Touch Display Device

• US 20110169783A1
• Filed: 12/30/2010
• Published: 07/14/2011
• Est. Priority Date: 01/08/2010
• Status: Active Grant

• Current Assignee: Wintek Corporation
• Original Assignee: Wintek Corporation
• Inventors: Jian, Ming-Sin, Wang, Wen-Chun
• Granted Patent: US 8,638,399 B2
• Time in Patent Office: Days
• US Class Current: 345/176
• CPC Class Codes: G02F 1/133334 Electromagnetic shields
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/136204 Arrangements to prevent high voltage or static electricity failures
• 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 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• 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 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• 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: G09G 3/36 using liquid crystals

Abstract

A touch display device including a display, a touch panel and a transparent shielding layer is provided. The touch panel is disposed on the display, and includes a substrate and touch sensors positioned thereon. The transparent shielding layer is set between the display and the touch sensors of the touch panel, and includes an edge region and a central region wherein the impedance of the edge region is less than or equal to that of the central region.

Claims

1. A touch display device, comprising:

a display device;

a touch panel, disposed on the display device, and including;

a substrate; and

a touch sensor disposed on the substrate; and

a transparent shielding layer disposed between the display device and the touch sensor, and including an edge region and a central region, wherein an impedance of the edge region is less than or equal to an impedance of the central region.

2. The touch display device according to claim 1, further comprising a low-impedance layer disposed in the edge region of the transparent shielding layer and grounded with the transparent shielding layer in common.

3. The touch display device according to claim 2, wherein the display device is a liquid crystal display device, and comprises:

an active array substrate;

a color filter layer disposed parallel to the active array substrate;

a liquid crystal layer disposed between the active array substrate and the color filter layer; and

a common electrode disposed on the liquid crystal layer.

4. The touch display device according to claim 3, wherein the transparent shielding layer and the low-impedance layer are disposed on a surface of the color filter layer facing the active array substrate.

5. The touch display device according to claim 3, wherein the transparent shielding layer and the low-impedance layer are disposed on a surface of the color filter layer far away from the active array substrate.

6. The touch display device according to claim 3, wherein the substrate is a transparent cover plate, wherein the touch sensor is disposed on the transparent cover plate.

7. The touch display device according to claim 2, wherein the low-impedance layer is made of metal material.

8. The touch display device according to claim 3, wherein the touch sensor comprises:

a plurality of first sensing electrodes disposed on the color filter layer in a first direction;

a plurality of second sensing electrodes disposed on the color filter layer in a second direction, wherein the second direction is perpendicular to the first direction; and

an insulating layer disposed between the first sensing electrodes and the second sensing electrodes.

9. The touch display device according to claim 6, wherein the touch sensor comprises:

a plurality of first sensing electrodes disposed on the color filter layer in a first direction; and

a plurality of second sensing electrodes disposed on the transparent cover plate in a second direction, wherein the second direction is perpendicular to the first direction.

10. The touch display device according to claim 6, wherein the touch sensor comprises:

a plurality of first sensing electrodes disposed on the transparent cover plate in a first direction;

a plurality of second sensing electrodes disposed on the transparent cover plate in a second direction, wherein the second direction is perpendicular to the first direction; and

an insulating layer disposed between the first sensing electrodes and the second sensing electrodes.