DISPLAY DEVICE WITH TOUCH DETECTION FUNCTION, ELECTRONIC APPARATUS, AND TOUCH DETECTION DEVICE

• US 20140292712A1
• Filed: 03/13/2014
• Published: 10/02/2014
• Est. Priority Date: 03/29/2013
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Koito, Takeo, Ishizaki, Koji, Kurasawa, Hayato
• Granted Patent: US 9,292,126 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G02B 30/28 involving active lenticular arrays
• 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 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• 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 an aspect, a display device with a touch detection function includes: a variable focus lens unit that includes a first substrate including a first electrode, a second substrate including a second electrode, and a variable focus layer that is provided between the first substrate and the second substrate; a display unit including a display region that displays an image via the variable focus lens unit; a drive electrode that is arranged in the display unit or at a position opposed to the display region, and divided into a plurality of pieces; and a touch detection unit configured to detect a position of a proximity object using one of the first electrode and the second electrode as a touch detection electrode based on change in capacitance with respect to the drive electrode.

Claims

1. A display device with a touch detection function comprising:

a variable focus lens unit that includes

a first substrate including a first electrode,

a second substrate including a second electrode, and

a variable focus layer that is provided between the first electrode side of the first substrate and the second electrode side of the second substrate and in which a refractive index of transmitted light varies depending on a certain signal applied between the first electrode and the second electrode;

a display unit including a display region that displays an image via the variable focus lens unit;

a drive electrode that is arranged in the display unit or at a position opposed to the display region, and divided into a plurality of pieces; and

a touch detection unit configured to detect a position of a proximity object using one of the first electrode and the second electrode as a touch detection electrode based on change in capacitance with respect to the drive electrode.

2. The display device with a touch detection function according to claim 1, wherein

a plurality of pixel electrodes are arranged in the display region, and

the display unit applies a display driving voltage between the pixel electrodes and the drive electrode based on an image signal to exhibit an image display function.

3. The display device with a touch detection function according to claim 1, wherein,

when the touch detection unit is performing detection using one of the first electrode and the second electrode as the touch detection electrode,

the other one of the first electrode and the second electrode is in a floating state in which an electric potential thereof is not fixed.

4. The display device with a touch detection function according to claim 1, wherein,

when one of the first electrode and the second electrode serves as the touch detection electrode,

the other one of the first electrode and the second electrode serves as the drive electrode.

5. The display device with a touch detection function according to claim 1, wherein

one of the first electrode and the second electrode that serves as the touch detection electrode is a plurality of divided electrode patterns, and

part of the electrode patterns that are arranged in a predetermined pitch is coupled to the touch detection unit.

6. The display device with a touch detection function according to claim 5, wherein ends of the electrode patterns coupled to the touch detection unit are conductive with each other.

7. The display device with a touch detection function according to claim 3, wherein

a direction in which the one of the first electrode and the second electrode extends differs from a direction in which the other one of the first electrode and the second electrode extends, and

the direction in which the other one of the first electrode and the second electrode extends is parallel to a direction in which the divided drive electrode extends.

8. The display device with a touch detection function according to claim 1, wherein

one of the first electrode and the second electrode includes a first conductive pattern and a second conductive pattern that are divided into a plurality of pieces and arranged in a matrix, and

the touch detection unit is configured to detect position of a proximity object using the first conductive pattern as the touch detection electrode and the second conductive pattern as the drive electrode.

9. The display device with a touch detection function according to claim 1, wherein

a plurality of pixels are arranged in the display region,

at least one of the first electrode and the second electrode is divided into a plurality of conductor patterns, and

a direction in which the conductor patterns extend traverses part of the pixels and has an angle with respect to a direction in which the pixels are arranged.

10. The display device with a touch detection function according to claim 1, wherein the drive electrode is driven with an effective voltage value or less of the certain signal.

11. The display device with a touch detection function according to claim 1, wherein the variable focus lens unit switches three-dimensional display and two-dimensional display of the image.

13. An electronic apparatus comprising:

the display device with a touch detection function according to claim 1.

12. A display device with a touch detection function comprising:

a variable focus lens unit that includes

a first substrate including a first electrode,

a second substrate including a second electrode, and

a variable focus layer that is provided between the first electrode side of the first substrate and the second electrode side of the second substrate and in which a refractive index of transmitted light varies depending on a certain signal applied between the first electrode and the second electrode;

a display unit including a display region that displays an image via the variable focus lens unit;

a drive electrode that is arranged in the display unit or at a position opposed to the display region, and divided into a plurality of pieces;

a touch detection electrode that is divided into a plurality of pieces; and

a touch detection unit configured to detect a position of a proximity object using one of the first electrode and the second electrode as the drive electrode based on change in capacitance between the touch detection electrode and the drive electrode, wherein

each of the first electrode and the second electrode is divided,

a direction in which the first electrode extends is parallel to a direction in which the second electrode extends, and

a width of one of the first electrode and the second electrode to which a common potential for variable focus is applied is enlarged.

14. A touch detection device comprising:

a variable focus lens unit that includes

a first substrate including a first electrode,

a second substrate including a second electrode, and

a variable focus layer that is provided between the first electrode side of the first substrate and the second electrode side of the second substrate and in which a refractive index of transmitted light varies depending on a certain signal applied between the first electrode and the second electrode;

a drive electrode that is divided into a plurality of pieces; and

a touch detection unit configured to detect a position of a proximity object using one of the first electrode and the second electrode as a touch detection electrode based on change in capacitance with respect to the drive electrode, wherein,

when one of the first electrode and the second electrode serves as the touch detection electrode,

the other one of the first electrode and the second electrode serves as the drive electrode.