Method of driving pixel element in active matrix display
OwnerNongqiang Faninventor
Life of this patent
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Abstract
A method of driving a pixel element an active matrix display. The method inducing a change of the bias voltage of the first transistor towards its threshold voltage with an essentially constant current provided from the semiconductor channel of a field effect transistor to cause the bias voltage of the first transistor linearly depend upon the time lapse since the light-emitting element starts to emit light. The method also includes terminating light emitted from the light-emitting element after the bias voltage of the first transistor becomes substantially close to the threshold voltage of the first transistor.
Claims20
A method of driving a pixel element in a matrix of pixel elements of an active matrix display, the pixel element comprising (1) a first capacitive element, (2) a first transistor having a semiconductor channel, a first terminal of the semiconductor channel of the first transistor being electrically connected to a first terminal of the first capacitive element, and (3) a light-emitting element, wherein the first transistor is biased at a bias voltage between the gate of the first transistor and a first terminal of the semiconductor channel of the first transistor, the active matrix display comprising an array of column conducting lines and an array of row conducting lines crossing the array of column conducting lines, the method comprising:
- setting the bias voltage of the first transistor to a value that is substantially close to a threshold voltage of the first transistor by changing a voltage across the first capacitive element with a current passing through the first transistor;
- setting the bias voltage of the first transistor to a value that is different from the threshold voltage of the first transistor while substantially maintaining the voltage across the first capacitive element;
- inducing a change of the bias voltage of the first transistor towards the threshold voltage thereof with an essentially constant current provided from the semiconductor channel of a field effect transistor to cause the bias voltage of the first transistor linearly depend upon the time, the essentially constant current being independent of the intensity of light emitted by the light-emitting element while the light-emitting element is emitting light;
- and
- terminating light emitted from the light-emitting element after said inducing a change of the bias voltage of the first transistor causes the bias voltage of the first transistor becoming substantially close to the threshold voltage of the first transistor.
A method of driving a pixel element in a matrix of pixel elements of an active matrix display, the pixel element comprising (1) a first capacitive element, (2) a first transistor having a semiconductor channel, and (3) a light-emitting element, wherein the first transistor is biased at a bias voltage between the gate of the first transistor and a first terminal of the semiconductor channel of the first transistor, the active matrix display comprising an array of column conducting lines and an array of row conducting lines crossing the array of column conducting lines, the method comprising:
- changing the bias voltage of the first transistor to a value that is different from a threshold voltage of the first transistor;
- emitting light from the light-emitting element while changing the bias voltage of the first transistor towards the threshold voltage thereof with an essentially constant current provided from the semiconductor channel of a field effect transistor to cause the bias voltage of the first transistor linearly depend upon the time lapse since the light-emitting element starts to emit light, the essentially constant current being independent of the intensity of light emitted by the light-emitting element;
- and
- terminating light emitted from the light-emitting element after the bias voltage of the first transistor becomes substantially close to the threshold voltage of the first transistor.
A method of driving a pixel element in a matrix of pixel elements of an active matrix display, the pixel element comprising (1) a first capacitive element, (2) a first transistor having a semiconductor channel, and (3) a light-emitting element, wherein the first transistor is biased at a bias voltage between the gate of the first transistor and a first terminal of the semiconductor channel of the first transistor, the active matrix display comprising an array of column conducting lines and an array of row conducting lines crossing the array of column conducting lines, the method comprising:
- changing the bias voltage of the first transistor to a value that is different from a threshold voltage of the first transistor;
- inducing a change of the bias voltage of the first transistor towards the threshold voltage thereof with an essentially constant current provided from the semiconductor channel of a field effect transistor to cause the bias voltage of the first transistor linearly depend upon the time, the essentially constant current being independent of the intensity of light emitted by the light-emitting element while the light-emitting element is emitting light;
- and
- terminating light emitted from the light-emitting element after said inducing a change of the bias voltage of the first transistor causes the bias voltage of the first transistor becoming substantially close to the threshold voltage of the first transistor.
Dependencies are inferred from the claim text.