Display device integrated with touch screen

• US 9,110,583 B2
• Filed: 12/03/2012
• Issued: 08/18/2015
• Est. Priority Date: 09/27/2012
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Park, YongChan, Kim, TaeHwan, Hwang, SangSoo, Park, JinWoo
• Primary Examiner(s): Eisen, Alexander
• Assistant Examiner(s): TESHOME, KEBEDE T
• Application Number:
  US13/692,048
• Publication Number:
  US 20140085222A1
• Time in Patent Office: 988 Days
• Field of Search: 345/156, 345/173, 345/176
• US Class Current: 1/1
• 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, the plurality of touch blocks being formed by grouping all pixels into units;

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

a plurality of touch sensing lines on an upper substrate of the display panel, the touch sensing line being formed in the same direction as that of the gate line; and

a plurality of contact portions respectively connecting each touch drive line with the common electrode,

wherein the contact portion is formed directly in an overlapping region between the gate and the data line, and

wherein a length of the touch drive lines is different for each touch block in the direction of the data lines.

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

a touch driving signal is supplied to common electrodes of the plurality of touch blocks during a non-display period such 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 a red sub-pixel, a green sub-pixel, and a blue sub-pixel constituting one pixel.

6. The display device according to claim 1, wherein:

the plurality of touch drive lines are formed in a Y-axis direction; and

the plurality of touch sensing lines are formed in an 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 covering a thin film transistor; and

a second passivation layer 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 configured to;

supply a touch driving signal to the plurality of touch blocks; and

sense 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 a flexible printed circuit (FPC).

10. The display device according to claim 1, wherein:

the plurality of touch drive lines comprise an opaque metal material; and

the plurality of touch sensing lines comprise a transparent conductive material.

11. The display device according to claim 1, wherein each of the touch blocks is connected with at least two touch drive lines.

12. 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, the plurality of touch blocks being formed by grouping all pixels into units;

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

a plurality of touch sensing lines on an upper substrate of the display panel, the touch sensing line being formed in the same direction as that of the gate line; and

a plurality of contact portions respectively connecting each touch drive line with the common electrode,

wherein, a plurality of first touch drive lines among the plurality of touch drive lines are disposed on the data lines of red sub-pixel,

wherein a plurality of second touch drive lines among the plurality of touch drive lines are disposed on the data lines of green sub-pixel, and

wherein none of the plurality of touch drive lines is disposed on the data lines of blue sub-pixel.

13. The display device according to claim 12, wherein the contact portion is formed directly in an overlapping region between the gate and the data line.

14. The display device according to claim 12, wherein a length of the touch drive lines is different for each touch block in the direction of the data lines.

15. The display device according to claim 12, 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.

16. The display device according to claim 12, wherein the plurality of touch drive lines are overlapped with the data line underneath, and with an insulating layer interposed therebetween.

17. The display device according to claim 12, wherein:

the plurality of touch drive lines is formed in a Y-axis direction; and

the plurality of touch sensing lines is formed in an X-axis direction.

18. The display device according to claim 12, 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 for the first touch block.

19. The display device according to claim 12, further comprising:

a first passivation layer covering a thin film transistor; and

a second passivation layer 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.

20. The display device according to claim 12, further comprising a touch driver configured to:

supply a touch driving signal to the plurality of touch blocks; and

sense 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 a flexible printed circuit (FPC).