TOUCH SENSOR INTEGRATED DISPLAY DEVICE

• US 20170003786A1
• Filed: 06/30/2015
• Published: 01/05/2017
• Est. Priority Date: 06/30/2015
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: LEE, Myeonsik, YOO, Hajin, KIM, Minsu
• Granted Patent: US 9,841,833 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133357 Planarisation layers
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/13454 Drivers integrated on the active matrix substrate G02F1/136277 takes precedence
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/13629 Multilayer wirings
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• 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 3/044 by capacitive means
• 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: H01L 29/78636 with supplementary region or layer for improving the flatness of the device

Abstract

A touch sensor integrated display device includes a plurality of common electrode blocks that defines a plurality of touch driving channels and a plurality of touch sensing channels. The touch driving channel is formed of a group of common electrode blocks electrically linked via a touch signal line placed under the layer of the common electrode blocks. The source/drain of the circuit TFTs provided in the non-display area is formed of the same metal layer of the touch signal line. The source/drain of the pixel TFTs provided in the display area is formed of a metal layer different from the metal layer of the touch signal line.

Claims

1. A display device, comprising:

a plurality of pixels provided in a display area of a display panel, each of the plurality of pixels having a pixel thin film transistor (TFT) connected to a pixel electrode;

a plurality of common electrode blocks that provides a plurality of touch driving channels and a plurality of touch sensing channels, in which each of the touch driving channels is defined with a group of selective common electrode blocks electrically linked to each other via a touch signal line; and

one or more circuit thin film transistors provided in a non-display area of a display panel, wherein source/drain layer the pixel TFT and source/drain layer of the circuit TFT are formed of a different metal layer.

2. The display device of claim 1, wherein the source/drain layer of the pixel TFT is provided on a first planarization layer and the source/drain layer of the circuit TFT is provided under the first planarization layer.

3. The display device of claim 2, further comprising a second planarization layer covering the source/drain layer of the pixel TFT.

4. The display device of claim 3, wherein the source/drain layer of the circuit TFT is formed of the same metal layer as the touch signal line.

5. The display device of claim 4, further comprising a grid patterned conductive line placed on an upper surface of each of the plurality of common electrode blocks.

6. The display device of claim 5, further comprising a bridge interposed between the first planarization layer and the second planarization layer, wherein the touch signal line is in contact with the bridge through a contact hole in the first planarization layer and the grid patterned conductive line on the common electrode block is in contact with the bridge through a contact hole in the second planarization layer.

7. The display device of claim 5, wherein a vertical line of the grid patterned conductive line is arranged on a data line such that at least some part of the vertical line of the grid patterned conductive line and the data line overlaps one another.

8. The display device of claim 5, wherein a horizontal line of the grid patterned conductive line is arranged on the touch signal line such that at least some part of the horizontal line of the grid patterned conductive line and the data line overlaps one another.

9. The display device of claim 2, wherein the touch signal line for linking the group of selective common electrode blocks for defining the touch driving channel is arranged to bypass the touch sensing channels.

10. The display device of claim 2, wherein at least two touch driving channels are defined with the common electrode blocks arranged in a single row.