In-cell type touch panel and manufacturing method thereof, liquid crystal display device

• US 10,095,335 B2
• Filed: 05/12/2016
• Issued: 10/09/2018
• Est. Priority Date: 04/27/2016
• Status: Active Grant

• Current Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Li, Man, Guo, Xingling, Xing, Zhenzhou
• Primary Examiner(s): Nguyen, Sang V
• Application Number:
  US15/100,370
• Publication Number:
  US 20180081470A1
• Time in Patent Office: 880 Days
• CPC Class Codes: G02F 1/133302 Rigid substrates, e.g. inorganic substrates
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/136295 Materials; Compositions; Manufacture processes
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• 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 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

An in-cell type touch panel, a manufacturing method thereof and a LCD device are provided. The touch panel includes an array substrate including: a glass substrate, thin film transistors, a planarization layer overlying the thin film transistors, a connecting wire on the planarization layer, a first insulating layer overlying the connecting wire, a touch sensing electrode on the first insulating layer, a second insulating layer overlying the touch sensing electrode and a pixel electrode on the second insulating layer. The connecting wire is connected to the touch sensing electrode by a first via hole, and the pixel electrode is connected to one of the thin film transistors by a second via hole. The touch sensing electrode further is configured as a common electrode, and during a displaying time period of an image frame, the touch sensing electrode transmits a common voltage and a touch control signal in time division manner.

Claims

1. An in-cell type touch panel comprising an array substrate;

wherein the array substrate comprises;

a glass substrate, thin film transistors disposed on the glass substrate in an array, a planarization layer overlying the thin film transistors, a connecting wire formed on the planarization layer, a first insulating layer overlying on the connecting wire, a touch sensing electrode formed on the first insulating layer, a second insulating layer overlying the touch sensing electrode, and a pixel electrode formed on the second insulating layer;

wherein the connecting wire is electrically connected to the touch sensing electrode by a first via hole disposed in the first insulating layer, the pixel electrode is electrically connected to a corresponding one of the thin film transistors by a second via hole disposed in the second insulating layer, the first insulting layer and the planarization layer;

wherein the touch sensing electrode further is configured as a common electrode, and during a displaying time period of a frame of image, the touch sensing electrode is configured for transmitting a common voltage and a touch control signal in time division manner;

wherein the connecting wire, the first insulating layer, the touch sensing electrode, the second insulating layer, and the pixel electrode are formed on the planarization layer in sequence in a predetermined direction pointing away from the planarization layer, such that the pixel electrode is further away from the planarization layer than the touch sensing electrode in the predetermined direction and a distance between the pixel electrode and the connecting wire in the predetermined direction is greater than a distance between the touch sensing electrode and the connecting wire.

2. The in-cell type touch panel according to claim 1, wherein a material of the connecting wire is a metal material, a material of the touch sensing electrode and a material of the pixel electrode each are ITO.

3. The in-cell type touch panel according to claim 1, wherein a material of the first insulating layer and a material the second insulating layer each are SiN_x, SiO_x or SiN_xO_y.

4. The in-cell type touch panel according to claim 1, wherein each of the thin film transistors comprises a source electrode, a drain electrode, a gate electrode and an active layer;

the active layer is connected onto the glass substrate, the source electrode and the drain electrode are disposed in a same layer and located above the active layer, the gate electrode is disposed above the source electrode and the drain electrode;

a third insulating layer is disposed between the source electrode and the active layer as well as between the drain electrode and the active layer;

the source electrode and the drain electrode respectively are connected to the active layer by via holes disposed in the third insulating layer;

a fourth insulating layer is disposed between the source electrode and the gate electrode as well as between the drain electrode and the gate electrode.

5. The in-cell type touch panel according to claim 4, wherein an ohmic contact layer is arranged between the active layer and the source electrode as well as between the active layer and the drain electrode.

6. The in-cell type touch panel according to claim 4, wherein a material of the third insulating layer and a material of the fourth insulating layer each are SiN_x, SiO_x or SiN_xO_y.

7. The in-cell type touch panel according to claim 1, wherein the in-cell type touch panel further comprises a color filter substrate disposed opposite to the array substrate and a liquid crystal layer arranged between the array substrate and the color filter substrate.

8. The in-cell type touch panel according to claim 1, wherein a fifth insulating layer is arranged between the planarization layer and the connecting wire, a material of the fifth insulating layer is SiN_x, SiO_x or SiN_xO_y.

9. A liquid crystal display device comprising a liquid crystal display panel and a backlight module, wherein the liquid crystal display panel and the backlight module are disposed opposite to each other, the backlight module is configured for providing a display light source to the liquid crystal display panel in order to make the liquid crystal display panel display an image, the liquid crystal display panel is an in-cell type touch panel;

wherein the in-cell type touch panel comprises an array substrate, the array substrate comprises;

a glass substrate, thin film transistors disposed on the glass substrate in an array, a planarization layer overlying the thin film transistors, a connecting wire formed on the planarization layer, a first insulating layer overlying the connecting wire, a touch sensing electrode formed on the first insulating layer, a second insulating layer overlying the touch sensing electrode and a pixel electrode formed on the second insulating layer;

wherein the connecting wire is electrically connected to the touch sensing electrode by a first via hole disposed in the first insulating layer, the pixel electrode is electrically connected to a corresponding one of the thin film transistors by a second via hole disposed in the second insulating layer, the first insulting layer and the planarization layer;

wherein the touch sensing electrode further is configured as a common electrode, and during a displaying time period of a frame of image, the touch sensing electrode is configured for transmitting a common voltage and a touch control signal in time division manner;

wherein the connecting wire, the first insulating layer, the touch sensing electrode, the second insulating layer, and the pixel electrode are formed on the planarization layer in sequence in a predetermined direction pointing away from the planarization layer, such that the pixel electrode is further away from the planarization layer than the touch sensing electrode in the predetermined direction and a distance between the pixel electrode and the connecting wire in the predetermined direction is greater than a distance between the touch sensing electrode and the connecting wire.

10. The liquid crystal display device according to claim 9, wherein a material of the connecting wire is a metal material, a material of the touch sensing electrode and a material of the pixel electrode each are ITO.

11. The liquid crystal display device according to claim 9, wherein a material of the first insulating layer and a material of the second insulating layer each are SiN_x, SiO_x or SiN_xO_y.

12. The liquid crystal display device according to claim 9, wherein each of the thin film transistors comprises a source electrode, a drain electrode, a gate electrode and an active layer;

the active layer is connected onto the glass substrate, the source electrode and drain electrode are disposed in a same layer and located above the active layer, the gate electrode is disposed above the source electrode and the drain electrode;

a third insulating layer is disposed between the source electrode and the active layer as well as between the drain electrode and the active layer, the source electrode and the drain electrode respectively are connected to the active layer by via holes formed in the third insulating layer;

a fourth insulating layer is disposed between the source electrode and the gate electrode as well as between the drain electrode and the gate electrode.

13. The liquid crystal display device according to claim 12, wherein an ohmic contact layer is arranged between the active layer and the source electrode as well as between the active layer and the drain electrode.

14. The liquid crystal display device according to claim 12, wherein a material of the third insulating layer and a material of the fourth insulating layer each are SiN_x, SiO_x or SiN_xO_y.

15. The liquid crystal display device according to claim 9, wherein the in-cell type touch panel further comprises a color filter substrate disposed opposite to the array substrate and a liquid crystal layer arranged between the array substrate and the color filter substrate.

16. The liquid crystal display device according to claim 9, wherein a fifth insulating layer is arranged between the planarization layer and the connecting wire, a material of the fifth insulating layer is SiN_x, SiO_x or SiN_xO_y.