Display panel with touch detection function

• US 10,248,253 B2
• Filed: 01/24/2018
• Issued: 04/02/2019
• Est. Priority Date: 02/27/2015
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation), Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Aoyama, Toshiyuki, Fukami, Tetsuo, Kajita, Daisuke, Takagi, Kazushige
• Primary Examiner(s): Jansen, II, Michael J
• Application Number:
  US15/878,413
• Publication Number:
  US 20180150180A1
• Time in Patent Office: 433 Days
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04111 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 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 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

Provided is a display panel including: a plurality of pixel electrodes divided into a plurality of groups; and a plurality of common electrodes arranged at a ratio of one to a plurality of pixel electrodes included in one of the plurality of groups. Each of a plurality of sensor electrode lines overlaps with corresponding one of a plurality of data signal lines in plan view. The plurality of sensor electrode lines and each of the plurality of common electrodes overlap each other in plan view. The each of the plurality of common electrodes is electrically connected to the plurality of sensor electrode lines. At least one insulating film is formed between each of a region between the data signal lines and the sensor electrode lines, a region between the sensor electrode lines and the common electrodes, and a region between the common electrodes and the pixel electrodes.

Claims

1. A display panel comprising:

a substrate;

a plurality of gate signal lines extending in a first direction and formed on the substrate;

a plurality of data signal lines and a plurality of sensor electrode lines, which extend in a second direction different from the first direction;

a plurality of pixel electrodes arranged so as to respectively correspond to a plurality of pixels arrayed in the first direction and the second direction, the plurality of pixel electrodes being divided into a plurality of groups; and

a plurality of common electrodes arranged at a ratio of one to a plurality of pixel electrodes included in one of the plurality of groups, wherein;

each of the plurality of sensor electrode lines overlaps with a corresponding one of the plurality of data signal lines in a plan view;

each of the plurality of common electrodes has at least two overlapping portions spaced apart from each other, each of the overlapping portions overlapping a corresponding one of the plurality of sensor electrode lines in the plan view;

a first insulating film is formed on the substrate and to cover the plurality of gate signal lines;

the plurality of data signal lines are formed on the first insulating film;

a second insulating film is formed to cover the plurality of data signal lines;

a third insulating film is formed on the second insulating film;

the plurality of sensor electrode lines are formed on the third insulating film; and

a fourth insulating film is formed to cover the third insulating film and the plurality of sensor electrode lines,

wherein a through-hole is formed through a pan of the fourth insulating film,

wherein the plurality of common electrodes are formed on the fourth insulating film and inside the through-hole to electrically connect one of the plurality of sensor electrode lines and a corresponding one of the plurality of common electrodes to each other,

wherein a fifth insulating film is formed to cover the plurality of common electrodes,

wherein the plurality of pixel electrodes are formed on the fifth insulating film, and wherein the third insulating film has a greater thickness than the second insulating film.

2. The display panel according to claim 1, wherein the plurality of common electrodes are arrayed at equal intervals in the first direction and the second direction.

3. The display panel according to claim 1, further comprising shielding wiring formed on the fifth insulating layer and arranged to cover a gap between two adjacent electrodes of the plurality of common electrodes in the plan view.

4. The display panel according to claim 1, wherein the plurality of common electrodes are arranged so that a gap between two adjacent electrodes of the plurality of common electrodes overlaps with a gap between adjacent pixels in the plan view.

5. The display panel according to claim 1, wherein the at least two overlapping portions of each of the plurality of common electrodes are neighboring to each other in the second direction.

6. The display panel according to claim 1, wherein the display panel detects a touch position by means of a self-capacitance method of a capacitive system.

7. The display panel according to claim 1, wherein the third insulating film is made of an organic material mainly containing acrylic.

8. The display panel according to claim 1, wherein the third insulating film has a greater thickness than the fourth insulating film.