Method and system for driving an active matrix display circuit
First Claim
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1. A display system, the system comprising:
- a pixel circuit for being driven to emit light according to programming information during an emission cycle, the pixel circuit comprising;
a light emitting device for emitting light during the emission cycle,a drive transistor for conveying a drive current through the light emitting device during the emission cycle, said drive transistor having first, second, and gate terminals, a first terminal of said drive transistor coupled to said light-emitting device, anda regulating transistor for conveying a leakage current to the gate terminal of the drive transistor while operating in a sub-threshold regime during the emission cycle, thereby adjusting a gate voltage of the drive transistor during the emission cycle, said regulating transistor having first, second, and gate terminals,the first terminal of said regulating transistor being coupled to said gate terminal of said drive transistor,the second terminal of said regulating transistor being coupled via a first conductive path to a node between said light emitting device and said drive transistor, the conductive path not including the drive transistor and not including the light emitting device, andthe gate terminal of said regulating transistor being coupled via a second conductive path to one of the first and the second terminals of the regulating transistor for operating the regulating transistor in said sub-threshold regime, the second conductive path not including the light emitting device and not including a capacitor.
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Abstract
A method and system for driving an active matrix display is provided. The system includes a drive circuit for a pixel having a light emitting device. The drive circuit includes a drive transistor for driving the light emitting device. The system includes a mechanism for adjusting the gate voltage of the drive transistor.
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Citations
14 Claims
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1. A display system, the system comprising:
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a pixel circuit for being driven to emit light according to programming information during an emission cycle, the pixel circuit comprising; a light emitting device for emitting light during the emission cycle, a drive transistor for conveying a drive current through the light emitting device during the emission cycle, said drive transistor having first, second, and gate terminals, a first terminal of said drive transistor coupled to said light-emitting device, and a regulating transistor for conveying a leakage current to the gate terminal of the drive transistor while operating in a sub-threshold regime during the emission cycle, thereby adjusting a gate voltage of the drive transistor during the emission cycle, said regulating transistor having first, second, and gate terminals, the first terminal of said regulating transistor being coupled to said gate terminal of said drive transistor, the second terminal of said regulating transistor being coupled via a first conductive path to a node between said light emitting device and said drive transistor, the conductive path not including the drive transistor and not including the light emitting device, and the gate terminal of said regulating transistor being coupled via a second conductive path to one of the first and the second terminals of the regulating transistor for operating the regulating transistor in said sub-threshold regime, the second conductive path not including the light emitting device and not including a capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating a display having a pixel circuit for driving a light emitting device, the method comprising:
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conveying by a drive transistor, a drive current through the light emitting device to emit light during an emission cycle, said drive transistor having first, second, and gate terminals, a first terminal of said drive transistor coupled to said light-emitting device, and conveying, during the emission cycle, a leakage current by a regulating transistor having first, second, and gate terminals, between the gate terminal of the drive transistor and a node between said light emitting device and said drive transistor while operating the regulating transistor in a sub-threshold regime, the first terminal of said regulating transistor being coupled to said gate terminal of said drive transistor, the second terminal of said regulating transistor being coupled via a first conductive path to the node, the conductive path not including the drive transistor and not including the light emitting device, and the gate terminal of said regulating transistor being coupled via a second conductive path to one of the first and the second terminals of the regulating transistor for operating the regulating transistor in said sub-threshold regime, the second conductive path not including the light emitting device and not including a capacitor. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification