Active-matrix light emitting display and method for obtaining threshold voltage compensation for same
AssigneeInternational Business Machines Corporation
InventorsFrank Robert Libsch, James Lawrence Sanford
Life of this patent
Estimating the term…
Abstract
An active matrix display includes a plurality of pixels arranged in an array, a first transistor and a second transistor associated with each pixel, the first and second transistors positioned within the array for controlling current flow through each pixel, a light emitting diode associated with each pixel; and a storage capacitor associated with each pixel, wherein, during a time period for establishment of a threshold voltage on the storage capacitor for the first transistor, a voltage equal to the sum of the threshold voltage and a voltage for compensating for turnoff of the second transistor is established on the storage capacitor.
Claims37
An active matrix display, comprising:
- a plurality of pixels arranged in an array;
- a first transistor and a second transistor associated with each pixel, the first and second transistors positioned within the array for controlling current flow through each pixel;
- a light emitting diode associated with each pixel;
- and
- a storage capacitor associated with each pixel, wherein, during a time period for establishment of a threshold voltage on the storage capacitor for the first transistor, a voltage equal to the sum of the threshold voltage and a voltage for compensating for turnoff of the second transistor is established on the storage capacitor.
A method for obtaining threshold voltage compensation for an active matrix display, comprising:
- providing a plurality of pixels arranged in an array, wherein each pixel includes a first transistor, a second transistor, a light emitting diode, and a storage capacitor associated therewith;
- positioning the first and second transistors within the array for controlling current flow through each pixel;
- and
- establishing on the storage capacitor a voltage equal to the sum of a threshold voltage for the first transistor and a voltage for compensating for turnoff of the second transistor.
An active matrix display, comprising:
- a plurality of pixels arranged in an array;
- at least three transistors associated with each pixel, the at least three transistors positioned within the array for controlling current flow through each pixel;
- a light emitting diode associated with each pixel;
- and
- a storage capacitor associated with each pixel, wherein, during a time period for establishment of a threshold voltage on the storage capacitor for a first transistor of the at least three transistors, a voltage of the storage capacitor is set to a voltage including the threshold voltage and a voltage for compensating for turnoff of a second transistor of the at least three transistors.
A method for obtaining threshold voltage compensation for an active matrix display, comprising:
- providing a plurality of pixels arranged in an array, wherein each pixel includes at least three transistors, a light emitting diode, and a storage capacitor associated therewith;
- positioning the at least three transistors within the array for controlling current flow through each pixel;
- and
- establishing, during a time period for establishment of a threshold voltage of a first transistor of the at least three transistors on the storage capacitor, a voltage for compensating for turnoff of a second transistor of the at least three transistors on the storage capacitor.
A pixel circuit for an active matrix display, comprising:
- at least three transistors for controlling current flow through a pixel;
- a light emitting diode;
- a plurality of signal lines for carrying signals for controlling the at least three transistors;
- a plurality of power connections for supplying power to the pixel;
- and
- a storage capacitor, wherein, during a time period for establishment of a threshold voltage on the storage capacitor for a first transistor of the at least three transistors, a voltage equal to the sum of the threshold voltage and a voltage for compensating for turnoff of a second transistor of the at least three transistors is established on the storage capacitor.
Dependencies are inferred from the claim text.