Display device having touch panel

• US 8,923,014 B2
• Filed: 08/12/2011
• Issued: 12/30/2014
• Est. Priority Date: 08/19/2010
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Jong-Hyuk, Song, Joong-Lok
• Primary Examiner(s): Hoffberg, Robert J
• Assistant Examiner(s): PATEL, MUKUNDBHAI G
• Application Number:
  US13/209,169
• Publication Number:
  US 20120044662A1
• Time in Patent Office: 1,236 Days
• Field of Search: 361/816, 349/150, 349/12, 349/59, 345173-175, 345/204, 178 1801- 1808
• US Class Current: 361/816
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

A display device having a touch panel which effectively intercepts noise generated from a display panel to prevent the touch panel from malfunctioning. The display device having the touch panel includes a display panel, a touch panel attached to the display panel through an adhesion layer, a noise interception layer over an entire rear surface of the touch panel to prevent electrical noise from the display panel from being introduced into the touch panel, a metal ring pattern on the noise interception layer to surround the edge of the noise interception layer and having lower electrical resistance than the noise interception layer, and a ground terminal electrically connected to the noise interception layer and the metal ring pattern.

Claims

1. A display device, comprising:

a display panel including a color filter substrate, a thin film transistor substrate and a liquid crystal layer formed between the color filter substrate and the thin film transistor substrate;

a touch panel including a lower substrate, a cover substrate and a touch sensor between the lower substrate and the cover substrate, the lower substrate attached to the color filter substrate through an adhesion layer;

a noise interception layer over an entire rear surface of the lower substrate to prevent electrical noise from the display panel from being introduced into the touch panel;

a metal ring pattern on the noise interception layer to surround the edge of the noise interception layer and having lower electrical resistance than the noise interception layer, the metal ring pattern being not in contact with the adhesive layer and disposed outside an area of the adhesive layer and the display panel;

a ground terminal electrically connected to the noise interception layer and the metal ring pattern;

a circuit film to electrically connect the touch sensor to a touch controller to drive the touch sensor; and

a circuit film extension bent from an inner surface of the lower substrate along a side surface of the lower substrate and connected to the ground terminal formed on an outer surface of the lower substrate.

2. The display device according to claim 1, wherein the circuit film extension is configured such that a width of a first part thereof connected to the ground terminal is greater than a width of a second part thereof bent along the side surface of the lower substrate.

3. The display device according to claim 1, wherein the metal ring pattern and the ground terminal are integrally formed in the same metal layer.

4. The display device according to claim 1, wherein the noise interception layer is formed of a transparent conductive layer.

5. The display device according to claim 1, further comprising at least one metal line formed on the noise interception layer and electrically connected to the metal ring pattern.

6. The display device according to claim 5, wherein:

the display device is a liquid crystal display device including a plurality of gate lines and a plurality of data lines respectively arranged in directions perpendicularly to each other to form pixel regions, a plurality of thin film transistors formed at the pixel regions where the respective gate lines and the respective data lines intersect each other, and a black matrix layer formed at regions corresponding to the plurality of gate lines, the plurality of data lines and the plurality of thin film transistors to prevent light leakage; and

the at least one metal line is aligned with the black matrix layer.

7. The display device according to claim 6, wherein the at least one metal line is aligned with the black matrix layer in the gate line direction.

8. The display device according to claim 7, wherein the at least one metal line has a line width of 1 μ

m to 3 μ

m.

9. The display device according to claim 1, wherein the noise interception layer is directly connected to the rear surface of the lower substrate.

10. The display device according to claim 7, wherein the at least one metal line overlaps the black matrix layer relative to a viewpoint from the touch panel.