System and methods for extraction of threshold and mobility parameters in AMOLED displays
First Claim
1. A method of extracting mobility from a drive transistor in a pixel circuit based on the transient settling of the drive transistor, said method comprising:
- measuring the current of the drive transistor over a constant interval; and
calculating the mobility of the drive transistor from the measured current.
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Accused Products
Abstract
A system to improve the extraction of transistor and OLED parameters in an AMOLED display includes a pixel circuit having an organic light emitting device, a drive device to provide a programmable drive current to the light emitting device, a programming input to provide the programming signal, and a storage device to store the programming signal. A charge-pump amplifier has a current input and a voltage output. The charge-pump amplifier includes an operational amplifier in negative feedback configuration. The feedback is provided by a capacitor connected between the output and the inverting input of the operational amplifier. A common-mode voltage source drives the non-inverting input of the operational amplifier. An electronic switch is coupled across the capacitor to reset the capacitor. A switch module including the input is coupled to the output of the pixel circuit and an output is coupled to the input of the charge-pump amplifier.
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Citations
4 Claims
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1. A method of extracting mobility from a drive transistor in a pixel circuit based on the transient settling of the drive transistor, said method comprising:
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measuring the current of the drive transistor over a constant interval; and calculating the mobility of the drive transistor from the measured current. - View Dependent Claims (2, 3, 4)
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Specification