Pixel driver circuit and pixel circuit having the pixel driver circuit
A pixel driver circuit for driving a light-emitting element and a pixel circuit having the pixel driver circuit are provided. The pixel driver circuit includes a data line, address lines, switch thin film transistors, feedback thin film transistors and drive thin film transistors. The pixel circuit may include an organic light emitting diode, which is driven by the pixel driver circuit.
1. A pixel driver circuit comprising:
an address line;
a data line;
a switch thin film transistor, a first node of the switch transistor being connected to the data line and a gate of the switch transistor being connected to the address line;
a feedback thin film transistor, a first node of the feedback transistor being connected to the data line and a gate of the feedback transistor being connected to the address line;
a reference thin film transistor, a drain of the reference transistor being connected to a second node of the feedback transistor, a gate of the reference transistor being connected to a second node of the switch transistor and a source of the reference transistor being connected to a ground potential; and
a drive thin film transistor, a gate of the drive transistor being connected to the gate of the reference transistor.
2. The pixel driver circuit according to claim 1 wherein at least one of the thin film transistors is an amorphous silicon based thin film transistor.
3. The pixel driver circuit according to claim 1 wherein at least one of the thin film transistors is a polycrystalline silicon based thin film transistor.
4. The pixel driver circuit according to claim 1 wherein at least one of the thin film transistors is a p-channel thin film transistor.
5. The pixel driver circuit according to claim 1 wherein the thin film transistors each comprise a second gate.
6. A pixel circuit comprising:
a pixel driver circuit according to claim 1 ; and
an organic light emitting diode, the source of the drive transistor being connected to the ground potential and the drain of the drive transistor being connected to the organic light emitting diode.
7. The pixel circuit according to claim 6 , further comprising a capacitor, the capacitor being connected between the gate of the drive transistor and the ground potential.
8. A pixel circuit comprising:
a pixel driver circuit including:
an address line;
a data line;
a switch thin film transistor, a first node of the switch transistor being connected to the data line and a gate of the switch transistor being connected to the address line;
a feedback thin film transistor, a first node of the feedback transistor being connected to the data line and a gate of the feedback transistor being connected to the address line;
a reference thin film transistor, a drain of the reference transistor being connected to a second node of the feedback transistor, a gate of the reference transistor being connected to a second node of the switch transistor and a source of the reference transistor being connected to a ground potential; and
a drive thin film transistor, a gate of the drive transistor being connected to the gate of the reference transistor, and
an organic light emitting diode, the source of the drive transistor being connected to the organic light emitting diode, and the drain of the drive transistor being connected to a voltage supply.