Touch Integrated Display Device

• US 20120218482A1
• Filed: 12/27/2011
• Published: 08/30/2012
• Est. Priority Date: 02/25/2011
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Hwang, Sangsoo, Han, Manhyeop, Kim, Cheolse
• Granted Patent: US 8,792,062 B2
• Time in Patent Office: Days
• US Class Current: 349/12
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• 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 3/0445 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

The present invention provides a touch integrated display device which reduces a thickness of a display device and can improve touch performance. The touch integrated display device according to one embodiment of the present invention can include: a TFT positioned on a lower substrate; a pixel electrode connected to the TFT; a common electrode facing the pixel electrode to form electric field; a liquid crystal layer positioned on the common electrode; an upper substrate facing the lower substrate which is positioned at both sides of the liquid crystal layer; a driving electrode which is positioned on one side of the upper substrate adjacent to the liquid crystal layer; and a sensing electrode which is positioned on the other side of the upper substrate and faces the driving electrode.

Claims

1. A touch integrated display device, comprising:

a TFT on a lower substrate;

a pixel electrode connected to the TFT;

a common electrode facing the pixel electrode to form electric field;

a liquid crystal layer on the common electrode;

an upper substrate facing the lower substrate which is positioned at two sides of the liquid crystal layer;

a driving electrode which is positioned on one side of the upper substrate adjacent to the liquid crystal layer; and

a sensing electrode which is positioned on the other side of the upper substrate and faces the driving electrode.

2. The touch integrated display device of claim 1, wherein the upper substrate includes a black matrix, and the driving electrode is the black matrix.

3. The touch integrated display device of claim 1, wherein an upper polarizer is positioned on the driving electrode and a lower polarizer is positioned at a lower surface of the lower substrate.

4. The touch integrated display device of claim 1, wherein an upper polarizer, an electrode film, an adhesive, and a reinforcing glass plate are sequentially stacked on the upper substrate and the driving electrode is positioned between the upper polarizer and the electrode film.

5. The touch integrated display device of claim 1, wherein an upper polarizer, an adhesive, an electrode film, and a reinforcing glass plate are sequentially stacked on the upper substrate and the driving electrode is positioned between the electrode film and the reinforcing glass plate.

6. The touch integrated display device of claim 1, wherein a driving method of the liquid crystal layer is an IPS method or a FFS method.

7. A touch integrated display device, comprising:

a TFT on a lower substrate;

a pixel electrode connected to the TFT;

a liquid crystal layer on the pixel electrode;

an upper substrate facing the lower substrate positioned at two sides of the liquid crystal layer;

a common electrode on one surface of the upper substrate adjacent to the liquid crystal layer; and

a sensing electrode on the other side of the upper substrate.

8. The touch integrated display device of claim 7, wherein the common electrode forms electric fields together with the pixel electrode and the sensing electrode.

9. The touch integrated display device of claim 7, wherein an upper polarizer is positioned on the sensing electrode and a lower polarizer is positioned at a lower surface of the lower substrate.

10. The touch integrated display device of claim 7, wherein a driving method of the liquid crystal layer is a TN method or a VA method.