IMAGE DISPLAY DEVICE

• US 20130241869A1
• Filed: 01/16/2013
• Published: 09/19/2013
• Est. Priority Date: 03/14/2012
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Inventors: Kida, Yoshitoshi, Noguchi, Koji, Ishizaki, Koji, Azumi, Kohei
• Granted Patent: US 9,495,044 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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

Abstract

An image display device includes: a first substrate which has a first surface and a second surface facing the first surface; a second substrate which has a first surface and a second surface facing the first surface, the first surface being arranged to face the second surface of the first substrate, and is made of a transparent material; and an image display layer which is arranged between the first substrate and the second substrate, wherein a driving electrode is provided on the first surface of the second substrate, a plurality of first detection electrodes are provided on the second surface of the second substrate, a second detection electrode is provided on the first substrate, the first detection electrodes and the driving electrode constitute a capacitance-type first touch panel unit, and the second detection electrode and the driving electrode constitute a capacitance-type second touch panel unit.

Claims

1. An image display device comprising:

a first substrate which has a first surface and a second surface facing the first surface;

a second substrate which has a first surface and a second surface facing the first surface, the first surface being arranged to face the second surface of the first substrate, and is made of a transparent material; and

an image display layer which is arranged between the first substrate and the second substrate,

wherein a driving electrode is provided on the first surface of the second substrate,

a plurality of first detection electrodes are provided on the second surface of the second substrate,

a second detection electrode is provided on the first substrate,

the first detection electrodes and the driving electrode constitute a capacitance-type first touch panel unit, and

the second detection electrode and the driving electrode constitute a capacitance-type second touch panel unit.

5. The image display device according to claim 1,

wherein the driving electrode doubles as an electrode for driving the image display layer.

6. The image display device according to claim 1,

wherein each first detection electrode, the second detection electrode, and the driving electrode are connected to a detection unit, and

the detection unit includes a first capacitor connected in series to a first capacitive unit constituted by the first detection electrode and the driving electrode, and a second capacitor connected in series to a second capacitive unit constituted by the second detection electrode and the driving electrode.

7. The image display device according to claim 6,

wherein the detection unit further includes a first operational amplifier connected in parallel to the first capacitor, and a second operational amplifier connected in parallel to the second capacitor.

8. The image display device according to claim 1,

wherein each first detection electrode, the second detection electrode, and the driving electrode are connected to a detection unit,

the detection unit includes a variable-capacitance capacitor connected in series to a first capacitive unit constituted by the first detection electrode and the driving electrode and a second capacitive unit constituted by the second detection electrode and the driving electrode, and

the capacitance of the capacitor changes between during the detection of the first touch panel unit and during the detection of the second touch panel unit.

9. The image display device according to claim 8,

wherein the detection unit further includes an operational amplifier connected in parallel to the capacitor.

10. The image display device according to claim 1,

wherein each first detection electrode, the second detection electrode, and the driving electrode are connected to a detection unit,

the detection unit includes a capacitor connected in series to a first capacitive unit constituted by the first detection electrode and the driving electrode and a second capacitive unit constituted by the second detection electrode and the driving electrode,

the detection unit further includes an operational amplifier connected in parallel to the capacitor, and

a reference voltage of the operational amplifier changes between during the detection of the first touch panel unit and during the detection of the second touch panel unit.

2. An image display device comprising:

a first substrate which has a first surface and a second surface facing the first surface;

a second substrate which has a first surface and a second surface facing the first surface, the first surface being arranged to face the second surface of the first substrate, and is made of a transparent material; and

an image display layer which is arranged between the first substrate and the second substrate,

wherein a driving electrode is provided on the second surface of the first substrate,

a plurality of first detection electrodes are provided on the second substrate,

a second detection electrode is provided on the first surface of the first substrate,

the first detection electrodes and the driving electrode constitute a capacitance-type first touch panel unit, and

the second detection electrode and the driving electrode constitute a capacitance-type second touch panel unit.

3. An image display device comprising:

a first substrate which has a first surface and a second surface facing the first surface;

a second substrate which has a first surface and a second surface facing the first surface, the first surface being arranged to face the second surface of the first substrate, and is made of a transparent material;

an image display layer which is made of liquid crystal arranged between the first substrate and the second substrate; and

a sheet light source device which is arranged on the first surface of the first substrate,

wherein a driving electrode is provided on the first surface of the second substrate,

a plurality of first detection electrodes are provided on the second surface of the second substrate,

a second detection electrode is provided on the sheet light source device,

the first detection electrodes and the driving electrode constitute a capacitance-type first touch panel unit, and

the second detection electrode and the driving electrode constitute a capacitance-type second touch panel unit.

4. An image display device comprising:

a first substrate which has a first surface and a second surface facing the first surface;

a second substrate which has a first surface and a second surface facing the first surface, the first surface being arranged to face the second surface of the first substrate, and is made of a transparent material;

an image display layer which is made of liquid crystal arranged between the first substrate and the second substrate; and

a sheet light source device which is arranged on the first surface of the first substrate,

wherein a driving electrode is provided on the second surface of the first substrate,

a plurality of first detection electrodes are provided on the second substrate,

a second detection electrode is provided on the sheet light source device,

the first detection electrodes and the driving electrode constitute a capacitance-type first touch panel unit, and

the second detection electrode and the driving electrode constitute a capacitance-type second touch panel unit.