JP2010276665A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device for which electrical inspection is exactly conducted. <P>SOLUTION: The display device includes a plurality of pixel electrodes 10, a plurality of data wires 26, and a plurality of scanning wires 28. The plurality of pixel electrodes 10 include a plurality of effective pixel electrodes 14 in an effective display region 12 and a plurality of dummy pixel electrodes 16 outside the effective display region 12. The plurality of dummy pixel electrodes 16 include first dummy pixel electrodes 22 and second dummy pixel electrodes 24. Each of the plurality of effective pixel electrodes 14 and the first dummy pixel electrodes 22 is controlled so as to be switched between a voltage of some data wire 26 and another voltage by a scanning signal input to some scanning wire 28. The second dummy pixel electrode 24 is disconnected from control by the scanning signal. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display device.

  The display device includes a large number of pixels, and a large number of elements and a large number of wirings are formed to drive each pixel. Conventionally, electrical inspection has been performed by driving pixels (Patent Document 1).

JP 2003-215191 A

  In the electrical inspection, whether or not the pixel is driven correctly is inspected, and therefore it is necessary to correctly recognize the position of the pixel. For this reason, in the coordinate system of the inspection apparatus, it is necessary to place the inspection object at an accurate position, but this is difficult.

  An object of this invention is to provide the display apparatus which can perform an electrical test | inspection correctly.

  (1) A display device according to the present invention includes a plurality of pixel electrodes, a plurality of data lines, and a plurality of scanning lines, and the plurality of pixel electrodes includes a plurality of effective pixel electrodes in an effective display area. A plurality of dummy pixel electrodes outside the effective display area, the plurality of dummy pixel electrodes including a first dummy pixel electrode and a second dummy pixel electrode, and the plurality of effective pixel electrodes and Each of the first dummy pixel electrodes is controlled to be switched between the voltage of any one of the data wirings and the other voltage by a scanning signal input to any of the scanning wirings, and the second dummy pixel electrode is , And is disconnected from the control by the scanning signal. According to the present invention, since the second dummy pixel electrode that is driven differently from the effective pixel electrode is arranged outside the effective display area, the position of the display device can be specified by using this as a mark. Thereby, electrical inspection can be performed accurately.

  (2) In the display device described in (1), the display device further includes a plurality of switching elements, and each of the plurality of effective pixel electrodes and the first dummy pixel electrode is connected via any one of the switching elements. Any of the data lines is electrically connected, the plurality of scanning lines are electrically connected to control the plurality of switching elements, respectively, and the second dummy pixel electrode It may be characterized by being electrically connected to the data wiring.

  (3) In the display device described in (1), the display device further includes a plurality of switching elements, and each of the plurality of pixel electrodes is electrically connected to the plurality of data lines through the plurality of switching elements. The plurality of scan lines are electrically connected so as to control the plurality of switching elements, and the second dummy pixel electrode is electrically connected to any one of the scan lines. This may be a feature.

  (4) The display device described in (1) further includes a plurality of switching elements and a common electrode facing the plurality of pixel electrodes, and each of the plurality of pixel electrodes includes the plurality of switching elements. An element is electrically connected to the plurality of data lines, the plurality of scan lines are electrically connected to control the plurality of switching elements, and the second dummy pixel electrode is It may be electrically connected to the common electrode.

  (5) In the display device described in (1), the display device further includes a plurality of switching elements, and each of the plurality of effective pixel electrodes and the first dummy pixel electrodes is connected via any one of the switching elements. The plurality of scanning wirings are electrically connected to control any of the plurality of switching elements, and the second dummy pixel electrode is electrically connected to any one of the data wirings. The wiring and the plurality of scanning wirings may be electrically disconnected from each other.

  (6) In the display device described in any one of (1) to (5), the plurality of dummy pixel electrodes are arranged in a first region and a second region sandwiching the effective display region, and Both the first dummy pixel electrode and the second dummy pixel electrode may be arranged in at least one of the first region and the second region.

  (7) In the display device according to (6), at least three of the pair of the dummy pixel electrodes farthest in the first region and the pair of the dummy pixel electrodes farthest in the second region The pixel electrodes may be the same one of the first dummy pixel electrode and the second dummy pixel electrode.

  (8) In the display device described in (6) or (7), each of the pixel electrodes has a long shape in one direction, and the plurality of pixel electrodes are arranged so that their longitudinal directions are parallel to each other. In each of the first region and the second region, the plurality of dummy pixel electrodes may be arranged in a line parallel to the longitudinal direction.

  (9) In the display device described in any one of (1) to (5), the plurality of dummy pixel electrodes are arranged in a region surrounding the effective display region, and the effective display region has a rectangular shape. At least three of the four dummy pixel electrodes located next to the four corners of the rectangle and on the extension of the diagonal line of the rectangle are all the first dummy pixel electrode and the second dummy pixel electrode. One of the pixel electrodes may be the same one.

  (10) In the display device described in any one of (1) to (5), the plurality of dummy pixel electrodes include a first column closest to the effective display area, and the first column closer to the effective display region. A plurality of columns including a second column separated from the effective display area, wherein both the first dummy pixel electrode and the second dummy pixel electrode are arranged in the first column, and the second column is arranged in the second column. May be characterized in that only the first dummy pixel electrode is arranged.

  (11) In the display device described in any one of (1) to (5), the plurality of dummy pixel electrodes include a first column closest to the effective display area, and the first column closer to the effective display region. And a second column separated from the effective display area, wherein only the first dummy pixel electrode is disposed in the first column, and the first dummy pixel electrode is disposed in the second column. And the second dummy pixel electrode may be disposed.

1 is a schematic diagram showing a display device according to a first embodiment of the present invention. It is a figure which shows the detail of an effective pixel electrode and its peripheral region. It is a figure which shows the detail of a 2nd dummy pixel electrode and its peripheral region. It is a figure which shows the detail of the modification 1 of a 2nd dummy pixel electrode and its peripheral region. It is a figure which shows the detail of the modification 2 of a 2nd dummy pixel electrode and its peripheral region. It is a figure which shows the detail of the modification 3 of a 2nd dummy pixel electrode and its peripheral region. It is the schematic which shows the display apparatus which concerns on the 2nd Embodiment of this invention. It is the schematic which shows the display apparatus which concerns on the 3rd Embodiment of this invention. It is the schematic which shows the display apparatus which concerns on the 4th Embodiment of this invention. It is the schematic which shows the display apparatus which concerns on the 5th Embodiment of this invention. It is the schematic which shows the display apparatus which concerns on the 6th Embodiment of this invention. It is the schematic which shows the display apparatus which concerns on the 7th Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment]
FIG. 1 is a schematic view showing a display device according to a first embodiment of the present invention. An example of a liquid crystal display panel will be described as a display device. The display device shown in FIG. 1 is a mother panel for cutting out into a plurality of liquid crystal display panels. The liquid crystal display panel has a pair of substrates (for example, a glass substrate), and a liquid crystal is interposed between them. One substrate is a thin film transistor (TFT) substrate (or array substrate) including a thin film field effect transistor, pixel electrodes, wirings, and the like. The other substrate is a color filter substrate.

  In this embodiment, the driving method of the liquid crystal display panel is assumed to be an IPS (In Plane Switching) method. Other methods may be applied, and electrodes and wirings corresponding to the method are formed. The display device is not limited to the liquid crystal display panel, and may be an electroluminescence display device.

  The display device includes a plurality of pixel electrodes 10 in a region to be an individual liquid crystal display panel. In FIG. 1, for the sake of explanation, the pixel electrode 10 is enlarged and other elements are omitted. The plurality of pixel electrodes 10 include a plurality of effective pixel electrodes 14 in the effective display area 12 and a plurality of dummy pixel electrodes 16 outside the effective display area 12. The plurality of dummy pixel electrodes 16 are arranged in the first region 18 and the second region 20 that sandwich the effective display region 12. When the effective display area 12 is rectangular, there are a first area 18 and a second area 20 on both sides of a pair of parallel short sides. The dummy pixel electrode 16 is not disposed in the regions on both sides of the pair of long sides.

  The plurality of dummy pixel electrodes 16 includes a first dummy pixel electrode 22 and a second dummy pixel electrode 24. In at least one of the first region 18 and the second region 20, both the first dummy pixel electrode 22 and the second dummy pixel electrode 24 are disposed. In the present embodiment, the effective pixel electrode 14 and the first dummy pixel electrode 22 are controlled in the same manner, but the second dummy pixel electrode 24 is controlled to be different from these.

  FIG. 2 is a diagram showing details of the effective pixel electrode 14 and its peripheral region. The display device includes a plurality of data lines 26 and a plurality of scanning lines 28. The display device has a plurality of switching elements 30. The switching element 30 is a field effect transistor including a semiconductor layer 32, a source electrode 34 and a drain electrode 36, and a gate electrode 38 that is a part of the scanning wiring 28. The plurality of scanning wirings 28 are electrically connected so as to control the plurality of switching elements 30, respectively. The effective pixel electrode 14 is controlled so as to be switched between the voltage of one of the data lines 26 and the other voltage by a scanning signal input to the scanning line 28. The plurality of effective pixel electrodes 14 are electrically connected to any one of the data lines 26 via any one of the switching elements 30.

  In the IPS system according to the present embodiment, the effective pixel electrode 14 electrically connected to the data wiring 26 and the common electrode 42 electrically connected to the common wiring 40 cause a lateral direction relative to the substrate. The electric field is generated to drive the liquid crystal. The first dummy pixel electrode 22 shown in FIG. 1 has the same electrical connection so as to be controlled in the same manner as the effective pixel electrode 14.

  FIG. 3 is a diagram showing details of the second dummy pixel electrode 24 and its peripheral region. The second dummy pixel electrode 24 is disconnected from the control by the scanning signal. For example, in the dummy switching element 44 shown in FIG. 3, the first electrode 46 and the second electrode 48 corresponding to the source electrode 34 and the drain electrode 36 shown in FIG. It has become. The second dummy pixel electrode 24 is electrically connected to the data line 26. Therefore, the voltage of the data wiring 26 is applied to the second dummy pixel electrode 24 regardless of the scanning signal of the scanning wiring 28.

  According to the present embodiment, as shown in FIG. 1, the second dummy pixel electrode 24 that is driven differently from the effective pixel electrode 14 is disposed outside the effective display area 12, and this is used as a mark. Thus, the position of the display device can be specified. Thereby, electrical inspection can be performed accurately.

  For example, a scanning signal is input to the scanning wiring 28 so that the plurality of pixel electrodes 10 are switched from off to on. Since the effective pixel electrode 14 and the first dummy pixel electrode 22 are driven in the same manner, both of the effective pixel electrode 14 and the first dummy pixel electrode 22 are changed from an off voltage when disconnected from the data wiring 26 to an on voltage (voltage of the data wiring 26). Change. On the other hand, the second dummy pixel electrode 24 is already electrically connected to the data line 26 in the off state even when a scan signal is input to the scan line 28 so as to switch from off to on. The voltage of the data wiring 26 remains unchanged. Therefore, the second dummy pixel electrode 24 can be detected by detecting a change in voltage with a sensor. If the position is specified, the second dummy pixel electrode 24 can be used as a positioning mark. it can. With this mark, the display device can be arranged at a correct position with respect to the inspection device, or a positional deviation of the display device with respect to the inspection device can be corrected, and an accurate electrical inspection can be performed.

[Modification]
In the example shown in FIG. 1, the plurality of dummy pixel electrodes 16 includes a plurality of first dummy pixel electrodes 22 and one second dummy pixel electrode 24. Then, one second dummy pixel electrode 24 is identified by comparing with the remaining pixel electrodes 10 (the plurality of effective pixel electrodes 14 and the plurality of first dummy pixel electrodes 22), and the second dummy pixel electrode 24 is marked. It is used as. As a modification, the plurality of dummy pixel electrodes 16 may be composed of one first dummy pixel electrode 22 and a plurality of second dummy pixel electrodes 24. In that case, the plurality of second dummy pixel electrodes 24 are identified by comparing with the remaining pixel electrodes 10 (the plurality of effective pixel electrodes 14 and one first dummy pixel electrode 22), and the plurality of dummy pixel electrodes 16 are identified. An electrode excluding the plurality of second dummy pixel electrodes 24 (that is, the first dummy pixel electrode 22) may be used as a mark. Even in this case, it is the first dummy pixel electrode 22 that directly becomes the positioning mark, but the second dummy pixel electrode 24 is used to calculate the position of the first dummy pixel electrode 22. The electrode 24 is also indirectly used as a mark.

  In the example shown in FIG. 1, the display device is a mother panel for cutting out into a plurality of liquid crystal display panels, and includes a plurality of effective display areas 12. One second dummy pixel electrode 24 is arranged corresponding to each effective display area 12. Accordingly, the display device as a whole includes a plurality of second dummy pixel electrodes 24. As a modification, when the display device includes only one effective display region 12, it is preferable to arrange a plurality of second dummy pixel electrodes 24 corresponding to the one effective display region 12.

  FIG. 4 is a diagram showing details of Modification 1 of the second dummy pixel electrode and its peripheral region. In this example, the plurality of pixel electrodes including the second dummy pixel electrode 124 are electrically connected to the plurality of data lines 26 via the plurality of switching elements 30, respectively. The plurality of scanning wirings 28 are electrically connected so as to control the plurality of switching elements 30, respectively. The second dummy pixel electrode 124 is electrically connected to the scanning wiring 28 and is different from the first embodiment described above. According to this, since the voltage of the scanning signal of the scanning wiring 28 appears in the second dummy pixel electrode 124 regardless of the control of the switching element 30, the effective pixel electrode (not shown) in which the voltage of the data wiring 26 appears and It can be distinguished from a first dummy pixel electrode (not shown).

  FIG. 5 is a diagram showing details of Modification 2 of the second dummy pixel electrode and its peripheral region. In this example, the plurality of pixel electrodes including the second dummy pixel electrode 224 are electrically connected to the plurality of data lines 26 via the plurality of switching elements 30, respectively. The plurality of scanning wirings 28 are electrically connected so as to control the plurality of switching elements 30, respectively. The second dummy pixel electrode 224 is different from the first embodiment described above in that the second dummy pixel electrode 224 is electrically connected to the common electrode 42 through the through hole 250. According to this, since the voltage of the common electrode 42 appears in the second dummy pixel electrode 224 regardless of the control of the switching element 30, the effective pixel electrode (not shown) and the first dummy in which the voltage of the data line 26 appears. It can be distinguished from a pixel electrode (not shown).

  FIG. 6 is a diagram showing details of Modification 3 of the second dummy pixel electrode and its peripheral region. In this example, the second dummy pixel electrode 324 is electrically disconnected from any of the plurality of data lines 26 and the plurality of scan lines 28. For example, in FIG. 2, the effective pixel electrode 14 and the source electrode 34 are electrically connected through the through hole 50, but in FIG. 6, a through hole that connects the second dummy pixel electrode 324 and the source electrode 34 is formed. The second dummy pixel electrode 324 is electrically floating. This is different from the above-described first embodiment. According to this, since the voltage of the second dummy pixel electrode 324 is not controlled by the control of the switching element 30, the effective pixel electrode (not shown) and the first dummy in which the voltage of the data line 26 appears by the control of the switching element 30. It can be distinguished from a pixel electrode (not shown).

[Second Embodiment]
FIG. 7 is a schematic view showing a display device according to the second embodiment of the present invention. In the present embodiment, the plurality of dummy pixel electrodes 416 are arranged in a region surrounding the effective display region 412. The effective display area 412 has a rectangular shape. At least three of the four dummy pixel electrodes 416 located next to the four corners of the rectangle and on the extension of the diagonal line of the rectangle are all the second dummy pixel electrodes 424. The remaining dummy pixel electrodes 416 are all first dummy pixel electrodes 422.

  According to the present embodiment, the length of one side of the effective display area 412 and the length of the other side connected at right angles to the effective display area 412 can be calculated by at least three second dummy pixel electrodes 424. Using this information, the display device can be positioned with high accuracy.

  Note that the first dummy pixel electrode 422 and the second dummy pixel electrode 424 may be interchanged. In that case, the second dummy pixel electrode 424 is detected and the entire dummy pixel electrode 416 excluding the second dummy pixel electrode 424 (that is, the first dummy pixel electrode 422) is used as a direct positioning mark. The second dummy pixel electrode 424 is used as an indirect positioning mark. The details are as described in the first embodiment, and the same applies to the following embodiments.

[Third Embodiment]
FIG. 8 is a schematic view showing a display device according to the third embodiment of the present invention. In the present embodiment, at least three dummy pixel electrodes 516 of the pair of dummy pixel electrodes 516 farthest in the first region 518 and the pair of dummy pixel electrodes 516 farthest in the second region 520 are all 2 dummy pixel electrodes 524. For example, in the first region 518, the dummy pixel electrodes 516 are arranged in a line, and the pair of dummy pixel electrodes 516 located at both ends in the arrangement direction are the second dummy pixel electrodes 524. Also in the second region 520, the dummy pixel electrodes 516 are arranged in a line, and the dummy pixel electrode 516 located at one end in the arrangement direction is the second dummy pixel electrode 524.

  In the above-described second embodiment, since the plurality of dummy pixel electrodes 416 are arranged so as to surround the effective display area 412, a large area is required. On the other hand, in this embodiment mode, the dummy pixel electrode 516 is not disposed in a pair of regions sandwiching the effective display region 512 in a direction orthogonal to the direction between the first region 518 and the second region 520. Therefore, the space can be effectively used.

[Fourth Embodiment]
FIG. 9 is a schematic view showing a display device according to the fourth embodiment of the present invention. In the third embodiment (FIG. 8) described above, a plurality of dummy pixel electrodes 516 are arranged in the first region 518 and the second region 520 respectively located on both sides of the pair of short sides of the rectangular effective display region 512. However, in the present embodiment, a plurality of dummy pixel electrodes 616 are arranged in the first region 618 and the second region 620 that are respectively located on both sides of the pair of long sides of the rectangular effective display region 612. The other configurations correspond to the contents described in the third embodiment.

[Fifth Embodiment]
FIG. 10 is a schematic view showing a display device according to the fifth embodiment of the present invention. In this embodiment, each pixel electrode 710 has a shape that is long in one direction, and the plurality of pixel electrodes 710 are arranged so that their longitudinal directions are parallel to each other. In each of the first region 718 and the second region 720, the plurality of dummy pixel electrodes 716 are arranged in one row parallel to the longitudinal direction. For example, the effective display area 712 is rectangular, and the pixel electrode 710 extends parallel to the long side of the rectangle. A first region 718 and a second region 720 are adjacent to the pair of long sides, and a dummy pixel electrode 716 extends along the long side. The dummy pixel electrode 716 is arranged with the longitudinal direction parallel to the side of the effective display area 712 and the short side direction facing away from the effective display direction. Therefore, the width occupied by each of the first area 718 and the second area 720 outside the effective display area 712 (the width in the direction away from the effective display area 712) can be reduced, and the space can be effectively used. become.

[Sixth Embodiment]
FIG. 11 is a schematic view showing a display device according to the sixth embodiment of the present invention. In the present embodiment, the plurality of dummy pixel electrodes 816 includes a plurality of columns including a first column 852 that is closest to the effective display region 812 and a second column 854 that is farther from the effective display region 812 than the first column 852. Are arranged in For example, the dummy pixel electrodes 816 in the first column 852 are arranged so as to surround the effective display area 812. The dummy pixel electrodes 816 in the second column 854 are arranged so as to surround the dummy pixel electrodes 816 in the first column 852.

  In the first column 852, both the first dummy pixel electrode 822 and the second dummy pixel electrode 824 are arranged. For example, when the effective display area 812 is rectangular, the dummy pixel electrode 816 closest to at least three corners of the four corners of the rectangle is the second dummy pixel electrode 824, and the remaining dummy pixel electrodes 816 are This is a first dummy pixel electrode 822. The dummy pixel electrodes 816 arranged in the second column 854 are all the first dummy pixel electrodes 822.

  According to the present embodiment, since the second dummy pixel electrode 824 is located at a position surrounded by the effective pixel electrode 814 and the first dummy pixel electrode 822, it can be easily compared and easily identified. Is possible.

[Seventh Embodiment]
FIG. 12 is a schematic view showing a display device according to the seventh embodiment of the present invention. In the present embodiment, the plurality of dummy pixel electrodes 916 includes a plurality of columns including a first column 952 that is closest to the effective display region 912 and a second column 954 that is farther from the effective display region 912 than the first column 952. Are arranged in For example, the dummy pixel electrodes 916 in the first column 952 are arranged in each of the first region 918 and the second region 920 that sandwich the effective display region 912. The dummy pixel electrodes 916 in the second column 954 are arranged next to the dummy pixel electrodes 916 in the first column 952 on the side opposite to the effective display area 912.

  In the first column 952, only the first dummy pixel electrode 922 is arranged. In the second column 954, both the first dummy pixel electrode 922 and the second dummy pixel electrode 924 are arranged. For example, in the second row 954 of each of the first region 918 and the second region 920, at least one of the pair of furthest dummy pixel electrodes 916 is the second dummy pixel electrode 924, and the remaining dummy pixel electrodes 916 are the first ones. One dummy pixel electrode 922.

  According to the present embodiment, since the first dummy pixel electrode 922 is disposed between the second dummy pixel electrode 924 and the effective pixel electrode 914, the effective pixel electrode 914 has the voltage of the second dummy pixel electrode 924. Is less affected by Thereby, the measurement of the voltage of the effective pixel electrode 914 and the influence on the display in the effective display area 912 can be suppressed.

  The present invention is not limited to the embodiment described above, and various modifications are possible. For example, the configuration described in the embodiment can be replaced with a substantially the same configuration, a configuration that exhibits the same operational effects, or a configuration that can achieve the same purpose.

  10 pixel electrode, 12 effective display area, 14 effective pixel electrode, 16 dummy pixel electrode, 18 first area, 20 second area, 22 first dummy pixel electrode, 24 second dummy pixel electrode, 26 data wiring, 28 scanning wiring , 30 switching element, 32 semiconductor layer, 34 source electrode, 36 drain electrode, 38 gate electrode, 40 common wiring, 42 common electrode, 44 dummy switching element, 46 1st electrode, 48 2nd electrode, 50 through hole, 124 1st 2 dummy pixel electrode, 224 2nd dummy pixel electrode, 250 through hole, 324 2nd dummy pixel electrode, 412 effective display area, 416 dummy pixel electrode, 422 1st dummy pixel electrode, 424 2nd dummy pixel electrode, 512 effective display Region 516 dummy pixel electrode 518 first region 520 Second region, 524 Second dummy pixel electrode, 612 Effective display region, 616 Dummy pixel electrode, 618 First region, 620 Second region, 710 Pixel electrode, 712 Effective display region, 716 Dummy pixel electrode, 718 First region, 720 second region, 812 effective display region, 814 effective pixel electrode, 816 dummy pixel electrode, 822 first dummy pixel electrode, 824 second dummy pixel electrode, 852 first column, 854 second column, 912 effective display region, 914 Effective pixel electrode, 916 dummy pixel electrode, 918 first region, 920 second region, 922 first dummy pixel electrode, 924 second dummy pixel electrode, 952 first column, 954 second column.

Claims (11)

A plurality of pixel electrodes;
Multiple data wires,
A plurality of scanning wires;
Including
The plurality of pixel electrodes include a plurality of effective pixel electrodes in an effective display area, and a plurality of dummy pixel electrodes outside the effective display area,
The plurality of dummy pixel electrodes include a first dummy pixel electrode and a second dummy pixel electrode,
Each of the plurality of effective pixel electrodes and the first dummy pixel electrode is controlled so as to be switched between the voltage of any one of the data lines and the other voltage by a scanning signal input to any of the scanning lines. ,
The display device, wherein the second dummy pixel electrode is disconnected from the control by the scanning signal. The display device according to claim 1,
A plurality of switching elements;
Each of the plurality of effective pixel electrodes and the first dummy pixel electrode is electrically connected to any of the data wirings via any of the switching elements,
Each of the plurality of scanning lines is electrically connected to control the plurality of switching elements,
The display device, wherein the second dummy pixel electrode is electrically connected to any one of the data lines. The display device according to claim 1,
A plurality of switching elements;
Each of the plurality of pixel electrodes is electrically connected to the plurality of data lines via the plurality of switching elements,
Each of the plurality of scanning lines is electrically connected to control the plurality of switching elements,
The display device, wherein the second dummy pixel electrode is electrically connected to any one of the scanning lines. The display device according to claim 1,
A plurality of switching elements;
A common electrode facing the plurality of pixel electrodes;
Further comprising
Each of the plurality of pixel electrodes is electrically connected to the plurality of data lines via the plurality of switching elements,
Each of the plurality of scanning lines is electrically connected to control the plurality of switching elements,
The display device, wherein the second dummy pixel electrode is electrically connected to the common electrode. The display device according to claim 1,
A plurality of switching elements;
Each of the plurality of effective pixel electrodes and the first dummy pixel electrode is electrically connected to any of the data wirings via any of the switching elements,
Each of the plurality of scanning lines is electrically connected to control the plurality of switching elements,
The display device, wherein the second dummy pixel electrode is electrically disconnected from any of the plurality of data lines and the plurality of scanning lines. The display device according to any one of claims 1 to 5,
The plurality of dummy pixel electrodes are arranged in a first region and a second region sandwiching the effective display region,
The display device, wherein both the first dummy pixel electrode and the second dummy pixel electrode are arranged in at least one of the first region and the second region. The display device according to claim 6,
At least three dummy pixel electrodes of the pair of the dummy pixel electrodes farthest in the first region and the pair of the dummy pixel electrodes farthest in the second region are all the first dummy pixel electrode and A display device, wherein the second dummy pixel electrodes are the same one of the second dummy pixel electrodes. The display device according to claim 6 or 7,
Each of the pixel electrodes has a long shape in one direction,
The plurality of pixel electrodes are arranged so that their longitudinal directions are parallel to each other,
In each of the first region and the second region, the plurality of dummy pixel electrodes are arranged in one row parallel to the longitudinal direction. The display device according to any one of claims 1 to 5,
The plurality of dummy pixel electrodes are arranged in a region surrounding the effective display region,
The effective display area is rectangular,
At least three of the four dummy pixel electrodes located next to the four corners of the rectangle and on the diagonal extension of the rectangle are all the first dummy pixel electrode and the second dummy pixel. A display device, wherein one of the electrodes is the same. The display device according to any one of claims 1 to 5,
The plurality of dummy pixel electrodes are arranged in a plurality of columns including a first column closest to the effective display region and a second column farther from the effective display region than the first column,
In the first column, both the first dummy pixel electrode and the second dummy pixel electrode are disposed,
In the display device, only the first dummy pixel electrode is arranged in the second column. The display device according to any one of claims 1 to 5,
The plurality of dummy pixel electrodes are arranged in a plurality of columns including a first column closest to the effective display region and a second column farther from the effective display region than the first column,
In the first column, only the first dummy pixel electrode is disposed,
In the second column, both the first dummy pixel electrode and the second dummy pixel electrode are arranged.

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