Liquid crystal display device and method of manufacturing the same

• US 9,098,134 B2
• Filed: 12/26/2012
• Issued: 08/04/2015
• Est. Priority Date: 03/29/2012
• Status: Expired

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Lee, Sun Jung, Song, In Hyuk, Shin, Heesun
• Primary Examiner(s): CHEN, WEN YING PATTY
• Application Number:
  US13/727,271
• Publication Number:
  US 20130257794A1
• Time in Patent Office: 951 Days
• Field of Search: 349/12
• 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 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• 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

Abstract

An LCD device includes a plurality of gate lines and data lines cross-arranged on a lower substrate to define a plurality of pixels, a pixel electrode disposed in each of the pixels, a plurality of common electrode blocks pattern-formed that generate an electric field with the pixel electrode and sensing a touch of a user, a plurality of sensing lines, a plurality of pad parts arranged to be separated from each other at predetermined intervals along a corresponding sensing line, and having a line width thicker than the sensing line, and a contact part disposed between a corresponding pad part and a corresponding common electrode block, and electrically connecting a corresponding sensing line and the common electrode block. When the sensing lines are electrically connected to one of the common electrode blocks, the sensing lines are electrically insulated from the other common electrode blocks.

Claims

1. A liquid crystal display (LCD) device, comprising:

a plurality of gate lines and data lines cross-arranged on a lower substrate to define a plurality of pixels;

a pixel electrode in each of the pixels;

a plurality of common electrode blocks pattern-formed that generate an electric field with the pixel electrode and sensing a touch of a user;

a plurality of sensing lines, wherein when the sensing lines are electrically connected to one of the common electrode blocks, the sensing lines are electrically insulated from the other common electrode blocks;

a plurality of pad parts arranged to be separated from each other at predetermined intervals along a corresponding sensing line, and having a line width thicker than the sensing line; and

a contact part disposed between a corresponding pad part and a corresponding common electrode block, and electrically connecting a corresponding sensing line and the common electrode block,

wherein the contact part is formed to contact at least one or more of a plurality of the pad parts comprised in a corresponding sensing line which is electrically connected to one of the common electrode blocks.

2. The LCD device of claim 1, wherein a pad part disposed in a corresponding sensing line is arranged at a position symmetric with a pad part formed in a sensing line adjacent to the corresponding sensing line.

3. The LCD device of claim 1, wherein each of the sensing lines overlaps a corresponding data line or a corresponding gate line.

4. The LCD device of claim 1, wherein each of the sensing lines is disposed in a direction parallel to a corresponding data line or a direction parallel to a corresponding gate line.

5. The LCD device of claim 1, wherein each of the pad parts has a constant line width irrespective of whether each pad part is electrically connected to the contact part.

6. The LCD device of claim 1, wherein the contact part is disposed in a non-transmissive area, for preventing a reduction in an aperture ratio.

7. The LCD device of claim 1, wherein the common electrode blocks are disposed on the pixel electrode with a second protective layer therebetween, and comprises at least one slit.

8. The LCD device of claim 1, wherein the pixel electrode is disposed on the common electrode block with a second protective layer therebetween, and comprises at least one slit.

9. The LCD device of claim 1, wherein a multiplexer is connected to a distal end of each of the sensing lines.

10. A method of manufacturing a liquid crystal display (LCD) device, comprising:

sequentially forming a gate electrode, a gate dielectric, a semiconductor layer, a source electrode, a drain electrode, and a first protective layer on a lower substrate; and

forming a pixel electrode electrically connected to the drain electrode, a plurality of common electrode blocks pattern-formed for generating an electric field with the pixel electrode and sensing a touch of a user, a plurality of sensing lines, a plurality of pad parts formed to be separated from each other at predetermined intervals along a corresponding sensing line and having a line width thicker than the sensing line, and a contact part formed between a corresponding pad part and a corresponding common electrode block and electrically connecting a corresponding sensing line and the common electrode block, wherein when the sensing lines are electrically connected to one of the common electrode blocks, the sensing lines are electrically insulated from the other common electrode blocks,

wherein the contact part is formed to contact at least one or more of a plurality of the pad parts that are formed in an area overlapping a corresponding common electrode block and a corresponding sensing line are electrically connected.