Display device and electronic device
View Patent ↗The present invention provides a display device includes: a pixel array section including a set of pixels arranged in a form of a matrix; and a driving section for driving the pixel array section.
1. A display device comprising:
a pixel array section including a set of pixels arranged in a form of a matrix having columns and rows; and
a driving section for driving the pixel array section;
wherein the pixel array section has signal lines in a column direction arranged at a ratio of one signal line to two pixel columns, first driving lines in a row direction arranged at a ratio of one first driving line to one pixel row, and second driving lines in a form of rows similarly arranged at a ratio of one second driving line to one pixel row,
a signal line is commonly connected to pixels of a corresponding pair of a left column and a right column,
a first driving line is connected to pixels of a corresponding row,
a second driving line is alternately and exclusively connected to odd-numbered pixels in an upper row and even-numbered pixels in a lower row, the second driving line being disposed between the upper row and the lower row,
the driving section includes a horizontal driving circuit for supplying a video signal to the signal lines, a first vertical driving circuit for sequentially supplying a first driving signal to the first driving lines, and a second vertical driving circuit for sequentially supplying a second driving signal to the second driving lines, and
each pixel is operated to emit light at a luminance corresponding to the video signal by the first driving signal and the second driving signal, whereby an image is displayed on the pixel array section.
2. The display device according to claim 1 ,
wherein the pixel array section is scanned during one frame period divided into a first field period and a second field period,
in the first field period, the first vertical driving circuit sequentially scans the first driving lines and supplies a first driving signal to the first driving lines row by row, while the second vertical driving circuit selectively scans one of a group of odd-numbered second driving lines and a group of even-numbered second driving lines and supplies a second driving signal to the one of the groups, whereby half of pixels included in a pair of a left column and a right column commonly connected to each signal line are operated to emit light, and
in the second field period, the first vertical driving circuit sequentially scans the first driving lines and supplies the first driving signal to the first driving lines row by row, while the second vertical driving circuit selectively scans the other of the group of the odd-numbered second driving lines and the group of the even-numbered second driving lines and supplies the second driving signal to the other of the groups, whereby the other half of the pixels included in the pair of the left column and the right column commonly connected to each signal line are operated to emit light.
3. The display device according to claim 2 , wherein one frame period is inserted between a preceding blanking period and a succeeding blanking period.
4. The display device according to claim 1 ,
wherein at least one of the pixels includes a sampling transistor, a driving transistor, a storage capacitor, and a light emitting element,
a control terminal of the sampling transistor is connected to a scanning line formed by one of the first driving line and the second driving line, a pair of current terminals of the sampling transistor is connected to the signal line and a control terminal of the driving transistor, a first current terminal of the driving transistor is connected to the light emitting element, and a second current terminal of the driving transistor is connected to a feeding line formed by the other of the first driving line and the second driving line, and the storage capacitor is connected between the control terminal and the first current terminal of the driving transistor, and
in the pixel, the sampling transistor is turned on in response to a driving signal supplied from the scanning line to sample a video signal from the signal line and write the video signal to the storage capacitor, and the driving transistor operates in response to a driving signal supplied from the feeding line to supply a driving current corresponding to the video signal written to the storage capacitor to the light emitting element.
5. The display device according to claim 4 ,
wherein a correcting operation is performed for a pixel according to the driving signals supplied from the scanning line and the feeding line before writing the video signal to the storage capacitor, whereby the pixel adds an amount of correction for cancelling a variation in threshold voltage of the driving transistor to the storage capacitor.
6. The display device according to claim 5 ,
wherein the correcting operation is repeated a plurality of times on a time division basis.
7. The display device according to claim 6 , wherein the correcting operation is performed over three horizontal periods.
8. The display device according to claim 4 ,
wherein an amount of correction is subtracted for cancelling a variation in mobility of the driving transistor from the storage capacitor when writing the video signal to the storage capacitor.
9. The display device according to claim 6 , wherein a number of the correcting operations is effectively changed between the first field period and the second field period.
10. The display device according to claim 1 , wherein the pixels in the left column and the pixels in the right column are activated at different times.
11. An electronic device comprising:
a display device including a pixel array section including a set of pixels arranged in a form of a matrix having columns and rows; and
a driving section for driving the pixel array section;
wherein the pixel array section has signal lines in a column direction arranged at a ratio of one signal line to two pixel columns, first driving lines in a row direction arranged at a ratio of one first driving line to one pixel row, and second driving lines in a form of rows similarly arranged at a ratio of one second driving line to one pixel row,
a signal line is commonly connected to pixels of a corresponding pair of a left column and a right column,
a first driving line is connected to pixels of a corresponding row,
a second driving line is alternately and exclusively connected to odd-numbered pixels in an upper row and even-numbered pixels in a lower row, the second driving line being disposed between the upper row and the lower row,
the driving section includes a horizontal driving circuit for supplying a video signal to the signal lines, a first vertical driving circuit for sequentially supplying a first driving signal to the first driving lines, and a second vertical driving circuit for sequentially supplying a second driving signal to the second driving lines, and each pixel is operated to emit light at a luminance corresponding to the video signal by the first driving signal and the second driving signal, whereby an image is displayed on the pixel array section.
12. The electronic device according to claim 11 ,
wherein the pixel array section is scanned during one frame period divided into a first field period and a second field period,
in the first field period, the first vertical driving circuit sequentially scans the first driving lines and supplies a first driving signal to the first driving lines row by row, while the second vertical driving circuit selectively scans one of a group of odd-numbered second driving lines and a group of even-numbered second driving lines and supplies a second driving signal to the one of the groups, whereby half of pixels included in a pair of a left column and a right column commonly connected to each signal line are operated to emit light, and
in the second field period, the first vertical driving circuit sequentially scans the first driving lines and supplies the first driving signal to the first driving lines row by row, while the second vertical driving circuit selectively scans the other of the group of the odd-numbered second driving lines and the group of the even-numbered second driving lines and supplies the second driving signal to the other of the groups, whereby the other half of the pixels included in the pair of the left column and the right column commonly connected to each signal line are operated to emit light.
13. The electronic device according to claim 12 , wherein one frame period is inserted between a preceding blanking period and a succeeding blanking period.
14. The electronic device according to claim 11 ,
wherein at least one of the pixels includes a sampling transistor, a driving transistor, a storage capacitor, and a light emitting element,
a control terminal of the sampling transistor is connected to a scanning line formed by one of the first driving line and the second driving line, a pair of current terminals of the sampling transistor is connected to the signal line and a control terminal of the driving transistor, a first current terminal of the driving transistor is connected to the light emitting element, and a second current terminal of the driving transistor is connected to a feeding line formed by the other of the first driving line and the second driving line, and the storage capacitor is connected between the control terminal and the first current terminal of the driving transistor, and
in the pixel, the sampling transistor is turned on in response to a driving signal supplied from the scanning line to sample a video signal from the signal line and write the video signal to the storage capacitor, and the driving transistor operates in response to a driving signal supplied from the feeding line to supply a driving current corresponding to the video signal written to the storage capacitor to the light emitting element.
15. The electronic device according to claim 14 ,
wherein a correcting operation is performed for a pixel according to the driving signals supplied from the scanning line and the feeding line before writing the video signal to the storage capacitor, whereby the pixel adds an amount of correction for cancelling a variation in threshold voltage of the driving transistor to the storage capacitor.
16. The electronic device according to claim 15 ,
wherein the correcting operation is repeated a plurality of times on a time division basis.
17. The electronic device according to claim 16 , wherein the correcting operation is performed over three horizontal periods.
18. The electronic device according to claim 14 ,
wherein an amount of correction is subtracted for cancelling a variation in mobility of the driving transistor from the storage capacitor when writing the video signal to the storage capacitor.
19. The electronic device according to claim 16 , wherein a number of the correcting operations is effectively changed between the first field period and the second field period.
20. The electronic device according to claim 11 , wherein the pixels in the left column and the pixels in the right column are activated at different times.