TOUCH DISPLAY DEVICE

• US 20130229364A1
• Filed: 06/15/2012
• Published: 09/05/2013
• Est. Priority Date: 03/01/2012
• Status: Abandoned Application

• Current Assignee: HannStar Display Corporation
• Original Assignee: HannStar Display Corporation
• Inventors: Yu, Chia-Hua, Wu, Hsu-Ho, Liu, Hsuan-Chen
• Application Number:
  US13/523,908
• Publication Number:
  US 20130229364A1
• Time in Patent Office: Days
• US Class Current: 345/173
• 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 3/0445 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

Abstract

A touch display device including a display panel, a shielding electrode layer, a touch panel, a conductive element and a flexible circuit board is provided. The shielding electrode layer covers a top surface of the display panel. The touch panel disposed on the shielding electrode layer includes a substrate, a touch control element, a ground electrode and a metal wire. The touch control element includes a sensing electrode, a transmission wire and two pads. The transmission wire is electrically connected to the sensing electrode and one pad. The meal wire is connected between the ground electrode and the other pad. The shielding electrode layer is electrically connected to the metal wire or the ground electrode of the touch panel through the conductive element. The flexible circuit board is electrically connected to the pads, so that the sensing electrode and the metal wire are electrically connected to the flexible circuit board.

Claims

1. A touch display device, comprising:

a display panel, having a top surface;

a shielding electrode layer, disposed on the display panel, and covering the top surface;

a touch panel, disposed on the shielding electrode layer, and having a sensing region and a peripheral region surrounding the sensing region, and the touch panel comprising;

a substrate;

a touch control element, disposed on the substrate, and the touch control element comprising at least one sensing electrode, at least one transmission wire and at least two pads, wherein the sensing electrode is located in the sensing region, the transmission wire and the pads are located in the peripheral region, and the transmission wire is located between the sensing electrode and one of the pads, and is electrically connected to the sensing electrode and one of the pads;

at least one ground electrode, disposed in the peripheral region of the substrate; and

at least one metal wire, disposed in the peripheral region of the substrate, wherein the metal wire is connected between the ground electrode and another one of the pads;

a conductive element, disposed between the shielding electrode layer and the touch panel, wherein the shielding electrode layer is electrically connected to the metal wire or the ground electrode of the touch panel through the conductive element; and

a flexible circuit board, disposed on the touch panel, and located in the peripheral region, wherein the flexible circuit board is electrically connected to the pads, so that the sensing electrode and the metal wire are electrically connected to the flexible circuit board.

2. The touch display device as claimed in claim 1, wherein the at least one ground electrode comprises a first ground electrode and a second ground electrode, the at least one metal wire comprises a first metal wire and a second metal wire, the at least two pads comprise a first pad, a second pad and at least one third pad located between the first pad and the second pad, the first metal wire is electrically connected to the first ground electrode and the first pad, and the second metal wire is electrically connected to the second ground electrode and the second pad, and the transmission wire is connected to the third pad.

3. The touch display device as claimed in claim 1, wherein the ground electrode is a ring-shape ground electrode surrounding the sensing region and having a first end and a second end opposite to each other, the at least one metal wire comprises a first metal wire and a second metal wire, the at least two pads comprise a first pad, a second pad and at least one third pad located between the first pad and the second pad, the first metal wire is electrically connected to the first end of the ring-shape ground electrode and the first pad, and the second metal wire is electrically connected to the second end of the ring-shape ground electrode and the second pad, and the transmission wire is connected to the third pad.

4. The touch display device as claimed in claim 1, wherein the at least one ground electrode comprises a first type ring-shape ground electrode and a second type ring-shape ground electrode, the first type ring-shape ground electrode and the second type ring-shape ground electrode surround the sensing region, and the first type ring-shape ground electrode has a first end and a second end opposite to each other, and the second type ring-shape ground electrode has a third end and a fourth end opposite to each other, the at least one metal wire comprises a first metal wire and a second metal wire, the at least two pads comprise a first pad, a second pad and at least one third pad located between the first pad and the second pad, the first metal wire is electrically connected to the first end of the first type ring-shape ground electrode and the first pad, the second metal wire is electrically connected to the third end of the second type ring-shape ground electrode and the second pad, the second end of the first type ring-shape ground electrode is adjacent to the fourth end of the second type ring-shape ground electrode, and the transmission wire is connected to the third pad.

5. The touch display device as claimed in claim 1, wherein the at least one ground electrode comprises a first ground electrode and a second ground electrode, the at least one metal wire comprises a first metal wire, a second metal wire and a third metal wire, the at least two pads comprise a first pad, a second pad and at least one third pad located between the first pad and the second pad, the first metal wire is electrically connected to the first ground electrode and the first pad, the second metal wire is electrically connected to the second ground electrode and the second pad, the third metal wire is electrically connected to the first ground electrode and the second ground electrode and surrounds the sensing region, and the transmission wire is connected to the third pad.

6. The touch display device as claimed in claim 1, wherein the at least one sensing electrode comprises a plurality of first sensing series and a plurality of second sensing series, each of the first sensing series extends along a first direction and comprises a plurality of first sensing electrode pads and a plurality of first bridge electrodes electrically connecting the first sensing electrode pads, each of the second sensing series extends along a second direction and comprises a plurality of second sensing electrode pads and a plurality of second bridge electrodes electrically connecting the second sensing electrode pads, each of the second bridge electrodes is insulated from the corresponding first bridge electrode through an insulation layer, the first direction is intersected with the second direction, and the first sensing series and the second sensing series are intersected with each other, the at least one transmission wire comprises a plurality of transmission wires disposed at peripheral of the first sensing series and the second sensing series, and each of the transmission wires is connected to one of the first sensing series and the second sensing series.

7. The touch display device as claimed in claim 6, wherein the first sensing electrode pads, the second sensing electrode pads and the ground electrode belong to a same film layer, and the second bridge electrodes, the transmission wires and the metal wire belong to a same film layer.

8. The touch display device as claimed in claim 1, further comprising an adhesive glue disposed between the touch panel and the shielding electrode layer, wherein the touch panel is fixed on the display panel through the adhesive glue.

9. The touch display device as claimed in claim 1, wherein the display panel comprises a transmissive display panel, a trans-reflective display panel, a reflective display panel, a vertical alignment (VA) display panel, an in plane switch (IPS) display panel, a multi-domain vertical alignment (MVA) display panel, a twist nematic (TN) display panel, a fringe field switching (FFS) display panel or an organic light-emitting diode (OLED) display panel.

10. The touch display device as claimed in claim 1, wherein the touch panel comprises a capacitive touch panel, an acoustic wave touch panel, an infrared touch panel or an optical touch panel.