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US 7,742,064 B2Granted
Signal line driver circuit, light emitting device and driving method thereof
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorHajime Kimura
Life of this patent
Estimating the term…
Abstract
Variation occurs in transistor characteristics. The present invention relates to a signal line driver circuit comprising a plurality of current source circuits respectively corresponding to a plurality of wirings, characterized in that: the plurality of current source circuits each comprise capacitor means and supply means; and the plurality of current source circuits each convert a supplied current into a voltage in accordance with a video signal, and supply a current corresponding to the converted voltage.
Claims33
A signal line driver circuit comprising:
- a constant current circuit, the constant current circuit including a plurality of current source circuits corresponding to a plurality of wirings;
- a shift register, the shift register including a plurality of flip-flop circuits, each of the plurality of flip-flop circuits being disposed for each of the plurality of wirings;
- a first latch circuit, the first latch circuit being electrically connected to the shift register;
- and
- a second latch circuit, the second latch circuit being electrically connected to the first latch circuit and the constant current circuit,
- wherein,
- the plurality of current source circuits each comprises capacitor means and supply means;
- and
- the plurality of current source circuits each converts a supplied current to a voltage in accordance with a setting signal, and supplies a current corresponding to the converted voltage;
- the current is supplied to a pixel portion comprising a plurality of pixels, and
- the plurality of pixels each includes a thin film transistor, a capacitor and a light emitting element.
8 more elements
A signal line driver circuit comprising:
- a constant current circuit, the constant current circuit including a plurality of current source circuits corresponding to a plurality of wirings;
- a shift register, the shift register including a plurality of flip-flop circuits, each of the plurality of flip-flop circuits being disposed for each of the plurality of wirings;
- a first latch circuit, the first latch circuit being electrically connected to the shift register;
- and
- a second latch circuit, the second latch circuit being electrically connected to the first latch circuit and the constant current circuit,
- wherein,
- n current source circuits (n is a natural number equal to or larger than 2) each comprising capacitor means and supply means are disposed for each wiring;
- the n current source circuits each converts a supplied current to a voltage in accordance with a setting signal, and supplies a current corresponding to the converted voltage;
- the current is supplied to a pixel portion comprising a plurality of pixels, and
- the plurality of pixels each includes a thin film transistor, a capacitor and a light emitting element.
7 more elements
A signal line driver circuit comprising:
- a constant current circuit, the constant current circuit including a plurality of current source circuits corresponding to a plurality of wirings;
- a shift register, the shift register including a plurality of flip-flop circuits, each of the plurality of flip-flop circuits being disposed for each of the plurality of wirings;
- a first latch circuit, the first latch circuit being electrically connected to the shift register;
- and
- a second latch circuit, the second latch circuit being electrically connected to the first latch circuit and the constant current circuit,
- wherein,
- the plurality of current source circuits each converts a supplied current to a voltage in accordance with a setting signal, and supply a current corresponding to the converted voltage;
- the current is supplied to a pixel portion comprising a plurality of pixels, and
- the plurality of pixels each includes a thin film transistor, a capacitor and a light emitting element.
6 more elements
A signal line driver circuit comprising:
- a constant current circuit, the constant current circuit including a plurality of current source circuits corresponding to a plurality of wirings;
- a shift register, the shift register including a plurality of flip-flop circuits, each of the plurality of flip-flop circuits being disposed for each of the plurality of wirings;
- a first latch circuit, the first latch circuit being electrically connected to the shift register;
- and
- a second latch circuit, the second latch circuit being electrically connected to the first latch circuit and the constant current circuit,
- wherein,
- n current source circuits each converts a supplied current to a voltage in accordance with a setting signal, and supplies a current corresponding to the converted voltage (n is a natural number equal to or larger than 2);
- the current is supplied to a pixel portion comprising a plurality of pixels, and
- the plurality of pixels each includes a thin film transistor, a capacitor and a light emitting element.
6 more elements
Dependencies are inferred from the claim text.