Drive method of display device
View Patent ↗A drive method of a display device includes the steps of: performing threshold voltage cancel processing at least once, which changes a potential of a second node of a display device toward a potential obtained by subtracting a threshold voltage of a drive transistor from a potential of a first node by applying a given drive voltage to one source/drain region of the drive transistor from a feeding line while maintaining the potential of the first node; and then, performing writing processing which applies a video signal to the first node from a data line through a write transistor, wherein the sum of lengths of periods in which the threshold voltage cancel processing is performed is so set as to be shorter as a frame frequency becomes higher.
1. A display device comprising:
a plurality of pixel circuits, each of the plurality of pixel circuits including a light emitting element, a write transistor, a drive transistor and a capacitor,
wherein the drive transistor is configured to, in a threshold voltage cancel processing period, flow a correction current to the capacitor while the write transistor is supplying a reference potential from a video signal line, and
wherein a length of the threshold voltage cancel processing period is set so as to be shorter as a frame frequency becomes higher wherein the length of the threshold voltage cancel processing period is adjusted by changing a width of a scanning pulse corresponding to the threshold voltage cancel processing period without changing a width of a scanning pulse corresponding to the video signal writing period.
2. An electronic apparatus comprising the display device of claim 1 .
3. A display device comprising:
at least one sub-pixel that includes a light emitting element, a write transistor, a drive transistor and a capacitor;
a control circuit configured to:
perform a threshold voltage cancel processing operation comprising causing the drive transistor to flow a correction current to the capacitor while the write transistor is supplying a reference potential from a video signal line, and
adjust a per-frame-period aggregate amount of time that the threshold voltage cancel processing operation is performed based on a change in frame frequency without affecting a duration of a video signal writing operation.
4. The display device of claim 3 ,
wherein the control circuit is configured to perform the threshold voltage cancel processing operation multiple times each frame period, and
the per-frame-period aggregate amount of time that the threshold voltage cancel processing operation is performed is adjusted by at least one of:
adjusting durations of individual performances of the threshold voltage cancel processing operation in the frame period; and
adjusting a number of times the threshold voltage cancel processing operation is performed in the frame period.
5. The display device of claim 4 ,
wherein the per-frame-period aggregate amount of time that the threshold voltage cancel processing operation is performed is adjusted by at least adjusting a number of times the threshold voltage cancel processing operation is performed in the frame period.
6. The display device of claim 4 ,
wherein the per-frame-period aggregate amount of time that the threshold voltage cancel processing operation is performed is adjusted by a combination of:
adjusting durations of individual performances of the threshold voltage cancel processing operation in the frame period; and
adjusting a number of times the threshold voltage cancel processing operation is performed in the frame period.
7. An electronic apparatus comprising the display device of claim 3 .
8. A method of operating a display device that includes at least one sub-pixel that includes a light emitting element, a write transistor, a drive transistor and a capacitor, the method comprising:
performing a threshold voltage cancel processing operation comprising causing the drive transistor to flow a correction current to the capacitor while the write transistor is supplying a reference potential from a video signal line, and
adjust a per-frame-period aggregate amount of time that the threshold voltage cancel processing operation is performed based on a change in frame frequency without affecting a duration of a video signal writing operation.
9. The method of claim 8 , further comprising:
performing the threshold voltage cancel processing operation multiple times each frame period,
wherein the per-frame-period aggregate amount of time that the threshold voltage cancel processing operation is performed is adjusted by at least one of:
adjusting durations of individual performances of the threshold voltage cancel processing operation in the frame period; and
adjusting a number of times the threshold voltage cancel processing operation is performed in the frame period.
10. The method of claim 9 ,
wherein the per-frame-period aggregate amount of time that the threshold voltage cancel processing operation is performed is adjusted by at least adjusting a number of times the threshold voltage cancel processing operation is performed in the frame period.
11. The method of claim 9 ,
wherein the per-frame-period aggregate amount of time that the threshold voltage cancel processing operation is performed is adjusted by a combination of:
adjusting durations of individual performances of the threshold voltage cancel processing operation in the frame period; and
adjusting a number of times the threshold voltage cancel processing operation is performed in the frame period.