Display apparatus, driving method of display apparatus and electronic equipment
View Patent ↗Prior to increasing the voltage level of an input signal to be sampled in a step-by-step manner and writing a signal voltage Vsig at a desired voltage level, a precharge is performed which writes a precharge voltage Vpre, lower than the signal voltage Vsig, so as to apply the same voltage Vpre to the gate of a drive transistor in advance. This not only provides a reduced gate-to-source voltage of the drive transistor at the time of writing of the signal voltage Vsig but also extends a mobility correction time required for a mobility correction operation. The extension of the mobility correction time required for the mobility correction operation ensures a relatively smaller variation in the correction time, thus suppressing the variation in brightness. The extension also permits a write pulse to be set to the optimal pulse width.
1. A display apparatus comprising:
a pixel array section including a plurality of pixels, at least one of the plurality of pixels having a light-emitting element, a write transistor configured to write an input signal voltage from a signal line to a holding capacitance during a write period, and a drive transistor configured to drive the light-emitting element based on the input signal voltage held by the holding capacitance;
a drive circuit configured to supply the input signal voltage via the signal lines to the plurality of pixels, wherein
within a horizontal scanning period, a potential of the signal line is iteratively increased from an offset voltage, to a pre-charge voltage between the offset voltage and the input signal voltage, and then to the input signal voltage, an increase to the pre-charge voltage occurring before the write transistor is turned on to write the input signal voltage, and
at least one of the plurality of pixels performs a correction by negatively feeding back the drain-to-source current of the drive transistor to a gate of the drive transistor during the write period.
2. The display apparatus according to claim 1 , wherein after the correction, the potential of the signal line is returned to the offset voltage.
3. The display apparatus according to claim 1 , wherein the pixel array section is sequentially scanned on a row-by-row basis, and the signal line corresponds to a given row of pixels, such that within the horizontal scanning period, the potential of the signal line is iteratively increased from the offset voltage, to the pre-charge voltage, and then to the input signal voltage for the given row of pixels.
4. A driving method of a display apparatus, the display apparatus comprising a pixel array section including a plurality of pixels, at least one of the plurality of pixels having a light-emitting element, a write transistor configured to write an input signal voltage from a signal line to a holding capacitance during a write period, and a drive transistor configured to drive the light-emitting element based on the input signal voltage held by the holding capacitance, and a write scan circuit the driving method comprising:
providing the input signal voltage via the signal line to the plurality of pixels, and
performing a correction by negatively feeding back the drain-to-source current of the drive transistor to a gate of the drive transistor during the write period, wherein
within a horizontal scanning period, a potential of the signal line is iteratively increased from an offset voltage, to a pre-charge voltage between the offset voltage and the input signal voltage, and then to the input signal voltage, an increase to the pre-charge voltage occurring before the write transistor is turned on to write the input signal voltage.
5. The driving method according to claim 4 , wherein after the correction, the potential of the signal line is returned to the offset voltage.
6. The driving method according to claim 4 , wherein the pixel array section is sequentially scanned on a row-by-row basis, and the signal line corresponds to a given row of pixels, such that within the horizontal scanning period, the potential of the signal line is iteratively increased from the offset voltage, to the pre-charge voltage, and then to the input signal voltage for the given row of pixels.
7. An electronic equipment having a display apparatus, the display apparatus comprising:
a pixel array section including a plurality of pixels, at least one of the plurality of pixels having a light-emitting element, a write transistor configured to write an input signal voltage from a signal line to a holding capacitance during a write period, and a drive transistor configured to drive the light-emitting element based on the input signal voltage held by the holding capacitance;
a drive circuit configured to supply the input signal voltage via the signal line to the plurality of pixels, wherein
within a horizontal scanning period, a potential of the signal line is iteratively increased from an offset voltage, to a pre-charge voltage between the offset voltage and the input signal voltage, and then to the input signal voltage, an increase to the pre-charge voltage occurring before the write transistor is turned on to write the input signal voltage, and
at least one of the plurality of pixels performs a correction by negatively feeding back the drain-to-source current of the drive transistor to a gate of the drive transistor during the write period.
8. The electronic equipment according to claim 7 , wherein after the correction, the potential of the signal line is returned to the offset voltage.
9. The electronic equipment according to claim 7 , wherein the pixel array section is sequentially scanned on a row-by-row basis, and the signal line corresponds to a given row of pixels, such that within the horizontal scanning period, the potential of the signal line is iteratively increased from the offset voltage, to the pre-charge voltage, and then to the input signal voltage for the given row of pixels.