Display Device Integrated with Touch Screen

• US 20140085222A1
• Filed: 12/03/2012
• Published: 03/27/2014
• Est. Priority Date: 09/27/2012
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, TaeHwan, Hwang, SangSoo, Park, YongChan, Park, JinWoo
• Granted Patent: US 9,110,583 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• 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 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures

Abstract

Disclosed is a display device integrated with a touch screen which realizes good design by decreasing a bezel width, and its driving method, wherein the device comprises a plurality of gate and data lines crossing each other on a lower substrate of a display panel; a common electrode formed in each of touch blocks, wherein the plurality of touch blocks are formed by grouping all pixels into units; a plurality of touch drive lines on the lower substrate of the display panel, wherein the touch drive line is provided in the same direction as that of the data line; and a plurality of touch sensing lines on an upper substrate of the display panel, wherein the touch sensing line is formed in the same direction as that of the gate line.

Claims

1. A display device integrated with a touch screen comprising:

a plurality of gate and data lines crossing each other on a lower substrate of a display panel;

a common electrode formed in each of touch blocks, wherein the plurality of touch blocks are formed by grouping all pixels into units;

a plurality of touch drive lines on the lower substrate of the display panel, wherein the touch drive line is provided in the same direction as that of the data line; and

a plurality of touch sensing lines on an upper substrate of the display panel, wherein the touch sensing line is formed in the same direction as that of the gate line.

2. The display device according to claim 1,

wherein a common voltage is supplied to common electrodes of the plurality of touch blocks during a display period;

and

wherein a touch driving signal is supplied to common electrodes of the plurality of touch blocks during a non-display period so that the common electrodes function as touch electrodes.

3. The display device according to claim 1, wherein a line width in each of the touch drive lines is the same as or larger than a line width of the data line.

4. The display device according to claim 1, wherein the plurality of touch drive lines are overlapped with the data line under the condition that an insulating layer is interposed therebetween.

5. The display device according to claim 1, wherein the plurality of touch drive lines are formed on at least one data line among the data lines of red sub-pixel, green sub-pixel and blue sub-pixel constituting one pixel.

6. The display device according to claim 1, wherein the plurality of touch drive lines are formed in the Y-axis direction, and the plurality of touch sensing lines are formed in the X-axis direction.

7. The display device according to claim 1, wherein the first touch drive line among the plurality of touch drive lines is connected with the common electrode of the first touch block among the plurality of touch blocks, and the first touch drive line is electrically insulated from the common electrodes of the other touch blocks except the first touch block.

8. The display device according to claim 1, further comprising:

a first passivation layer for covering a thin film transistor; and

a second passivation layer for covering the touch drive line and a pixel electrode,

wherein the second passivation layer insulates the touch drive line connected with the common electrode of the first touch block from the common electrodes of the other touch blocks except the first touch block.

9. The display device according to claim 1, further comprising:

a touch driver for supplying a touch driving signal to the plurality of touch blocks, and sensing a capacitance in the plurality of touch blocks,

wherein the plurality of touch drive lines and the touch driver are connected in the periphery of display area by the use of flexible printed circuit (FPC).

10. The display device according to claim 1, wherein the plurality of touch drive lines are formed of an opaque metal material, and the plurality of touch sensing lines are formed of a transparent conductive material.