Light emitting device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsYu Yamazaki, Aya Anzai, Mitsuaki Osame
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Abstract
This invention provides a light emitting device in which each pixel has three sub-pixels for emitting different colors, comprising a signal correction circuit for correcting gradation information of each signal depending on the light emitting index of each sub-pixels, characterized in that; the signal correction circuit has a means to calculate a signal having gradation information according to the following formulae; multiplying the gradation information of the signal input into the three sub-pixels by (1/α):(1/β):(1/γ), when the ratio of the light emitting indexes of the three sub-pixels is α:β:γ.
Claims27
A light emitting device comprising:
- a pixel having a plurality of sub-pixels provided with light emitting elements;
- and
- a signal correction circuit for correcting gradation information of a signal voltage,
- wherein the signal correction circuit comprises a means for calculating a product of the signal voltage and the inverse number of the luminance of the light emitted from the emitting elements, when same signal voltage is applied to the plurality of sub-pixels.
A light emitting device comprising:
- a pixel having a plurality of sub-pixels provided with light emitting elements for emitting different color from each other;
- and
- a signal correction circuit for correcting gradation information of a signal voltage,
- wherein the signal correction circuit has a means for calculating a product of the inverse number of each light emitting index of the plurality of sub-pixels, and the signal voltage,
- wherein each of the plurality of sub-pixel has a driving means for supplying current to the light emitting element, and a current supply means for supplying current to the driving means, and
- wherein the current supply means of the plurality of sub-pixel are connected to a power supply.
A light emitting device comprising:
- a pixel having a plurality of sub-pixels provided with light emitting elements for emitting different color from each other;
- a signal correction circuit for correcting gradation information of a signal voltage;
- and
- a pixel portion in which the plurality of pixels are arranged in matrix,
- wherein the signal correction circuit has a means for calculating a product of the inverse number of each light emitting index of the plurality of sub-pixels, and the signal voltage,
- wherein each of the plurality of sub-pixel has a driving means for supplying current to the light emitting element, and a current supply means for supplying current to the driving means, and
- wherein the current supply means of the plurality of pixel is connected to a power supply.
A light emitting device comprising:
- a pixel having a plurality of sub-pixels provided with light emitting elements for emitting different color from each other;
- a signal correction circuit for correcting gradation information of a signal voltage;
- and
- a time division signal generation circuit for setting a plurality of sub-frame period in a unit frame period,
- wherein the signal correction circuit has a means for calculating a product of the inverse number of each light emitting index of the plurality of sub-pixels, and the signal voltage,
- wherein the time division signal generation circuit has a means for setting a light emitting status or a non-light emitting status by using the product, in each of the plurality of sub-frame period.
A method for driving a light emitting device having a light emitting element in a sub-pixel comprising the steps of:
- correcting gradation information of a signal voltage by calculating a product of the signal voltage and the inverse number of the luminance of the light emitting element, when same signal voltage is applied to the sub-pixel.
Dependencies are inferred from the claim text.