Touch display panel and touch display device

• US 9,684,402 B2
• Filed: 01/22/2014
• Issued: 06/20/2017
• Est. Priority Date: 01/25/2013
• 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: Huang, Zhongshou
• Primary Examiner(s): Patel, Sanjiv D
• Application Number:
  US14/422,174
• Publication Number:
  US 20160011705A1
• Time in Patent Office: 1,245 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• 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 3/0445 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

Provided are a touch display panel and a touch display device. The touch display panel comprises a TFT array substrate (200) and a color film substrate (100) arranged opposite to each other. The TFT array substrate (200) comprises: a plurality of touch drive wires (TD), a plurality of touch sensing wires (TS), and a plurality of touch TFTs (220), one of the source (2053) and the drain (2054) of the touch TFTs (220) is electrically connected to the touch drive wires (TD), and the other one of the source (2053) and the drain (2054) of the touch TFTs (220) is electrically connected to the touch sensing wires (TS). The color film substrate (100) comprises: a plurality of conductive pillars (110) facing the TFT array substrate (200), and the conductive pillars (110) are arranged corresponding to the touch TFTs (220) to control the channel current of the touch TFTs (220). TFT arrays in the provided touch display panel and touch display device are compatible with the existing pixel array structure and technology, without adding additional process steps, and the realization of the touch function and the realization of the display function do not interfere with each other.

Claims

1. A touch display panel, comprising:

a thin film transistor (TFT) array substrate, comprising;

a plurality of scanning lines,

a plurality of data lines insulated and intersected with the plurality of scanning lines, and

a plurality of pixel units arranged in a pixel array,

a plurality of touch drive lines,

a plurality of touch induction lines, and

a plurality of touch TFTs,

wherein one of a source electrode and a drain electrode of each touch TFT is electrically connected with one of the touch drive lines, the other of the source electrode and the drain electrode of each touch TFT is electrically connected with one of the touch induction lines, the touch drive lines for touch and the data lines for display are shared, and a touch drive signal of the touch TFT is an image data signal of the pixel array;

a color filter substrate, comprising a plurality of conductive spacers facing the TFT array substrate, wherein the conductive spacers are disposed so as to correspond with the touch TFTs for controlling the channel current of the touch TFTs; and

a main spacer, wherein when no touch occurs, two ends of the main spacer respectively contact the TFT array substrate and the color filter substrate, and a length of the main spacer is equal to a length of the conductive spacer.

2. The touch display panel according to claim 1, wherein the touch TFT comprises:

an active layer;

a source electrode; and

a drain electrode,

wherein the source electrode and the drain electrode are electrically connected with the active layer, wherein the source electrode and the drain electrode are separated, and wherein the active layer between the source electrode and the drain electrode forms a channel.

3. The touch display panel according to claim 2, wherein:

when no touch occurs, the free end of the conductive spacer does not contact the TFT array substrate, and the channel current is 0; and

when a touch occurs, the conductive spacer approaches the channel of the touch TFT with pressing, and the channel current is not 0.

4. The touch display panel according to claim 2, wherein the free end of the conductive spacer is aligned with the channel of the touch TFT, and when a touch occurs, the conductive spacer is isolated from an active layer in the channel region by an insulating layer.

5. The touch display panel according to claim 1, wherein the touch TFT comprises:

an active layer;

a source electrode; and

a drain electrode,

wherein the source electrode and the drain electrode are electrically connected with the active layer, the source electrode and the drain electrode are separated, the active layer between the source electrode and the drain electrode forms a channel; and

a top gate electrode located above the channel, wherein when a touch is applied to the touch display panel, the top gate electrode is disconnected from a scanning line of the touch display panel, and when no touch is applied to the touch display panel, the top gate electrode is disconnected from a scanning line of the touch display panel.

6. The touch display panel according to claim 5, wherein the free end of the conductive spacer is aligned with the top gate of the touch TFT, and when touch occurs, the conductive spacer is electrically connected with the top gate.

7. The touch display panel according to claim 1, wherein the touch TFT comprises:

an active layer;

a source electrode; and

a drain electrode,

wherein the source electrode and the drain electrode are electrically connected with the active layer respectively, wherein the source electrode and the drain electrode are separate, and wherein the active layer between the source electrode and the drain electrode forms a channel; and

a bottom gate electrode located below the channel,

wherein the TFT array substrate further comprises a touch electrode located on the surface layer thereof and electrically connected with the bottom gate of the touch TFT, the bottom gate of the touch TFT is disconnected from a scanning line of the touch display panel when a touch is applied to the touch display panel, and the bottom gate of the touch TFT is disconnected from a scanning line of the touch display panel when no touch is applied to the touch display panel.

8. The touch display panel according to claim 7, wherein the free end of the conductive spacer is aligned with the touch electrode, and when touch occurs, the conductive spacer is electrically connected with the touch electrode.

9. The touch display panel according to claim 1, wherein the color filter substrate further comprises a first conductive layer electrically connected with the plurality of conductive spacers.

10. The touch display panel of claim 9, wherein the first conductive layer is of an integral structure.

11. The touch display panel according to claim 9, wherein the conductive spacer comprises:

an insulating column; and

a second conductive layer located on the surface of the insulating column, wherein the first conductive layer and the second conductive layer are connected, are located on the same layer, and are made from the same material.

12. The touch display panel according to claim 1, wherein the conductive spacer is made from a conductive organic material, and the first conductive layer is a conductive black matrix.

13. The touch display panel according to claim 12, wherein:

the color filter substrate further comprises an upper substrate and a color filter layer, and the black matrix is located between the upper substrate and the color filter layer;

or the color filter substrate further comprises an upper substrate and a color filter layer thereon, and the black matrix is located between the color filter layer and the conductive spacer.

14. The touch display panel according to claim 1, wherein the main spacer comprises a first main spacer and a second main spacer, wherein the first main spacer transmits an external drive signal from the TFT array substrate to the first conductive layer on the color filter substrate.

15. The touch display panel according to claim 1, wherein:

one touch TFT is disposed in each pixel region;

or

one touch TFT is disposed in the pixel region every preset number of pixel units.

16. A touch display panel, comprising:

a thin film transistor (TFT) array substrate, comprising;

a plurality of scanning lines,

a plurality of data lines insulated and intersected with the plurality of scanning lines, and

a plurality of pixel units,

a plurality of touch drive lines,

a plurality of touch induction lines, and

a plurality of touch TFTs,

wherein one of a source electrode and a drain electrode of each touch TFT is electrically connected with one of the touch drive lines, the other of the source electrode and the drain electrode of each touch TFT is electrically connected with one of the touch induction lines, and the touch drive lines for touch and the data lines for display are shared;

a color filter substrate, comprising a plurality of conductive spacers facing the TFT array substrate and a first conductive layer electrically connected with the plurality of conductive spacers, wherein the conductive spacers are disposed so as to correspond with the touch TFTs for controlling the channel current of the touch TFTs; and

the first conductive layer comprises a plurality of separated first wires, and each first wire is at least electrically connected with one conductive spacer, and the first wires are different from the touch drive lines and the touch induction lines; and

a main spacer, wherein when no touch occurs, two ends of the main spacer respectively contact the TFT array substrate and the color filter substrate, and a length of the main spacer is equal to a length of the conductive spacer.

17. The touch display panel according to claim 16, wherein at least two of the touch drive lines, the touch induction lines, and the first wires are intersected in an insulated manner.

18. A touch display device, comprising a touch display panel, wherein the touch display panel comprises:

a thin film transistor (TFT) array substrate, comprising;

a plurality of scanning lines,

a plurality of data lines insulated and intersected with the plurality of scanning lines,

a plurality of pixel units arranged in a pixel array,

a plurality of touch drive lines,

a plurality of touch induction lines, and

a plurality of touch TFTs,

wherein one of a source electrode and a drain electrode of each touch TFT is electrically connected with one of the touch drive lines, the other of the source electrode and the drain electrode of each touch TFT is electrically connected with one of the touch induction lines, the touch drive lines for touch and the data lines for display are shared, and a touch drive signal of the touch TFT is an image data signal of the pixel array;

a color filter substrate, comprising a plurality of conductive spacers facing the TFT array substrate, wherein the conductive spacers are disposed so as to correspond with the touch TFTs for controlling the channel current of the touch TFTs; and

a main spacer, wherein when no touch occurs, two ends of the main spacer respectively contact the TFT array substrate and the color filter substrate, and a length of the main spacer is equal to a length of the conductive spacer.