Sensor-equipped display device including display panel and detection electrode

• US 10,013,122 B2
• Filed: 06/09/2015
• Issued: 07/03/2018
• Est. Priority Date: 06/10/2014
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Kurasawa, Hayato, Ishizaki, Koji
• Primary Examiner(s): Nguyen, Lauren
• Application Number:
  US14/734,702
• Publication Number:
  US 20150355510A1
• Time in Patent Office: 1,120 Days
• 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 3/0443 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

According to one embodiment, a sensor-equipped display device comprises a display panel and a detection electrode. The panel includes a display area in which pixels are arranged with a first pixel pitch in a first direction and a second pixel pitch in a second direction. The electrode includes an pattern having line fragments. The pattern has connection points at which ends of the fragments are connected to each other, and at least part of the connection points is arranged linearly such that an arrangement gaps thereof in the first and second direction is set to a first and second connection point pitch.

Claims

1. A sensor-equipped display device, comprising:

a display panel including a display area in which unit pixels are arranged with a first pixel pitch in a first direction and a second pixel pitch in a second direction, each of the unit pixels including a plurality of subpixels corresponding to different colors;

a detection electrode including an electrode pattern having conductive line fragments arranged on a detection surface which is parallel to the display area, the detection electrode configured to detect a contact or approach of an object to the detection surface; and

a driving electrode configured to form a capacitance between the detection electrode and the driving electrode, wherein

each of the line fragments includes a metal material that blocks light,

the driving electrode is formed of a transparent conductive material that is different from the metal material,

the driving electrode is disposed in a layer different from the detection electrode in a normal direction of the display area to be opposed to the detection electrode with a dielectric intervening between the detection electrode and the driving electrode,

the electrode pattern has a plurality of connection points at which ends of the line fragments are connected to each other, and at least part of the connection points is arranged linearly such that an arrangement gap thereof in the first direction is set to a first connection point pitch and an arrangement gap thereof in the second direction is set to a second connection point pitch,

the first connection point pitch is defined to exclude a range from 0.5×

first pixel pitch×

(integer−

0.05) to 0.5×

first pixel pitch×

(integer+0.05), and

the second connection point pitch is defined to exclude a range from 0.5×

second pixel pitch×

(integer−

0.05) to 0.5×

second pixel pitch×

(integer+0.05).

2. The sensor-equipped display device according to claim 1, wherein

the first connection point pitch is defined to exclude a range from 0.5×

first pixel pitch×

(integer−

0.1) to 0.5×

first pixel pitch×

(integer+0.1), and

the second connection point pitch is defined to exclude a range from 0.5×

second pixel pitch×

(integer−

0.1) to 0.5×

second pixel pitch×

(integer+0.1).

3. The sensor-equipped display device according to claim 1, wherein

the electrode pattern includes first line fragment and second line fragment which are tilted at different angles with respect to the first direction, the first and second line fragments arranged alternately while being connected to an adjacent fragment at ends thereof, and

the connection points arranged linearly are connection points to connect an end of the first line fragment to an end of the second line fragment.

4. The sensor-equipped display device according to claim 1, wherein

the electrode pattern includes a plurality of unit patterns of which outlines are closed by the line fragments, and

the outlines of adjacent unit patterns share at least one line fragment.

5. The sensor-equipped display device according to claim 1, wherein

the electrode pattern includes different kinds of unit patterns of which outlines are closed by the line fragments respectively, and

the outlines of the different kinds of unit patterns have different shapes.

6. The sensor-equipped display device according to claim 1, wherein

the electrode pattern includes a plurality of unit patterns each having a polygonal shaped outline in which at least one interior angle is greater than 180°

.

7. The sensor-equipped display device according to claim 1, comprising

a detection circuit configured to detect a contact or approach of an object to the detection surface based on a change in the capacitance.

8. The sensor equipped display device according to claim 1, wherein the display panel comprises a common electrode forming a capacitance between the detection electrode and thereof, and a pixel electrode provided with each subpixel to be opposed to the common electrode with an insulating film intervening therebetween, and

the display panel further comprises a detection circuit configured to detect a contact or approach of an object to the detection surface based on a change in the capacitance, and a driving circuit configured to supply a first driving signal for driving the subpixels and a second driving signal for forming the capacitance used by the detection circuit to detect a contact or approach of an object to the detection surface, selectively, to the common electrode.

9. The sensor-equipped display device according to claim 1, wherein

the driving electrode includes a plurality of divisional electrodes, and

the divisional electrodes are extended substantially linearly in the second direction.