Touch display panel

• US 9,588,368 B2
• Filed: 08/30/2013
• Issued: 03/07/2017
• Est. Priority Date: 07/20/2012
• Status: Active Grant

• Current Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited)
• Original Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited)
• Inventors: Wu, Tianyi
• Primary Examiner(s): Eisen, Alexander
• Assistant Examiner(s): Yang, Nan-Ying
• Application Number:
  US14/014,948
• Publication Number:
  US 20140022210A1
• Time in Patent Office: 1,285 Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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: G06F 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality

Abstract

A touch display panel includes a color film (CF) substrate and a TFT substrate disposed opposite to each other, a liquid crystal layer disposed between the CF substrate and the TFT substrate. A common electrode having a comb-shaped structure and/or a pixel electrode having a comb-shaped structure are disposed on the TFT substrate close to the liquid crystal layer. The touch display panel further includes a touch layer disposed on the CF substrate close to the liquid crystal layer and having a driving line and a detecting line insulated from each other. The driving line and/or the detecting line have a comb-shaped structure that is at least partially misaligned with respect to the comb-shaped structure of the common electrode and/or the comb-shaped structure of the pixel electrode.

Claims

1. A touch display panel, comprising:

a color film (CF) substrate;

a thin film transistor (TFT) substrate disposed opposite to the CF substrate;

a liquid crystal layer disposed between the CF substrate and the TFT substrate;

a common electrode having a comb-shaped structure and a pixel electrode having a comb-shaped structure disposed on the TFT substrate close to a side of the liquid crystal layer; and

a touch layer disposed on the CF substrate close to another side of the liquid crystal layer and comprising a driving line and a detecting line being insulated from each other;

wherein the driving line and/or the detecting line has a comb-shaped structure which does not overlap with the comb-shaped structure of the common electrode and/or the comb-shaped structure of the pixel electrode,

wherein the common electrode comprises a first bar portion and a plurality of comb-shaped portions connected to the first bar portion in each pixel unit of the TFT substrate, the pixel electrode comprises a third bar portion and a plurality of comb-shaped portions connected to the third bar portion in each pixel unit of the TFT substrate, the driving line and/or the detecting line comprises a second bar portion and a plurality of comb-shaped portions connected to the second bar portion, and both the plurality of comb-shaped portions of the common electrode and the plurality of comb-shaped portions of the pixel electrode are parallel to the plurality of comb-shaped portions of the driving line and/or the detecting line, wherein the first bar portion, the third bar portion and the second bar portion are different from each other,

wherein the plurality of comb-shaped portions of the common electrode does not overlap with the plurality of comb-shaped portion of the pixel electrode, and the plurality of comb-shaped portions of each of the common electrode and the pixel electrode does not overlap with the plurality of comb-shaped portions of the driving line and/or the detecting line, and

wherein,

a projection of one of the plurality of comb-shaped portions of the pixel electrode in a plane and a projection of one of the plurality of comb-shaped portions of the driving line and/or the detecting line in the plane are sandwiched between projections of two adjacent comb-shaped portions of the common electrode in the plane, or

a projection of one of the plurality of comb-shaped portions of the common electrode in a plane and a projection of one of the plurality of comb-shaped portions of the driving line and/or the detecting line in the plane are sandwiched between projections of two adjacent comb-shaped portions of the pixel electrode in the plane, or

a projection of one of the plurality of comb-shaped portions of the common electrode in a plane and a projection of one of the plurality of comb-shaped portions of the pixel electrode in the plane are sandwiched between projections of two adjacent comb-shaped portions of the driving line and/or the detecting line in the plane.

2. The touch display panel according to claim 1, wherein the comb-shaped structure of the driving line and/or the detecting line is complementary to the comb-shaped structure of the common electrode and/or the comb-shaped structure of the pixel electrode.

3. The touch display panel according to claim 1, wherein the driving line and the detecting line are formed substantially perpendicular to each other in a same layer.

4. The touch display panel according to claim 3, wherein the driving line separates the detecting line into separate portions that are connected by a first connecting portion bridging the driving line.

5. The touch display panel according to claim 3, wherein the detecting line separates the driving line into separate portions that are connected by a second connecting portion bridging the detecting line.

6. The touch display panel according to claim 1, wherein the touch layer comprises a first touch layer and a second touch layer being insulated from each other, the driving line being formed in the first touch layer, and the detecting line being formed in the second touch layer.

7. The touch display panel according to claim 6, wherein the second touch layer is closer to the liquid crystal layer than the first touch layer, and the comb-shaped structure of the detecting line is misaligned with respect to the comb-shaped structure of the common electrode and the comb-shaped structure of the pixel electrode.

8. The touch display panel according to claim 6, wherein the first touch layer is closer to the liquid crystal layer than the second touch layer, and the comb-shaped structure of the driving line is misaligned with respect to the comb-shaped structure of the common electrode and the comb-shaped structure of the pixel electrode.

9. The touch display panel according to claim 1, wherein the common electrode is disposed on a surface of the TFT substrate close to the liquid crystal layer.

10. The touch display panel according to claim 1, wherein the pixel electrode is disposed on a surface of the TFT substrate close to the liquid crystal layer.

11. The touch display panel according to claim 1, wherein the common electrode and the pixel electrode are separately disposed on a surface of the TFT substrate close to the liquid crystal layer.

12. The touch display panel according to claim 1, wherein the driving line and the detecting line are made of a transparent material.

13. The touch display panel according to claim 1, wherein the common electrode or the pixel electrode is made of a transparent material.

14. The touch display panel according to claim 12, wherein the material of the driving line and the detecting line is one of indium tin oxide, indium zinc oxide or a combination thereof.