Compensation technique for luminance degradation in electro-luminance devices
First Claim
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1. A pixel circuit comprising:
- a light emitting device having an initial ON voltage;
a power source for supplying a driving current to said light emitting device;
a driving transistor having a first terminal coupled to said power source and a second terminal coupled to said light emitting device, for supplying a driving current to the light emitting device during a driving cycle, the driving transistor also having a gate terminal, the driving transistor having a threshold voltage less than said initial ON voltage of said light emitting device;
a source of a programming voltage;
a storage capacitor having a first terminal coupled to said gate terminal of said driving transistor, and a second terminal coupled to said source of the programming voltage and to a node between said driving transistor and said light emitting device for charging to a voltage that is a function of said programming voltage and said initial ON voltage of said light emitting device during a programming cycle, so that the voltage between said gate terminal and said second terminal of said driving transistor is a function of said programming voltage and said initial ON voltage of said light emitting device, at said node between said driving transistor and said light emitting device, during a driving cycle.
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Abstract
A method and system for compensation for luminance degradation in electro-luminance devices is provided. The system includes a pixel circuit having a light emitting device, a storage capacitor, a plurality of transistors, and control signal lines to operate the pixel circuit. The storage capacitor is connected or disconnected to the transistor and a signal line(s) when programming and driving the pixel circuit.
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Citations
13 Claims
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1. A pixel circuit comprising:
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a light emitting device having an initial ON voltage; a power source for supplying a driving current to said light emitting device; a driving transistor having a first terminal coupled to said power source and a second terminal coupled to said light emitting device, for supplying a driving current to the light emitting device during a driving cycle, the driving transistor also having a gate terminal, the driving transistor having a threshold voltage less than said initial ON voltage of said light emitting device; a source of a programming voltage; a storage capacitor having a first terminal coupled to said gate terminal of said driving transistor, and a second terminal coupled to said source of the programming voltage and to a node between said driving transistor and said light emitting device for charging to a voltage that is a function of said programming voltage and said initial ON voltage of said light emitting device during a programming cycle, so that the voltage between said gate terminal and said second terminal of said driving transistor is a function of said programming voltage and said initial ON voltage of said light emitting device, at said node between said driving transistor and said light emitting device, during a driving cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification