Display device integrated with touch screen panel and method for fabricating the same

• US 9,046,955 B1
• Filed: 11/13/2014
• Issued: 06/02/2015
• Est. Priority Date: 06/24/2014
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Beak, JungSun, Lee, Jinbok, Kim, MinJoo
• Primary Examiner(s): PATEL, PREMAL R
• Application Number:
  US14/540,528
• Time in Patent Office: 201 Days
• Field of Search: 345173-178, 178 1801- 1809
• US Class Current: 1/1
• 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 1/13458 Terminal pads
• 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 1/136236 using a grey or half tone lithographic process
• 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 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/1255 integrated with passive devices, e.g. auxiliary capacitors
• CPC Class Codes: H01L 27/1288 employing particular masking sequences or specially adapted masks, e.g. half-tone mask

Abstract

Disclosed is a display device integrated with a touch screen panel and a method for fabricating the same. The display includes: a TFT positioned at each pixel region; a first electrode spaced from one of a source electrode or a drain electrode of the TFT; a second electrode facing the first electrode; a TFT protective layer positioned on the TFT and has a first contact hole; a touch signal line positioned between a first touch connection pattern, which is made of the same material as the first electrode, and a second touch connection pattern made of the same material as the second electrode, and transfers a touch driving signal to the second touch connection pattern; a first connection pattern made of the same material as the second electrode; and a first electrode protective layer positioned on the first electrode and the touch signal line.

Claims

1. A display device comprising:

a gate line positioned in a first direction on a substrate to transfer a gate signal;

a data line positioned in a second direction on the substrate to transfer a data signal;

a thin film transistor positioned at each pixel defined by a crossing of the gate line and the data line;

a first electrode spaced from one of a source electrode or a drain electrode of the thin film transistor;

a second electrode facing the first electrode;

a thin film transistor protective layer positioned on the thin film transistor and has a first contact hole formed therein;

a touch signal line positioned between a first touch connection pattern, which is made of a same material as that of the first electrode to be separated from the first electrode, and a second touch connection pattern, which is made of a same material as that of the second electrode to be connected with the second electrode, and transfers a touch driving signal to the second touch connection pattern;

a first connection pattern made of the same material as that of the second electrode and connects the source electrode or the drain electrode with the first electrode through the first contact hole; and

a first electrode protective layer positioned on the first electrode and the touch signal line.

2. The display device of claim 1, further comprising a second connection pattern made of the same material as that of the touch signal line to be positioned between the first connection pattern and the first electrode.

3. The display device of claim 1, wherein the second touch connection pattern is positioned on the touch signal line through a second contact hole which is formed in the first electrode protective layer.

4. The display device of claim 3, wherein the width of the touch signal line is narrower than the first touch connection pattern, the first electrode protective layer is positioned at the edge of the width of the touch signal line, and the second contact hole is positioned in the first electrode protective layer to expose the touch signal line.

5. The display device of claim 1, further comprising:

a data pad connection portion that is made of the same material as that of the second electrode to be positioned through a third contact hole in the first electrode protective layer; and

a gate pad connection portion that is made of the same material as that of the second electrode to be positioned through a fourth contact hole in the first electrode protective layer.

6. A display device comprising:

a display panel that includes;

a thin film transistor positioned at each of N×

P pixels defined by crossings of gate lines, which are positioned in a first direction on a substrate to transfer gate signals, and data lines, which are positioned in a second direction on the substrate to transfer data signals, wherein in N and P are integers,

a first electrode that is spaced from one of source electrode or drain electrode of the thin film transistor,

a second electrode that faces the first electrode and provide a same signal to all of the N×

P pixels,

a thin film transistor protective layer positioned on the thin film transistor and has a first contact hole formed therein,

a touch signal line positioned between a first touch connection pattern, which is made of the same material as that of the first electrode to be separated from the first electrode, and a second touch connection pattern, which is made of the same material as that of the second electrode to be connected with the second electrode, and transfers a touch driving signal to the second touch connection pattern,

a first connection pattern that is made of the same material as that of the second electrode and connects one of the source electrode and the drain electrode with the first electrode through the first contact hole, and

a first electrode protective layer that is positioned on the first electrode and the touch signal line;

a touch integrated circuit that applies the touch driving signal to all or some of a plurality of the second electrodes when the display panel operates in a touch driving mode;

a data driving unit that supplies a data voltage to a plurality of the data lines when the display panel operates in a display driving mode; and

a gate driving unit that supplies scan signals to a plurality of the gate lines in sequence when the display panel operates in the display driving mode.

7. The display device of claim 6, further comprising a second connection pattern that is made of the same material as that of the touch signal line to be positioned between the first connection pattern and the first electrode of the display panel.

8. The display device of claim 6, wherein the second touch connection pattern of the display panel is positioned on the touch signal line through a second contact hole which is formed in the first electrode protective layer.

9. The display device of claim 8, wherein the width of the touch signal line of the display panel is narrower than the first touch connection pattern, the first electrode protective layer is positioned at the edge of the width of the touch signal line, and the second contact hole is positioned in the first electrode protective layer to expose the touch signal line.