Image display apparatus using current-controlled light emitting element
First Claim
Patent Images
1. An image display apparatus comprising:
- a display region having a plurality of pixels, each pixel comprisinga current-controlled light emitting element that emits light with a brightness corresponding to a current flowing in the current-controlled light emitting element,a driver element that includes at least first and second terminals and controls the current flowing into the electric light emitting element based on a potential difference applied between the terminals, anda data line that supplies a potential to the first terminal, and a conductive member that is electrically connected to the second terminal; and
a threshold voltage obtaining unit that obtains a threshold voltage of the driver element based on the potential of the conductive member corresponding to an amount of charges supplied from the current source to the second terminal, whereinthe threshold voltage obtaining unit obtains a threshold voltage based on potentials of the conductive member at two or more different times after the driver element becomes on-state and before the driver element becomes off-state caused by rising of the potential of the conductive member up to a predetermined potential, andthe threshold voltage obtaining unit obtains the threshold voltage, and obtains a mobility in a current passage portion of the driver element and a coefficient according to a shape of the current passage portion.
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Abstract
A pixel circuit includes a driver element that is supplied with a potential from a data line. The driver element controls a value of current passing through an electric light emitting element. Upon obtaining a threshold voltage, a conductive member connected to the electric light emitting element is made to be a floating state to cause the driver element to become on-state, variations in the potential of the conductive member caused by charges passing through the driver element to flow into the conductive member are detected by a threshold voltage detector to obtain the threshold voltage of the driver element.
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Citations
10 Claims
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1. An image display apparatus comprising:
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a display region having a plurality of pixels, each pixel comprising a current-controlled light emitting element that emits light with a brightness corresponding to a current flowing in the current-controlled light emitting element, a driver element that includes at least first and second terminals and controls the current flowing into the electric light emitting element based on a potential difference applied between the terminals, and a data line that supplies a potential to the first terminal, and a conductive member that is electrically connected to the second terminal; and a threshold voltage obtaining unit that obtains a threshold voltage of the driver element based on the potential of the conductive member corresponding to an amount of charges supplied from the current source to the second terminal, wherein the threshold voltage obtaining unit obtains a threshold voltage based on potentials of the conductive member at two or more different times after the driver element becomes on-state and before the driver element becomes off-state caused by rising of the potential of the conductive member up to a predetermined potential, and the threshold voltage obtaining unit obtains the threshold voltage, and obtains a mobility in a current passage portion of the driver element and a coefficient according to a shape of the current passage portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification