Voltage programmed pixel circuit, display system and driving method thereof
First Claim
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1. A method of programming a pixel circuit including a driving section having a drive transistor and an emissive device and a programming section having a programming transistor, the method comprising:
- applying from a data line a programming voltage to the programming transistor during a programming cycle;
the programming transistor converting the programming voltage to a corresponding programming current;
the programming current adjusting a gate-source voltage of the drive transistor; and
the driving section driving the emissive device with a drive current related to the programming current while the programming transistor is off, such that the drive current is independent of aging effects of the drive transistor and of the emissive device.
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Abstract
A voltage programmed pixel circuit, display system having the pixel circuit and driving method thereof is provided. The pixel circuit includes a light emitting device, a driving transistor connected to the light emitting device and a programming circuit. The programming circuit adjusts a pixel current during a programming cycle of the pixel circuit.
368 Citations
11 Claims
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1. A method of programming a pixel circuit including a driving section having a drive transistor and an emissive device and a programming section having a programming transistor, the method comprising:
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applying from a data line a programming voltage to the programming transistor during a programming cycle; the programming transistor converting the programming voltage to a corresponding programming current; the programming current adjusting a gate-source voltage of the drive transistor; and the driving section driving the emissive device with a drive current related to the programming current while the programming transistor is off, such that the drive current is independent of aging effects of the drive transistor and of the emissive device. - View Dependent Claims (2, 3, 4, 5)
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6. A method of programming a pixel circuit including a driving section having a drive transistor and an emissive device and a programming section having a programming transistor, a first terminal of the programming transistor coupled to a first terminal of the drive transistor, the method comprising, during a frame:
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during a programming cycle; applying a gate voltage to a gate of the drive transistor and a second terminal voltage to a second terminal of the drive transistor turning the drive transistor off; and driving the programming transistor on with a first voltage difference across a gate of the programming transistor and a second terminal of the programming transistor having a magnitude equal to a predetermined programming voltage to charge a storage element coupled to the first terminal of the programming transistor with a driving voltage, and during an operation cycle following the programming cycle; applying the driving voltage across the gate of the drive transistor and the first terminal of the drive transistor to turn it on; and driving the programming transistor off with a second voltage difference across the gate of the programming transistor and the second terminal of the programming transistor. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification