Display device and control method thereof
Plural pixel circuits of a display device each include: a drive transistor having drain or source connected to a first power source voltage; a first capacitive element having a first electrode connected to a gate of the drive transistor and a second electrode connected to the source of the drive transistor; a second capacitive element having a first electrode connected to the second electrode of the first capacitive element and a second electrode directly connected to a data line that transmits a voltage corresponding to a light-emitting luminance; a first switching element that switches between conduction and non-conduction between the gate of the drive transistor and a fixed reference voltage; and a light-emitting device having a first electrode connected to source or drain of the drive transistor and a second electrode connected to a second power source voltage.
1. A display device, comprising:
a display having a plurality of pixels, each of the pixels including:
a drive transistor having a drain electrode and a source electrode, one of the drain electrode and the source electrode being directly connected to a first power source line that transmits a first power source voltage;
a first capacitor having a first electrode directly connected to a gate electrode of the drive transistor and a second electrode directly connected to the source electrode of the drive transistor;
a second capacitor having a first electrode directly connected to the second electrode of the first capacitor and a second electrode directly connected to a data line that transmits a data voltage corresponding to a luminance;
a first switch that switches between conduction and non-conduction between the gate electrode of the drive transistor and a reference voltage line that transmits a fixed reference voltage; and
a light-emitting device having a first electrode directly connected to an other of the drain electrode and the source electrode of the drive transistor and a second electrode directly connected to a second power source line that transmits a second power source voltage,
wherein, in a data voltage writing period, the first switch is switched to a conducting state in a row-to-be-written and to a non-conducting state in a row other than the row-to-be-written.
2. The display device according to claim 1 ,
wherein each of the pixels further includes a second switch provided between the source electrode of the drive transistor and the second electrode of the first capacitor.
3. The display device according to claim 1 ,
wherein each of the pixels further includes a third switch provided between the first power source line and the one of the drain electrode and the source electrode of the drive transistor.
4. The display device according to claim 1 ,
wherein each of the pixels further includes a fourth switch provided between the data line and the second electrode of the second capacitor.
5. A method of controlling a display device including a display having a plurality of pixels, each of the pixels including:
a drive transistor having a drain electrode and a source electrode, one of the drain electrode and the source electrode being directly connected to a first power source line that transmits a first power source voltage;
a first capacitor having a first electrode directly connected to a gate electrode of the drive transistor and a second electrode directly connected to the source electrode of the drive transistor;
a second capacitor having a first electrode directly connected to the second electrode of the first capacitor and a second electrode directly connected to a data line that transmits a data voltage corresponding to a luminance;
a first switch that switches between conduction and non-conduction between the gate electrode of the drive transistor and a reference voltage line that transmits a fixed reference voltage; and
a light-emitting device having a first electrode directly connected to the other of the drain electrode and the source electrode of the drive transistor and a second electrode directly connected to a second power source line that transmits a second power source voltage,
the method comprising:
detecting a threshold voltage of the drive transistor by switching the first switch conductive in each of the pixels; and
writing a data voltage including switching the first switch to a conducting state in a row-to-be-written and to a non-conducting state in a row other than the row-to-be-written.
6. The method of controlling a display device according to claim 5 ,
wherein, in at least the detecting,
a voltage set to a value between a maximum value and a minimum value of the data voltage is applied to the second electrode of the second capacitor.
7. The method of controlling the display device according to claim 5 ,
wherein, in the display device, each of the pixels further includes a second switch provided between the source electrode of the drive transistor and the second electrode of the first capacitor, and
the writing includes switching the second switch to the non-conducting state, and holding the data voltage by the first capacitor and the second capacitor.