:

a common voltage generator configured to generate the common voltage;

a sync signal generator configured to generate a sync signal that indicates the display driving mode and the touch driving mode; and

a switching unit configured to connect the common voltage generator to the plurality of electrodes, or connect the touch IC to the plurality of electrodes, according to the sync signal.

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

a touch scan signal generator configured to generate the touch scan signal; and

a touch sensing unit configured to detect a touch input position of the panel according to the touch scan signal.

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

a panel configured to comprise a plurality of electrodes and a display driver IC;

a touch IC configured to generate a touch scan signal, and apply the touch scan signal to the plurality of electrodes;

a plurality of first link lines configured to connect the plurality of electrodes to the touch IC in a first direction; and

a plurality of second link lines respectively connected to the plurality of electrodes to extend in a second direction opposite to the first direction to contact a distal end of the panel,

wherein,

the display driver IC applies the common voltage to the touch IC, and

the touch IC applies the common voltage or the touch scan signal to the plurality of electrodes through the plurality of first link lines according to a driving mode of the panel.

7. The display device of claim 6, wherein,

the panel is divided into a display area and a non-display area,

the plurality of electrodes are formed in the display area, and

the display driver IC is disposed in the non-display area.

8. The display device of claim 6, wherein,

when the driving mode of the panel is a display driving mode, the touch IC applies the common voltage to the plurality of electrodes, and

when the driving mode of the panel is a touch driving mode, the touch IC applies the touch scan signal to the plurality of electrodes.

9. The display device of claim 8, wherein the touch IC comprises:

a touch scan signal generator configured to generate the touch scan signal;

a touch sensing unit configured to detect a touch input position of the panel according to the touch scan signal; and

a switching unit configured to connect the plurality of electrodes to the display driver IC or connect the plurality of electrodes to the touch scan signal generator and the touch sensing unit, according to the driving mode of the panel.