Display device having switching signal line between display regions

1. A display device that is foldable and displays an image by writing a data signal into a plurality of pixel circuits arranged in a display panel, wherein

the display panel includes:

a plurality of data signal lines configured to transmit the data signal;

a plurality of scanning signal lines intersecting the plurality of data signal lines;

the plurality of pixel circuits provided at intersecting portions of the plurality of data signal lines and the plurality of scanning signal lines;

a first display region and a second display region in which the plurality of data signal lines are disposed;

a picture-frame region that encloses the first display region and the second display region;

a data signal line drive circuit configured to apply the data signal to the plurality of data signal lines; and

a scanning signal line drive circuit configured to drive the plurality of scanning signal lines,

the first display region and the second display region are arranged side by side in a direction in which the plurality of data signal lines extend,

the data signal line drive circuit is provided in a region in the picture-frame region so that the data signal is applied to data signal lines disposed in the second display region earlier than data signal lines disposed in the first display region, the region in the picture-frame region being closer to the second display region than to the first display region, and

the display panel further includes:

a first switching signal line disposed between the first display region and the second display region, the first switching signal line extending in parallel to the plurality of scanning signal lines so as to intersect the plurality of data signal lines; and

a plurality of first switching elements provided at intersecting portions of the plurality of data signal lines and the first switching signal line, the plurality of first switching elements each having a control terminal connected to the first switching signal line, a first conductive terminal connected to a data signal line disposed in the first display region, and a second conductive terminal connected to a data signal line disposed in the second display region.

2. The display device according to claim 1 , wherein a bending portion that straddles the first display region and the second display region overlaps the plurality of first switching elements.

3. The display device according to claim 1 , wherein

each of the plurality of data signal lines includes a first data signal line disposed in the first display region, and a second data signal line disposed in the second display region, and

the first data signal line and the second data signal line are connected to each other through a corresponding first switching element.

4. The display device according to claim 3 , wherein

the first conductive terminal of each of the plurality of first switching elements is electrically connected to a corresponding data signal line through a contact hole, and

the second conductive terminal of each of the plurality of first switching elements is electrically connected to a corresponding data signal line through a contact hole.

5. The display device according to claim 1 , wherein semiconductor layers of the plurality of first switching elements are formed in a same layer as semiconductor layers that form the plurality of pixel circuits, and using a same material as the semiconductor layers that form the plurality of pixel circuits.

6. The display device according to claim 1 , wherein the display panel further includes:

a third display region provided on an opposite side to the second display region with respect to the first display region;

a second switching signal line disposed between the first display region and the third display region, the second switching signal line extending in parallel to the plurality of scanning signal lines so as to intersect the plurality of data signal lines;

a plurality of second switching elements provided at intersecting portions of the plurality of data signal lines and the second switching signal line, the plurality of second switching elements each having a control terminal connected to the second switching signal line, a first conductive terminal connected to a data signal line disposed in the third display region, and a second conductive terminal connected to a data signal line disposed in the first display region.

7. The display device according to claim 1 , wherein

writing of the data signal into pixel circuits included in the first display region among the plurality of pixel circuits is performed with the plurality of first switching elements turned on, and

writing of the data signal into pixel circuits included in the second display region among the plurality of pixel circuits is performed with the plurality of first switching elements turned off.

8. The display device according to claim 7 , wherein

when an image is displayed in the first display region and an image is not displayed in the second display region, the plurality of first switching elements are turned on, and

when an image is displayed in the second display region and an image is not displayed in the first display region, the plurality of first switching elements are turned off.

9. The display device according to claim 1 , wherein

the display panel includes k third switching elements per output portion of the data signal line drive circuit, wherein k is an integer greater than or equal to 2,

each output portion of the data signal line drive circuit is connected to k data signal lines through the k third switching elements, and

by the k third switching elements sequentially turned on, each data signal outputted from the data signal line drive circuit is distributed to the k data signal lines.

10. The display device according to claim 1 , wherein

the display device has a first mode in which drive frequency is a first frequency, and a second mode in which drive frequency is a second frequency higher than the first frequency,

the first display region is driven in the first mode, and writing of the data signal into pixel circuits included in the first display region among the plurality of pixel circuits is performed with the plurality of first switching elements turned on, and

the second display region is driven in the second mode, and writing of the data signal into pixel circuits included in the second display region among the plurality of pixel circuits is performed with the plurality of first switching elements turned off.

11. The display device according to claim 1 , wherein

the plurality of scanning signal lines include a plurality of first scanning signal lines disposed in the first display region and a plurality of second scanning signal lines disposed in the second display region, and

plural second scanning signal lines are driven between driving of a first scanning signal line and driving of an adjacent first scanning signal line.

12. The display device according to claim 1 , wherein

the plurality of scanning signal lines include a plurality of first scanning signal lines disposed in the first display region and a plurality of second scanning signal lines disposed in the second display region,

the plurality of scanning signal lines correspond to a first row to an Mth row,

the plurality of second scanning signal lines correspond to the first row to an Nth row,

the plurality of first scanning signal lines correspond to an (N+1)th row to the Mth row, and

after repeating driving of the second scanning signal lines in the first row to the Nth row a plurality of times with the plurality of first switching elements turned off, driving of the first scanning signal lines in the (N+1)th row to the Mth row is performed with the plurality of first switching elements turned on.

13. The display device according to claim 11 , wherein

the scanning signal line drive circuit includes a first scanning signal line drive circuit configured to drive the plurality of first scanning signal lines based on a first start pulse signal and a second scanning signal line drive circuit configured to drive the plurality of second scanning signal lines based on a second start pulse signal, and

when the plurality of first scanning signal lines are driven by the first scanning signal line drive circuit, the plurality of first switching elements are turned on.

14. The display device according to claim 11 , comprising a control circuit configured to output an enable signal that performs control as to whether to allow driving of scanning signal lines, wherein

when the enable signal is at an on level, driving of scanning signal lines is possible, and

regarding Z consecutive vertical scanning periods, in first to (Z−1)th vertical scanning periods, the control circuit maintains the enable signal at an on level only during a period during which the plurality of second scanning signal lines are to be driven, and in a Zth vertical scanning period, the control circuit maintains the enable signal at an on level during both of a period during which the plurality of second scanning signal lines are to be driven and a period during which the plurality of first scanning signal lines are to be driven, wherein Z is an integer greater than or equal to 2.

15. The display device according to claim 11 , wherein

when any of the plurality of first scanning signal lines is driven, the plurality of first switching elements are turned on, and

when any of the plurality of second scanning signal lines is driven, the plurality of first switching elements are turned off.

16. The display device according to claim 1 , wherein a moving image is displayed in the second display region while a still image is displayed in the first display region.