Driving method of light emitting device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsShunpei Yamazaki, Kazutaka Inukai, Yasuko Watanabe
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Abstract
A method of driving a light emitting device in which a plurality of pixels having a light emitting element are formed, characterized by including: setting j display periods (where j is a natural number) to appear in one frame period, each of the j display periods corresponding to one bit of a k-bit digital video signal (where k is a natural number); and subjecting lower n bits of the k bits (where n is a natural number, j≧k−n) to one or both of dither processing and error diffusion processing to thereby select whether the pixels turn on or turn off in each of the j display periods according to a (k−n)-bit digital video signal that is converted from the k-bit digital video signal.
Claims12
A method of driving a light emitting device in which a plurality of pixels having a light emitting element are formed, the method comprising:
- setting j display periods (where j is a natural number) in one frame period, each of the j display periods corresponding to one bit of a k-bit digital video signal (where k is a natural number);
- subjecting lower n bits of the k bits (where n is a natural number, j≧k−n) to one or both of dither processing and error diffusion processing to thereby select whether the pixels turn on or turn off in each of the j display periods according to a (k−n)-bit digital video signal that is converted from the k-bit digital video signal;
- and
- turning on the pixels that perform display of the q-th gray scale information for at least one display period in addition to all of the turn-on display periods for displaying the (q−1)-th gray scale information (where q is a natural number).
A method of driving a light emitting device in which a plurality of pixels having a light emitting element are formed, the method comprising:
- setting j display periods (where j is a natural number) in one frame period;
- subjecting lower n bits of a k-bit digital video signal (where n is a natural number, j≧k−n) to one or both of dither processing and error diffusion processing to thereby select whether the pixels turn on or turn off in each of the j display periods according to a (k−n)-bit digital video signal that is converted from the k-bit digital video signal;
- causing each of the j display periods to correspond to one of q gray scale information included in a (k−n)-bit digital video signal (where q is a natural number);
- and
- turning on the pixels that perform display of the q-th gray scale information for at least one display period in addition to all of the turn-on display periods for displaying the (q−1)-th gray scale information.
A light emitting device comprising:
- a plurality of pixels each having a light emitting element and a thin film transistor:
- a signal line driver circuit;
- a scanning line driver circuit;
- and
- an image processing circuit having at least one of an error diffusion circuit and a dither circuit,
- wherein the image processing circuit is adapted to:
- set j display periods (where j is a natural number) in one frame period;
- subject lower n bits of a k-bit digital video signal (where n is a natural number, j≧(k−n) to one or both of the error diffusion circuit and the dither circuit to thereby select whether the pixels turn on or turn off in each of the j display periods according to a (k−n)-bit digital video signal that is converted from the k-bit digital video signal;
- wherein the plurality of pixels is adapted to perform display of q-th gray scale information and is turned on for at least one display period in addition to all of turn-on display periods for displaying (q−1)-th gray scale information (where q is a natural number).
A method of driving a light emitting device in which a plurality of pixels having a light emitting element are formed, the method comprising:
- setting j display periods (where j is a natural number) in one frame period;
- subjecting lower n bits of a k-bit digital video signal (where n is a natural number, j≧k−n) to one or both of dither processing and error diffusion processing to thereby select whether the pixels turn on or turn off in each of the j display periods according to a (k−n)-bit digital video signal that is converted from the k-bit digital video signal;
- and
- turning on the pixels that perform display of the q-th gray scale information for at least one display period in addition to all of the turn-on display periods for displaying the (q−1)-th gray scale information (where q is a natural number).
A light emitting device comprising:
- a plurality of pixels each having a light emitting element and a thin film transistor;
- a signal line driver circuit;
- a scanning line driver circuit;
- and
- an image processing circuit having at least one of an error diffusion circuit and a dither circuit;
- wherein the image processing circuit is adapted to:
- set j display periods (where j is a natural number) in one frame period;
- subject lower n bits of a k-bit digital video signal (where n is a natural number, j≧k−n) to one or both of the error diffusion circuit and the dither circuit to thereby select whether the pixels turn on or turn off in each of the j display periods according to a (k−n)-bit digital video signal that is converted from the k-bit digital video signal;
- and
- cause each of the j display periods to correspond to one of q gray scale information included in a (k−n)-bit digital video signal (where q is a natural number);
- and
- wherein the plurality of pixels is adapted to perform display of q-th gray scale information and is turned on for at least one display period in addition to all of turn-on display periods for displaying (q−1)-th gray scale information (where q is a natural number).
Dependencies are inferred from the claim text.