Image display apparatus using current-controlled light emitting element
AssigneesKYOCERA Corporation, Chi Mei Optoelectronics Corp.
InventorsShinya Ono, Yoshinao Kobayashi
Life of this patent
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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.
Claims10
An image display apparatus comprising:
- 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.
Dependencies are inferred from the claim text.