DISPLAY DEVICE

• US 20170160852A1
• Filed: 09/28/2016
• Published: 06/08/2017
• Est. Priority Date: 12/07/2015
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: AHN, JungEun, JUNG, BoYoung
• Granted Patent: US 10,459,553 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/136295 Materials; Compositions; Manufacture processes
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/123 pixel
• 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 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/04166 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 3/044 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: G06F 3/047 : using sets of wires, e.g. crossed wires
• CPC Class Codes: H10K 50/865 : comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/131 : Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/38 : comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/40 : OLEDs integrated with touch screens
• CPC Class Codes: H10K 59/8792 : comprising light absorbing layers, e.g. black layers

Abstract

A display device is provided. A first electrode is disposed in an area defined by a gate line positioned on a first substrate in a first direction and a data line positioned on the first substrate in a second direction to intersect the gate line. A second electrode is disposed in the area and positioned on the substrate in a different layer from the first electrode. A touch signal line is positioned on the first substrate in a different layer from the data line to be positioned above the data line, the touch signal line being connected to the second electrode.

Claims

1. A display device having a first substrate comprising:

a plurality of gate lines and a plurality of data lines on the first substrate defining a plurality of pixels;

a thin film transistor including a source electrode, a drain electrode and a gate electrode at the pixels;

a first electrode disposed on the pixels;

a second electrode overlapping the first electrode; and

a touch signal line parallel to the data lines, wherein the touch signal line has a width greater than a width of the data lines.

2. The display device according to claim 1, wherein the second electrode functions as a common electrode in a display mode and functions as a touch electrode in a touch mode.

3. The display device according to claim 1, wherein the second electrode has a block-shaped pattern or a pattern including a toothcomb portion.

4. The display device according to claim 1, wherein the first electrode is connected to one of the drain electrode and the source electrode.

5. The display device according to claim 4, wherein the first electrode has a block-shaped pattern or a pattern including a toothcomb portion.

6. The display device according to claim 1, further comprising a first protective layer between the first electrode and the second electrode.

7. The display device according to claim 1, further comprising a second protective layer between the touch signal line and the data lines.

8. The display device according to claim 1, wherein the second electrode is connected to the touch signal line through a contact hole.

9. The display device according to claim 8, wherein the contact hole overlap a part of the gate lines.

10. The display device according to claim 1, wherein the data lines, the touch signal line, opposite edges of the first electrode and opposite edges of the second electrode are parallel to one another.

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

a second substrate opposing the first substrate, the second substrate comprising a plurality of color filters facing the first electrode.

12. The display device according to claim 11, wherein the touch signal line on the first substrate is positioned between a plurality of the color filters on the second substrate.

13. The display device according to claim 12, wherein the data lines on the first substrate is positioned between a plurality of the color filters on the second substrate.

14. The display device according to claim 12, wherein a distance between each two of the plurality of the color filters is larger than the width of the touch signal line or the data lines.

15. The display device according to claim 1, wherein the touch signal line, the data lines and the second electrode overlap a part of the gate lines.

16. A display device having an integrated touchscreen panel on a first substrate, comprising:

a plurality of data lines and gate lines on the first substrate;

a plurality of pixels where the data lines and the gate lines intersect with one another;

a first electrode on the plurality of pixels;

a second electrode vertically overlapping the first electrode, the second electrode functioning as a common electrode in a display mode and a touch electrode in a touch mode;

a touch signal line vertically overlapping and parallel to the data lines, wherein the touch signal line has a width greater than a width of the data lines, and a common voltage and a touch driving signal are supplied through the touch signal line in the display mode and the touch mode, respectively.

17. The display device according to claim 16, wherein the touch signal line in each pixel acts as a black matrix.

18. The display device according to claim 16, wherein the second electrode has one of a block-shaped pattern and a toothcomb pattern.