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

• US 9,536,913 B2
• Filed: 03/17/2015
• Issued: 01/03/2017
• Est. Priority Date: 06/24/2014
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Lee, Jinbok, Kim, MinJoo, Beak, JungSun
• Primary Examiner(s): Schoenholtz, Joseph
• Application Number:
  US14/660,525
• Publication Number:
  US 20150372028A1
• Time in Patent Office: 658 Days
• Field of Search: None
• 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 method for fabricating signal lines of a display device integrated with a touch screen panel, the method comprising:

forming a thin film transistor on a substrate;

sequentially forming a thin film transistor protective layer covering the thin film transistor, a first electrode layer and a conductive metal layer;

etching the first electrode layer, the conductive metal layer and the thin film transistor protective layer by using a first photo-mask to form a first contact hole, through which a source electrode or a drain electrode is exposed, in the first electrode layer and the thin film transistor protective layer, and forming a first electrode and a touch signal line;

coating a first electrode protective layer;

coating photoresist by using a second photo-mask and forming a first electrode and a first touch connection pattern separated from the first electrode; and

forming a second electrode and a second touch connection pattern made of the same material as that of the second electrode to be connected with the second electrode by using a third photo-mask, and at the same time, forming a first connection pattern, which connects one of either the exposed source electrode or the drain electrode with the first electrode through the first contact hole.

2. The method of claim 1, wherein the forming the first electrode and the touch signal line further comprises forming a second connection pattern that is made of the same material as that of the touch signal line to overlap the first electrode.

3. The method of claim 1, wherein the forming the first connection pattern further comprises forming the first connection pattern on the second connection pattern to indirectly connect the first electrode with one of the exposed source electrode or the drain electrode.

4. The method of claim 1, wherein the forming the second touch connection pattern further comprises forming the second touch connection pattern on the touch signal line through a second contact hole which is formed in the first electrode protective layer.

5. The method of claim 4, wherein the width of the touch signal line is narrower than the first touch connection pattern, the first electrode protective layer is positioned at an 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.

6. The method of claim 1, further comprising:

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

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