Display device, display device driving method, and electronic apparatus
View Patent ↗A display device includes a pixel array portion and a driving portion for driving the pixel array portion. The pixel array portion includes row scanning lines, column signal lines, and pixels arranged in a matrix form at intersections of the scanning lines and the signal lines. The driving portion includes a write scanner for supplying a control signal to each of the scanning lines by sequentially scanning the scanning lines in each field and a signal selector for supplying a video signal to each of the signal lines in synchronization with the sequential scanning. The pixels each includes a storage capacitor, a light-emitting element, a sampling transistor for being turned on in response to the control signal, sampling the video signal, and storing the video signal in the storage capacitor, and a drive transistor for supplying a driving current to the light-emitting element in accordance with the stored video signal.
1. A display device comprising:
a pixel array portion; and
a driving portion configured to drive the pixel array portion,
the pixel array portion including row scanning lines, column signal lines, and pixels arranged in a matrix form, the driving portion including at least a write scanner configured to supply a control signal to each of the row scanning lines and a signal selector configured to supply a video signal and a predetermined potential to each of the column signal lines,
each of the pixels comprising:
a storage capacitor;
a light-emitting element;
a first transistor configured to be turned on in response to the control signal and to supply the video signal from one of the column signal lines to the storage capacitor; and
a second transistor configured to supply a driving current to the light-emitting element depending on the video signal stored in the storage capacitor,
wherein the storage capacitor is connected to a control terminal of the second transistor, and
wherein the first transistor is configured to obtain the predetermined potential from one of the column signal lines in response to the control signal supplied from the write scanner and to apply the predetermined potential to the control terminal of the second transistor to switch to a non-light-emission period from a light-emission period, and
wherein the first transistor is configured to be turned on at a beginning of the non-light emission period, to be turned off before a threshold correction period, to be turned on again at a beginning of a signal writing period and to be turned off again at a beginning of the light-emission period.
2. The display device according to claim 1 ,
wherein the storage capacitor is connected between the control terminal of the second transistor and a current terminal of the second transistor in each of the pixels.
3. The display device according to claim 2 ,
wherein each of the pixels is configured to correct a threshold voltage of the second transistor by passing a current to the second transistor until the second transistor is cut off before the video signal is sampled, to obtain a voltage between the control terminal of the second transistor and the current terminal of the second transistor when the second transistor is cut off, and to store the voltage in the storage capacitor.
4. The display device according to claim 2 ,
wherein each of the pixels is configured to correct a mobility of the second transistor by negatively feeding back the driving current flowing through the second transistor to the storage capacitor for a predetermined correction period when the first transistor is turned on and the video signal is stored in the storage capacitor.