Light emitting device and method of driving the same
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorHajime Kimura
Life of this patent
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Abstract
The present invention specifies the characteristic of a driving transistor provided in a pixel and corrects a video signal to be inputted to the pixel based on the specification. As a result, a light emitting device and its driving method in which influence of fluctuation in characteristic among transistors is removed to obtain clear multi-gray scale are provided. The present invention can also provide a light emitting device and its driving method in which a change with age in amount of current flowing between two electrodes of a light emitting element is reduced to obtain clear multi-gray scale display.
Claims6
A method of driving a light emitting device, comprising:
- inputting a first signal having a first potential P0 to each of a plurality of pixels;
- obtaining a first current value I0 of all of the plurality of pixels after inputting the first signal to each of the plurality of pixels;
- inputting a second signal having a second potential P1 to a first pixel of the plurality of pixels;
- obtaining a second current value I1 of all of the plurality of pixels after inputting the second signal to the first pixel;
- inputting a third signal P2 having a third potential to the first pixel;
- obtaining a third current value I2 of all of the plurality of pixels after inputting the third signal P2 to the first pixel;
- calculating a current value Q1 and a current value Q2 which are Q1=I1−I0 and Q2=I2−I0;
- obtaining an interpolation function F from two sets of data (P, Q)=(P1, Q1) and (P2, Q2);
- and
- storing constants in the interpolation function F to a storage medium in the light emitting device,
- wherein the first current value I0 is a current value of when each of the plurality of pixels does not emit light.
A method of driving a light emitting device, comprising:
- inputting a first signal having a first potential P0 to each of a plurality of pixels;
- obtaining a first current value I0 of all of the plurality of pixels after inputting the first signal to each of the plurality of pixels;
- inputting a second signal having a second potential P1 to a first pixel of the plurality of pixels;
- obtaining a second current value I1 of all of the plurality of pixels after inputting the second signal to the first pixel;
- inputting a third signal P2 having a third potential to the first pixel;
- obtaining a third current value I2 of all of the plurality of pixels after inputting the third signal P2 to the first pixel;
- calculating a current value Q1 and a current value Q2 which are Q1=I1−I0 and Q2=I2−I0;
- obtaining an interpolation function F from two sets of data (P, Q)=(P1, Q1) and (P2, Q2);
- and
- storing constants in the interpolation function F to a storage medium in the light emitting device,
- wherein the first potential is different from the second potential, and
- wherein the first current value I0 is a current value of when each of the plurality of pixels does not emit light.
Dependencies are inferred from the claim text.