INPUT DETECTION DEVICE

• US 20180046296A1
• Filed: 08/09/2017
• Published: 02/15/2018
• Est. Priority Date: 08/10/2016
• Status: Active Grant

• Current Assignee: Wacom Co Limited (Wacom)
• Original Assignee: Japan Display Incorporated
• Inventors: KATSUTA, Tadayoshi
• Granted Patent: US 10,429,973 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/1343 Electrodes reflective electrodes G02F1/133553
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 3/03545 Pens or stylus
• 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 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• 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
• CPC Class Codes: G06F 3/046 by electromagnetic means

Abstract

The input detection device includes: a line having an end to which a driving signal is supplied and extending in a first direction; a plurality of drive electrodes extending in a second direction intersecting the first direction and arranged in parallel in the first direction; a selecting drive circuit selecting the drive electrode from the plurality of drive electrodes and connecting an end of the selected drive electrode to the line; a driving signal circuit supplying the driving signal to the end of the line; and a plurality of line patterns connected to each drive electrode. A line density of line patterns connected to a drive electrode connected to be close to the end of the line is smaller than a line density of line patterns connected to another drive electrode connected to be far from the end of the line.

Claims

1. An input detection device comprising:

a substrate;

a line having an end connected to a driving signal circuit which supplies a driving signal and extending in a first direction on the substrate;

a plurality of drive electrodes arranged in the first direction on the substrate;

a selecting drive circuit which connects an end of the drive electrode selected from the plurality of drive electrodes to the line when it is detected that an external object is close based on change in a magnetic field; and

a plurality of first line patterns superimposed on each of the plurality of drive electrodes in a plan view and electrically connected to the drive electrode,

wherein a line density of the first line patterns connected to the drive electrode which is close to the end of the line connected to the driving signal circuit is smaller than a line density of the first line patterns connected to the drive electrode which is far from the end of the line connected to the driving signal circuit.

2. The input detection device according to claim 1,

wherein each of the plurality of first line patterns has a shape extending in a second direction intersecting the first direction in a plan view.

3. The input detection device according to claim 2,

wherein the line density of the first line patterns is made small by connecting the first line patterns, whose number of line patterns are smaller than a number of the first line patterns connected to the drive electrode connected to be far from the end of the line, to the drive electrode connected to be close to the end of the line.

4. The input detection device according to claim 2,

wherein the line density of the first line patterns is made small by connecting the first line patterns, whose area is smaller than an area of the first line patterns connected to the drive electrode connected to be far from the end of the line, to the drive electrode connected to be close to the end of the line.

5. The input detection device according to claim 2,

wherein the input detection device further includes

second line patterns not connected to the plurality of drive electrodes,

the second line patterns are arranged to be in the same layer as the first line patterns and to be parallel to the first direction, and

a total area of the first line patterns overlapping the drive electrode in a plan view and the second line patterns is substantially equal between the drive electrode arranged to be close to the end of the line and the drive electrode arranged to be far from the end of the line.

6. The input detection device according to claim 5,

wherein the input detection device further includes:

a drive electrode; and

an insulating film interposed between the first line patterns and the second line patterns,

wherein the first number of first line patterns are connected to the drive electrode connected to be close to the end of the line by an opening formed in the insulating film, and

a second number of the second line patterns whose number is larger than the first number are connected to the drive electrode connected to be far from the end of the line by the opening formed in the insulating film.

7. The input detection device according to claim 2,

wherein the plurality of first line patterns oppose the plurality of drive electrodes so as to overlap the drive electrode to be connected in a plan view.

8. The input detection device according to claim 2,

wherein, when it is detected that the external object is close based on the change in the magnetic field, the plurality of drive electrodes adjacent to each other in a plan view are selected from the plurality of drive electrodes, and are connected to the line.

9. The input detection device according to claim 8,

wherein the smaller number of drive electrodes are selected and are connected to the line when it is detected that the external object is close based on change in an electric field than when it is detected that the external object is close based on the change in the magnetic field.

10. The input detection device according to claim 1,

wherein the input detection device further includes:

a plurality of detection electrodes arranged so as to intersect the plurality of drive electrodes in a plan view, and

the change in the magnetic field caused when the external object is close is detected by the plurality of detection electrodes.

11. The input detection device according to claim 1,

wherein the first line pattern is made of a metal.