Image display device
View Patent ↗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 gate drive circuit; and
pixels, each of which comprises a light emitting device, a pixel capacitor, a drive transistor, a reset transistor, and a light-on transistor;
wherein a signal line is connected through the pixel capacitor to a gate of the drive transistor;
a source of the drive transistor is connected to a power supply line;
a drain of the drive transistor is connected to one end of the light emitting device through a source-drain path of the light-on transistor;
a gate of the light-on transistor is connected to a light-on line;
the other end of the light emitting device is connected to a common terminal; a source-drain path of the reset transistor is connected between the gate and the drain of the drive transistor;
a gate of the reset transistor is connected to a reset line; and
during a write period, a signal voltage is inputted into the signal lines, the gate drive circuit controls the reset line and the light-on line so that reset transistor is turned ON after the light-on transistor is turned ON, and then the reset transistor is turned OFF after the light-on transistor is turned OFF.
2. The image display device according claim 1 :
wherein the drive transistor is made of a p-channel MOS transistor.
3. The image display device according claim 1 :
wherein a gate of the reset transistor is connected to a reset line; and
a gate of the light-on transistor is connected to a light-on line.
4. The image display device according claim 1 :
wherein during a light-on period, the light-on transistor is turned ON.
5. The image display device according claim 1 :
wherein during a light-on period, the light-on transistor is turned ON, and either one of a symmetry triangular waveform, an asymmetrical triangular waveform, a non-linear triangular waveform, and plural triangular waveforms is inputted into the signal line.
6. The image display device according claim 1 :
wherein a pixel capacitor, a drive transistor, a reset transistor, a light-on transistor are made of low temperature polycrystalline silicon TFTs on either one of a glass substrate, a quartz substrate, a transparent plastic substrate, and a non-transparent substrate.
7. The image display device according claim 1 :
wherein the signal voltage is either one of an analog voltage and a discrete gradation voltage.
8. The image display device according claim 1 :
wherein a light emitting device is either one of a OLED, an inorganic diode, and an illuminant.
9. The image display device according claim 1 :
wherein a ratio of the light-on period is set to either one of 70%, 50%, 30%, and 10% of a frame period.
10. An image display device comprising:
a gate drive circuit; and
pixels, each of which comprises a light emitting device, a pixel capacitor, a drive transistor, a reset transistor, and a light-on transistor;
wherein a signal line is connected through the pixel capacitor to a gate of the drive transistor;
a source of the drive transistor is connected to a power supply line;
a drain of the drive transistor is connected to one end of the light emitting device through a source-drain path of the light-on transistor;
a gate of the light-on transistor is connected to a light-on line;
the other end of the light emitting device is connected to a common terminal;
a source-drain path of the reset transistor is connected between the gate and the drain of the drive transistor;
a gate of the reset transistor is connected to a reset line; and
during a write period, the gate drive circuit controls the reset line and the light-on line so that reset transistor is turned ON after the light-on transistor is turned ON, and then the reset transistor is turned OFF after the light-on transistor is turned OFF.
11. The image display device according claim 10 :
wherein the drive transistor is made of a p-channel MOS transistor.
12. The image display device according claim 10 :
wherein a gate of the reset transistor is connected to a reset line; and
a gate of the light-on transistor is connected to a light-on line.
13. The image display device according claim 10 :
wherein during a light-on period, the light-on transistor is turned ON.
14. The image display device according claim 10 :
wherein during a light-on period, the light on transistor is turned ON, and either one of a symmetry triangular waveform, an asymmetrical triangular waveform, a non-linear triangular waveform, and plural triangular waveforms is inputted into the signal line.
15. The image display device according claim 10 :
wherein a pixel capacitor, a drive transistor, a reset transistor, a light-on transistor are made of low temperature polycrystalline silicon TFTs on either one of a glass substrate, a quartz substrate, a transparent plastic substrate, and a non-transparent substrate.
16. The image display device according claim 10 :
wherein the signal voltage is either one of an analog voltage and a discrete gradation voltage.
17. The image display device according claim 10 :
wherein a light emitting device is either one of a OLED, an inorganic diode, and an illuminant.
18. The image display device according claim 10 :
wherein a ratio of the light-on period is set to either one of 70%, 50%, 30%, and 10% of a frame period.