Display device with touch detection function
A display device including a display section having a plurality of pixel electrodes; and a plurality of drive electrodes extending in a first direction and arranged side-by-side in a second direction. Each of the drive electrodes has a width in the second direction corresponding to a size of the two or more pixel electrodes, and has one or more slits extending in the first direction.
1. A display device with a touch detection function, comprising:
a pixel substrate;
an opposed substrate facing the pixel substrate;
a liquid crystal layer between the pixel substrate and the opposed substrate;
a plurality of drive electrodes carried by the opposed substrate, the drive electrodes extending in a first direction and being arranged side-by-side in a second direction, each drive electrode having one or more inner-electrode slits extending in the first direction, adjacent drive electrodes having a respective inter-electrode slit between them, the plurality of drive electrodes spanning an entire effective display area in the second direction;
a plurality of pixel electrodes arranged in a matrix in the effective display area and facing the drive electrodes;
an electrode pattern carried by the opposed substrate and that allows an electrostatic capacitance to be formed between the electrode pattern and the drive electrodes; and
a polarizer carried by the opposed substrate and provided on the electrode pattern,
wherein,
a slit pitch is a first spacing which is a distance in the second direction between inner-electrode slits that are adjacent to each other, or a second spacing which is a distance in the second direction between an inner-electrode slit and an inter-electrode slit that are adjacent to each other,
the slit pitch has a constant predetermined length,
each drive electrode has a first end area at one end of the drive electrode and a second end area at another end of drive electrode in the first direction,
the first end area and the second end area are disposed outside of the effective display area,
the first end area has a first connection structure conductive potion that couples the first end area to wiring on the pixel substrate,
the second end area has a second connection structure conductive potion that couples the second end area to the wiring, and
each drive electrode is supplied with a potential via the first conductive portion and the second conduct portion of the drive electrode.
2. The display device according to claim 1 , further comprising an image signal wiring and a drive signal wiring on the pixel substrate, the image signal wiring extending in the second direction and connected to supply the pixel electrodes with an image signal, and the drive signal wiring connected to supply the drive electrodes with a drive signal,
wherein non-slit portions are disposed at an intersection, as viewed from the opposed substrate, of an inner-electrode slit and the image signal wiring.
3. The display device according to claim 1 , wherein:
each of the drive electrodes has a length in the first direction greater than that of an effective display region in a display section, and
the inner-electrode slit is provided at least in an effective display region.
4. The display device according to claim 1 , wherein the slit pitch is about 500 micrometers or less.
5. The display device according to claim 4 , wherein the slit pitch is about 300 micrometers or less.
6. The display device according to claim 1 , wherein:
the opposed substrate includes a glass substrate and a color filter that is formed on a liquid crystal layer facing side of the opposed substrate, and
the drive electrodes are provided on the color filter.
7. The display device according to claim 1 , wherein:
the pixel substrate includes a TFT (Thin-Film Transistor) substrate serving as a circuit board,
the first connection structure conductive portion is a first conductive pillar,
the second connection structure conductive portion is a second conductive pillar,
each drive electrode is coupled electrically to the TFT substrate through the first conductive pillar connected to the first end area of the drive electrode and through the second conductive pillar connected to the second end area of the drive electrode.
8. The display device according to claim 1 , wherein:
the drive electrodes are supplied with an alternating current (AC) waveform for touch detection in a first period, and
the drive electrodes are supplied with a common signal for display in a second period different from the first period.
9. The display device according to claim 1 , further comprising a drive electrode driver, wherein:
the pixel substrate includes a thin-film transistor (TFT) substrate serving as a circuit board,
the drive electrode driver is disposed on a liquid crystal layer side of the TFT substrate, and
the drive electrodes are coupled with the drive electrode driver.
10. A display device, comprising:
a pixel substrate;
an opposed substrate facing the pixel substrate;
a liquid crystal layer between the pixel substrate and the opposed substrate;
a plurality of drive electrodes carried by the opposed substrate, the drive electrodes extending in a first direction and arranged side-by-side in a second direction, each of the drive electrodes having one or more inner-electrode slits extending in the first direction, adjacent drive electrodes having a respective inter-electrode slit between them, the plurality of drive electrodes spanning an entire effective display area in the second direction;
a plurality of pixel electrodes that are arranged in a matrix and that face the drive electrodes;
an electrode pattern that is carried by the opposed substrate and that allows an electrostatic capacitance to be formed between the electrode pattern and the drive electrodes; and
a polarizer that is carried by the opposed substrate and provided on the electrode pattern,
wherein,
a slit pitch is a first spacing which is a distance in the second direction between inner-electrode slits that are adjacent to each other, or a second spacing which is a distance in the second direction between an inner-electrode slit and an inter-electrode slit that are adjacent to each other,
the slit pitch has a constant predetermined length,
each drive electrode has a first end area at one end of the drive electrode and a second end area at another end of the drive electrode in the first direction,
the first end area is disposed outside the effective display area and has a first width in the second direction,
the second end area is disposed outside the effective display area and has a second width in the second direction, and
each drive electrode is supplied with a potential via a first connection structure conductive portion positioned in a middle of the first width of the first end area in the second direction and a second connection structure conductive portion positioned in a middle of the second width of the second end area in the second direction of the drive electrode.
11. The display device according to claim 10 , further comprising an image signal wiring and a drive signal wiring on the pixel substrate, the image signal wiring extending in the second direction and connected to supply the pixel electrodes with an image signal, and the drive signal wiring connected to supply the drive electrodes with a drive signal,
wherein non-slit portions are disposed at an intersection, as viewed from the opposed substrate, of an inner-electrode slit and the image signal wiring.
12. The display device according to claim 10 , wherein:
each of the drive electrodes has a length in the first direction larger than that of an effective display region in a display section, and
an inner-electrode slit is provided at least in the effective display region.
13. The display device according to claim 10 , wherein:
one or both of a first spacing and a second spacing have a dimension of about 500 micrometers or less, the first spacing representing a distance in the second direction between adjacent inner-electrode slits and the second spacing representing a distance in the second direction between an inner-electrode slit and an inter-electrode slit which are adjacent to each other.
14. The display device according to claim 13 , wherein one of the first spacing or the second spacing has or both of the first spacing and the second spacing have a dimension of about 300 micrometers or less.
15. The display device according to claim 10 , wherein:
the opposed substrate includes a glass substrate and, a color filter that is formed on a liquid crystal layer facing side of the opposed substrate, and
the drive electrodes are provided on the color filter.
16. The display device according to claim 10 , wherein:
the pixel substrate includes a TFT (Thin-Film Transistor) substrate serving as a circuit board,
the first connection structure conductive portion is a first conductive pillar,
the second connection structure conductive portion is a second conductive pillar,
and
each of drive electrodes are coupled electrically to the TFT substrate through the first conductive pillar connected to the first end area and through the second conductive pillar connected to the second end area.
17. A display device with a touch detection function, comprising:
a pixel substrate;
an opposed substrate facing the pixel substrate;
a liquid crystal layer between the pixel substrate and the opposed substrate;
a plurality of drive electrodes carried by the opposed substrate, the drive electrodes extending in a first direction and being arranged side-by-side in a second direction with adjacent drive electrodes being spaced apart by a gap, the drive electrodes spanning an entire effective display area in the second direction;
a plurality of pixel electrodes arranged in a matrix in an effective display area and facing the drive electrodes;
an electrode pattern carried by the opposed substrate and that allows an electrostatic capacitance to be formed between the electrode pattern and the drive electrodes; and
wherein,
each drive electrode has a first end area at one end of the drive electrode and a second end area at another end of the drive electrode in the first direction,
the first end area and the second end area are disposed outside of the effective display area,
the first end area has a first connection structure conductive potion that couples the first end area to a wiring on the pixel substrate,
the second end area has a second connection structure conductive potion that couples the second end area to the wiring, and
each drive electrode is supplied with a potential via both of the first connection structure conductive portion and the second connection structure conduct portion of the drive electrode.