Display device and output buffer circuit for driving the same

An organic EL display device, comprising:

• a plurality of driving circuits;
• a first output line connected to at least one of the plurality of driving circuits;
• and
• an output circuit including:
• a high potential line connected through a first signal path to the first output line;
• a low potential line connected through a second signal path to the first output line;
• and
• a variable resistance circuit connected between the high potential line and the first output line,
• wherein:
• the high potential line is applied a first voltage;
• the low potential line is applied a second voltage lower than the first voltage;
• the output circuit is configured to supply an output signal to at least one of the plurality of driving circuits;
• and
• the variable resistance circuit comprises a transistor with a control terminal thereof coupled to a current terminal thereof;
• the transistor is directly electrically connected to the first output line;
• and
• the plurality of driving circuits is a plurality of pixel circuits;
• and
• wherein the plurality of pixel circuits are arranged in rows and columns and the first output line is one of a plurality of first output lines that are connected to corresponding rows of the plurality of pixel circuits, the display device further comprising:
• data lines connected to corresponding columns of the plurality of pixel circuits;
• scanning lines connected to corresponding rows of the plurality of pixel circuits;
• a data control circuit for supplying data signals to the data lines;
• and
• a scanning control circuit for supplying control signals to the scanning lines,
• wherein each of the plurality of pixel circuits further comprises first and second transistors, and a hold capacitor configured such that:
• the first transistor causes the hold capacitor to hold therein a potential of the data signal from the data line connected to the pixel circuit in accordance with the control signal from the scanning line connected to the pixel circuit,
• when the output signal from the first output line that is connected to the pixel circuit is supplied to the second transistor, the second transistor supplies a drive current from the first output line to the light emitting element in accordance with the potential of the data signal held in the hold capacitor, and
• the light emitting element emits a light in accordance with the drive current.

An organic EL display device, comprising:

• a plurality of driving circuits;
• a first output line connected to at least one of the plurality of driving circuits;
• and
• an output circuit including:
• a high potential line connected through a first signal path to the first output line;
• a low potential line connected through a second signal path to the first output line;
• and
• a variable resistance circuit connected between the high potential line and the first output line,
• wherein:
• the high potential line is applied a first voltage;
• the low potential line is applied a second voltage lower than the first voltage;
• and
• the variable resistance circuit comprises a transistor with a control terminal thereof coupled to a current terminal thereof;
• and
• the transistor is directly electrically connected to the first output line;
• and
• the plurality of driving circuits is a plurality of pixel circuits, and
• wherein the plurality of pixel circuits are arranged in rows and columns and the first output line is one of a plurality of first output lines that are connected to corresponding rows of the plurality of pixel circuits, the display device further comprising:
• data lines connected to corresponding columns of the plurality of pixel circuits;
• scanning lines connected to corresponding rows of the plurality of pixel circuits;
• a data control circuit for supplying data signals to the data lines;
• and
• a scanning control circuit for supplying control signals to the scanning lines,
• wherein each of the plurality of pixel circuits further comprises first and second transistors, and a hold capacitor configured such that:
• the first transistor causes the hold capacitor to hold therein a potential of the data signal from the data line connected to the pixel circuit in accordance with the control signal from the scanning line connected to the pixel circuit,
• when the output signal from the first output line that is connected to the pixel circuit is supplied to the second transistor, the second transistor supplies a drive current from the first output line to the light emitting element in accordance with the potential of the data signal held in the hold capacitor, and
• light emitting element emits a light in accordance with the drive current.

An organic EL display device, comprising:

• a plurality of pixel circuits arranged in rows and columns;
• data lines connected to corresponding columns of the plurality of pixel circuits;
• output lines connected to corresponding rows of the plurality of pixel circuits;
• scanning lines connected to corresponding rows of the plurality of pixel circuits;
• a scanning control circuit configured to supply control signals to the scanning lines;
• and
• an output circuit configured to supply output signals to the output lines, the output circuit including:
• a high potential line connected through a first signal path to the first output line;
• a low potential line connected through a second signal path to the first output line;
• and
• a variable resistance circuit connected between the high potential line and the first output line,
• wherein:
• the high potential line is applied a first voltage;
• the low potential line is applied a second voltage lower than the first voltage;
• the variable resistance circuit comprises a transistor with a control terminal thereof coupled to a current terminal thereof;
• the transistor is directly electrically connected to the first output line;
• each of the plurality of pixel circuits comprises a first transistor, a second transistor, and a hold capacitor;
• the first transistor is configured to supply a data signal in accordance with the control signal from the scanning line connected to the pixel circuit;
• the second transistor is configured to supply a drive current in accordance with the output signal from the output line connected to the pixel circuit;
• the hold capacitor is configured to hold a potential corresponding to the data signal;
• the drive current is configured to be flowed to the light emitting element in accordance with the potential held in the hold capacitor;
• and
• the light emitting element is configured to emit light in accordance with the drive current.