Embedded touch control display device configured to minimize parasitic capacitance

• US 9,235,308 B2
• Filed: 07/16/2013
• Issued: 01/12/2016
• Est. Priority Date: 08/08/2012
• Status: Active Grant

• Current Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited), Tianma Microelectronics Company Limited
• Original Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited), Tianma Microelectronics Company Limited
• Inventors: Zhou, Xingyao, Liu, Baoling, Ren, Jiaoyan, Ma, Jun
• Primary Examiner(s): Lubit, Ryan A
• Application Number:
  US14/420,347
• Publication Number:
  US 20150205406A1
• Time in Patent Office: 910 Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• 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 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• 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

An embedded touch control display device is disclosed. The embedded touch control display device includes a first substrate and a second substrate which are set oppositely; an in-plane switching (IPS) or fringe field switching (FFS) display mode display structure and a capacitance touch structure which are set between the first substrate and the second substrate, and the IPS or FFS display mode display structure is located on the first substrate and comprises a pixel electrode layer, a first medium layer, a public electrode layer and a crystal layer, and the capacitance touch structure is located on the second substrate and comprises touch electrode and a second medium layer; an planarization layer which is located between the second medium layer and the crystal layer; the distance between the touch electrode and the crystal layer is 4 micrometers to 7 micrometers.

Claims

1. An embedded touch display device, comprising:

a first substrate;

a second substrate disposed opposite to the first substrate;

a display structure in an IPS (in-plane-switching) or FFS (fringe field switching) modes;

a capacitive touch structure, wherein both the display structure and the capacitive touch structure are located between the first substrate and the second substrate, wherein the display structure is located on a surface of the first substrate facing the second substrate, and wherein the display structure comprises;

a pixel electrode layer,

a first dielectric layer,

a common electrode layer,

a liquid crystal layer,

wherein the capacitive touch structure is located on a surface of the second substrate facing the first substrate and comprises a touch electrode and a second dielectric layer located on the touch electrode; and

a planarization layer located between the second dielectric layer and the liquid crystal layer,

wherein a distance between the touch electrode and the liquid crystal layer is in a range of 4 μ

m˜

7 μ

m to minimize parasitic capacitance.

2. The embedded touch display device according to claim 1, wherein the first substrate and the second substrate are transparent insulating substrates.

3. The embedded touch display device according to claim 1, wherein the pixel electrode layer and the common electrode layer are transparent conductive layers.

4. The embedded touch display device according to claim 1, wherein the common electrode layer comprises a plurality of common electrodes arranged in parallel.

5. The embedded touch display device according to claim 1, wherein the capacitive touch structure comprises a plurality of sensing electrodes arranged in parallel and a plurality of drive electrodes arranged in parallel, and the sensing electrodes are substantially perpendicular to the drive electrodes,

wherein each sensing electrode or each drive electrode comprises a plurality of small partitioned electrode patterns, and

wherein the electrode patterns of each sensing electrode are electrically connected together through wires and the drive electrodes are electrically connected together through wires.

6. The embedded touch display device according to claim 5, wherein the drive electrodes and the sensing electrodes comprise an indium tin oxide layer and a metal layer overlapping with each other, and the metal layer has a net structure.

7. The embedded touch display device according claim 6, wherein the metal layer is covered by a protective layer.

8. The embedded touch display device according to claim 1, wherein the second dielectric layer is a color film having a dielectric constant of 3.5.

9. The embedded touch display device according to claim 1, wherein the planarization layer is an organic film having a dielectric constant of 3.5.

10. The embedded touch display device according to claim 1, wherein an alignment layer is coated between the planarization layer and the liquid crystal layer, and the alignment layer is a polyimide layer.

11. The embedded touch display device according to claim 1, further comprising a third dielectric layer disposed between the first substrate and the pixel electrode layer.

12. The embedded touch display device according to claim 1, wherein the liquid crystal layer has a thickness of 3.5 μ

m.