Image display device
The invention provides an image display device that has an especially satisfactory display quality for animated images, and sufficiently suppresses the irregularities of display quality among pixels. The image display device includes a light emitting drive means that drives a light emitting means, based on an analog display signal inputted to the pixels, and a light emitting control switch for controlling a light-on or light-off of the light emitting means on one end of the light emitting drive means in each pixel.
1. An image display device comprising:
a pixel connecting to a signal line which provides a signal data, a reset line, a light-on switch line, an input switch line, and a power supply line, the pixel having an organic light emitting diode, an input switch controlled by a signal from the input switch line, a drive TFT through which current is supplied from the power supply line to the organic light emitting diode, a light-on switch controlled by a signal from the light-on switch line, and a reset switch controlled by a signal from the reset line,
wherein the signal data is inputted to a gate electrode of the drive TFT via the input switch,
a source electrode of the drive TFT is connected to the power supply line,
a drain electrode of the drive TFT is connected to a first electrode of the organic light emitting diode,
the light-on switch is connected between the drain electrode of the drive TFT and the first electrode,
a gate electrode of the reset switch is connected to the reset line,
a drain electrode of the reset switch is connected to the gate electrode of the drive TFT, and
a retention capacitor is arranged between the gate electrode of the drive TFT and the power supply line.
2. The image display device according to claim 1 , wherein the retention capacitor is arranged between the gate electrode of the drive TFT and the source electrode of the drive TFT.
3. The image display device according to claim 1 , further comprising a current path from the signal line to the gate electrode of the drive TFT.
4. The image display device according to claim 1 , wherein a capacitor does not located at a path from a drain electrode of the input switch to the gate electrode of the drive TFT.
5. An image display device comprising:
a pixel including an organic light emitting diode which has a first electrode and a second electrode,
a power supply line,
a signal line to which a signal data is inputted,
a light-on TFT which is connected to the first electrode,
a drive TFT which is connected between the light-on TFT and the power supply line,
an input TFT which is connected between the drive TFT and the signal line,
a reset TFT which is connected a gate electrode of the drive TFT,
a capacitor is arranged between the gate electrode of the drive TFT and the power supply line.
6. The image display device according to claim 5 , wherein the capacitor is arranged between the gate electrode of the drive TFT and a source electrode of the drive TFT.
7. The image display device according to claim 5 , wherein a first voltage is applied to the power supply line, and
a second voltage which is different from the first voltage is applied to the second electrode.
8. The image display device according to claim 5 , wherein the signal data is inputted to the gate electrode of the drive TFT via the input TFT.
9. The image display device according to claim 5 , wherein the signal data is inputted to the capacitor via the input TFT.
10. The image display device according to claim 5 , wherein a gate electrode of the input TFT is connected to an input switch line to which a scanning output is inputted,
a gate electrode of the light-on TFT is connected to a light-on switch line, and
a gate electrode of the reset TFT is connected to a reset line to which a reset voltage is inputted.
11. The image display device according to claim 5 , wherein the reset TFT has a gate electrode, a third electrode, and a fourth electrode,
the gate electrode of the reset TFT is connected to a reset line to which a reset voltage is inputted,
the third electrode is connected to the gate electrode of the drive TFT, and a predetermined voltage is applied to the fourth electrode.
12. The image display device according to claim 5 , further comprising a current path from the signal line to the gate electrode of the drive TFT.
13. The image display device according to claim 5 , wherein a capacitor does not located at a path from a drain electrode of the input TFT to the gate electrode of the drive TFT.
14. An image display device comprising:
a pixel including an organic light emitting diode which has a first electrode and a second electrode,
a power supply line,
a signal line to which a signal data is inputted,
a first switch which is connected to the first electrode,
a drive TFT which is connected between the first switch and the power supply line,
a second switch which is connected between the drive TFT and the signal line,
a third switch which is connected a gate electrode of the drive TFT,
a capacitor is arranged between the gate electrode of the drive TFT and the power supply line.
15. The image display device according to claim 14 , wherein the capacitor is arranged between the gate electrode of the drive TFT and a source electrode of the drive TFT.
16. The image display device according to claim 14 , wherein the third switch consists of a TFT,
the TFT has a gate electrode, a third electrode, and a fourth electrode,
the gate electrode of the TFT is connected to a reset line to which a reset voltage is inputted,
the third electrode is connected to the gate electrode of the drive TFT, and
a predetermined voltage is applied to the fourth electrode.
17. The image display device according to claim 14 , wherein a source electrode of the drive TFT is connected to the power supply line,
the third switch consists of a TFT,
the TFT has a gate electrode, a first electrode, and a second electrode,
the first electrode is connected to the gate electrode of the drive TFT, and
the second electrode is connected to a drain electrode of the drive TFT.
18. The image display device according to claim 17 , wherein the gate electrode of the TFT is connected to a first line to which a first signal is inputted,
the first signal turns on and off the third switch at a predetermined timing.
19. The image display device according to claim 14 , further comprising a current path from the signal line to the gate electrode of the drive TFT.
20. The image display device according to claim 14 , wherein a capacitor does not located at a path from the second switch to the gate electrode of the drive TFT.