Driving method for organic electroluminescence light emitting section
View Patent ↗A driving method for an organic EL light emitting section achieves optimization of mobility correction for a transistor of a driving circuit in response to luminance. In a driving circuit formed from a driving transistor, an image signal writing transistor and a capacitor section having a pair of electrodes, a driving method carries out a pre-process, a threshold voltage cancellation process and a writing process. A variable correction voltage which relies upon the image signal voltage is applied to a first node of the capacitor and a voltage which is higher than a potential of the second node of the capacitor in the threshold voltage cancellation process is applied to the drain electrode of the driving transistor, between the threshold voltage cancellation process and the writing process, to raise the potential of the second node in response to a characteristic of the driving transistor.
1. A driving method for an organic electroluminescence light emitting section which uses pixel circuit including a driving transistor and a writing transistor, the driving transistor being connected between a current supplying section and a light emitting section, the writing transistor being connected to a data line, the driving method comprising:
applying a correction voltage to a gate of the driving transistor from the data line through the writing transistor;
applying an image signal to the gate of the driving transistor from the data line through the writing transistor, said applying the correction voltage to the gate and applying the image signal to the gate occurring separately and cumulatively contributing to a potential difference between the gate of the driving transistor and the source of the driving transistor; and
supplying current from the current supplying section to the light emitting section through the driving transistor corresponding to the value of the potential difference between the gate of the driving transistor and the source of the driving transistor,
wherein the value of the correction voltage is a value which depends upon the image signal applied from the data line.
2. A display apparatus comprising:
an organic electroluminescence light emitting section; and
a pixel circuit including
a driving transistor, and
a writing transistor,
the driving transistor being connected between a current supplying section and a light emitting section, the writing transistor being connected to a data line, wherein
a correction voltage is applied to a gate of the driving transistor from the data line through the writing transistor,
an image signal is applied to the gate of the driving transistor from the data line through the writing transistor, said appling the correction voltage to the gate and applying the image signal to the gate occurring separately and cumulatively contributing to a potential difference between the gate of the driving transistor and the source of the driving transistor,
current is supplied from the current supplying section to the light emitting section through the driving transistor corresponding to the value of the potential difference between the gate of the driving transistor and the source of the driving transistor, and
the value of the correction voltage is a value that depends upon the image signal applied from the data line.
3. An electronic device comprising the display apparatus according to claim 2 .
4. A display apparatus comprising:
an organic electroluminescence light emitting section; and
a pixel circuit including
a driving transistor,
a writing transistor, and
a storage capacitor,
the driving transistor being connected between a current supplying section and a light emitting section, the writing transistor being connected to a data line,
the storage capacitor being connected between a gate of the driving transistor and a current terminal of the driving transistor,
wherein
a drive transistor characteristic correction is imparted to the storage capacitor,
an image signal is imparted to the storage capacitor from the data line through the writing transistor,
said imparting the drive transistor characteristic correction to the storage capacitor and imparting the image signal to the storage capacitor occurring separately and cumulatively contributing to a potential difference between the gate of the driving transistor and the current terminal of the driving transistor, and
current is supplied from the current supplying section to the light emitting section through the driving transistor corresponding to the value of the potential difference between the gate of the driving transistor and the current terminal of the driving transistor.
5. An electronic device comprising the display apparatus according to claim 4 .