Current Source Circuit, A Signal Line Driver Circuit and a Driving Method Thereof and a Light Emitting Device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsHajime Kimura, Jun Koyama
Life of this patent
Estimating the term…
Abstract
A current source circuit includes current sources that are each configured to receive an external set signal and to control an output current value based on the external set signal. A changing over circuit that is electrically connected to the current sources and a set of output lines selects one of the current sources to be electrically connected to each of the output lines.
Claims11
A current source circuit characterized in by comprising a plurality of current sources which can control an output current value by a set signal inputted from outside,
- wherein a changing over means which can change over an electrical connection between an output line and the plurality of current sources is provided between the output line and the plurality of current sources.
A current source circuit characterized in by comprising a plurality of pairs of current sources which can control an output current value by a set signal inputted from outside,
- wherein a changing over means which can change over an electrical connection between an output line and a plurality of current sources is provided between the output line and the plurality of pairs of current sources.
A signal line driver circuit characterized in by comprising a plurality of current sources which can control an output current value by a set signal inputted from outside, a shift resistor, a first latch circuit, and a second latch circuit,
- wherein a changing over means which can change over an electrical connection between a signal line and the plurality of current sources is provided between the signal line and the plurality of current sources, and
- wherein the set signal is set according to the shift register.
A signal line driver circuit characterized in by comprising a plurality of current sources which can control an output current value by a set signal inputted from outside, a shift resistor, a first latch circuit, a second latch circuit, and switches provided in the plurality of current sources,
- wherein a changing over means which can change over an electrical connection between a signal line and the plurality of current sources is provided between the signal line and the plurality of current sources,
- wherein the set signal is set according to the shift register, and
- the switches are controlled by a signal from the second latch circuit.
A signal line driver circuit characterized in by comprising a plurality of current sources which can control an output current value by a set signal inputted from outside, a shift resistor, a first latch circuit, a second latch circuit, and switches provided in the plurality of current sources,
- wherein a changing over means which can change over an electrical connection between a signal line and the plurality of current sources is provided between the signal line and the plurality of current sources, and
- wherein the set signal is set according to the second latch circuit.
A signal line driver circuit characterized in by comprising a plurality of current sources which can control an output current value by a set signal inputted from outside, a shift resistor, a first latch circuit, a second latch circuit, and switches provided in the plurality of current sources,
- wherein a changing over means which can change over an electrical connection between a signal line and the plurality of current sources is provided between the signal line and the plurality of current sources,
- wherein the set signal is set according to the second latch circuit, and
- wherein the switches are controlled by a signal from the second latch circuit.
A signal line driver circuit characterized in by comprising a plurality of current sources which can control an output current value by a set signal inputted from outside, a first shift register, a second shift register, a first latch circuit, and a second latch circuit,
- wherein a changing over means which can change over an electrical connection between a signal line and the plurality of current sources is provided between the signal line and the plurality of current sources, and
- wherein the set signal is set according to the first shift register.
A signal line driver circuit characterized in by comprising a plurality of current sources which can control an output current value by a set signal inputted from outside, a first shift register, a second shift register, a first latch circuit, a second latch circuit, and switches provided in the plurality of current sources,
- wherein a changing over means which can change over an electrical connection between a signal line and the plurality of current sources is provided between the signal line and
- the plurality of current sources,
- wherein the set signal is set according to the first shift register, and
- wherein the switches are controlled by a signal from the second latch circuit.
A signal line driver circuit characterized in by comprising a plurality of first and second current sources which can control an output current value by a set signal inputted from outside, a shift register, a first latch circuit comprising the first current source, and a second latch circuit comprising the second current source,
- wherein a changing over means which can change over an electrical connection between a signal line and the plurality of first and second current sources is provided between the
- signal line and the plurality of first and second current sources,
- wherein a set signal inputted to the first current source is set according to from the shift register, and
- wherein a set signal inputted to the second current source is set according to a current
- set in the first current source.
A signal line driver circuit characterized in by comprising a plurality of first and second current sources which can control an output current value by a set signal inputted from outside, a shift register, a first latch circuit comprising the first current source, a second latch circuit comprising the second current source, a first switch provided between the first latch circuit, and the second latch circuit and a second switch provided between the second latch circuit and the changing over means,
- wherein a changing over means which can change over an electrical connection between a signal line and the plurality of first and second current sources is provided between the signal line and the plurality of first and second current sources,
- wherein a set signal inputted to the first current source is set according to from the shift register,
- wherein a set signal inputted to the second current source is set according to a current set in the first current source, and
- wherein the first and the second switches are controlled by a signal from the second latch circuit.
A driving method of a signal line driver circuit characterized in by comprising a current source circuit comprising a plurality of current sources, a means for setting a current of the plurality of current sources, a plurality of signal lines through which the set current flows, and a changing over means provided between the signal line and the current source,
- wherein the changing over means changes over a connection of the signal line and the current source circuit in each certain period.
Dependencies are inferred from the claim text.